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

Abstract

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

Description

Technical Field

[0001] The present application belongs to the technical field of display devices, and in particular, relates to a gamma adjustment method for a display panel, a display panel, and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) display devices have shown 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 OLED pixels. Since OLED display modules have strict requirements on power consumption, voltage adjustment of ELVSS becomes a key link in optimizing display effects and reducing power consumption. Reasonable ELVSS value setting can ensure that OLED devices operate in the best working state, while reducing unnecessary power consumption and extending the service life of the equipment.

[0003] However, the gamma debugging time of current display panels is long, which affects the production line efficiency. Therefore, how to improve the debugging efficiency of gamma debugging is a problem that those skilled in the art need to solve at present. Summary of the invention

[0004] The purpose of the present application is to provide a gamma debugging method for a display panel, a display panel and a display device, aiming to solve the problem of long debugging time of gamma debugging in traditional technology.

[0005] A first aspect of an embodiment of the present application provides a gamma adjustment method for a display panel, the gamma adjustment method comprising:

[0006] Acquire a first voltage, a second voltage, and a first gamma value of the display panel, wherein 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;

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

[0008] A compensation coefficient is obtained according to the first potential difference value, and a second gamma value is obtained according to the compensation coefficient and the first gamma value, wherein the second gamma value is an actual gamma value after debugging.

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

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

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

[0012] The first gamma value is obtained 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 includes:

[0014] The first gamma value is obtained based on the first voltage, the first brightness, the second voltage, the second brightness, the intermediate level voltage and the third brightness; wherein the intermediate level brightness 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 the brightness of the display panel when the common cathode voltage of the display panel is the intermediate level voltage.

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

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

[0017] A plurality of third brightnesses are obtained when the common cathode voltage of the display panel is a plurality of the intermediate level voltages.

[0018] In some embodiments of the present application, the multiple adjustment potential differences are the same or different; and the multiple adjustment potential differences are not less than the 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 includes:

[0020] The first voltage, the intermediate voltage, and the second voltage are taken as values ​​of the horizontal axis, and the first brightness, the third brightness, and the second brightness are taken as values ​​of the vertical axis to obtain a relationship curve between brightness and the common cathode voltage;

[0021] The slope of the relationship curve at different points is calculated, and the first gamma value is obtained according to the slope.

[0022] In some embodiments of the present application, 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 includes:

[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, before the step of obtaining the compensation coefficient according to the first potential difference value, the method further includes:

[0026] Acquire a display panel, and obtain a correspondence table between different first potential difference values ​​and different compensation coefficients based on debugging of the display panel;

[0027] The compensation coefficient is searched in the corresponding relationship table according to the current first potential difference value.

[0028] In some embodiments of the present application, the obtaining of the display panel and obtaining a correspondence table between different first potential difference values ​​and different compensation coefficients based on the display panel debugging include:

[0029] A plurality of display panels are obtained, and a corresponding relationship table between different first potential difference values ​​and different compensation coefficients is obtained based on debugging of the plurality of display panels.

[0030] In a second aspect, the present application further provides a display panel, which is debugged using the above-mentioned gamma debugging method for display panels.

[0031] In a third aspect, the present application also provides a display device, which includes the above-mentioned display panel.

[0032] Compared with the related art, the embodiments of the present invention have the following beneficial effects: the above-mentioned gamma debugging method of a display panel, a display panel and a 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 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; obtaining a compensation coefficient according to the first potential difference, and obtaining a second gamma value according to the compensation coefficient and the first gamma value, and the second gamma value being an actual gamma value after debugging; in the debugging process, the present application only needs to compensate the first gamma value according to the change difference of the common cathode voltage after debugging the common cathode voltage, so as to obtain the gamma value after debugging, which can reduce the debugging steps and help reduce the debugging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a control circuit structure of a display panel provided in one embodiment of the present application;

[0034] Figure 2 A step diagram of a gamma adjustment method for a display panel provided in one embodiment of the present application;

[0035] Figure 3 A step diagram of a gamma adjustment method for a display panel provided in another embodiment of the present application;

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

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

[0038] It should be noted that when an element is referred to as being "disposed 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", "up", "down", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] It is important to know that OLED display devices, as an advanced display technology, have shown great application potential and broad development prospects in the display field with their significant advantages such as self-luminescence, high contrast, wide viewing angle, fast response and low energy consumption. OLED display screens do not require backlight sources, and directly emit light through electric current-driven organic semiconductor films, realizing a fully solid-state display structure, which not only reduces the weight of the device, but also significantly improves the display effect. In particular, its excellent color expression and clarity make OLED occupy an important position in the markets of high-end smartphones, tablets, TVs and wearable devices.

[0042] As the common cathode of the OLED display panel, ELVSS plays an important role in providing a 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 in optimizing the display effect and reducing power consumption. Reasonable ELVSS value setting can ensure that the OLED device operates in the best working state, while reducing unnecessary power consumption and extending the service life of the device.

[0043] However, the commonly used ELVSS chip adjustment concept, that is, pre-adjusting the 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, is a complex and time-consuming process, which greatly increases the TT (Takt Time) of the production line and leads to serious production capacity loss. With the rapid growth of market demand for OLED display products, improving production efficiency and shortening production cycles have become urgent issues to be solved.

[0044] Therefore, based on this, the present application improves the gamma adjustment method of the related display panel, the display panel and the display device.

[0045] See also Figure 1 and Figure 2 , Figure 1 FIG. 1 shows a schematic diagram of the control circuit structure of the display panel provided in this embodiment. Figure 2 The following is a step diagram of the gamma adjustment method of the display panel provided by this embodiment. Specifically, Figure 1The 8T1C control circuit in the display panel of this embodiment is disclosed. A gamma debugging method of a display panel of this embodiment includes:

[0046] S100: Acquire a first voltage, a second voltage, and a first gamma value of a display panel, where 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.

[0047] Specifically, the theoretical common cathode voltage is the voltage value that the common cathode in the display panel should maintain, which is designed or calculated to optimize the display effect. The theoretical common cathode voltage can be calculated based on the circuit model, material properties and expected display effect of the display panel. The actual common cathode voltage is the voltage value actually measured on the common cathode of the display panel during actual operation. Use a voltmeter or oscilloscope or other equipment to measure the voltage on the common cathode when the display panel is working.

[0048] It should be explained that the gamma value is an important physical property of the display, which describes the nonlinear relationship between the display output brightness and the input signal. The theoretical gamma value is an ideal value calculated based on the design goals and display effects.

[0049] S200: performing a subtraction operation on the first voltage and the second voltage to obtain a 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. Alternatively, the voltage value of the second voltage is subtracted from the voltage value of the second voltage to obtain the first voltage difference. It should be explained that the first voltage difference reflects the degree of deviation between the actual voltage and the theoretical voltage. The larger the absolute value of the first voltage difference is, the greater the degree of voltage deviation is.

[0051] S300: 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, wherein the second gamma value is an actual gamma value after debugging.

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

[0053] In some embodiments of this application, please refer to Figure 3 , Figure 3 The step diagram of the gamma adjustment method of the display panel provided by this embodiment is shown. Step S100 of this embodiment includes:

[0054] S110: Obtain a 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.

[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 brightness of the display panel under this condition, and 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, a brightness meter, a photometer, or other appropriate measuring equipment can be used to measure the brightness of the display panel.

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

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

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

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

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

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

[0062] S131: Obtain a first gamma value based on a first voltage, a first brightness, a second voltage, a second brightness, an intermediate voltage and a third brightness; wherein the intermediate brightness 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 the 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 scalaring downward based on the first voltage, and finally the second voltage is obtained.

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

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

[0066] Specifically, the step-by-step adjustment can achieve a smoother and more accurate transition from the first voltage to the second voltage through multiple small-step voltage adjustments, reduce potential damage to the device or display panel caused by voltage mutations, and improve the stability of the display effect. In addition, the step-by-step adjustment can obtain more intermediate voltages to improve the accuracy of the first gamma value. The step size of each adjustment is determined by the adjustment potential difference.

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

[0068] Specifically, according to the multiple adjustment potential differences determined in step S121, the common cathode voltage of the display panel is adjusted step by step from the first voltage (initial voltage) to the second voltage (target voltage). In this process, multiple 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. The accuracy of the first gamma value can be improved by more intermediate voltages and transition values.

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

[0070] It should be explained that if multiple adjustment potential differences are the same, each level adjusts the same potential, that is, each time the voltage is adjusted from the current voltage to the next voltage, the increased or decreased voltage value is the same. The advantage of this method is that it simplifies the adjustment process because there is no need to set the adjustment potential difference separately for each voltage level. If multiple adjustment potential differences are different, different adjustment potential differences can be set according to the specific brightness response characteristics of the display panel. For example, in a voltage range where the brightness changes faster, a smaller adjustment potential difference can be used to ensure the accuracy of the measurement; and in a voltage range where the brightness changes slower, a larger adjustment potential difference can be used to speed up the adjustment speed.

[0071] It is understood that the minimum adjustment step is a parameter specified in the display panel circuit design, which indicates the minimum value at which 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 brightness performance of the display panel.

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

[0073] The first voltage, the intermediate voltage, and the second voltage are taken as the horizontal coordinate values, and the first brightness, the third brightness, and the second brightness are taken as the vertical coordinate values, to obtain a relationship curve between the brightness and the common cathode voltage;

[0074] Specifically, the relationship curve only represents the relationship between the brightness 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 first gamma value corresponding to the current voltage condition can be obtained according to the relationship curve. That is, the first gamma value can be estimated by the above method, but this first gamma value usually cannot accurately represent the gamma value of the display panel, and the first gamma value needs to be compensated by the debugging method disclosed in other embodiments of the present application. Exemplarily, the coordinate system where the relationship curve is located is based on the common cathode voltage as the horizontal coordinate and the brightness 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 includes:

[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: Multiply the compensation coefficient and the first gamma value to obtain a second gamma value.

[0080] It can be understood that, in the case where the first potential difference is the voltage value of the first voltage minus the voltage value of the second voltage; if the first potential difference 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. In this case, there is no need to adjust and compensate the gamma value, and the first gamma value can be used as the gamma value of the display panel.

[0081] If the first potential difference 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 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 to increase the first gamma value to the second gamma value.

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

[0084] S410: Acquire a display panel, and obtain a correspondence table between different first potential difference values ​​and different compensation coefficients based on the display panel debugging; that is, the correspondence table can be obtained by collecting data on the display panel in advance.

[0085] S420: Query the compensation coefficient in the correspondence table according to the current first potential difference value. Specifically, during the debugging process, the corresponding compensation coefficient in the correspondence 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 conducive to improving debugging efficiency and reducing debugging time.

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

[0087] S411: Acquire multiple display panels, and obtain a correspondence table of different first potential difference values ​​and different compensation coefficients based on the debugging of the multiple display panels. It should be explained that a more accurate correspondence table can be obtained based on the multiple display panels.

[0088] Example 1: Please refer to Figure 4 , Figure 4 The diagram shows the steps of the gamma adjustment method of the display panel provided by the present embodiment; specifically, firstly, ELVSS (equivalent to the common cathode voltage) chip adjustment is performed, and then the actual gamma value is obtained by compensating the first voltage difference obtained by the chip adjustment.

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

[0090] Then adjust the ELVSS voltage, that is, select the theoretical ELVSS voltage (first voltage) and N steps (adjustment potential difference) downward (step ≥ PMIC adjustment minimum step). The PMIC adjustment minimum step refers to the minimum adjustment unit or step that the PMIC (power management integrated circuit) can achieve when adjusting parameters such as voltage and current. Take the screen brightness (LVA\LVB\LVC, etc.) under the corresponding ELVSS voltage (ELVSSA\ELVSSB\ELVSSC, etc.), calculate the slope of the brightness-common cathode voltage curve of each node (W1\W2\W3, etc.), and compare it with the simulation theoretical value to determine the actual ELVSS voltage (second voltage) and the first gamma value of the screen.

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

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

[0093] Finally, perform gamma debugging on other BANDs outside NOR1 Band to complete the entire debugging process.

[0094] In the gamma debugging method of this embodiment, it is determined whether the ELVSS voltage changes after the ELVSS chip is adjusted: if ELVSS has not changed (maintaining the default voltage), NOR1 is not re-adjusted; if ELVSS changes, it is determined which gear it changes to, and the coefficient is directly assigned to the corresponding gear NOR1 gamma value, and the coefficient is obtained by fitting the previous data collection.

[0095] This embodiment adds the ELVSS voltage judgment code. After the NOR1 Band is debugged, the gamma value register value can be used, and can be directly assigned or assigned a coefficient. It can achieve that the NOR1 Band is only debugged once, and the subsequent gamma value debugging does not require full band debugging, thereby reducing the production line TT and other advantages. Specifically, compared with the related art, this embodiment can effectively reduce the production line TT by about 10S.

[0096] Furthermore, in order to better implement the gamma debugging method of the display panel in any of the above embodiments, based on the above gamma debugging method of the display panel, the present application also provides a display panel, and the display panel is debugged using the above gamma debugging method of the display panel.

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

[0098] Furthermore, in order to better implement the display panel in any of the above embodiments, based on the above display panel, the present application also provides a display device, which includes the above display panel.

[0099] In some embodiments, the display device may be a mobile phone, a tablet, a computer, etc.

[0100] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0101] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

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

[0103] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0104] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all 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 comprises: Acquire a first voltage, a second voltage, and a first gamma value of the display panel, wherein 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 a subtraction operation on the first voltage and the second voltage to obtain a first potential difference value; A compensation coefficient is obtained according to the first potential difference value, and a second gamma value is obtained according to the compensation coefficient and the first gamma value, wherein the second gamma value is an actual gamma value after debugging.

2. The gamma adjustment method of a display panel according to claim 1, characterized in that: The obtaining of the first voltage, the second voltage and the first gamma value of the display panel comprises: Acquire the first voltage, and adjust the common cathode voltage of the display panel to the first voltage to obtain a first brightness of the display panel; Acquire an adjusted potential difference, and adjust the common cathode voltage of the display panel from the first voltage to the second voltage according to the adjusted potential difference to obtain a 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 of a display panel according to claim 2, characterized in that: Obtaining the first gamma value based on the first voltage, the first brightness, the second voltage, and the second brightness includes: The first gamma value is obtained based on the first voltage, the first brightness, the second voltage, the second brightness, the intermediate level voltage and the third brightness; wherein the intermediate level brightness 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 the brightness of the display panel when the common cathode voltage of the display panel is the intermediate level voltage.

4. The gamma adjustment method of a display panel according to claim 3, characterized in that: The obtaining of 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: Acquire a plurality of adjustment potential differences, and adjust the first voltage step by step to the second voltage based on the plurality of adjustment potential differences; A plurality of third brightnesses are obtained when the common cathode voltage of the display panel is a plurality of the intermediate level voltages.

5. The gamma adjustment method of a display panel according to claim 3, characterized in that: The multiple adjustment potential differences are the same or different; and the multiple adjustment potential differences are not less than the minimum adjustment step 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, an intermediate voltage and a third brightness includes: The first voltage, the intermediate voltage, and the second voltage are taken as values ​​of the horizontal axis, and the first brightness, the third brightness, and the second brightness are taken as values ​​of the vertical axis to obtain a relationship curve between brightness and the common cathode voltage; The slope of the relationship curve at different points is calculated, and the first gamma value is obtained according to the slope.

6. The gamma adjustment method of a display panel according to claim 1, characterized in that: The step of acquiring a compensation coefficient according to the first potential difference value, and acquiring a second gamma value according to the compensation coefficient and the first gamma value comprises: 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; The second gamma value is obtained by multiplying the compensation coefficient and the first gamma value.

7. The gamma adjustment method of a display panel according to claim 1, characterized in that: Before the step of obtaining the compensation coefficient according to the first potential difference value, the method further includes: Acquire a display panel, and obtain a correspondence table between different first potential difference values ​​and different compensation coefficients based on debugging of the display panel; The compensation coefficient is searched in the corresponding relationship table according to the current first potential difference value.

8. The gamma adjustment method of a display panel according to claim 7, characterized in that: The obtaining of the display panel and obtaining a correspondence table between different first potential difference values ​​and different compensation coefficients based on the display panel debugging includes: A plurality of display panels are obtained, and a corresponding relationship table between different first potential difference values ​​and different compensation coefficients is obtained based on debugging of the plurality of display panels.

9. A display panel, characterized in that: The display panel is debugged using the gamma debugging method for a display panel according to any one of claims 1 to 9.

10. A display device, characterized in that: The display device comprises the display panel according to claim 10.

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