CN110491338B - Pixel circuit and driving method thereof, light emission control circuit and method, and display device - Google Patents

Abstract

Translated fromChinese

本公开是关于一种像素电路及其驱动方法、发光控制电路及方法、显示装置，所述像素电路包括第一驱动子电路、第二驱动子电路、数据写入子电路发光控制子电路和储能子电路，第一驱动子电路分别连接第一电源端、发光元件和第一节点，用于产生第一驱动电流；数据写入子电路用于响应扫描信号而将数据信号传输至所述第一节点；第二驱动子电路分别连接所述发光元件和所述第一节点，用于产生第二驱动电流；发光控制子电路用于响应发光控制信号而将第一电源信号传输至第二驱动子电路；储能子电路第一端连接于所述数据写入子电路的第二端，第二端连接于所述第一电源端。

The present disclosure relates to a pixel circuit and a driving method thereof, a light-emitting control circuit and method, and a display device. The pixel circuit includes a first driving sub-circuit, a second driving sub-circuit, a data writing sub-circuit, a light-emitting control sub-circuit, and a storage sub-circuit. an energy sub-circuit, the first driving sub-circuit is respectively connected to the first power supply terminal, the light-emitting element and the first node, and is used for generating a first driving current; the data writing sub-circuit is used for transmitting the data signal to the first power supply terminal in response to the scanning signal a node; the second driving sub-circuit is respectively connected to the light-emitting element and the first node for generating a second driving current; the light-emitting control sub-circuit is used for transmitting the first power signal to the second driving in response to the light-emitting control signal Subcircuit; the first end of the energy storage subcircuit is connected to the second end of the data writing subcircuit, and the second end is connected to the first power supply end.

Description

Pixel circuit, driving method thereof, light-emitting control circuit, light-emitting control method and display device

Technical Field

The disclosure relates to the technical field of display, and in particular to a pixel circuit, a driving method thereof, a light-emitting control circuit and method, and a display device.

Background

With the development and progress of the technology, the use of an OLED (Organic Light Emitting Diode) display device is gradually spreading. The OLED brightness adjustment method includes a time ratio method and an area ratio method, and the time ratio method is used more at present. The time ratio method controls the brightness of the OLED by controlling the light emitting time of the OLED, and realizes low brightness by adjusting the frequency of the light emitting control signal to be low when the brightness is low, and the low-frequency light emitting control signal can cause the flicker frequency of the display device and damage the eyes of people.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to a pixel circuit, a driving method thereof, a light-emitting control circuit and method thereof, and a display device, so as to overcome the problem that the display device may generate flicker frequency and damage human eyes at low brightness in the related art at least to a certain extent.

According to a first aspect of the present disclosure, there is provided a pixel circuit comprising:

a first driving sub-circuit, connected to the first power terminal, the light emitting element and the first node, respectively, for generating a first driving current;

a data write-in sub-circuit, respectively connected to the data signal terminal, the first node and the scan signal terminal, for transmitting a data signal to the first node in response to a scan signal;

a second driving sub-circuit, respectively connected to the light emitting element and the first node, for generating a second driving current;

a light-emitting control sub-circuit, respectively connected to the first power terminal, the second driving sub-circuit and the light-emitting control terminal, for transmitting a first power signal to the second driving sub-circuit in response to a light-emitting control signal;

and the first end of the energy storage sub-circuit is connected to the second end of the data writing sub-circuit, and the second end of the energy storage sub-circuit is connected to the first power supply end.

According to an embodiment of the present disclosure, the first driving sub-circuit includes:

a first driving transistor, having a first terminal connected to the first power terminal, a second terminal connected to the light emitting element, and a control terminal connected to the first node;

the second drive sub-circuit includes:

and the first end of the second driving transistor is connected to the light-emitting control sub-circuit, the second end of the second driving transistor is connected to the light-emitting element, and the control end of the second driving transistor is connected to the first node.

According to an embodiment of the present disclosure, a width-to-length ratio of the first driving transistor channel is smaller than a width-to-length ratio of the second driving transistor channel.

According to an embodiment of the present disclosure, a length of the first driving transistor channel is greater than a length of the second driving transistor channel.

According to an embodiment of the present disclosure, the data writing sub-circuit includes:

and the first end of the first transistor is connected with the data signal end, the second end of the first transistor is connected with the first node, and the control end of the first transistor is connected with the scanning signal end and used for responding to the scanning signal to be conducted so as to transmit the data signal to the first node.

According to an embodiment of the present disclosure, the light emission control sub-circuit includes:

and a second transistor, having a first terminal connected to the first power terminal, a second terminal connected to the first terminal of the second driving sub-circuit, and a control terminal connected to the light-emitting control terminal, and configured to be turned on in response to the light-emitting control signal to transmit the first power signal to the first terminal of the second driving sub-circuit.

According to an embodiment of the present disclosure, the pixel circuit further includes:

and the initialization sub-circuit is respectively connected with the reset signal end, the initialization control signal end and the first node and is used for responding to the initialization control signal and transmitting the reset signal to the first node.

According to an embodiment of the present disclosure, the initialization sub-circuit includes:

and the third transistor is connected with the reset signal end at a first end, connected with the first node at a second end, and connected with the initialization control signal end at a control end, and used for responding to the initialization control signal to be conducted so as to transmit the reset signal to the first node.

According to a second aspect of the present disclosure, there is provided a driving method of a pixel circuit, for the above pixel circuit, the driving method including:

turning on the data writing sub-circuit and turning off the light-emitting control sub-circuit by using the scanning signal and the light-emitting control signal to write the data signal into the energy storage sub-circuit;

turning off the data writing sub-circuit by using the scanning signal and the light-emitting control signal, and turning on the light-emitting control sub-circuit when the light-emitting brightness is greater than a first threshold value so as to turn on a first driving sub-circuit and a second driving sub-circuit through the data signal in the energy storage sub-circuit and drive a light-emitting element to emit light; and when the light-emitting sub-circuit is smaller than or equal to the first threshold value, the light-emitting control sub-circuit is turned off, so that the first driving sub-circuit is turned on through a data signal in the energy storage sub-circuit, and the light-emitting element is driven to emit light.

According to a third aspect of the present disclosure, there is provided a light emission control circuit including:

the pixel circuit described above;

the judging sub-circuit is used for judging whether the brightness of the light is larger than a first threshold value or not, outputting a first control signal when the brightness of the light is larger than the first threshold value, and outputting a second control signal when the brightness of the light is smaller than or equal to the first threshold value;

and the light-emitting control signal generating sub-circuit is respectively connected with the judging sub-circuit and the light-emitting control sub-circuit and is used for responding to the first control signal to generate a light-emitting control signal with the duty ratio larger than zero, responding to the second control signal to generate a light-emitting control signal with the duty ratio of zero and providing the light-emitting control signal for the light-emitting control sub-circuit.

According to an embodiment of the present disclosure, when the light emission control sub-circuit includes a second transistor, the light emission control signal generation sub-circuit is connected to a control terminal of the second transistor.

According to a fourth aspect of the present disclosure, there is provided a light emission control method for the light emission control circuit described above, the method including:

judging whether the brightness of the emitted light is larger than a first threshold value;

when the light-emitting brightness is larger than the first threshold, outputting a first control signal, and when the light-emitting brightness is smaller than or equal to the first threshold, outputting a second control signal;

generating a light emitting control signal with a duty ratio larger than zero according to the first control signal, and generating a light emitting control signal with a duty ratio of zero according to the second control signal;

and controlling light emission using the scan signal, the data signal, and the light emission control signal.

According to a fifth aspect of the present disclosure, there is provided a display device including the light emission control circuit described above.

The pixel circuit provided by the embodiment of the disclosure generates a first driving current through the first driving sub-circuit, generates a second driving current through the second driving sub-circuit, drives the light emitting element through the first driving current and the second driving current together when the luminance is high, drives the light emitting element through the first driving current when the luminance is low, performs low luminance display by reducing the driving current, and avoids the problem that the human eyes are damaged by stroboflash caused by the fact that the luminance is controlled by a low-frequency light emitting control signal when the luminance is low.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a circuit diagram of a first pixel circuit provided in an exemplary embodiment of the present disclosure;

fig. 2 is a circuit diagram of a second pixel circuit provided in an exemplary embodiment of the present disclosure;

fig. 3 is a circuit diagram of a third pixel circuit provided in an exemplary embodiment of the present disclosure;

fig. 4 is a circuit diagram of a fourth pixel circuit provided in an exemplary embodiment of the present disclosure;

fig. 5 is a driving timing diagram of a pixel circuit according to an exemplary embodiment of the present disclosure;

fig. 6 is a flowchart of a driving method of a pixel circuit according to an exemplary embodiment of the present disclosure;

fig. 7 is a circuit diagram of a lighting control circuit provided in an exemplary embodiment of the present disclosure;

fig. 8 is a flowchart of a lighting control method according to an exemplary embodiment of the present disclosure.

In the figure:

100. a first drive sub-circuit; 200. a second drive sub-circuit; 300. a data write sub-circuit; 400. a light emission control sub-circuit; 500. a tank sub-circuit; 600. initializing a sub-circuit;

10. a pixel circuit; 20. a judgment sub-circuit; 30. a light emission control signal generation sub-circuit;

DT1, a first drive transistor; DT2, a second drive transistor; t1, a first transistor; t2, a second transistor; t3, a third transistor; cst, storage capacitor.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

Furthermore, 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 give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.

The exemplary embodiments of the present disclosure first provide a pixel circuit, as shown in fig. 1, the pixel circuit including: afirst driving sub-circuit 100, asecond driving sub-circuit 200, adata writing sub-circuit 300, a lightemission control sub-circuit 400, and atank sub-circuit 500. Thefirst driving sub-circuit 100 is respectively connected to a first power terminal, a light emitting element and a first node N1, for generating a first driving current; the DATA writing sub-circuit 300 is respectively connected to the DATA signal terminal, the first node N1 and the scan signal terminal, and is configured to transmit the DATA signal DATA to the first node N1 in response to the scan signal Sn; thesecond driving sub-circuit 200 is respectively connected to the light emitting element and the first node N1 for generating a second driving current; the light-emittingcontrol sub-circuit 400 is connected to the first power terminal, thesecond driving sub-circuit 200 and the light-emitting control terminal, respectively, for transmitting the first power signal VDD to thesecond driving sub-circuit 200 in response to the light-emitting control signal EM; the first terminal of thetank sub-circuit 500 is connected to the second terminal of thedata writing sub-circuit 300, and the second terminal is connected to the first power source terminal.

The pixel circuit provided by the embodiment of the present disclosure generates a first driving current through the first drivingsub-circuit 100, generates a second driving current through thesecond driving sub-circuit 200, drives the light emitting device through the first driving current and the second driving current together when displaying luminance at a high level, drives the light emitting device through the first driving current when displaying luminance at a low level, performs low luminance display by reducing the driving current, and avoids the problem that the stroboscopic effect caused by the light emitting luminance controlled by the low-frequency light emitting control signal EM when displaying luminance at a low level is damaged.

Further, as shown in fig. 2, the pixel circuit provided in the embodiment of the present disclosure may further include aninitialization sub-circuit 600, which is respectively connected to the reset signal terminal, the initialization control signal terminal, and the first node N1, and configured to transmit the reset signal Vint to the first node N1 in response to the initialization control signal Vn. The initialization sub-circuit 600 resets the first node N1, thereby avoiding the problems of image sticking or image smearing during display.

The following will explain each constituent sub-circuit of the pixel circuit provided by the embodiments of the present disclosure in detail:

as shown in fig. 3, the first drivingsub-circuit 100 includes a first driving transistor DT1, a first terminal of the first driving transistor DT1 is connected to the first power source terminal, a second terminal of the first driving transistor DT1 is connected to the light emitting element, and a control terminal of the first driving transistor DT1 is connected to the first node N1.

Thesecond driving sub-circuit 200 includes a second driving transistor DT2, a first terminal of the second driving transistor DT2 is connected to the light emittingcontrol sub-circuit 400, a second terminal of the second driving transistor DT2 is connected to the light emitting element, and a control terminal of the second driving transistor DT2 is connected to the first node N1. A first terminal of the light emitting element is connected to the second terminal of the first driving transistor DT1 and the second terminal of the second driving transistor DT2, and a second terminal of the light emitting element is connected to the second power signal VSS.

Wherein the width-to-length ratio of the channel of the first driving transistor DT1 is smaller than the width-to-length ratio of the channel of the second driving transistor DT 2. Under the same condition, the driving current is proportional to the channel width-to-length ratio of the driving transistor, so the first driving current generated by the first driving transistor DT1 is smaller than the second driving current generated by the second driving transistor DT 2. When the display is in low brightness, the light-emitting element is driven to emit light by the first driving current, so that the phenomenon that the flash frequency is caused by reducing the light-emitting frequency in low brightness is avoided. In a possible embodiment, the length of the channel of the first driving transistor DT1 is greater than the length of the channel of the second driving transistor DT2, and the widths of the first driving transistor DT1 and the second driving transistor DT2 may be the same.

TheDATA writing sub-circuit 300 includes a first transistor T1, a first terminal of the first transistor T1 is connected to the DATA signal terminal, a second terminal of the first transistor T1 is connected to the first node N1, a control terminal of the first transistor T1 is connected to the scan signal terminal, and the first transistor T1 is turned on in response to the scan signal Sn to transmit the DATA signal DATA to the first node N1.

The lightemission control sub-circuit 400 includes a second transistor T2, a first terminal of a second transistor T2 is connected to the first power source terminal, a second terminal of a second transistor T2 is connected to the first terminal of thesecond driving sub-circuit 200, a control terminal of a second transistor T2 is connected to the light emission control terminal, and the second transistor T2 is turned on in response to the light emission control signal EM to transmit the first power source signal VDD to the first terminal of thesecond driving sub-circuit 200.

Theinitialization sub-circuit 600 includes a third transistor T3, a first terminal of the third transistor T3 is connected to the reset signal terminal, a second terminal of the third transistor T3 is connected to the first node N1, a control terminal of the third transistor T3 is connected to the initialization control signal terminal, and the third transistor T3 is turned on in response to the initialization control signal Vn to transmit the reset signal Vint to the first node N1.

The transistor in the embodiment of the present disclosure has a control terminal, a first terminal and a second terminal. Specifically, the control terminal of each transistor may be a gate, the first terminal may be a source, and the second terminal may be a drain; alternatively, the control terminal of each transistor may be a gate, the first terminal may be a drain, and the second terminal may be a source. Further, each transistor may be an enhancement transistor or a depletion transistor, which is not particularly limited in this exemplary embodiment. Thestorage sub-circuit 500 may include a storage capacitor Cst, a first terminal of the storage capacitor Cst being connected to the first node N1, and a second terminal thereof being connected to the first power signal VDD.

All the transistors can be P-type thin film transistors, and the driving voltage of each transistor is low level voltage; in this case, the first power signal VDD may be a low level signal, the second power signal VSS may be a high level signal, the first terminal of the light emitting element is a cathode of the OLED, and the second terminal of the light emitting element is an anode of the OLED.

Or, all the transistors may be N-type thin film transistors, and the driving voltage of each transistor is a high level voltage; in this case, the first power signal VDD may be a high level signal, the second power signal VSS may be a low level signal, the first terminal of the light emitting element is an anode of the OLED, and the second terminal of the light emitting element is a cathode of the OLED.

The operation of the pixel driving circuit in fig. 4 will be described in detail with reference to the operation timing diagram of the pixel driving circuit shown in fig. 5. The driving timing diagram illustrates the level states of the scan signal Sn, the emission control signal EM, the initialization control signal Vn, and the DATA signal DATA in four periods.

First time period t1 (reset phase): the initialization control signal Vn is at a low level, the emission control signal EM is at a high level, the scan signal Sn is at a high level, the third transistor T3 is turned on, the first transistor T1 and the second transistor T2 are turned off, the reset signal Vint is transmitted to the first node N1, and the control terminals of the first driving transistor DT1 and the second driving transistor DT2 realize initialization.

Second time period t2 (data writing phase): the initialization control signal Vn is at a high level, the emission control signal EM is at a high level, the scan signal Sn is at a low level, the third transistor T3 is turned off, the first transistor T1 is turned on, the second transistor T2 is turned off, and the DATA signal DATA is written in thetank sub-circuit 500.

Third period t3 (low-luminance light-emitting period): the initialization control signal Vn is at a high level, the emission control signal EM is at a high level, the scan signal Sn is at a high level, the third transistor T3 is turned off, the first transistor T1 is turned off, the second transistor T2 is turned off, the first driving transistor DT1 and the second driving transistor DT2 are turned off, the first driving transistor DT1 generates a first driving current, and the first driving current drives the light emitting element to emit light.

Fourth period t4 (high brightness lighting period): the initialization control signal Vn is at a high level, the emission control signal EM is at a low level, the scan signal Sn is at a high level, the third transistor T3 is turned off, the first transistor T1 is turned off, the second transistor T2 is turned on, the first driving transistor DT1 and the second driving transistor DT2 are turned on, the first driving transistor DT1 generates a first driving current, the second driving transistor DT2 generates a second driving current, and the first driving current and the second driving current drive the light emitting element to emit light at the same time.

It should be noted that t3 and t4 are not intended to limit the chronological order of the t3 and t4 phases, and the low-brightness display phase or the high-brightness display phase in the display phase is determined according to the actual display brightness in practical application. For example, the low-luminance display stage may be performed when the display luminance is less than a predetermined threshold, and the high-luminance display stage may be performed when the actual luminance is greater than or equal to the predetermined threshold.

It should be noted that: in the above specific embodiment, all transistors are P-type transistors; those skilled in the art will readily appreciate that pixel drive circuits provided in accordance with the present disclosure have all transistors in the N-type configuration. Of course, the pixel driving circuit provided in the present disclosure may also be replaced by a CMOS (Complementary Metal Oxide Semiconductor) circuit, etc., and is not limited to the pixel driving circuit provided in this embodiment, and will not be described herein again.

The pixel circuit provided by the embodiment of the present disclosure generates a first driving current through the first drivingsub-circuit 100, generates a second driving current through thesecond driving sub-circuit 200, drives the light emitting device through the first driving current and the second driving current together when displaying luminance at a high level, drives the light emitting device through the first driving current when displaying luminance at a low level, performs low luminance display by reducing the driving current, and avoids the problem that the stroboscopic effect caused by the light emitting luminance controlled by the low-frequency light emitting control signal EM when displaying luminance at a low level is damaged.

The exemplary embodiment of the present disclosure also provides a driving method of a pixel circuit, which is used for the above-mentioned pixel circuit, and as shown in fig. 6, the driving method includes:

step S610, turning on the DATA writing sub-circuit 300 and turning off the light-emittingcontrol sub-circuit 400 by using the scan signal Sn and the light-emitting control signal EM to write the DATA signal DATA into the energy-storingsub-circuit 500;

step S620, turning off the DATA writing sub-circuit 300 by using the scan signal Sn and the light-emitting control signal EM, and turning on the light-emittingcontrol sub-circuit 400 when the light-emitting brightness is greater than a first threshold value, so as to turn on the first drivingsub-circuit 100 and thesecond driving sub-circuit 200 by using the DATA signal DATA in the energy-storingsub-circuit 500, and drive the light-emitting element to emit light; when the light-emitting sub-circuit is less than or equal to the first threshold, the light-emittingcontrol sub-circuit 400 is turned off to turn on the first drivingsub-circuit 100 through the DATA signal DATA in the energy-storingsub-circuit 500, so as to drive the light-emitting element to emit light.

The pixel circuit driving method provided by the embodiment of the disclosure generates a first driving current through the first drivingsub-circuit 100, generates a second driving current through thesecond driving sub-circuit 200, drives the light emitting element through the first driving current and the second driving current together at high display luminance, drives the light emitting element through the first driving current at low display luminance, performs low luminance display by reducing the driving current, and avoids the damage to human eyes due to stroboscopic light caused by controlling the light emitting luminance by using the low-frequency light emitting control signal EM at low luminance display.

When the pixel circuit further includes theinitialization sub-circuit 600, the pixel circuit driving method may further include: thedata initialization sub-circuit 600 is turned on and the writing sub-circuit and the lightemission control sub-circuit 400 are turned off by the initialization control signal Vn, the scan signal Sn, and the light emission control signal EM to transmit the reset signal Vint to the first node N1.

The exemplary embodiments of the present disclosure also provide a light emission control circuit, as shown in fig. 7, including: thepixel circuit 10, thejudgment sub-circuit 20, and the light emission control signal generation sub-circuit 30 described above; thejudgment sub-circuit 20 is configured to judge whether the luminance is greater than a first threshold, output a first control signal when the luminance is greater than the first threshold, and output a second control signal when the luminance is less than or equal to the first threshold; the light emission control signal generating sub-circuit 30 is respectively connected to the determiningsub-circuit 20 and the lightemission control sub-circuit 400, and is configured to generate a light emission control signal EM with a duty ratio greater than zero in response to the first control signal, generate a light emission control signal EM with a duty ratio of zero in response to the second control signal, and provide the light emission control signal EM to the lightemission control sub-circuit 400.

The light-emitting control circuit provided by the embodiment of the disclosure judges the light-emitting brightness through the judging sub-circuit, the light-emitting control signal generating sub-circuit outputs the first light-emitting control signal or the second light-emitting control signal according to the judgment result, the light-emittingcontrol sub-circuit 400 is turned on in response to the first light-emitting control signal, and the light-emittingcontrol sub-circuit 400 is turned off in response to the second light-emitting control signal, so that the light-emitting element is driven by the first driving current and the second driving current together at high display brightness, the light-emitting element is driven by the first driving current at low display brightness, and low-brightness display is performed in a manner of reducing the driving current, thereby avoiding the problem that the light-emitting brightness is controlled by the low-frequency light-emitting control signal.

Wherein, when the lightemission control sub-circuit 400 includes the second transistor T2, the light emission control signal generation sub-circuit is connected to a control terminal of the second transistor T2. The judging sub-circuit can judge the brightness of the light through the display gray scale, and is a high-brightness display stage when the display gray scale is larger than a specified threshold value, and is a low-brightness display stage when the display gray scale is smaller than or equal to the specified threshold value.

The present disclosure also provides a light emission control method for the light emission control circuit described above, as shown in fig. 8, the method including:

step S810, judging whether the brightness is larger than a first threshold value;

step S820, outputting a first control signal when the luminance is greater than the first threshold, and outputting a second control signal when the luminance is less than or equal to the first threshold;

step S830, generating a light-emitting control signal EM with a duty ratio larger than zero according to the first control signal, and generating a light-emitting control signal EM with a duty ratio of zero according to the second control signal;

step S840, controlling light emission using the scan signal Sn, the DATA signal DATA, and the light emission control signal EM.

According to the light emission control method provided by the embodiment of the disclosure, the light emission brightness is judged through the judgment sub-circuit, the light emission control signal generation sub-circuit outputs the first light emission control signal EM or the second light emission control signal EM according to the judgment result, the lightemission control sub-circuit 400 is turned on in response to the first light emission control signal EM, and the lightemission control sub-circuit 400 is turned off in response to the second light emission control signal EM, so that the light emitting element is driven by the first driving current and the second driving current together at high display brightness, the light emitting element is driven by the first driving current at low display brightness, and low-brightness display is performed in a manner of reducing the driving current, and the problem that the human eyes are damaged due to the fact that the light emission brightness is controlled by the low-frequency light emission control signal EM.

It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.

The exemplary embodiments of the present disclosure also provide a display device including the light emission control circuit described above. The display device may include any product or component with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.

It should be noted that: the specific details of each module unit in the display device have been described in detail in the corresponding pixel driving circuit, and therefore are not described herein again.

It should be noted that although several sub-circuits of the pixel circuit and the light emission control circuit are mentioned in the above detailed description, such division is not mandatory. Indeed, the features and functions of two or more sub-circuits described above may be embodied in one sub-circuit, in accordance with embodiments of the present disclosure. Conversely, the features and functions of one sub-circuit described above may be further divided into embodiments by a plurality of sub-circuits.

As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Thus, various aspects of the invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims (13)

Translated fromChinese

1.一种像素电路，其特征在于，所述像素电路包括：1. A pixel circuit, wherein the pixel circuit comprises:第一驱动子电路，分别连接第一电源端、发光元件和第一节点，用于产生第一驱动电流；a first driving sub-circuit, connected to the first power supply terminal, the light-emitting element and the first node respectively, for generating a first driving current;数据写入子电路，分别连接数据信号端、所述第一节点和扫描信号端，用于响应扫描信号而将数据信号传输至所述第一节点；a data writing subcircuit, connected to the data signal terminal, the first node and the scan signal terminal respectively, and used for transmitting the data signal to the first node in response to the scan signal;第二驱动子电路，分别连接所述发光元件和所述第一节点，用于产生第二驱动电流；a second driving subcircuit, connected to the light-emitting element and the first node respectively, for generating a second driving current;发光控制子电路，分别连接所述第一电源端、所述第二驱动子电路和发光控制端，用于响应发光控制信号而将第一电源信号传输至第二驱动子电路，所述发光控制信号包括第一控制信号和第二控制信号，当发光亮度大于第一阈值时所述发光控制子电路接收所述第一控制信号而导通，当所述发光亮度小于等于所述第一阈值时所述发光控制子电路接收所述第二控制信号而关断；The lighting control sub-circuit is connected to the first power supply terminal, the second driving sub-circuit and the lighting control terminal respectively, and is used for transmitting the first power supply signal to the second driving sub-circuit in response to the lighting control signal. The signal includes a first control signal and a second control signal. When the light-emitting brightness is greater than a first threshold, the light-emitting control sub-circuit receives the first control signal and turns on, and when the light-emitting brightness is less than or equal to the first threshold the light-emitting control sub-circuit is turned off after receiving the second control signal;储能子电路，第一端连接于所述数据写入子电路的第二端，第二端连接于所述第一电源端。In the energy storage sub-circuit, the first end is connected to the second end of the data writing sub-circuit, and the second end is connected to the first power supply end.2.如权利要求1所述的像素电路，其特征在于，所述第一驱动子电路包括：2. The pixel circuit according to claim 1, wherein the first driving sub-circuit comprises:第一驱动晶体管，第一端连接于所述第一电源端，第二端连接于所述发光元件，控制端连接于所述第一节点；a first driving transistor, the first terminal is connected to the first power supply terminal, the second terminal is connected to the light-emitting element, and the control terminal is connected to the first node;所述第二驱动子电路包括：The second driving subcircuit includes:第二驱动晶体管，第一端连接于所述发光控制子电路，第二端连接于所述发光元件，控制端连接于所述第一节点。The second driving transistor has a first end connected to the light-emitting control sub-circuit, a second end connected to the light-emitting element, and a control end connected to the first node.3.如权利要求2所述的像素电路，其特征在于，所述第一驱动晶体管沟道的宽长比小于所述第二驱动晶体管沟道的宽长比。3 . The pixel circuit of claim 2 , wherein the width-to-length ratio of the channel of the first driving transistor is smaller than the width-to-length ratio of the channel of the second driving transistor. 4 .4.如权利要求3所述的像素电路，其特征在于，所述第一驱动晶体管沟道的长度大于所述第二驱动晶体管沟道的长度。4. The pixel circuit of claim 3, wherein the length of the channel of the first driving transistor is greater than the length of the channel of the second driving transistor.5.如权利要求1所述的像素电路，其特征在于，所述数据写入子电路包括：5. The pixel circuit of claim 1, wherein the data writing subcircuit comprises:第一晶体管，第一端连接所述数据信号端，第二端连接所述第一节点，控制端连接所述扫描信号端，用于响应所述扫描信号而导通，以将所述数据信号传输至所述第一节点。a first transistor, the first terminal is connected to the data signal terminal, the second terminal is connected to the first node, and the control terminal is connected to the scan signal terminal, and is used for being turned on in response to the scan signal to connect the data signal transmitted to the first node.6.如权利要求1所述的像素电路，其特征在于，所述发光控制子电路包括：6. The pixel circuit of claim 1, wherein the light emission control sub-circuit comprises:第二晶体管，第一端连接于所述第一电源端，第二端连接于所述第二驱动子电路的第一端，控制端连接于所述发光控制端，用于响应所述发光控制信号而导通以将所述第一电源信号传输至所述第二驱动子电路的第一端。A second transistor, the first terminal is connected to the first power supply terminal, the second terminal is connected to the first terminal of the second driving sub-circuit, and the control terminal is connected to the light-emitting control terminal for responding to the light-emitting control The signal is turned on to transmit the first power signal to the first end of the second driving sub-circuit.7.如权利要求1所述的像素电路，其特征在于，所述像素电路还包括：7. The pixel circuit of claim 1, wherein the pixel circuit further comprises:初始化子电路，分别连接复位信号端、初始化控制信号端和所述第一节点，用于响应初始化控制信号将复位信号传输至所述第一节点。The initialization sub-circuit is respectively connected to the reset signal terminal, the initialization control signal terminal and the first node, and is used for transmitting the reset signal to the first node in response to the initialization control signal.8.如权利要求7所述的像素电路，其特征在于，所述初始化子电路包括：8. The pixel circuit of claim 7, wherein the initialization subcircuit comprises:第三晶体管，第一端连接复位信号端，第二端连接第一节点，控制端连接初始化控制信号端，用于响应初始化控制信号而导通，以将复位信号传输至所述第一节点。The third transistor has a first terminal connected to the reset signal terminal, a second terminal connected to the first node, and a control terminal connected to the initialization control signal terminal for being turned on in response to the initialization control signal to transmit the reset signal to the first node.9.一种像素电路的驱动方法，其特征在于，用于权利要求1-8任一项所述的像素电路，所述驱动方法包括：9. A driving method for a pixel circuit, characterized in that it is used in the pixel circuit according to any one of claims 1-8, the driving method comprising:利用扫描信号和发光控制信号，导通数据写入子电路，关断发光控制子电路，以将数据信号写入储能子电路；Using the scanning signal and the light-emitting control signal, the data writing sub-circuit is turned on, and the light-emitting control sub-circuit is turned off, so as to write the data signal into the energy storage sub-circuit;利用所述扫描信号和所述发光控制信号，关断所述数据写入子电路，当发光亮度大于第一阈值时，导通所述发光控制子电路，以通过所述储能子电路中的所述数据信号导通第一驱动子电路和第二驱动子电路，驱动发光元件发光；当发光子电路小于等于所述第一阈值时，关断所述发光控制子电路，以通过所述储能子电路中的数据信号导通所述第一驱动子电路，驱动所述发光元件发光。Using the scan signal and the light-emitting control signal, the data writing sub-circuit is turned off, and when the light-emitting brightness is greater than the first threshold, the light-emitting control sub-circuit is turned on, so as to pass through the energy storage sub-circuit. The data signal turns on the first driving sub-circuit and the second driving sub-circuit, and drives the light-emitting element to emit light; when the light-emitting sub-circuit is less than or equal to the first threshold, the light-emitting control sub-circuit is turned off to pass the storage device. The data signal in the energy sub-circuit turns on the first driving sub-circuit and drives the light-emitting element to emit light.10.一种发光控制电路，其特征在于，所述发光控制电路包括：10. A lighting control circuit, characterized in that the lighting control circuit comprises:权利要求1-8任一项所述的像素电路；The pixel circuit of any one of claims 1-8;判断子电路，用于判断发光亮度是否大于第一阈值，当所述发光亮度大于所述第一阈值时输出第一控制信号，当所述发光亮度小于等于所述第一阈值时输出第二控制信号；a judging sub-circuit for judging whether the light-emitting brightness is greater than a first threshold, outputting a first control signal when the light-emitting brightness is greater than the first threshold, and outputting a second control signal when the light-emitting brightness is less than or equal to the first threshold Signal;发光控制信号生成子电路，分别和所述判断子电路以及发光控制子电路连接，用于响应所述第一控制信号而产生占空比大于零的发光控制信号，响应所述第二控制信号产生占空比为零的发光控制信号，并将所述发光控制信号提供给所述发光控制子电路。A light-emitting control signal generating sub-circuit is connected to the judgment sub-circuit and the light-emitting control sub-circuit respectively, and is used for generating a light-emitting control signal with a duty cycle greater than zero in response to the first control signal, and generating a light-emitting control signal in response to the second control signal A light-emitting control signal with zero duty cycle is provided to the light-emitting control sub-circuit.11.如权利要求10所述的发光控制电路，其特征在于，当所述发光控制子电路包括第二晶体管时，所述发光控制信号生成子电路连接于所述第二晶体管的控制端。11 . The lighting control circuit of claim 10 , wherein when the lighting control sub-circuit comprises a second transistor, the lighting control signal generating sub-circuit is connected to a control terminal of the second transistor. 12 .12.一种发光控制方法，其特征在于，用于权利要求10或11所述的发光控制电路，所述方法包括：12. A light-emitting control method, characterized in that it is used in the light-emitting control circuit of claim 10 or 11, the method comprising:判断发光亮度是否大于第一阈值；judging whether the luminous brightness is greater than a first threshold;当所述发光亮度大于所述第一阈值时输出第一控制信号，当所述发光亮度小于等于所述第一阈值时，输出第二控制信号；When the light-emitting brightness is greater than the first threshold, output a first control signal, and when the light-emitting brightness is less than or equal to the first threshold, output a second control signal;根据所述第一控制信号产生占空比大于零的发光控制信号，根据所述第二控制信号产生占空比为零的发光控制信号；generating a light-emitting control signal with a duty cycle greater than zero according to the first control signal, and generating a light-emitting control signal with a zero duty cycle according to the second control signal;利用扫描信号、数据信号和所述发光控制信号控制发光。The light emission is controlled by using the scan signal, the data signal and the light emission control signal.13.一种显示装置，其特征在于，所述显示装置包括权利要求10或11所述的发光控制电路。13. A display device, characterized in that, the display device comprises the light-emitting control circuit of claim 10 or 11.

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