CN109037296B - Display device and electronic equipment - Google Patents

Abstract

The invention discloses a display device and electronic equipment, wherein a first structural layer and a second structural layer are arranged between a display array and an optical fingerprint sensor, and the second structural layer is positioned on the surface of one side, facing the optical fingerprint sensor, of the first structural layer; the refractive index of the first structural layer is greater than the refractive index of the second structural layer; a polycrystalline silicon active layer is arranged between the display array and the optical fingerprint sensor, and the second structural layer is positioned on one side, facing the optical fingerprint sensor, of the polycrystalline silicon active layer. When carrying out fingerprint collection, the in-process that the optical signal who contains fingerprint information passes through OLED display panel and incides optical fingerprint sensor can loop through first structural layer and second structural layer, because the refracting index of first structural layer is great, can take place the total reflection in the interface department of the two, can make the total reflection take place for the optical signal of big angle incidence to the optical fingerprint sensor is avoided the light sensing unit and is crosstalked the problem.

Description

Display device and electronic equipment

Technical Field

The present invention relates to the field of electronic devices, and more particularly, to a display device and an electronic device.

Background

With the continuous development of science and technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present.

Electronic equipment has increasingly powerful functions, personal information stored in the electronic equipment is increasingly and more important, in order to ensure the safety of the personal information, the electronic equipment needs to have an identity recognition function, and a fingerprint recognition mode becomes a mainstream mode of identity recognition of the current electronic equipment with the advantages of high safety, convenience in use and the like.

The main component of the electronic device that implements the display function is the display panel. An OLED display panel is a commonly used display panel at present. When integrated fingerprint identification function in OLED display panel, a mode is at the integrated optics fingerprint sensor of OLED display panel's the back, when carrying out fingerprint identification, the finger of pressing the fingerprint identification district is shone to the light that sends through OLED display panel, and optics fingerprint sensor gathers fingerprint image through the reflection light based on the fingerprint.

The optical fingerprint sensor is provided with a plurality of light sensing units, and is used for collecting light signals reflected by a fingerprint area right above the area to form a fingerprint image of the area, and the light sensing units are easily interfered by reflected light signals of other areas of a finger, so that the fingerprint identification precision is poor.

Disclosure of Invention

In order to solve the above problems, the present invention provides a display device and an electronic apparatus, which can avoid the crosstalk problem of a light sensing unit in an optical fingerprint sensor and improve the accuracy of fingerprint identification.

In order to achieve the above purpose, the invention provides the following technical scheme:

a display device, the display device comprising:

an OLED display panel including a display array;

an optical fingerprint sensor disposed on a backlight side of the display array; in a first direction, at least part of the light emergent area of the display array is a fingerprint identification area, and the optical fingerprint sensor is arranged opposite to the fingerprint identification area; the first direction is perpendicular to the OLED display panel;

a first structural layer and a second structural layer are arranged between the display array and the optical fingerprint sensor, and the second structural layer is positioned on the surface of one side, facing the optical fingerprint sensor, of the first structural layer; the refractive index of the first structural layer is greater than the refractive index of the second structural layer;

a polycrystalline silicon active layer is arranged between the display array and the optical fingerprint sensor, and the second structural layer is positioned on one side, facing the optical fingerprint sensor, of the polycrystalline silicon active layer.

Preferably, in the above display device, the display array includes a plurality of OLED pixels arranged in an array, and a light-transmitting gap is provided between adjacent OLED pixels;

the optical fingerprint sensor is provided with a plurality of light sensing units which are arranged in an array, and the light sensing units are used for collecting fingerprint images; in the first direction, the light sensing unit is arranged opposite to the light-transmitting gap.

Preferably, in the display device, one light sensing unit is disposed between any two adjacent OLED pixels in the fingerprint identification area.

Preferably, in the display device, a light emitting region of a part of the display array is a fingerprint identification region, and an area of the fingerprint identification region is not more than 2cm × 2 cm.

Preferably, in the above display device, the refractive index of the second structural layer ranges from 1.1 to 1.3, inclusive.

Preferably, in the display device, the second structure layer is a silicon nitride layer or a silicon oxide layer.

Preferably, in the display device, the OLED display panel has an array substrate, the array substrate includes the polysilicon active layer and an insulating medium layer, the polysilicon active layer is located on a surface of the insulating medium layer facing away from the optical fingerprint sensor, and the polysilicon active layer is used for preparing a TFT;

the polysilicon active layer is used as the first structural layer, and the insulating medium layer is used as the second structural layer.

Preferably, in the display device, the OLED display panel has an array substrate including a transparent substrate, and the display array is located on a side of the transparent substrate facing away from the optical fingerprint sensor;

the surface of one side of the transparent substrate, which is far away from the display array, is provided with the second structural layer;

the transparent substrate serves as the first structural layer.

Preferably, in the display device, the OLED display panel has a display driving circuit, and the display driving circuit is configured to drive the display array to display an image;

when the optical fingerprint sensor collects a fingerprint image, the display driving circuit is further used for driving the display array to display a preset image corresponding to the position of the fingerprint identification area so as to display the position of the fingerprint identification area.

Preferably, in the above display device, the display array includes a plurality of OLED pixels arranged in an array;

the drive circuit is provided with a plurality of pixel circuits which are connected with the OLED pixels in a one-to-one corresponding mode, the pixel circuits are used for acquiring display data signals of a control chip and controlling the connected OLED pixels to display an image to be displayed based on the display data signals;

the pixel circuit connected with the OLED pixels and located in the fingerprint identification area is further used for acquiring fixed data signals sent by the control chip when a fingerprint identification request exists, and controlling the connected OLED pixels to display the preset image based on the fixed data signals.

The invention also provides electronic equipment which comprises the display device.

As can be seen from the above description, in the display device and the electronic apparatus provided in the technical solution of the present invention, a first structural layer and a second structural layer located on a surface of the first structural layer facing the optical fingerprint sensor are disposed between the display array and the optical fingerprint sensor; the refractive index of the first structural layer is greater than the refractive index of the second structural layer; a polycrystalline silicon active layer is arranged between the display array and the optical fingerprint sensor, and the second structural layer is positioned on one side, facing the optical fingerprint sensor, of the polycrystalline silicon active layer. Like this, when carrying out fingerprint collection, the in-process that the optical signal who contains fingerprint information passes through OLED display panel and incides optical fingerprint sensor can loop through first structural layer and second structural layer, because the refracting index of first structural layer is great, so can take place the total reflection in the interface department of the two to can make the total reflection take place for the optical signal of big angle incidence, thereby avoid optical fingerprint sensor sensing unit to cross talk the problem, improve fingerprint identification's precision.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a display device integrated with an optical fingerprint sensor;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a configuration of a fingerprint identification area according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating an operating principle of a driving circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device integrated with an optical fingerprint sensor, and anoptical fingerprint sensor 12 is integrated on a back surface of anOLED display panel 11, so that compared to a conventional capacitive fingerprint sensor, there is no need to provide an opening on a surface of the display panel to place the capacitive fingerprint sensor, and a screen occupation ratio can be improved.

Between theoptical fingerprint sensor 12 and theOLED display panel 11, there is acollimating system 15, and thecollimating system 15 may be a fiber optic panel fop (fiber optical panels). The upper surface of thecollimating system 15 is fixedly bonded with theOLED display panel 11 through one layer of optical cement OCA1, and the lower surface is fixedly bonded with theoptical fingerprint sensor 12 through another layer of optical cement OCA 2. The side of theoptical fingerprint sensor 12 away from the light-emitting surface of theOLED display panel 11 is bound to thecircuit board 19. The display device protects thecollimating system 15 and theoptical fingerprint sensor 12 by sealing with asealing glue 18.

TheOLED display panel 11 has anarray substrate 10 and a plurality ofOLED pixels 13 disposed on thearray substrate 10. Thearray substrate 10 comprises atransparent substrate 101 and a driving circuit arranged on a side of thetransparent substrate 101 facing away from theoptical fingerprint sensor 12, wherein the driving circuit comprises a plurality of Thin Film Transistors (TFTs). The thin film transistor TFT includes a gate electrode G, a source electrode S, and a drain electrode D. The lower ends of the source S and the drain D are connected to theactive region 102. TheOLED pixel 13 includes ananode 131, a light emittingfunctional layer 132, and acathode 133 sequentially arranged from bottom to top. Theanodes 131 of all theOLED pixels 13 are independent structures, and thecathodes 133 are the same transparent electrode layer. Theanode 131 of eachOLED pixel 13 is individually connected to the source S of one thin film transistor TFT.

Thearray substrate 10 is provided with a pixel defining layer PDL for dividing a plurality of pixel regions each for disposing theanode 131 of oneOLED pixel 13 and the lightemitting function layer 132. The pixel defining layer PDL is provided thereon with support columns PS, which are located on the pixel defining layer PDL between adjacent pixel regions. For supporting the cover plate 161.

Theoptical fingerprint sensor 12 has a plurality oflight sensing units 14. When a fingerprint image is collected, afinger 17 touches the area, facing theoptical fingerprint sensor 12, of thecover plate 16 of theOLED display panel 11, an emergent light signal of theOLED pixel 13 in the area irradiates thefinger 17, is reflected by thefinger 17, then sequentially enters thelight sensing unit 14 of theoptical fingerprint sensor 12 through theOLED display panel 11 and thecollimating system 15, and then forms the fingerprint image through thelight sensing unit 14.

Ideally, eachlight sensing unit 14 collects the light signal reflected by thefinger 17 at the opposite position above the light sensing unit to form the fingerprint image of the part of the finger, but as shown by the dotted arrow in fig. 1, the propagation direction of the light signal incident on eachlight sensing unit 14 cannot be precisely controlled in the display device, so that the light signal reflected by the part of the finger opposite to onelight sensing unit 14 is incident on anotherlight sensing unit 14, and thus, noise crosstalk is generated on the otherlight sensing unit 14, which affects the accuracy of fingerprint identification.

In order to solve the above problem, an embodiment of the present invention provides a display device and an electronic apparatus, where a fingerprint identification area is disposed in the fingerprint identification area, and a first structural layer and a second structural layer are disposed between the display array and the optical fingerprint sensor, where the first structural layer is located on a side surface of the optical fingerprint sensor facing the first structural layer; the refractive index of the first structural layer is greater than the refractive index of the second structural layer; the display array comprises a polycrystalline silicon active layer, and the second structural layer is positioned on one side, facing the optical fingerprint sensor, of the polycrystalline silicon active layer. Like this, when carrying out fingerprint collection, the in-process that the optical signal who contains fingerprint information passes through OLED display panel and incides optical fingerprint sensor can loop through first structural layer and second structural layer, because the refracting index of first structural layer is great, so can take place the total reflection in the interface department of the two to can make the total reflection take place for the optical signal of big angle incidence, thereby avoid optical fingerprint sensor sensing unit to cross talk the problem, improve fingerprint identification's precision.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention, the display device including: anOLED display panel 21 and anoptical fingerprint sensor 22. TheOLED display panel 21 has acover plate 26, and when fingerprint identification is performed, afinger 27 touches thecover plate 26, and an optical signal emitted by the OLED display panel is reflected by thefinger 27 and then enters theoptical fingerprint sensor 22, so that fingerprint collection is performed.

TheOLED display panel 21 includes a display array. The display array comprises a plurality ofOLED pixels 23 arranged in an array, and light-transmitting gaps are arranged betweenadjacent OLED pixels 23. TheOLED pixel 23 has ananode 231, a light emittingfunction layer 232 and acathode 233, theOLED display panel 21 has anarray substrate 25, a pixel definition layer PDL is disposed on a side of thearray substrate 25 away from theoptical fingerprint sensor 22, and the pixel definition layer PDL is the same as the pixel definition layer PDL shown in fig. 1 and is used for disposing theOLED pixel 23, the support pillar PS and thecover plate 26. The pixel definition layer PDL, theOLED pixels 23, the supporting pillars PS, and thecover plate 26 are the same as those in fig. 1 and are not described again here.

Theoptical fingerprint sensor 22 is arranged on the back of theOLED display panel 21, namely, theoptical fingerprint sensor 22 is arranged on the side opposite to the light-emitting side of the display array; in the first direction, at least a part of the light emitting area of the display array is a fingerprint identification area, and theoptical fingerprint sensor 22 is arranged opposite to the fingerprint identification area. The first direction is perpendicular to theOLED display panel 21.

A firststructural layer 32 and a secondstructural layer 31 on a surface of the firststructural layer 32 facing theoptical fingerprint sensor 22 are arranged between the display array and theoptical fingerprint sensor 22; the refractive index of the firststructural layer 31 is greater than the refractive index of the secondstructural layer 32. Thus, when the optical signal reflected by thefinger 27 propagates downwards, the optical signal (i) incident at a large angle can be totally reflected at the interface between the firststructural layer 32 and the secondstructural layer 31, so that the crosstalk problem of thesensing unit 24 in theoptical fingerprint sensor 22 can be avoided, and the fingerprint identification accuracy is improved. The dashed arrows indicate the direction of light propagation. The optical signal (i) with large incidence angle is obliquely incident, and has a larger incidence angle with the interface, and the incidence angle is larger than the critical angle of total reflection at the interface.

In theOLED display panel 21, there is a polysiliconactive layer 33. The side of the polysiliconactive layer 33 away from theoptical fingerprint sensor 22 is provided with an anode of the OLED pixel and light-tight structures such as various signal lines. And a gap is arranged between the light-tight structures and is used as a light-transmitting window. After the light signal (i) incident at a large angle enters the lower part of the polysiliconactive layer 33 through the light transmission window of the light-tight structure, the light signal (i) may further enter theoptical fingerprint sensor 22 to cause a crosstalk problem. If the first structural layer and the second structural layer are arranged above the polysilicon active layer, the OLED display panel has multiple structural layers, after the high-angle incident light signal is filtered by total reflection at the interface between the firststructural layer 32 and the secondstructural layer 31, the light signal transmitted through the interface changes the propagation angle after being reflected and refracted by the structural layers below the interface, the high-angle light signal causing the crosstalk problem still can be formed, and the effect of eliminating the crosstalk is not ideal.

Therefore, in theOLED display panel 21 of the present application, a polysiliconactive layer 33 is disposed between the display array and the optical fingerprint sensor, and the secondstructural layer 31 is disposed on a side of the polysiliconactive layer 33 facing theoptical fingerprint sensor 22. In theOLED display panel 21, except for the specific firststructural layer 32 and the specific secondstructural layer 31 in the embodiment of the present invention, other structural layers below the polysiliconactive layer 33 are generally transparent structures, the refractive index difference between different structural layers is small, and after total reflection at the interface between the firststructural layer 32 and the secondstructural layer 31, the transmission angle of the transmitted optical signal is changed by reflection and refraction when the transmitted optical signal propagates downward, so that a large-angle incident optical signal is not formed twice, and the crosstalk problem can be avoided to a large extent.

Specifically, theOLED display panel 21 has anarray substrate 25, thearray substrate 25 includes atransparent substrate 33, and the polysiliconactive layer 33 is disposed on a side of thetransparent substrate 33 away from theoptical fingerprint sensor 22.

Theoptical fingerprint sensor 22 is provided with a plurality oflight sensing units 24 which are arranged in an array, and thelight sensing units 24 are used for collecting fingerprint images; in the first direction, thelight sensing unit 24 is disposed opposite to the light transmitting gap between theOLED pixels 23. Thus, the light signal reflected by thefinger 27 can be incident on theoptical fingerprint sensor 22 through the light-transmitting gaps of theOLED pixels 23 to facilitate fingerprint acquisition. The OLED display panel has support posts PS on a pixel defining layer PDL between adjacent OLED pixels. The support posts PS are made of opaque material. Thelight sensing units 24 do not overlap the support posts PS in a direction perpendicular to theOLED display panel 21.

Thelight sensing unit 24 is disposed on a surface of acircuit board 28, and thelight sensing unit 24 faces theOLED display panel 21. Between theoptical fingerprint sensor 22 and theOLED display panel 21 there is acollimating system 401, whichcollimating system 401 may be a fiber optic panel FOP in the same way as shown in fig. 1. The upper surface of thecollimating system 401 is fixedly bonded with theOLED display panel 21 through an optical adhesive layer OCA1, and the lower surface is fixedly bonded with theoptical fingerprint sensor 22 through an optical adhesive layer OCA 2. Thecollimating system 400 and theoptical fingerprint sensor 22 are sealed by apotting compound 400.

In a general finger fingerprint, the width of a ridge line L1 is 200-400 μm, and the width of a valley line L2 is 150-250 μm. The line width of thelight sensing unit 24 is adapted to the valley line width, and the line width of thelight sensing unit 24 may be set to be 200 μm.

TheOLED display panel 21 has opposite light-emitting sides and a backlight layer. The light exit side includes the display area of theOLED display panel 21. Theoptical fingerprint sensor 22 is disposed on the backlight side. Part of the display area can be set as the fingerprint identification area, and the whole display area can also be set as the fingerprint identification area.

As shown in fig. 3, fig. 3 is a schematic diagram illustrating a setting principle of a fingerprint identification area according to an embodiment of the present invention, in which the display device according to an embodiment of the present invention has a display area AA, a part of the display area AA is a fingerprint identification area AA1, theoptical fingerprint sensor 22 with a smaller size can be disposed in a predetermined area on the back side of the display device, and a fingerprint identification area AA1 with a fixed position in the display area AA performs fingerprint acquisition and identification, so that the display area AA includes a fingerprint identification area AA1, and a part of the display area AA is a fingerprint identification area AA 1. The other part of the display area is the non-fingerprint identification area AA 2. The position of the fingerprint identification area AA1 in the display area AA can be set according to the requirement, in the mode shown in fig. 3, the fingerprint identification area AA1 is located at the center of the display area AA, and in other modes, it can be located at the upper end, the lower end, or any vertex angle area of the display area AA.

The fingerprint identification area can be provided, and onelight sensing unit 24 is arranged between any twoadjacent OLED pixels 23. Therefore, the fingerprint identification area is provided with morelight sensing units 24, on one hand, the resolution of fingerprint identification can be improved, and on the other hand, when the number of thelight sensing units 24 is fixed, morelight sensing units 24 can be arranged in a smaller area, so that the area of theoptical fingerprint sensor 22 is reduced.

When the finger touches the display device to perform fingerprint identification, the contact area with thecover plate 26 is generally not more than 2cm × 2cm, so in the embodiment of the present invention, a part of the light emitting area of the display array is set as a fingerprint identification area, and the area of the fingerprint identification area is not more than 2cm × 2 cm. The shape of the fingerprint identification area can be circular, oval or polygonal.

In the embodiment of the present invention, the refractive index of thesecond structure layer 31 ranges from 1.1 to 1.3, inclusive. Optionally, thesecond structure layer 31 is a silicon nitride layer or a silicon oxide layer.

In the manner shown in fig. 2, theOLED display panel 21 has anarray substrate 25, thearray substrate 25 includes atransparent substrate 30, and the display array is located on a side of thetransparent substrate 30 facing away from theoptical fingerprint sensor 22; in this manner, the secondstructural layer 31 is disposed on a surface of thetransparent substrate 30 facing away from the display array. In this manner, thetransparent substrate 30 is multiplexed as the firststructural layer 32, and a required total reflection process can be achieved only by adding a secondstructural layer 31 on the backlight side of theOLED display panel 21. Thearray substrate 25 further includes the polysiliconactive layer 33, and the polysiliconactive layer 33 is located between the display array and thetransparent substrate 30.

Thetransparent substrate 30 is a glass substrate, and the main material thereof is silicon oxide. In this manner, a new film layer, the refractive index N of which, the silicon oxide (SiO) and the polysilicon (Poly) active layer, is as shown in table 1 below, is used as thesecond structure layer 31.

TABLE 1

Item	R	G	B
				N(Poly)	5.024	4.754	4.373
N(SiO)	1.467	1.47	1.475
				N (newly added film)	1.1-1.3	1.1-1.3	1.1-1.3

As can be seen from table 1, the glass substrate is used as thefirst structure layer 32, the refractive index is about 1.47, the newly added film layer used as thesecond structure layer 31 may be a silicon nitride film, the refractive index range of the newly added film layer can be controlled to be 1.1-1.3 by a silicon nitride coating process, so that the refractive index of the newly added film layer is smaller than that of thefirst structure layer 32, and for RGB three-color light, the refractive index of thesecond structure layer 31 is smaller than that of thesecond structure layer 31, so that the total reflection process required by the technical scheme of the present application can be implemented.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present invention, in which theOLED display panel 21 has anarray substrate 25, and thearray substrate 25 includes a polysiliconactive layer 33 and an insulating medium layer. The polysiliconactive layer 33 is located on a surface of the insulating medium layer facing away from theoptical fingerprint sensor 22. In this embodiment, the polysiliconactive layer 33 serves as the firststructural layer 32, and the insulating dielectric layer serves as the secondstructural layer 31. The insulating dielectric layer may be a silicon oxide layer. The refractive indexes of the polysiliconactive layer 33 and the silicon oxide layer for RGB three-color light are shown in table 2 below.

TABLE 2

Item	R	G	B
				N(Poly)	5.024	4.754	4.373
N(SiO)	1.467	1.47	1.475

As can be seen from table 2, the silicon oxide is used as thesecond structure layer 31, the polysiliconactive layer 33 is used as thefirst structure layer 32, and for RGB three-color light, the refractive index of thesecond structure layer 31 is smaller than that of thefirst structure layer 32, so that the total reflection process required by the present application can be implemented.

In the manner shown in fig. 3, the existing functional layers of theOLED display panel 21 are directly reused as the firststructural layer 32 and the secondstructural layer 31 without separately preparing the firststructural layer 32 and the secondstructural layer 31, so that the panel thickness is not increased, and the manufacturing cost is reduced.

In the embodiment of the invention, in theOLED display panel 21, the polysiliconactive layer 33 is used for preparing a thin film transistor TFT. The TFT has a top gate structure, and the gate G, the source S and the drain D are all located on a side of the polysiliconactive layer 33 away from thelens substrate 30. Generally, only one buffer layer having no requirement on refractive index is disposed between the polysiliconactive layer 33 and thetransparent substrate 30, so as to form the polysiliconactive layer 33 on thetransparent substrate 30. In the embodiment of the present invention, an insulating medium layer may be added on the lower surface of the polysilicon active layer as the secondstructural layer 32, or the buffer layer may be reused as the secondstructural layer 32, so as to implement the required total reflection process. When the multiplexing buffer layer is used as thesecond structure layer 32, unlike the existing buffer structure, in the existing buffer layer, since there is no requirement for the refractive index, and since the film layer materials are different or the same material is different, the refractive index range of the buffer layer is uncertain, in the embodiment of the present application, when the multiplexing buffer layer is used as the second structure layer, the refractive index of the prepared buffer layer is smaller than the refractive index of the polysiliconactive layer 33, so as to implement the required total reflection process. TheOLED display panel 21 has a display driving circuit for driving the display array to display an image. The driving circuit includes the thin film transistor TFT. The thin film transistor TFT is of the top gate structure. When theoptical fingerprint sensor 22 collects a fingerprint image, the display driving circuit is further configured to drive the display array to display a preset image corresponding to the position of the fingerprint identification area, so as to display the position of the fingerprint identification area. This facilitates the user in locating the fingerprint identification area for facilitating fingerprint acquisition.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating an operating principle of a driving circuit according to an embodiment of the present invention, in which anOLED display panel 21 has a plurality ofOLED pixels 23 arranged in an array, and fig. 5 shows anOLED pixel 231 located in a fingerprint identification area and anOLED pixel 232 located in a non-fingerprint identification area.

The driving circuit is provided with a plurality ofpixel circuits 51 which are connected with theOLED pixels 23 in a one-to-one correspondence mode, thepixel circuits 51 are used for obtaining display DATA signals DATA1 of a control chip IC, and the connected OLED pixels are controlled to display images to be displayed based on the display DATA signals DATA 1. As shown in fig. 5, during normal display, thepixel circuit 511 connected to theOLED pixel 232 and thepixel circuit 512 connected to theOLED pixel 231 both obtain the display DATA signal DATA1 sent by the control IC to control the connectedOLED pixel 231 andOLED pixel 232 to display the image to be displayed respectively.

Thepixel circuit 51 connected to theOLED pixel 23 located in the fingerprint identification area is further configured to obtain a fixed DATA signal DATA2 sent by the control chip IC when there is a fingerprint identification request, and control the connectedOLED pixel 23 to display the preset image based on the fixed DATA signal DATA 2. When the OLED pixel unit normally displays, the control chip IC is disconnected from thepixel circuit 512, and when there is a fingerprint identification request, a control signal is generated to enable the control chip IC to be connected to thepixel circuit 512, so as to provide a fixed DATA signal DATA2 for theOLED pixel 231 in the fingerprint identification area to display a preset image. At this time, the control chip IC supplies the fixed DATA signal DATA2 only to thepixel circuit 512 and normally supplies the display DATA signal DATA1 to theOLED pixels 232 of the non-fingerprint recognition area, so that theOLED pixels 232 of the non-fingerprint recognition area normally display an image. The fixed DATA signal DATA2 causes the display brightness of the OLED231 pixels in the fingerprint identification region to increase or decrease relative to the display brightness of theOLED pixels 232 in the non-fingerprint identification region to show the preset image.

The control chip IC may output the fixed DATA signal DATA2 to thepixel circuit 512 directly, or may output the fixed DATA signal DATA2 through the FPC and output the fixed DATA signal DATA2 to thepixel circuit 512 through the FPC.

The display device is used for electronic equipment. The preset image is a hidden icon and is used for showing the position of the fingerprint identification area when the preset image is displayed. When a user inputs a fingerprint acquisition trigger signal, the drive circuit is used for driving the OLED pixels in the fingerprint identification area to display the preset image. The fingerprint acquisition trigger signal can be input through a mechanical key of the electronic equipment. Or the user inputs when triggering the touch icon of the OLED display panel. And when the fingerprint acquisition trigger signal is acquired, the control chip generates the control signal.

As can be seen from the above description, the embodiment of the invention provides a display device, wherein a firststructural layer 32 and a secondstructural layer 31 are disposed between the display array and theoptical fingerprint sensor 22, and are located on a surface of the firststructural layer 32 facing theoptical fingerprint sensor 22; the refractive index of the firststructural layer 32 is greater than the refractive index of the secondstructural layer 31. Like this, when carrying out fingerprint collection, the in-process that the optical signal who contains fingerprint information incidesoptical fingerprint sensor 22 throughOLED display panel 31 can loop through firststructural layer 32 and secondstructural layer 31, because the refracting index of firststructural layer 32 is great, so can take place the total reflection in the interface department of the two, thereby can make the optical signal of big angle incidence take place the total reflection, thereby avoid optical fingerprint sensor sensing unit crosstalk problem, improve fingerprint identification's precision.

Based on the foregoing embodiment, another embodiment of the present invention further provides an electronic device, where the electronic device is shown in fig. 6, and fig. 6 is a schematic structural diagram of the electronic device according to the embodiment of the present invention, and the electronic device includes thedisplay device 41 according to the foregoing embodiment. The electronic device can be a mobile phone, a tablet computer, a wearable electronic device or other electronic devices with a display function.

According to the electronic equipment provided by the embodiment of the invention, the display device provided by the embodiment is adopted, and the optical fingerprint sensor is integrated in the display device, so that the problem of crosstalk among different photosensitive units can be avoided, and the fingerprint identification precision is improved.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the electronic device disclosed in the embodiment, since it corresponds to the display device disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the corresponding parts of the display device for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A display device, characterized in that the display device comprises:

an OLED display panel including a display array;

an optical fingerprint sensor disposed on a backlight side of the display array; in a first direction, at least part of the light emergent area of the display array is a fingerprint identification area, and the optical fingerprint sensor is arranged opposite to the fingerprint identification area; the first direction is perpendicular to the OLED display panel;

a first structural layer and a second structural layer are arranged between the display array and the optical fingerprint sensor, and the second structural layer is positioned on the surface of one side, facing the optical fingerprint sensor, of the first structural layer; the refractive index of the first structural layer is greater than the refractive index of the second structural layer;

a polysilicon active layer is arranged between the display array and the optical fingerprint sensor, and the second structural layer is positioned on one side of the polysilicon active layer facing the optical fingerprint sensor;

the OLED display panel is provided with an array substrate, the array substrate comprises a polycrystalline silicon active layer and an insulating medium layer, the polycrystalline silicon active layer is located on the surface of one side, away from the optical fingerprint sensor, of the insulating medium layer, and the polycrystalline silicon active layer is used for preparing a TFT; the polycrystalline silicon active layer is used as the first structural layer, and the insulating medium layer is used as the second structural layer.

2. The display device according to claim 1, wherein the display array comprises a plurality of OLED pixels arranged in an array, and adjacent OLED pixels have a light-transmitting gap therebetween;

the optical fingerprint sensor is provided with a plurality of light sensing units which are arranged in an array, and the light sensing units are used for collecting fingerprint images; in the first direction, the light sensing unit is arranged opposite to the light-transmitting gap.

3. The display device according to claim 2, wherein one light sensing unit is arranged between any two adjacent OLED pixels in the fingerprint identification area.

4. The display device according to claim 1, wherein a portion of the light emitting area of the display array is a fingerprint identification area, and the area of the fingerprint identification area is not more than 2cm x 2 cm.

5. The display device of claim 1, wherein the refractive index of the second structural layer ranges from 1.1 to 1.3, inclusive.

6. The display device of claim 1, wherein the second structure layer is a silicon nitride layer or a silicon oxide layer.

7. The display device according to claim 1, wherein the OLED display panel has a display driving circuit for driving the display array for image display;

when the optical fingerprint sensor collects a fingerprint image, the display driving circuit is further used for driving the display array to display a preset image corresponding to the position of the fingerprint identification area so as to display the position of the fingerprint identification area.

8. The display device according to claim 7, wherein the display array comprises a plurality of OLED pixels arranged in an array;

the drive circuit is provided with a plurality of pixel circuits which are connected with the OLED pixels in a one-to-one corresponding mode, the pixel circuits are used for acquiring display data signals of a control chip and controlling the connected OLED pixels to display an image to be displayed based on the display data signals;

the pixel circuit connected with the OLED pixels and located in the fingerprint identification area is further used for acquiring fixed data signals sent by the control chip when a fingerprint identification request exists, and controlling the connected OLED pixels to display the preset image based on the fixed data signals.

9. An electronic device characterized in that the electronic device comprises a display device according to any one of claims 1-8.

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