Brightness adjusting method of display panel, display panel and display device

Abstract

The invention provides a brightness adjusting method of a display panel, the display panel and a display device, and the method comprises the steps: obtaining an initial gamma register value, a minimum change width and a current display brightness value, wherein the minimum change width is the minimum change width after an enabling level input signal of a light-emitting control signal is processed; determining a gamma register compensation value at least according to the minimum change width and the current display brightness value, and compensating the initial gamma register value by adopting the gamma register compensation value; and adopting the compensated gamma register value to adjust the brightness of the pixel so as to adjust the brightness of the display panel, so that the brightness adjustment precision of the display panel is greater than the preset precision. According to the method, the gamma register compensation value is automatically calculated, and the gamma register compensation value is compensated to the current gamma register, so that the brightness change is realized, and the purpose of improving the brightness change precision is achieved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a brightness adjustment method of a display panel, a display panel, and a display device. Background Art

[0002] AMOLED (Active-Matrix Organic Light-Emitting Diodes) is a display technology, and its full name in Chinese is active matrix organic light-emitting diodes. AMOLED technology uses organic materials as the light-emitting layer, which emit light when powered. Unlike traditional LCDs (liquid crystal displays), AMOLED does not require a backlight, and each pixel is self-luminous, which means that AMOLED displays can be made thinner and lighter, and pixels that do not need to emit light can be completely turned off when displaying black, providing deeper blacks and higher contrast.

[0003] In AMOLED technology, EM duty refers to the ratio of the luminous time of each pixel within the effective display time to the entire display cycle time. It is usually achieved by changing the luminous time of the pixel, that is, by controlling the high and low level time of the ESTV (Emission Start Timing Voltage) signal. The change of EMduty is the direct control factor of the pixel brightness change. A higher EM duty means that the pixel emits light for a longer time and the brightness is higher; conversely, the brightness is lower.

[0004] However, due to the limitation of the driving circuit of the AMOLED display panel, the variation accuracy of EM duty is less than that of DBV (display brightness value), that is, the variation of EM duty may be limited to a specific step. In the dimming area of ​​the display panel, although DBV can be changed very finely, the variation of EM duty is limited by these steps, resulting in the variation accuracy of EM duty being lower than that of DBV. When the accuracy of EM duty is insufficient, the variation of panel brightness will also be limited, especially in the low-brightness dimming area. Here, with the slight change of DBV, EM duty may not be able to make corresponding fine adjustments, but instead jumps in fixed steps. This causes the brightness to show a step-like variation pattern instead of a smooth transition, so that the brightness variation with DBV is not accurate, and in severe cases, the naked eye can perceive the brightness jump problem. Summary of the invention

[0005] The main purpose of the present application is to provide a brightness adjustment method for a display panel, a display panel and a display device, so as to at least solve the problem of low brightness variation accuracy of an AMOLED display panel during a dimming process in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for adjusting the brightness of a display panel is provided, comprising: obtaining an initial display parameter set, the initial display parameter set at least including an initial gamma register value, a minimum change width, and a current display brightness value, the minimum change width being the minimum change width after processing an enable level input signal of a light emitting control signal; determining a gamma register compensation value at least based on the minimum change width and the current display brightness value, and using the gamma register compensation value to compensate the initial gamma register value to obtain a compensated gamma register value; using the compensated gamma register value to adjust the brightness of a pixel to adjust the brightness of a display panel, so that the brightness adjustment accuracy of the display panel is greater than a preset accuracy.

[0007] According to another aspect of the present application, a display panel is provided, and the brightness of the display panel is adjusted by using any one of the brightness adjustment methods for the display panel.

[0008] According to another aspect of the present application, a display device is provided, comprising any one of the display panels described above.

[0009] Applying the technical solution of the present application, the brightness adjustment method of the above-mentioned display panel first obtains the minimum change width, the initial gamma register value and the current display brightness value after the enable level input signal of the light-emitting control signal is processed, and then determines the gamma register compensation value according to the minimum change width and the current display brightness value, and uses the gamma register compensation value to compensate the initial gamma register value; finally, the compensated gamma register value is used to adjust the brightness of the pixel to adjust the brightness of the display panel. The method automatically calculates the gamma register compensation value according to the size of the minimum change width of the light-emitting control signal, and compensates the gamma register compensation value to the current gamma register, thereby realizing the change of brightness, achieving the purpose of improving the brightness change accuracy, and solving the problem of low brightness change accuracy of AMOLED display panels during dimming in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0011] Figure 1 A schematic diagram of a curve showing Lum and EM duty changing with DBV in the prior art is shown;

[0012] Figure 2A schematic diagram of a process of adjusting brightness of a display panel provided according to an embodiment of the present application is shown;

[0013] Figure 3 A schematic structural diagram of a pixel driving circuit provided according to an embodiment of the present application is shown;

[0014] Figure 4 A schematic diagram of a DL / L and DBV brightness curve provided according to an embodiment of the present application is shown;

[0015] Figure 5 A schematic diagram showing the principle of a linear interpolation algorithm provided according to an embodiment of the present application is shown;

[0016] Figure 6 A schematic diagram showing the relationship between a gamma register reference value, a grayscale value and a DBV brightness during an experimental debugging according to an embodiment of the present application is shown;

[0017] Figure 7 A schematic diagram showing a flow chart of another method for adjusting brightness of a display panel provided according to an embodiment of the present application;

[0018] Figure 8 A schematic diagram of a curve showing the initial width of a light emitting control signal and a gamma register compensation value changing with DBV in theory according to an embodiment of the present application is shown;

[0019] Fig. 9 A comparison diagram of the brightness curve in the prior art and the brightness curve of the present application is shown;

[0020] Fig.10 A schematic diagram of a curve showing a change in a gamma register compensation value versus DBV obtained from an actual test according to an embodiment of the present application is shown;

[0021] Fig.11 A comparison diagram of the W255 DBV brightness curve in the prior art and the W255 DBV brightness curve of the present application is shown;

[0022] Fig.12 A comparison diagram of another W255 DBV brightness curve in the prior art and the W255 DBV brightness curve of the present application is shown;

[0023] Fig.13 A comparison diagram of the W63 DBV brightness curve in the prior art and the W255 DBV brightness curve of the present application is shown;

[0024] Fig.14 A comparison diagram of another prior art W63 DBV brightness curve and the present application W255 DBV brightness curve is shown;

[0025] Fig.15 A schematic diagram of the structure of a display panel provided according to an embodiment of the present application is shown;

[0026] Fig.16 A schematic structural diagram of a display device provided according to an embodiment of the present application is shown.

[0027] The above drawings include the following reference numerals:

[0028] 300. Display panel; 400. Display device. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising 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.

[0032] As introduced in the background technology, in the prior art, due to the limitation of panel driving, the EM duty variation accuracy is smaller than the DBV variation accuracy, such as Figure 1As shown, Lum is the abbreviation of Luminance, with the unit of nit, which is the brightness value read out by the optical device. DBV is the display brightness value, which is the parameter used by the whole machine to control the actual brightness. DBV has no unit, only a digital quantity, and the general value range is between 0 and 4095. EM duty refers to the ratio of the luminous time of each pixel within the effective display time to the entire display cycle time, in percentage. a is the change curve of Lum with DBV, and b is the change curve of EM Duty with DBV. In the dimming area of ​​the display panel, EM Duty changes with DBV in a step-like manner, and the brightness Lum also changes with DBV in a step-like manner. In this way, the accuracy of brightness changing with DBV is not high, and in severe cases, the naked eye can perceive the brightness jump problem.

[0033] Due to the panel drive limitation (EM 1 drives 2), EM duty changes only once every 4 lines. Taking a resolution of 2400 lines as an example, the EM duty change steps do not exceed 600, and the total DBV change steps are 4096 (the actual corresponding EM dimming steps are about 1000 or more). Therefore, the EM duty change accuracy is smaller than the DBV change accuracy, and similar DBV Gamma values ​​are similar, so the brightness will also change in steps.

[0034] In some examples, take the resolution of 1080X2400, VBP=16H, VFP=32H as an example, as shown in Table 1, EM Duty=EM_Low / Vtotal, EM_Low=Vtotal-EM_High, Vtotal=Vactive+VBP+VFP, that is, Vtotal=2400+16+32=2448, when EM dimming starts, DBV=490, EM_Low=2448-2244=204, EM Duty=204 / 2448=8.33%, when EM dimming ends, DBV=1674, EM_Low=2448-60=2388, EM Duty=2388 / 2448=97.55%, thus, the DBV changes by 1184 steps in the EM dimming interval, and the EM Duty changes by only 546 steps, so the EM duty change accuracy is less than the DBV change accuracy, which is close to DBV. The gamma values ​​are similar, so the brightness will also change in steps.

[0035] Table 1

[0036] Point DBV EM Duty(%) EM_High(H) EM dimming starts 490 8.33％ 2244 EM dimming ends 1674 97.55％ 60 Change Step 1184 546 546

[0037] In order to solve the problem of low brightness variation accuracy of AMOLED display panels during dimming in the prior art, embodiments of the present application provide a brightness adjustment method for a display panel, a display panel, and a display device.

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] It should be noted that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from that shown here.

[0040] In this embodiment, a method for adjusting the brightness of a display panel is provided. Figure 2 FIG. 1 is a flow chart of a method for adjusting the brightness of a display panel according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0041] Step S101, obtaining an initial display parameter set, the initial display parameter set at least including an initial gamma register value, a minimum change width, and a current display brightness value, the minimum change width being the minimum change width after the enable level input signal of the light emitting control signal is processed;

[0042] Specifically, the pixel driving circuit is as follows: Figure 3 As shown, the pixel driving circuit is composed of a first light emission control transistor M1, a data writing transistor M2, a driving transistor M3, a threshold elimination transistor M4, an initialization transistor M5, a second light emission control transistor M6, and a reset transistor M7. The light emission control signal is an Emit signal input to the gate of the first light emission control transistor M1 and the gate of the second light emission control transistor M6. When the gate of the first light emission control transistor M1 and the gate of the second light emission control transistor M6 of the circuit are both P-type TFTs, the enable level is a low level (controlling the light emitting element to emit light), and when the gate of the first light emission control transistor M1 and the gate of the second light emission control transistor M6 of the circuit are both N-type TFTs, the enable level is a high level (controlling the light emitting element to emit light). Figure 3 2 shows a case where the gate of the first light emission control transistor M1 and the second light emission control transistor M6 are both P-type TFTs.

[0043] The initial display parameter set is obtained, including the following steps:

[0044] Step S1011, obtaining a current display brightness value, a current grayscale value, and a current screen refresh frame rate, and determining an initial gamma register value according to the current display brightness value, the current grayscale value, and the current screen refresh frame rate;

[0045] Among them, determining the initial gamma register value according to the current display brightness value, the current grayscale value and the current screen refresh frame rate includes the following steps:

[0046] Step S10111, obtaining a gamma register mapping table, where the gamma register mapping table represents a mapping relationship between a gamma register value, a display brightness value, a grayscale value, and a screen refresh frame rate;

[0047] Step S10112, determining an initial gamma register value according to the current display brightness value, the current grayscale value, the current screen refresh frame rate and the gamma register mapping table.

[0048] Specifically, different screen refresh frame rates, display brightness values, and grayscale values ​​correspond to different gamma register values, respectively. According to the current display brightness value and the current grayscale value, the corresponding initial gamma register value is searched in the gamma register mapping table.

[0049] Step S1012, obtaining the luminous time ratio, and determining the minimum variation width according to the luminous time ratio, wherein the luminous time ratio is the ratio of the luminous time of the pixel to the total time within a predetermined frame time;

[0050] The minimum variation width is the same as the driving period of the light emitting control signal.

[0051] Specifically, the minimum change width is related to the design of the pixel driving circuit, that is, the minimum change width is equivalent to the driving period of the light emitting control signal. If the driving period of the light emitting control signal is 2 lines, then EM_step=2H (H represents the number of lines); if the driving period of the light emitting control signal is 4 lines, EM_step=4H. Under normal circumstances, the driving period of the light emitting control signal is 4 lines.

[0052] Step S1013: determine the set of the initial gamma register value, the minimum change width and the current display brightness value as the initial display parameter set.

[0053] Specifically, the Gamma value is a nonlinear relationship that describes how the display converts the input voltage or current signal into the output brightness. The Gamma register value stores the currently set Gamma curve data. The initial Gamma register value refers to the basic Gamma value used to establish the conversion between brightness and input signal when the system starts or in a specific display mode. In AMOLED brightness control, the minimum change width usually refers to the minimum adjustable amplitude after the enable level input signal of the luminous control signal (such as the EM signal, i.e., the Emission Control signal) is processed. This determines the fineness of the brightness adjustment, that is, the minimum brightness change that the system can make. In the EM dimming mode, this parameter affects the smoothness of the brightness when the driving voltage (DBV) changes. The current display brightness value is the brightness level that the display is currently actually outputting. It is determined by the current Gamma register value, the input signal, and other related parameters.

[0054] Among them, obtaining the initial display parameter set means setting a set of parameters to initialize the display system when the system starts or when a specific display condition begins, ensuring that the brightness adjustment can start from a known and controllable starting point, thereby achieving precise control of the brightness, avoiding brightness jumps or unnatural changes in the display, and improving the comfort and display quality of the user's viewing experience. By accurately controlling these parameters, especially in areas with low brightness adjustment accuracy (such as the EM dimming area), the performance of the entire display panel can be optimized.

[0055] Step S102, determining a gamma register compensation value at least according to the minimum change width and the current display brightness value, and using the gamma register compensation value to compensate the initial gamma register value to obtain a compensated gamma register value;

[0056] Specifically, the gamma register compensation value is automatically calculated according to the minimum change width and compensated to the current gamma register, thereby realizing the change of brightness and achieving the purpose of improving the accuracy of brightness change.

[0057] Wherein, determining the gamma register compensation value at least according to the minimum change width and the current display brightness value comprises the following steps:

[0058] Step S1021, when the current display brightness value is greater than or equal to the preset brightness value, determining the gamma register compensation value to be 0;

[0059] Step S1022: when the current display brightness value is less than the preset brightness value, determine the gamma register compensation value at least according to the minimum change width and the current display brightness value.

[0060] Specifically, the preset brightness value is set according to the actual situation, and is generally set at the DBV position where the gamma register function is about to fail. According to the DBV and brightness relationship curve, the following is obtained: Figure 4 The DL / L and DBV brightness curve shown in the figure; DL is the brightness difference between adjacent DBVs, L is the current DBV brightness value, according to Figure 4 The DL / L and DBV brightness curves in the display are used to determine the setting of the preset brightness value. In addition, the preset brightness value can be adjusted according to the characteristics of the screen or according to the upper limit of the DL / L specification.

[0061] Determining the gamma register compensation value based on at least the minimum change width and the current display brightness value also includes the following steps:

[0062] Step S201, determining a remainder value according to the minimum change width and the current display brightness value, where the remainder value represents the difference between the light emitting control signal and the driving capability of the display panel;

[0063] The method of determining the remainder value according to the minimum change width and the current display brightness value includes the following steps:

[0064] Step S301, according to the current display brightness value, the initial width of the light control signal is calculated by linear interpolation, and the initial width of the light control signal is the minimum step length that can be changed when the light control signal is not processed;

[0065] According to the current display brightness value, the initial width of the light emitting control signal is obtained by linear interpolation calculation, including the following steps:

[0066] Step S401, obtaining a first DBV node and a second DBV node;

[0067] Step S402, determining a first initial width of a light emitting control signal corresponding to the first DBV node according to the first DBV node, and determining a second initial width of a light emitting control signal corresponding to the second DBV node according to the second DBV node;

[0068] Step S403 , obtaining the initial width of the light emitting control signal by linear interpolation calculation according to the first DBV node, the second DBV node, the first initial width, the second initial width and the current display brightness value.

[0069] Specifically, the DBV node refers to a specific point when the driving voltage changes. The first DBV node and the second DBV node can be understood as two known points on the brightness adjustment curve, which correspond to different driving voltage levels and corresponding brightness outputs. These nodes are used as reference points in the algorithm design of brightness adjustment. The first DBV node and the second DBV node are two pre-set nodes, and the first initial width and the second initial width are the initial widths of the light-emitting control signal corresponding to the first DBV node and the second DBV node, which are predetermined. These widths refer to the duration of the low level or enable level of the light-emitting control signal (EM signal) at the driving voltage level corresponding to the first and second DBV nodes. This width directly affects the brightness of the pixel because the width of the EM signal determines the light-emitting time of the pixel.

[0070] The current display brightness value is the brightness level of the display before brightness adjustment. It is located somewhere between the first DBV node and the second DBV node. Through such calculation, the brightness of the AMOLED can be controlled more finely, especially in areas with low DBV change accuracy, such as the EM dimming area, which helps to improve the smoothness and accuracy of brightness changes, thereby improving the overall display quality.

[0071] Among them, Figure 5As shown, according to the first DBV node, the second DBV node, the first initial width, the second initial width and the current display brightness value, the initial width of the light emitting control signal is obtained by linear interpolation calculation, including the following steps:

[0072] Step S4031, obtain the linear interpolation calculation formula Among them, EM_Low_I is the initial width of the light control signal, DBV n is the first DBV node, DBV n-1 For the second DBV node, EM_Low_I n is the first initial width, EM_Low_I n-1 is the second initial width, DBV_I n The current display brightness value is input;

[0073] Step S4032, determining the initial width of the light emitting control signal according to a linear interpolation calculation formula.

[0074] Specifically, linear interpolation is a mathematical method used to insert the value of a new point between two known points. The schematic diagram of the linear interpolation algorithm is as follows Figure 5 As shown. Given the first DBV node and the first initial width, as well as the second DBV node and the second initial width, the initial width of the light control signal can be calculated based on the current display brightness value. The calculation process involves determining the position of the current brightness value relative to the two nodes, and then linearly calculating the signal width that should be set based on their width values.

[0075] Step S302, obtaining a difference offset value, where the difference offset value is a difference offset value between a light emitting control signal and a light emitting output signal, wherein the light emitting control signal is used to control the light emitting time of a pixel, and the light emitting output signal is a signal representing the actual light emitting time of the pixel;

[0076] Wherein, obtaining the difference offset value includes the following steps:

[0077] Step S3021, obtaining a correction offset formula EM_out = (EM_Low_I + EM_low_Offset) % EM_step × EM_step, wherein EM_out is the light output signal, EM_Low_I is the initial width of the light control signal, EM_Low_Offset is the difference offset value, and EM_step is the minimum change width;

[0078] Step S3022: Determine the difference offset value according to the correction offset formula.

[0079] Specifically, EM_out is the total number of rows of the enable level output of the light-emitting control signal of the display panel within 1 frame time. The light-emitting control signal is a signal used by the system to control the light-emitting time of the pixel. In AMOLED, each pixel has an independent transistor to control its current, thereby controlling the light-emitting intensity and time. The light-emitting control signal is usually generated by the display driver chip to accurately control the turn-on time of each pixel to achieve the desired brightness level.

[0080] The luminous output signal is a signal that actually measures or characterizes the actual luminous time of the pixel. Due to factors such as the physical characteristics of the display system, process deviations, temperature changes, aging effects, etc., the ideal effect of the luminous control signal may not be completely consistent with the actual effect. The luminous output signal provides information about the actual luminous time of the pixel, which may be obtained through built-in sensors, feedback circuits, or post-processing data.

[0081] The difference offset value refers to the difference between the light-emitting control signal and the light-emitting output signal, specifically the deviation in time control between the two. For example, if the light-emitting control signal indicates that the pixel should emit light for 10 milliseconds, but due to various factors, the actual light-emitting time may be 9.5 milliseconds or 10.5 milliseconds. This difference may accumulate over a long period of time, resulting in inaccurate display brightness. The purpose of obtaining the difference offset value is to correct this signal deviation, thereby improving the control accuracy of the pixel light-emitting time.

[0082] Step S303, determining a remainder value according to the minimum change width, the initial width of the light emitting control signal and the difference offset value.

[0083] Specifically, the remainder value is determined to compensate for the inaccurate brightness adjustment caused by the above-mentioned minimum change width and difference offset value. Specifically, the remainder value calculation may involve mathematical operations between the initial width of the light-emitting control signal, the minimum change width, and the difference offset value. The purpose is to fine-tune the width of the light-emitting control signal during brightness adjustment so that the light-emitting time can more accurately match the expectation, reduce the step effect in the brightness change, and improve the smoothness and accuracy of the brightness change.

[0084] The method of determining the remainder value according to the minimum change width, the initial width of the light emitting control signal and the difference offset value comprises the following steps:

[0085] Step S3031, obtaining a remainder calculation formula Remainder=(EM_Low_I+EM_Low_Offset)%EM_step, wherein Remainder is the remainder value, EM_Low_I is the initial width of the light emitting control signal, EM_Low_Offset is the difference offset value, and EM_step is the minimum change width;

[0086] Step S3032, determine the remainder value according to the remainder calculation formula.

[0087] Specifically, first, based on the initial width and minimum change width of the light-emitting control signal, the remainder of the width change of the light-emitting control signal is calculated, that is, the part that cannot be completely divided by the minimum change width. Then, combined with the difference offset value, this remainder is appropriately adjusted to compensate for the deviation between the actual light-emitting time and the theoretical value. Finally, the adjusted remainder value is applied to the width adjustment algorithm of the light-emitting control signal to achieve fine-tuning during each brightness adjustment, thereby improving the accuracy and quality of the overall brightness adjustment. In this way, the system can more accurately control the light-emitting time of each pixel, thereby achieving more delicate and natural brightness changes.

[0088] Step S202, obtaining a current grayscale value, and determining a gamma register reference value according to the current grayscale value and the current display brightness value;

[0089] Wherein, determining the gamma register reference value according to the current grayscale value and the current display brightness value includes the following steps:

[0090] Step S501, determining an initial reference value of a gamma register according to a current grayscale value and a current display brightness value;

[0091] Wherein, determining the initial reference value of the gamma register according to the current grayscale value and the current display brightness value includes the following steps:

[0092] Step S5011, obtaining a two-dimensional lookup table, wherein the two-dimensional lookup table represents a mapping relationship between grayscale values, display brightness values, and gamma initial reference values;

[0093] Step S5012, determining an initial reference value of a gamma register according to the current grayscale value, the current display brightness value and a two-dimensional lookup table.

[0094] Specifically, the two-dimensional lookup table is a two-dimensional lookup table of the relationship between the gamma register value, the display brightness value, and the grayscale value, that is, the input display brightness value and the grayscale value can find the corresponding gamma register value. The structure of the gamma register mapping table is shown in Table 2, where Gray is the grayscale value, DBV is the display brightness value, Gamma2Ref is the gamma register value, and Node0...Node7 are the corresponding pixel points.

[0095] Table 2

[0096]

[0097]

[0098] Among them, the gamma register mapping table is obtained through experimental debugging based on a large amount of actual screen data. The specific relationship curve during debugging is as follows: Figure 6 As shown. Figure 6 The debugging experiment in the debugging results shows that the gamma register mapping table with data stored in it is shown in Table 3:

[0099] Table 3

[0100]

[0101]

[0102] Step S502, obtaining a frequency correction value, where the frequency correction value is used to correct the difference between gamma register reference values ​​corresponding to different screen refresh frame rates;

[0103] Wherein, obtaining the frequency correction value includes the following steps:

[0104] Step S5021, obtain the correction value acquisition formula Among them, Fr_Gain is the frequency correction value, Gamma2Ref _非基础频率 Gamma2Ref is the initial reference value of the gamma register corresponding to the screen refresh frame rate when it is not the base frequency. _基础频率 The initial reference value of the gamma register corresponding to the screen refresh frame rate as the base frequency;

[0105] Step S5022, determining the frequency correction value according to the correction value acquisition formula.

[0106] Specifically, in the display system, different screen refresh frame rates may affect the display effect, especially the accuracy of brightness and color. For example, a higher refresh rate may lead to a decrease in system response time, affecting the accuracy of gamma correction. The frequency correction value is used to correct the difference in gamma register reference values ​​between different screen refresh frame rates. Different frequencies can obtain the corresponding gamma register reference values ​​through program debugging.

[0107] Step S503: Use the frequency correction value to correct the initial reference value of the gamma register to obtain a gamma register reference value.

[0108] Specifically, the current screen refresh frame rate is first determined, and a frequency correction value is calculated based on the frequency. Then, the initial reference value of the gamma register is adjusted using this frequency correction value. Through such correction, the display system can maintain consistent image quality at different frequencies, avoiding brightness or color distortion caused by frequency changes.

[0109] The frequency correction value is used to correct the initial reference value of the gamma register to obtain the gamma register reference value, including the following steps:

[0110] Step S5031, obtaining a correction formula Gamma2Ref'=Fr_Gain×Gamma2Ref, wherein Gamma2Ref' is a gamma register reference value, Fr_Gain is a frequency correction value, and Gamma2Ref is an initial reference value of the register;

[0111] Step S5032, correcting the initial reference value of the gamma register according to the correction formula to obtain a reference value of the gamma register.

[0112] Specifically, the gamma register reference value is the gamma correction value adjusted by the frequency correction value, which is used to guide the display system on how to perform gamma correction at the current operating frequency to obtain the best brightness and color performance. This reference value more accurately reflects the correction requirements of the system at a specific frequency.

[0113] Step S203, determining the gamma register compensation value according to the remainder value, the minimum change width and the gamma register reference value.

[0114] Specifically, this is to improve the accuracy of brightness adjustment and reduce the brightness discontinuity or "step" effect caused by the discreteness of signal changes. Based on the above steps, the display system can control the brightness change more accurately and avoid the brightness jump that can be perceived by the naked eye, thereby improving the image quality and user viewing experience. This method is particularly suitable for scenes that require high-precision brightness adjustment, such as low-brightness display or EM dimming area, to ensure smooth and accurate brightness changes at all brightness levels.

[0115] The gamma register compensation value is determined according to the remainder value, the minimum change width and the gamma register reference value, including the following steps:

[0116] Step S2031, determining the gamma register correction coefficient according to the remainder value and the minimum change width;

[0117] The gamma register correction coefficient is determined according to the remainder value and the minimum change width, including: determining the ratio of the remainder value and the minimum change width as the gamma register correction coefficient.

[0118] Specifically, this is to achieve higher precision and smoothness during brightness adjustment.

[0119] In the process of brightness adjustment of the display system, especially when the EM (Emission) dimming method is used, the change of EM Duty (i.e., the duty cycle of the EM signal) is limited by the panel driving circuit, resulting in inconsistent step lengths of brightness adjustment. Especially in low brightness adjustment, the "step effect" may be generated due to the limitation of the minimum change step length, that is, the brightness change is discontinuous, and the naked eye can perceive sudden brightness jumps. The residual value quantifies the amount of the small difference between the ideal change and the actual change. It reflects the remaining part of the EM signal width change under the current brightness adjustment setting, that is, this part of the change does not reach the minimum step length that can cause a significant change in brightness.

[0120] The minimum change width is the minimum EM signal change amplitude that the display controller can recognize and respond to, which is determined by the physical characteristics of the display panel and the design of the drive circuit. If this width is large, the accuracy of brightness adjustment will be affected because the system cannot respond to signal changes smaller than this width. This is particularly obvious when adjusting low brightness, because smaller brightness changes may fall within this "dead zone" and cannot be accurately recognized and responded to by the system.

[0121] The ratio of the remainder value to the minimum change width is used as the gamma register correction coefficient to modify the gamma correction mechanism to compensate for the lack of precision in brightness adjustment. By using this correction coefficient, the system can fine-tune the gamma register value. Even if the change in the EM signal is not enough to cause a significant change in brightness, the dynamic adjustment of the gamma correction can convert this slight change into a slight change in brightness, thereby improving the accuracy of brightness adjustment.

[0122] Step S2032, determining the gamma register compensation value according to the gamma register correction coefficient and the gamma register reference value.

[0123] Specifically, the display system can more accurately control the brightness of each pixel, and even when the signal change is limited by the minimum change step, the Gamma correction mechanism can be used to compensate for it, thereby improving the accuracy of brightness control and the smoothness of image display. This is crucial for application scenarios that require high-precision brightness adjustment, such as low-brightness display or EM dimming areas, because it can significantly reduce the discontinuity or "step" effect in brightness changes, providing a more natural and comfortable viewing experience.

[0124] The step of determining the gamma register compensation value according to the gamma register correction coefficient and the gamma register reference value includes: determining the gamma register compensation value as the product of the gamma register correction coefficient and the gamma register reference value.

[0125] Specifically, during the EM dimming process, the change in brightness is achieved by adjusting the high-level duration of the EM signal (i.e., the duty cycle). However, due to the limitations of the drive circuit, the change of the EM signal can usually only be performed with a certain minimum step size, which may lead to the appearance of a step effect in brightness control. The step effect refers to the discontinuous change in brightness, and the naked eye can perceive the sudden jump in brightness, especially when adjusting at low brightness.

[0126] In order to reduce the staircase effect and improve the smoothness and accuracy of brightness changes, the Gamma register correction coefficient is introduced. This coefficient is calculated based on the remainder value of the signal change (that is, the part of the signal change that cannot be divided by the minimum step length) and the minimum change width of the system. It reflects the lack of signal change accuracy in brightness control and quantifies the degree of compensation required through Gamma correction.

[0127] Step S103, using the compensated gamma register value to adjust the brightness of the pixel to adjust the brightness of the display panel, so that the brightness adjustment accuracy of the display panel is greater than a preset accuracy.

[0128] Specifically, by adjusting the value of the Gamma register based on the compensation value calculated based on the correction coefficient and the reference value, the step effect of brightness change during EM dimming can be compensated, making the brightness change smoother and more continuous. This is crucial for application scenarios that require high-precision brightness control (such as low-brightness display or fine brightness adjustment) because it ensures that the displayed image maintains good visual effects at all brightness levels and avoids sudden or unnatural changes in brightness.

[0129] The gamma register compensation value is used to compensate the initial gamma register value to obtain the compensated gamma register value, including: determining the sum of the initial gamma register value and the gamma register compensation value as the compensated gamma register value.

[0130] Specifically, gamma correction is a process used in display systems to adjust the nonlinear relationship between input signals and output brightness, with the goal of making images more natural and consistent with human perception at different brightness and grayscale levels. The gamma register value is a parameter used to achieve this correction, which directly affects the voltage or current of the pixels on the display panel, and thus affects the brightness.

[0131] The initial gamma register value refers to the gamma correction parameter automatically determined by the display system based on the currently set grayscale value and brightness level when there is no additional brightness adjustment or compensation. This value reflects the gamma correction effect under standard conditions and is the basis for the normal operation of the display system.

[0132] In some display technologies, such as EM dimming (Emission Modulation), brightness adjustment is limited by the minimum change step size. This means that when the signal change of the brightness change does not reach the minimum step size, the actual brightness may not change, or the change will show a step effect, that is, the brightness change is not smooth, and the human eye may perceive a sudden jump in brightness. To solve this problem, the Gamma register compensation value is introduced, which is calculated based on the remainder of the signal change and the minimum change width of the system. The role of the compensation value is to fine-tune the Gamma register value to compensate for the brightness control error caused by insufficient signal change accuracy.

[0133] The compensated gamma register value can be obtained by adding the initial gamma register value to the gamma register compensation value. The purpose of this operation is to combine the original gamma correction effect with the additional compensation effect to make up for the lack of brightness change accuracy during EM dimming. The compensated value means that the display system will adjust the brightness according to more accurate gamma correction parameters, thereby achieving smoother and more accurate brightness changes, reducing the step effect, and improving display quality.

[0134] By adjusting the compensated gamma register value, the display system can control the brightness of each pixel more accurately. Even when the brightness change signal is limited, dynamic fine-tuning of gamma correction can be used to achieve higher-precision brightness adjustment and smoother brightness gradients, ensuring the consistency and naturalness of image display effects and enhancing the user's visual experience.

[0135] The display panel includes a plurality of pixel driving circuits, and the brightness of the pixels is adjusted using the compensated gamma register value, and further includes the following steps:

[0136] Step S601, determining a data write signal at least according to the compensated gamma register value;

[0137] Wherein, determining the data write signal at least according to the compensated gamma register value comprises the following steps:

[0138] Step S6011, obtaining a data signal calculation formula VData=Func(Data_Output, Vgamma), wherein VData is a data write signal, Data_Output is a compensated gamma register value, and Vgamma is a gamma register reference value;

[0139] Step S6012, determining a data write signal according to a data signal calculation formula.

[0140] Specifically, the data write signal is Figure 3The Vdata signal in the display panel. In the display panel, the data write signal is responsible for transferring the image data from the external data driver to the driving circuit of each pixel. These image data contain the grayscale information that each pixel needs to display, which determines the brightness and color of each pixel. The precise control of the data write signal is the basis for ensuring that the pixel circuit receives the correct data, which in turn affects the final display effect. Therefore, according to the compensated gamma register value, determining the data write signal can directly adjust the brightness of the pixel.

[0141] In an uncompensated system, due to the step effect of the EM signal change, the brightness may change discontinuously, which is particularly obvious when displaying at low brightness, and may cause the user to feel a sudden jump in brightness. By using the compensated Gamma register value, this discontinuity can be reduced, making the brightness change more continuous and improving the visual quality of the display effect.

[0142] The human eye's perception of brightness changes is not always linear, especially in low-brightness conditions, where small brightness changes may be perceived as larger changes. The compensated Gamma register value can better optimize the brightness consistency perceived by the human eye by fine-tuning the Gamma correction curve, ensuring smooth brightness changes that conform to the visual characteristics of the human eye even in low-brightness or EM dimming areas.

[0143] The compensated Gamma register value allows the system to dynamically adjust the brightness dynamic range of the display panel to adapt to different environments and display content. This adjustment ensures that the display panel can provide the best visual experience at all brightness levels, whether it is clarity under high brightness conditions or softness under low brightness conditions.

[0144] Step S602, inputting a data write signal to a data write signal terminal of a pixel driving circuit to adjust the brightness of the pixel, and the pixel driving circuit is used to drive the pixel to emit light or not emit light.

[0145] Specifically, the data write signal is a specific signal generated by the display driver circuit, which is responsible for transmitting data containing grayscale information and brightness adjustment instructions to the driver circuit of each pixel. In a display panel, especially an AMOLED panel, each pixel has its own driver circuit that can independently control the brightness and color of the pixel.

[0146] The pixel drive circuit is a key component in the display panel. After receiving the data write signal, it controls the light-emitting state of the pixel according to the grayscale value and brightness adjustment instruction in the signal. Specifically: the data write signal contains the grayscale value that each pixel should display, which determines the brightness level of the pixel's light. The higher the grayscale value, the higher the brightness of the pixel. In addition to the grayscale information, the data write signal may also contain brightness adjustment instructions, which are used to adjust the brightness of the pixel without changing the grayscale value. This brightness adjustment is usually achieved through dimming technology (such as EM dimming), which can adjust the brightness of the entire display panel or certain areas without changing the image content.

[0147] When the data write signal is input to the data write signal terminal of the pixel driving circuit, it first stores the grayscale information in the capacitor or storage unit in the pixel circuit. Then, according to the grayscale information and possible brightness adjustment instructions, the transistor (such as TFT) in the pixel driving circuit will control the current flowing through the pixel. The current directly determines the brightness of the AMOLED pixel.

[0148] In EM dimming technology, the data write signal will indirectly affect the pixel's light-emitting time, that is, the high-level duration of the EM signal. By adjusting the characteristics of the data write signal (such as voltage, current or pulse width), the duration of the pixel's light emission in each frame period can be controlled, and then the pixel's brightness can be adjusted to achieve the purpose of overall brightness control.

[0149] Simply put, the data write signal is a bridge between the display driver circuit and the pixel driver circuit. It transmits grayscale information and brightness adjustment instructions, enabling the pixel driver circuit to control the brightness of each pixel. In AMOLED panels, this process is particularly important because the driver circuit of each pixel needs to independently control its light-emitting state to achieve high-quality image display and flexible brightness adjustment. By precisely controlling the data write signal, the display system can ensure that the pixel shows the expected brightness and color under different grayscale and brightness settings, thereby providing an excellent visual experience.

[0150] The brightness adjustment method of the display panel of the present application first obtains the minimum change width, the initial gamma register value and the current display brightness value after the enable level input signal of the light-emitting control signal is processed, and then determines the gamma register compensation value according to the minimum change width and the current display brightness value, and uses the gamma register compensation value to compensate the initial gamma register value; finally, the compensated gamma register value is used to adjust the brightness of the pixel to adjust the brightness of the display panel. The method automatically calculates the gamma register compensation value according to the size of the minimum change width of the light-emitting control signal, and compensates the gamma register compensation value to the current gamma register, thereby realizing the change of brightness, achieving the purpose of improving the brightness change accuracy, and solving the problem of low brightness change accuracy of AMOLED display panels during dimming in the prior art.

[0151] In some instances, such as Figure 7 As shown, first, the size relationship between the current display brightness value (i.e., DBV) and the preset brightness value (i.e., DBV_Th) is determined. When the current display brightness value is greater than or equal to the preset brightness value, the gamma register compensation value (i.e., Gamma2Reg) is determined to be 0, that is, the initial gamma register value (i.e., Gamma1Reg) is not compensated; when the current display brightness value is less than the preset brightness value, the current display brightness value is input into the gamma register compensation value calculation logic circuit, the gamma register compensation value is calculated, and the gamma register compensation value is used to compensate the initial gamma register value to obtain the compensated gamma register value.

[0152] Among them, Figure 7 As shown, when the current display brightness value is less than the preset brightness value, the current display brightness value (ie DBV) and Figure 3The minimum change width (EM_step) of the light emitting control signal (Emit) of the pixel circuit shown is input into the brightness control module for calculation, and the initial width of the light emitting control signal is calculated. Then, the initial width of the light emitting control signal is input into the remainder calculation module to calculate the remainder value; at the same time, the current display brightness value (ie, DBV) and the current gray value are input into the initial gamma register value confirmation module to calculate the initial reference value of the gamma register, and the initial reference value of the gamma register is corrected by the frequency correction value to obtain the gamma register reference value (Gamma2Ref). Finally, the remainder value and the gamma register reference value are input into the gamma register compensation value calculation module to calculate the gamma register compensation value (Gamma2Reg), and the initial gamma register value (ie, Gamma1Reg) is compensated by the gamma register compensation value (Gamma2Reg), and the compensated gamma register value is the sum of the gamma register compensation value and the initial gamma register value.

[0153] like Figure 8 As shown, Figure 8 d is the theoretical curve of the initial width of the light control signal (EM_Low_I) changing with DBV, and c is the theoretical curve of the gamma register compensation value changing with DBV. Figure 8 The curve in Fig. 9 The curve in .

[0154] like Fig. 9 As shown, DL is the brightness difference between adjacent DBVs (i.e., the display panel brightness bars are divided into 4096 parts, and the brightness changes every time a value changes), L is the current brightness value, Fig. 9 In the figure, e is a brightness curve in the prior art in theory without using the above method to compensate the gamma register value, and f is a brightness curve after using the above method to compensate the gamma register value in theory.

[0155] Fig.10 This is the curve of the gamma register compensation value changing with DBV obtained from actual testing. Fig.10 It can be seen that the curve obtained by actual test is Fig. 9 In theory, the curve of gamma register compensation value changing with DBV is similar.

[0156] In addition, a large number of test experiments were carried out on the above methods. The test results are as follows: Figures 11 to 14 As shown. Fig.11As shown, the g curve is the W255 DBV brightness curve after the gamma register value is compensated by the above method, and the h curve is the curve in the prior art without using the above method to compensate the gamma register value. Fig.11 It can be seen that the step change of the g curve is obviously lower than that of the h curve.

[0157] Will Fig.11 The curve in is converted to W255 DL / L curve, such as Fig.12 As shown, DL is the brightness difference of DBV between two adjacent pixels, L is the current brightness value, wherein the j curve is the W255DBV brightness curve after the gamma register value is compensated by the above method, and the i curve is the curve in the prior art that does not use the above method to compensate the gamma register value. Fig.12 It can be seen that the brightness change of the j curve is obviously smaller than that of the i curve.

[0158] like Fig.13 As shown, the k curve is the W63 DBV brightness curve after the gamma register value is compensated by the above method, and the L curve is the curve in the prior art where the gamma register value is not compensated by the above method. Fig.13 It can be seen that the step change of the k curve is obviously lower than that of the L curve.

[0159] Will Fig.13 The curve in is converted to W255 DL / L curve, such as Fig.14 As shown, DL is the brightness difference of DBV between two adjacent pixels, L is the current brightness value, wherein the n curve is the W63DBV brightness curve after the gamma register value is compensated by the above method, and the m curve is the curve in the prior art that does not use the above method to compensate the gamma register value. Fig.14 It can be seen that the brightness change of the n curve is obviously smaller than that of the m curve.

[0160] An embodiment of the present invention provides a display panel, such as Fig.15 As shown, any one of the display panel brightness adjustment methods is used to adjust the brightness of the display panel 300 .

[0161] The above-mentioned display panel of the present application uses any display panel brightness adjustment method to adjust the brightness of the display panel. According to the minimum change width of the light-emitting control signal, the gamma register compensation value is automatically calculated, and the gamma register compensation value is compensated to the current gamma register, thereby realizing the change of brightness and achieving the purpose of improving the brightness change accuracy, that is, the brightness change accuracy of the display panel is higher.

[0162] An embodiment of the present invention provides a display device, such as Fig.16 As shown, the display device 400 includes any type of display panel 300 .

[0163] The display device provided in this embodiment may be an array substrate or a terminal display device, such as a mobile phone, a computer, a television, or other display devices with display functions, and the present invention does not specifically limit this. The display device provided in the embodiment of the present invention has the beneficial effects of the gate drive circuit provided in the embodiment of the present invention, and the details can be referred to the above embodiments. The specific description of the gate drive circuit is not repeated in this embodiment.

[0164] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0165] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0166] 1) The brightness adjustment method of the display panel of the present application first obtains the minimum change width, the initial gamma register value and the current display brightness value after the enable level input signal of the light-emitting control signal is processed, and then determines the gamma register compensation value according to the minimum change width and the current display brightness value, and uses the gamma register compensation value to compensate the initial gamma register value; finally, the compensated gamma register value is used to adjust the brightness of the pixel to adjust the brightness of the display panel. The method automatically calculates the gamma register compensation value according to the size of the minimum change width of the light-emitting control signal, and compensates the gamma register compensation value to the current gamma register, thereby realizing the change of brightness, achieving the purpose of improving the brightness change accuracy, and solving the problem of low brightness change accuracy of AMOLED display panels during dimming in the prior art.

[0167] 2) The above-mentioned display panel of the present application uses any display panel brightness adjustment method to adjust the brightness of the display panel. According to the minimum change width of the light-emitting control signal, the gamma register compensation value is automatically calculated, and the gamma register compensation value is compensated to the current gamma register, thereby realizing the change of brightness and achieving the purpose of improving the brightness change accuracy, that is, the brightness change accuracy of the display panel is higher.

[0168] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for adjusting the brightness of a display panel, characterized in that: include: Acquire an initial display parameter set, the initial display parameter set at least including an initial gamma register value, a minimum change width, and a current display brightness value, the minimum change width being the minimum change width after the enable level input signal of the light emitting control signal is processed; Determine a gamma register compensation value at least according to the minimum change width and the current display brightness value, and use the gamma register compensation value to compensate the initial gamma register value to obtain a compensated gamma register value; The brightness of the pixel is adjusted by using the compensated gamma register value to adjust the brightness of the display panel, so that the brightness adjustment accuracy of the display panel is greater than a preset accuracy.

2. The method according to claim 1, characterized in that Determining a gamma register compensation value at least according to the minimum change width and the current display brightness value, including: When the current display brightness value is greater than or equal to the preset brightness value, determining that the gamma register compensation value is 0; In a case where the current display brightness value is less than the preset brightness value, a gamma register compensation value is determined based at least on the minimum change width and the current display brightness value.

3. The method according to claim 1, characterized in that Determining a gamma register compensation value at least according to the minimum change width and the current display brightness value, including: Determining a remainder value according to the minimum variation width and the current display brightness value, wherein the remainder value represents a difference between a light emitting control signal and a driving capability of the display panel; Obtaining a current grayscale value, and determining a gamma register reference value according to the current grayscale value and the current display brightness value; The gamma register compensation value is determined according to the remainder value, the minimum change width, and the gamma register reference value.

4. The method according to claim 3, characterized in that Determining a remainder value according to the minimum change width and the current display brightness value includes: According to the current display brightness value, an initial width of the light emitting control signal is obtained by linear interpolation calculation, wherein the initial width of the light emitting control signal is a minimum step length that can be changed when the light emitting control signal is not processed; Acquire a difference offset value, where the difference offset value is a difference offset value between a light emitting control signal and a light emitting output signal, where the light emitting control signal is used to control the light emitting time of the pixel, and the light emitting output signal is a signal representing the actual light emitting time of the pixel; The remainder value is determined according to the minimum variation width, an initial width of the light emitting control signal, and the difference offset value.

5. The method according to claim 4, characterized in that According to the current display brightness value, the initial width of the light emitting control signal is obtained by linear interpolation calculation, including: Get the first DBV node and the second DBV node; Determine a first initial width of the light emitting control signal corresponding to the first DBV node according to the first DBV node, and determine a second initial width of the light emitting control signal corresponding to the second DBV node according to the second DBV node; The initial width of the light emitting control signal is obtained by linear interpolation calculation according to the first DBV node, the second DBV node, the first initial width, the second initial width and the current display brightness value.

6. The method according to claim 5, characterized in that Obtaining the initial width of the light emitting control signal by linear interpolation calculation according to the first DBV node, the second DBV node, the first initial width, the second initial width, and the current display brightness value, comprises: Get the linear interpolation calculation formula Among them, EM_Low_I is the initial width of the light control signal, DBV n is the first DBV node, DBV n-1 For the second DBV node, EM_Low_I n is the first initial width, EM_Low_I n-1 For the second initial width, DBV_I n The current display brightness value input; According to the linear interpolation calculation formula, the initial width of the light emitting control signal is determined.

7. The method according to claim 4, characterized in that Get the difference offset value, including: Obtain the correction offset formula EM_out_=(EM_Low_I+EM_low_Offset)%EM_step×EM_step, wherein EM_out is the light output signal, EM_Low_I is the initial width of the light control signal, EM_Low_Offset is the difference offset value, and EM_step is the minimum change width; The difference offset value is determined according to the correction offset formula.

8. The method according to claim 4, characterized in that Determining the remainder value according to the minimum change width, the initial width of the light emitting control signal and the difference offset value includes: Obtain a remainder calculation formula of Remainder=(EM_Low_I+EM_Low_Offset)%EM_step, wherein Remainder is the remainder value, EM_Low_I is the initial width of the light emitting control signal, EM_Low_Offset is the difference offset value, and EM_step is the minimum change width; The remainder value is determined according to the remainder calculation formula.

9. The method according to claim 3, characterized in that: Determining a gamma register reference value according to the current grayscale value and the current display brightness value includes: Determining an initial reference value of a gamma register according to the current grayscale value and the current display brightness value; Obtaining a frequency correction value, wherein the frequency correction value is used to correct the difference between the gamma register reference values ​​corresponding to different screen refresh frame rates; The frequency correction value is used to correct the initial reference value of the gamma register to obtain the gamma register reference value.

10. The method according to claim 9, characterized in that Determining an initial reference value of a gamma register according to the current grayscale value and the current display brightness value includes: Obtaining a two-dimensional lookup table, wherein the two-dimensional lookup table represents a mapping relationship between grayscale values, display brightness values, and gamma initial reference values; The gamma register initial reference value is determined according to the current grayscale value, the current display brightness value and the two-dimensional lookup table.

11. The method according to claim 9, characterized in that Get frequency correction value, including: Get the correction value to get the formula Among them, Fr_Gain is the frequency correction value, Gamma2Ref_ 非基础频率 Gamma2Ref_ is the initial reference value of the gamma register corresponding to the screen refresh frame rate when the screen refresh frame rate is not the basic frequency, 基础频率 The initial reference value of the gamma register corresponding to the screen refresh frame rate as the basic frequency; The frequency correction value is determined according to the correction value acquisition formula.

12. The method according to claim 9, characterized in that The frequency correction value is used to correct the initial reference value of the gamma register to obtain the reference value of the gamma register, including: Obtain a correction formula Gamma2Ref'=Fr_Gain×Gamma2Ref, wherein Gamma2Ref' is the gamma register reference value, Fr_Gain is the frequency correction value, and Gamma2Ref is the register initial reference value; The initial reference value of the gamma register is corrected according to the correction formula to obtain the gamma register reference value.

13. The method according to claim 3, characterized in that Determining the gamma register compensation value according to the remainder value, the minimum change width, and the gamma register reference value includes: Determining a gamma register correction coefficient according to the remainder value and the minimum change width; The gamma register compensation value is determined according to the gamma register correction coefficient and the gamma register reference value.

14. The method according to claim 13, characterized in that Determining a gamma register correction coefficient according to the remainder value and the minimum change width includes: The ratio of the remainder value to the minimum change width is determined as the gamma register correction coefficient.

15. The method according to claim 13, characterized in that Determining the gamma register compensation value according to the gamma register correction coefficient and the gamma register reference value includes: The gamma register compensation value is determined according to the product of the gamma register correction coefficient and the gamma register reference value.

16. The method according to claim 1, characterized in that The initial gamma register value is compensated by using the gamma register compensation value to obtain a compensated gamma register value, including: The sum of the initial gamma register value and the gamma register compensation value is determined as the compensated gamma register value.

17. The method according to claim 1, characterized in that The display panel includes a plurality of pixel driving circuits, and the brightness of the pixels is adjusted using the compensated gamma register value, including: determining a data write signal at least according to the compensated gamma register value; The data write signal is input to the data write signal terminal of the pixel driving circuit to adjust the brightness of the pixel, and the pixel driving circuit is used to drive the pixel to emit light or not emit light.

18. The method according to claim 17, characterized in that Determining a data write signal at least according to the compensated gamma register value, comprising: Obtain a data signal calculation formula VData=Func(Data_Output, Vgamma), wherein VData is the data write signal, Data_Output is the compensated gamma register value, and Vgamma is the gamma register reference value; The data writing signal is determined according to the data signal calculation formula.

19. The method according to any one of claims 1 to 18, characterized in that Get the initial display parameter set, including: Obtaining the current display brightness value, the current grayscale value, and the current screen refresh frame rate, and determining the initial gamma register value according to the current display brightness value, the current grayscale value, and the current screen refresh frame rate; Acquire a luminous time ratio, and determine the minimum variation width according to the luminous time ratio, wherein the luminous time ratio is the ratio of the luminous time of the pixel to the total time within a predetermined frame time; A set of the initial gamma register value, the minimum change width, and the current display brightness value is determined as the initial display parameter set.

20. The method according to claim 19, characterized in that Determining the initial gamma register value according to the current display brightness value, the current grayscale value, and the current screen refresh frame rate includes: Obtain a gamma register mapping table, wherein the gamma register mapping table represents a mapping relationship between a gamma register value, a display brightness value, a grayscale value, and a screen refresh frame rate; The initial gamma register value is determined according to the current display brightness value, the current grayscale value, the current screen refresh frame rate and the gamma register mapping table.

21. The method according to claim 19, characterized in that The minimum variation width is the same as a driving period of the light emitting control signal.

22. A display panel, characterized in that: The brightness of the display panel is adjusted by using the brightness adjustment method of the display panel described in any one of claims 1 to 21.

23. A display device, characterized in that: Includes the display panel as claimed in claim 22.

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