Display panel and driving method thereof

Abstract

The present invention discloses a display panel and a driving method thereof. The driving method of the display panel includes: obtaining a display grayscale, a display brightness value, and a display ratio corresponding to a picture to be displayed; wherein the display ratio is positively correlated with the number of sub-pixels that need to be illuminated for the picture to be displayed; determining a compensation coefficient corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio; and compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel. The technical solution of the present invention realizes compensation of the display brightness of the sub-pixel according to the display grayscale, the display brightness value, and the display ratio of the picture to be displayed, so as to reduce the influence of the change in the voltage difference between the two ends of the sub-pixel on the display brightness of the sub-pixel when the equivalent resistance of the power transmission line changes due to the display brightness value and / or display ratio of the picture to be displayed under the display grayscale corresponding to the picture to be displayed, thereby helping to improve the display effect.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a driving method thereof. Background Art

[0002] Organic Light Emitting Display (OLED) and flat-panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, power saving, thin body, and wide range of applications, becoming the mainstream display device.

[0003] However, the display effects of current OLED display products still need to be improved. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel and a driving method thereof to compensate for differences in display brightness caused by different display images, thereby improving display effects.

[0005] In a first aspect, an embodiment of the present invention provides a method for driving a display panel, comprising:

[0006] Obtaining a display grayscale, display brightness value, and display ratio corresponding to the image to be displayed; wherein the display ratio is positively correlated with the number of sub-pixels to be illuminated for the image to be displayed;

[0007] determining a compensation coefficient corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio;

[0008] The display brightness of the sub-pixel is compensated based on the compensation coefficient corresponding to the sub-pixel.

[0009] Optionally, the display ratio includes a first display ratio, which is equal to the ratio of the number of sub-pixels that need to be lit for the image to be displayed to the total number of sub-pixels;

[0010] Alternatively, the display ratio includes a second display ratio, which is equal to the ratio of the number of sub-pixels with the same light emission that need to be lit for the image to be displayed to the total number of sub-pixels with the same light emission;

[0011] Alternatively, the display area of ​​the display panel includes multiple display partitions, and the display ratio includes a third display ratio, which is equal to the ratio of the number of sub-pixels with the same light emission that need to be lit in the display partition for the image to be displayed to the total number of sub-pixels with the same light emission in the display partition.

[0012] Optionally, determining the compensation coefficient corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio includes:

[0013] determining a voltage division change rate corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio, wherein the voltage division change rate is a change rate of an actual voltage difference across the sub-pixel relative to a reference voltage difference;

[0014] The brightness compensation ratio required for the sub-pixel is determined according to the voltage division change rate corresponding to the sub-pixel, and the compensation coefficient corresponding to the sub-pixel is obtained.

[0015] Optionally, determining the voltage division change rate corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio includes:

[0016] determining a numerical relationship among the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel based on a voltage division relationship between the out-of-plane resistance and the in-plane resistance of the display panel;

[0017] Determining a function model of a voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio based on a correspondence between different display brightness values ​​and the in-plane resistance, a correspondence between different display ratios and the in-plane resistance, and a numerical relationship between the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel;

[0018] Calculating the voltage division change rate corresponding to the sub-pixel according to a function model of the voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio, and the display grayscale, the display brightness value, and the display ratio corresponding to the image to be displayed;

[0019] The out-of-plane resistance includes the resistance of a signal transmission line between the first power input terminal of the display panel and the first power terminal of the sub-pixel, and the in-plane resistance includes the total resistance of the sub-pixels connected in parallel in the display area of ​​the display panel.

[0020] Preferably, when the display ratio corresponds to a first display ratio, the in-plane resistance is the total resistance of all the sub-pixels connected in parallel in the display area of ​​the display panel;

[0021] When the display ratio corresponds to a second display ratio, the in-plane resistance is the total resistance of all sub-pixels in the display area that are connected in parallel and have the same light emission;

[0022] When the display ratio corresponds to a third display ratio, the display area includes a plurality of display sub-regions, and the in-plane resistance is the total resistance of all sub-pixels in the display sub-regions that are connected in parallel and emit the same light.

[0023] Optionally, determining the numerical relationship between the out-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel based on the voltage-dividing relationship between the out-plane resistance and the in-plane resistance of the display panel includes:

[0024] determining a numerical relationship between the out-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel based on a voltage divider relationship between the out-plane resistance and the in-plane resistance when the display panel displays at a reference display brightness value and a reference display ratio at a preset display grayscale;

[0025] The determining, based on the correspondence between different display brightness values ​​and the in-plane resistance, the correspondence between different display ratios and the in-plane resistance, and the numerical relationship between the out-of-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel, a functional model of the voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio includes:

[0026] determining, based on a correspondence between a display brightness value and the in-plane resistance, and a numerical relationship between the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel, a first voltage difference across the sub-pixel when the display panel displays at a preset display brightness value and a reference display ratio at the preset display grayscale;

[0027] Determining, based on a correspondence between a display brightness value and the in-plane resistance, a correspondence between a display ratio and the in-plane resistance, and a numerical relationship between the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel, a second voltage difference across the sub-pixel when the display panel displays at a preset display brightness value and a preset display ratio at the preset display grayscale;

[0028] Using the ratio of the second voltage difference to the first voltage difference as a function model of the voltage division change rate of the sub-pixel at the preset display grayscale with respect to the preset display brightness value and the preset display ratio;

[0029] Wherein, under the preset display grayscale, when the display panel displays at the preset display ratio, the display grayscale corresponding to the sub-pixels of the preset display ratio is the preset display grayscale, and the display grayscale corresponding to the remaining sub-pixels is 0 grayscale;

[0030] When the display grayscale and display ratio corresponding to the display image remain unchanged, the magnitude of the in-plane resistance is negatively correlated with the magnitude of the display brightness value; when the display grayscale and display brightness value corresponding to the display image remain unchanged, the magnitude of the in-plane resistance is negatively correlated with the magnitude of the display ratio;

[0031] Preferably, when the display grayscale and display ratio corresponding to the display screen remain unchanged, the magnitude of the in-plane resistance is negatively correlated with the magnitude of the display brightness change rate, and the display brightness change rate is the ratio of the preset display brightness value to the reference display brightness value.

[0032] Optionally, the numerical relationship between the out-of-plane resistance, the in-plane resistance and the voltage difference across the sub-pixel is expressed as:

[0033]

[0034] Wherein, Real ELVDD_U represents the reference voltage difference across the sub-pixel corresponding to when the display panel displays at the reference display brightness value and the reference display ratio at the preset display grayscale, R1 represents the in-plane resistance, R0 represents the out-of-plane resistance, ΔV=ELVDD-ELVSS, ELVDD represents the first power supply voltage input to the first power supply input terminal of the display panel, and ELVSS represents the second power supply voltage input to the second power supply terminal of the sub-pixel;

[0035] The function model of the voltage division change rate of the sub-pixel at the preset display grayscale with respect to the preset display brightness value and the preset display ratio is expressed as:

[0036]

[0037]

[0038]

[0039] Among them, U_Ratio represents the voltage division change rate of the corresponding sub-pixel when the display panel displays the preset display brightness value and the preset display ratio under the preset display grayscale, Real ELVDD_U' represents the first voltage difference, S_ratio represents the display brightness change rate, Real ELVDD_U2' represents the second voltage difference, and ratio represents the preset display ratio.

[0040] Optionally, determining the brightness compensation ratio required for the sub-pixel according to the voltage division change rate corresponding to the sub-pixel to obtain the compensation coefficient corresponding to the sub-pixel includes:

[0041] Determining a brightness compensation ratio required for the sub-pixel based on a correspondence between the display brightness of the sub-pixel and the voltage difference across the sub-pixel and a voltage division change rate corresponding to the sub-pixel;

[0042] Using the brightness compensation ratio as a compensation coefficient corresponding to the sub-pixel;

[0043] The display brightness of the sub-pixel is positively correlated with the square of the voltage difference between the two ends of the sub-pixel. The brightness compensation ratio is expressed as: 1 / U_Ratio 2 .

[0044] Optionally, compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel includes:

[0045] adjusting the data voltage at the display grayscale corresponding to the image to be displayed based on the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the adjusted data voltage; or

[0046] adjusting the display grayscale corresponding to the image to be displayed based on the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the adjusted display grayscale;

[0047] Preferably, the adjusted display grayscale corresponding to the picture to be displayed is expressed as:

[0048] Gray*(1 / U_Ratio 2 ) 1 / 2.2 ;

[0049] Here, Gray represents the display grayscale corresponding to the image to be displayed before adjustment.

[0050] In a second aspect, an embodiment of the present invention provides a display panel that is driven by the display panel driving method described in the first aspect.

[0051] Optionally, the display panel includes sub-pixels of at least two luminous colors, each sub-pixel including a light-emitting device and a pixel circuit, the pixel circuit being connected to a first electrode of the light-emitting device, the pixel circuit including a first power supply terminal, the first power supply input terminal of the display panel being used to transmit a voltage to the first power supply terminal, and the second electrode of the light-emitting device being connected to a second power supply terminal;

[0052] The first power supply terminals of the pixel circuits connected to the light-emitting devices of different luminous colors are insulated from each other; and / or the second electrodes of the light-emitting devices of different luminous colors are insulated from each other;

[0053] Preferably, the display area of ​​the display panel includes multiple display partitions; in different display partitions, the first power supply terminals of the pixel circuits connected to the light-emitting devices with the same light-emitting color are insulated from each other; and / or, in different display partitions, the second electrodes of the light-emitting devices with the same light-emitting color are insulated from each other.

[0054] The display panel and driving method provided by the embodiments of the present invention determine the compensation coefficient corresponding to the sub-pixel according to the display grayscale, display brightness value and display ratio of the picture to be displayed, and compensate the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel. The display panel can take into account the factors that affect the voltage drop on the power transmission line caused by the display grayscale, display brightness value and display ratio, and compensate the display brightness of the sub-pixel according to the display grayscale, display brightness value and display ratio of the picture to be displayed. In this way, when the equivalent resistance of the power transmission line changes due to the display brightness value and / or display ratio of the picture to be displayed, the influence of the change in the voltage difference between the two ends of the sub-pixel on the display brightness of the sub-pixel is reduced under the display grayscale corresponding to the picture to be displayed, thereby helping to improve the display effect.

[0055] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] Figure 1 is a schematic flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0058] Figure 2 is a structural schematic diagram of a display panel provided by an embodiment of the present invention;

[0059] Figure 3 yes Figure 2 Schematic diagram of equivalent circuit of the display panel shown;

[0060] Figure 4 is a structural diagram of another display panel provided by an embodiment of the present invention;

[0061] Figure 5 yes Figure 4 Schematic diagram of equivalent circuit of the display panel shown;

[0062] Figure 6 is a structural diagram of another display panel provided by an embodiment of the present invention;

[0063] Figure 7 is a schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0064] Figure 8 is a schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0065] Figure 9 is a schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0066] Figure 10 yes Figure 4 Schematic diagram of an equivalent circuit of all red sub-pixels connected in parallel in a display panel shown;

[0067] Figure 11 is a schematic structural diagram of a sub-pixel provided by an embodiment of the present invention;

[0068] Figure 12 This is a curve diagram showing the relationship between power supply voltage and display ratio provided by an embodiment of the present invention;

[0069] Figure 13 2 is a schematic diagram of the structure of another sub-pixel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0070] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0071] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0072] As described in the background art, the display effect of existing display products still needs to be improved. The inventors have found that under different display conditions, the voltage difference between the two ends of the sub-pixel varies, resulting in the sub-pixel display brightness failing to meet the requirements, affecting the display effect. The above problem occurs because the display panel needs to input a power supply voltage and transmit the power supply voltage to each sub-pixel in the display area to drive the sub-pixel to emit light, so that the display panel can display. When the display panel is displaying, a driving current flows through the power supply voltage transmission line (hereinafter referred to as the power supply transmission line), and the power supply transmission line has resistance, resulting in a voltage drop (IR drop) on the power supply transmission line. Different display conditions (such as display grayscale, display brightness value, and display ratio) will affect the current size of the power supply transmission line or the size of the equivalent resistance of the power supply transmission line. As a result, under different display conditions, the voltage drop generated on the power supply transmission line is different, and the voltage difference between the two ends of the sub-pixel is also different. As a result, the actual display brightness of the sub-pixel cannot meet the requirements, affecting the display effect.

[0073] In view of this, an embodiment of the present invention provides a method for driving a display panel to compensate for the difference in display brightness caused by different display images, thereby improving the display effect. Figure 1 FIG is a flow chart of a method for driving a display panel provided by an embodiment of the present invention. Figure 1 , the driving method of the display panel specifically includes the following steps:

[0074] S110 , obtaining a display grayscale, a display brightness value, and a display ratio corresponding to the image to be displayed.

[0075] The display ratio is positively correlated with the number of sub-pixels that need to be lit to display the image.

[0076] Specifically, the picture to be displayed can be understood as the picture that the display panel is about to display. The display area of ​​the display panel has multiple sub-pixels, and the display grayscale corresponding to the picture to be displayed can be the display grayscale corresponding to each sub-pixel. The display brightness value corresponding to the picture to be displayed can be used to characterize the overall brightness of the display picture. The display ratio corresponding to the picture to be displayed is positively correlated with the number of sub-pixels that need to be lit for the picture to be displayed, that is, the more sub-pixels that need to be lit for the picture to be displayed, the larger the display ratio corresponding to the picture to be displayed, and the fewer sub-pixels that need to be lit for the picture to be displayed, the smaller the display ratio corresponding to the picture to be displayed.

[0077] S120 , determining a compensation coefficient corresponding to a sub-pixel according to a display grayscale, a display brightness value, and a display ratio.

[0078] As described above, different display conditions can affect the current magnitude of the power transmission line, or the magnitude of the equivalent resistance of the power transmission line, resulting in different voltage drops on the power transmission line and different voltage differences across the sub-pixels under different display conditions, thereby affecting the display brightness of the sub-pixels. For example, the size of the displayed grayscale is related to the magnitude of the data voltage driving the sub-pixel, that is, the current magnitude of the power transmission line. As a result, at different display grayscales, the voltage drops on the power transmission line and the voltage differences across the sub-pixels are different, thereby affecting the display brightness of the sub-pixels. The display brightness value is related to the current magnitude of the power transmission line. When the power supply voltage input to the display panel remains unchanged, the current of the power transmission line is inversely proportional to the equivalent resistance of the power transmission line. That is, the current magnitude of the power transmission line is related to the magnitude of the equivalent resistance of the power transmission line. This results in different voltage drops on the power transmission line and different voltage differences across the sub-pixels under different display conditions, thereby affecting the display brightness of the sub-pixels. The display ratio is positively correlated with the number of sub-pixels that need to be lit in the display image. The number of sub-pixels in the lit state affects the equivalent resistance of the power transmission line, resulting in different voltage drops on the power transmission line under different display conditions. The voltage difference across the sub-pixels is also different, thus affecting the display brightness of the sub-pixels.

[0079] In this embodiment, the compensation coefficient corresponding to the sub-pixel is determined based on the display grayscale, display brightness value, and display scale corresponding to the image to be displayed, taking into account the impact of the display grayscale, display brightness value, and display scale on the voltage drop on the power transmission line. The compensation coefficient is such that, after the sub-pixel is subsequently compensated for display brightness according to the compensation coefficient corresponding to the sub-pixel, the difference between the actual display brightness corresponding to the sub-pixel in the image to be displayed and the target display brightness is less than a set threshold. In some optional embodiments, the compensation coefficient is such that, after the sub-pixel is subsequently compensated for display brightness according to the compensation coefficient corresponding to the sub-pixel, the difference between the actual display brightness corresponding to the sub-pixel in the image to be displayed and the target display brightness is zero.

[0080] S130 , compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel.

[0081] Among them, there are multiple ways to compensate the display brightness of sub-pixels based on the compensation coefficients corresponding to the sub-pixels. In one optional embodiment, the correspondence between the compensation coefficients and the compensation amounts can be pre-stored; in another optional embodiment, an algorithm for calculating the compensation amounts based on the compensation coefficients can be set, and after obtaining the compensation coefficients corresponding to the sub-pixels, the compensation amounts are calculated based on the compensation coefficients and the set algorithm. The above-mentioned compensation amounts can be the data voltage compensation amounts corresponding to the pixel circuits of the sub-pixels, or the display grayscale compensation amounts. When driving the display panel to display the picture to be displayed, the data voltage corresponding to the pixel circuits of the sub-pixels is compensated according to the data voltage compensation amounts, or the display grayscale corresponding to the sub-pixels is compensated according to the display grayscale compensation amounts, so that the display brightness of the sub-pixels in the picture to be displayed can reach the target display brightness.

[0082] The driving method of the display panel provided in this embodiment determines the compensation coefficient corresponding to the sub-pixel according to the display grayscale, display brightness value and display ratio of the picture to be displayed, and compensates the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel. This method can take into account the factors that affect the voltage drop on the power transmission line caused by the display grayscale, display brightness value and display ratio, and compensate the display brightness of the sub-pixel according to the display grayscale, display brightness value and display ratio of the picture to be displayed. In this way, when the equivalent resistance of the power transmission line changes due to the display brightness value and / or display ratio of the picture to be displayed, the influence of the change in the voltage difference between the two ends of the sub-pixel on the display brightness of the sub-pixel is reduced under the display grayscale corresponding to the picture to be displayed, thereby helping to improve the display effect.

[0083] Figure 2 is a structural schematic diagram of a display panel provided by an embodiment of the present invention; Figure 3 yes Figure 2 The equivalent circuit diagram of the display panel shown below. Figure 2 and Figure 3 , a display panel structure applied to an embodiment of the present invention is described. Exemplarily, the display area AA of the display panel includes a plurality of sub-pixels 10, Figure 2 and Figure 3The figure schematically shows a case where the display panel has three sub-pixels 10 with different luminous colors, that is, the sub-pixels 10 may specifically include a red sub-pixel 11, a green sub-pixel 12, and a blue sub-pixel 13. Each sub-pixel 10 includes a light-emitting device and a pixel circuit. The pixel circuit is used to drive the corresponding light-emitting device to emit light. The light-emitting device may specifically be an organic light-emitting diode (OLED). The red sub-pixel 11 includes a red light-emitting device R, the green sub-pixel 12 includes a green light-emitting device G, and the blue sub-pixel 13 includes a blue light-emitting device B. The first power input terminal 20 of the display panel inputs a first power supply voltage, and the second power input terminal 30 inputs a second power supply voltage. The first power supply voltage is greater than the second power supply voltage, for example, the first power supply voltage is greater than 0V, and the second power supply voltage is less than or equal to 0V. The first power input terminal 20 can be connected to the first power supply terminal IN1 of each sub-pixel 10 through a signal line, and the second power input terminal 30 can be connected to the second power supply terminal IN2 of each sub-pixel 10 through a signal line. Figure 3 The embodiment shows a case where the first electrode of the driving transistor DT in the pixel circuit serves as the first power supply terminal IN1 of the sub-pixel 10, and the second electrode of the light-emitting device is connected to the second power supply terminal IN2 of the sub-pixel 10. The light-emitting device includes a first electrode and a second electrode, the first electrode can be an anode, and the second electrode can be a cathode. The power supply voltage transmission line mentioned in the above embodiment, i.e., the power transmission line, can be a signal transmission line between the first power input terminal 20 and the sub-pixel 10, wherein the sub-pixel 10 itself also serves as part of the power transmission line.

[0084] Combine Figure 2 and Figure 3 Optionally, the display ratio includes a first display ratio, which is equal to the ratio of the number of sub-pixels 10 to be illuminated for the image to be displayed to the total number of sub-pixels 10. The display ratio can be understood as the On-Pixel Ratio (OPR), and the first display ratio is the ratio of the total number of sub-pixels 10 to be illuminated in the display area AA to the total number of all sub-pixels 10. In this embodiment, since the first power input terminal 20 is electrically connected to the first power terminal IN1 of each sub-pixel 10, and the second power input terminal 30 is electrically connected to the second power terminal IN2 of each sub-pixel 10, the first power terminal IN1 of each sub-pixel 10 is connected to each other, and the second power terminal IN2 of each sub-pixel 10 is connected to each other, that is, all sub-pixels 10 in the display area AA are connected in parallel. Figure 3The red sub-pixel 11 shown may represent all parallel red sub-pixels 11 in the display panel, and the same applies to the green sub-pixels 12 and blue sub-pixels 13. For example, the parallel resistance of all red sub-pixels 11 is denoted as R11, the parallel resistance of all green sub-pixels 12 is denoted as R12, and the parallel resistance of all blue sub-pixels 13 is denoted as R13. The out-of-plane resistance of the display panel is denoted as R0, and the in-plane resistance is denoted as R1 (R1, R11, R12, and R13 are not shown in the figure). The out-of-plane resistance R0 includes the resistance of the signal transmission line between the first power input terminal 20 and the first power terminal IN1 of the sub-pixel 10, and the in-plane resistance R1 includes the total resistance of the sub-pixels 10 connected in parallel in the display area AA. The current I flowing through the out-of-plane resistance R0 is I1+I2+I3. Here, I1 is the total current of all parallel red sub-pixels 11, I2 is the total current of all parallel green sub-pixels 12, and I3 is the total current of all parallel blue sub-pixels 13. The in-plane resistance R1 can be expressed as:

[0085]

[0086] Let the first power supply voltage inputted by the first power supply input terminal 20 be ELVDD, and the second power supply voltage inputted by the second power supply input terminal be ELVSS. Then, ELVDD-ELVSS=I*(R0+R1). The display ratio of the display image affects the magnitude of the in-plane resistance R1, thereby affecting the voltage drop on the signal transmission line between the first power supply input terminal 20 and the first power supply terminal IN1 of the sub-pixel 10. In other words, it affects the voltage division between the in-plane resistance R1 and the out-of-plane resistance R0, thereby affecting the voltage difference across the sub-pixel 10 and the display brightness of the sub-pixel 10. For example, when all red sub-pixels 11 and green sub-pixels 12 in the display area AA are lit and the blue sub-pixel 13 is not lit, the first display ratio is equal to the ratio of the total number of all red sub-pixels 11 and green sub-pixels 12 to the total number of all red sub-pixels 11, green sub-pixels 12 and blue sub-pixels 13. At this time, R13=0. Compared with the case of the same display grayscale, the same display brightness value and the first display ratio of 100%, the value of the in-plane resistance R1 increases, I3=0, the current I flowing through the out-of-plane resistance R0 decreases, the voltage divider of the out-of-plane resistance R0 decreases, and the voltage divider of the in-plane resistance R1 increases, so that the actual power supply voltage Real ELVDD input to the first power supply terminal IN1 of the sub-pixel 10 increases, and the voltage difference between the two ends of the sub-pixel 10, that is, the difference between the actual power supply voltage Real ELVDD and the second power supply voltage ELVSS, increases, thereby causing the brightness of the sub-pixel 10 to become brighter. It can be seen that under the conditions of the same display grayscale and the same display brightness value, the in-plane resistance R1 corresponding to the display screen with different display ratios is different, resulting in different voltage differences across the sub-pixel 10, resulting in different actual display brightness of the sub-pixel 10 under different display ratios, and there is also a difference between the actual display brightness of the sub-pixel under the same display ratio and the ideal display brightness.

[0087] The display brightness value of the display screen will also affect the size of the in-plane resistance R1. In this embodiment, the display brightness value (DBV) may correspond to a display brightness of the maximum grayscale in the display panel. Under different DBVs, the display brightness corresponding to the maximum grayscale of the display panel is different. When the display brightness corresponding to the maximum grayscale in the display panel changes, the display brightness corresponding to other grayscales will also change. Display devices such as mobile phones and computers usually include a brightness adjustment button or brightness bar, and users use the brightness adjustment button or brightness bar to adjust the overall display brightness of the display device. Each touch action on the brightness adjustment button or drag action on the brightness bar corresponds to an input DBV. For example, compared with a display screen with the same display grayscale and the same display ratio, when the display brightness value corresponding to the display screen decreases, the sum of I1+I2+I3 decreases, that is, the current I flowing through the out-of-plane resistance R0 decreases, while the values ​​of the first power supply voltage ELVDD, the second power supply voltage ELVSS and the out-of-plane resistance R0 remain unchanged. It can be seen from ELVDD-ELVSS=I*(R0+R1) that the in-plane resistance R1 is inversely proportional to I, and the in-plane resistance R1 will increase, thereby affecting the actual power supply voltage RealELVDD inputted at the first power supply terminal IN1 of the sub-pixel 10, and affecting the size of the voltage difference between the two ends of the sub-pixel 10, thereby causing the brightness of the sub-pixel 10 to change. It can be seen that under the conditions of the same display grayscale and the same display ratio, the in-plane resistance R1 corresponding to the display screen with different display brightness values ​​is different, resulting in different voltage differences across the sub-pixel 10, causing different display brightness values ​​to have different degrees of influence on the actual display brightness of the sub-pixel 10, so that at the same display brightness value, there is a difference between the actual display brightness of the sub-pixel 10 and the ideal display brightness, and at different display brightness values, the difference between the actual display brightness of the sub-pixel 10 and the ideal display brightness is different.

[0088] The magnitude of the display grayscale corresponds to the magnitude of the data voltage input to the gate of the driving transistor DT. For a display screen with the same display ratio and the same display brightness value, when the display grayscale changes, the data voltage changes, causing the sum of I1+I2+I3 to change. In other words, the current I flowing through the out-of-plane resistor R0 changes, thereby changing the voltage divided by the in-plane resistor R1 and the out-of-plane resistor R0. This causes the actual power supply voltage Real ELVDD input to the first power supply terminal IN1 of the sub-pixel 10 to vary, and the voltage difference across the sub-pixel 10 to vary, resulting in a change in the brightness of the sub-pixel 10. Therefore, under the conditions of the same display ratio and display brightness value, different display grayscales will also cause different voltage differences across the sub-pixel 10, resulting in different degrees of impact on the actual display brightness of the sub-pixel 10. As a result, at the same display grayscale, the actual display brightness of the sub-pixel 10 differs from the ideal display brightness, and at different display grayscales, the difference between the actual display brightness of the sub-pixel 10 and the ideal display brightness varies.

[0089] Therefore, the display grayscale, display brightness value and display ratio corresponding to the picture to be displayed can be obtained (when the display ratio corresponds to the first display ratio, the obtained display ratio is the first display ratio), and the compensation coefficient corresponding to the sub-pixel 10 is determined according to the display grayscale, display brightness value and first display ratio corresponding to the picture to be displayed, and the display brightness of the sub-pixel 10 is compensated based on the compensation coefficient corresponding to the sub-pixel 10, and the influence of the display grayscale, display brightness value and display ratio on the in-plane resistance R1 and the voltage difference across the sub-pixel 10 is taken into account, so as to reduce the influence of the change in the voltage difference across the sub-pixel 10 on the actual display brightness of the sub-pixel when the in-plane resistance R1 changes due to the change in the display brightness value and / or display ratio of the picture to be displayed under the display grayscale corresponding to the picture to be displayed, thereby helping to improve the display effect.

[0090] Figure 4 is a structural diagram of another display panel provided by an embodiment of the present invention; Figure 5 yes Figure 4 The driving method of the display panel provided by the present invention is also applicable to driving Figure 4 The display panel shown works. Figure 4 and Figure 5The display panel includes sub-pixels 10 of at least two luminous colors, and the first power supply terminals IN1 of the sub-pixels 10 emitting different luminous colors are insulated from each other. For example, when the sub-pixels 10 include a red sub-pixel 11, a green sub-pixel 12, and a blue sub-pixel 13, the display panel includes three first power supply input terminals 20. The first power supply input terminal 20a can be connected to the first power supply terminals IN1 of each red sub-pixel 11 via a signal line, the first power supply input terminal 20b can be connected to the first power supply terminals IN1 of each green sub-pixel 12 via a signal line, and the first power supply input terminal 20c can be connected to the first power supply terminals IN1 of each blue sub-pixel 13 via a signal line, so that the first power supply terminals IN1 of the sub-pixels 10 emitting the same luminous color are electrically connected to each other, and the first power supply terminals IN1 of the sub-pixels 10 emitting different luminous colors are insulated from each other. Among them, the first power input terminal 20a inputs the first power voltage ELVDD1, the first power input terminal 20b inputs the first power voltage ELVDD2, and the first power input terminal 20c inputs the first power voltage ELVDD3. The voltage values ​​corresponding to the first power voltage ELVDD1, the first power voltage ELVDD2 and the first power voltage ELVDD3 can be the same or different.

[0091] Furthermore, the second power supply terminals IN2 of sub-pixels 10 emitting different colors can be insulated from each other. For example, the display panel can further include three second power supply input terminals 30, wherein the second power supply input terminal 30a can be connected to the second power supply terminals IN2 of each red sub-pixel 11 via a signal line, the second power supply input terminal 30b can be connected to the second power supply terminals IN2 of each green sub-pixel 12 via a signal line, and the second power supply input terminal 30c can be connected to the second power supply terminals IN2 of each blue sub-pixel 13 via a signal line. This allows the second power supply terminals IN2 of sub-pixels 10 emitting the same color to be electrically connected, while the second power supply terminals IN2 of sub-pixels 10 emitting different colors are insulated from each other. The second power supply input terminal 30a inputs the second power supply voltage ELVSS1, the second power supply input terminal 30b inputs the second power supply voltage ELVSS2, and the second power supply input terminal 30c inputs the second power supply voltage ELVSS3. The voltage values ​​corresponding to the second power supply voltages ELVSS1, ELVSS2, and ELVSS3 can be the same or different.

[0092] Combine Figure 4 and Figure 5Optionally, the display ratio includes a second display ratio, which is equal to the ratio of the number of sub-pixels 10 of the same color that need to be illuminated for the image to be displayed to the total number of sub-pixels 10 of the same color. For example, when the sub-pixels 10 include red sub-pixels 11, green sub-pixels 12, and blue sub-pixels 13, each color sub-pixel 10 corresponds to a second display ratio. For each color sub-pixel 10, its corresponding second display ratio is equal to the ratio of the number of sub-pixels 10 of that color that need to be illuminated for the image to be displayed to the total number of sub-pixels 10 of that color. When the display ratio is the second display ratio, the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed can be obtained. For any color sub-pixel 10, the compensation coefficient corresponding to the sub-pixel 10 of that color is determined based on the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed, and the display brightness of the sub-pixel 10 of that color is compensated based on the compensation coefficient corresponding to the sub-pixel 10 of that color.

[0093] When the first power supply terminals IN1 of the sub-pixels 10 of different luminous colors are insulated from each other and / or the second power supply terminals IN2 of the sub-pixels 10 of different luminous colors are insulated from each other, the sub-pixels 10 of different luminous colors are independent of each other, so that the out-of-plane resistances and in-plane resistances corresponding to the sub-pixels 10 of different luminous colors are independent of each other. Optionally, when the display ratio corresponds to the second display ratio, for sub-pixels 10 of any color, the out-of-plane resistance is the resistance of the signal transmission line between the first power supply terminal IN1 of the sub-pixel 10 of that color and the first power input terminal 20 to which it is connected, and the in-plane resistance is the total resistance of all sub-pixels 10 of that color connected in parallel in the display area AA. Figure 5The red sub-pixel 11 shown may represent all parallel red sub-pixels 11 in the display panel, and the same applies to the green sub-pixels 12 and blue sub-pixels 13. For example, for all red sub-pixels 11, their out-of-plane resistance is R01, their in-plane resistance R11 is the parallel resistance of all red sub-pixels 11, and the total current of all parallel red sub-pixels 11 is I1; for all green sub-pixels 12, their out-of-plane resistance is R02, their in-plane resistance R12 is the parallel resistance of all green sub-pixels 12, and the total current of all parallel green sub-pixels 12 is I2; for all blue sub-pixels 13, their out-of-plane resistance is R03, their in-plane resistance R13 is the parallel resistance of all blue sub-pixels 13 (R11, R12, and R13 are not shown in the figure), and the total current of all parallel blue sub-pixels 13 is I3. It can be seen that when the in-plane resistance corresponding to a sub-pixel 10 of one luminous color changes, the in-plane resistance corresponding to the sub-pixels 10 of other colors does not change accordingly, and the total currents of the sub-pixels 10 of different luminous colors do not affect each other. By isolating the first power supply terminals IN1 of the sub-pixels 10 of different luminous colors from each other and / or isolating the second power supply terminals IN2 of the sub-pixels 10 of different luminous colors from each other, the mutual influence between the sub-pixels 10 of different luminous colors can be reduced, which is conducive to improving the display effect.

[0094] Figure 6 This is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention. Figure 4The display panel shown can further include a display area AA including multiple display sub-areas AA0, wherein the first power supply terminals of sub-pixels 10 emitting the same color in different display sub-areas AA0 are insulated from each other; and / or the second power supply terminals of sub-pixels 10 emitting the same color in different display sub-areas AA0 are insulated from each other. This can further reduce the mutual influence between sub-pixels 10 in different display sub-areas AA0, thereby further improving the display effect. Optionally, the display ratio includes a third display ratio, which is equal to the ratio of the number of sub-pixels 10 emitting the same color that need to be illuminated in display sub-area AA0 to display the image to be displayed to the total number of sub-pixels 10 emitting the same color in display sub-area AA0. For example, in each display sub-area AA0, each color of sub-pixel 10 corresponds to a third display ratio. For each color of sub-pixel 10, the corresponding third display ratio is equal to the ratio of the number of sub-pixels 10 of that color that need to be illuminated in that display sub-area AA0 to display the image to the total number of sub-pixels 10 of that color in that display sub-area AA0. When the display ratio is the third display ratio, the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed can be obtained. For each sub-pixel 10 of any color in each display sub-area AA0, a compensation coefficient corresponding to the sub-pixel 10 of that color is determined based on the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed, and the display brightness of the sub-pixel 10 of that color is compensated based on the compensation coefficient corresponding to the sub-pixel 10 of that color. Optionally, when the display ratio corresponds to the third display ratio, for each sub-pixel 10 of any color in each display sub-area AA0, the out-of-plane resistance is the resistance of the signal transmission line between the first power supply terminal IN1 of the sub-pixel 10 of that color and the first power supply input terminal 20 to which it is connected, and the in-plane resistance is the total resistance of all sub-pixels 10 of that color connected in parallel in the display sub-area AA0.

[0095] Based on the above embodiments, there are many specific implementations of the display panel driving method, several of which are described below.

[0096] Figure 7 FIG is a flow chart of another method for driving a display panel provided by an embodiment of the present invention. Figure 7 , the method specifically comprises the following steps:

[0097] S210: Obtain the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed.

[0098] S220 , determining a voltage division change rate corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio, where the voltage division change rate is a change rate of an actual voltage difference across the sub-pixel relative to a reference voltage difference.

[0099] For each display grayscale, the reference voltage difference may be the voltage difference across the sub-pixel when the display panel displays at a reference display brightness value and a reference display ratio. The reference display brightness value and the reference display ratio may be set according to the display brightness value and display ratio of the display image under normal circumstances. Figure 2 and Figure 3 , exemplarily, the voltage difference across the sub-pixel 10 may be the voltage difference between the first electrode and the second electrode of the light-emitting device, which voltage difference is approximately equal to the voltage difference between the first power supply terminal IN1 and the second power supply terminal IN2 of the sub-pixel 10. Optionally, the actual voltage difference across the sub-pixel 10 is the difference between the actual power supply voltage RealELVDD input to the first power supply terminal IN1 of the sub-pixel 10 and the second power supply voltage ELVSS input to the second power supply terminal IN2.

[0100] From the analysis above, it can be seen that the display grayscale corresponding to the image to be displayed will affect the current flowing through the off-plane resistor, thereby affecting the voltage difference across the sub-pixel and affecting the brightness of the sub-pixel. The display brightness value and display ratio corresponding to the image to be displayed will affect the size of the in-plane resistor, thereby affecting the voltage difference across the sub-pixel and affecting the brightness of the sub-pixel. In other words, the display grayscale, display brightness value and display ratio will all affect the voltage divider value of the in-plane resistor of the display panel, thereby affecting the voltage difference across the sub-pixel and the brightness of the sub-pixel. Therefore, the actual voltage difference across the sub-pixel corresponding to the image to be displayed can be determined based on the display grayscale, display brightness value and display ratio corresponding to the image to be displayed, so as to determine the rate of change of the actual voltage difference across the sub-pixel relative to the reference voltage difference, that is, the voltage divider change rate.

[0101] S230 , determining a brightness compensation ratio required for the sub-pixel according to a voltage division change rate corresponding to the sub-pixel, and obtaining a compensation coefficient corresponding to the sub-pixel.

[0102] Since there is a corresponding relationship between the brightness of a sub-pixel and the voltage difference across the sub-pixel, the brightness compensation ratio required for the sub-pixel can be determined based on the voltage division change rate corresponding to the sub-pixel, and the brightness compensation ratio is determined as the compensation coefficient corresponding to the sub-pixel. The magnitude of the brightness compensation ratio must satisfy the following requirement: after compensating the display brightness of the sub-pixel of the image to be displayed based on the brightness compensation ratio, the change in the display brightness of the sub-pixel caused by the voltage division change rate corresponding to the sub-pixel can be reduced or eliminated.

[0103] S240 , compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel.

[0104] The technical solution of this embodiment takes into account the influence of the display grayscale, display brightness value and display ratio of the image to be displayed on the voltage divider value of the in-plane resistance of the display panel, and accordingly obtains the rate of change of the actual voltage difference across the sub-pixel relative to the reference voltage difference, thereby determining the brightness compensation ratio required for the sub-pixel, and using the brightness compensation ratio as the compensation coefficient corresponding to the sub-pixel to compensate the display brightness of the sub-pixel, so as to reduce the brightness difference of display images with different display brightness values ​​and / or different display ratios under the same display grayscale, thereby improving the display effect of the image to be displayed.

[0105] Figure 8 FIG is a flow chart of another method for driving a display panel provided by an embodiment of the present invention. Figure 8 , the method specifically comprises the following steps:

[0106] S310: Obtain the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed.

[0107] S320 : Determine a numerical relationship among the out-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel based on a voltage divider relationship between the out-plane resistance and the in-plane resistance of the display panel.

[0108] For example, in combination Figure 2 and Figure 3 Based on the voltage difference between the first power input terminal 20 and the second power input terminal 30 of the display panel, and the ratio of the out-plane resistance R0 to the in-plane resistance R1 of the display panel, the voltage divider value of the out-plane resistance R0 and the voltage divider value of the in-plane resistance R1 can be determined, and the voltage divider value of the in-plane resistance is approximately equal to the voltage difference across the sub-pixel 10. Therefore, based on the voltage divider relationship between the out-plane resistance and the in-plane resistance of the display panel, the numerical relationship among the out-plane resistance, the in-plane resistance and the voltage difference across the sub-pixel can be determined.

[0109] S330. Determine a function model of the sub-pixel voltage division change rate with respect to the display brightness value and the display ratio based on the correspondence between different display brightness values ​​and the in-plane resistance, the correspondence between different display ratios and the in-plane resistance, and the numerical relationship between the out-of-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel.

[0110] The voltage division change rate is the change rate of the actual voltage difference between the two ends of the sub-pixel relative to the reference voltage difference.

[0111] When the display grayscale and display ratio corresponding to the displayed image remain unchanged, changes in the display brightness value will cause changes in the in-plane resistance R1 of the display panel. Since the display brightness value is positively correlated with the magnitude of the current I flowing through the out-of-plane resistance R0, according to the above analysis, the magnitude of the in-plane resistance R1 is negatively correlated with the magnitude of I. Therefore, the display brightness value and the in-plane resistance R1 are negatively correlated. When the display grayscale and display brightness value corresponding to the displayed image remain unchanged, changes in the display ratio will cause changes in the in-plane resistance R1 of the display panel. According to the above analysis, the display ratio and the in-plane resistance R1 are negatively correlated.

[0112] Therefore, for each display grayscale, the correspondence between different display brightness values ​​and in-plane resistance, the correspondence between different display ratios and in-plane resistance, and the numerical relationship between the out-of-plane resistance, in-plane resistance and the voltage difference across the sub-pixel are combined to obtain a function model of the sub-pixel voltage divider change rate with respect to the display brightness value and display ratio. The display brightness value and display ratio in this function model are both variables.

[0113] S340 , calculating the voltage division change rate corresponding to the sub-pixel according to the function model of the voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio, and the display grayscale, display brightness value and display ratio corresponding to the image to be displayed.

[0114] For each display grayscale, after obtaining the function model of the sub-pixel's voltage division change rate with respect to the display brightness value and the display ratio, the function model of the corresponding sub-pixel's voltage division change rate with respect to the display brightness value and the display ratio can be determined according to the display grayscale corresponding to the picture to be displayed, and the display brightness value and display ratio corresponding to the picture to be displayed are substituted into the function model for calculation to obtain the voltage division change rate corresponding to the sub-pixel.

[0115] S350 , determining a brightness compensation ratio required for the sub-pixel according to a voltage division change rate corresponding to the sub-pixel, and obtaining a compensation coefficient corresponding to the sub-pixel.

[0116] S360: Compensate the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel.

[0117] Figure 9 FIG is a flow chart of another method for driving a display panel provided by an embodiment of the present invention. Figure 9 , the method specifically comprises the following steps:

[0118] S410: Obtain the display grayscale, display brightness value, and display ratio corresponding to the image to be displayed.

[0119] S420. Determine a numerical relationship between the out-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel based on a voltage divider relationship between the out-plane resistance and the in-plane resistance when the display panel displays at a reference display brightness value and a reference display ratio at a preset display grayscale.

[0120] The preset display grayscale may be any grayscale from 0 to 255, the reference display brightness value may be any value from the minimum DBV to the maximum DBV of the display panel, and the reference display ratio may be any value from 0 to 100%. Figure 10 yes Figure 4 The equivalent circuit diagram of all parallel red sub-pixels in the display panel is shown below. Figure 4 and Figure 10 , the brightness compensation method of the red sub-pixel 11 in the display panel is described with a preset display grayscale of 255 grayscales, a reference display brightness value of 500nit, and a reference display ratio of 100%.

[0121] Exemplarily, at grayscale 255, the display panel is controlled to display at a display ratio of 100% and a display brightness value of 500 nit, that is, all red sub-pixels 11 are lit, and the display grayscale corresponding to each red sub-pixel 11 is grayscale 255.

[0122] Optionally, the numerical relationship between the out-of-plane resistance, the in-plane resistance and the voltage difference across the sub-pixel is expressed as:

[0123]

[0124] Here, Real ELVDD_U represents the reference voltage difference across the corresponding subpixel when the display panel displays at a reference display brightness value and a reference display ratio at a preset display grayscale. In this embodiment, Real ELVDD_U is the voltage difference across the corresponding red subpixel 11 when the display panel displays at a 100% display ratio and a display brightness value of 500 nits at a grayscale of 255. ΔV = ELVDD - ELVSS, where ELVDD represents the first power supply voltage input to the first power input terminal 20a of the display panel, and ELVSS represents the second power supply voltage input to the second power supply terminal 30a of the subpixel. R1 represents the in-plane resistance, and R0 represents the out-of-plane resistance. In this embodiment, R1 and R0 can both be the in-plane resistance and out-of-plane resistance corresponding to the red subpixel 11.

[0125] Furthermore, based on the correspondence between the display brightness value and the in-plane resistance, the correspondence between the display ratio and the in-plane resistance, and the numerical relationship between the out-of-plane resistance, the in-plane resistance and the voltage difference across the sub-pixel, the third voltage difference across the sub-pixel can be determined when the display panel displays with a reference display brightness value and a preset display ratio at a preset display grayscale.

[0126] The preset display ratio may be any value between 0 and 100%, and may be the same as or different from the reference display ratio. Optionally, the preset display ratio is a variable. Under the preset display grayscale, when the display panel displays at the preset display ratio, the display grayscale corresponding to the sub-pixels of the preset display ratio is the preset display grayscale, and the display grayscale corresponding to the remaining sub-pixels is 0 grayscale.

[0127] From the analysis above, it can be seen that when the display grayscale and display brightness value corresponding to the display image remain unchanged, the magnitude of the in-plane resistance is negatively correlated with the magnitude of the display ratio. Let the preset display ratio be denoted as ratio. When the display grayscale remains at the preset display grayscale, the display brightness value remains at the reference display brightness value, and the display ratio changes from the reference display ratio to the preset display ratio ratio, the in-plane resistance corresponding to each red sub-pixel 11 changes from R1 to R1 / ratio, where the value of ratio ranges from 0 to 100%. Based on this, the third voltage difference can be calculated as:

[0128]

[0129] Among them, the out-of-plane resistance R0 remains unchanged, and Real ELVDD_U2 represents the voltage difference across the corresponding sub-pixel when the display panel displays at a reference display brightness value and a preset display ratio at a preset display grayscale. Corresponding to this embodiment, Real ELVDD_U is the voltage difference across the corresponding red sub-pixel 11 when the display panel displays at a preset display ratio ratio and a display brightness value of 500nit at a grayscale of 255.

[0130] S430. Determine, based on the correspondence between the display brightness value and the in-plane resistance, and the numerical relationship between the out-of-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel, a first voltage difference across the sub-pixel when the display panel displays at a preset display brightness value and a reference display ratio at a preset display grayscale.

[0131] Among them, the preset display brightness value can be any value between the minimum DBV and the maximum DBV of the display panel. The preset display brightness value can be the same as the reference display brightness value or different from the reference display brightness value. Optionally, the preset display brightness value is a variable. From the analysis above, it can be seen that when the display grayscale and display ratio corresponding to the display screen remain unchanged, the size of the in-plane resistance is negatively correlated with the size of the display brightness value. Furthermore, when the display grayscale and display ratio corresponding to the display screen remain unchanged, the size of the in-plane resistance is negatively correlated with the size of the display brightness change rate, and the display brightness change rate is the ratio of the preset display brightness value to the reference display brightness value. Let the display brightness change rate be denoted as S_ratio, the preset display brightness value be denoted as DBV2, and the reference display brightness value be denoted as DBV1, then S_ratio=DBV2 / DBV1. For example, when the preset display brightness value is 100nit and the reference display brightness value is 500nit, S_ratio=100nit / 500nit. After the display grayscale remains at the preset display grayscale, the display ratio remains at the reference display ratio, and the display brightness value changes from the reference display brightness value to the preset display brightness value, the in-plane resistance corresponding to each red sub-pixel 11 changes from R1 to R1 / S_ratio, where the value of S_ratio is between 0-100%.

[0132] Based on this, the first voltage difference can be calculated as:

[0133]

[0134] Here, Real ELVDD_U′ represents the first voltage difference.

[0135] S440. Determine, based on the correspondence between the display brightness value and the in-plane resistance, the correspondence between the display ratio and the in-plane resistance, and the numerical relationship between the out-of-plane resistance, the in-plane resistance and the voltage difference across the sub-pixel, the second voltage difference across the sub-pixel when the display panel displays at a preset display brightness value and a preset display ratio under a preset display grayscale.

[0136] When the display grayscale remains at the preset display grayscale, the display ratio changes from the reference display ratio to the preset display ratio, and the display brightness value changes from the reference display brightness value to the preset display brightness value, the in-plane resistance corresponding to each red sub-pixel 11 changes from R1 to (R1 / ratio) / S_ratio. Based on this, the second voltage difference across the sub-pixel can be calculated as:

[0137]

[0138] Here, Real ELVDD_U2′ represents the second voltage difference.

[0139] S450: Using the ratio of the second voltage difference to the first voltage difference as a function model of the voltage division change rate of the sub-pixel at the preset display grayscale with respect to the preset display brightness value and the preset display ratio.

[0140] The function model of the voltage division change rate of the sub-pixel at the preset display grayscale with respect to the preset display brightness value and the preset display ratio can be expressed as:

[0141]

[0142] Where U_Ratio represents the rate of change in the voltage division of the corresponding sub-pixel when the display panel displays at a preset display brightness value and a preset display ratio at a preset display grayscale. Combining equations (3) through (5) yields the specific expression for U_Ratio. The magnitude of U_Ratio is related to the out-of-plane resistance R0, the in-plane resistance R1, the preset display ratio ratio, the display brightness change rate S_ratio, and ΔV.

[0143] S460 , determining a brightness compensation ratio required for the sub-pixel according to a corresponding relationship between the display brightness of the sub-pixel and the voltage difference across the sub-pixel and a voltage division change rate corresponding to the sub-pixel.

[0144] When performing display brightness compensation on the red sub-pixel 11 in the image to be displayed, the out-of-plane resistance R0 and the in-plane resistance R1 corresponding to the red sub-pixel 11 can be determined when the display panel displays at a reference display brightness value and a reference display ratio under a preset display grayscale. The display ratio corresponding to the image to be displayed is used as the preset display ratio, and the display brightness value corresponding to the image to be displayed is used as the preset display brightness value. The values ​​are substituted into formula (5) to calculate U_Ratio.

[0145] Figure 11 Schematic diagram of a sub-pixel structure provided by an embodiment of the present invention. Figure 11 The sub-pixel includes a pixel circuit and a light-emitting device D. The pixel circuit includes a driving transistor DT and a storage capacitor Cst. The voltage between the drain and source of the driving transistor DT can be recorded as Vds, the voltage between the two ends of the light-emitting device D can be recorded as Voled, the actual power supply voltage input to the first power supply terminal IN1 of the sub-pixel can be recorded as Real ELVDD, and the display brightness of the sub-pixel can be recorded as Lum. The voltage difference between the two ends of the sub-pixel is Real ELVDD-ELVSS. Taking ELVSS=0V as an example, the voltage difference between the two ends of the sub-pixel is Real ELVDD. Since Voled∝Real ELVDD, and Lum∝Voled 2 ∝(Real ELVDD-Vds) 2 ∝RealELVDD 2Therefore, the display brightness Lum of the sub-pixel is equal to the square of the voltage difference between the two ends of the sub-pixel Real ELVDD 2 There is a positive correlation.

[0146] Under the preset display grayscale, when the display panel displays the preset display brightness value and the preset display ratio, the corresponding sub-pixel voltage division change rate is U_Ratio. Since the display brightness Lum of the sub-pixel is equal to the square of the voltage difference between the two ends of the sub-pixel, Real ELVDD 2 In order to reduce or eliminate the change in the display brightness of the sub-pixel caused by the change rate of the voltage division corresponding to the sub-pixel, the brightness compensation ratio can be set to 1 / U_Ratio 2 .

[0147] Figure 12 This is a graph showing the relationship between power supply voltage and display ratio, provided by an embodiment of the present invention. The first power supply voltage ELVDD inputted to the first power input terminal of the display panel remains constant, while the actual power supply voltage Real ELVDD inputted to the first power terminal IN1 of the subpixel decreases as the display ratio increases. This graph is applicable to any subpixel in various embodiments of the present invention.

[0148] S470: Use the brightness compensation ratio as a compensation coefficient corresponding to the sub-pixel.

[0149] S480 , compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel.

[0150] Optionally, in one embodiment, step S480 includes: adjusting the data voltage at the display grayscale corresponding to the image to be displayed based on the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the adjusted data voltage. For example, the initial data voltage corresponding to the display grayscale of the image to be displayed and the compensation coefficient corresponding to the sub-pixel 1 / U_Ratio 2 The target data voltage corresponding to the sub-pixel is determined, and when displaying the image to be displayed, the target data voltage is provided to the pixel circuit of the sub-pixel to compensate for the brightness difference of the sub-pixel.

[0151] In another embodiment, step S480 includes: adjusting the display grayscale corresponding to the image to be displayed based on the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the adjusted display grayscale. Exemplarily, the display grayscale corresponding to the image to be displayed is adjusted to the target display grayscale according to the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the data voltage corresponding to the target display grayscale, thereby achieving display brightness compensation of the sub-pixel. Optionally, the adjusted display grayscale corresponding to the image to be displayed (e.g., the target display grayscale) is expressed as:

[0152] Gray*(1 / U_Ratio 2 ) 1 / 2.2 ;

[0153] Gray represents the display grayscale before adjustment corresponding to the image to be displayed.

[0154] In practical applications, the preset display grayscale can be a set of binding point grayscales from grayscale 0 to grayscale 255. For different binding point grayscales, the numerical value corresponding to the binding point grayscale is substituted into the preset display grayscale, and steps S420 to S450 are performed respectively to obtain the voltage division change rate U_Ratio of the red sub-pixel corresponding to each binding point grayscale when the display panel displays at the preset display brightness value and the preset display ratio. For the remaining display grayscales from grayscale 0 to grayscale 255 except the binding point grayscale, a linear difference calculation can be performed based on the voltage division change rate U_Ratio corresponding to each binding point grayscale to obtain the voltage division change rate U_Ratio corresponding to the remaining display grayscales.

[0155] It should be noted that the above embodiment only takes the red sub-pixel as an example, and schematically illustrates the display brightness compensation method of the red sub-pixel. For sub-pixels of other colors, the principle of display brightness compensation is the same. The details can be understood by referring to the above embodiment, and no further details will be given.

[0156] Based on the same inventive concept, an embodiment of the present invention further provides a display panel, which is driven by the display panel driving method in any of the above embodiments.

[0157] Optionally, the display panel includes sub-pixels of at least two luminous colors, the sub-pixels include a light-emitting device and a pixel circuit, the pixel circuit is connected to the first electrode of the light-emitting device, the pixel circuit includes a first power supply terminal, the first power supply input terminal of the display panel is used to transmit voltage to the first power supply terminal, and the second electrode of the light-emitting device is connected to the second power supply terminal.

[0158] The first power supply terminals of the pixel circuits connected to the light-emitting devices with different luminous colors are insulated from each other; and / or the second electrodes of the light-emitting devices with different luminous colors are insulated from each other.

[0159] Optionally, the display area of ​​the display panel includes multiple display partitions; in different display partitions, the first power supply terminals of the pixel circuits connected to the light-emitting devices with the same light-emitting color are insulated from each other; and / or, in different display partitions, the second electrodes of the light-emitting devices with the same light-emitting color are insulated from each other.

[0160] Figure 13 is a schematic diagram of another sub-pixel structure provided by an embodiment of the present invention, and this sub-pixel structure is also applicable to the technical solution of the present invention. Figure 13The sub-pixel includes a pixel circuit and a light-emitting device D. The pixel circuit includes a driving transistor DT, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, and a storage capacitor Cst. The first transistor T1 is used to transmit a data voltage Vdata to the gate of the driving transistor DT, the second transistor T2 is used to compensate for the threshold voltage of the driving transistor DT, the third transistor T3 is used to transmit an initialization voltage Vref to the gate of the driving transistor DT, the fourth transistor T4 is used to transmit the initialization voltage Vref to the first electrode of the light-emitting device D, and the fifth and sixth transistors T5 and T6 are used to control light emission. In this pixel circuit, the first electrode of the fifth transistor T5 can serve as the first power supply terminal IN1 of the sub-pixel.

[0161] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0162] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for driving a display panel, characterized in that: include: Obtaining a display grayscale, display brightness value, and display ratio corresponding to the image to be displayed; wherein the display ratio is positively correlated with the number of sub-pixels to be illuminated for the image to be displayed; determining a compensation coefficient corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio; Compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel; Determining a compensation coefficient corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio includes: determining a voltage division change rate corresponding to the sub-pixel according to the display grayscale, the display brightness value, and the display ratio, wherein the voltage division change rate is a change rate of an actual voltage difference across the sub-pixel relative to a reference voltage difference; The brightness compensation ratio required for the sub-pixel is determined according to the voltage division change rate corresponding to the sub-pixel, and the compensation coefficient corresponding to the sub-pixel is obtained.

2. The method for driving a display panel according to claim 1, wherein: The display ratio includes a first display ratio, which is equal to the ratio of the number of sub-pixels that need to be lit for the image to be displayed to the total number of sub-pixels; Alternatively, the display ratio includes a second display ratio, which is equal to the ratio of the number of sub-pixels with the same light emission that need to be lit for the image to be displayed to the total number of sub-pixels with the same light emission; Alternatively, the display area of ​​the display panel includes multiple display partitions, and the display ratio includes a third display ratio, which is equal to the ratio of the number of sub-pixels with the same light emission that need to be lit in the display partition for the image to be displayed to the total number of sub-pixels with the same light emission in the display partition.

3. The method for driving a display panel according to claim 1, wherein: The determining, according to the display grayscale, the display brightness value, and the display ratio, a voltage division change rate corresponding to the sub-pixel includes: determining a numerical relationship among the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel based on a voltage division relationship between the out-of-plane resistance and the in-plane resistance of the display panel; Determining a function model of a voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio based on a correspondence between different display brightness values ​​and the in-plane resistance, a correspondence between different display ratios and the in-plane resistance, and a numerical relationship between the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel; Calculating the voltage division change rate corresponding to the sub-pixel according to a function model of the voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio, and the display grayscale, the display brightness value, and the display ratio corresponding to the image to be displayed; The out-of-plane resistance includes the resistance of the signal transmission line between the first power input terminal of the display panel and the first power terminal of the sub-pixel, and the in-plane resistance includes the total resistance of each of the sub-pixels connected in parallel in the display area of ​​the display panel.

4. The method for driving a display panel according to claim 3, wherein: When the display ratio corresponds to a first display ratio, the in-plane resistance is the total resistance of all the sub-pixels connected in parallel in the display area of ​​the display panel; When the display ratio corresponds to a second display ratio, the in-plane resistance is the total resistance of all sub-pixels in the display area that are connected in parallel and have the same light emission; When the display ratio corresponds to a third display ratio, the display area includes a plurality of display sub-regions, and the in-plane resistance is the total resistance of all sub-pixels in the display sub-regions that are connected in parallel and emit the same light.

5. The method for driving a display panel according to claim 4, wherein: The determining, based on the voltage-dividing relationship between the out-plane resistance and the in-plane resistance of the display panel, the numerical relationship among the out-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel comprises: determining a numerical relationship between the out-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel based on a voltage divider relationship between the out-plane resistance and the in-plane resistance when the display panel displays at a reference display brightness value and a reference display ratio at a preset display grayscale; The determining, based on the correspondence between different display brightness values ​​and the in-plane resistance, the correspondence between different display ratios and the in-plane resistance, and the numerical relationship between the out-of-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel, a functional model of the voltage division change rate of the sub-pixel with respect to the display brightness value and the display ratio includes: determining, based on a correspondence between a display brightness value and the in-plane resistance, and a numerical relationship between the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel, a first voltage difference across the sub-pixel when the display panel displays at a preset display brightness value and a reference display ratio at the preset display grayscale; Determining, based on a correspondence between a display brightness value and the in-plane resistance, a correspondence between a display ratio and the in-plane resistance, and a numerical relationship between the out-of-plane resistance, the in-plane resistance, and a voltage difference across the sub-pixel, a second voltage difference across the sub-pixel when the display panel displays at a preset display brightness value and a preset display ratio at the preset display grayscale; Using the ratio of the second voltage difference to the first voltage difference as a function model of the voltage division change rate of the sub-pixel at the preset display grayscale with respect to the preset display brightness value and the preset display ratio; Wherein, under the preset display grayscale, when the display panel displays at the preset display ratio, the display grayscale corresponding to the sub-pixels of the preset display ratio is the preset display grayscale, and the display grayscale corresponding to the remaining sub-pixels is 0 grayscale; When the display grayscale and display ratio corresponding to the display screen remain unchanged, the size of the in-plane resistance is negatively correlated with the size of the display brightness value; when the display grayscale and display brightness value corresponding to the display screen remain unchanged, the size of the in-plane resistance is negatively correlated with the size of the display ratio.

6. The method for driving a display panel according to claim 5, wherein: When the display grayscale and display ratio corresponding to the display screen remain unchanged, the magnitude of the in-plane resistance is negatively correlated with the magnitude of the display brightness change rate, and the display brightness change rate is the ratio of the preset display brightness value to the reference display brightness value.

7. The method for driving a display panel according to claim 6, wherein: The numerical relationship between the out-of-plane resistance, the in-plane resistance, and the voltage difference across the sub-pixel is expressed as: ； Wherein, Real ELVDD_U represents the reference voltage difference across the sub-pixel corresponding to when the display panel displays at the reference display brightness value and the reference display ratio at the preset display grayscale, R1 represents the in-plane resistance, R0 represents the out-of-plane resistance, ΔV=ELVDD-ELVSS, ELVDD represents the first power supply voltage input to the first power supply input terminal of the display panel, and ELVSS represents the second power supply voltage input to the second power supply terminal of the sub-pixel; The function model of the voltage division change rate of the sub-pixel at the preset display grayscale with respect to the preset display brightness value and the preset display ratio is expressed as follows: ； ； ； Among them, U_Ratio represents the voltage division change rate of the corresponding sub-pixel when the display panel displays the preset display brightness value and the preset display ratio under the preset display grayscale, Real ELVDD_U' represents the first voltage difference, S_ratio represents the display brightness change rate, Real ELVDD_U2' represents the second voltage difference, and ratio represents the preset display ratio.

8. The method for driving a display panel according to claim 7, wherein: The step of determining the brightness compensation ratio required for the sub-pixel according to the voltage division change rate corresponding to the sub-pixel to obtain the compensation coefficient corresponding to the sub-pixel includes: Determining a brightness compensation ratio required for the sub-pixel based on a correspondence between the display brightness of the sub-pixel and the voltage difference across the sub-pixel and a voltage division change rate corresponding to the sub-pixel; Using the brightness compensation ratio as a compensation coefficient corresponding to the sub-pixel; The display brightness of the sub-pixel is positively correlated with the square of the voltage difference between the two ends of the sub-pixel. The brightness compensation ratio is expressed as: 1 / U_Ratio 2 .

9. The method for driving a display panel according to claim 8, wherein: The compensating the display brightness of the sub-pixel based on the compensation coefficient corresponding to the sub-pixel includes: adjusting the data voltage at the display grayscale corresponding to the image to be displayed based on the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the adjusted data voltage; or The display grayscale corresponding to the image to be displayed is adjusted based on the compensation coefficient corresponding to the sub-pixel, so as to drive the display panel to display the image to be displayed according to the adjusted display grayscale.

10. The method for driving a display panel according to claim 9, wherein: The adjusted display grayscale corresponding to the image to be displayed is expressed as: Gray*(1 / U_Ratio 2 ) 1 / 2.2 ; Here, Gray represents the display grayscale corresponding to the image to be displayed before adjustment.

11. A display panel, characterized in that: The display panel is driven by the driving method according to any one of claims 1 to 10.

12. The display panel according to claim 11, wherein: The display panel includes sub-pixels of at least two luminous colors, each sub-pixel including a light-emitting device and a pixel circuit, the pixel circuit being connected to a first electrode of the light-emitting device, the pixel circuit including a first power supply terminal, the first power input terminal of the display panel being used to transmit a voltage to the first power supply terminal, and the second electrode of the light-emitting device being connected to a second power supply terminal; The first power supply terminals of the pixel circuits connected to the light-emitting devices with different luminous colors are insulated from each other; and / or the second electrodes of the light-emitting devices with different luminous colors are insulated from each other.

13. The display panel according to claim 12, wherein: The display area of ​​the display panel includes multiple display partitions; in different display partitions, the first power supply terminals of the pixel circuits connected to the light-emitting devices with the same luminous color are insulated from each other; and / or, in different display partitions, the second electrodes of the light-emitting devices with the same luminous color are insulated from each other.

Images