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

Abstract

This application provides a brightness adjustment method for a display panel, a display panel, and a display device. The method includes: acquiring an initial gamma register value, a minimum variation width, and a current display brightness value, wherein the minimum variation width is the minimum variation width after processing the enable level input signal of the light emission control signal; determining a gamma register compensation value based at least on the minimum variation width and the current display brightness value, and compensating the initial gamma register value with the gamma register compensation value; adjusting the brightness of the pixels using the compensated gamma register value to adjust the brightness of the display panel, such that the brightness adjustment accuracy of the display panel is greater than a preset accuracy. This method automatically calculates the gamma register compensation value and applies it to the current gamma register, thereby achieving brightness variation and improving the accuracy of brightness variation.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a method for adjusting the brightness of a display panel, a display panel, and a display device. Background Technology

[0002] AMOLED (Active-Matrix Organic Light-Emitting Diodes) is a display technology. AMOLED technology uses organic materials as the light-emitting layer, which emit light when electricity is applied. Unlike traditional LCDs (Liquid Crystal Displays), AMOLEDs do not require a backlight; each pixel is self-emissive. This means that AMOLED displays can be made thinner and lighter, and can completely turn off pixels that do not need to emit light when displaying black, thus providing deeper blacks and higher contrast.

[0003] In AMOLED technology, EM duty refers to the ratio of the light-emitting time of each pixel within the effective display time to the entire display cycle time. It is typically adjusted by changing the pixel's light-emitting time, specifically by controlling the high and low levels of the ESTV (Emission Start Timing Voltage) signal. Changes in EM duty are a direct control factor for pixel brightness; a higher EM duty means a longer pixel light-emitting time and higher brightness, while a lower EM duty results in lower brightness.

[0004] However, due to limitations in the driving circuitry of AMOLED display panels, the precision of EM duty changes is lower than that of DBV (brightness value) changes. In other words, EM duty changes may be restricted to specific steps. In the dimming area of ​​the display panel, although DBV can change very finely, EM duty changes are limited by these steps, resulting in lower precision for EM duty changes compared to DBV changes. When EM duty precision is insufficient, panel brightness changes are also limited, especially in low-brightness dimming areas. Here, with subtle changes in DBV, EM duty may not be able to make corresponding fine adjustments, instead changing in fixed steps. This causes the brightness to exhibit a stepped change pattern rather than a smooth transition, resulting in low precision in brightness changes with DBV. In severe cases, the human eye may perceive abrupt brightness jumps. Summary of the Invention

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

[0006] To achieve the above objectives, according to one aspect of this application, a method for adjusting the brightness of a display panel is provided, comprising: acquiring an initial display parameter set, the initial display parameter set including at least an initial gamma register value, a minimum variation width, and a current display brightness value, wherein the minimum variation width is the minimum variation width after processing of the enable level input signal of a light emission control signal; determining a gamma register compensation value based at least on the minimum variation width and the current display brightness value, and compensating the initial gamma register value with the gamma register compensation value to obtain a compensated gamma register value; and adjusting the brightness of pixels using the compensated gamma register value to adjust the brightness of the display panel, such that the brightness adjustment accuracy of the display panel is greater than a preset accuracy.

[0007] According to another aspect of this application, a display panel is provided, wherein the brightness of the display panel is adjusted using any of the brightness adjustment methods described herein.

[0008] According to another aspect of this application, a display device is provided, comprising any of the aforementioned display panels.

[0009] Applying the technical solution of this application, the brightness adjustment method for the aforementioned display panel first obtains the minimum variation width of the enable level input signal of the light emission control signal, the initial gamma register value, and the current display brightness value. Then, based on the minimum variation width and the current display brightness value, a gamma register compensation value is determined, and the initial gamma register value is compensated using this compensation value. Finally, the brightness of the pixels is adjusted using the compensated gamma register value to adjust the brightness of the display panel. This method automatically calculates the gamma register compensation value based on the minimum variation width of the light emission control signal and applies it to the current gamma register, thereby achieving brightness variation and improving the accuracy of brightness variation. This solves the problem of low brightness variation accuracy in the dimming process of AMOLED display panels in the prior art. Attached Figure Description

[0010] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

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

[0012] Figure 2A schematic flowchart of a brightness adjustment method for a display panel according to an embodiment of this application is shown.

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

[0014] Figure 4 A schematic diagram of a DL / L vs. DBV luminance curve provided according to an embodiment of this application is shown;

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

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

[0017] Figure 7 A schematic flowchart of another brightness adjustment method for a display panel according to an embodiment of this application is shown;

[0018] Figure 8 A schematic diagram showing the curves of the initial width of the theoretically emitted light control signal versus the gamma register compensation value as a function of DBV, according to an embodiment of this application;

[0019] Figure 9 A comparison diagram is shown between the brightness curve in the prior art and the brightness curve of this application;

[0020] Figure 10 A schematic diagram of the variation curve of the gamma register compensation value as a function of DBV obtained from actual testing according to an embodiment of this application is shown.

[0021] Figure 11 A comparison diagram is shown between the W255 DBV brightness curve in the prior art and the W255 DBV brightness curve of this application;

[0022] Figure 12 A comparison diagram is shown between the W255 DBV brightness curve of another prior art and the W255 DBV brightness curve of this application;

[0023] Figure 13 A comparison diagram is shown between the W63 DBV luminance curve in the prior art and the W255 DBV luminance curve of this application;

[0024] Figure 14 A comparison diagram is shown between the W63 DBV brightness curve of another prior art and the W255 DBV brightness curve of this application;

[0025] Figure 15 A schematic diagram of the structure of a display panel according to an embodiment of this application is shown;

[0026] Figure 16 A schematic diagram of the structure of a display device provided according to an embodiment of this application is shown.

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

[0028] 300. Display panel; 400. Display device. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort 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, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] As described in the background section, existing technologies are limited by panel driving, resulting in lower EM duty change accuracy than DBV change accuracy. Figure 1As shown, Lum is short for Luminance, measured in nits, and represents the brightness value read from the optical device. DBV is the display brightness value, a parameter used to control the actual brightness of the entire device. DBV has no unit; it is only a digital quantity, typically ranging from 0 to 4095. EM Duty refers to the ratio of the light-emitting time of each pixel within the effective display time to the entire display cycle time, measured as a percentage. Figure a shows the curve of Lum changing with DBV, and figure b shows the curve of EM Duty changing with DBV. In the dimming area of ​​the display panel, EM Duty changes with DBV in a step-like manner, and similarly, the brightness Lum also changes with DBV in a step-like manner. This results in low precision in brightness variation with DBV, and in severe cases, the naked eye can perceive abrupt brightness changes.

[0033] Due to panel driver limitations (EM 1 driving 2), EM Duty changes only occur once every 4 rows. Taking a resolution of 2400 rows as an example, the number of EM Duty change steps does not exceed 600, and the total number of DBV change steps is 4096 (the actual corresponding EM dimming steps are more than 1000). Therefore, the accuracy of EM Duty change is less than that of DBV change. Since the DBV Gamma values ​​are similar, the brightness will also change in steps.

[0034] In some examples, taking a resolution of 1080x2400, VBP=16H, and VFP=32H as examples, 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. At the beginning of EM dimming, DBV = 490, EM_Low = 2448 - 2244 = 204, EM Duty = 204 / 2448 = 8.33%. At the end of EM dimming, DBV = 1674, EM_Low = 2448 - 60 = 2388, EM Duty = 2388 / 2448 = 97.55%. Therefore, DBV changes by 1184 steps during the EM dimming interval, while EM Duty only changes by 546 steps. Thus, the accuracy of EM duty change is less than that of DBV change. With similar gamma values, the brightness will also change in steps.

[0035] Table 1

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

[0037] To address the issue of low brightness adjustment accuracy in AMOLED display panels during dimming in existing technologies, embodiments of this application provide a brightness adjustment method for a display panel, a display panel, and a display device.

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

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

[0040] This embodiment provides a method for adjusting the brightness of a display panel. Figure 2 This is a flowchart of a brightness adjustment method for a display panel according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0041] Step S101: Obtain the initial display parameter set. The initial display parameter set includes at least the initial gamma register value, the minimum change width, and the current display brightness value. The minimum change width is the minimum change width after processing the enable level input signal of the light emission control signal.

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

[0043] Obtaining the initial display parameter set includes the following steps:

[0044] Step S1011: Obtain the current display brightness value, current grayscale value and current screen refresh rate, and determine the initial gamma register value based on the current display brightness value, current grayscale value and current screen refresh rate;

[0045] The process of determining the initial gamma register value based on the current display brightness, current grayscale value, and current screen refresh rate includes the following steps:

[0046] Step S10111: Obtain the gamma register mapping table. The gamma register mapping table represents the mapping relationship between gamma register value, display brightness value, grayscale value and screen refresh rate.

[0047] Step S10112: Determine the initial gamma register value based on the current display brightness value, current grayscale value, current screen refresh rate, and gamma register mapping table.

[0048] Specifically, different screen refresh rates, display brightness values, and grayscale values ​​correspond to different gamma register values. Based on the current display brightness value and the current grayscale value, the corresponding initial gamma register value is looked up in the gamma register mapping table.

[0049] Step S1012: Obtain the emission time ratio and determine the minimum change width based on the emission time ratio. The emission time ratio is the ratio of the emission time of a 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 emission control signal.

[0051] Specifically, the minimum variation width is related to the design of the pixel driving circuit. That is, the minimum variation width is equivalent to the driving cycle of the light emission control signal. If the driving cycle of the light emission control signal is 2 rows, then EM_step = 2H (H represents the number of rows); if the driving cycle of the light emission control signal is 4 rows, then EM_step = 4H. In general, the driving cycle of the light emission control signal is 4 rows.

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

[0053] Specifically, the Gamma value describes the non-linear relationship between how a display converts an input voltage or current signal into 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 the input signal when the system starts up or in a specific display mode. In AMOLED brightness control, the minimum variation width typically refers to the minimum adjustable amplitude after processing the enable level input signal of the emission control signal (such as the EM signal, i.e., the Emission Control signal). This determines the fineness of brightness adjustment, i.e., the minimum brightness change the system can make. In EM dimming mode, this parameter affects the smoothness of brightness changes with driving voltage (DBV). The current display brightness value is the actual brightness level currently output by the display. It is determined by the current Gamma register value, the input signal, and other relevant parameters.

[0054] Obtaining the initial display parameter set means setting a set of parameters to initialize the display system at system startup or when specific display conditions begin. This ensures that brightness adjustment starts from a known and controllable starting point, thereby achieving precise brightness control, avoiding brightness jumps or unnatural changes in the display, and improving user viewing comfort and display quality. By precisely controlling these parameters, especially in areas with low brightness adjustment precision (such as EM dimming areas), the performance of the entire display panel can be optimized.

[0055] Step S102: Determine the gamma register compensation value based at least on 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 the compensated gamma register value;

[0056] Specifically, the compensation value of the gamma register is automatically calculated based on the minimum change width and added to the current gamma register to achieve the change in brightness and improve the accuracy of brightness change.

[0057] The determination of the gamma register compensation value, based at least on the minimum variation width and the current display brightness value, includes the following steps:

[0058] Step S1021: If the current display brightness value is greater than or equal to the preset brightness value, determine that the gamma register compensation value is 0;

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

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

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

[0062] Step S201: Determine the remainder value based on the minimum change width and the current display brightness value. The remainder value represents the difference between the light emission control signal and the driving capability of the display panel.

[0063] The process of determining the remainder value based on the minimum width change and the current display brightness value includes the following steps:

[0064] Step S301: Based on the current display brightness value, the initial width of the light emission control signal is calculated using linear interpolation. The initial width of the light emission control signal is the minimum step size that the light emission control signal can change without processing.

[0065] The initial width of the light emission control signal is calculated using linear interpolation based on the current display brightness value, including the following steps:

[0066] Step S401: Obtain the first DBV node and the second DBV node;

[0067] Step S402: Determine the first initial width of the light emission control signal corresponding to the first DBV node based on the first DBV node, and determine the second initial width of the light emission control signal corresponding to the second DBV node based on the second DBV node;

[0068] Step S403: Based on 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 emission control signal is calculated using linear interpolation.

[0069] Specifically, a DBV node refers to a specific point at which 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, corresponding to different driving voltage levels and corresponding brightness outputs. These nodes serve as reference points in the brightness adjustment algorithm design. The first DBV node and the second DBV node are two pre-set nodes. The first initial width and the second initial width are pre-determined initial widths of the emission control signals corresponding to the first and second DBV nodes. These widths refer to the duration of the low level or enable level of the emission control signal (EM signal) at the driving voltage levels corresponding to the first and second DBV nodes. This width directly affects the pixel brightness because the width of the EM signal determines the pixel's emission time.

[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 calculations, the brightness of AMOLED can be controlled more precisely, especially in areas with low DBV change precision, such as the EM dimming area. This helps to improve the smoothness and accuracy of brightness changes, thereby improving the overall display quality.

[0071] Among them, such as Figure 5As shown, the initial width of the light emission control signal is calculated using linear interpolation based on the first DBV node, the second DBV node, the first initial width, the second initial width, and the current display brightness value. This includes the following steps:

[0072] Step S4031: Obtain the linear interpolation calculation formula Where EM_Low_I is the initial width of the light emission control signal, and DBV n The first DBV node, DBV n-1 For the second DBV node, EM_Low_I n EM_Low_I is the first initial width. n-1 DBV_I is the second initial width. n Enter the current display brightness value;

[0073] Step S4032: Determine the initial width of the light emission control signal according to the 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. A schematic diagram of the linear interpolation algorithm is shown below. 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 emission 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 extrapolating the signal width that should be set based on their width values.

[0075] Step S302: Obtain the difference offset value. The difference offset value is the difference offset value between the light emission control signal and the light emission output signal. The light emission control signal is used to control the light emission time of the pixel, and the light emission output signal is a signal that represents the actual light emission time of the pixel.

[0076] Obtaining the difference offset value includes the following steps:

[0077] Step S3021: Obtain the correction offset formula EM_out=(EM_Low_I+EM_low_Offset)%EM_step×EM_step, where 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 represents the total number of lines of the display panel's luminance control signal enable level output within one frame. The luminance control signal is the signal used by the system to control the timing of pixel emission. In AMOLED, each pixel has an independent transistor controlling its current, thereby controlling the intensity and duration of emission. The luminance control signal is typically generated by the display driver chip to precisely control the on-time of each pixel to achieve the desired brightness level.

[0080] The emission output signal is the signal that actually measures or characterizes the real emission time of a pixel. Due to factors such as the physical characteristics of the display system, process deviations, temperature changes, and aging effects, the ideal effect of the emission control signal may not be completely consistent with the actual effect. The emission output signal provides information about the actual emission 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 discrepancy between the emission control signal and the emission output signal, specifically the deviation in timing control. For example, if the emission control signal indicates that a pixel should emit light for 10 milliseconds, the actual emission time may be 9.5 milliseconds or 10.5 milliseconds due to various factors. This difference can accumulate over time, leading to inaccurate display brightness. The purpose of obtaining the difference offset value is to correct this signal deviation, thereby improving the control accuracy of pixel emission timing.

[0082] Step S303: Determine the remainder value based on the minimum change width, the initial width of the light emission control signal, and the difference offset value.

[0083] Specifically, the determination of the remainder value is to compensate for the inaccurate brightness adjustment caused by the minimum variation width and the difference offset value mentioned above. In detail, the remainder value calculation may involve mathematical operations between the initial width, minimum variation width, and difference offset value of the emission control signal. The purpose is to fine-tune the width of the emission control signal during brightness adjustment, thereby allowing the emission time to more accurately match expectations, reducing the step effect in brightness changes, and improving the smoothness and accuracy of brightness changes.

[0084] The process of determining the remainder value based on the minimum variation width, the initial width of the light emission control signal, and the difference offset value includes the following steps:

[0085] Step S3031: Obtain the remainder calculation formula Remainder=(EM_Low_I+EM_Low_Offset)%EM_step, where Remainder is the remainder value, EM_Low_I is the initial width of the light emission 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, firstly, based on the initial width and minimum change width of the emission control signal, the remainder of the width change of the emission control signal is calculated—that is, the portion 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 emission time and the theoretical value. Finally, the adjusted remainder value is applied to the width adjustment algorithm of the emission control signal, enabling fine-tuning during each brightness adjustment, thereby improving the overall accuracy and quality of brightness adjustment. In this way, the system can more precisely control the emission time of each pixel, thus achieving more delicate and natural brightness changes.

[0088] Step S202: Obtain the current grayscale value, and determine the gamma register reference value based on the current grayscale value and the current display brightness value;

[0089] The process of determining the gamma register reference value based on the current grayscale value and the current display brightness value includes the following steps:

[0090] Step S501: Determine the initial reference value of the gamma register based on the current grayscale value and the current display brightness value;

[0091] The process of determining the initial reference value of the gamma register based on the current grayscale value and the current display brightness value includes the following steps:

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

[0093] Step S5012: Determine the initial reference value of the gamma register based on the current grayscale value, the current display brightness value, and the 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, by inputting the display brightness value and the grayscale value, the corresponding gamma register value can be found. The structure of the gamma register mapping table is shown in Table 2. In Table 2, Gray is the grayscale value, DBV is the display brightness value, Gamma2Ref is the gamma register value, and Node0...Node7 are the corresponding pixels.

[0095] Table 2

[0096]

[0097]

[0098] The gamma register mapping table was obtained through experimental debugging based on a large amount of actual screen data. The specific relationship curves during debugging are shown in the figure below. Figure 6 As shown. According to Figure 6 The debugging experiment yielded the final gamma register mapping table containing the data, as shown in Table 3.

[0099] Table 3

[0100]

[0101]

[0102] Step S502: Obtain the frequency correction value. The frequency correction value is used to correct the difference between the gamma register reference values ​​corresponding to different screen refresh rates.

[0103] Obtaining the frequency correction value includes the following steps:

[0104] Step S5021, Obtain the formula for obtaining the correction value. Where Fr_Gain is the frequency correction value, and Gamma2Ref _非基础频率 Gamma2Ref is the initial reference value for the gamma register when the screen refresh rate is not the base frequency. _基础频率 The initial reference value of the gamma register corresponding to the screen refresh rate as the base frequency;

[0105] Step S5022: Determine the frequency correction value based on the formula for obtaining the correction value.

[0106] Specifically, in display systems, different screen refresh rates can affect display quality, 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. Frequency correction values ​​are used to correct for differences in gamma register reference values ​​between different screen refresh rates; different frequencies can be debugged using a program to obtain the corresponding gamma register reference values.

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

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

[0109] The process of correcting the initial reference value of the gamma register using a frequency correction value to obtain the gamma register reference value includes the following steps:

[0110] Step S5031: Obtain the correction formula Gamma2Ref'=Fr_Gain×Gamma2Ref, where Gamma2Ref' is the reference value of the gamma register, Fr_Gain is the frequency correction value, and Gamma2Ref is the initial reference value of the register;

[0111] Step S5032: Correct the initial reference value of the gamma register according to the correction formula to obtain the gamma register reference value.

[0112] Specifically, the gamma register reference value is a gamma correction value adjusted for frequency correction. It guides the display system on how to perform gamma correction at the current operating frequency to achieve optimal brightness and color performance. This reference value more accurately reflects the system's correction requirements at a specific frequency.

[0113] Step S203: Determine the gamma register compensation value based on the remainder value, the minimum change width, and the gamma register reference value.

[0114] Specifically, this is to improve the precision of brightness adjustment and reduce brightness discontinuities or "step" effects caused by the discreteness of signal changes. Based on the above steps, the display system can more precisely control brightness changes, avoiding brightness jumps that are perceptible to the naked eye, thereby improving image quality and the user's viewing experience. This method is particularly suitable for scenarios requiring high-precision brightness adjustment, such as low-brightness displays or EM dimming areas, to ensure smooth and accurate brightness changes at all brightness levels.

[0115] The determination of the gamma register compensation value, based on the remainder value, the minimum change width, and the gamma register reference value, includes the following steps:

[0116] Step S2031: Determine the gamma register correction coefficient based on the remainder value and the minimum change width;

[0117] The process of determining the gamma register correction coefficient based on the remainder value and the minimum change width includes: determining the ratio of the remainder value to the minimum change width as the gamma register correction coefficient.

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

[0119] During brightness adjustment in a display system, especially when using EM (Emission) dimming, the change in EM Duty (i.e., the duty cycle of the EM signal) is limited by the panel driving circuit, which may lead to inconsistent brightness adjustment step sizes. Particularly at low brightness adjustment, the limitation of the minimum change step size may cause a "step effect," meaning discontinuous brightness changes that can be perceived by the naked eye as sudden brightness jumps. The residual value quantifies this minute difference between the ideal change and the actual change. It reflects the remaining portion of the EM signal width change under the current brightness adjustment setting, i.e., this portion of the change has not reached the minimum step size that can cause a significant brightness change.

[0120] The minimum change width is the smallest EM signal change amplitude that the display controller can recognize and respond to. It 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 especially noticeable at low brightness levels, as small 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 variation width is used as a correction coefficient for the gamma register. By modifying the gamma correction mechanism, insufficient precision in brightness adjustment is compensated for. Using this correction coefficient, the system can fine-tune the gamma register value. Even if changes in the EM signal are insufficient to cause significant changes in brightness, dynamic adjustment through gamma correction can transform these minute changes into minute changes in brightness, thereby improving the precision of brightness adjustment.

[0122] Step S2032: Determine the gamma register compensation value based on the gamma register correction coefficient and the gamma register reference value.

[0123] Specifically, this display system can more precisely control the brightness of each pixel. Even when signal changes are limited by the minimum step size, the Gamma correction mechanism can compensate for this, improving the accuracy of brightness control and the smoothness of image display. This is crucial for applications requiring high-precision brightness adjustment, such as low-brightness displays or EM dimming areas, as it significantly reduces discontinuities or "step" effects in brightness changes, providing a more natural and comfortable viewing experience.

[0124] Specifically, determining the gamma register compensation value based on the gamma register correction coefficient and the gamma register reference value includes: determining the gamma register compensation value by multiplying the gamma register correction coefficient and the gamma register reference value.

[0125] Specifically, in EM dimming, brightness changes are achieved by adjusting the duration (duty cycle) of the high-level EM signal. However, due to limitations in the drive circuit, EM signal changes can typically only occur in a certain minimum step size, which can lead to a step effect in brightness control. The step effect refers to discontinuous brightness changes; sudden jumps in brightness are perceptible to the naked eye, especially noticeable when adjusting to low brightness.

[0126] To reduce the step effect and improve the smoothness and accuracy of brightness changes, a Gamma register correction coefficient is introduced. This coefficient is calculated based on the remainder of the signal change (i.e., the portion of the signal change that cannot be divided by the minimum step size) and the minimum change width of the system. It reflects the inadequacy of signal change accuracy in brightness control and quantifies the degree to which compensation through Gamma correction is needed.

[0127] In step S103, the brightness of the pixels is adjusted 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 the preset accuracy.

[0128] Specifically, by adjusting the value of the Gamma register based on the compensation value calculated using the correction coefficient and the reference value, the step effect of brightness changes during EM dimming can be compensated, making brightness changes smoother and more continuous. This is crucial for applications requiring high-precision brightness control (such as low-brightness displays or fine-tuning brightness), as it ensures that the displayed image maintains good visual quality at all brightness levels, avoiding abrupt or unnatural changes in brightness.

[0129] Specifically, the initial gamma register value is compensated using the gamma register compensation value to obtain the compensated gamma register value. This includes: 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 non-linear relationship between the input signal and the output brightness. Its purpose is to make the image appear more natural and consistent with human visual perception at different brightness and grayscale levels. The gamma register value is a parameter used to achieve this correction; it directly affects the voltage or current of the pixels on the display panel, thus affecting 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 no additional brightness adjustment or compensation is performed. This value reflects the gamma correction effect under standard conditions and is fundamental to the normal operation of the display system.

[0132] In some display technologies, such as Emission Modulation (EM), brightness adjustment is limited by a minimum step size. This means that if the signal change for brightness does not reach the minimum step size, the actual brightness may not change, or the change may exhibit a step effect, meaning the brightness change is not smooth, and the human eye may perceive sudden jumps in brightness. To address this issue, a Gamma register compensation value is introduced, calculated based on the remainder of the signal change and the system's minimum change width. The compensation value's function is to fine-tune the Gamma register value to compensate for brightness control errors caused by insufficient precision in signal changes.

[0133] Adding the initial gamma register value to the compensated gamma register value yields the compensated gamma register value. This operation combines the original gamma correction effect with the additional compensation effect to compensate for the insufficient precision of brightness changes during EM dimming. The compensated value means the display system will adjust brightness according to more accurate gamma correction parameters, resulting in smoother and more precise brightness changes, reduced stair-step effects, and improved display quality.

[0134] By adjusting the compensated gamma register value, the display system can more precisely control the brightness of each pixel. Even when the brightness change signal is limited, it can achieve higher precision brightness adjustment and smoother brightness gradient through dynamic fine-tuning of gamma correction, ensuring the consistency and naturalness of image display and improving the user's visual experience.

[0135] The display panel includes multiple pixel driving circuits, which adjust the brightness of the pixels using a compensated gamma register value, and also includes the following steps:

[0136] Step S601: Determine the data write signal based at least on the compensated gamma register value;

[0137] The process of determining the data write signal, based at least on the compensated gamma register value, includes the following steps:

[0138] Step S6011: Obtain the data signal calculation formula VData=Func(Data_Output,Vgamma), where VData is the data write signal, Data_Output is the compensated gamma register value, and Vgamma is the gamma register reference value.

[0139] Step S6012: Determine the data write signal according to the data signal calculation formula.

[0140] Specifically, the data write signal is Figure 3The Vdata signal is crucial in display panels. In this context, the data write signal is responsible for transmitting image data from the external data driver to the driving circuitry of each pixel. This image data contains the grayscale information that each pixel needs to display, determining the brightness and color of each pixel's emission. Precise control of the data write signal is fundamental to ensuring that the pixel circuitry receives the correct data, thus affecting the final display effect. Therefore, based on the compensated gamma register value, the data write signal can directly adjust the pixel brightness.

[0141] In uncompensated systems, the step effect of EM signal variations can cause discontinuous brightness changes, which is particularly noticeable at low brightness levels and may result in a perceived sudden jump in brightness. By using a compensated Gamma register value, this discontinuity can be reduced, making brightness changes more continuous and improving the visual quality of the display.

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

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

[0144] Step S602: Input the data write signal to the data write signal terminal of the pixel driving circuit to adjust the brightness of the pixel. 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. It is responsible for transmitting data containing grayscale information and brightness adjustment instructions to the driver circuit of each pixel. In display panels, especially AMOLED panels, each pixel has its own driver circuit, which can independently control the brightness and color of that pixel.

[0146] The pixel driving circuit is a key component in a display panel. Upon receiving a data write signal, it controls the pixel's illumination state based on the grayscale value and brightness adjustment instructions within the signal. Specifically, the data write signal contains the grayscale value that each pixel should display, which determines the pixel's brightness level. The higher the grayscale value, the brighter the pixel. In addition to grayscale information, the data write signal may also contain brightness adjustment instructions to adjust the pixel's brightness without changing the grayscale value. This brightness adjustment is typically achieved through dimming techniques (such as EM dimming), allowing adjustment of the brightness of the entire display panel or specific areas without altering the image content.

[0147] When a data write signal is input to the data write signal terminal of the pixel driving circuit, it first stores grayscale information in the capacitors or memory cells in the pixel circuit. Then, based on the grayscale information and possible brightness adjustment instructions, the transistors (such as TFTs) in the pixel driving circuit control the current flowing through the pixel, and the magnitude of the current directly determines the luminous brightness of the AMOLED pixel.

[0148] In EM dimming technology, the data write signal indirectly affects the emission time of the pixel, that is, the duration of the high level of the EM signal. By adjusting the characteristics of the data write signal (such as voltage, current, or pulse width), the duration of pixel emission in each frame cycle can be controlled, thereby adjusting the pixel brightness and achieving the purpose of overall brightness control.

[0149] In simple terms, the data write signal acts as a bridge between the display driver circuit and the pixel driver circuit. It transmits grayscale information and brightness adjustment commands, enabling the pixel driver circuit to control the brightness of each pixel. This process is particularly important in AMOLED panels because the driver circuit for each pixel needs to independently control its light emission state to achieve high-quality image display and flexible brightness adjustment. By precisely controlling the data write signal, the display system can ensure that pixels exhibit the expected brightness and color under different grayscale and brightness settings, thus providing an excellent visual experience.

[0150] The brightness adjustment method for the display panel described in this application first obtains the minimum variation width of the enable level input signal of the light emission control signal, the initial gamma register value, and the current display brightness value. Then, based on the minimum variation width and the current display brightness value, a gamma register compensation value is determined, and the initial gamma register value is compensated using this compensation value. Finally, the brightness of the pixels is adjusted using the compensated gamma register value to adjust the brightness of the display panel. This method automatically calculates the gamma register compensation value based on the minimum variation width of the light emission control signal and applies it to the current gamma register, thereby achieving brightness variation and improving the accuracy of brightness variation. This solves the problem of low brightness variation accuracy in existing AMOLED display panels during dimming.

[0151] In some instances, such as Figure 7 As shown, the relationship between the current display brightness value (DBV) and the preset brightness value (DBV_Th) is first determined. If the current display brightness value is greater than or equal to the preset brightness value, the gamma register compensation value (Gamma2Reg) is set to 0, meaning that no compensation is performed on the initial gamma register value (Gamma1Reg). If 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 to calculate the gamma register compensation value. The gamma register compensation value is then used to compensate the initial gamma register value to obtain the compensated gamma register value.

[0152] Among them, such as Figure 7 As shown, when the current display brightness value is less than the preset brightness value, the current display brightness value (i.e., DBV) and... Figure 3The minimum variation width (EM_step) of the emission control signal (Emit) of the pixel circuit shown is input to the brightness control module for calculation to obtain the initial width of the emission control signal. Then, the initial width of the emission control signal is input to the remainder calculation module to obtain the remainder value. Simultaneously, the current display brightness value (DBV) and the current grayscale value are input to the initial gamma register value confirmation module to calculate the initial reference value of the gamma register. This initial reference value is then corrected using a frequency correction value to obtain the gamma register reference value (Gamma2Ref). Finally, the remainder value and the gamma register reference value are input to the gamma register compensation value calculation module to calculate the gamma register compensation value (Gamma2Reg). This compensation value (Gamma2Reg) is then used to compensate for the initial gamma register value (Gamma1Reg), resulting in the compensated gamma register value being the sum of the compensation value and the initial gamma register value.

[0153] like Figure 8 As shown, Figure 8 In the diagram, d represents the theoretical curve of the initial width (EM_Low_I) of the light emission control signal changing with DBV, and c represents the theoretical curve of the gamma register compensation value changing with DBV. According to... Figure 8 The curve in the middle can be obtained Figure 9 The curve in the image.

[0154] like Figure 9 As shown, DL represents the brightness difference between adjacent DBV values ​​(i.e., the brightness change for each value change in the display panel's brightness bar, which is divided into 4096 parts), and L represents the current brightness value. Figure 9 In the figure, e represents the brightness curve that theoretically does not use the above method to compensate for the gamma register value in the existing technology, and f represents the brightness curve that theoretically uses the above method to compensate for the gamma register value.

[0155] Figure 10 The curve showing the change of the gamma register compensation value as a function of DBV obtained from actual testing. Figure 10 The curve obtained from the actual test can be seen as... Figure 9 In theory, the curves of the gamma register compensation value changing with DBV are similar.

[0156] In addition, a large number of test experiments were conducted on the above methods, and the test results are as follows: Figures 11 to 14 As shown. Figure 11As shown, the g-curve is the W255 DBV brightness curve after compensating the gamma register value using the above method, and the h-curve is the curve in the prior art that does not use the above method to compensate the gamma register value. Figure 11 It can be seen that the step change of the g curve is significantly less pronounced than that of the h curve.

[0157] Will Figure 11 Convert the curve in the image to a W255 DL / L curve, such as... Figure 12 As shown, DL represents the brightness difference of the DBV of two adjacent pixels, L represents the current brightness value, where curve j is the W255DBV brightness curve after compensating the gamma register value using the above method, and curve i is the curve in the prior art that does not use the above method to compensate the gamma register value. Figure 12 It can be seen that the brightness change of curve j is significantly smaller than that of curve i.

[0158] like Figure 13 As shown, curve k is the W63 DBV brightness curve after compensating the gamma register value using the above method, and curve L is the curve in the prior art that does not use the above method to compensate the gamma register value. Figure 13 It can be seen that the step change of the k curve is significantly less than that of the L curve.

[0159] Will Figure 13 Convert the curve in the image to a W255 DL / L curve, such as... Figure 14 As shown, DL represents the brightness difference of the DBV of two adjacent pixels, L is the current brightness value, where the n curve is the W63DBV brightness curve after compensating the gamma register value using 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. Figure 14 It can be seen that the brightness change of the n-curve is significantly smaller than that of the m-curve.

[0160] This invention provides a display panel, such as... Figure 15 As shown, the brightness of the display panel 300 can be adjusted using any of the display panel brightness adjustment methods.

[0161] The display panel described in this application adjusts its brightness using any brightness adjustment method. Based on the minimum variation width of the light emission control signal, a gamma register compensation value is automatically calculated and added to the current gamma register, thereby achieving brightness variation and improving the accuracy of brightness variation. In other words, this display panel has higher brightness variation accuracy.

[0162] This invention provides a display device, such as... Figure 16 As shown, the display device 400 includes any type of display panel 300.

[0163] The display device provided in this embodiment can be an array substrate or a terminal display device, such as a mobile phone, computer, television, or other display devices with display functions. This invention does not impose specific limitations on this. The display device provided in this embodiment has the beneficial effects of the gate driving circuit provided in this embodiment, and specific details can be found in the above embodiments. The specific description of the gate driving circuit will not be repeated here.

[0164] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0165] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0166] 1) The brightness adjustment method for the display panel described in this application first obtains the minimum variation width of the enable level input signal of the light emission control signal, the initial gamma register value, and the current display brightness value. Then, based on the minimum variation width and the current display brightness value, a gamma register compensation value is determined, and the initial gamma register value is compensated using this compensation value. Finally, the brightness of the pixels is adjusted using the compensated gamma register value to adjust the brightness of the display panel. This method automatically calculates the gamma register compensation value based on the minimum variation width of the light emission control signal and applies the compensation value to the current gamma register, thereby achieving brightness variation and improving the accuracy of brightness variation. This solves the problem of low brightness variation accuracy in AMOLED display panels during dimming in the prior art.

[0167] 2) The display panel described in this application adjusts its brightness using any brightness adjustment method. Based on the minimum variation width of the light emission control signal, a gamma register compensation value is automatically calculated and added to the current gamma register, thereby achieving brightness variation and improving the accuracy of brightness variation. In other words, this display panel has higher brightness variation accuracy.

[0168] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for adjusting the brightness of a display panel, characterized in that, include: Obtain an initial display parameter set, which includes at least an initial gamma register value, a minimum change width, and a current display brightness value. The minimum change width is the minimum change width after processing the enable level input signal of the light emission control signal. Based at least on the minimum change width and the current display brightness value, determine the gamma register compensation value, and use the gamma register compensation value to compensate the initial gamma register value to obtain the compensated gamma register value; The brightness of the pixels is adjusted 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 the preset accuracy. Determining a gamma register compensation value based at least on the minimum variation width and the current display brightness value includes: determining the gamma register compensation value to be 0 when the current display brightness value is greater than or equal to a preset brightness value; and determining a gamma register compensation value based at least on the minimum variation width and the current display brightness value when the current display brightness value is less than the preset brightness value. Determining the gamma register compensation value based at least on the minimum variation width and the current display brightness value includes: determining a remainder value based on the minimum variation width and the current display brightness value, the remainder value representing the difference between the light emission control signal and the driving capability of the display panel; obtaining the current grayscale value and determining a gamma register reference value based on the current grayscale value and the current display brightness value; and determining the gamma register compensation value based on the remainder value, the minimum variation width, and the gamma register reference value.

2. The method of claim 1, wherein, The remainder value is determined based on the minimum change width and the current display brightness value, including: Based on the current display brightness value, the initial width of the light emission control signal is calculated using linear interpolation. The initial width of the light emission control signal is the minimum step size that the light emission control signal can change without processing. Obtain the difference offset value, which is the difference offset value between the light emission control signal and the light emission output signal. The light emission control signal is used to control the light emission time of the pixel, and the light emission output signal is a signal that represents the actual light emission time of the pixel. The remainder value is determined based on the minimum variation width, the initial width of the light emission control signal, and the difference offset value.

3. The method according to claim 2, characterized in that, Based on the current display brightness value, the initial width of the light emission control signal is calculated using linear interpolation, including: Obtain the first DBV node and the second DBV node; The first initial width of the light emission control signal corresponding to the first DBV node is determined based on the first DBV node, and the second initial width of the light emission control signal corresponding to the second DBV node is determined based on the second DBV node; The initial width of the light emission control signal is calculated using linear interpolation based on the first DBV node, the second DBV node, the first initial width, the second initial width, and the current display brightness value.

4. The method according to claim 3, characterized in that, The initial width of the light emission control signal is calculated using linear interpolation based on the first DBV node, the second DBV node, the first initial width, the second initial width, and the current display brightness value, including: Obtain the linear interpolation calculation formula ,in, The initial width of the light emission control signal is given. This refers to the first DBV node. This is the second DBV node. The first initial width, This is the second initial width. The input is the current display brightness value; The initial width of the light emission control signal is determined according to the linear interpolation calculation formula.

5. The method according to claim 2, characterized in that, Obtain the difference offset value, including: Obtain the corrected offset formula ,in, The light output signal is the light emission signal. The initial width of the light emission control signal is given. The difference offset value, The minimum variation width; The difference offset value is determined according to the corrected offset formula.

6. The method according to claim 2, characterized in that, The remainder value is determined based on the minimum variation width, the initial width of the light emission control signal, and the difference offset value, including: Formula for obtaining the remainder ,in, The remainder value is the value mentioned above. The initial width of the light emission control signal is given. The difference offset value, The minimum variation width; The remainder value is determined according to the remainder calculation formula.

7. The method according to claim 1, characterized in that, Based on the current grayscale value and the current display brightness value, determine the gamma register reference value, including: Determine the initial reference value of the gamma register based on the current grayscale value and the current display brightness value; Obtain a frequency correction value, which is used to correct the difference between the gamma register reference values ​​corresponding to different screen refresh rates; The frequency correction value is used to correct the initial reference value of the gamma register to obtain the gamma register reference value.

8. The method according to claim 7, characterized in that, Based on the current grayscale value and the current display brightness value, determine the initial reference value of the gamma register, including: Obtain a two-dimensional lookup table, which represents the mapping relationship between grayscale values, display brightness values ​​and initial gamma reference values; The initial reference value of the gamma register is determined based on the current grayscale value, the current display brightness value, and the two-dimensional lookup table.

9. The method according to claim 7, characterized in that, Obtain the frequency correction value, including: Formula for obtaining correction values ,in, The frequency correction value is... This is the initial reference value for the gamma register when the screen refresh rate is not the base frequency. The initial reference value of the gamma register corresponding to the screen refresh rate as the base frequency; The frequency correction value is determined according to the formula for obtaining the correction value.

10. The method according to claim 7, characterized in that, The initial reference value of the gamma register is corrected using the frequency correction value to obtain the gamma register reference value, including: Obtain the corrected formula ,in, The reference value for the gamma register is... The frequency correction value is... The initial reference value for the register; The initial reference value of the gamma register is corrected according to the correction formula to obtain the reference value of the gamma register.

11. The method according to claim 1, characterized in that, The gamma register compensation value is determined based on the remainder value, the minimum change width, and the gamma register reference value, including: The gamma register correction coefficient is determined based on the remainder value and the minimum change width; The gamma register compensation value is determined based on the gamma register correction coefficient and the gamma register reference value.

12. The method according to claim 11, characterized in that, Based on the remainder value and the minimum change width, the gamma register correction coefficient is determined, including: The ratio of the remainder value to the minimum change width is determined as the gamma register correction coefficient.

13. The method according to claim 11, characterized in that, The gamma register compensation value is determined based on the gamma register correction coefficient and the gamma register reference value, including: The gamma register compensation value is determined by multiplying the gamma register correction coefficient and the gamma register reference value.

14. The method according to claim 1, characterized in that, The initial gamma register value is compensated using a 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.

15. The method according to claim 1, characterized in that, The display panel includes multiple pixel driving circuits, which adjust the brightness of the pixels using the compensated gamma register value, including: The data write signal is determined at least based on 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. The pixel driving circuit is used to drive the pixel to emit light or not emit light.

16. The method according to claim 15, characterized in that, The data write signal is determined based at least on the compensated gamma register value, including: Data signal calculation formula Wherein, VData is the data write signal. The compensated gamma register value, This is the reference value for the gamma register; The data write signal is determined according to the data signal calculation formula.

17. The method according to any one of claims 1 to 16, characterized in that, Obtain the initial display parameter set, including: The current display brightness value, current grayscale value, and current screen refresh rate are obtained, and the initial gamma register value is determined based on the current display brightness value, current grayscale value, and current screen refresh rate. Obtain the emission time ratio, and determine the minimum variation width based on the emission time ratio, wherein the emission time ratio is the ratio of the emission time of the pixel to the total time within a predetermined frame time; The 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.

18. The method according to claim 17, characterized in that, The initial gamma register value is determined based on the current display brightness value, the current grayscale value, and the current screen refresh rate, including: Obtain the gamma register mapping table, which represents the mapping relationship between gamma register value, display brightness value, grayscale value and screen refresh rate; The initial gamma register value is determined based on the current display brightness value, the current grayscale value, the current screen refresh rate, and the gamma register mapping table.

19. The method according to claim 17, characterized in that, The minimum variation width is the same as the driving period of the light emission control signal.

20. A display panel, characterized in that, The brightness of the display panel is adjusted using the brightness adjustment method of any one of claims 1 to 19.

21. A display device, characterized in that, Includes the display panel as described in claim 20.

Images