Gamma debugging method of display panel, display panel and display device

Abstract

The application provides a gamma debugging method of a display panel, a display panel and a display device. The gamma debugging method comprises the following steps: acquiring a first voltage, a second voltage and a first gamma value of the display panel, the first voltage being a theoretical common cathode voltage, the second voltage being an actual common cathode voltage, and the first gamma value being a theoretical gamma value; performing a subtraction operation on the first voltage and the second voltage to obtain a first potential difference value; acquiring a compensation coefficient according to the first potential difference value, and obtaining a second gamma value according to the compensation coefficient and the first gamma value, the second gamma value being an actual gamma value after debugging; in the debugging process, only the first gamma value needs to be compensated according to the change difference of the common cathode voltage after the common cathode voltage is debugged, so that the gamma value after debugging can be obtained, the debugging steps can be reduced, and the debugging time can be reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display devices, and particularly relates to a gamma debugging method of a display panel, the display panel and a display device. BACKGROUND

[0002] OLED (Organic Light-Emitting Diode) display devices have great application potential and broad development prospects in the display field. ELVSS (Emissive Low Voltage Swing Signal) as the common cathode of the OLED display panel, plays an important role in providing stable voltage to the OLED pixels. Since the OLED display module has strict requirements on power consumption, the voltage adjustment of the ELVSS becomes a key link for optimizing the display effect and reducing power consumption. Reasonable setting of the ELVSS value can ensure the OLED device to run in the best working state, while reducing unnecessary power consumption and prolonging the service life of the equipment.

[0003] However, the current gamma debugging of the display panel takes a long time, which affects the production line efficiency. Therefore, how to improve the debugging efficiency of the gamma debugging is a problem to be solved by those skilled in the art at present. SUMMARY

[0004] The present application aims to provide a gamma debugging method of a display panel, the display panel and a display device, and aims to solve the problem of long debugging time of the gamma debugging in the prior art.

[0005] The first aspect of the embodiments of the present application provides a gamma debugging method of a display panel, the gamma debugging method comprising:

[0006] obtaining a first voltage, a second voltage and a first gamma value of the display panel, the first voltage being a theoretical common cathode voltage, the second voltage being an actual common cathode voltage, and the first gamma value being a theoretical gamma value;

[0007] performing a subtraction operation on the first voltage and the second voltage to obtain a first potential difference value;

[0008] obtaining a compensation coefficient according to the first potential difference value, and obtaining a second gamma value according to the compensation coefficient and the first gamma value, the second gamma value being an actual gamma value after debugging.

[0009] In some embodiments of the present application, the obtaining of the first voltage, the second voltage and the first gamma value of the display panel comprises:

[0010] acquire the first voltage, and adjust a common cathode voltage of the display panel to the first voltage to obtain a first brightness of the display panel;

[0011] acquire an adjustment potential difference, and adjust the common cathode voltage of the display panel from the first voltage to the second voltage according to the adjustment potential difference to obtain a second brightness of the display panel;

[0012] obtain the first gamma value based on the first voltage, the first brightness, the second voltage, and the second brightness.

[0013] In some embodiments of the present application, obtaining the first gamma value based on the first voltage, the first brightness, the second voltage, and the second brightness comprises:

[0014] obtaining the first gamma value based on the first voltage, the first brightness, the second voltage, the second brightness, an intermediate voltage, and a third brightness; wherein the intermediate voltage is an intermediate voltage for adjusting the common cathode voltage of the display panel from the first voltage to the second voltage, and the third brightness is a brightness of the display panel when the common cathode voltage of the display panel is the intermediate voltage.

[0015] In some embodiments of the present application, acquiring the adjustment potential difference and adjusting the common cathode voltage of the display panel from the first voltage to the second voltage according to the adjustment potential difference to obtain the second brightness of the display panel comprises:

[0016] acquiring a plurality of adjustment potential differences, and adjusting the first voltage to the second voltage step by step based on the plurality of adjustment potential differences;

[0017] obtaining a plurality of third brightnesses when the common cathode voltage of the display panel is a plurality of intermediate voltages.

[0018] In some embodiments of the present application, the plurality of adjustment potential differences are the same or different, and none of the plurality of adjustment potential differences is less than a minimum adjustment step in the display panel circuit.

[0019] In some embodiments of the present application, obtaining the first gamma value based on the first voltage, the first brightness, the second voltage, the second brightness, an intermediate voltage, and a third brightness comprises:

[0020] taking the first voltage, the intermediate voltage, and the second voltage as horizontal coordinate values, and taking the first brightness, the third brightness, and the second brightness as vertical coordinate values to obtain a relationship curve between brightness and common cathode voltage.

[0021] Calculate the slope of the relationship curve at different point positions, and obtain the first gamma value according to the slope.

[0022] In some embodiments of the present application, the method further comprises:

[0023] If the first potential difference value is 0, the compensation coefficient is 1; if the first potential difference value is greater than 0, the compensation coefficient is less than 1; if the first potential difference value is less than 0, the compensation coefficient is greater than 1.

[0024] The second gamma value is obtained by multiplying the compensation coefficient and the first gamma value.

[0025] In some embodiments of the present application, the method further comprises:

[0026] Obtaining a display panel, and obtaining a corresponding relationship table of different first potential difference values and different compensation coefficients based on the display panel debugging.

[0027] According to the current first potential difference value, the compensation coefficient is obtained from the corresponding relationship table.

[0028] In some embodiments of the present application, the method further comprises:

[0029] Obtaining a plurality of display panels, and obtaining a corresponding relationship table of different first potential difference values and different compensation coefficients based on the plurality of display panels debugging.

[0030] In a second aspect, the present application further provides a display panel, wherein the display panel is debugged by using the display panel gamma debugging method described above.

[0031] In a third aspect, the present application further provides a display device, wherein the display device comprises the display panel described above.

[0032] The beneficial effects of the embodiments of the present application compared with the related art are that the above-mentioned gamma debugging method of a display panel, display panel and display device, the gamma debugging method comprises: obtaining a first voltage, a second voltage and a first gamma value of the display panel, the first voltage is a theoretical common cathode voltage, the second voltage is an actual common cathode voltage, and the first gamma value is a theoretical gamma value; performing subtraction operation on the first voltage and the second voltage to obtain a first potential difference value; obtaining a compensation coefficient according to the first potential difference value, and obtaining a second gamma value according to the compensation coefficient and the first gamma value, the second gamma value is an actual gamma value after debugging; only after the common cathode voltage is debugged, the first gamma value is compensated according to the change difference of the common cathode voltage during the debugging process, so that the gamma value after debugging can be obtained, the debugging steps can be reduced, and the debugging time can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A control circuit structure diagram of a display panel provided by an embodiment of the present application is provided.

[0034] Figure 2 A step diagram of a gamma debugging method of a display panel provided by an embodiment of the present application is provided.

[0035] Figure 3 A step diagram of a gamma debugging method of a display panel provided by another embodiment of the present application is provided.

[0036] Figure 4 A step diagram of a gamma debugging method of a display panel provided by still another embodiment of the present application is provided. DETAILED DESCRIPTION

[0037] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0038] It should be noted that when an element is referred to as being "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0041] It should be noted that OLED display devices, as an advanced display technology, have shown great application potential and broad development prospects in the display field due to their self-luminous, high contrast, wide viewing angle, fast response, and low energy consumption, etc. The OLED display screen does not need a backlight source, and directly emits light through the current-driven organic semiconductor thin film, realizing a full-solid-state display structure, which not only reduces the weight of the device, but also significantly improves the display effect. Especially its excellent color performance and clarity make OLED occupy an important position in the market of high-end smart phones, tablet computers, televisions and wearable devices, etc.

[0042] ELVSS, as the common cathode of the OLED display panel, plays an important role in providing stable voltage to the OLED pixels. Since the OLED display module has strict requirements on power consumption, the voltage adjustment of ELVSS becomes a key link for optimizing the display effect and reducing power consumption. Reasonable setting of ELVSS value can ensure that the OLED device operates in the best working state, while reducing unnecessary power consumption and prolonging the service life of the equipment.

[0043] However, the current commonly used ELVSS sheet adjustment concept, that is, first pre-adjusting NOR (Normalization) 1 gamma value for each different module, and then selecting the appropriate ELVSS value according to the inflection point determined by the ELVSS margin, this process is complex and time-consuming, greatly increasing the production line TT (Takt Time), resulting in serious loss of production capacity. With the rapid growth of market demand for OLED display products, improving production efficiency and shortening production cycle have become urgent problems to be solved.

[0044] Therefore, the present application improves the related gamma debugging method of the display panel, the display panel and the display device.

[0045] Please refer to Figure 1 and Figure 2 , Figure 1 shows a control circuit structure schematic diagram of the display panel provided by the embodiment, Figure 2 shows a step diagram of the gamma debugging method of the display panel provided by the embodiment. Specifically, Figure 1The 8T1C control circuit in the display panel of the present embodiment is disclosed. The gamma debugging method of a display panel of the present embodiment comprises:

[0046] S100: Obtain the first voltage, the second voltage and the first gamma value of the display panel, the first voltage being the theoretical common cathode voltage, the second voltage being the actual common cathode voltage, and the first gamma value being the theoretical gamma value.

[0047] Specifically, the theoretical common cathode voltage is the voltage value that the common cathode in the display panel should maintain to optimize the display effect. According to the circuit model, material characteristics and expected display effect of the display panel, the theoretical common cathode voltage can be obtained by calculation. The actual common cathode voltage is the voltage value actually measured on the common cathode during the actual operation of the display panel. The voltage on the common cathode is measured when the display panel is working using a voltmeter or an oscilloscope and other devices.

[0048] It needs to be explained that the gamma value is an important physical property of the display, which describes the non-linear relationship between the output brightness of the display and the input signal. The theoretical gamma value is the ideal value calculated according to the design target and display effect.

[0049] S200: Perform subtraction operation on the first voltage and the second voltage to obtain the first potential difference value.

[0050] Specifically, the voltage value of the first voltage is subtracted from the voltage value of the second voltage to obtain the first voltage difference value. Alternatively, the voltage value of the second voltage is subtracted from the voltage value of the second voltage to obtain the first voltage difference value. It needs to be explained that the first voltage difference value reflects the degree of deviation between the actual voltage and the theoretical voltage. The greater the absolute value of the first voltage difference value, the greater the degree of voltage deviation.

[0051] S300: Obtain the compensation coefficient according to the first potential difference value, and obtain the second gamma value according to the compensation coefficient and the first gamma value, the second gamma value being the actual gamma value after debugging.

[0052] Specifically, the present embodiment obtains a compensation coefficient according to the first potential difference value (i.e. the difference value between the theoretical common cathode voltage and the actual common cathode voltage), and adjusts the first gamma value (theoretical gamma value) using this compensation coefficient to obtain the second gamma value (actual gamma value after debugging). The compensation coefficient (k) can be obtained based on a series of predefined rules, lookup table (LUT) or complex algorithm, which maps the potential difference value to the corresponding compensation coefficient. The compensation coefficient can be the result of a linear or nonlinear function, depending on the characteristics of the display panel and the calibration method of the manufacturer.

[0053] In some embodiments of the present application, please refer to Figure 3 ,Figure 3 A step diagram of the gamma debugging method of the display panel provided by the present embodiment is shown. Step S100 of the present embodiment comprises:

[0054] S110: Obtain a first voltage, and adjust the common cathode voltage of the display panel to the first voltage to obtain a first luminance of the display panel.

[0055] Specifically, a first voltage (i.e. a theoretical common cathode voltage) is obtained, and the common cathode voltage of the display panel is adjusted to this value to observe or measure a first luminance of the display panel under this condition. The first voltage represents a voltage value that the display panel should maintain under optimal performance. After the common cathode voltage is adjusted to the first voltage, the luminance of the display panel can be measured using a luminance meter, a photometer, or other appropriate measuring equipment.

[0056] S120: Obtain an adjustment potential difference, and adjust the common cathode voltage of the display panel from the first voltage to a second voltage according to the adjustment potential difference to obtain a second luminance of the display panel.

[0057] Specifically, an adjustment potential difference is obtained, and the common cathode voltage of the display panel is adjusted from the first voltage (i.e. the theoretical common cathode voltage) to a second voltage (i.e. the actual or adjusted common cathode voltage) according to this potential difference to observe or measure a second luminance of the display panel under this condition.

[0058] It can be understood that the adjustment potential difference refers to the voltage difference that needs to be adjusted, which can be based on the difference between the first voltage (the theoretical value) and the second voltage (the target value). The common cathode voltage of the display panel can be gradually or instantaneously adjusted from the first voltage to the second voltage.

[0059] S130: Obtain a first gamma value based on the first voltage, the first luminance, the second voltage, and the second luminance.

[0060] Specifically, the gamma correction curve describes the relationship between the output luminance (L) of the display device and the input signal (such as voltage V or grayscale value), which can be generally expressed as L=V^γ, where γ is the gamma value. The gamma value can be estimated by two voltage points and two luminances. It needs to be explained that due to the perception characteristics of the human eye, gamma correction is usually used to adjust the output of the display device in order to visually produce more uniform luminance changes.

[0061] In some embodiments of the present application, step S130 comprises:

[0062] S131: obtain a first gamma value based on the first voltage, the first brightness, the second voltage, the second brightness, an intermediate voltage, and a third brightness; wherein the intermediate voltage is an intermediate voltage for adjusting the common cathode voltage of the display panel from the first voltage to the second voltage, and the third brightness is a brightness of the display panel when the common cathode voltage of the display panel is the intermediate voltage.

[0063] Specifically, the second voltage is less than the first voltage; that is, the intermediate voltage is obtained by taking a value less than the first voltage, and finally the second voltage is obtained.

[0064] In some embodiments of the present application, step S120 comprises:

[0065] S121: obtain a plurality of adjustment potential differences, and adjust the first voltage to the second voltage step by step based on the plurality of adjustment potential differences.

[0066] Specifically, step-by-step adjustment can be achieved by adjusting the voltage in a plurality of small steps, which can more smoothly and accurately realize the transition from the first voltage to the second voltage, reduce the potential damage of voltage mutation to the device or the display panel, and improve the stability of the display effect. And step-by-step adjustment can obtain more intermediate voltages to improve the accuracy of the first gamma value. Wherein, the step length of each adjustment is determined by the adjustment potential difference.

[0067] S122: obtain a plurality of third brightnesses when the common cathode voltage of the display panel is the plurality of intermediate voltages.

[0068] Specifically, according to the plurality of adjustment potential differences determined in step S121, the common cathode voltage of the display panel is adjusted from the first voltage (initial voltage) to the second voltage (target voltage) step by step. In this process, a plurality of intermediate voltages are formed. Each intermediate voltage is a transition value between the first voltage and the second voltage, and the interval between them is determined by the adjustment potential difference. More intermediate voltages and transition values can improve the accuracy of the first gamma value.

[0069] In some embodiments of the present application, the plurality of adjustment potential differences of the present embodiment are the same or different; and the plurality of adjustment potential differences are all not less than the minimum adjustment step in the display panel circuit.

[0070] It needs to be explained that if the multiple adjustment potential differences are the same, the same potential is adjusted at each level, that is, the increased or decreased voltage value is the same when adjusting from the current voltage to the next voltage each time. The advantage of this method is to simplify the adjustment process, because it is not necessary to set the adjustment potential difference for each voltage level separately. If the multiple adjustment potential differences are different, different adjustment potential differences can be set according to the specific luminance response characteristics of the display panel. For example, in the voltage range where the luminance changes quickly, a smaller adjustment potential difference can be used to ensure the accuracy of the measurement; while in the voltage range where the luminance changes slowly, a larger adjustment potential difference can be used to speed up the adjustment speed.

[0071] It can be understood that the minimum adjustment step is a parameter specified in the design of the display panel circuit, which represents the minimum value that the circuit can stably and accurately adjust the voltage. This value is usually limited by the circuit design, manufacturing process and components used. If the adjustment potential difference is less than the minimum adjustment step, the circuit may not be able to stably adjust to the target voltage, resulting in inaccurate measurement results or unstable luminance performance of the display panel.

[0072] In some embodiments of the present application, step S131 comprises:

[0073] Taking the first voltage, the intermediate voltage, and the second voltage as the horizontal coordinate values and the first luminance, the third luminance, and the second luminance as the vertical coordinate values, a relationship curve of luminance and common cathode voltage is obtained.

[0074] Specifically, the relationship curve only represents the relationship between the luminance and the common cathode voltage under the current measurement condition.

[0075] The slope of the relationship curve at different points is calculated, and the first gamma value is obtained according to the slope.

[0076] Specifically, the corresponding first gamma value under the current voltage condition can be obtained according to the relationship curve. That is, the first gamma value can be estimated by the above-mentioned method, but this first gamma value usually cannot accurately represent the gamma value of the display panel, and needs to be compensated by the debugging method disclosed in other embodiments of the present application. For example, the coordinate system of the relationship curve is with the common cathode voltage as the horizontal coordinate and the luminance as the vertical coordinate, and the first gamma value is obtained by calculating the slope of the relationship curve.

[0077] In some embodiments of the present application, step S300 comprises:

[0078] S310: If the first potential difference value is 0, the compensation coefficient is 1; if the first potential difference value is greater than 0, the compensation coefficient is less than 1; if the first potential difference value is less than 0, the compensation coefficient is greater than 1.

[0079] S320: multiplying the compensation coefficient and the first gamma value to obtain a second gamma value.

[0080] It can be understood that, in the case that the first potential difference value is obtained by subtracting the voltage value of the second voltage from the voltage value of the first voltage; if the first potential difference value is 0, the first voltage is equal to the second voltage, which means that the theoretical common cathode voltage is equal to the actual common cathode voltage. At this time, the first gamma value can be used as the gamma value of the display panel without adjusting and compensating the gamma value.

[0081] If the first potential difference value is greater than 0, the first voltage is greater than the second voltage. At this time, a suitable compensation coefficient is selected, and the compensation is less than 1, so that the first gamma value can be reduced to the second gamma value.

[0082] If the first potential difference value is less than 0, the first voltage is less than the second voltage. At this time, a suitable compensation coefficient is selected, and the compensation is greater than 1, so that the first gamma value can be increased to the second gamma value.

[0083] In some embodiments of the present application, before step S300, the method further comprises:

[0084] S410: obtaining a display panel, and obtaining a corresponding relationship table of different first potential difference values and different compensation coefficients based on the display panel debugging; that is, the corresponding relationship table can be obtained by pre-acquiring data of the display panel.

[0085] S420: querying the compensation coefficient in the corresponding relationship table according to the current first potential difference value. Specifically, during the debugging process, the corresponding compensation coefficient in the corresponding relationship table can be directly consulted according to the first potential difference value, and the second gamma value can be directly obtained according to the compensation coefficient and the first gamma value, which is beneficial to improve the debugging efficiency and reduce the debugging time.

[0086] In some embodiments of the present application, step S410 comprises:

[0087] S411: obtaining a plurality of display panels, and obtaining a corresponding relationship table of different first potential difference values and different compensation coefficients based on the plurality of display panels. It should be explained that the more accurate corresponding relationship table can be obtained according to the plurality of display panels.

[0088] Embodiment 1: please refer to Figure 4 , Figure 4 The figure shows the steps of the gamma debugging method of the display panel provided in the embodiment; specifically, first, ELVSS (equivalent to common cathode voltage) chip tuning is performed, and then the actual gamma value is compensated according to the first voltage difference value obtained by chip tuning.

[0089] In the ELVSS slice step, first, nor1 Band (standardized range) is selected, that is, according to the specifications and requirements of the display panel, an appropriate nor1 Band is selected for pre-adjustment. The nor1 Band region represents the main working range of the screen under normal brightness.

[0090] Then, the ELVSS voltage is adjusted, that is, a theoretical ELVSS voltage (first voltage) is selected and N steps (adjustment potential difference value) downward (step≥PMIC adjustment minimum step) are selected. The PMIC adjustment minimum step refers to the minimum adjustment unit or step that the PMIC (power management integrated circuit) can reach when adjusting voltage, current, and other parameters. The corresponding screen brightness (LVA\LVB\LVC, etc.) under the ELVSS voltage (ELVSSA\ELVSSB\ELVSSC, etc.) is taken, the brightness-common cathode voltage curve slope (W1\W2\W3, etc.) of each node is calculated, and after comparison with the simulation theoretical value, the actual ELVSS voltage (second voltage) and the first gamma value of the screen are determined.

[0091] In the gamma value compensation step, if the actual ELVSS voltage is equal to the default ELVSS voltage (first voltage), the pre-adjusted NOR1 gamma value register value is directly assigned; that is, the first gamma value is taken as the actual second gamma value.

[0092] When the actual ELVSS voltage is not equal to the default ELVSS voltage (corresponding to the theoretical common cathode voltage described above), the Offset value (first potential difference value) is calculated, Offset=ELVSS 默认 -ELVSS 实际 , and the ELVSS and VrefN2 of all Bands are offset; in this process, the ELVSS gear is judged, the NOR1 gamma value register value is multiplied by the corresponding gear coefficient (compensation coefficient), and the value is assigned.

[0093] Finally, the gamma of other BANDs outside the NOR1 Band is adjusted, and the entire adjustment process is completed.

[0094] In the gamma adjustment method of the embodiment, whether the ELVSS voltage changes after the ELVSS slice adjustment is judged: if the ELVSS does not change (maintains the default voltage), NOR1 is not re-adjusted; if the ELVSS changes, the change to which gear is judged, and the corresponding NOR1 gamma value is directly assigned a coefficient, and the coefficient is obtained by fitting the data collected in the early stage.

[0095] The embodiment adds ELVSS voltage judgment code, when the NOR1 Band is debugged, the gamma value register value can be used, and can be directly assigned or coefficient assigned. The NOR1 Band can be debugged only once, and subsequent gamma value debugging does not need to be debugged in the full Band, thereby reducing the advantages of production line TT and the like. Specifically, compared with the related art, the embodiment can effectively reduce the production line TT by about 10S.

[0096] Further, in order to better implement the display panel gamma debugging method in any of the above embodiments, on the basis of the display panel gamma debugging method, the application also provides a display panel, which is debugged by using the display panel gamma debugging method.

[0097] In some embodiments, the display panel can be an OLED display panel.

[0098] Further, in order to better implement the display panel in any of the above embodiments, on the basis of the display panel, the application also provides a display device, which comprises the display panel.

[0099] In some embodiments, the display device can be a mobile phone, a tablet computer, a computer, and the like.

[0100] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0101] The above has described the basic concept, and it is obvious that the above detailed disclosure is only used as an example and does not constitute a limitation on the application. Although it is not explicitly stated here, those skilled in the art can make various modifications, improvements and corrections to the application. Such modifications, improvements and corrections are suggested in the application, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the application.

[0102] At the same time, specific words are used in the application to describe the embodiments of the application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that the "an embodiment" or "one embodiment" or "one alternative embodiment" mentioned in different places in the specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the application can be properly combined.

[0103] For the same reasons, it is noted that the foregoing description of embodiments of the application has been presented for the purposes of illustration and description, and is not intended to be exhaustive or to limit the application to the precise form disclosed. The described embodiments were chosen and described in order to best explain the principles of the application and the practical application and implementations thereof. It is intended that the scope of the application be defined by the following claims and their equivalents.

[0104] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A gamma adjustment method for a display panel, characterized in that, The gamma debugging method includes: The first voltage, the second voltage, and the first gamma value of the display panel are obtained. The first voltage is the theoretical common cathode voltage, the second voltage is the actual common cathode voltage, and the first gamma value is the theoretical gamma value. The first voltage and the second voltage are subtracted to obtain the first potential difference value; The compensation coefficient is obtained based on the first potential difference value, and the second gamma value is obtained based on the compensation coefficient and the first gamma value. The second gamma value is the actual gamma value after adjustment. The step of obtaining a compensation coefficient based on the first potential difference value and obtaining a second gamma value based on the compensation coefficient and the first gamma value includes: If the first potential difference is 0, the compensation coefficient is 1; if the first potential difference is greater than 0, the compensation coefficient is less than 1; if the first potential difference is less than 0, the compensation coefficient is greater than 1. The second gamma value is obtained by multiplying the compensation coefficient and the first gamma value.

2. The gamma adjustment method for a display panel according to claim 1, characterized in that, The step of obtaining the first voltage, second voltage, and first gamma value of the display panel includes: The first voltage is obtained, and the common cathode voltage of the display panel is adjusted to the first voltage to obtain the first brightness of the display panel; Obtain the adjustment potential difference, and adjust the common cathode voltage of the display panel from the first voltage to the second voltage according to the adjustment potential difference to obtain the second brightness of the display panel; The first gamma value is obtained based on the first voltage, the first brightness, the second voltage, and the second brightness.

3. The gamma adjustment method for a display panel according to claim 2, characterized in that, The first gamma value is obtained based on the first voltage, the first brightness, the second voltage, and the second brightness, including: The first gamma value is obtained based on the first voltage, the first brightness, the second voltage, the second brightness, the intermediate voltage, and the third brightness; wherein, the intermediate voltage is the intermediate voltage at which the common cathode voltage of the display panel is adjusted from the first voltage to the second voltage, and the third brightness is the brightness of the display panel when the common cathode voltage of the display panel is the intermediate voltage.

4. The gamma adjustment method for a display panel according to claim 3, characterized in that, The step of obtaining the adjustment potential difference and adjusting the common cathode voltage of the display panel from the first voltage to the second voltage based on the adjustment potential difference to obtain the second brightness of the display panel includes: Multiple adjustment potential differences are obtained, and the first voltage is gradually adjusted to the second voltage based on the multiple adjustment potential differences; Multiple third brightness levels are obtained when the common cathode voltage of the display panel is a plurality of the intermediate stage voltages.

5. The gamma adjustment method for a display panel according to claim 3, characterized in that, The multiple adjustment potential differences may be the same or different; and the multiple adjustment potential differences are not less than the minimum adjustment step size in the circuit of the display panel; Optionally, obtaining the first gamma value based on the first voltage, the first brightness, the second voltage, the second brightness, the intermediate voltage, and the third brightness includes: Using the first voltage, the intermediate stage voltage, and the second voltage as the horizontal axis, and the first brightness, the third brightness, and the second brightness as the vertical axis, a curve showing the relationship between brightness and common cathode voltage is obtained. Calculate the slope of the relationship curve at different points, and obtain the first gamma value based on the slope.

6. The gamma adjustment method for a display panel according to claim 1, characterized in that, Before the step of obtaining the compensation coefficient based on the first potential difference value, the method further includes: Obtain the display panel, and based on the display panel, debug to obtain a table showing the correspondence between different first potential difference values ​​and different compensation coefficients; The compensation coefficient is retrieved from the corresponding table based on the current first potential difference value.

7. The gamma adjustment method for a display panel according to claim 6, characterized in that, The step of acquiring the display panel and, based on the display panel, debugging to obtain the correspondence table of different first potential difference values ​​and different compensation coefficients includes: Multiple display panels are acquired, and a table showing the correspondence between different first potential difference values ​​and different compensation coefficients is obtained based on the multiple display panels.

8. A display panel, characterized in that, The display panel is debugged using the gamma debugging method for the display panel as described in any one of claims 1 to 7.

9. A display device, characterized in that, The display device includes the display panel as described in claim 8.

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