CN110650224B

Movatterモバイル変換

Info

Publication number: CN110650224B
Application number: CN201910844668.7A
Authority: CN
Inventors: 林峰; 王小明
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Fushi Technology Co.,Ltd.
Priority date: 2019-09-05
Filing date: 2019-09-06
Publication date: 2021-08-27
Anticipated expiration: 2039-09-06
Also published as: CN110650224A

Abstract

Translated fromChinese

本申请提供了一种屏下感测装置，包括：显示模组，包括显示面板与背光模组，显示面板包括多个像素，背光模组包括背光光源；显示驱动电路，用于驱动显示面板的像素显示图像；接收模组，用于接收由外部对象返回的检测光束，并转换所述检测光束为相应的电信号；指示光源，位于背光模组的下方；指示光源驱动电路，用于驱动指示光源工作；检测单元，用于执行感测操作；控制单元，与所述检测单元、显示驱动电路、指示光源驱动电路、及接收模组连接。当所述背光光源关闭后，根据所述检测单元的感测结果，所述控制单元控制所述指示光源是否工作，以及控制所述显示面板的部分像素是否显示预设图案。此外，本申请还提供一种具有上述屏下感测装置的电子设备。

The present application provides an under-screen sensing device, including: a display module, including a display panel and a backlight module, the display panel includes a plurality of pixels, and the backlight module includes a backlight light source; a display driving circuit for driving the display panel The pixel displays an image; the receiving module is used to receive the detection beam returned by the external object, and convert the detection beam into a corresponding electrical signal; the indicator light source is located below the backlight module; the indicator light source driving circuit is used to drive the indicator The light source works; the detection unit is used for performing sensing operation; the control unit is connected with the detection unit, the display driving circuit, the indicating light source driving circuit, and the receiving module. After the backlight light source is turned off, according to the sensing result of the detection unit, the control unit controls whether the indicating light source works and whether some pixels of the display panel display a preset pattern. In addition, the present application also provides an electronic device having the above-mentioned under-screen sensing device.

Description

Sensing device and electronic equipment under screen

Technical Field

The application belongs to the technical field of sensing, and particularly relates to a sensing device under a screen and an electronic device.

Background

With the continuous development of the technology of the intelligent terminal (for example, a mobile phone, etc.), a full screen has become a development trend, and in order to meet the increasing screen occupation ratio, more and more sensing modules originally arranged on the front side of the mobile phone are hidden below or inside the screen.

However, some sensing modules, for example fingerprint sensing module etc. need interact with the user and realize the sensing function, but when fingerprint sensing module set up in screen below or inside the screen, the unable accurate perception fingerprint detection area of user, consequently causes adverse effect for user's fingerprint identification operation and system identification efficiency.

Disclosure of Invention

The application provides a sensing device and an electronic device under a screen to solve the technical problem.

The application provides sensing device under screen includes:

the display device comprises a display module and a backlight module, wherein the display module comprises a display panel and the backlight module which are arranged in a stacked mode, the backlight module is used for providing visible light beams for the display panel to realize image display, the display panel comprises a plurality of pixels, the backlight module comprises a backlight source, and the backlight source is used for emitting the visible light beams;

the display driving circuit is used for driving a plurality of pixels of the display panel to display corresponding images;

the receiving module is used for receiving the detection light beam returned by the external object and converting the detection light beam into a corresponding electric signal to obtain the biological characteristic information of the external object;

the indicating light source is positioned below the backlight module and used for emitting visible light beams to the display panel through the backlight module;

the indicating light source driving circuit is used for driving the indicating light source to work;

a detection unit for performing a sensing operation; and

the control unit is respectively connected with the detection unit, the display driving circuit, the indication light source driving circuit and the receiving module;

when the backlight source is turned off, the control unit controls the indicating light source driving circuit to drive the indicating light source to work or not according to the sensing result of the detection unit, and controls the display driving circuit to drive partial pixels of the display panel to display a preset pattern so as to indicate an effective sensing area of the receiving module on the display module.

In some embodiments, after the backlight light source is turned off, when the detection unit senses a trigger operation of a user, the control unit controls the indication light source driving circuit to drive the indication light source to emit a visible light beam, and controls the display driving circuit to drive a part of pixels of the display panel to display the preset pattern.

In some embodiments, after the display module displays the preset pattern, the detection unit further senses whether a touch or press operation exists on the effective sensing area, and after the detection unit senses that the touch or press operation exists on the effective sensing area, the control unit controls the receiving module to start to perform the sensing of the biometric information.

In some embodiments, when the detection unit senses a trigger operation of a user, the control unit controls the indication light source driving circuit to drive the indication light source to emit a visible light beam and controls the display driving circuit to drive a part of pixels of the display panel to display the preset pattern, and the control unit further controls the receiving module to perform pre-start with a first power consumption.

In some embodiments, when the detection unit senses a trigger operation of a user, and the control unit controls the indication light source driving circuit to drive the indication light source to emit a visible light beam and controls the display driving circuit to drive a part of pixels of the display panel to display the preset pattern, the receiving module does not operate.

In some embodiments, after the detection unit senses that the sensing area is touched or pressed, the control unit controls the receiving module to start to perform sensing of biometric information with a second power consumption, wherein the first power consumption is smaller than the second power consumption.

In some embodiments, the under-screen sensing device further comprises an emission module configured to emit a detection beam to an external object.

In some embodiments, when the detection unit senses a trigger operation of a user, and the control unit controls the indication light source driving circuit to drive the indication light source to emit a visible light beam and controls the display driving circuit to drive a part of pixels of the display panel to display the preset pattern, the emission module does not operate.

In some embodiments, after the detection unit senses that the effective sensing area is touched or pressed, the control unit controls the emission module to start emitting the detection beam to an external object.

In some embodiments, the brightness of the preset pattern displayed by the display module when the receiving module operates with the first power consumption is less than the brightness of the preset pattern displayed by the display module when the receiving module operates with the second power consumption, or/and the preset pattern displayed by the display module when the receiving module operates with the first power consumption may be different from the preset pattern displayed by the display module when the receiving module operates with the second power consumption.

In some embodiments, the brightness of the visible light beam provided to the display panel by the indication light source when the receiving module operates at the first power consumption is less than the brightness of the visible light beam provided to the display panel by the indication light source when the receiving module operates at the second power consumption.

In some embodiments, the brightness of the preset pattern displayed by the display module when the indication light source is turned on but the receiving module does not operate is less than the brightness of the preset pattern displayed by the display module when the indication light source is turned on and the receiving module operates, or/and the preset pattern displayed by the display module when the indication light source is turned on but the receiving module does not operate may be different from the preset pattern displayed by the display module when the indication light source is turned on and the receiving module operates.

In some embodiments, the brightness of the visible light beam provided to the display panel by the indication light source when the receiving module is not operated is less than the brightness of the visible light beam provided to the display panel by the indication light source when the receiving module is operated.

In some embodiments, the detection unit includes a touch screen, the user's trigger operation is a touch operation, and the touch screen is configured to sense whether there is a touch operation on the display module after the backlight light source is turned off; or/and the detection unit comprises an acceleration sensor, the triggering operation of the user is to lift the off-screen sensing device, and the acceleration sensor is used for sensing whether the off-screen sensing device has a lifted operation after the backlight light source is turned off; or/and the detection unit comprises a pressure sensor, the triggering operation of the user is a pressing operation, and the pressure sensor is used for sensing whether the pressing operation exists on the display module after the backlight light source is turned off.

In some embodiments, the backlight module is a side-in type backlight module.

In some embodiments, the backlight module further comprises:

the backlight source is positioned on one side of the light incoming surface and used for emitting visible light beams to the inside of the light guide plate through the light incoming surface, and the visible light beams are emitted to the display panel from the light outgoing surface;

a reflection sheet disposed at one side of the bottom surface for reflecting the visible light beam leaked from the bottom surface back to the inside of the light guide plate; and

and the diffusion sheet is arranged between the light-emitting surface and the display panel and is used for diffusing the visible light beams emitted from the light-emitting surface.

In some embodiments, the transmittance of the reflective sheet for visible light beams is less than 10% and greater than 0, or the transmittance of the reflective sheet for visible light beams is less than 5% and greater than 0.3%, or the transmittance of the reflective sheet for visible light beams is less than 5% and greater than 0.5%, or the transmittance of the reflective sheet for visible light beams is less than 3% and greater than 0.6%.

In some embodiments, the detection beam is near infrared light, and the transmittance of the reflective sheet to the detection beam is greater than 70%.

In some embodiments, when the backlight source is turned off and the receiving module is in operation, the visible light beam emitted by the indicating light source sequentially passes through the reflective sheet and the light guide plate and is transmitted to the diffusion sheet, and after being diffused by the diffusion sheet, the visible light beam is transmitted to the display panel to provide the visible light beam for the display panel to display the preset pattern.

In some embodiments, the backlight module further includes a bottom plate, the bottom plate is located below the reflector plate, a through hole is formed in a position of the bottom plate facing the indication light source and the receiving module, the indication light source emits a visible light beam to the reflector plate through the through hole, and the receiving module receives a detection light beam emitted from the reflector plate through the through hole.

In some embodiments, the reflective sheet comprises a plurality of layers of polymers that do not have the same refractive index for the detection beam and the visible beam, wherein the wavelength of the detection beam is different from the wavelength of the visible beam.

In some embodiments, the receiving module is located below the backlight module, and is configured to receive the detection light beam returned by the external object through the display module, and convert the received detection light beam into a corresponding electrical signal.

In some embodiments, the indication light source is a plurality of light sources, and is disposed around the receiving module.

In some embodiments, the off-screen sensing device further includes a middle frame, the middle frame includes a bottom portion and a side portion, the bottom portion is located below the backlight module, the side portion is located beside the backlight module and the display panel, and the receiving module and/or the indication light source are fixed on the bottom portion of the middle frame.

In some embodiments, the detection beam returned by the external object comprises a detection beam transmitted or/and reflected by the external object.

In some embodiments, the display panel is a liquid crystal display panel, and the receiving module is configured to perform fingerprint sensing.

In some embodiments, the off-screen sensing device is applied to an electronic device, the display module includes an upper surface, the upper surface is an outer surface of the electronic device, and the effective sensing area of the receiving module on the outer surface is directly opposite to a part of pixels displaying the preset pattern.

In some embodiments, the indicator light source is turned off when the backlight light source is turned on.

In some embodiments, the indication light source is located under a local area of the backlight module, and when the indication light source is turned on, a visible light beam emitted by the indication light source passes through the backlight module and then irradiates at least right under a part of pixels displaying the preset pattern.

In some embodiments, the total power of the indicator light source is less than the total power of the backlight light source.

In some embodiments, the total power of the indicator light source is less than half of the total power of the backlight light source.

In some embodiments, the reflective sheet is provided with one or more through holes on an irradiation area of the indication light source, or the reflective sheet is not provided with through holes on the irradiation area of the indication light source.

In some embodiments, the reflective sheet has a transmittance of 0.55%, 0.6%, or 1% for visible light beams, a reflectance of greater than 90% and less than 100% for visible light beams, and a transmittance of greater than 70% for detection light beams.

The application also provides an electronic device comprising the under-screen sensing device as described in any of the above.

According to the technical scheme, the indicating light source is arranged below the backlight module, when the backlight light source is closed, the indicating light source can replace the backlight light source to emit the visible light beams, the visible light beams emitted by the indicating light source are provided for the display panel after the backlight module is subjected to homogenization and other treatments, and therefore partial pixels of the display panel can display preset patterns to indicate that the receiving module is in an effective sensing area on the display module.

Since the total power of the indication light source is less than the total power of the backlight light source, power consumption can be saved. In addition, the indicating light source and the backlight light source are two independent groups of light sources, so when the indicating light source is damaged, the indicating light source is easy to replace.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

Fig. 1 is a schematic front view of an electronic device according to the present application when performing fingerprint sensing.

Fig. 2 is a schematic partial cross-sectional view of a first embodiment of an under-screen sensing device of an electronic device according to the present application.

Fig. 3 is a partial block diagram of a first embodiment of an off-screen sensing device of an electronic device according to the present application.

Fig. 4 is a partial block diagram of a second embodiment of an off-screen sensing device of an electronic device according to the present application.

Fig. 5 is a schematic partial cross-sectional view of a third embodiment of an under-screen sensing device of an electronic device according to the present application.

Fig. 6 is a partial block diagram of a structure of an under-screen sensing device according to a third embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "first", "second" and "third" are used for the sake of clarity and conciseness of description only and are not to be construed as indicating or implying relative importance or implicitly indicating the number or order of arrangement of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either mechanically or electrically or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship or combination of two or more elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the present application, only the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repeat use is intended to provide a simplified and clear description of the present application and is not intended to suggest any particular relationship between the various embodiments and/or arrangements discussed. In addition, the various specific processes and materials provided in the following description of the present application are only examples of implementing the technical solutions of the present application, but one of ordinary skill in the art should recognize that the technical solutions of the present application can also be implemented by other processes and/or other materials not described below.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

It should be noted in advance that the technical solution of the present application is mainly applicable to an off-screen sensing device having a passive light emitting display device. The passive light emitting display device itself cannot emit light, and it needs an additional light source to provide a visible light beam for the passive light emitting display device to realize image display, where the additional light source is, for example, a backlight module disposed below the passive light emitting display device, and the passive light emitting display device is, for example and without limitation, a Liquid Crystal Display (LCD).

In the embodiment of the present application, the electronic device having the under-screen sensing device includes, for example and without limitation, a screen-off state and a screen-on state. The screen-off state refers to a state in which light sources providing visible light beams for the passive light-emitting display device in the electronic device are all in an off state, so that the passive light-emitting display device cannot display a picture, for example, the screen-off state may be a standby state, and at this time, some functional modules inside the electronic device may be in a sleep mode. The bright screen state refers to a state in which a part or all of light sources in the electronic device that provide visible light beams for the passive light emitting display device are turned on and the passive light emitting display device currently displays a picture.

The bright screen state may include a bright screen to-be-unlocked state and a bright screen unlocked state. The bright screen to-be-unlocked state refers to that the electronic equipment displays a picture at present but is in a locked state, and a user can perform touch input operation only after unlocking the electronic equipment. The bright screen unlocking state means that the electronic equipment is unlocked and enters a normal working state, and a user can directly perform touch input operation.

Referring to fig. 1, fig. 1 is a schematic front view of an electronic device for performing fingerprint sensing according to the present application. The electronic device 1 is, for example, but not limited to, a suitable type of electronic product such as a consumer electronic product, a home-based electronic product, a vehicle-mounted electronic product, a financial terminal product, and the like. The consumer electronic products include, for example, mobile phones, tablet computers, notebook computers, desktop monitors, all-in-one computers, and the like. Household electronic products are, for example, smart door locks, televisions, refrigerators and the like. The vehicle-mounted electronic product is, for example, a vehicle-mounted navigator, a vehicle-mounted DVD, or the like. The financial terminal products are ATM machines, terminals for self-service business and the like.

The electronic device 1 comprises an off-screen sensing means. The under-screen sensing device is used for sensing the biological characteristic information of an external object. The biometric information of the external object is, for example, but not limited to: fingerprint information of fingers, palm print information of palms, blood oxygen information of human bodies, heartbeat information, pulse information and the like. Such as, but not limited to, an optical underscreen sensing device, an ultrasonic underscreen sensing device, an electric field underscreen sensing device, or other suitable type of underscreen sensing device. In the present application, the description is made taking the example that the under-screen sensing device is preferably an optical under-screen sensing device.

The electronic device 1 further comprises, for example, a processor (not shown). The processor is used for comparing the biological characteristic information obtained by the under-screen sensing device with a pre-stored biological characteristic information template so as to authenticate the identity of the user. If the identity authentication is passed, the electronic device 1 performs the corresponding function. Such as, but not limited to, performing an unlock, a payment, or launching a preset application, etc. However, if the identity authentication fails, the electronic device 1 does not perform these functions. The off-screen sensing device can also be used for acquiring body function parameters such as heart rate and/or blood oxygen content of the user, and accordingly, the processor judges whether the external object is a living body or not according to the body function parameters, or/and judges emotion, health condition and the like of the user.

However, alternatively, in certain other embodiments, some or all of the processor may also be disposed in the underscreen sensing device.

Referring to fig. 2 and fig. 3 together, fig. 2 is a partial cross-sectional view of a first embodiment of an under-screen sensing device of an electronic apparatus 1 according to the present application. Fig. 3 is a partial block diagram of the first embodiment of the off-screen sensing device of the electronic device 1 according to the present application. The under-screen sensing device 10 includes adisplay module 11, a receivingmodule 13, a display driving circuit 15, and a backlightsource driving circuit 16. Thedisplay module 11 includes a display panel 111 and abacklight module 112 stacked on the display panel 111. Thebacklight module 112 is configured to provide a visible light beam for the display panel 111 to display an image. The display panel 111 is a passive light emitting display device, such as, but not limited to, a liquid crystal display panel. Thebacklight module 112 is a side-in type backlight module.

The display panel 111 is connected to the display driving circuit 15, and the display driving circuit 15 is configured to drive the display panel 111 to display an image. The display panel 111 includes a plurality of pixels P, and the display driving circuit 15 adjusts a display gray scale of the pixels P by adjusting a voltage applied to the pixels P.

Thebacklight module 112 includes abacklight source 113 and anoptical film set 114. Thebacklight source 113 is located at one side of theoptical film set 114. Theoptical film set 114 is used for converting the visible light beam emitted by thebacklight light source 113 into a uniform surface light source, and providing the uniform surface light source below the display panel 111. Alternatively, in some embodiments, thebacklight sources 113 may be disposed on different sides of theoptical film set 114.

The backlight lightsource driving circuit 16 is connected to thebacklight light source 113, and is configured to drive thebacklight light source 113 to emit a visible light beam.

The receivingmodule 13 is disposed below thebacklight module 112, and is configured to receive the detection light beam returned by the external object through thedisplay module 11, convert the detection light beam into a corresponding electrical signal, and obtain the biometric information of the external object according to the electrical signal. Wherein the wavelength of the detection beam is different from the wavelength of the visible beam.

In the present application, the receivingmodule 13 is described as an optical receiving module, but the receivingmodule 13 may be other suitable type of module, such as an ultrasonic detecting module, in other embodiments. In addition, the biometric information of the external object obtained from the electrical signal may also be obtained by a processor, and the biometric information is not limited to be obtained by the receivingmodule 13.

Thedisplay module 11 includes an upper surface, which is anouter surface 1190 of the electronic device 1. The electronic device 1 interacts with a user through theouter surface 1190, receives input operations of the user, and the like. The area of thedisplay module 11 on theouter surface 1190 where the image is displayed is defined as a display area (not shown), and the area around the display area where the image cannot be displayed is defined as a non-display area (not shown).

The receivingmodule 13 has a field angle, and an area of theouter surface 1190 of the electronic device 1 within the field angle of the receivingmodule 13 is defined as an effective sensing area D. When the receivingmodule 13 performs biometric information sensing, it senses biometric information of an external object contacting on the effective sensing area D. The effective sensing area D is a local area in the display area of thedisplay module 11.

Optionally, thedisplay module 11 further includes a protective cover 110. The protective cover plate 110 is located on a side of the display panel 111 opposite to thebacklight module 112. The protective cover 110 is used to protect the display panel 111 and other elements. The protective cover 110 includes an upper surface and a lower surface disposed opposite to each other. The upper surface of the protective cover 110 is the upper surface of thedisplay module 11 and is also anouter surface 1190 of the electronic device 1. The display panel 111 is disposed on a lower surface side of the protective cover 110. The protective cover sheet 110 may be a multi-layered structure including, for example, a screen protective film to which a user sticks.

In this embodiment, thebacklight source 113 in thebacklight module 112 is the only light source in the electronic device 1 for providing the display panel 111 with visible light beams. Accordingly, when thebacklight source 113 of thebacklight module 112 is turned off, the electronic device 1 having thedisplay module 11 is in a screen-off state. At this time, the display area of thedisplay module 11 is black.

Optionally, the under-screen sensing device further comprises a detection unit 17 and acontrol unit 18. Thecontrol unit 18 is connected to the detection unit 17, the display driving circuit 15, the backlightsource driving circuit 16, and the receivingmodule 13. The detecting unit 17 is configured to detect whether there is a preset trigger operation of the user on the electronic device 1 when the electronic device 1 is in a screen-off state, and after the detecting unit 17 detects the preset trigger operation of the user, thecontrol unit 18 controls the backlightsource driving circuit 16 to drive thebacklight source 113 to be turned on, controls the display driving circuit 15 to drive a part of pixels P of the display panel 111 to display a preset pattern to mark a position of the effective sensing area D, and controls the receivingmodule 13 to start to perform biometric information sensing. Wherein the preset pattern is, for example but not limited to, a fingerprint pattern. The preset pattern is displayed at the position of the effective sensing area D, for example, but not limited thereto. Accordingly, the user can determine the position of the effective sensing region D, thereby facilitating the biometric recognition operation of the user and, in addition, improving the recognition efficiency of the off-screen sensing apparatus 10.

Optionally, the detecting unit 17 includes a touch screen, the preset triggering operation is a touch operation, and the touch screen is configured to detect whether there is a touch operation when thebacklight light source 113 is turned off; or/and the detecting unit 17 comprises an acceleration sensor, the preset triggering operation is to lift the off-screen sensing device 10, and the acceleration sensor is used for detecting whether the off-screen sensing device 10 has a lifted operation when thebacklight light source 113 is turned off; or/and the detection unit 17 includes a pressure sensor, the preset trigger operation is a pressing operation, and the pressure sensor is used for detecting whether the pressing operation exists when thebacklight light source 113 is turned off.

Optionally, the touch screen is disposed above the display panel 111, or the touch screen is integrated In the display panel 111, including but not limited to an On-cell or In-cell integration manner.

Optionally, the pressure sensor is disposed between the display panel 111 and thebacklight module 112, and is configured to sense a pressing operation of a user. However, the pressure sensor may be omitted in some embodiments, as a variant.

In the above embodiment, the receivingmodule 13 does not perform biometric information sensing during the screen-off state of the electronic device 1. Alternatively, in some variations, the receivingmodule 13 may also perform the biometric information sensing during the screen-off state of the electronic device 1. Thus, the off-screen sensing device 10 consumes relatively much power.

Alternatively, the pixel P includes, for example but not limited to, a switch T, a pixel electrode E connected to the switch T, and a common electrode C. The switching-on light T is also used for connection with the display driving circuit 15. The pixel electrode E and the common electrode C are used for forming an electric field. The display driving circuit 15 is configured to provide a pixel voltage to the pixel electrode E through the switch T and provide a common voltage to the common electrode C. In the present embodiment, for a pixel P: when the clamping voltage between the pixel electrode E and the common electrode C is 0V, the pixel P is in an off state, and the visible light beams are prevented from passing through. When the absolute value of the voltage between the pixel electrode E and the common electrode C is larger, the transmittance of the pixel P to a visible light beam is higher. However, alternatively, in some other embodiments, the transmittance of the pixel P for the visible light beam may also become smaller as the absolute value of the clamping pressure between the pixel electrode E and the common electrode C is larger.

Optionally, theoptical film set 114 includes areflective sheet 115, alight guide plate 116 positioned above thereflective sheet 115, a diffusion sheet 117 positioned above thelight guide plate 116, and a brightness enhancement sheet 118 positioned above the diffusion sheet 117.

Thelight guide plate 116 includes a light emitting surface 1161 and abottom surface 1162 which are oppositely disposed, and alight incident surface 1163 connected between the light emitting surface 1161 and thebottom surface 1162. The light emitting surface 1161 faces the diffusion sheet 117. Thebottom surface 1162 faces thereflective sheet 115. Thebacklight light source 113 is disposed adjacent to thelight incident surface 1163. Thebacklight source 113 emits a visible light beam to the inside of thelight guide plate 116 through thelight incident surface 1163, and the visible light beam is transmitted by thelight guide plate 116 and then emitted to the lower side of the display panel 111 from the light emitting surface 1161.

Thereflective sheet 115 is used for reflecting the visible light beam emitted from thebottom surface 1162 back to the inside of thelight guide plate 116, so as to improve the utilization rate of the visible light beam. In addition, when the receivingmodule 13 is disposed below thereflective sheet 115, thereflective sheet 115 can transmit the detection beam, and the transmittance of the detection beam is greater than 70%, for example. However, alternatively, when the imaging effect of the receivingmodule 13 is not affected, the transmittance of thereflective sheet 115 for the detection beam may not be limited to be greater than 70%.

Thediffusion sheet 116 is used to diffuse the visible light beam so that the visible light beam is homogenized.

The brightness enhancement sheet 118 is used for converging the visible light beam.

It should be noted that the structure of the side-intype backlight module 112 is one of the implementation manners of the present application, but the side-intype backlight module 112 may also be another suitable structure in some embodiments. For example, the brightness enhancement sheet 118 may be omitted.

The receivingmodule 13 includes, for example but not limited to, an ultramicrolens (not shown) and an image sensor (not shown) located below the ultramicrolens. The ultramicrolens is used for converging the detection light beam on the image sensor. However, the receivingmodule 13 may alternatively be another suitable structure, for example, the micro lens 131 is replaced by another suitable ultra-thin lens structure.

Optionally, the detection beam returned via the external object includes, for example and without limitation, a detection beam reflected or/and transmitted by the external object. The detection beam is, for example, but not limited to, near infrared light. The wavelength range of the near infrared light is 750nm to 2000 nm. In some embodiments, the wavelength of the near infrared light is 850nm or 940 nm.

The under-screen sensing device 10 further includes an emittingmodule 12, and the emittingmodule 12 is disposed below thebacklight module 112, for example but not limited to. The emittingmodule 12 is connected to thecontrol unit 18, and is configured to emit the detection beam to the external object through thedisplay module 11. The external object reflects the detection beam back to the receivingmodule 13, or/and the detection beam enters the external object, and after transmission, the detection beam is transmitted out to the receivingmodule 13 from the side of the external object facing the effective sensing area D.

However, alternatively, in some embodiments, the transmittingmodule 12 may be omitted.

Alternatively, in some embodiments, the receivingmodule 13 may be disposed inside thedisplay module 11, for example, inside the display panel 111. When the receivingmodule 13 is disposed inside the display panel 111, at least a part of the structure of the receivingmodule 13, such as but not limited to, being integrated in the pixel P, is different from the structure of the receivingmodule 13 described in the above embodiment, and thus, may be possible. In addition, the emittingmodule 12 can also be located at any suitable position such as the side of the display panel 111 or thebacklight module 112.

Thebacklight light source 113 includes a plurality of light emittingunits 1131. In this embodiment, the backlight lightsource driving circuit 16 drives the plurality of light emittingunits 1131 to be simultaneously turned on or causes the plurality of light emittingunits 1131 to be simultaneously turned off.

When the electronic device 1 is in the off-screen state, when the detection unit 17 detects a preset trigger operation of the user on the electronic device 1, thecontrol unit 18 controls thebacklight light source 113 to start to light. However, these triggering operations may often occur unintentionally, i.e. misoperation, during the process of carrying the electronic device 1 by the user, if each misoperation occurs, thebacklight light source 113 of thebacklight module 112 of the electronic device 1 is switched from the off state to the on state, which results in large power consumption of the electronic device 1, and the battery life and standby capability of the battery are weakened, which results in poor user experience.

In order to solve the above-mentioned technical problem that the power consumption of the electronic device 1 is large due to the fact that the plurality of light-emittingunits 1131 need to be turned on by an erroneous operation when the electronic device 1 is in the screen-off state, the inventor proposes the under-screen sensing device 20 according to the following second embodiment of the present application.

Referring to fig. 4, fig. 4 is a partial block diagram of a second embodiment of an off-screen sensing device of an electronic device 1 according to the present application. The underscreen sensing device 20 of the second embodiment is substantially the same as theunderscreen sensing device 10 of the first embodiment, and the two main differences are that: when the electronic device 1 is in the screen-off state and the detection unit 27 detects a preset trigger operation of the electronic device 1 by a user, thecontrol unit 28 controls the backlight lightsource driving circuit 26 to drive part of thelight emitting units 2131 in thebacklight light source 213 to emit light. Accordingly, the backlight module 212 may provide thedisplay panel 211 with the visible light beam for displaying the predetermined pattern.

Preferably, the part of thelight emitting units 2131 is adjacent to the effective sensing area D of the receiving module 23 on the outer surface 2190 of the electronic device 1, compared with the rest of thelight emitting units 2131 in thebacklight source 213.

When the electronic device 1 needs to display an image in the whole display area, the backlightsource driving circuit 26 drives thelight emitting units 2131 in thebacklight source 213 to emit light.

Compared with the under-screen sensing device 10, when the electronic device 1 is in the screen-off state and the detecting unit 27 detects the preset triggering operation of the user on the electronic device 1, the under-screen sensing device 20 only needs to highlight the light-emittingunit 2131, so that the power consumption of the electronic device 1 can be saved, and the purposes of saving power and the like are achieved.

For clarity, thelight emitting units 2131 in thebacklight light source 213 are divided into three groups. The three groups of light emitting units are a first group of light emitting units L1, a second group of light emitting units L2, and a third group of light emitting units L3, respectively. Wherein the second group of light emitting cells L2 is located between the first group of light emitting cells L1 and the third group of light emitting cells L3. The second group of light emitting cells L2 is closer to the effective sensing region D than the first and third groups of light emitting cells L1 and L3.

When the electronic device 1 is in the off-screen state and the detecting unit 27 detects a preset triggering operation of the electronic device 1 by the user, the backlightsource driving circuit 26 starts to drive the second group of light-emitting units L2 to emit light, so that the first group of light-emitting units L1 and the third group of light-emitting units L3 are turned off.

When the electronic device 1 needs to display an image in the whole display area, thebacklight driving circuit 26 drives all of the first, second, and third groups of light-emitting cells L1, L2, and L3 to emit light.

However, since the light-emitting time of the second group light-emitting unit L2 is longer than that of the first group light-emitting unit L1 and the third group light-emitting unit L3, the longer the usage time of the electronic device 1 is, the darker the light-emitting luminance of the second group light-emitting unit L2 is than that of the first group light-emitting unit L1 and the third group light-emitting unit L3, and thus, when the first group light-emitting unit L1, the second group light-emitting unit L2 and the third group light-emitting unit L3 emit light simultaneously, the image display luminance of the display module 21 becomes uneven, which seriously affects the display effect. In addition, the life of the second group light emitting cell L2 is shorter than the life of the first group light emitting cell L1 and the third group light emitting cell L3. Therefore, when the second group of light-emitting units L2 is damaged, the entirebacklight light source 213 is often replaced with a newbacklight light source 213 in consideration of the problem of the luminance uniformity of each group of light-emitting units, which may affect the user experience.

Further, since the backlightsource driving circuit 26 is to separately drive the second group of light emitting cells L2, the first group of light emitting cells L1, and the third group of light emitting cells L3, and to correspondingly drive the second group of light emitting cells L2 in a time-division multiplexing manner, a circuit structure of the backlightsource driving circuit 26 is more complicated than a circuit structure of the backlightsource driving circuit 16 to enable more complicated logic control, and a wiring between thebacklight source 213 and the backlightsource driving circuit 26 is more complicated than a wiring between thebacklight source 113 and the backlightsource driving circuit 16, thereby increasing a product cost of the under-screen sensing device 20.

After the inventors of the present application have creatively discovered various technical problems in the under-screen sensing device 10 and the under-screen sensing device 20, the technical prejudice that "the reflective sheet in the backlight module is used for reflecting the visible light beam, the light source for emitting visible light beams is not arranged below the reflector plate to provide the visible light beams for the display panel through the backlight module, the additional arrangement of the indicating light source below the reflector plate is firstly proposed, the indication light source replaces the backlight light source to emit the visible light beam when the backlight light source is turned off and the under-screen sensing device needs to display the preset pattern, the visible light beam emitted by the indicating light source can penetrate through the optical film group of the backlight module to irradiate the lower part of the display panel, and the display driving circuit can further drive partial pixels of the display panel to display the preset pattern so as to achieve the purpose of indicating the effective sensing area D. Next, an underscreen sensing device according to a third embodiment of the present application will be described in detail.

Referring to fig. 5 and fig. 6 together, fig. 5 is a partial cross-sectional view of a third embodiment of an under-screen sensing device of an electronic apparatus 1 according to the present application. Fig. 6 is a partial block diagram of the structure of the third embodiment of the off-screen sensing device of the electronic device 1 according to the present application. The structure of theunderscreen sensing device 30 is substantially the same as that of theunderscreen sensing device 10 of the first embodiment, and the two main differences are: firstly, the under-screen sensing device 30 further includes anindication light source 34 and an indication light source driving circuit 39 for driving theindication light source 34 to emit light, theindication light source 34 is disposed below thereflection sheet 315 of thebacklight module 312; secondly, the transmittance of thereflector plate 315 to the visible light beam is greater than 0 and less than 10%; thirdly, when the electronic device 1 is in the screen-off state and the detecting unit 37 detects a preset triggering operation of the user on the electronic device 1, the control unit 38 controls the indicating light source driving circuit 39 to drive the indicatinglight source 34 to emit light, and thereflector 315 can transmit the visible light beam emitted by the indicatinglight source 34.

The indicating light source driving circuit 39 is connected between the indicatinglight source 34 and the control unit 38.

When thebacklight source 313 of thebacklight module 312 is turned off and the detection unit 37 detects a preset triggering operation of the electronic device 1 by a user, the control unit 38 controls the indication light source driving circuit 39 to drive theindication light source 34 to emit a visible light beam, the visible light beam emitted by theindication light source 34 sequentially passes through thereflection sheet 315 and thelight guide plate 316 and is transmitted to thediffusion sheet 317, and the visible light beam is transmitted to thedisplay panel 311 after being diffused by thediffusion sheet 317 and condensed by the light enhancement sheet 318. The control unit 38 further controls the display driving circuit 35 to drive a portion of the pixels P of thedisplay panel 311 to display a predetermined pattern to indicate the effective sensing area D of the receivingmodule 33 on thedisplay module 31.

Optionally, theindication light source 34 is, for example, a plurality of indicationlight sources 34, and the plurality of indicationlight sources 34 are disposed around the receivingmodule 33. The visible light beams emitted by the plurality of indicatinglight sources 34 can form a whole bundle of light beams above the receivingmodule 33 or below a local area of thedisplay panel 311, for example, after being subjected to the homogenization treatment by thediffusion sheet 317. However, alternatively, in some embodiments, the number of the indicatinglight sources 34 may be one.

The indicatinglight source 34 is, for example, but not limited to, any one or more of a light emitting diode, a laser diode, or a vertical cavity surface emitting laser.

Optionally, the receivingmodule 33 is disposed opposite to the effective sensing area D. Alternatively, in some embodiments, the receivingmodule 33 may be disposed to be staggered from the effective sensing area D.

Optionally, thereflective sheet 315 is formed by laminating or adhering multiple layers of polymers having refractive indexes not identical to those of the detection beam and the visible beam. Accordingly, thereflective sheet 315 can achieve a transmittance of the detection beam different from a transmittance of the visible beam and a high reflectance of the visible beam.

Optionally, the transmittance of thereflective sheet 315 for visible light beams is less than 5% and greater than 0.3%. Therefore, the display effect of thedisplay panel 311 when displaying a full screen and the display effect when displaying the preset pattern are both better. However, alternatively, in some embodiments, the transmittance of thereflective sheet 315 for the indication light may be less than 5% and greater than 0.5% or less than 3% and greater than or equal to 0.6%. For example, the transmittance of thereflective sheet 315 with respect to visible light beams is 0.4%, 0.5%, 0.55%, 0.6%, 1%, 2%, or the like.

In addition, optionally, the transmittance of thereflective sheet 315 for the detection light beam is greater than 70%.

The total power of the indicatorlight source 34 is less than the total power of thebacklight light source 313. It is calculated that the total power of the indicatorlight source 34 is, for example, but not limited to, less than half of the total power of thebacklight light source 313.

For example, the total area of the plurality of pixels P of thedisplay panel 311 is 70mm × 140mm, the voltage of thebacklight light source 313 is 18V, the current is 40mA, and the total power thereof is 720 mW. When thebacklight source 313 is turned on, the irradiation area of thebacklight module 312 is 70mm × 140mm, and the utilization rate of the visible light beam emitted by thebacklight source 313 after penetrating through thedisplay module 31 to reach the outside of the electronic device 1 is 4%. It should be noted that the "utilization ratio" referred to in the present application refers to a ratio of the power of the visible light beam after exiting to the outside of the electronic apparatus 1 to the power of the visible light beam when exiting from the light source.

In contrast, the irradiation area of theindication light source 34 on thedisplay panel 311 is, for example, 10mm by 10mm, and the light beam utilization rate of theindication light source 34 is 0.1%. Therefore, the total power of the indicatinglight source 34 can be calculated to be 294 mW. Therefore, the total power of theindication light source 34 is 40% of the total power of thebacklight light source 313. Therefore, the power consumption of the electronic device 1 can be saved, and the battery life of the electronic device 1 can be improved.

However, when the areas of thedisplay panels 311 are different and the areas of the preset patterns are different, the total power of thebacklight light source 313 and the total power of theindication light source 34 are correspondingly different. However, since theindication light source 34 only needs to provide a visible light beam to a partial display area of thedisplay panel 311, the total power of theindication light source 34 is much smaller than that when all the light emitting units of thebacklight light source 113 of the off-screen sensing device 10 are turned on, so that more than half of the power can be saved.

Since the under-screen sensing device 30 is provided with theindication light source 34 below thebacklight module 312, the power saving is achieved, the display effect of thedisplay module 31 is not uneven due to long-term use of the product, the backlight source driving circuit 36 and the indication light source driving circuit 39 are two independent circuits, the structures of the two are relatively simple, and the structure of thebacklight source 313 is also relatively simple. When the indicatinglight source 34 is damaged, it is also easily repaired or replaced. Accordingly, the under-screen sensing device 30 has more product competitive advantages than the under-screen sensing device 20.

When the electronic device 1 displays a full screen, thebacklight light source 313 is turned on, and theindication light source 34 is turned off.

Optionally, the plurality of indicationlight sources 34 are symmetrically distributed around the receivingmodule 33.

Optionally, thebacklight module 312 further includes abottom plate 3121, thebottom plate 3121 is located below thereflective sheet 315, a through hole H is disposed on thebottom plate 3121 at a position facing theindication light source 34 and the receivingmodule 33, theindication light source 34 emits a visible light beam to thereflective sheet 315 through the through hole H, and the receivingmodule 33 receives the detection light beam emitted from thereflective sheet 315 through the through hole H. However, alternatively, in some embodiments, thebottom plate 3121 may be omitted.

In the present embodiment, thebottom plate 3121 includes one through hole H. However, alternatively, in some other embodiments, thebottom plate 3121 may also include a plurality of through holes H.

In this embodiment, the reflectingsheet 315 is not provided with a through hole for passing the visible light beam emitted from theindication light source 34. However, alternatively, in some other embodiments, thereflective sheet 315 may also be provided with a through hole (not shown) for passing the visible light beam emitted by theindication light source 34, so as to increase the intensity of the visible light beam.

In some embodiments, the electronic device 1 further includes a middle frame (not shown) for supporting the display module. The middle frame comprises a bottom part and a side part. The bottom is positioned below the backlight module. The side part is located at the side of the backlight module and the display panel and is used for being attached to part of the lower surface of thedisplay module 31. Optionally, the receivingmodule 33 and the indicatinglight source 34 are fixed on the bottom a of the middle frame.

Optionally, the effective sensing area D of the receivingmodule 33 on theouter surface 3190 is directly opposite to the partial pixels P displaying the preset pattern. Theindication light source 34 is located under a local area of thebacklight module 312, and when theindication light source 34 is turned on, a visible light beam emitted by the indication light source passes through thebacklight module 312 and then irradiates at least directly under a part of pixels P displaying the preset pattern.

When the part of the pixels P displays the preset pattern, part or all of the rest of the pixels P of thedisplay module 31 are in an off state, so as to prevent the visible light beam from passing through.

When the electronic device 1 is in the screen-off state, thebacklight source 312, theindication light source 34, and the receivingmodule 33 all stop working.

In an embodiment, after thebacklight light source 313 is turned off, when the detection unit 37 detects a preset touch operation of the user on the electronic device 1, the control unit 38 controls the indication light source driving circuit 39 to drive theindication light source 34 to be turned on and controls the display driving circuit 35 to drive thedisplay panel 311 to display the preset pattern, and also controls the receivingmodule 33 to perform biometric information sensing.

In addition, in the process that theindication light source 34 is turned on and the receivingmodule 33 performs the sensing of the biometric information, thedisplay panels 311 all display the same preset pattern or different preset patterns.

In order to be able to further save power consumption, the inventors propose another embodiment, as follows.

After the detection unit 37 detects a preset touch operation of the user on the electronic device 1, the control unit 38 controls the indication light source driving circuit 39 to drive theindication light source 34 to be turned on and controls the display driving circuit 35 to drive thedisplay panel 311 to display the preset pattern, and further controls the receivingmodule 33 to perform a pre-start with a first power consumption instead of starting to perform biometric information sensing with a second power consumption. Wherein the first power consumption is less than the second power consumption.

When the off-screen sensing device 30 includes the transmittingmodule 32, the transmittingmodule 32 does not operate when the control unit 38 controls the receivingmodule 33 to perform pre-start with the first power consumption.

Next, when the touch screen or the pressure sensor detects the touch or the press of the user on the effective sensing area D, the control unit 38 controls the transmittingmodule 32 to start transmitting the detection beam to the external object and controls the receivingmodule 33 to start performing the biometric information sensing with the second power consumption.

Since the transmittingmodule 32 does not operate when theindication light source 34 is turned on, and the receivingmodule 33 is pre-started with low power consumption, not only can the purpose of saving power consumption be achieved, but also preparation can be made in advance for the receivingmodule 33 to start to operate with the second power consumption.

Optionally, the brightness of the preset pattern displayed by thedisplay module 31 when the receivingmodule 33 operates with the first power consumption is smaller than the brightness of the preset pattern displayed by thedisplay module 31 when the receivingmodule 33 operates with the second power consumption. Thereby achieving power saving. In addition, the preset pattern displayed by thedisplay module 31 when the receivingmodule 33 operates with the first power consumption may be different from the preset pattern displayed by thedisplay module 31 when the receivingmodule 33 operates with the second power consumption.

The brightness of the visible light beam provided by theindication light source 34 to thedisplay panel 311 when the receivingmodule 33 operates with the first power consumption is less than the brightness of the visible light beam provided by theindication light source 34 to thedisplay panel 311 when the receivingmodule 33 operates with the second power consumption.

In another embodiment, after the detecting unit 37 detects a preset touch operation of the electronic device 1 by a user, the control unit 38 controls the indicating light source driving circuit 39 to drive the indicatinglight source 34 to be turned on and controls the display driving circuit 35 to drive thedisplay panel 311 to display the preset pattern, and the transmittingmodule 32 and the receivingmodule 33 are not operated.

Next, when the touch screen or the pressure sensor detects the touch or the press of the user on the effective sensing area D, the control unit 38 controls the transmittingmodule 32 to start transmitting the detection beam to the external object and controls the receivingmodule 33 to start performing the sensing of the biometric information.

Optionally, the brightness of the preset pattern displayed by thedisplay module 31 when theindication light source 34 is turned on but the receivingmodule 33 does not operate is less than the brightness of the preset pattern displayed by thedisplay module 31 when theindication light source 34 is turned on and the receivingmodule 33 operates. Thereby achieving power saving. In addition, the preset pattern displayed by thedisplay module 31 when theindication light source 34 is turned on but the receivingmodule 33 is not operated may be different from the preset pattern displayed by thedisplay module 31 when theindication light source 34 is turned on and the receivingmodule 33 is operated.

The brightness of the visible light beam provided by theindication light source 34 to thedisplay panel 311 when the receivingmodule 33 is not operated is less than the brightness of the visible light beam provided by theindication light source 34 to thedisplay panel 311 when the receivingmodule 33 is operated.

Alternatively, in some embodiments, in the under-screen sensing device 30, after thebacklight light source 313 of thebacklight module 312 is turned off, theindication light source 34 is kept in a lighting state instead of thebacklight light source 313, and thedisplay panel 311 displays a preset pattern. The turning-off operation of thebacklight source 313 is used as a trigger instruction for the control unit 38 to control theindication light source 34 and the receivingmodule 33 to start working. In this embodiment, the electronic apparatus 1 does not need to be touched or pressed or lifted by the user as a preset trigger operation. When thebacklight light source 313 of thebacklight module 312 is turned off, most of the display area of the electronic device 1 is black, and the position of the predetermined pattern is luminous.

In the above-described embodiments, the off-

screen sensing device

10, 20, 30 is, for example, a fingerprint sensing device for performing fingerprint sensing.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents and improvements made within the spirit and principle of the present application are intended to be included within the scope of the present application.