Brightness compensation method of display panel and display panel

Abstract

The embodiment of the present application discloses a display panel brightness compensation method and display panel, by obtaining the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale data, determining the compensation coefficient corresponding to each sub-pixel according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel, and then performing brightness compensation on the sub-pixel according to the compensation coefficient corresponding to the sub-pixel. The technical scheme of the present application considers both the influence of the change of the total current on the brightness of the sub-pixel of the same display gray scale caused by the change of the out-of-plane resistance voltage division and the influence of the change of the total current on the brightness of the sub-pixel of different display gray scales under the same frame display picture, realizes the brightness compensation of the sub-pixel by the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel, reduces the brightness difference of the sub-pixel corresponding to the same display gray scale caused by the change of the voltage division on the out-of-plane resistance when the total current changes due to the change of the display picture, and improves the picture display effect.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, in particular to a brightness compensation method of display panel and display panel. BACKGROUND

[0002] With the development of display technology, users have higher and higher requirements on the picture display effect of display panel.

[0003] In the existing display panel, under different display pictures, there is a difference in the brightness of the sub-pixels corresponding to the same display gray scale in the display panel, which affects the picture display effect. SUMMARY

[0004] The present application provides a brightness compensation method of display panel and display panel to compensate for the brightness difference of the sub-pixels corresponding to the same display gray scale caused by different display pictures, and improve the picture display effect.

[0005] In a first aspect, embodiments of the present application provide a brightness compensation method of display panel, comprising:

[0006] obtaining total current corresponding to a to-be-displayed picture and to-be-displayed gray scale data; wherein the display panel comprises a plurality of sub-pixels, a first power bus and a second power bus connected to the sub-pixels, and the total current is the current on the first power bus or the second power bus; the to-be-displayed gray scale data comprises to-be-displayed gray scales of each sub-pixel in the display panel;

[0007] determining a compensation coefficient corresponding to each sub-pixel according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel;

[0008] compensating the brightness of the sub-pixel according to the compensation coefficient corresponding to the sub-pixel.

[0009] Optionally, the display panel comprises at least two kinds of monochromatic sub-pixels of different light-emitting colors, and the total current corresponding to the to-be-displayed picture comprises the total current corresponding to the monochromatic sub-pixels of different light-emitting colors under the to-be-displayed picture;

[0010] The first power bus comprises at least two first sub-power buses insulated from each other, wherein the monochromatic sub-pixels of different light-emitting colors are connected to different first power sources through different first sub-power buses; and the total current corresponding to the monochromatic sub-pixels under the to-be-displayed picture is the current on the first sub-power bus connected to the monochromatic sub-pixels;

[0011] And / or, the second power bus comprises at least two second sub-power buses insulated from each other, wherein the monochromatic sub-pixels of different light-emitting colors are connected to different second power sources through different second sub-power buses; and the total current corresponding to the monochromatic sub-pixels under the to-be-displayed picture is the current on the second sub-power bus connected to the monochromatic sub-pixels.

[0012] Optionally, the first power bus and the second power bus are located in a non-display area of the display panel.

[0013] Optionally, for any single-color sub-pixel of a light-emitting color, before determining the compensation coefficient corresponding to the single-color sub-pixel according to the total current corresponding to a to-be-displayed picture and a to-be-displayed gray scale of the sub-pixel, the method further comprises:

[0014] determining, under a set display brightness value, a brightness relationship between display brightness of single-color sub-pixels corresponding to a preset display gray scale in a plurality of preset display pictures and reference display brightness corresponding to the single-color sub-pixels in a reference display picture under the preset display gray scale; wherein, in the reference display picture under the preset display gray scale, the display gray scale of the single-color sub-pixels of the same light-emitting color is the preset display gray scale; and in the preset display picture, the display gray scale of the single-color sub-pixels of the same light-emitting color includes the preset display gray scale and other display gray scales.

[0015] determining, according to the brightness relationship, a compensation coefficient corresponding to the single-color sub-pixel corresponding to the preset display gray scale under the total current of the preset display picture;

[0016] storing the compensation coefficient corresponding to the single-color sub-pixel corresponding to the preset display gray scale under the total current of the preset display picture;

[0017] wherein, the brightness relationship is related to an out-of-plane resistance of the display panel, an in-plane resistance of the display panel in the reference display picture, and a total current corresponding to the single-color sub-pixel in the reference display picture under the preset display gray scale and a total current corresponding to the single-color sub-pixel in the preset display picture;

[0018] the out-of-plane resistance is an equivalent resistance of a signal output by a first power supply connected to a power input end of the single-color sub-pixel to the display area; and the in-plane resistance of the display panel in the reference display picture under the preset display gray scale includes a total parallel resistance of the single-color sub-pixels in the display area in the reference display picture under the preset display gray scale.

[0019] Optionally, the compensation coefficient is calculated according to the following formula:

[0020] ;

[0021] wherein, represents the compensation coefficient corresponding to the single-color sub-pixel with the preset display gray scale , Ri0 represents the in-plane resistance corresponding to the single-color sub-pixel in the reference display picture under the preset display gray scale , and Ri0 represents the out-of-plane resistance corresponding to the single-color sub-pixel. ​a total current corresponding to the monochrome sub-pixel under the reference display screen, I20 being a total current corresponding to the monochrome sub-pixel under a preset display screen.

[0022] Optionally, the total current corresponding to the to-be-displayed screen and the to-be-displayed gray scale data are acquired, including: acquiring a total current corresponding to the monochrome sub-pixel under the to-be-displayed screen and a to-be-displayed gray scale of the monochrome sub-pixel in the to-be-displayed gray scale data;

[0023] Optionally, the compensation coefficient corresponding to the sub-pixel is determined according to the total current corresponding to the to-be-displayed screen and the to-be-displayed gray scale of the sub-pixel, including:

[0024] When the total current corresponding to the monochrome sub-pixel under the to-be-displayed screen matches the total current of the monochrome sub-pixel of the same light-emitting color under the preset display screen, and the to-be-displayed gray scale of the monochrome sub-pixel matches the preset display gray scale, the compensation coefficient corresponding to the monochrome sub-pixel under the preset display gray scale of the monochrome sub-pixel under the preset display screen is determined as the compensation coefficient of the monochrome sub-pixel under the to-be-displayed gray scale under the to-be-displayed screen;

[0025] When the total current corresponding to the monochrome sub-pixel under the to-be-displayed screen does not match the total current of the monochrome sub-pixel of the same light-emitting color under the preset display screen, and / or the to-be-displayed gray scale of the monochrome sub-pixel does not match the preset display gray scale, the compensation coefficient of the monochrome sub-pixel under the to-be-displayed gray scale under the to-be-displayed screen is calculated by interpolation according to the compensation coefficient corresponding to the monochrome sub-pixel under the preset display gray scale under the preset display screen.

[0026] Optionally, under the set display brightness value, the brightness relationship between the display brightness of the monochrome sub-pixel corresponding to the preset display gray scale in the display panel under a plurality of preset display screens and the reference display brightness corresponding to the monochrome sub-pixel under the preset display gray scale of the reference display screen is determined, including:

[0027] For any monochrome sub-pixel of a light-emitting color, the relationship between the in-plane resistance corresponding to the monochrome sub-pixel and the out-of-plane resistance corresponding to the monochrome sub-pixel of the display panel under the reference display screen corresponding to the preset display gray scale is determined.

[0028] The brightness relationship is determined according to the total current corresponding to the monochrome sub-pixel under the preset display screen, the total current corresponding to the monochrome sub-pixel under the reference display screen, and the relationship between the in-plane resistance corresponding to the monochrome sub-pixel and the out-of-plane resistance corresponding to the monochrome sub-pixel.

[0029] Optionally, for any monochrome sub-pixel of a light-emitting color, the relationship between the in-plane resistance corresponding to the monochrome sub-pixel and the out-of-plane resistance corresponding to the monochrome sub-pixel of the display panel under the reference display screen corresponding to the preset display gray scale is determined.

[0030] For any single-color sub-pixel of any light-emitting color, the relationship between the in-plane resistance and the out-of-plane resistance corresponding to the display panel is determined according to the total current corresponding to the single-color sub-pixel under the reference display screen of the preset display gray scale, the reference display brightness, and the total current corresponding to the single-color sub-pixel under at least one other display screen and the brightness corresponding to the single-color sub-pixel of the preset display gray scale.

[0031] Optionally, the number of display brightness values includes at least two; the compensation coefficient corresponding to the sub-pixel under the display brightness value other than the set display brightness value is obtained by interpolation calculation according to the compensation coefficients under the at least two set display brightness values.

[0032] Optionally, the total current of the to-be-displayed screen is the current on the first power bus or the second power bus under the previous frame of the to-be-displayed screen.

[0033] Optionally, the brightness compensation of the sub-pixel according to the compensation coefficient corresponding to the sub-pixel includes:

[0034] The target display data corresponding to the sub-pixel is determined according to the compensation coefficient corresponding to the sub-pixel and the to-be-displayed gray scale corresponding to the sub-pixel, and the target display data includes a target data voltage or a target display gray scale.

[0035] The sub-pixel is driven according to the target display data.

[0036] In a second aspect, an embodiment of the present application further provides a display panel, which is subjected to brightness compensation by using the brightness compensation method of the display panel in the first aspect.

[0037] The display panel includes a driving chip, which is electrically connected with the first power bus and / or the second power bus and is used to acquire the total current on the first power bus or the second power bus.

[0038] Optionally, the display panel includes single-color sub-pixels of at least two light-emitting colors, and each single-color sub-pixel includes a light-emitting device and a pixel circuit, the pixel circuit is electrically connected with a first electrode of the light-emitting device, the pixel circuit includes a power input end connected with a first power supply, and the pixel circuit is used to drive the light-emitting device to emit light according to a power signal input by the power input end; a second electrode of the light-emitting device is connected with a second power supply.

[0039] The second electrodes of the light-emitting devices of different light-emitting colors are insulated from each other; and / or the power input ends of the pixel circuits connected with the light-emitting devices of different light-emitting colors are insulated from each other.

[0040] Optionally, the display area of the display panel is divided into a plurality of sub-display areas; in different sub-display areas, the second electrodes of the light emitting devices of the same light emitting color are insulated from each other, and the second electrodes of the light emitting devices of the same light emitting color in different sub-display areas are connected to different second power supplies through different second sub-power supply buses.

[0041] And / or, in different sub-display areas, the power input ends of the pixel circuits connected to the light emitting devices of the same light emitting color are insulated from each other, and the power input ends of the pixel circuits connected to the light emitting devices of the same light emitting color in different sub-display areas are connected to different first power supplies through different first sub-power supply buses.

[0042] The brightness compensation method and the display panel of the display panel provided in the embodiment of the present application, by obtaining the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale data, determining the compensation coefficient corresponding to each sub-pixel according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel, and then performing brightness compensation on the sub-pixel according to the compensation coefficient corresponding to the sub-pixel. The technical scheme of the present application considers both the influence of the change of the total current on the brightness of the sub-pixel of the same display gray scale caused by the change of the voltage division of the out-of-plane resistance and the influence of the change of the total current on the brightness of the sub-pixel of different display gray scales under the same frame display picture, realizes the brightness compensation of the sub-pixel by the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel, reduces the brightness difference of the sub-pixel corresponding to the same display gray scale caused by the change of the voltage division of the out-of-plane resistance when the total current changes due to the change of the display picture, and improves the display effect of the picture. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a flowchart of a brightness compensation method of a display panel provided by the embodiment of the present application;

[0044] Figure 2 is a circuit structure schematic diagram of a pixel circuit and a light emitting device of a sub-pixel in the related art;

[0045] Figure 3 is a structure schematic diagram of a display panel provided by the embodiment of the present application;

[0046] Figure 4 is Figure 3 is an equivalent circuit diagram of the display panel shown in FIG. 8;

[0047] Figure 5 is a structure schematic diagram of another display panel provided by the embodiment of the present application;

[0048] Figure 6 is Figure 5 is an equivalent circuit diagram of the display panel shown in FIG. 10;

[0049] Figure 7is a flowchart of another display panel brightness compensation method provided by an embodiment of the present application;

[0050] Figure 8 is a structural schematic diagram of another display panel provided by an embodiment of the present application. DETAILED DESCRIPTION

[0051] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, but not all the structures.

[0052] As described in the background, in the existing display panel, under different display pictures, the luminance of the sub-pixels corresponding to the same display gray scale in the display panel is different, which affects the picture display effect. The inventor has found that the reason for the above problem is that the display panel includes a plurality of sub-pixels located in a display area, the sub-pixel includes a light emitting device and a pixel circuit for driving the light emitting device to emit light. The pixel circuit includes a power input end, the power input end is connected to a first power supply in a non-display area, and the cathode of the light emitting device is connected to a second power supply. When the display panel displays, the current flows from the first power supply to the second power supply through the light emitting device that is turned on, and there is a resistance in the path through which the current flows, which includes an off-plane resistance and an in-plane resistance. The off-plane resistance is the transmission resistance of the current flowing from the first power supply to the power input end of the pixel circuit in the display area, and the in-plane resistance is the parallel equivalent resistance of all the sub-pixels that are turned on in the display panel. Because the corresponding gray scale data is different under different display pictures, the gray scale data includes the display gray scale corresponding to each sub-pixel in the display panel, so that the corresponding total current is different under different display pictures, the total current can be the current flowing out of the first power supply or the current flowing into the second power supply, which causes the voltage at the power input end of the pixel circuit of a certain sub-pixel to change even if the display gray scale of the sub-pixel does not change under different display pictures, resulting in that the luminance of the sub-pixels corresponding to the same display gray scale in the display panel is different under different display pictures, which affects the picture display effect.

[0053] Based on the above reasons, an embodiment of the present application provides a display panel brightness compensation method, Figure 1 is a flowchart of a display panel brightness compensation method provided by an embodiment of the present application, referring to Figure 1 The display panel brightness compensation method includes:

[0054] Step 110, obtaining the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale data.

[0055] The to-be-displayed picture can be a picture to be displayed. For example, the to-be-displayed picture is a next frame picture at a current time node. The display panel includes a plurality of sub-pixels, a first power bus and a second power bus connected to the sub-pixels, and the first power bus and the second power bus are located in a non-display area of the display panel. The total current is the current on the first power bus or the second power bus. Specifically, the sub-pixel can include a pixel circuit and a light emitting device, Figure 2 is a circuit structure diagram of a pixel circuit and a light emitting device of a sub-pixel in the related art. The pixel circuit includes a power input terminal IN, and the power input terminal IN of the pixel circuit is connected to the first power bus V1 as the power input terminal IN of the sub-pixel. The pixel circuit further includes a driving transistor DT, the source of the driving transistor DT is connected to the power input terminal IN through a transistor, the drain of the driving transistor DT is connected to the anode of the light emitting device OLED through a transistor, and the cathode of the light emitting device OLED is connected to the second power bus V2. Alternatively, at least some sub-pixels with the same light emitting color are connected to the same first power bus V1, and at least some sub-pixels with the same light emitting color are connected to the same second power bus V2. In some optional embodiments of the present application, all sub-pixels in the display panel are connected to the same first power through the same first power bus V1, and all sub-pixels are connected to the same second power through the same second power bus V2. The display panel includes a driving chip, the driving chip is electrically connected to the first power bus V1 and / or the second power bus V2, and is used to obtain the total current on the first power bus V1 or the second power bus V2. The to-be-displayed gray scale data includes to-be-displayed gray scales of each sub-pixel in the display panel. In the to-be-displayed picture, the to-be-displayed gray scales of different sub-pixels can be the same or different.

[0056] In step 120, a compensation coefficient corresponding to each sub-pixel is determined according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel.

[0057] As indicated above, the corresponding total current can be different under different display pictures, resulting in a change in the voltage division of the out-of-plane resistance, so that the voltage at the power input end of the pixel circuit of a certain sub-pixel changes even if the display gray scale of the sub-pixel does not change under different display pictures, which affects the display brightness of the sub-pixels in the display panel. In the embodiment, the compensation coefficient corresponding to the sub-pixel is determined according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel, the influence of the change in the total current on the brightness of the sub-pixels of the same display gray scale is considered, and the compensation coefficient corresponding to the sub-pixel is determined according to the total current corresponding to the to-be-displayed picture. Moreover, the influence of the change in the total current on the brightness of the sub-pixels of different display gray scales under the same frame display picture can be different. In the embodiment, the influence of the change in the total current on the brightness of the sub-pixels of different display gray scales is considered, and the to-be-displayed gray scale corresponding to the sub-pixel is also considered when the compensation coefficient is determined. The compensation coefficient corresponding to the sub-pixels of different to-be-displayed gray scales can be different. That is, in this step, when the compensation coefficient corresponding to the sub-pixel is determined, both the influence of the change in the total current on the brightness of the sub-pixels of the same display gray scale and the influence of the change in the total current on the brightness of the sub-pixels of different display gray scales under the same frame display picture are considered. The compensation coefficient corresponding to the sub-pixel is determined according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel. The compensation coefficient needs to meet the requirement that after the brightness of the sub-pixel is compensated according to the compensation coefficient corresponding to the sub-pixel, the brightness difference of the sub-pixel under the same display gray scale is less than a set threshold when the display panel displays different display pictures; in some optional embodiments of the present application, the size of the compensation coefficient can ensure that after the brightness of the sub-pixel is compensated according to the compensation coefficient, the brightness difference of the sub-pixel under the same display gray scale is 0 when the display panel displays different display pictures.

[0058] The corresponding relationship between the total current corresponding to the to-be-displayed picture, the to-be-displayed gray scale of the sub-pixel, and the compensation coefficient can be obtained by experiment or simulation before step 110 is performed and stored in the driving chip of the display panel. When the compensation coefficient corresponding to the sub-pixel is determined according to the total current corresponding to the to-be-displayed picture and the to-be-displayed gray scale of the sub-pixel, the compensation coefficient can be determined according to the stored corresponding relationship.

[0059] Step 130, compensating the brightness of the sub-pixel according to the compensation coefficient corresponding to the sub-pixel.

[0060] Specifically, when the brightness of the sub-pixel is compensated according to the compensation coefficient corresponding to the sub-pixel, the target display data corresponding to the sub-pixel can be determined according to the compensation coefficient, and then the sub-pixel is driven according to the target display data. Alternatively, the target display data corresponding to the sub-pixel is determined according to the compensation coefficient corresponding to the sub-pixel and the display gray scale to be displayed corresponding to the sub-pixel, and the target display data includes a target data voltage or a target display gray scale. In some optional embodiments, the corresponding relationship between the compensation coefficient and the compensation amount can be stored in advance; in other optional embodiments, an algorithm for calculating the compensation amount according to the compensation coefficient can be set, and after the compensation coefficient corresponding to the sub-pixel is obtained, the compensation amount is calculated according to the compensation coefficient and the set algorithm. The compensation amount can be a data voltage compensation amount corresponding to the pixel circuit of the sub-pixel, or a gray scale compensation amount. When the compensation amount is a data voltage compensation amount, the target data voltage corresponding to the sub-pixel can be determined according to the initial data voltage corresponding to the display gray scale to be displayed of the sub-pixel and the data voltage compensation amount corresponding to the sub-pixel, and when the display of the to-be-displayed picture is performed, the target data voltage is provided to the pixel circuit of the sub-pixel. When the compensation amount is a gray scale compensation amount, the target display gray scale corresponding to the sub-pixel can be determined according to the display gray scale to be displayed of the sub-pixel and the gray scale compensation amount, then the target data voltage of the sub-pixel is determined according to the target display gray scale, and when the display of the to-be-displayed picture is performed, the target data voltage is provided to the pixel circuit of the sub-pixel.

[0061] The brightness compensation method of the display panel in the embodiment obtains the total current corresponding to the to-be-displayed picture and the display gray scale data to be displayed, determines the compensation coefficient corresponding to the sub-pixel according to the total current corresponding to the to-be-displayed picture and the display gray scale to be displayed of the sub-pixel, and then compensates the brightness of the sub-pixel according to the compensation coefficient corresponding to the sub-pixel. The technical solution of the embodiment considers both the influence of the change of the total current on the brightness of the sub-pixel corresponding to the same display gray scale due to the change of the out-of-plane resistance voltage division and the influence of the change of the total current on the brightness of the sub-pixels corresponding to different display gray scales in the same frame of display picture, and the brightness of the sub-pixel is compensated according to the total current corresponding to the to-be-displayed picture and the display gray scale to be displayed of the sub-pixel, thereby reducing the brightness difference of the sub-pixel corresponding to the same display gray scale caused by the change of the total current due to the change of the display picture, and improving the display effect of the picture.

[0062] Figure 3 is a structural schematic diagram of a display panel provided by an embodiment of the application, Figure 4 is Figure 3 is an equivalent circuit diagram of the display panel shown in FIG. 1, Figure 3 and Figure 4The display panel includes a first power supply 20 and a second power supply 30, the first power supply 20 is connected to the power input terminals IN of the single-color sub-pixels 10 through the same first power supply bus V1 (the first power supply bus V1 corresponds to the total surface resistance R0) respectively. Figure 3 and Figure 4 The display panel includes three single-color sub-pixels 10, i.e., a red sub-pixel 11, a green sub-pixel 11 and a blue sub-pixel 12, and the corresponding light emitting devices are a red light emitting device R, a green light emitting device G and a blue light emitting device B respectively, the light emitting device includes a first electrode, a light emitting layer and a second electrode which are arranged in a stack, wherein the first electrode can be an anode of the light emitting device, and the second electrode can be a cathode of the light emitting device. The second electrodes of the light emitting devices are connected to each other and connected to the same second power supply 30 through the same second power supply bus V2. Figure 4 The driving transistor of the pixel circuit is schematically shown in FIG. 1C, the first electrode of the driving transistor is the power input terminal of the pixel circuit, and the second electrode of the driving transistor is electrically connected to the first electrode of the light emitting device. Figure 3 and Figure 4 The current I flowing through the total surface resistance R0 is I=I1+I2+I3. Wherein, I is the total current flowing through the total surface resistance R0, I1 is the first total current corresponding to the parallelly connected red sub-pixels 11, I2 is the second total current corresponding to the parallelly connected green sub-pixels 11, and I3 is the third total current corresponding to the parallelly connected blue sub-pixels 12. Figure 3 The total current corresponding to the to-be-displayed picture is the total current I flowing through the total surface resistance R0, or the current on the first power supply bus V1, or the current on the second power supply bus V2.

[0063] The brightness compensation method of the display panel of the embodiment of the present application can be applied to the display panel shown in FIG. 1A. Figure 3 When the brightness compensation method is applied to the display panel shown in FIG. 1A, the difference in the light emitting colors of the sub-pixels does not need to be considered, and the compensation coefficients corresponding to the sub-pixels of different light emitting colors corresponding to the same to-be-displayed gray scale under the to-be-displayed picture can be equal. Figure 3

[0064] When the single-color sub-pixels 10 of different light emitting colors are connected to the same first power supply 20 and the second power supply 30, the single-color sub-pixels 10 of different light emitting colors will affect each other. For example, Figure 4 ​wherein Rx represents the total in-plane resistance of the display panel, R1 represents the parallel resistance of each red sub-pixel 11 that is lit, R2 represents the parallel resistance corresponding to the green sub-pixel 11 that is lit, and R3 represents the parallel resistance corresponding to the blue sub-pixel 12 that is lit. Thus, the parallel resistance of the single-color sub-pixel 10 affects the total in-plane resistance Rx, and in turn affects the current between the first power supply 20 and the second power supply 30, so that the voltage drop across the total out-plane resistance R0 is affected, and the voltage at the power input terminal IN is equal to the first power supply voltage ELVDD output by the first power supply 20 minus the product of the total out-plane resistance R0 and the current flowing through the total out-plane resistance R0, so that the actual voltage RealELVDD input to the power input terminal IN is also affected, and there is a problem that the luminance of the sub-pixel 10 is different when the same driving data, which can be a data voltage, is provided to the sub-pixel 10 of the same display gray scale in a single-color display image and a white display image.

[0065] Based on this, the above-mentioned driving method of the present application can also be applied to Figure 5 the display panel shown in FIG. 1. Figure 5 is another structural schematic diagram of a display panel provided by an embodiment of the present application, Figure 6 is Figure 5 is an equivalent circuit diagram of the display panel shown in FIG. 1, referring to Figure 5 and Figure 6 The display panel includes at least two single-color sub-pixels of different light-emitting colors, and the single-color sub-pixel 10 includes a light-emitting device and a pixel circuit. Figure 5 and Figure 6 The display panel includes three single-color sub-pixels 10 of different light-emitting colors, i.e., a red sub-pixel 11, a green sub-pixel 11, and a blue sub-pixel 12, and the corresponding light-emitting devices are a red light-emitting device R, a green light-emitting device G, and a blue light-emitting device B, respectively. The light-emitting device includes a first electrode, a light-emitting layer, and a second electrode arranged in a stack, wherein the first electrode can be an anode of the light-emitting device, and the second electrode can be a cathode of the light-emitting device. The pixel circuit is electrically connected to the first electrode of the light-emitting device, and the pixel circuit includes a power input terminal IN connected to the first power supply 20, and the pixel circuit is configured to drive the light-emitting device to emit light according to a power signal input by the power input terminal IN; and the second electrode of the light-emitting device is connected to the second power supply 30. Figure 6 The driving transistor included in the pixel circuit is schematically shown in FIG. 1, wherein the first electrode of the driving transistor serves as the power input terminal IN of the pixel circuit, and the second electrode of the driving transistor is electrically connected to the first electrode of the light-emitting device.

[0066] Referring to Figure 5 and Figure 6In some alternative embodiments of the present application, the second power bus V2 includes at least two second sub-power buses insulated from each other, wherein the single-color sub-pixels 10 of different light-emitting colors are connected to different second power sources 30 through different second sub-power buses. Specifically, the second electrodes of the light-emitting devices of different light-emitting colors are insulated from each other, and the second electrodes of the light-emitting devices of different light-emitting colors are connected to different second power sources 30 through different second sub-power buses, wherein the second electrode of the red light-emitting device R is connected to the first second power source 31 (the second power source voltage provided by the first second power source 31 is ELVSS1) through the first second sub-power bus V21, the second electrode of the green light-emitting device G is connected to the second second power source 32 (the second power source voltage provided by the second second power source 32 is ELVSS2) through the second second sub-power bus V22, and the second electrode of the blue light-emitting device B is connected to the third second power source 33 (the second power source voltage provided by the third second power source 33 is ELVSS3) through the third second sub-power bus V23. That is, for the display panel shown in Figure 5 and Figure 6 the second electrodes of the light-emitting devices of the same light-emitting color in the display panel can be connected to each other, but the second electrodes of the light-emitting devices of different light-emitting colors are in no connection relationship, and the second electrodes of the light-emitting devices of different light-emitting colors are connected to different second power sources 30, wherein the second power source voltages provided by the different second power sources 30 can be different.

[0067] With reference to Figure 5 and Figure 6 alternatively, the first power bus V1 includes at least two first sub-power buses insulated from each other, wherein the single-color sub-pixels 10 of different light-emitting colors are connected to different first power sources 20 through different first sub-power buses. Specifically, the power input ends IN of the pixel circuits connected to the light-emitting devices of different light-emitting colors are insulated from each other, and the power input ends IN of the pixel circuits connected to the light-emitting devices of different light-emitting colors are connected to different first power sources 20, wherein the power input end IN of the pixel circuit connected to the red light-emitting device R is connected to the first first power source 21 (the first power source voltage provided by the first first power source 21 is ELVDD1) through the first first sub-power bus V11, the power input end IN of the pixel circuit connected to the green light-emitting device G is connected to the second first power source 22 (the first power source voltage provided by the second first power source 22 is ELVDD2) through the second first sub-power bus V12, and the power input end IN of the pixel circuit connected to the blue light-emitting device B is connected to the third first power source 23 (the first power source voltage provided by the third first power source 23 is ELVDD3) through the third first sub-power bus V13. That is, for the display panel shown in Figure 5 and Figure 6For the display panel shown in the figure, the power input terminals of the pixel circuits connected with the light emitting devices of the same light emitting color in the display panel can be connected with each other, but the power input terminals of the pixel circuits connected with the light emitting devices of different light emitting colors are not connected with each other, and the power input terminals of the pixel circuits connected with the light emitting devices of different light emitting colors are connected with different first power supplies 20, wherein the first power supply voltages provided by the different first power supplies 20 can be different.

[0068] The first power supplies 20 connected with the monochromatic sub-pixels 10 of different light emitting colors are independently set, that is, the monochromatic sub-pixels 10 of different light emitting colors are connected with the power input terminals of the monochromatic sub-pixels 10 through different first sub-power supply lines, and the monochromatic sub-pixels 10 of different light emitting colors correspond to different out-of-plane resistances (that is, the first monochromatic out-of-plane resistance R01 corresponding to the red sub-pixel 11, the second monochromatic out-of-plane resistance R02 corresponding to the green sub-pixel 11, and the third monochromatic out-of-plane resistance R03 corresponding to the blue sub-pixel 12). Referring to Figure 5 , the parallel resistance of each red sub-pixel 11 that is lighted is the first monochromatic in-plane resistance R1, the parallel resistance of the green sub-pixel 11 that is lighted is the second monochromatic in-plane resistance R2, and the parallel resistance of the blue sub-pixel 12 that is lighted is the third monochromatic in-plane resistance R3, wherein when the monochromatic in-plane resistance corresponding to one kind of monochromatic sub-pixel 10 changes, the current on the monochromatic out-of-plane resistance corresponding to the monochromatic sub-pixels 10 of other colors will not be affected, that is, the total current I1 corresponding to the red sub-pixel 11, the total current I2 corresponding to the green sub-pixel 11, and the total current I3 corresponding to the blue sub-pixel 12 will not affect each other, so when the monochromatic in-plane resistance corresponding to one kind of monochromatic sub-pixel 10 changes, the luminance of the monochromatic sub-pixel 10 of other light emitting colors at the same display gray scale can remain unchanged. The independent setting of the first power supplies 20 connected with the monochromatic sub-pixels 10 of different light emitting colors and / or the independent setting of the second power supplies 30 connected with the monochromatic sub-pixels 10 of different light emitting colors can reduce the mutual influence between the monochromatic sub-pixels 10 of different light emitting colors, and further reduce the luminance difference of the sub-pixels 10 corresponding to the same display gray scale under the monochromatic display picture and the white display picture, which is beneficial to improve the display effect.

[0069] Optionally, for the display panel shown in the figure, Figure 5 The total current corresponding to the to-be-displayed picture includes the total current corresponding to the monochromatic sub-pixels of different light emitting colors under the to-be-displayed picture. The total current corresponding to the monochromatic sub-pixels under the to-be-displayed picture is the current on the first sub-power bus connected with the monochromatic sub-pixels; or the total current corresponding to the monochromatic sub-pixels under the to-be-displayed picture is the current on the second sub-power bus connected with the monochromatic sub-pixels.

[0070] The luminance compensation method of the display panel of the embodiment of the present application is applied to Figure 5When the display panel is shown, the brightness compensation method of the display panel includes: for a monochrome sub-pixel of any luminous color, obtaining the total current corresponding to the monochrome sub-pixel under the picture to be displayed and the grayscale to be displayed of the monochrome sub-pixel in the grayscale data to be displayed; determining the compensation coefficient corresponding to the sub-pixel according to the total current corresponding to the monochrome sub-pixel and the grayscale to be displayed of the monochrome sub-pixel under the picture to be displayed; and performing brightness compensation on the monochrome sub-pixel according to the compensation coefficient corresponding to the monochrome sub-pixel.

[0071] Based on the above technical solution, optionally, the total current of the picture to be displayed is the current on the first power bus or the second power bus under the previous frame display picture of the picture to be displayed.

[0072] Because the picture to be displayed is a picture that has not been displayed at the current time node. Accordingly, the current on the first power bus or the second power bus under the picture to be displayed cannot be known. When the display panel is displaying, the display picture is actually a gradual process. The difference between two adjacent frames of display pictures is usually very small. Accordingly, the difference in the total current corresponding to the two adjacent frames of display pictures is very small. In this embodiment, the current on the first power bus or the second power bus under the previous frame of display picture of the picture to be displayed is used as the total current of the picture to be displayed, so that the total current of the picture to be displayed can be known and is relatively accurate.

[0073] for Figure 3 For the display panel shown, monochrome sub-pixels of different luminous colors are connected to the same first power supply via the same first power bus, and monochrome sub-pixels of different luminous colors are connected to the same second power supply via the same second power bus. For any monochrome sub-pixel of any luminous color, the total current for the image to be displayed is the current on the first power bus or the second power bus during the previous frame of the image to be displayed.

[0074] for Figure 5 For the display panel shown, the first power bus includes at least two first sub-power buses, and monochrome sub-pixels of different luminous colors are connected to different first power sources via different first sub-power buses; and / or the second power bus includes at least two second sub-power buses, and monochrome sub-pixels of different luminous colors are connected to different second power sources via different second sub-power buses. The total current corresponding to the image to be displayed includes the total current corresponding to the monochrome sub-pixels of different luminous colors in the image to be displayed. For a monochrome sub-pixel of a single luminous color, its corresponding total current in the image to be displayed is the current on the first sub-power bus or the second sub-power bus connected to the monochrome sub-pixel in the previous frame of the image to be displayed.

[0075] Figure 7 This is a flow chart of another method for brightness compensation of a display panel provided by an embodiment of the present invention, with reference to Figure 7The display panel brightness compensation method comprises:

[0076] Step 210, for any single-color sub-pixel of a light-emitting color, at a set display brightness value, determining the brightness relationship between the display brightness of the single-color sub-pixel corresponding to a preset display gray scale in the display panel under a plurality of preset display pictures and the reference display brightness corresponding to the single-color sub-pixel under a reference display picture of the preset display gray scale.

[0077] In the reference display picture of the preset display gray scale, the display gray scales of the single-color sub-pixels of the same light-emitting color are all the preset display gray scales; and in the preset display picture, the display gray scales of the single-color sub-pixels of the same light-emitting color include the preset display gray scales and other display gray scales.

[0078] For any single-color sub-pixel of a light-emitting color, the display proportions are different and / or the display gray scales corresponding to the single-color sub-pixels are not completely the same under different preset display pictures. For any single-color sub-pixel of a light-emitting color, the display proportion is equal to the ratio of the number of the single-color sub-pixels that are turned on to the total number of the single-color sub-pixels. For example, for any single-color sub-pixel of a light-emitting color, the display proportion under one preset display picture is 30%, and the display proportion under another preset display picture is 50%, so the display proportions of the single-color sub-pixels of the light-emitting color under the two preset display pictures are different. For example, for any single-color sub-pixel of a light-emitting color, the display gray scales corresponding to the single-color sub-pixel under one preset display picture include 64 gray scales, 128 gray scales and 255 gray scales, and the display gray scales corresponding to the single-color sub-pixel under another preset display picture include 32 gray scales and 255 gray scales, so the display gray scales corresponding to the single-color sub-pixels of the light-emitting color under the two preset display pictures are not completely the same.

[0079] In the reference display picture of the preset display gray scale, the display gray scales of the single-color sub-pixels of the same light-emitting color are all the preset display gray scales; and in the preset display picture, the display gray scales of the single-color sub-pixels of the same light-emitting color include the preset display gray scales and other display gray scales.

[0080] The luminance relationship is related to the out-of-plane resistance of the display panel, the in-plane resistance of the display panel under the reference display picture of the preset display gray scale, and the total current corresponding to the monochromatic sub-pixel under the reference display picture, and the total current corresponding to the monochromatic sub-pixel under the preset display picture. The out-of-plane resistance is an equivalent resistance of a signal output by a first power supply connected to a power input end of the monochromatic sub-pixel and transmitted to the display area; and the in-plane resistance of the display panel under the reference display picture of the preset display gray scale includes a parallel total resistance of the monochromatic sub-pixels in the display area under the reference display picture of the preset display gray scale.

[0081] Specifically, the luminance relationship is related to the out-of-plane resistance of the display panel and the in-plane resistance of the display panel under the reference display picture of the preset display gray scale. To determine the luminance relationship, the relationship between the in-plane resistance of the display panel under the reference display picture of the preset display gray scale and the out-of-plane resistance of the display panel can be determined first. Optionally, the step 210 includes:

[0082] For any monochromatic sub-pixel of a light-emitting color, the relationship between the in-plane resistance corresponding to the monochromatic sub-pixel and the out-of-plane resistance corresponding to the monochromatic sub-pixel of the display panel under the reference display picture corresponding to the preset display gray scale is determined; and the luminance relationship is determined according to the total current corresponding to the monochromatic sub-pixel under the preset display picture, the total current corresponding to the monochromatic sub-pixel under the reference display picture, and the relationship between the in-plane resistance corresponding to the monochromatic sub-pixel and the out-of-plane resistance corresponding to the monochromatic sub-pixel.

[0083] For any monochromatic sub-pixel of a light-emitting color, the relationship between the in-plane resistance corresponding to the monochromatic sub-pixel and the out-of-plane resistance corresponding to the monochromatic sub-pixel of the display panel under the reference display picture corresponding to the preset display gray scale is determined; and the luminance relationship is determined according to the total current corresponding to the monochromatic sub-pixel under the preset display picture, the total current corresponding to the monochromatic sub-pixel under the reference display picture, and the relationship between the in-plane resistance corresponding to the monochromatic sub-pixel and the out-of-plane resistance corresponding to the monochromatic sub-pixel.

[0084] Taking the red sub-pixel as an example, first, the display panel is adjusted to display a picture with a red sub-pixel at a preset reference display proportion of a preset gray scale, the preset display gray scale is 255 gray scale, and under the preset reference display picture of the preset display gray scale, the display gray scale of all the red sub-pixels is 255 gray scale (i.e., under the preset reference display picture of the preset display gray scale, the display gray scale of all the red sub-pixels is 255 gray scale, and the display proportion corresponding to the red sub-pixel is 100%). The total current corresponding to the red sub-pixel is a first total current I01, and the reference display brightness corresponding to the red sub-pixel is L1 (the reference display brightness L1 can be the brightness of the red sub-pixel at a set position in the display panel or the average brightness of all the red sub-pixels in the display panel). The first total current I01 can be obtained by the driving chip from the first sub-power bus or the second sub-power bus, and the reference display brightness can be obtained by a brightness acquisition device such as a CCD camera and the like and then transmitted to the driving chip.

[0085] Then, the display panel is adjusted to other display pictures, under which the display gray scale of part of the red sub-pixels is equal to 255 gray scale, and the display gray scale of part of the red sub-pixels is other gray scales. Under the other display pictures, the total current corresponding to the red sub-pixel is a second total current I02, and the display brightness corresponding to the red sub-pixel of the preset display gray scale is L2 (L2 can be the brightness of the red sub-pixel of the preset display gray scale at a set position in the display panel or the average brightness of all the red sub-pixels of the preset display gray scale in the display panel). The second total current I02 can be obtained by the driving chip from the first sub-power bus or the second sub-power bus, and the display brightness L2 can be obtained by a brightness acquisition device such as a CCD camera and the like and then transmitted to the driving chip.

[0086] In combination with Figure 6 the equivalent circuit diagram of the display panel shown in FIG. 1, the equivalent circuit corresponding to the display of the red sub-pixel, under the preset reference display picture of the preset display gray scale, the voltage actually input to the power input end of the red sub-pixel can be calculated by formula (1):

[0087] ; (1)

[0088] wherein, is the voltage actually input to the power input end of the red sub-pixel under the preset reference display picture of the preset display gray scale; represents the out-of-plane resistance corresponding to the red sub-pixel; represents the single-color in-plane resistance corresponding to the red sub-pixel under the preset reference display picture of the preset display gray scale; and I01 represents the first total current corresponding to the red sub-pixel under the preset reference display picture of the preset display gray scale.

[0089] Under other display pictures, the voltage actually input to the power input end of the red sub-pixel can be calculated by formula (2):

[0090] ; (2)

[0091] wherein, is the voltage actually input to the power input end of the red sub-pixel under the reference display picture of the preset display gray scale; I01 represents the first total current corresponding to the red sub-pixel under the reference display picture of the preset display gray scale; I02 represents the second total current corresponding to the red sub-pixel under other pictures.

[0092] It should be noted that in the above process, the calculation and in the process, the second power voltage is considered as the reference voltage 0.

[0093] wherein, the luminous brightness of the light emitting device is positively correlated with the square of the voltage difference between the two ends of the light emitting device (i.e. the voltage difference between the anode and the cathode of the light emitting device). In combination with Figure 6 , for any monochromatic sub-pixel of a light emitting color, when the driving transistor drives the light emitting device to emit light, the driving transistor and the light emitting device can be regarded as equivalent resistance voltage division, therefore, the voltage difference between the two ends of the light emitting device is equal to the difference between the voltage actually input to the power input end of the sub-pixel and the source-drain voltage difference of the driving transistor , i.e. , and accordingly , i.e. the luminous brightness of the light emitting device is positively correlated with the square of the difference between the voltage actually input to the power input end of the sub-pixel and the source-drain voltage difference of the driving transistor . Again, because when the driving transistor drives the light emitting device to emit light, the driving transistor and the light emitting device can be regarded as equivalent resistance voltage division, the greater the voltage actually input to the power input end of the sub-pixel , the greater the voltage difference between the two ends of the light emitting device , and the luminous brightness of the light emitting device is positively correlated with the voltage actually input to the power input end of the sub-pixel , and therefore .

[0094] According to the above analysis, it can be obtained that:

[0095] ; (3)

[0096] Still taking the red sub-pixel as an example, in the above formula (3), the reference display brightness L1, the brightness L2 of the red sub-pixel corresponding to the preset display gray scale under other display pictures, the first total current I01, and the second total current I02 are all known quantities, and only the out-of-plane resistance , the monochrome in-plane resistance corresponding to the red sub-pixel Unknown, based on this, the monochrome in-plane resistance corresponding to the red sub-pixel can be determined Out-of-plane resistance corresponding to the red sub-pixel The relationship may be a proportional relationship.

[0097] After the relationship between the monochrome in-plane resistance and the monochrome out-of-plane resistance of the monochrome sub-pixel under the reference display screen with a preset display grayscale is obtained, the brightness relationship can be determined based on the total current corresponding to the monochrome sub-pixel under the preset display screen, the total current corresponding to the monochrome sub-pixel under the reference display screen, and the relationship between the in-plane resistance corresponding to the monochrome sub-pixel and the out-of-plane resistance corresponding to the monochrome sub-pixel. The brightness relationship can be a brightness ratio.

[0098] As mentioned above, the luminance Lum of the light emitting device is related to the actual voltage input to the power input terminal of the sub-pixel. Positive correlation, that is Based on this, we can get the following formula (4):

[0099] ; (4)

[0100] in, The ratio of the display brightness of the red sub-pixel corresponding to the preset display grayscale in the display panel under the preset display image to the reference display brightness of the red sub-pixel under the reference display image of the preset display grayscale; Indicates the actual input voltage of the power input terminal of the red sub-pixel corresponding to the preset display grayscale under the preset display screen; Indicates the total current corresponding to the red sub-pixel under the preset display screen. Based on this, the brightness ratio of the red sub-pixel display brightness corresponding to the preset display grayscale in the display panel under the preset display screen can be determined to the reference display brightness of the red sub-pixel under the reference display screen with the preset display grayscale. The total current corresponding to the red sub-pixel under the preset display screen The power can be obtained from the corresponding first sub-power bus or second sub-power bus through the driver chip.

[0101] For monochrome sub-pixels of other colors, the display brightness of the monochrome sub-pixel corresponding to the preset display grayscale in the display panel under the preset display screen is the same as the derivation process of the brightness ratio of the reference display brightness corresponding to the monochrome sub-pixel under the reference display screen of the preset display grayscale as the red sub-pixel, and will not be repeated here.

[0102] Step 220 : Determine, based on the brightness relationship, the compensation coefficient corresponding to the monochrome sub-pixel of the preset display grayscale under the total current corresponding to the monochrome sub-pixel of the preset display screen.

[0103] Specifically, after the luminance relationship between the display luminance of the monochrome sub-pixel corresponding to the preset display gray scale in the display panel under the preset display picture and the reference display luminance corresponding to the monochrome sub-pixel under the reference display picture of the preset display gray scale is determined, the compensation coefficient can be determined according to the luminance relationship. Alternatively, when the luminance relationship is a luminance ratio, the compensation coefficient is equal to the reciprocal of the luminance ratio.

[0104] Alternatively, the calculation formula of the compensation coefficient is:

[0105] ; (5)

[0106] wherein, represents the compensation coefficient corresponding to the monochrome sub-pixel of the preset display gray scale, the in-plane resistance corresponding to the monochrome sub-pixel under the reference display picture of the preset display gray scale, Ri0 is the out-of-plane resistance corresponding to the monochrome sub-pixel, and I10 is the total current corresponding to the monochrome sub-pixel under the reference display picture of the preset display gray scale.

[0107] Step 230, store the compensation coefficient corresponding to the monochrome sub-pixel of the preset display gray scale under the total current of the monochrome sub-pixel corresponding to the preset display picture.

[0108] When storing the compensation coefficient, it can be stored in the form of a data table and a graph. Specifically, the corresponding relationship of the total current, the preset display gray scale and the compensation coefficient can be stored, and under each total circuit, the compensation coefficients corresponding to at least two preset display gray scales are stored. To facilitate subsequent determination of compensation coefficients under different preset display ratios, the corresponding compensation coefficients can be obtained by interpolation calculation.

[0109] Step 240, obtain the total current corresponding to the monochrome sub-pixel under the to-be-displayed picture and the to-be-displayed gray scale data of the monochrome sub-pixel.

[0110] Specifically, for the display panel shown in Figure 5 , the monochrome sub-pixels of different light emitting colors are connected to different first power supplies through different first sub-power supply buses, and / or the monochrome sub-pixels of different light emitting colors are connected to different second power supplies through different second sub-power supply buses. Therefore, the total currents corresponding to the monochrome sub-pixels of different light emitting colors may be different, and the to-be-displayed gray scales corresponding to the monochrome sub-pixels of different light emitting colors are also mostly different. In this step, the total currents corresponding to the monochrome sub-pixels of different light emitting colors under the to-be-displayed picture and the to-be-displayed gray scales of the monochrome sub-pixels of different light emitting colors in the to-be-displayed gray scale data can be obtained respectively.​​

[0111] Step 250, when the total current corresponding to the monochrome sub-pixel under the to-be-displayed picture matches the total current of the monochrome sub-pixel of the same light-emitting color under the preset display picture, and the to-be-displayed gray scale of the monochrome sub-pixel matches the preset display gray scale, the compensation coefficient of the monochrome sub-pixel under the preset display gray scale under the preset display picture is determined as the compensation coefficient of the monochrome sub-pixel under the to-be-displayed gray scale under the to-be-displayed picture.

[0112] The total current corresponding to the monochrome sub-pixel under the to-be-displayed picture matches the total current of the monochrome sub-pixel of the same light-emitting color under the preset display picture can mean that the difference between the total current corresponding to the monochrome sub-pixel under the to-be-displayed picture and the total current of the monochrome sub-pixel of the same light-emitting color under the preset display picture is within a first set range. The difference between the total current can be a difference value or a ratio value, and the first set range can be set according to actual needs. In some optional embodiments of the present application, the total current corresponding to the monochrome sub-pixel under the to-be-displayed picture matches the total current of the monochrome sub-pixel of the same light-emitting color under the preset display picture can mean that the total current corresponding to the monochrome sub-pixel under the to-be-displayed picture is equal to the total current of the monochrome sub-pixel of the same light-emitting color under the preset display picture.

[0113] The to-be-displayed gray scale corresponding to the monochrome sub-pixel under the to-be-displayed picture matches the preset display gray scale can mean that the difference between the to-be-displayed gray scale of the monochrome sub-pixel and the preset display gray scale is within a second set range. The difference between the to-be-displayed gray scale of the monochrome sub-pixel and the preset display gray scale can be a difference value or a ratio value, and the second set range can be set according to actual needs. In some optional embodiments of the present application, the to-be-displayed gray scale corresponding to the monochrome sub-pixel under the to-be-displayed picture matches the preset display gray scale can mean that the to-be-displayed gray scale of the monochrome sub-pixel is equal to the preset display gray scale.

[0114] Step 260, when the total current corresponding to the monochrome sub-pixel under the to-be-displayed picture does not match the total current of the monochrome sub-pixel of the same light-emitting color under the preset display picture, and / or the to-be-displayed gray scale of the monochrome sub-pixel does not match the preset display gray scale, the compensation coefficient of the monochrome sub-pixel under the to-be-displayed gray scale under the to-be-displayed picture is calculated by interpolation according to the compensation coefficient of the monochrome sub-pixel under the preset display gray scale under the preset display picture.

[0115] For example, when the total current corresponding to the monochromatic sub-pixel under the to-be-displayed picture does not match the total current of the monochromatic sub-pixel of the same light-emitting color under the preset display picture, and the to-be-displayed gray scale of the monochromatic sub-pixel matches the preset display gray scale, the compensation coefficient of the monochromatic sub-pixel corresponding to the to-be-displayed gray scale under the total current of the to-be-displayed picture can be obtained by interpolation according to the compensation coefficients of the monochromatic sub-pixel of the same preset display gray scale under the total current of at least two preset display pictures. When the total current corresponding to the monochromatic sub-pixel under the to-be-displayed picture matches the total current of the monochromatic sub-pixel of the same light-emitting color under the preset display picture, and the to-be-displayed gray scale of the monochromatic sub-pixel does not match the preset display gray scale, the compensation coefficient of the monochromatic sub-pixel corresponding to the to-be-displayed gray scale under the total current of the to-be-displayed picture can be obtained by interpolation according to the compensation coefficients of the monochromatic sub-pixel of at least two preset display grays under the preset display picture with the same total current as the to-be-displayed picture. When the total current corresponding to the monochromatic sub-pixel under the to-be-displayed picture does not match the total current of the monochromatic sub-pixel of the same light-emitting color under the preset display picture, and the to-be-displayed gray scale of the monochromatic sub-pixel does not match the preset display gray scale, the compensation coefficient of the monochromatic sub-pixel corresponding to the to-be-displayed gray scale under the total current of the to-be-displayed picture can be obtained by interpolation according to the compensation coefficients of the monochromatic sub-pixel corresponding to the preset display gray scale under the total current of at least two preset display pictures.

[0116] Step 270: brightness compensation is performed on the sub-pixel according to the compensation coefficient corresponding to the sub-pixel; this step is the same as the process of step 130 in the above-described embodiments, and thus will not be described again here.

[0117] On the basis of the above technical solutions, the number of display brightness values is set to at least two; and the compensation coefficient corresponding to the sub-pixel under a display brightness value other than the set display brightness value is obtained by interpolation according to the compensation coefficients under at least two set display brightness values.

[0118] The embodiment of the present application also provides a display panel which adopts the brightness compensation method of the display panel of any of the above-described embodiments of the present application for brightness compensation. Figure 3 The display panel also comprises a driving chip 40 which is electrically connected with the first power bus V1 and / or the second power bus V2, and is used to obtain the total current on the first power bus V1 or the second power bus V2.

[0119] On the basis of the above-described embodiments, optionally, the structure of the display panel can also be as follows Figure 5As shown, the display panel includes single-color sub-pixels of at least two light-emitting colors, the single-color sub-pixel includes a light-emitting device and a pixel circuit, the pixel circuit is electrically connected with a first electrode of the light-emitting device, the pixel circuit includes a power input end IN, the power input end IN is connected with a first power supply 20, and the pixel circuit is configured to drive the light-emitting device to emit light according to a power signal input by the power input end IN; a second electrode of the light-emitting device is connected with a second power supply; wherein the second electrodes of the light-emitting devices of different light-emitting colors are insulated from each other, and the second electrodes of the light-emitting devices of different light-emitting colors are connected with different second power supplies through different second sub-power supply buses V20; and / or the power input ends IN of the pixel circuits connected with the light-emitting devices of different light-emitting colors are insulated from each other, and the power input ends IN of the pixel circuits connected with the light-emitting devices of different light-emitting colors are connected with different first power supplies 20 through different first sub-power supply buses.

[0120] Further, Figure 8 is another structural schematic diagram of a display panel provided by an embodiment of the present application, referring to Figure 8 Optionally, the display area of the display panel is divided into a plurality of sub-display areas (AA1, AA2, …, AAi, AAi+1, …, AAn-1, AAn) (i is an integer greater than or equal to 1 and less than or equal to n-1, n is an integer greater than or equal to 2, and n is the number of sub-display areas into which the display area is divided). Figure 8 As shown in the figure, the display area is divided into two sub-display areas, i.e., a first sub-pixel area AA1 and a second sub-display area AA2; in different sub-display areas, the second electrodes of the light-emitting devices of the same light-emitting color are insulated from each other, and in different sub-display areas, the second electrodes of the light-emitting devices of the same light-emitting color are connected with different second power supplies through different second sub-power supply buses V20; and / or in different sub-display areas, the power input ends IN of the pixel circuits connected with the light-emitting devices of the same light-emitting color are insulated from each other, and in different sub-display areas, the power input ends IN of the pixel circuits connected with the light-emitting devices of the same light-emitting color are connected with different first power supplies 20 through different first sub-power supply buses V10.

[0121] For the display panel shown in Figure 8 , the total current under the to-be-displayed picture includes the current on the first sub-power supply bus V10 or the second sub-power supply bus V20 connected with the single-color sub-pixels of different light-emitting colors in the sub-display area.

[0122] It should be noted that, Figure 5 and Figure 8 the display panel shown in the figure does not show the structure of the driving chip, Figure 5 and Figure 8 the display panel shown in the figure also includes a driving chip, and the driving chip is electrically connected with each first sub-power supply bus and / or each second sub-power supply bus.

[0123] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A brightness compensation method for a display panel, characterized in that: include: Obtaining a total current and grayscale data to be displayed corresponding to a picture to be displayed; wherein the display panel includes a plurality of sub-pixels and a first power bus and a second power bus connected to at least two of the sub-pixels, the total current is the current on the first power bus or the second power bus; and the grayscale data to be displayed includes the grayscale to be displayed of each sub-pixel in the display panel; determining a compensation coefficient corresponding to each of the sub-pixels according to the total current corresponding to the image to be displayed and the grayscale to be displayed of the sub-pixel; Performing brightness compensation on the sub-pixel according to the compensation coefficient corresponding to the sub-pixel; The display panel includes monochromatic sub-pixels of at least two luminous colors, and the total current corresponding to the image to be displayed includes the total current corresponding to the monochromatic sub-pixels of different luminous colors under the image to be displayed; For the monochromatic sub-pixel of any luminous color, before determining the compensation coefficient corresponding to each sub-pixel according to the total current corresponding to the image to be displayed and the grayscale to be displayed of the sub-pixel, the method further includes: Under a set display brightness value, determining a brightness relationship between the display brightness of the monochrome sub-pixels corresponding to a preset display grayscale in the display panel under multiple preset display images and a reference display brightness corresponding to the monochrome sub-pixels under a reference display image of the preset display grayscale; wherein, under the reference display image of the preset display grayscale, the display grayscales of the monochrome sub-pixels of the same luminous color are all the preset display grayscales; and under the preset display image, the display grayscales of the monochrome sub-pixels of the same luminous color include the preset display grayscale and other display grayscales; Determining, according to the brightness relationship, the compensation coefficient corresponding to the monochrome sub-pixel of the preset display grayscale under the total current corresponding to the monochrome sub-pixel of the preset display screen; storing the compensation coefficient corresponding to the monochrome sub-pixel of the preset display grayscale under the total current corresponding to the monochrome sub-pixel of the preset display screen; The brightness relationship is related to the out-of-plane resistance of the display panel, the in-plane resistance of the display panel under the reference display image, the total current corresponding to the monochrome sub-pixel under the reference display image of the preset display grayscale, and the total current corresponding to the monochrome sub-pixel under the preset display image; The out-of-plane resistance is the equivalent resistance of the signal output by the first power supply connected to the power input terminal of the monochrome sub-pixel transmitted to the display area; the in-plane resistance of the display panel under the reference display image of the preset display grayscale includes the total parallel resistance of the monochrome sub-pixels in the display area under the reference display image of the preset display grayscale; The compensation coefficient is equal to the inverse of the ratio of the display brightness of the monochrome sub-pixel corresponding to the preset display grayscale in the display panel under the preset display image to the reference display brightness corresponding to the monochrome sub-pixel under the reference display image of the preset display grayscale; The ratio of the display brightness of the monochrome sub-pixel corresponding to the preset display grayscale in the display panel under the preset display image to the reference display brightness corresponding to the monochrome sub-pixel under the reference display image of the preset display grayscale is equal to the ratio of the first value to the square of the second value; The first value is equal to the product of the total current corresponding to the monochrome sub-pixel in the reference display screen of the preset display grayscale and the sum of the in-plane resistance and the out-of-plane resistance corresponding to the monochrome sub-pixel in the reference display screen of the preset display grayscale, minus the difference between the total current corresponding to the monochrome sub-pixel in the preset display screen and the out-of-plane resistance corresponding to the monochrome sub-pixel; The second value is equal to the product of the total current corresponding to the monochrome sub-pixel in the reference display image of the preset display grayscale and the in-plane resistance corresponding to the monochrome sub-pixel in the reference display image of the preset display grayscale.

2. The brightness compensation method of a display panel according to claim 1, wherein: The first power bus includes at least two mutually insulated first sub-power buses, wherein the monochrome sub-pixels of different luminous colors are connected to different first power sources via different first sub-power buses; the total current corresponding to the monochrome sub-pixels in the image to be displayed is the current on the first sub-power buses connected to the monochrome sub-pixels; And / or, the second power bus includes at least two second sub-power buses insulated from each other, wherein monochrome sub-pixels of different luminous colors are connected to different second power supplies through different second sub-power buses; the total current corresponding to the monochrome sub-pixels under the image to be displayed is the current on the second sub-power bus connected to the monochrome sub-pixels.

3. The brightness compensation method of a display panel according to claim 2, wherein: The first power bus and the second power bus are located in a non-display area of ​​the display panel.

4. The brightness compensation method of a display panel according to claim 1, wherein: The calculation formula of the compensation coefficient is: ； in, Indicates the default display grayscale is The compensation coefficient corresponding to the monochrome sub-pixel, To correspond to the preset display grayscale Under the reference display screen, the in-plane resistance corresponding to the monochrome sub-pixel, R i 0 is the out-of-plane resistance corresponding to the monochrome sub-pixel, I10 is the grayscale corresponding to the preset display I20 is the total current corresponding to the monochrome sub-pixel under the reference display screen, and I21 is the total current corresponding to the monochrome sub-pixel under the preset display screen.

5. The brightness compensation method of a display panel according to claim 1, wherein: Acquiring the total current and grayscale data to be displayed corresponding to the image to be displayed includes: acquiring the total current corresponding to the monochrome sub-pixel under the image to be displayed and the grayscale to be displayed of the monochrome sub-pixel in the grayscale data to be displayed.

6. The brightness compensation method of a display panel according to claim 1, wherein: The determining of the compensation coefficient corresponding to each sub-pixel according to the total current corresponding to the image to be displayed and the grayscale to be displayed of the sub-pixel includes: When, under the image to be displayed, the total current corresponding to the monochrome sub-pixel matches the total current of the monochrome sub-pixel of the same luminous color under the preset display image, and the grayscale to be displayed of the monochrome sub-pixel matches the preset display grayscale, the compensation coefficient corresponding to the monochrome sub-pixel at the preset display grayscale under the preset display image is determined as the compensation coefficient of the monochrome sub-pixel of the grayscale to be displayed under the image to be displayed; When, under the image to be displayed, the total current corresponding to the monochrome sub-pixel does not match the total current of the monochrome sub-pixel of the same luminous color under the preset display image, and / or the grayscale to be displayed of the monochrome sub-pixel does not match the preset display grayscale, the compensation coefficient of the monochrome sub-pixel of the grayscale to be displayed under the image to be displayed is calculated by interpolation based on the compensation coefficient corresponding to the monochrome sub-pixel at the preset display grayscale under the preset display image.

7. The brightness compensation method of a display panel according to claim 1, wherein: The step of determining, under the set display brightness value, the display brightness of the monochrome sub-pixel corresponding to a preset display grayscale in the display panel under a plurality of preset display images, and the brightness relationship between the monochrome sub-pixel and the reference display brightness corresponding to the reference display image of the preset display grayscale, includes: For the monochrome sub-pixel of any luminous color, determining a relationship between an in-plane resistance of the display panel corresponding to the monochrome sub-pixel and an out-of-plane resistance corresponding to the monochrome sub-pixel under the reference display image corresponding to the preset display grayscale; The brightness relationship is determined based on the total current corresponding to the monochrome sub-pixel under the preset display screen, the total current corresponding to the monochrome sub-pixel under the reference display screen, and the relationship between the in-plane resistance corresponding to the monochrome sub-pixel and the out-of-plane resistance corresponding to the monochrome sub-pixel.

8. The brightness compensation method of a display panel according to claim 7, wherein: The determining, for the monochrome sub-pixel of any luminous color, a relationship between the in-plane resistance and the out-of-plane resistance of the display panel under the reference display image corresponding to the preset display grayscale includes: For the monochrome sub-pixel of any luminous color, the relationship between the in-plane resistance and the out-of-plane resistance of the display panel under the reference display picture of the preset display grayscale is determined based on the total current corresponding to the monochrome sub-pixel under the reference display picture of the preset display grayscale, the reference display brightness, and the total current corresponding to the monochrome sub-pixel under at least one other display picture and the brightness of the monochrome sub-pixel corresponding to the preset display grayscale.

9. The brightness compensation method of a display panel according to claim 1, wherein: The number of the set display brightness values ​​includes at least two; at display brightness values ​​other than the set display brightness value, the compensation coefficient corresponding to the sub-pixel is obtained by interpolation calculation based on the compensation coefficients at at least two of the set display brightness values.

10. The brightness compensation method for a display panel according to any one of claims 1 to 9, characterized in that: The total current of the picture to be displayed is the current on the first power bus or the second power bus during the previous frame display of the picture to be displayed.

11. The brightness compensation method for a display panel according to any one of claims 1 to 9, characterized in that: The performing brightness compensation on the sub-pixel according to the compensation coefficient corresponding to the sub-pixel includes: determining target display data corresponding to the sub-pixel according to the compensation coefficient corresponding to the sub-pixel and the grayscale to be displayed corresponding to the sub-pixel, wherein the target display data includes a target data voltage or a target display grayscale; The sub-pixels are driven according to the target display data.

12. A display panel, characterized in that: Brightness compensation is performed using the brightness compensation method for a display panel according to any one of claims 1 to 11; The display panel includes a driver chip, which is electrically connected to the first power bus and / or the second power bus and is configured to obtain a total current on the first power bus or the second power bus.

13. The display panel according to claim 12, wherein: The display panel includes monochromatic sub-pixels of at least two luminous colors, each monochromatic sub-pixel including a light-emitting device and a pixel circuit, the pixel circuit being electrically connected to a first electrode of the light-emitting device, the pixel circuit including a power input terminal connected to a first power source, and the pixel circuit being configured to drive the light-emitting device to emit light according to a power signal input from the power input terminal; and a second electrode of the light-emitting device being connected to a second power source; The second electrodes of the light-emitting devices of different luminous colors are insulated from each other; and / or the power input terminals of the pixel circuits to which the light-emitting devices of different luminous colors are connected are insulated from each other.

14. The display panel according to claim 13, wherein: The display area of ​​the display panel is divided into a plurality of sub-display areas; The second electrodes of the light-emitting devices of the same luminous color in different sub-display areas are insulated from each other, and the second electrodes of the light-emitting devices of the same luminous color in different sub-display areas are connected to different second power supplies through different second sub-power buses; And / or, in different sub-display areas, the power input ends of the pixel circuits connected to the light-emitting devices of the same light-emitting color are insulated from each other, and in different sub-display areas, the power input ends of the pixel circuits connected to the light-emitting devices of the same light-emitting color are connected to different first power supplies through different first sub-power buses.

Images