A method for obtaining a driving voltage of a display panel, a driving chip and a display panel

Abstract

This application provides a method for obtaining the driving voltage of a display panel, a driving chip, and a display panel. The method includes: obtaining a first characteristic function corresponding to a first grayscale level; obtaining a second compensation function corresponding to a second grayscale level based on the first characteristic function; and determining a target data voltage corresponding to the second grayscale level based on the second compensation function. This application determines the data voltage of the light-emitting driving current that can maintain white balance by setting characteristic functions and compensation functions corresponding to different grayscale levels. This method of quickly determining the target data voltage corresponding to each grayscale level based on characteristic functions and compensation functions helps reduce workload and improve work efficiency. It also helps ensure the accuracy of the light-emitting brightness of the light-emitting device, helps maintain white balance at different grayscale levels, and improves the display effect of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a method for obtaining the driving voltage of a display panel, a driving chip, and a display panel. Background Technology

[0002] Adjusting the power supply voltage ELVSS used by the display panel can reduce its power consumption. For example, when the power supply voltage ELVSS is negative, reducing its absolute value can lower the voltage across the display panel, thus reducing power consumption. However, reducing the absolute value of the power supply voltage ELVSS will cause a decrease in the absolute value of the source-drain voltage drop of the driving transistor. According to the transistor's output characteristics, when the driving transistor operates in the saturation region, the light-emitting driving current generated by the driving transistor is not a constant value, but will decrease as the absolute value of the source-drain voltage drop decreases. That is, the slope of the light-emitting driving current / source-drain voltage drop in the saturation region is not zero. This means that under the same data voltage, using a smaller absolute value of the power supply voltage ELVSS will also result in a lower absolute value of the source-drain voltage drop of the driving transistor, and a corresponding decrease in the light-emitting driving current, thus altering the brightness of the light-emitting device. Therefore, it is necessary to compensate for the brightness of the light-emitting device when adjusting the power supply voltage ELVSS to ensure the accuracy of the light-emitting device's brightness.

[0003] However, in display panels, different gray levels correspond to different display brightness. Testing the display brightness at each gray level and determining the corresponding compensation value based on attenuation is laborious and not conducive to efficient brightness compensation. Therefore, it is particularly important to propose a method that can efficiently and accurately determine the compensation value of the luminous brightness corresponding to each gray level. Summary of the Invention

[0004] In view of this, this application provides a method for obtaining the driving voltage of a display panel, a driving chip, and a display panel to solve the above problems.

[0005] In a first aspect, embodiments of this application provide a method for obtaining a display panel driving voltage. The display panel includes multiple pixel circuits, and each pixel circuit includes a driving transistor. The driving transistor is used to receive data voltage and to generate light-emitting driving current.

[0006] The methods include:

[0007] Obtain the first characteristic function corresponding to the first gray level;

[0008] Based on the first characteristic function, the second compensation function corresponding to the second gray level is obtained;

[0009] The target data voltage corresponding to the second gray level is determined based on the second compensation function.

[0010] In one implementation of the first aspect, the display panel further includes a light-emitting device. When the driving transistor generates a light-emitting driving current, the first electrode of the driving transistor is electrically connected to the first electrode of the light-emitting device, and one of the second electrode of the driving transistor and the second electrode of the light-emitting device receives a first power supply voltage and the other receives a second power supply voltage.

[0011] Obtain the first characteristic function corresponding to the first gray level, including:

[0012] The first characteristic function is determined based on the initial voltage drop and initial light-emitting driving current corresponding to the first gray level in the initial state, and the first voltage drop and first light-emitting driving current corresponding to the first gray level in the target state. The first power supply voltage corresponding to the first gray level in the target state is different from the first power supply voltage corresponding to the first gray level in the initial state. The voltage drop is the voltage drop between the source and drain of the driving transistor. The variables of the first characteristic function include the voltage drop and the light-emitting driving current.

[0013] In one implementation of the first aspect, the method further includes:

[0014] Based on the first characteristic function, the first compensation function is obtained;

[0015] The target data voltage corresponding to the first gray level is determined based on the first compensation function;

[0016] In one implementation of the first aspect, determining the target data voltage corresponding to the first gray level based on the first characteristic function includes:

[0017] The first compensation function is determined based on the first voltage drop across the first electrode, the initial light-emitting driving current, and the first characteristic function. The first compensation function differs from the first output function only in its constant term, and the first voltage drop across the first electrode and the initial light-emitting driving current satisfy the first compensation function.

[0018] Based on the first compensation function and the initial voltage drop across the electrodes, determine the compensation light-emitting driving current corresponding to the first gray level;

[0019] The target data voltage corresponding to the first gray level is determined based on the compensation light-emitting driving current corresponding to the first gray level.

[0020] In one implementation of the first aspect, determining the target data voltage corresponding to the second gray level based on the first characteristic function includes:

[0021] The second characteristic function corresponding to the second gray level is determined based on the first characteristic function corresponding to the first gray level.

[0022] The second compensation function is determined based on the first voltage drop across the first electrode, the initial light-emitting driving current, and the second characteristic function corresponding to the second gray level. The second compensation function differs from the second characteristic function only in its constant term, and the first voltage drop across the first electrode and the initial light-emitting driving current satisfy the second compensation function.

[0023] Based on the second compensation function and the initial voltage drop across the two electrodes corresponding to the second gray level, determine the compensation light-emitting driving current corresponding to the second gray level;

[0024] The target data voltage corresponding to the second gray level is determined based on the compensation light-emitting driving current corresponding to the second gray level.

[0025] In one implementation of the first aspect, the compensation light-emitting driving current corresponding to the second gray level is determined based on the second compensation function and the initial voltage drop across the electrodes corresponding to the second gray level, including:

[0026] Substituting the initial voltage drop across the two electrodes corresponding to the second gray level into the second compensation function, we obtain the compensation light-emitting driving current corresponding to the second gray level.

[0027] In one implementation of the first aspect, determining the target data voltage corresponding to the second gray level based on the compensated light-emitting driving current corresponding to the second gray level includes:

[0028] Obtain the first function; the brightness corresponding to different gray levels and their corresponding preset light-emitting driving current satisfy the first function;

[0029] The brightness corresponding to the second gray level is determined based on the first function and the compensation light-emitting driving current corresponding to the second gray level.

[0030] Based on the brightness corresponding to the second gray level, the target data voltage corresponding to the second gray level.

[0031] In one implementation of the first aspect, a second compensation function is obtained based on the first characteristic function, including:

[0032] Obtain the third characteristic function corresponding to the third gray level and the fourth characteristic function corresponding to the fourth gray level;

[0033] The coefficients in the second characteristic function are determined based on the coefficients in the third, fourth, and first characteristic functions; wherein the coefficients of the same terms in the first, second, third, and fourth characteristic functions conform to the same variation pattern.

[0034] In one implementation of the first aspect, a second compensation function is obtained based on the first characteristic function, including:

[0035] The second compensation function is determined based on the first compensation function corresponding to the first characteristic function.

[0036] In one implementation of the first aspect, the law of change includes either an arithmetic progression or a geometric progression.

[0037] In one implementation of the first aspect, both the first characteristic function and the second compensation function are one of a linear function, a quadratic function, or a cubic function.

[0038] Secondly, embodiments of this application provide a driver chip, including acquiring a target data voltage using the method provided in the first aspect.

[0039] Thirdly, embodiments of this application provide a display panel that is driven by the driver chip provided in the second aspect.

[0040] Fourthly, embodiments of this application provide a display device, including a display panel as provided in the third aspect.

[0041] In this embodiment, a method is proposed to determine the compensated target data voltage corresponding to the second gray level based on a first characteristic function corresponding to the first gray level and a second compensation function corresponding to the second gray level. Setting the second compensation function for the second gray level can be determined based on the first characteristic function corresponding to the first gray level. This avoids the need to separately determine the corresponding characteristic function and then the compensation function for each gray level to obtain the target data voltage required for each gray level. It also avoids the need to perform extensive testing of data such as light-emitting driving current and brightness of light-emitting devices to determine the target data voltage for each gray level. This method of quickly determining the target data voltage for each gray level based on the characteristic function and the compensation function helps reduce workload and improve work efficiency.

[0042] Furthermore, by setting the characteristic functions and compensation functions corresponding to different gray levels, the target data voltage that enables the driving transistors at different gray levels to generate light-emitting driving currents with brightness compensation is determined. This is beneficial when adjusting the voltage drop between the source and drain of the driving transistor to reduce power consumption, ensuring that the driving transistor receives the target data voltage and generates a light-emitting driving current that allows the light-emitting device to emit light accurately, thus guaranteeing the accuracy of the light-emitting device's brightness. White balance is an indicator in a display panel that represents the accuracy of white generated by mixing the light emitted from red, green, and blue light-emitting devices. In a display panel, if the accuracy of the brightness of a certain color light-emitting device cannot be guaranteed at a certain gray level, the white balance of the display panel at that gray level will be affected accordingly, impacting the display effect. Therefore, this method also helps to maintain white balance at different gray levels, improving the display effect of the display panel. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic diagram of a display panel provided in an embodiment of this application;

[0045] Figure 2 A flowchart illustrating a method for determining the driving voltage of a display panel, provided in an embodiment of this application;

[0046] Figure 3 This is a schematic diagram of the operating curve of a driving transistor provided in an embodiment of this application;

[0047] Figure 4 An approximation proposed for an embodiment of this application Figure 3 A schematic diagram of some output characteristics in the middle region E1;

[0048] Figure 5 This application provides yet another method for obtaining the driving voltage of a display panel.

[0049] Figure 6 A flowchart illustrating a method for determining the target data voltage corresponding to a second gray level, provided in an embodiment of this application;

[0050] Figure 7 A schematic diagram of a driver chip provided in an embodiment of this application;

[0051] Figure 8 This is a schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0052] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0053] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0054] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0055] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of this specification, it should be understood that the terms "substantially", "approximately", "about", "about", "generally", "largely" used in the claims and embodiments of this application refer to values ​​that can be generally agreed upon within a reasonable range of process operations or tolerances, rather than a precise value.

[0057] It should be understood that although the terms "first," "second," etc., may be used to describe characteristic functions, compensation functions, etc., in the embodiments of this application, these characteristic functions, compensation functions, etc., should not be limited to these terms. These terms are only used to distinguish characteristic functions, compensation functions, etc., from each other. For example, without departing from the scope of the embodiments of this application, a first characteristic function may also be referred to as a second characteristic function, and similarly, a second characteristic function may also be referred to as a first characteristic function.

[0058] Figure 1 This is a schematic diagram of a display panel provided in an embodiment of this application. Figure 2 This is a flowchart illustrating a method for determining the driving voltage of a display panel, provided in an embodiment of this application. Figure 3 This is a schematic diagram of the operating curve of a driving transistor provided in an embodiment of this application. Figure 4 An approximation proposed for an embodiment of this application Figure 3 A schematic diagram of some output characteristics in region E1.

[0059] This application provides a method for obtaining the driving voltage of a display panel 100, wherein the driving voltage can be a data voltage Vdata output to the display panel, and the magnitude of the data voltage determines the brightness of the sub-pixels in the display panel.

[0060] like Figure 1 As shown, the display panel 100 includes multiple pixel circuits 200. Each pixel circuit 200 includes a driving transistor Md, which receives a data voltage Vdata and generates a light-emitting driving current I. The display panel 100 also includes a light-emitting device 300. When the driving transistor Md generates the light-emitting driving current, the first terminal of the driving transistor Md is electrically connected to the first terminal 3001 of the light-emitting device 300. One of the second terminals of the driving transistor Md and the second terminal of the light-emitting device 300 receives a first power supply voltage ELVSS, and the other receives a second power supply voltage ELVDD.

[0061] Optionally, the first terminal of the driving transistor Md is the source S and the second terminal is the drain D. The first terminal 3001 of the light-emitting device 300 is the anode. The first terminal of the driving transistor Md receives the second power supply voltage ELVDD, and the second terminal of the light-emitting device 300 receives the first power supply voltage ELVSS.

[0062] Furthermore, the light-emitting driving current I generated by the driving transistor Md can drive the light-emitting device 300 in the sub-pixel to emit light. Specifically, the driving transistor Md can generate different light-emitting driving currents I when receiving different data voltages Vdata, thereby driving the light-emitting device 300 electrically connected to the pixel circuit 200 to emit light of different brightness.

[0063] Optionally, the driving transistor Md is a P-type transistor; alternatively, the driving transistor Md is an N-type transistor. For ease of explanation, the embodiments of this application are described using a P-type driving transistor Md as an example. However, the inventive concept of this application is also applicable to the case where the driving transistor Md is an N-type transistor. That is, adaptive adjustments made to the inventive concept of this application based on the driving transistor Md being an N-type transistor are also within the protection scope of this application.

[0064] Combination Figure 2 As shown, the method for obtaining the driving voltage of the display panel 100 includes:

[0065] S1: Obtain the first characteristic function y1 corresponding to the first gray level;

[0066] In display technology, grayscale represents the pre-set brightness levels of the display panel 100 when displaying an image, typically including 0-255 grayscale levels. Optionally, the first grayscale level is the maximum grayscale value, i.e., a grayscale value of 255. In some cases, the first grayscale level can also be other grayscale values.

[0067] In the display panel 100, there are preset data voltages Vdata corresponding to each gray level. Typically, the data voltage Vdata corresponding to any gray level can be obtained through a Gamma curve. When a certain gray level needs to be displayed, the driving transistor receives the preset data voltage Vdata and drives the light-emitting device 300 to produce the corresponding brightness.

[0068] refer to Figures 3-4 As shown, the operating region of the driving transistor Md includes a variable resistance region, a cutoff region, and a saturation region D1, with the variable resistance region and the saturation region D1 bounded by the pre-pinch-off trajectory.

[0069] The output characteristic curve V when the display grayscale is the first grayscale and the driving transistor Md is operating in the saturation region D1. GS1. When the voltage drop between the gate (G) and source (S) of the driving transistor Md is constant, i.e., when the data voltage Vdata received by the driving transistor Md is constant, the corresponding relationship between the light-emitting driving current I generated by the driving transistor Md and the voltage drop between the source (S) and drain (D) of the driving transistor Md is as follows: Within the saturation region D1, due to the output characteristics of the driving transistor Md, when the voltage drop between the source (S) and drain (D) of the driving transistor Md changes, the light-emitting driving current I generated by the driving transistor Md is not constant. This can be seen from the output characteristic curve Vdata. GS 1. It can be seen that the light-emitting driving current I changes with the voltage drop between the source S and drain D of the driving transistor Md. For example, as... Figure 3 As shown, within the saturation region D1, the output characteristic curve V... GS It can be concluded that as the absolute value of the voltage drop between the source (S) and drain (D) of the driving transistor Md decreases, the absolute value of the light-emitting driving current I also decreases. In other words, when the driving transistor Md receives the same data voltage Vdata, changing the voltage drop between the source (S) and drain (D) of the driving transistor Md will cause a change in the light-emitting brightness of the light-emitting device 300, resulting in a deviation in the light-emitting brightness of the light-emitting device 300.

[0070] It should also be noted that this application uses a P-type transistor as an example for the driving transistor Md, and the source S of the driving transistor Md is at a higher potential than the drain D. Vds represents the potential difference between the drain D and the source S of the driving transistor Md, and Vds is a value less than 0. Therefore, in... Figures 3-4 -Vds represents the absolute value of the voltage drop between the drain (D) and source (S) of the driving transistor Md. -I represents the absolute value of the light-emitting driving current I generated by the driving transistor Md.

[0071] In order to improve the brightness deviation of the light-emitting device 300 mentioned above, the data voltage Vdata received by the driving transistor Md is adjusted to compensate for the light-emitting driving current I, thereby achieving accurate light-emitting brightness of the light-emitting device 300.

[0072] Therefore, in order to determine the change in the light-emitting driving current I when the driving transistor Md operates in the saturation region D1 after a certain change in the voltage drop between the source S and drain D of the driving transistor Md in the first gray level, and thus compensate for the light-emitting driving current I, a partial output characteristic curve V distributed in the saturation region D1 was set. GS The first characteristic function y1 is approximated by 1. For example... Figure 4 The first characteristic function y1 and the output characteristic curve V are represented in the figure. GS 1. The curve approximation within the saturation region D1, where the dashed line represents the output characteristic curve V. GS 1. The first characteristic function y1 is shown on the solid line.

[0073] In this technical solution, the characteristic function is a function curve that approximates the output characteristic curve of the saturation region of the driving transistor Md. The characteristic function can be used to represent the correspondence between the light-emitting driving current I generated when the driving transistor Md is working in the saturation region and the voltage drop between the source S and the drain D of the driving transistor Md. Through the characteristic function, the change of the light-emitting driving current I corresponding to the change of the voltage drop between the source S and the drain D of the driving transistor Md in the saturation region can be determined.

[0074] Therefore, in the first grayscale, the relationship between the light-emitting driving current I generated when the driving transistor Md operates in the saturation region D1 and the voltage drop between the source S and drain D of the driving transistor Md can be represented by the first characteristic function y1. The change in the light-emitting driving current I corresponding to the change in the voltage drop between the source S and drain D of the driving transistor Md when it operates in the saturation region D1 in the first grayscale can be determined using the first characteristic function y1.

[0075] The first characteristic function y1 can be obtained based on the voltage drop between the source S and drain D of the driving transistor Md corresponding to the first gray level and the corresponding light-emitting driving current I.

[0076] S2: Based on the first characteristic function y1, obtain the second compensation function x1 corresponding to the second gray level;

[0077] The compensation function represents the relationship between the compensated light-emitting drive current I and the voltage drop between the source S and drain D of the driving transistor Md. According to the compensation function, the compensated light-emitting drive current I can be determined when the voltage drop between the source S and drain D changes when the driving transistor Md is working in the saturation region D1. This will enable the light-emitting device 300 to emit light with accurate brightness.

[0078] The second gray level can represent other gray level values ​​other than the first gray level within the gray level range of the display panel 100.

[0079] The second compensation function x1 corresponding to the second gray level can be used to represent the relationship between the light-emitting driving current I, which has the function of compensating for light emission brightness, generated when the driving transistor Md operates in the saturation region D1 at the second gray level, and the voltage drop between the source S and drain D of the driving transistor Md. According to the second compensation function x1, it can be determined that, at the second gray level, changing the voltage drop between the source S and drain D of the driving transistor Md will result in the light-emitting device 300 generating a light-emitting driving current with accurate brightness.

[0080] As can be seen from the above, the first characteristic function y1 can represent the change in the light-emitting driving current I after the voltage drop between the source S and drain D of the driving transistor Md changes when the driving transistor Md operates in the saturation region D1 at the first gray level. Based on the change in the light-emitting driving current I, corresponding compensation is made to ensure the accurate luminous brightness of the light-emitting device 300.

[0081] Since different gray levels in the display panel 100 represent different brightness levels, there is a primary relationship between the brightness of different gray levels. For example, as the gray level value increases, the display brightness of the display panel 100 is higher.

[0082] Therefore, under the first gray level, based on the change in the light-emitting driving current I after the change in the voltage drop between the source S and drain D of the driving transistor Md under the first gray level, the change in the light-emitting driving current I after the change in the voltage drop between the source S and drain D of the driving transistor Md under the second gray level can be deduced, thereby determining the compensated light-emitting driving current that needs to be provided to the light-emitting device 300 under the second gray level.

[0083] Since the compensation function can be used to represent the correspondence between the compensated light-emitting driving current I and the voltage drop between the source S and drain D of the driving transistor Md, then at the second gray level, the second compensation function x1 corresponding to the second gray level can be determined based on a set of correspondences between the compensated light-emitting driving current I and the voltage drop between the source S and drain D of the driving transistor Md.

[0084] S3: Determine the target data voltage Vdata' corresponding to the second gray level based on the second compensation function x1.

[0085] Based on the second compensation function x1, the relationship between the voltage drop between the source (S) and drain (D) of the driving transistor Md when it operates in the saturation region D1 and the compensated light-emitting driving current I can be determined. When the driving transistor Md operates in the saturation region D1, it generates a light-emitting driving current I to drive the light-emitting device 300 to emit light. Therefore, based on the second compensation function x1, the value of the light-emitting driving current I generated by the driving transistor Md to compensate for brightness changes can be determined.

[0086] In the display panel 100, the light-emitting driving current I generated by the driving transistor Md is related to the data voltage Vdata. The data voltage Vdata can be used to control the value of the light-emitting driving current I generated by the driving transistor Md. Therefore, in order to make the driving transistor Md generate a compensating light-emitting driving current I in the second grayscale, the data voltage Vdata can be adjusted.

[0087] Specifically, when the driving transistor Md operates in the saturation region D1, adjusting the voltage drop between the source S and drain D of the driving transistor Md allows the driving transistor Md to generate a light-emitting driving current I with brightness compensation effect, resulting in a data voltage Vdata'. Therefore, the target data voltage Vdata' corresponding to the second grayscale is: the data voltage at the second grayscale that allows the driving transistor Md to generate a light-emitting driving current I with brightness compensation effect.

[0088] The value of the light-emitting driving current I required to generate for compensation under the second grayscale can be determined based on the second compensation function x1. Based on the required value of the light-emitting driving current I under the second grayscale, the target data voltage Vdata' that can drive the driving transistor Md to generate this light-emitting driving current I is determined.

[0089] In this embodiment, a method is proposed to determine the compensated target data voltage Vdata' corresponding to the second gray level based on the first characteristic function y1 corresponding to the first gray level and the second compensation function x1 corresponding to the second gray level. Setting the second compensation function x1 corresponding to the second gray level can be determined based on the first characteristic function y1 corresponding to the first gray level. This avoids the need to separately determine the corresponding characteristic function and then the compensation function for each gray level to obtain the target data voltage Vdata' required for each gray level, and avoids the need to perform extensive testing of data such as the light-emitting driving current I and the brightness of the light-emitting device 300 to determine the target data voltage Vdata' for each gray level. This method of quickly determining the target data voltage Vdata' for each gray level based on the characteristic function and the compensation function helps reduce workload and improve work efficiency.

[0090] Furthermore, by setting the characteristic functions and compensation functions corresponding to different gray levels, the target data voltage Vdata' that enables the driving transistor Md to generate a light-emitting driving current I with brightness compensation at different gray levels is determined. This is beneficial when adjusting the voltage drop between the source S and drain D of the driving transistor Md to reduce power consumption, ensuring that the driving transistor Md receives the target data voltage Vdata' and generates a light-emitting driving current I that allows the light-emitting device 300 to emit light accurately. This helps ensure the accuracy of the light-emitting brightness of the light-emitting device 300. White balance is an indicator in the display panel 100 representing the accuracy of white generated by mixing the light emitted by the red, green, and blue light-emitting devices. In the display panel 100, if the accuracy of the light-emitting brightness of a certain color light-emitting device 300 cannot be guaranteed at a certain gray level, the white balance of the display panel 100 at that gray level will be affected accordingly, impacting the display effect of the display panel 100. Therefore, this method also helps to maintain white balance at different gray levels, improving the display effect of the display panel 100.

[0091] Figure 5 This application provides another method for obtaining the driving voltage of a display panel.

[0092] In one embodiment of this application, the first characteristic function y1 corresponding to the first gray level is obtained, such as... Figure 5 As shown, it includes:

[0093] A1: Combination Figure 3 , Figure 4 As shown, the first characteristic function y1 is determined based on the initial voltage drop Vds1 and initial light-emitting driving current I1 corresponding to the first gray level in the initial state, and the first voltage drop Vds2 and first light-emitting driving current I2 corresponding to the first gray level in the target state.

[0094] The first power supply voltage ELVSS corresponding to the first gray level in the target state is different from the first power supply voltage ELVSS corresponding to the first gray level in the initial state. The voltage drop Vds is the voltage drop between the source S and the drain D of the driving transistor. The variables of the first characteristic function y1 include the voltage drop Vds and the light-emitting driving current I.

[0095] The initial state is the operating state when no adjustment is made to the first power supply voltage ELVSS used by the display panel 100 to reduce power consumption.

[0096] In the display panel 100, since the voltage drop between the source S and drain D of the driving transistor Md is related to the first power supply voltage ELVSS, the voltage drop between the source S and drain D of the corresponding driving transistor Md can be determined based on the first power supply voltage ELVSS; similarly, the value of the first power supply voltage ELVSS used can also be determined based on the voltage drop between the source S and drain D of the driving transistor Md.

[0097] In the first grayscale, the initial voltage drop Vds1 is the voltage drop between the source (S) and drain (D) of the driving transistor Md when the display panel 100 is operating in the initial state. The initial light-emitting driving current I1 is the light-emitting driving current generated by the driving transistor Md in the initial state.

[0098] The target state is the operating state in which the adjusted first power supply voltage ELVSS is used on the display panel 100 to reduce power consumption.

[0099] At the first grayscale, the first voltage drop across the transistor Vds2 is the voltage drop across the driving transistor Md in the target state. The first light-emitting driving current I2 is the light-emitting driving current generated by the driving transistor Md in the target state.

[0100] The first characteristic function y1 is set to be a function similar to the output characteristic curve of the partially driven transistor Md located in the saturation region D1, such as... Figure 3 As shown, due to the partial output characteristic curve V located in the saturation region D1 GS If the slope is close to a straight line, then the first characteristic function y1 can be assumed to be a linear function I = k·Vds + C1. Here, I represents the light-emitting driving current, k represents the slope of the linear function, Vds represents the voltage drop across the driving transistor Md, and C1 is the constant term of the linear function.

[0101] At the first gray level, the initial voltage drop Vds1 and the initial light-emitting driving current I1 in the initial state are substituted into the above linear function, and the first voltage drop Vds2 and the first light-emitting driving current I2 corresponding to the first gray level in the target state are also substituted into the above linear function. The slope k and the constant term C1 of the linear function can be determined through simple function calculations. Thus, the first characteristic function y1 is determined as I = k·Vds + C1.

[0102] In some other embodiments, the first characteristic function y1 may also be set as a quadratic or cubic function.

[0103] In one embodiment of this application, reference continues to be made to... Figure 5 As shown, the method also includes:

[0104] A2: Based on the first characteristic function y1, the first compensation function x2 is obtained;

[0105] As can be seen from the above, the compensation function is the light-emitting drive current I that accurately compensates for the brightness of the light-emitting device 300 when the voltage drop Vds changes between the two electrodes of the driving transistor Md when it is operating in the saturation region D1. The first compensation function x2 is the compensation function corresponding to the first gray level.

[0106] The first characteristic function y1 represents the relationship between the voltage drop Vds across the driving transistor Md and the light-emitting driving current I generated by the driving transistor Md. Both the first characteristic function y1 and the first compensation function x2 are functions corresponding to the first gray level, and the range of variation of the voltage drop Vds across the driving transistor Md in the first characteristic function y1 is the same as that in the first compensation function x2. In other words, the first characteristic function y1 can be used to determine the change in the light-emitting driving current I generated after the change in the voltage drop Vds across the driving transistor Md at the first gray level. The first compensation function can be used to determine the value of the light-emitting driving current I, which compensates for the luminous brightness of the light-emitting device 300, after the change in the voltage drop Vds across the driving transistor Md at the first gray level.

[0107] The trend of the light-emitting driving current I expressed by the first compensation function x2 is consistent with the trend of the light-emitting driving current I expressed by the first characteristic function y1.

[0108] Based on the first characteristic function y1 and the voltage drop Vds across the driving transistor Md when using the first power supply voltage ELVSS which can reduce power consumption, the change in the light-emitting driving current I generated after adjusting the voltage drop Vds across the driving transistor Md can be determined. Thus, the light-emitting driving current I that needs to be provided to compensate for the light-emitting brightness can be determined.

[0109] The relevant variables of the first compensation function x2 are also the light-emitting driving current I and the voltage drop Vds across the driving transistor Md. Therefore, the first compensation function x2 can be obtained based on the adjusted voltage drop Vds across the driving transistor Md and the required light-emitting driving current I to compensate for the light intensity.

[0110] A3: Determine the target data voltage Vdata' corresponding to the first gray level based on the first compensation function x2;

[0111] As mentioned in the above embodiment, the value of the light-emitting driving current I required to compensate for the light-emitting brightness can be determined according to the first compensation function x2.

[0112] Therefore, by determining the target data voltage Vdata' corresponding to the first gray level, and by having the driving transistor Md receive the target data voltage Vdata' corresponding to the first gray level, the required light-emitting driving current I can be obtained.

[0113] During the process of adjusting the first power supply voltage ELVSS used by the display panel 100, thereby changing the voltage drop Vds across the driving transistor Md, the change in the light-emitting driving current I is as follows:

[0114] like Figure 4 As shown, based on the change in the light-emitting driving current I as expressed by the first characteristic function y1, in the initial state, the voltage drop Vds across the driving transistor Md is the initial voltage drop Vds1, and the light-emitting driving current I generated by the driving transistor Md receiving the data voltage Vdata is the initial light-emitting driving current I1. The initial light-emitting driving current I is the light-emitting driving current I that can ensure the white balance of the first gray level before the first power supply voltage ELVSS is adjusted. When the light-emitting device 300 receives the initial light-emitting driving current I1 in the first gray level, it can complete accurate light emission and ensure white balance.

[0115] When the first power supply voltage ELVSS is adjusted to reduce power consumption, the voltage drop Vds across the driving transistor Md also becomes the first voltage drop Vds2. However, due to the output characteristics of the driving transistor Md, although the driving transistor Md receives the same data voltage Vdata as in the initial state, the generated light-emitting driving current I changes to the first light-emitting driving current I2. Obviously, the first light-emitting driving current I2 deviates from the initial light-emitting driving current I1.

[0116] Taking the absolute value of the first light-emitting driving current I2 being less than the initial light-emitting driving current I1 as an example, if we want the value of the light-emitting driving current I generated by the driving transistor Md to be the same as the value of the initial light-emitting driving current I1 that meets the light-emitting requirement when the driving transistor Md is in the target state, that is, when the voltage drop Vds is adjusted to the first voltage drop Vds2, then we need to adjust the data voltage Vdata received by the driving transistor Md under the first gray level.

[0117] The change in the light-emitting driving current I can be determined from the first characteristic curve y1.

[0118] According to the first compensation function x2, in the initial state, that is, when the voltage drop Vds across the driving transistor Md is the same as the initial voltage drop Vds, the light-emitting driving current I determined by the first compensation function x2 and the initial voltage drop Vds can be the same as the change in the light-emitting driving current I when the voltage drop Vds2 across the driving transistor Md is the same as the first voltage drop Vds. This makes the value of the changed light-emitting driving current I the same as the initial light-emitting driving current I1.

[0119] Based on the first compensation function x2, the light-emitting driving current I that can decrease to the initial light-emitting driving current I1 from the initial state to the target state can be determined. The target data voltage Vdata' corresponding to the first gray level is determined based on the required light-emitting driving current I. The driving transistor Md receives the target data voltage Vdata' corresponding to the first gray level, causing it to generate the light-emitting driving current I required to decrease to the initial light-emitting driving current I1 from the initial state to the target state in the initial state. Similarly, in the target state, it receives the target data voltage Vdata' corresponding to the first gray level and generates the same current value as the initial light-emitting driving current I1.

[0120] In one embodiment of this application, determining the target data voltage Vdata' corresponding to the first gray level based on the first characteristic function y1 includes:

[0121] Based on the first voltage drop across the first electrode Vds2, the initial light-emitting driving current I1, and the first characteristic function y1, the first compensation function x2 is determined; the first characteristic function y1 and the first compensation function x2 differ only in their constant terms, and the first voltage drop across the first electrode Vds2 and the initial light-emitting driving current I1 satisfy the first compensation function x2;

[0122] The method for determining the first characteristic function y1 corresponding to the first gray level when setting the first characteristic function y1 as a linear function, as mentioned in the above embodiments, will not be repeated here.

[0123] The first characteristic function is I = k·Vds + C1. The trend of the light-emitting driving current I, as represented by the first characteristic function y1, between the initial voltage drop Vds1 and the first voltage drop Vds2 is consistent with the trend of the light-emitting driving current I, as represented by the first compensation function x2. That is, the slopes of the first compensation function x2 and the first characteristic function y1 are the same, but the constant terms are different. Therefore, based on the first characteristic function y1, the first compensation function x2 can be set as I = k·Vds + C2, where C2 is the constant term of the first compensation function x2.

[0124] Once the constant term of the second compensation function x1 is determined, the first compensation function x2 is also determined.

[0125] Since it is desired that when the voltage drop Vds across the driving transistor Md is adjusted to the first voltage drop Vds2, the driving transistor Md can generate a light-emitting driving current I with the same value as the initial light-emitting driving current I1, the first voltage drop Vds2 and the initial light-emitting driving current I1 can be substituted into the first compensation function x2 to determine the constant term C2 of the first compensation function x2, thereby obtaining the first compensation function x2 that can determine the light-emitting driving current I with the brightness compensation effect.

[0126] It should be noted that both the first compensation function x2 and the first characteristic function y1 are functions related to the light-emitting driving current I and the voltage drop Vds across the driving transistor. When only the constant terms differ among the coefficients of the first compensation function x2 and the first characteristic function y1, the changing trends of the first compensation function x2 and the first characteristic function y1 can be consistent, and the first compensation function x2 and the first characteristic function y1 can be two parallel functions.

[0127] Based on the first compensation function x2 and the initial voltage drop across the two poles Vds1, determine the compensation light-emitting driving current I3 corresponding to the first gray level;

[0128] The compensated light-emitting driving current I3 satisfies the first compensation function x2. The compensated light-emitting driving current I3 is a current that ensures, when the voltage drop Vds across the driving transistor Md is adjusted to the first voltage drop Vds2, the compensated light-emitting driving current I3 can change to the same value as the initial light-emitting driving current I1. In other words, during the process from the initial state to the target state, the change in the compensated light-emitting driving current I3 to the initial light-emitting driving current I1 is the same as the change in the initial light-emitting driving current I1 to the first light-emitting driving current I2.

[0129] Therefore, in the first gray level, the driving transistor Md needs to generate a compensating light-emitting driving current I3 in the initial state. Thus, by substituting the initial voltage drop Vds1 into the first compensation function x2, the compensating light-emitting driving current I3 corresponding to the first gray level can be determined.

[0130] The target data voltage Vdata' corresponding to the first gray level is determined based on the compensation light-emitting driving current I3 corresponding to the first gray level.

[0131] The display panel 100 includes a pre-set data voltage Vdata corresponding to the luminous brightness. Therefore, the target data voltage Vdata' can be determined by determining the luminous brightness when the light-emitting device 300 receives the compensation light-emitting driving current I3.

[0132] In the display panel 100, the luminous brightness of the light-emitting device 300 is usually related to the light-emitting driving current I. We can set the luminous brightness of the light-emitting device and the light-emitting driving current I to satisfy the first function Lv=C3·I.

[0133] Where Lv represents the luminous intensity of the light-emitting device 300, C3 represents the coefficient of variation of the first function, and I represents the light-emitting driving current received by the light-emitting device 300.

[0134] By substituting the preset maximum brightness of the display panel 100 and the preset light-emitting drive current I received by the light-emitting device 300 at this time into the first function Lv=C3·I, the variation coefficient C3 can be determined. In the display panel 100, both the light-emitting brightness of the light-emitting device 300 and the light-emitting drive current I satisfy the first function.

[0135] Substituting the first gray-level compensation light-emitting driving current I3 into the first function, the luminance Lv generated by the light-emitting device 300 when receiving the compensation light-emitting driving current I3 at the first gray level can be obtained. Based on this luminance Lv, the corresponding data voltage Vdata can be selected as the target data voltage Vdata' for the first gray level.

[0136] The determination of the target data voltage corresponding to the first gray level based on the compensation light-emitting driving current I3 is mentioned above and will not be repeated here.

[0137] Figure 6 A flowchart illustrating a method for determining the target data voltage corresponding to a second gray level, provided in an embodiment of this application.

[0138] In one embodiment of this application, such as Figure 6 As shown, based on the first characteristic function y1, the target data voltage Vdata' corresponding to the second gray level is determined, including:

[0139] B1: Determine the second characteristic function y2 corresponding to the second gray level based on the first characteristic function y1 corresponding to the first gray level.

[0140] Continue to refer to Figure 4 As shown, the second characteristic function y2 corresponding to the second grayscale can also represent the relationship between the light-emitting driving current I and the voltage drop Vds across the driving transistor Md. The second characteristic function y2 can be used to approximate the change in the light-emitting driving current I when the voltage drop Vds across the driving transistor Md changes from the initial voltage drop Vds1 to the first voltage drop Vds2 at the second grayscale. In the display panel 100, the data voltage Vdata received by the preset driving transistor Md at the first grayscale is different from the data voltage Vdata received at the second grayscale.

[0141] Set the first characteristic function y1 and the second characteristic function y2 to be functions of the same type. For example, both the first characteristic function y1 and the second characteristic function y2 are linear functions.

[0142] The coefficients of the second characteristic function y2 are determined by the regular relationship between the coefficients of the first characteristic function y1 and the coefficients of the characteristic functions corresponding to other gray levels.

[0143] For example: Set the second characteristic function y2 as: I = k2·Vds + C4, where k2 is the slope of the second characteristic function y2 and C4 is the constant term of the second characteristic function y2.

[0144] The slope k2 in the second characteristic function y2 can be determined based on the variation law of the slope k in the first characteristic function y1 with the slopes of other gray levels. For example, the slope k between each gray level satisfies the law of equal ratio or equal arithmetic.

[0145] Similarly, the constant term C1 in the first characteristic function y1 can be determined based on the variation law of the constant terms corresponding to other gray levels, such as the constant terms between gray levels satisfying the geometric or arithmetic law. The constant term C4 in the second characteristic function y2 can be determined based on the constant term C1 in the first characteristic function y1 and the corresponding law.

[0146] Based on the first characteristic function y1, the slope k2 and constant term C4 in the second characteristic function y2 are determined, thus determining the second characteristic function y2 corresponding to the second gray level.

[0147] B2: Determine the second compensation function x1 based on the first voltage drop Vds2 corresponding to the second gray level, the initial light-emitting driving current I1, and the second characteristic function y2. The second compensation function x1 differs from the second characteristic function y2 only in its constant term, and the first voltage drop Vds2 and the initial light-emitting driving current I1 satisfy the second compensation function x1.

[0148] In this technical solution, the first voltage drop Vds2 corresponding to the second gray level is the same as the first voltage drop Vds2 corresponding to the first gray level. When the voltage drop Vds of the driving transistor Md changes in the same way, the data voltage Vdata corresponding to different gray levels is compensated and adjusted to reduce power consumption and ensure white balance.

[0149] Of course, in some other embodiments, the first voltage drop Vds2 corresponding to the first gray level may be different from the first voltage drop Vds2 corresponding to the second gray level. That is, the first power supply voltage ELVSS called by the display panel 100 in the first gray level is different from the first power supply voltage ELVSS called by the display panel in the second gray level.

[0150] The initial voltage drop Vds1 corresponding to the second gray level is the same as that corresponding to the first gray level. However, the data voltage Vdata received by the preset driving transistor Md is different at different gray levels, resulting in different initial light-emitting driving current I1 at different gray levels. At the second gray level, the light-emitting device 300 can maintain the white balance at the second gray level by receiving the initial light-emitting driving current I1 corresponding to the second gray level.

[0151] The changing trends of the light-emitting driving current I in the second characteristic function y2 and the second compensation function x1 are the same. Therefore, the slope k2 in the second characteristic function y2 is the same as the slope in the second compensation function x1. If the second compensation function x1 and the second characteristic function y2 are set to be functions of the same type, then the second compensation function x1 is set as I = k2·Vds + C5. Substituting the first voltage drop Vds2 corresponding to the second gray level and the desired initial light-emitting driving current I1 into the second compensation function x1, the constant term C5 can be determined, thus determining the second compensation function x1 that satisfies the brightness compensation requirement.

[0152] B3: Determine the compensation light-emitting driving current I3 corresponding to the second gray level based on the second compensation function x1 and the initial two-electrode voltage drop Vds1 corresponding to the second gray level;

[0153] The compensation light-emitting driving current I3 corresponding to the second gray level can ensure that when the voltage drop Vds across the driving transistor Md is adjusted from the initial voltage drop Vds1 to the first voltage drop Vds2, the light-emitting driving current I generated by the driving transistor Md can be changed from the compensation light-emitting driving current I3 to the initial light-emitting driving current I1.

[0154] On the second compensation function x1, the light-emitting driving current I corresponding to the initial two-electrode voltage drop Vds1 is the compensated light-emitting driving current I3. Substituting the initial two-electrode voltage drop Vds1 into the second compensation function x1, the compensated light-emitting driving current I3 corresponding to the second gray level can be determined.

[0155] B4: Determine the target data voltage Vdata' corresponding to the second gray level based on the compensation light-emitting driving current I3 corresponding to the second gray level.

[0156] In one embodiment of this application, determining the target data voltage Vdata' corresponding to the second gray level based on the compensation light-emitting driving current I3 corresponding to the second gray level includes:

[0157] Obtain the first function; the brightness corresponding to different gray levels and their corresponding preset light-emitting driving current satisfy the first function;

[0158] The brightness corresponding to the second gray level is determined based on the first function and the compensation light-emitting driving current I3 corresponding to the second gray level.

[0159] Based on the brightness corresponding to the second gray level, determine the target data voltage Vdata' corresponding to the second gray level.

[0160] In the second grayscale, the target data voltage Vdata' received by the driving transistor Md can generate a compensation light-emitting driving current I3 when the voltage drop Vds across the driving transistor Md is the same as the initial voltage drop Vds1.

[0161] The method for obtaining the first function Lv = C3·I, mentioned above, will not be repeated here. Optionally, the correspondence between the luminance Lv and the luminance driving current I corresponding to the first gray level and the correspondence between the luminance Lv and the luminance driving current I corresponding to the second gray level both satisfy the first function Lv = C3·I. Therefore, the first function Lv = C3·I does not need to be determined again for the second gray level.

[0162] Based on the first function Lv=C3·I and the compensation light-emitting driving current I3 corresponding to the second gray level, the luminous brightness Lv of the light-emitting device 300 when receiving the compensation light-emitting driving current I3 can be determined by substituting the compensation light-emitting driving current I3 corresponding to the second gray level into the first function Lv=C3·I.

[0163] The display panel 100 includes pre-set corresponding brightness and data voltage Vdata. The data voltage Vdata corresponding to the brightness of the second grayscale is selected as the target data voltage Vdata' for that second grayscale. Similarly, selecting the data voltage Vdata corresponding to the determined luminous intensity Lv can also serve as the target data voltage Vdata' for the second grayscale.

[0164] After the first power supply voltage ELVSS is adjusted in the display panel 100, the voltage drop Vds across the driving transistor Md changes to the first voltage drop Vds2. Then, the driving transistor Md receives the target data voltage Vdata' corresponding to the second gray level, so that the light emission brightness of the light-emitting device 300 is accurate and the white balance of the display panel 100 when it is working in the second gray level can be maintained.

[0165] In one embodiment of this application, reference continues to be made to... Figure 4 As shown, based on the second compensation function x1 and the initial voltage drop Vds1 corresponding to the second gray level, the compensated light-emitting driving current I3 corresponding to the second gray level is determined, including:

[0166] Substituting the initial two-electrode voltage drop Vds1 corresponding to the second gray level into the second compensation function x1, we obtain the compensation light-emitting driving current I3 corresponding to the second gray level.

[0167] In the initial state, the initial light-emitting driving current I1 corresponding to the initial voltage drop Vds1 of the second gray level can maintain the white balance of the light-emitting device 300. However, in the target state, after the voltage drop Vds of the driving transistor Md is adjusted to the first voltage drop Vds2, the light-emitting driving current I generated by the driving transistor Md is different from the initial light-emitting driving current I1. For example, at the second gray level, the absolute value of the light-emitting driving current I generated when the voltage drop Vds of the driving transistor Md is the first voltage drop Vds2 is less than the initial light-emitting driving current I1.

[0168] Therefore, in the second grayscale, in order to ensure that the light-emitting driving current I generated by the driving transistor Md at the first voltage drop Vds2 is equal to the initial light-emitting driving current I1, white balance is guaranteed.

[0169] The initial voltage drop Vds1 corresponding to the second gray level and the compensation light-emitting driving current I3 satisfy the second compensation function x1. According to the changing trend of the light-emitting driving current I represented by the second compensation function x1, when the voltage drop Vds of the driving transistor Md changes from the initial voltage drop Vds1 to the first voltage drop Vds2, the light-emitting driving current I generated by the driving transistor Md changes from the compensation light-emitting driving current I3 to a current value equal to the initial light-emitting driving current I1.

[0170] Substituting the initial voltage drop Vds1 corresponding to the second gray level into the second compensation function x1 corresponding to the second gray level, the compensation light-driving current I3 generated by the driving transistor Md can be determined.

[0171] In one embodiment of this application, reference continues to be made to... Figure 5 As shown, based on the first characteristic function y1, the second compensation function x1 is obtained, including:

[0172] A4: Obtain the third characteristic function y3 corresponding to the third gray level and the fourth characteristic function y4 corresponding to the fourth gray level;

[0173] A5: Determine the coefficients in the second characteristic function y2 based on the coefficients in the third characteristic function y3, the fourth characteristic function y4, and the first characteristic function y1;

[0174] Among them, the coefficients of the same terms in the first characteristic function y1, the second characteristic function y2, the third characteristic function y3, and the fourth characteristic function y4 conform to the same variation law.

[0175] The characteristic functions corresponding to the first, third, and fourth gray levels are all of the same type. The corresponding characteristic functions are then obtained for each of these gray levels. For example, using the method described above for determining the first characteristic function y1 corresponding to the first gray level, the third characteristic function y3 corresponding to the third gray level and the fourth characteristic function y4 corresponding to the fourth gray level are determined. Furthermore, based on the coefficients included in the common terms of the characteristic functions at the first, third, and fourth gray levels, the variation pattern of the common terms in the characteristic functions corresponding to different gray levels is determined. Based on the variation pattern of the common terms in the characteristic functions corresponding to each gray level determined above, the coefficients of each term in the second characteristic function y2 corresponding to the second gray level are determined, thus determining the second characteristic function.

[0176] In one embodiment of this application, the variation pattern may optionally include either an arithmetic progression or a geometric progression.

[0177] Based on the above method for obtaining the second characteristic function y2 corresponding to the second gray level, we can also obtain the characteristic functions corresponding to other gray levels besides the first characteristic function y1, the second characteristic function y2, the third characteristic function y3, and the fourth characteristic function y4.

[0178] The second characteristic function y2 corresponding to the second gray level is different from the second compensation function x1 only in the constant term. The current value that is the same as the initial light-emitting current I1 generated when the voltage drop across the driving transistor Md is the same as the voltage drop across the first voltage drop Vds2 under the second gray level is substituted into the second compensation function x1 to determine the constant term of the second compensation function x1, that is, to determine the second compensation function x1.

[0179] In one embodiment of this application, a second compensation function x1 is obtained based on the first characteristic function y1, including:

[0180] The second compensation function x1 is determined based on the first compensation function x2 corresponding to the first characteristic function y1.

[0181] As shown above, the compensation function for other gray levels can be determined based on the changing pattern of the same terms in the corresponding compensation functions when the gray levels are different. Therefore, the second compensation function x1 corresponding to the second gray level can be determined based on the changing pattern of the same terms between the first compensation function x2 and the other compensation functions.

[0182] For example, the compensation functions corresponding to the first, third, and fourth gray levels are all of the same type. Following the method described above for determining the first compensation function x2 at the first gray level, the third compensation function x3 for the third gray level and the fourth compensation function x4 for the fourth gray level are determined. Based on the coefficients included in the common terms of the first, third, and fourth compensation functions x2, the variation pattern of the common terms in each compensation function is determined for different gray levels. Optionally, the variation pattern includes either an arithmetic progression or a geometric progression. Based on the determined variation pattern of the common terms in the compensation functions corresponding to different gray levels, the coefficients of each term in the second compensation function x1 corresponding to the second gray level are determined, thus determining the second compensation function x1 corresponding to the second gray level.

[0183] The embodiments of this application simplify the method of obtaining the compensation function corresponding to each gray level, and directly determine the compensation function corresponding to other gray levels based on the variation law between each compensation function, thereby improving the efficiency of obtaining the target data voltage Vdata' corresponding to each gray level, further reducing the workload and improving work efficiency.

[0184] In one embodiment of this application, the first characteristic function y1 and the second compensation function x1 are both linear, quadratic, or cubic functions.

[0185] Figure 7 This is a schematic diagram of a driver chip provided in an embodiment of this application.

[0186] This application provides a driver chip 400, such as... Figure 7 As shown, the driver chip 400 includes a method for acquiring the target data voltage Vdata' as provided in the above embodiments.

[0187] In the driver chip 400, a method is proposed to determine the compensated target data voltage Vdata' corresponding to the second gray level based on the first characteristic function y1 corresponding to the first gray level and the second compensation function x1 corresponding to the second gray level. Setting the second compensation function x1 corresponding to the second gray level can be determined based on the first characteristic function y1 corresponding to the first gray level. This avoids the need to separately determine the corresponding characteristic function and then the compensation function for each gray level to obtain the target data voltage Vdata' required for each gray level. It also avoids the need to perform extensive testing of data such as the light-emitting driving current I and the brightness of the light-emitting device 300 to determine the target data voltage Vdata' for each gray level. This method of quickly determining the target data voltage Vdata' for each gray level based on the characteristic function and the compensation function helps reduce workload and improve work efficiency.

[0188] Furthermore, by setting the characteristic functions and compensation functions corresponding to different gray levels, the target data voltage Vdata' that enables the driving transistor Md to generate a light-emitting driving current I with brightness compensation at different gray levels is determined. This is beneficial when adjusting the voltage drop between the source S and drain D of the driving transistor Md to reduce power consumption, ensuring that the driving transistor Md receives the target data voltage Vdata' and generates a light-emitting driving current I that allows the light-emitting device 300 to emit light accurately. This helps ensure the accuracy of the light-emitting brightness of the light-emitting device 300. White balance is an indicator in the display panel 100 representing the accuracy of white generated by mixing the light emitted by the red, green, and blue light-emitting devices. In the display panel 100, if the accuracy of the light-emitting brightness of a certain color light-emitting device 300 cannot be guaranteed at a certain gray level, the white balance of the display panel 100 at that gray level will be affected accordingly, impacting the display effect of the display panel 100. Therefore, this method also helps to maintain white balance at different gray levels, improving the display effect of the display panel 100.

[0189] This application provides a display panel 100, which is driven by the driver chip 400 provided in the above embodiment.

[0190] In the display panel 100, a method is proposed to determine the compensated target data voltage Vdata' corresponding to the second gray level based on the first characteristic function y1 corresponding to the first gray level and the second compensation function x1 corresponding to the second gray level. Setting the second compensation function x1 corresponding to the second gray level can be determined based on the first characteristic function y1 corresponding to the first gray level. This avoids the need to separately determine the corresponding characteristic function and then the compensation function for each gray level to obtain the target data voltage Vdata' required for each gray level, and avoids the need to perform extensive testing of data such as the light-emitting driving current I and the brightness of the light-emitting device 300 to determine the target data voltage Vdata' for each gray level. This method of quickly determining the target data voltage Vdata' for each gray level based on the characteristic function and the compensation function helps reduce workload and improve work efficiency.

[0191] Furthermore, by setting the characteristic functions and compensation functions corresponding to different gray levels, the target data voltage Vdata' that enables the driving transistor Md to generate a light-emitting driving current I with brightness compensation at different gray levels is determined. This is beneficial when adjusting the voltage drop between the source S and drain D of the driving transistor Md to reduce power consumption, ensuring that the driving transistor Md receives the target data voltage Vdata' and generates a light-emitting driving current I that allows the light-emitting device 300 to emit light accurately. This helps ensure the accuracy of the light-emitting brightness of the light-emitting device 300. White balance is an indicator in the display panel 100 representing the accuracy of white generated by mixing the light emitted by the red, green, and blue light-emitting devices. In the display panel 100, if the accuracy of the light-emitting brightness of a certain color light-emitting device 300 cannot be guaranteed at a certain gray level, the white balance of the display panel 100 at that gray level will be affected accordingly, impacting the display effect of the display panel 100. Therefore, this method also helps to maintain white balance at different gray levels, improving the display effect of the display panel 100.

[0192] Figure 8 This is a schematic diagram of a display device provided in an embodiment of this application.

[0193] This application provides a display device 500, such as... Figure 8 As shown, it includes the display panel 100 as provided in the above embodiment.

[0194] In the display device 500, a method is proposed to determine the compensated target data voltage Vdata' corresponding to the second gray level based on the first characteristic function y1 corresponding to the first gray level and the second compensation function x1 corresponding to the second gray level. Setting the second compensation function x1 corresponding to the second gray level can be determined based on the first characteristic function y1 corresponding to the first gray level. This avoids the need to separately determine the corresponding characteristic function and then the compensation function for each gray level to obtain the target data voltage Vdata' required for each gray level. It also avoids the need to perform extensive testing of data such as the light-emitting driving current I and the brightness of the light-emitting device 300 to determine the target data voltage Vdata' for each gray level. This method of quickly determining the target data voltage Vdata' for each gray level based on the characteristic function and the compensation function helps reduce workload and improve work efficiency.

[0195] Furthermore, by setting the characteristic functions and compensation functions corresponding to different gray levels, the target data voltage Vdata' that enables the driving transistor Md to generate a light-emitting driving current I with brightness compensation at different gray levels is determined. This is beneficial when adjusting the voltage drop between the source S and drain D of the driving transistor Md to reduce power consumption, ensuring that the driving transistor Md receives the target data voltage Vdata' and generates a light-emitting driving current I that allows the light-emitting device 300 to emit light accurately. This helps ensure the accuracy of the light-emitting brightness of the light-emitting device 300. White balance is an indicator in the display panel 100 representing the accuracy of white generated by mixing the light emitted by the red, green, and blue light-emitting devices. In the display panel 100, if the accuracy of the light-emitting brightness of a certain color light-emitting device 300 cannot be guaranteed at a certain gray level, the white balance of the display panel 100 at that gray level will be affected accordingly, impacting the display effect of the display panel 100. Therefore, this method also helps to maintain white balance at different gray levels, improving the display effect of the display panel 100.

[0196] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for obtaining the driving voltage of a display panel, characterized in that, The display panel includes multiple pixel circuits, each pixel circuit including a driving transistor, which is used to receive data voltage and generate light-emitting driving current. The method includes: Obtain the first characteristic function corresponding to the first gray level; Based on the first characteristic function, the second compensation function corresponding to the second gray level is obtained; Based on the second compensation function, determine the target data voltage corresponding to the second gray level; The display panel also includes a light-emitting device. When the driving transistor generates a light-emitting driving current, the first terminal of the driving transistor is electrically connected to the first terminal of the light-emitting device, and one of the second terminal of the driving transistor and the second terminal of the light-emitting device receives a first power supply voltage and the other receives a second power supply voltage. The step of obtaining the first characteristic function corresponding to the first gray level includes: The first characteristic function is determined based on the initial voltage drop and initial light-emitting driving current corresponding to the first gray level in the initial state, and the first voltage drop and first light-emitting driving current corresponding to the first gray level in the target state. The first power supply voltage corresponding to the first gray level in the target state is different from the first power supply voltage corresponding to the first gray level in the initial state. The voltage drop is the voltage drop between the source and drain of the driving transistor. The variables of the first characteristic function include the voltage drop and the light-emitting driving current. The initial voltage drop is the voltage drop between the source and drain of the driving transistor in the initial state, and the first voltage drop is the voltage drop between the source and drain of the driving transistor in the target state. The first characteristic function represents the correspondence between the light-emitting driving current generated when the driving transistor operates in the saturation region at the first gray level and the voltage drop between the driving transistor. The step of obtaining the second compensation function corresponding to the second gray level based on the first characteristic function includes: The second characteristic function corresponding to the second gray level is determined based on the first characteristic function corresponding to the first gray level; the second characteristic function is expressed as the relationship between the light-emitting driving current generated when the driving transistor is working in the saturation region at the second gray level and the voltage drop across the driving transistor. The second compensation function is determined based on the first voltage drop across the two electrodes corresponding to the second gray level, the initial light-emitting driving current, and the second characteristic function; the second compensation function differs from the second characteristic function only in its constant term, and the first voltage drop across the two electrodes and the initial light-emitting driving current satisfy the second compensation function; The step of determining the target data voltage corresponding to the second gray level according to the second compensation function includes: Based on the second compensation function and the initial voltage drop across the two electrodes corresponding to the second gray level, determine the compensation light-emitting driving current corresponding to the second gray level; The target data voltage corresponding to the second gray level is determined based on the compensation light-emitting driving current corresponding to the second gray level.

2. The method according to claim 1, characterized in that, The method further includes: Based on the first characteristic function, the first compensation function is obtained, including: The first compensation function is determined based on the first voltage drop across the first electrode, the initial light-emitting driving current, and the first characteristic function; the first compensation function differs from the first characteristic function only in its constant term, and the first voltage drop across the first electrode and the initial light-emitting driving current satisfy the first compensation function; Based on the first compensation function, the target data voltage corresponding to the first gray level is determined, including: Based on the first compensation function and the initial voltage drop across the two electrodes, determine the compensation light-emitting driving current corresponding to the first gray level; The target data voltage corresponding to the first gray level is determined based on the compensation light-emitting driving current corresponding to the first gray level.

3. The method according to claim 1, characterized in that, Based on the second compensation function and the initial voltage drop across the electrodes corresponding to the second gray level, the compensated light-emitting driving current corresponding to the second gray level is determined, including: Substituting the initial voltage drop across the two electrodes corresponding to the second gray level into the second compensation function yields the compensated light-emitting driving current corresponding to the second gray level.

4. The method according to claim 1, characterized in that, The step of determining the target data voltage corresponding to the second gray level based on the compensated light-emitting driving current corresponding to the second gray level includes: Obtain the first function; the brightness corresponding to different gray levels and their corresponding preset light-emitting driving current satisfy the first function; The brightness corresponding to the second gray level is determined based on the first function and the compensation light-emitting driving current corresponding to the second gray level. The target data voltage corresponding to the second gray level is determined based on the brightness corresponding to the second gray level.

5. The method according to claim 1, characterized in that, The step of obtaining the second compensation function based on the first characteristic function includes: Obtain the third characteristic function corresponding to the third gray level and the fourth characteristic function corresponding to the fourth gray level; The coefficients in the second characteristic function are determined based on the coefficients in the third characteristic function, the fourth characteristic function, and the first characteristic function; wherein the coefficients of the same terms in the first characteristic function, the second characteristic function, the third characteristic function, and the fourth characteristic function conform to the same variation law.

6. The method according to claim 2, characterized in that, The step of obtaining the second compensation function based on the first characteristic function includes: The second compensation function is determined based on the first compensation function corresponding to the first characteristic function.

7. The method according to claim 5, characterized in that, The aforementioned pattern of change includes either an arithmetic progression or a geometric progression.

8. The method according to claim 1, characterized in that, Both the first characteristic function and the second compensation function are one of the following: linear function, quadratic function, and cubic function.

9. A driver chip, characterized in that, This includes obtaining the target data voltage using the method described in any one of claims 1-8.

10. A display panel, characterized in that, The driving chip described in claim 9 is used for driving.

11. A display device, characterized in that, Includes the display panel as described in claim 10.

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