阅读说明：本技术 像素驱动电路、方法及显示面板 (Pixel driving circuit, method and display panel ) 是由 冯宏庆 米磊 李洪瑞 盖翠丽 解红军 丁立薇 于 2020-05-15 设计创作，主要内容包括：本申请提供了一种像素驱动电路、方法及显示面板,涉及显示技术领域。该像素驱动电路包括子像素电路和补偿模块,补偿模块与数据线电连接；子像素电路包括开关模块、存储模块、驱动模块、感应模块和发光器件；其中,开关模块与扫描线、数据线、存储模块连接,存储模块与驱动模块连接,驱动模块与高电平输入端、感应模块、发光器件连接,感应模块与数据线、感应线、发光器件连接；在补偿阶段,补偿模块接收驱动模块的输出信号,根据输出信号和预存的驱动模块工作参数,得到驱动模块的阈值电压,调节数据信号的电压至目标电压值,目标电压值为调节前的数据信号的电压与阈值电压的加和。利用本申请的技术方案能够提高显示面板的显示效果。(The application provides a pixel driving circuit, a pixel driving method and a display panel, and relates to the technical field of display. The pixel driving circuit comprises a sub-pixel circuit and a compensation module, wherein the compensation module is electrically connected with the data line; the sub-pixel circuit comprises a switch module, a storage module, a driving module, an induction module and a light-emitting device; the switch module is connected with the scanning line, the data line and the storage module, the storage module is connected with the driving module, the driving module is connected with the high-level input end, the induction module and the light-emitting device, and the induction module is connected with the data line, the induction line and the light-emitting device; in the compensation stage, the compensation module receives the output signal of the driving module, obtains the threshold voltage of the driving module according to the output signal and the prestored working parameters of the driving module, and adjusts the voltage of the data signal to a target voltage value, wherein the target voltage value is the sum of the voltage of the data signal before adjustment and the threshold voltage. The technical scheme of the application can improve the display effect of the display panel.)

1. A pixel driving circuit is characterized by comprising sub-pixel circuits and a compensation module, wherein each sub-pixel circuit is arranged corresponding to each sub-pixel region, each sub-pixel region is defined by a plurality of scanning lines and a plurality of data lines in a staggered mode, and the compensation module is electrically connected with the data lines;

the sub-pixel circuit comprises a switch module, a storage module, a driving module, an induction module and a light-emitting device; the switch module is connected with the scanning line, the data line and the storage module, the storage module is connected with the driving module, the driving module is connected with a high-level input end, the induction module and the light-emitting device, the induction module is connected with the data line, the induction line and the light-emitting device, and the light-emitting device is connected with a low-level input end;

in a compensation stage, the switch module, the driving module and the sensing module are switched on, an output signal of the driving module is transmitted to the compensation module through the sensing module and the data line, the compensation module obtains a threshold voltage of the driving module according to the output signal and prestored working parameters of the driving module, and adjusts the voltage of a data signal provided by the data line to a target voltage, wherein the target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage.

2. The pixel driving circuit according to claim 1, wherein the driving module comprises a first transistor;

the control end of the first transistor is connected with the output end of the switch module and the first end of the storage module, the first end of the first transistor is connected with the high-level input end and the second end of the storage module, and the second end of the first transistor is connected with the input end of the induction module and the anode of the light-emitting device.

3. The pixel driving circuit according to claim 1, wherein the switching module comprises a second transistor;

the control end of the second transistor is connected with the scanning line, the first end of the second transistor is connected with the data line, and the second end of the second transistor is connected with the first end of the storage module and the control end of the driving module.

4. The pixel driving circuit according to claim 1, wherein the sensing module comprises a third transistor;

a control end of the third transistor is connected to a sensing line, a first end of the third transistor is connected to the output end of the driving module and the anode of the light emitting device, and a second end of the third transistor is connected to the data line.

5. The pixel driving circuit according to claim 1, wherein the storage module comprises an energy storage capacitor;

the first end of the energy storage capacitor is connected with the control end of the driving module and the output end of the switch module, and the second end of the energy storage capacitor is connected with the input end of the driving module.

6. The pixel driving circuit according to claim 1, wherein the data signal provided by the data line is the same as the sensing signal provided by the sensing line.

7. The pixel driving circuit according to claim 1, wherein the sub-pixel circuit further comprises a light emission control module, the driving module is connected with a light emitting device through the light emission control module, and the light emission control module is connected with a light emission control line;

the light emitting control module comprises a fourth transistor, a control end of the fourth transistor is connected with the light emitting control line, a first end of the fourth transistor is connected with an output end of the driving module and an input end of the induction module, and a second end of the fourth transistor is connected with an anode of the light emitting device.

8. A pixel driving method applied to the pixel driving circuit according to any one of claims 1 to 7, the method comprising:

receiving an output signal of the driving module through the sensing module;

obtaining the threshold voltage of the driving module by using the output signal and prestored working parameters of the driving module;

and adjusting the voltage of the data signal provided by the data line to a target voltage, wherein the target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage.

9. A display panel comprising a plurality of data lines, a plurality of scan lines, a plurality of sense lines, and the pixel driving circuit according to any one of claims 1 to 7.

10. The display panel according to claim 9, wherein the data line is multiplexed into the sense line.

Technical Field

The present application relates to the field of display technologies, and in particular, to a pixel driving circuit, a pixel driving method, and a display panel.

Background

In the display panel, the pixel driving circuit is used for driving the sub-pixel units to realize the display of the display panel. The pixel driving circuit may include a plurality of devices, wherein characteristics of the devices may have an influence on a display effect of the display panel. For example, the characteristics of transistors in different circuits driving different sub-pixel units are different, so that the magnitude of driving current driving different sub-pixel units is different, display unevenness is caused, mura is generated, and the display effect of the display panel is reduced.

Disclosure of Invention

The embodiment of the application provides a pixel driving circuit, a pixel driving method and a display panel, which can improve the display effect of the display panel.

In a first aspect, an embodiment of the present application provides a pixel driving circuit, including sub-pixel circuits and a compensation module, where each sub-pixel circuit is disposed corresponding to each sub-pixel region, the sub-pixel regions are defined by a plurality of scan lines and a plurality of data lines, which are interlaced with each other, and the compensation module is electrically connected to the data lines;

the sub-pixel circuit comprises a switch module, a storage module, a driving module, an induction module and a light-emitting device; the switch module is connected with the scanning line, the data line and the storage module, the storage module is connected with the drive module, the drive module is connected with the high-level input end, the induction module and the light-emitting device, the induction module is connected with the data line, the induction line and the light-emitting device, and the light-emitting device is connected with the low-level input end;

in the compensation stage, the switch module, the driving module and the sensing module are conducted, an output signal of the driving module is transmitted to the compensation module through the sensing module and the data line, the compensation module obtains the threshold voltage of the driving module according to the output signal and the prestored working parameters of the driving module, the voltage of the data signal provided by the data line is adjusted to the target voltage, and the target voltage value is the sum of the voltage of the data signal before adjustment and the threshold voltage.

According to a first aspect of embodiments of the present application, a driving module includes a first transistor;

the control end of the first transistor is connected with the output end of the switch module and the first end of the storage module, the first end of the first transistor is connected with the high-level input end and the second end of the storage module, and the second end of the first transistor is connected with the input end of the induction module and the anode of the light-emitting device.

According to a first aspect of embodiments of the present application, a switching module includes a second transistor;

the control end of the second transistor is connected with the scanning line, the first end of the second transistor is connected with the data line, and the second end of the second transistor is connected with the first end of the storage module and the control end of the driving module.

According to a first aspect of embodiments of the present application, the sensing module comprises a third transistor;

the control end of the third transistor is connected with the sensing line, the first end of the third transistor is connected with the output end of the driving module and the anode of the light-emitting device, and the second end of the third transistor is connected with the data line.

According to a first aspect of embodiments of the present application, a storage module includes an energy storage capacitor;

the first end of the energy storage capacitor is connected with the control end of the driving module and the output end of the switch module, and the second end of the energy storage capacitor is connected with the input end of the driving module.

According to the first aspect of the embodiments of the present application, the data signal provided by the data line is the same as the sensing signal provided by the sensing line.

According to the first aspect of the embodiment of the present application, the sub-pixel circuit further includes a light emission control module, the driving module is connected to the light emitting device through the light emission control module, and the light emission control module is connected to the light emission control line;

the light-emitting control module comprises a fourth transistor, a control end of the fourth transistor is connected with the light-emitting control line, a first end of the fourth transistor is connected with an output end of the driving module and an input end of the induction module, and a second end of the fourth transistor is connected with an anode of the light-emitting device.

In a second aspect, an embodiment of the present application provides a pixel driving method, which is applied to the pixel driving circuit in the technical solution of the first aspect, and the pixel driving method includes:

receiving an output signal of a driving module passing through a sensing module;

obtaining the threshold voltage of the driving module by utilizing the output signal and the prestored working parameters of the driving module;

and adjusting the voltage of the data signal provided by the data line to a target voltage, wherein the target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage.

In a third aspect, an embodiment of the present application provides a display panel, which includes a plurality of data lines, a plurality of scan lines, a plurality of sense lines, and the pixel driving circuit in the technical solution of the first aspect.

According to a third aspect of embodiments of the present application, the data lines are multiplexed into sense lines.

The embodiment of the application provides a pixel driving circuit, a pixel driving method and a display panel. The sub-pixel circuit comprises a switch module, a storage module, a driving module, an induction module and a light-emitting device. In the compensation stage, the sensing module, the switch module and the driving module are conducted, an output signal of the driving module is transmitted to the compensation module through the sensing module and the data line, and the compensation module obtains the threshold voltage of the driving module according to the output signal and the prestored working parameters of the driving module. The compensation module may adjust a voltage of the data signal provided by the data line to a target voltage, which is a sum of the voltage of the data signal before adjustment and the threshold voltage. Because the characteristic difference of different sub-pixel circuits driving different sub-pixel regions is embodied as the threshold voltage of the driving module, the data signal with the regulated voltage as the target voltage is input into the sub-pixel circuits, the characteristic difference of the sub-pixel circuits can be eliminated, so that each sub-pixel region of the display panel can be uniformly displayed, and the display effect of the display panel is improved.

Drawings

The present application will be better understood from the following description of specific embodiments of the invention taken in conjunction with the accompanying drawings. Wherein like or similar reference numerals refer to like or similar features.

Fig. 1 is a schematic diagram of a sub-pixel region according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a sub-pixel circuit according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a sub-pixel circuit according to another embodiment of the present disclosure;

FIG. 4 is a timing diagram of the sub-pixel circuit of FIG. 3;

FIG. 5 is a schematic diagram of a sub-pixel circuit according to another embodiment of the present application;

FIG. 6 is a schematic diagram of a sub-pixel circuit according to yet another embodiment of the present application;

fig. 7 is a flowchart of a pixel driving method according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

The embodiment of the application provides a pixel driving circuit, which can comprise a sub-pixel circuit P10 and a compensation module P15. Here, each sub-pixel circuit P10 is provided corresponding to each sub-pixel region a 1. That is, the sub-pixel circuits P10 are provided in correspondence with the sub-pixel regions a 1. The sub-pixel region a1 is defined by a plurality of Scan lines Scan and a plurality of Data lines Data being interleaved with each other. The compensation module P15 is electrically connected to a plurality of Data lines Data. For example, fig. 1 is a schematic diagram of a sub-pixel region a1 according to an embodiment of the present disclosure. As shown in fig. 1, the plurality of Scan lines Scan and the plurality of Data lines Data, which are crisscrossed, define a plurality of sub-pixel regions a1, and each sub-pixel region a1 may be provided with a sub-pixel circuit P10 in the embodiment of the present application. The compensation module P15 is electrically connected to the Data line Data. It should be noted that, corresponding to the plurality of sub-pixel circuits P10, one compensation module P15 may be provided, or a plurality of compensation modules P15 may be provided, which is not limited herein. In some examples, the compensation module P15 may be an Integrated Circuit (IC) Integrated with the compensation module P15 in the embodiment of the present application, or may be a functional unit installed in the IC, which is not limited herein.

Fig. 2 is a schematic structural diagram of a sub-pixel circuit P10 according to an embodiment of the present disclosure. As shown in fig. 2, the sub-pixel circuit P10 may include a switching module P11, a memory module P12, a driving module P13, a sensing module P14, and a light emitting device D1.

The switch module P11 is connected to the Scan line Scan, the Data line Data, and the memory module P12. The memory module P12 is connected to the driving module P13. The driving module P13 is connected to the high level input terminal VDD, the sensing module P14 and the light emitting device D1. The sensing module P14 is connected to the Data line Data, the sensing line Sense, and the light emitting device D1. The light emitting device D1 is connected to the low level input terminal VSS.

Wherein the Scan line Scan is used for providing a Scan signal. The scan signal may control the switching module P11 to be turned on or off. The Data lines Data are used to supply Data signals. The data signal may control the driving module P13 to turn on or off. The sensing line Sense is used to provide a sensing signal. The sensing signal is used to control the on or off of the sensing module P14. The high level input terminal VDD is used to provide a high level signal. The low level input terminal VSS is used to provide a low level signal. In some examples, the low-level signal terminal may be a ground terminal, but is not limited thereto. For example, the high level signal provided by the high level input terminal VDD may have a voltage of 7V. The voltage of the low level signal provided by the low level input terminal VSS may be 0V.

In some examples, the Data signal provided by the Data line Data and the sensing signal provided by the sensing line Sense may be the same, i.e., one signal may be used as both the Data signal and the sensing signal. Furthermore, the Data line Data can be reused as the sensing line Sense, so that the wiring complexity in the display panel is reduced, the wiring number required by the driving IC is reduced, and the structure of the display panel is simplified.

In the compensation phase, the sensing module P14 receives the sensing signal and is turned on according to the sensing signal. The switch module P11 receives the scan signal and is turned on according to the scan signal. The switching module P11 is turned on to transmit the data signal to the driving module P13. The driving module P13 receives the data signal and is turned on according to the data signal. The output signal of the driving module P13 is the driving signal passing through the driving module P13, and the output signal can be transmitted to the Data line Data through the sensing module P14, so that the compensating module P15 can receive the output signal of the driving module P13 from the Data line Data. The compensation module P15 may have the operating parameters of the driving module P13 pre-stored therein. Specifically, the operating parameters of the driving module P13 may include characteristic parameters of devices in the driving module P13. The output signal of the driving module P13, the operating parameter of the driving module P13, and the threshold voltage of the driving module P13 have a functional relationship, and the compensation module P15 can calculate the threshold voltage of the driving module P13 according to the output signal of the driving module P13 and the operating parameter of the driving module P13. The characteristic difference of the different sub-pixel circuits P10 driving the different sub-pixel regions a1 is represented by the threshold voltage of the driving module P13. The compensation module P15 may adjust the voltage of the Data signal provided by the Data line Data to a target voltage. The target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage. For example, the threshold voltage is Vth, the voltage of the Data signal before adjustment supplied from the Data line Data is Vdata, and the voltage of the Data signal after adjustment supplied from the Data line Data is Vdata + Vth.

The sum of the resistance of the Data line Data and the resistance of the sensing module P14 is smaller than the resistance of the light emitting device D1, so that when the sensing module P14 is turned on, the output signal of the driving module P13 does not pass through the light emitting device D1.

In the write phase, the sensing module P14 receives the sensing signal and turns off according to the sensing signal. The switch module P11 receives the scan signal and is turned on according to the scan signal. The switch module P11 is turned on to transmit the adjusted data signal to the memory module P12, and the adjusted data signal is written into the memory module P12, i.e., the memory module P12 is charged with the adjusted data signal.

In the lighting phase, the sensing module P14 receives the sensing signal and turns off according to the sensing signal. The switch module P11 receives the scan signal and turns off according to the scan signal. The storage module P12 transmits the power stored during the write phase to the drive module P13. The voltage of the power stored by the memory module P12 in the write phase is the same as the voltage of the conditioned data signal. The driving module P13 receives the power transmitted by the storage module P12, and is turned on according to the power transmitted by the storage module P12, and a high level signal of the high level input terminal VDD is transmitted to the light emitting device D1 through the driving module P13, so that the light emitting device D1 emits light.

Since the driving module P13 receives the adjusted data signal, the adjusted data signal is obtained by the compensation module P15 according to the threshold voltage of the driving module P13, that is, the compensation module P15 performs compensation adjustment from the outside of the sub-pixel circuit P10, so as to make up for the characteristic difference of the different sub-pixel circuits P10 driving the different sub-pixel regions a1, and the driving current in each sub-pixel circuit P10, that is, the current of the output signal of the driving module P13, is consistent or tends to be consistent, so that each sub-pixel region a1 of the display panel displays uniformly, thereby improving the display effect of the display panel.

It should be noted that the compensation stage may be set in each image frame, or may be set at intervals of multiple image frames, which is not limited herein. The compensation module P15 can obtain the driving current quickly to realize real-time compensation.

In the embodiment of the present application, the pixel driving circuit includes a sub-pixel circuit P10 and a compensation module P15. The sub-pixel circuit P10 includes a switching module P11, a memory module P12, a driving module P13, a sensing module P14, and a light emitting device D1. In the compensation phase, the sensing module P14, the switching module P11 and the driving module P13 are turned on, and the output signal of the driving module P13 is transmitted to the compensation module P15 through the sensing module P14 and the Data line Data. The compensation module P15 obtains the threshold voltage of the driving module P13 according to the output signal and the pre-stored operating parameters of the driving module P13. The compensation module P15 may adjust the voltage of the Data signal provided by the Data line Data to a target voltage. The target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage. Since the characteristic difference of the different sub-pixel circuits P10 driving the different sub-pixel regions a1 is represented as the threshold voltage of the driving module P13, and the data signal with the adjusted voltage as the target voltage is input to the sub-pixel circuit P10, the characteristic difference of the sub-pixel circuit P10 can be eliminated, so that the sub-pixel regions a1 of the display panel can display uniformly, and the display effect of the display panel is improved.

Moreover, the sub-pixel circuit P10 in the pixel driving circuit in the embodiment of the present application has a simpler structure and occupies a smaller space than the sub-pixel circuit P10 in the related art, which can perform compensation internally, and is more suitable for a display panel with high resolution or high pixel density (Pixels Per inc, PPI).

Fig. 3 is a schematic structural diagram of a sub-pixel circuit P10 according to another embodiment of the present disclosure. Fig. 3 is different from fig. 2 in that the driving module P13 shown in fig. 3 includes a first transistor T1, the switching module P11 includes a second transistor T2, the sensing module P14 includes a third transistor T3, and the storage module P12 includes an energy storage capacitor C1. The transistor may be a P-type transistor or an N-type transistor, which is not limited herein. The control end of the transistor is a grid electrode, the first end of the transistor is a source electrode, and the second end of the transistor is a drain electrode; alternatively, the control terminal of the transistor is a gate, the first terminal is a drain, and the second terminal is a source, which is not limited herein. For convenience of explanation, the following description will be given taking a case where the transistor is a P-type transistor.

A control terminal of the first transistor T1 is connected to the output terminal of the switch module P11 and the first terminal of the memory module P12, a first terminal of the first transistor T1 is connected to the high level input terminal VDD and the second terminal of the memory module P12, and a second terminal of the first transistor T1 is connected to the input terminal of the sensing module P14 and the anode of the light emitting device D1.

The control terminal of the second transistor T2 is connected to the Scan line Scan, the first terminal of the second transistor T2 is connected to the Data line Data, and the second terminal of the second transistor T2 is connected to the first terminal of the memory module P12 and the control terminal of the driving module P13.

A control terminal of the third transistor T3 is connected to the Sense line Sense, a first terminal of the third transistor T3 is connected to the output terminal of the driving module P13 and the anode of the light emitting device D1, and a second terminal of the third transistor T3 is connected to the Data line Data.

The first end of the energy storage capacitor C1 is connected to the control end of the driving module P13 and the output end of the switching module P11, and the second end of the energy storage capacitor C1 is connected to the input end of the driving module P13.

The cathode of the light emitting device D1 is connected to the low level input terminal VSS.

The control terminal of the driving module P13 is the control terminal of the first transistor T1, the input terminal of the driving module P13 is the first terminal of the first transistor T1, and the output terminal of the driving module P13 is the second terminal of the first transistor T1. The control terminal of the switch module P11 is the control terminal of the second transistor T2, the input terminal of the switch module P11 is the first terminal of the second transistor T2, and the output terminal of the switch module P11 is the second terminal of the second transistor T2. The control terminal of the sensing module P14 is the control terminal of the third transistor T3, the input terminal of the sensing module P14 is the first terminal of the third transistor T3, and the output terminal of the sensing module P14 is the second terminal of the third transistor T3.

The sub-pixel circuit P10 in the pixel driving circuit in the embodiment of the application comprises three transistors and a capacitor, namely a 3T1C circuit, and has the advantages of simple structure and small occupied space. Compared with a sub-pixel circuit which requires at least seven transistors and one capacitor for internal compensation, the pixel circuit has the advantages of fewer transistors, smaller occupied space, easier layout and better suitability for a display panel with high resolution or high pixel density (Pixels Per Inc, PPI).

The operation principle of the pixel driving circuit in the embodiment of the present application will be specifically described below by taking the sub-pixel circuit P10 shown in fig. 3 in which the transistors are P-type transistors as an example. Fig. 4 is a timing diagram of the sub-pixel circuit P10 of fig. 3.

In the compensation period T1, the scan signal is low, and the second transistor T2 is turned on. The sensing signal is low, and the third transistor T3 is turned on. The data signal turns on the first transistor T1. The sum of the resistance of the Data line Data and the resistance of the third transistor T3 is smaller than the resistance of the first transistor T1, and the voltage drops of the high level signal and the Data signal at the high level signal terminal are all distributed over the first transistor T1. The first transistor T1 is in saturation, and the driving current flowing through the first transistor T1 can be obtained by the following equation (1):

wherein I is the driving current, mu is the carrier mobility, Cox is the cross-sectional capacitance of the gate insulating layer,vgs is the gate-source voltage difference and Vth is the threshold voltage for driving the width-to-length ratio of the transistor. The carrier mobility and the cross-sectional capacitance of the gate insulating layer are both working parameters of the driving module P13. Gate-source of the first transistor T1The voltage difference is equal to the difference between the voltage of the data signal transmitted to the control terminal of the first transistor T1 and the voltage of the high level signal.

Since the sum of the resistance of the Data line Data and the resistance of the third transistor T3 is less than the resistance of the light emitting device D1, the driving current is transmitted to the Data line Data through the first transistor T1 and the third transistor T3, and transmitted to the compensation module P15 through the Data line Data, and does not flow through the light emitting device D1. The compensation module P15 may store the program for implementing the above equation (1) in advance by burning or other methods, and calculate the threshold voltage Vth according to the driving current transmitted from the Data line Data by using the pre-stored working parameters of the driving module P13. The compensation module P15 adjusts the voltage of the Data signal provided by the Data line Data to increase the voltage of the Data signal by the threshold voltage Vth, and if the voltage of the Data signal is Vdata, the adjusted voltage of the Data signal is Vdata + Vth.

In the write phase T2, the sensing signal is high, and the third transistor T3 is turned off. The scan signal is low, and the second transistor T2 is turned on. The data signal at this time is a regulated data signal, and the voltage of the regulated data signal is Vdata + Vth. The conditioned data signal charges the energy storage capacitor C1.

In the light-emitting period T3, the sensing signal is at a high level, and the third transistor T3 is turned off. The scan signal is high and the second transistor T2 is turned off. The energy storage capacitor C1 can keep the voltage of the control terminal of the first transistor T1 at Vdata + Vth, and the first transistor T1 is turned on and in saturation. At this time, the driving current is expressed by equation (2):

from equation (2), the driving current is no longer affected by the threshold voltage, and the characteristic difference of the sub-pixel circuits P10 is eliminated, so that the sub-pixel regions a1 of the display panel are uniformly displayed, and the display effect of the display panel is improved.

It should be noted that, if the transistor is an N-type transistor, the first terminal of the energy storage capacitor C1 is connected to the control terminal of the first transistor T1 and the second terminal of the second transistor T2, and the second terminal of the energy storage capacitor C1 is connected to the second terminal of the first transistor T1. The high and low levels of the sensing signal, the data signal, the scanning signal, etc. are adjusted accordingly, and are not described herein again.

Fig. 5 is a schematic structural diagram of a sub-pixel circuit P10 according to yet another embodiment of the present application. Fig. 5 is different from fig. 2 in that the sub-pixel circuit P10 shown in fig. 5 may further include a light emission control block P16. As shown in fig. 5, the driving module P13 in the above embodiment may be connected to the light emitting device D1 through the light emitting control module P16. The emission control module P16 is connected to an emission control line EM. The emission control line EM provides an emission control signal, and the emission control module P16 may be turned on or off according to the emission control signal.

In the compensation stage and the writing stage, the light emitting control module P16 is turned off, so that the driving current can be prevented from flowing through the light emitting device D1, the black state brightness is reduced, and the contrast is improved. In the light emitting stage, the light emitting control module P16 is turned on to allow a driving current to flow through the light emitting device D1, so that the light emitting device D1 emits light.

Fig. 6 is a schematic structural diagram of a sub-pixel circuit P10 according to yet another embodiment of the present application. Fig. 6 is different from fig. 5 in that the light emission control module P16 shown in fig. 6 includes a fourth transistor T4. The following description will be given taking a P-type transistor as an example.

A control terminal of the fourth transistor T4 is connected to the emission control line EM, a first terminal of the fourth transistor T4 is connected to the output terminal of the driving block P13 and the input terminal of the sensing block P14, and a second terminal of the fourth transistor T4 is connected to the anode of the light emitting device D1.

In the compensation phase, the light emitting control signal is at a high level, and the fourth transistor T4 is turned off.

In the writing phase, the light emitting control signal is at a high level, and the fourth transistor T4 is turned off. In the writing stage, current can be prevented from flowing through the light-emitting device D1 in the process of writing the data signal into the energy storage capacitor C1, so that the black state brightness is reduced, the display contrast of the display panel can be improved, and the display effect is improved.

In the light emitting period, the light emitting control signal is at a low level, the fourth transistor T4 is turned on, and the light emitting device D1 emits light.

Corresponding to the pixel driving circuit in the above embodiment, the embodiment of the present application further provides a pixel driving method, which can be applied to the pixel driving circuit in the above embodiment. Fig. 7 is a flowchart of a pixel driving method according to an embodiment of the present application. As shown in fig. 7, the pixel driving method may include steps S201 to S203.

In step S201, an output signal of the driving module passing through the sensing module is received.

The output signal of the driving module is the driving current.

In step S202, the output signal and the pre-stored working parameters of the driving module are used to obtain the threshold voltage of the driving module.

The driving current, the working parameters of the driving module and the threshold voltage of the driving module have a functional relation, and the threshold voltage of the driving module can be obtained through calculation according to the output signals, namely the driving current and the working parameters of the driving module.

In step S203, the voltage of the data signal supplied from the data line is adjusted to a target voltage.

The target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage. The voltage of the data signal provided by the data line is increased by the threshold voltage, the influence of the threshold voltage on the driving current is eliminated, and the characteristic difference of different sub-pixel circuits driving different sub-pixel areas is made up.

The specific contents of step S201 to step S203 can refer to the related descriptions in the above embodiments, and are not described herein again.

In the embodiment of the application, the output signal of the driving module transmitted by the sensing module can be received from the data line, and the threshold voltage of the driving module can be obtained according to the output signal and the prestored working parameters of the driving module. The voltage of the data signal provided by the data line is adjusted to a target voltage. The target voltage is the sum of the voltage of the data signal before adjustment and the threshold voltage. Because the characteristic difference of different sub-pixel circuits driving different sub-pixel areas is embodied as the threshold voltage of the driving module, the data signal with the voltage adjusted to the target voltage is input into the sub-pixel circuit, the influence of the threshold voltage on the driving current in the sub-pixel circuit can be eliminated, so that the characteristic difference of display of each sub-pixel area is eliminated, the display of each sub-pixel area of the display panel is uniform, and the display effect of the display panel is improved.

The embodiment of the application also provides a display panel. The display panel comprises a plurality of data lines, a plurality of scanning lines, a plurality of sensing lines and the pixel driving circuit in the embodiment. A plurality of scanning lines and a plurality of data lines in the display panel are arranged in a crisscross mode, and a plurality of sub-pixel areas are limited and obtained. The drive current in the sub-pixel circuit of the display panel in the embodiment of the application is not influenced by the threshold voltage, the display of each sub-pixel area is uniform, and the overall display effect is improved.

In some examples, the data lines can be reused as the sensing lines, so that the number of wiring in the display panel is reduced, and the wiring difficulty of the display panel is reduced. Correspondingly, the requirement that the driving IC is provided with interfaces for connecting each signal line and channels for receiving signals can be reduced, the design difficulty of the display panel is reduced, and the structure of the display panel is simplified.

The embodiment of the application also provides a display device. The display device may include the display panel in the above embodiments. The display device may be, but is not limited to, a device with a display function, such as a mobile phone, a computer, a tablet computer, a digital photo frame, a television, and electronic paper.

It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the driving method embodiment, the display panel embodiment and the display device embodiment, relevant points can be referred to the description part of the pixel driving circuit embodiment. The present application is not limited to the particular structures described above and shown in the figures. Those skilled in the art may make various changes, modifications and additions after comprehending the spirit of the present application. The embodiments were chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application and its various modifications as are suited to the particular use contemplated.