Gamma debugging method of display device, gamma debugging device thereof and display device

Abstract

The gamma debugging device of the display device is provided, the display device has a first display mode and a second display mode, and the gamma debugging device comprises a target brightness obtaining module and a gamma debugging module, the obtaining module is used for obtaining a first target brightness interval and a first gray scale interval in a first display mode and a second target brightness interval and a second gray scale interval in a second display mode, and the highest target brightness in the first target brightness interval is larger than the highest target brightness in the second target brightness interval; the gamma debugging module is used for carrying out gamma debugging on a plurality of pieces of first target brightness in the first target brightness interval and a plurality of gray scales in the first gray scale interval to obtain a first group of gamma values; and the gamma calculation module is used for calculating a second group of gamma values based on the first group of gamma values according to the relationship between the first target brightness interval and the second target brightness interval for a plurality of target brightness in the second target brightness interval and a plurality of gray scales in the second gray scale interval.

Description

Gamma debugging method of display device, gamma debugging device and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a gamma adjustment method for a display device, a gamma adjustment device, and a display device. Background Art

[0002] In the field of display technology, after display panels are manufactured, a gamma curve is typically used to modulate the brightness of each grayscale. This ensures that the display panel accurately reproduces the varying brightness levels within the image. Enabling display panels to more accurately represent varying brightness levels within an image is a key research topic.

[0003] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure and therefore the above information may contain information that does not constitute prior art.

[0004] Summary of the Invention

[0005] In one aspect, a gamma debugging device for a display device is provided, wherein the display device has a first display mode and a second display mode. In the first display mode, the display device uses a first display area for display, and in the second display mode, the display device uses a second display area for display, wherein an area of ​​the first display area is smaller than an area of ​​the second display area.

[0006] The gamma debugging device comprises:

[0007] a target brightness acquisition module, configured to acquire a first target brightness interval and a first grayscale interval in the first display mode, and a second target brightness interval and a second grayscale interval in the second display mode, wherein the highest target brightness in the first target brightness interval is a first highest target brightness, the highest target brightness in the second target brightness interval is a second highest target brightness, and the second highest target brightness is lower than the first highest target brightness;

[0008] a gamma debugging module, configured to perform gamma debugging on a plurality of target brightnesses in the first target brightness range and a plurality of grayscales in the first grayscale range to obtain a first set of gamma values, wherein the first set of gamma values ​​includes n gamma values, the n gamma values ​​including an i-th gamma value mapping an i-th brightness in the first brightness range to an i-th grayscale in the first grayscale range, where n is a positive integer greater than or equal to 2, and i is a positive integer greater than or equal to 1 and less than or equal to n; and

[0009] A gamma calculation module is used to calculate a second group of gamma values ​​based on the first group of gamma values ​​for multiple target brightnesses in the second target brightness interval and multiple grayscales in the second grayscale interval according to the relationship between the first target brightness interval and the second target brightness interval; wherein, calculating the second group of gamma values ​​based on the first group of gamma values ​​includes: using the i-th gamma value corresponding to the i-th grayscale in the first grayscale interval as the j-th gamma value corresponding to the j-th grayscale in the second grayscale interval, wherein j is a positive integer greater than or equal to 1 and less than or equal to n, and i is not equal to j.

[0010] According to some exemplary embodiments, the maximum grayscale in the second grayscale interval is the nth grayscale;

[0011] The gamma calculation module calculates the second set of gamma values ​​based on the first set of gamma values ​​according to the relationship between the first target brightness range and the second target brightness range, specifically including:

[0012] The gamma calculation module uses the mth first gamma value corresponding to the mth grayscale in the first grayscale interval as the nth second gamma value corresponding to the nth grayscale in the second grayscale interval according to the relationship between the first maximum target brightness and the second maximum target brightness, where m is a positive integer less than n;

[0013] The gamma calculation module uses the i-th first gamma value corresponding to the i-th grayscale in the first grayscale interval as the j-th second gamma value corresponding to the j-th grayscale in the second grayscale interval according to the following formula: i=round[(j-1) / (n-1)×(m-1)]+1;

[0014] Among them, round is the rounding function.

[0015] According to some exemplary embodiments, the gamma calculation module is configured to calculate m using the following formula:

[0016] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0017] According to some exemplary embodiments, the gamma debugging module is further configured to divide the first grayscale interval into a first sub-grayscale interval and a second sub-grayscale interval, wherein the first sub-grayscale interval includes grayscale 1 to grayscale x, and the second sub-grayscale interval includes grayscale x+1 to grayscale n, where x is an integer greater than or equal to 2 and less than or equal to n-1.

[0018] The gamma debugging device further includes a lighting module, which is used to drive the display device to display a preset picture;

[0019] The gamma debugging module performs gamma debugging on the multiple target brightnesses in the first target brightness range and the multiple grayscales in the first grayscale range, specifically including:

[0020] The lighting module drives the display device to display in the third display area, and the gamma adjustment module performs gamma adjustment on multiple grayscales in the first sub-grayscale interval respectively; and

[0021] The lighting module drives the display device to display in the fourth display area, and the gamma adjustment module performs gamma adjustment on multiple grayscales in the second sub-grayscale interval respectively.

[0022] The area of ​​the third display area is larger than that of the fourth display area.

[0023] According to some exemplary embodiments, the gamma debugging module is further configured to calculate x using the following formula:

[0024] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0025] According to some exemplary embodiments, the area of ​​the third display area is equal to the area of ​​the second display area; and / or

[0026] The area of ​​the fourth display area is greater than or equal to the area of ​​the first display area.

[0027] According to some exemplary embodiments, the lighting module driving the display device to display in the third display area further includes compensating the voltage signal of the third display area using a first voltage drop compensation parameter;

[0028] The lighting module driving the display device to display in the fourth display area further comprises compensating the voltage signal of the fourth display area using a second voltage drop compensation parameter;

[0029] The first voltage drop compensation parameter is greater than the second voltage drop compensation parameter. The lighting module drives the display device to display in the fourth display area, and the gamma adjustment module performs gamma adjustment for multiple grayscales in the second sub-grayscale interval, including at least:

[0030] The lighting module drives the display device to display in the fourth display area and uses the ath second voltage drop compensation parameter to compensate the voltage signal of the fourth display area, and the gamma debugging module performs gamma debugging for the ath grayscale;

[0031] The lighting module drives the display device to display in the fourth display area and uses the bth second voltage drop compensation parameter to compensate the voltage signal of the fourth display area, and the gamma debugging module performs gamma debugging for the bth grayscale;

[0032] Wherein, x+1≤a<b≤n, and a and b are both integers, and the a-th second voltage drop compensation parameter is greater than the b-th second voltage drop compensation parameter.

[0033] According to some exemplary embodiments, the gamma debugging device further includes a brightness testing module, wherein the brightness testing module is used to measure the display brightness of the display device;

[0034] The gamma adjustment module is further configured to set at least two binding point grayscales within the first grayscale interval, and grayscales other than the binding point grayscales are non-binding point grayscales;

[0035] The gamma debugging module performs gamma debugging on multiple target brightnesses in the first target brightness range and multiple grayscales in the first grayscale range to obtain a first set of gamma values ​​including:

[0036] The gamma debugging module performs gamma debugging on each of the binding point grayscales to obtain a gamma value, so that the difference between the display brightness measured by the brightness testing module and the target brightness obtained by the target brightness obtaining module at the binding point grayscale of the display device is less than a preset value; and

[0037] The gamma debugging module calculates the gamma value of each non-binding point grayscale according to the gamma value of each binding point grayscale.

[0038] According to some exemplary embodiments, the gamma debugging module performing gamma debugging on each of the binding point grayscales to obtain a gamma value includes: the gamma debugging module performing gamma debugging on each of the binding point grayscales in ascending order of grayscale values.

[0039] According to some exemplary embodiments, the target brightness of the maximum binding point grayscale is less than an upper limit value of a test range of the brightness test module.

[0040] According to some exemplary embodiments, the gamma debugging module is further configured to obtain gamma values ​​corresponding to each non-binding point grayscale higher than the maximum binding point grayscale by an interpolation calculation method based on the gamma values ​​corresponding to each binding point grayscale.

[0041] According to some exemplary embodiments, the gamma debugging device further includes a brightness attenuation module, the brightness attenuation module being located between the light emitting surface of the display device and the brightness testing module, and the light emitted by the display device is brightness-attenuated by the brightness attenuation module according to a preset brightness attenuation coefficient and then emitted to the brightness testing module;

[0042] The product of the target brightness of the maximum binding point grayscale and the brightness attenuation coefficient is less than the upper limit of the test range of the brightness test module.

[0043] In another aspect, a gamma debugging method for a display device is provided, wherein the display device has a first display mode and a second display mode, wherein the display device uses a first display area for display in the first display mode and uses a second display area for display in the second display mode, wherein an area of ​​the first display area is smaller than an area of ​​the second display area;

[0044] The gamma debugging method comprises the following steps:

[0045] Acquire a first target brightness interval and a first grayscale interval in the first display mode, wherein the highest target brightness in the first target brightness interval is a first highest target brightness;

[0046] performing gamma debugging on a plurality of first target brightnesses in the first target brightness range and a plurality of grayscales in the first grayscale range to obtain a first set of gamma values, wherein the first set of gamma values ​​includes n first gamma values, the n first gamma values ​​including an i-th first gamma value mapping an i-th first target brightness in the first brightness range to an i-th grayscale in the first grayscale range, where n is a positive integer greater than or equal to 2, and i is a positive integer greater than or equal to 1 and less than or equal to n;

[0047] Acquire a second target brightness interval and a second grayscale interval in the second display mode, wherein the highest target brightness in the second target brightness interval is a second highest target brightness, and the second highest target brightness is lower than the first highest target brightness;

[0048] For a plurality of target brightnesses in the second target brightness range and a plurality of grayscales in the second grayscale range, a second set of gamma values ​​is calculated based on the first set of gamma values ​​according to a relationship between the first target brightness range and the second target brightness range;

[0049] The step of calculating the second set of gamma values ​​based on the first set of gamma values ​​includes:

[0050] The i-th first gamma value corresponding to the i-th grayscale in the first grayscale interval is used as the j-th second gamma value corresponding to the j-th grayscale in the second grayscale interval, where j is a positive integer greater than or equal to 1 and less than or equal to n, and i is not equal to j.

[0051] According to some exemplary embodiments, the maximum grayscale in the second grayscale interval is the nth grayscale;

[0052] According to the relationship between the first target brightness range and the second target brightness range, calculating the second set of gamma values ​​based on the first set of gamma values ​​includes:

[0053] According to the relationship between the first maximum target brightness and the second maximum target brightness, the mth first gamma value corresponding to the mth grayscale in the first grayscale interval is used as the nth second gamma value corresponding to the nth grayscale in the second grayscale interval, where m is a positive integer less than n;

[0054] The i-th first gamma value corresponding to the i-th grayscale in the first grayscale interval is used as the j-th second gamma value corresponding to the j-th grayscale in the second grayscale interval according to the following formula: i=round[(j-1) / (n-1)×(m-1)]+1;

[0055] Among them, round is the rounding function.

[0056] According to some exemplary embodiments, m is calculated using the following formula:

[0057] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0058] According to some exemplary embodiments, the first grayscale interval includes a first sub-grayscale interval and a second sub-grayscale interval, the first sub-grayscale interval includes grayscale 1 to grayscale x, and the second sub-grayscale interval includes grayscale x+1 to grayscale n, where x is an integer greater than or equal to 2 and less than or equal to n-1.

[0059] The gamma adjustment for the plurality of target brightnesses in the first target brightness range and the plurality of grayscales in the first grayscale range includes:

[0060] driving the display device to display in the third display area, and performing gamma adjustment for each of the plurality of grayscales in the first sub-grayscale interval; and

[0061] driving the display device to display in the fourth display area, and performing gamma adjustment for the plurality of grayscales in the second sub-grayscale interval respectively;

[0062] The area of ​​the third display area is larger than that of the fourth display area.

[0063] According to some exemplary embodiments, x is calculated using the following formula:

[0064] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0065] In another aspect, a display device is provided. The display device includes a display panel and a driver chip bound to the display panel. The driver chip is burned with a first set of gamma values ​​and a second set of gamma values ​​debugged by the above-mentioned gamma debugging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings.

[0067] FIG. 1 is a flowchart of a gamma adjustment method for a display device according to an embodiment of the present disclosure.

[0068] FIG2 is a schematic diagram showing the principle of interpolation calculation in a gamma adjustment method for a display device according to an embodiment of the present disclosure.

[0069] FIG3 is a schematic diagram of a gamma adjustment device for a display device according to an embodiment of the present disclosure.

[0070] FIG4 is a schematic diagram of another gamma adjustment device for a display device according to an embodiment of the present disclosure.

[0071] FIG5 is a schematic diagram showing the principle of brightness attenuation achieved by a brightness attenuation module in a gamma adjustment device for a display device according to an embodiment of the present disclosure.

[0072] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of layers, structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0073] In the following description, for the purpose of explanation, many specific details are set forth to provide a comprehensive understanding of the various exemplary embodiments. However, it is apparent that the various exemplary embodiments can be implemented without these specific details or with one or more equivalent arrangements. In other cases, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various exemplary embodiments. In addition, the various exemplary embodiments can be different, but not necessarily exclusive. For example, the specific shape, configuration, and characteristics of the exemplary embodiment can be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0074] In the accompanying drawings, the sizes and relative sizes of the elements may be exaggerated for clarity and / or descriptive purposes. Thus, the sizes and relative sizes of the individual elements are not necessarily limited to those shown in the drawings. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed differently from the described sequence. For example, two processes described in succession can be performed substantially simultaneously or in an order opposite to the described sequence. In addition, the same reference numerals represent the same elements.

[0075] When an element is described as being "on" another element, "connected to" another element, or "coupled to" another element, the element may be directly on, directly connected to, or directly coupled to another element, or there may be an intermediate element. However, when an element is described as being "directly on" another element, "directly connected to," or "directly coupled to," another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between" versus "directly between," "adjacent" versus "directly adjacent," or "on" versus "directly on," etc. In addition, the term "connected" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection. In addition, the X-axis, the Y-axis, and the Z-axis are not limited to the three axes of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the X-axis, the Y-axis, and the Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as XYZ, XY, YZ, and XZ. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0076] It should be understood that although the terms first, second, etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. For example, a first element may be named a second element, and similarly, a second element may be named a first element without departing from the scope of the exemplary embodiments.

[0077] With the development of display technology, people have higher and higher demands for the display brightness of display devices. For example, based on the highest brightness publicity requirements, or fingerprint requirements, or the requirements of high contrast effects of the whole machine, the display device is required to achieve local highlighting, that is, the display device must have a local highlight mode (Local High Brightness Mode, abbreviated as Local HBM). In addition, the display device also usually has a highlight mode (High Brightness Mode, abbreviated as HBM), which is a display mode triggered by the display device under sunlight or other scenario modes. Therefore, for the two different display modes of HBM and Local HBM, it is usually necessary to debug two different sets of gamma segments separately, which takes a long time to debug and affects production efficiency.

[0078] FIG. 1 is a flowchart of a gamma adjustment method for a display device according to an embodiment of the present disclosure.

[0079] The display device has a first display mode and a second display mode. In the first display mode, the display device uses a first display area for display. In the second display mode, the display device uses a second display area for display. The area of ​​the first display area is smaller than that of the second display area.

[0080] For example, the first display mode is Local HBM, and the area of ​​the first display area is a part of the total display area. According to the actual display requirements of the display device, for example, the area of ​​the first display area is 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8% of the total display area; the second display mode is HBM, and the second display area is the entire display area.

[0081] For example, the display device may be an organic light emitting diode (OLED) display device, a micro organic light emitting diode (Micro LED) display device, a quantum dot light emitting diode (QLED) display device, a liquid crystal display (LCD) display device, etc. Below, the display device is an OLED display device as an example. OLED display devices include mobile phones, tablet computers, etc., which are not listed one by one here.

[0082] For example, display devices generally have multiple different display modes. Taking mobile phones as an example, in addition to the HBM and Local HBM mentioned above, they usually include other display modes. For example, they include three always-on display modes (AOD) and nine normal modes (NOR). Each different display mode has a corresponding gamma value.

[0083] 1 , the gamma adjustment method of the display device may include steps S1010 to S1040 .

[0084] In step S1010 , a first target brightness interval and a first grayscale interval in a first display mode are acquired, and the highest target brightness in the first target brightness interval is a first highest target brightness.

[0085] For example, grayscale refers to the number of shades of light and dark a color can have, from dark to light. The more variations in brightness a color has, the more grayscales it has. The grayscale levels of a display device are primarily determined by the number of bits used in the system's digital-to-analog conversion. For example, an 8-bit processing system has 2^8 grayscale levels, or 256 grayscale levels, meaning there are 256 brightness variations from black to white. Furthermore, the grayscale levels of a display device can be set to 64, 512, 1024, and so on, which are not listed here.

[0086] For example, the first grayscale interval includes grayscale 1, grayscale 2, ..., grayscale n-1, and grayscale n. The grayscale value of grayscale 1 is 0, the grayscale value of grayscale 2 is 1, and the grayscale value of grayscale n is n-1.

[0087] For example, the first target brightness interval includes the 1st first target brightness, the 2nd first target brightness, ... the n-1th first target brightness, and the nth first target brightness, where the 1st first target brightness is the target brightness when the display device displays the 1st grayscale in the first display mode, the 2nd first target brightness is the target brightness when the display device displays the 2nd grayscale in the first display mode, and the nth first target brightness is the target brightness when the display device displays the nth grayscale in the first display mode. The higher the grayscale value, the higher the brightness. Therefore, the highest target brightness in the first target brightness interval should be understood as the nth first target brightness corresponding to the nth grayscale.

[0088] For example, in order to make the display effect of the display device consistent with the visual perception of the human eye, it is necessary to set the relationship between the input grayscale and the corresponding brightness value so that the brightness value is proportional to the grayscale to the power of γ. This relationship between the grayscale brightness value and the grayscale is called the gamma curve of the display device. Exemplarily, the value of γ is set to 2.2±0.2 so that the displayed image is close to the image actually seen by the human eye. Gamma debugging of the display device is to debug the entire grayscale range based on a gamma curve with a set γ value (for example, 2.2), and the target brightness corresponding to each grayscale is calculated according to the gamma curve with a set γ value (for example, 2.2).

[0089] For example, the step of obtaining the first target brightness range and the first grayscale range in the first display mode includes:

[0090] Setting a first maximum target brightness in the first display mode, where the first maximum target brightness is the nth first target brightness corresponding to the nth grayscale;

[0091] Since the target brightness is proportional to the grayscale raised to the power of γ, the target brightness corresponding to each grayscale is calculated based on the first highest target brightness.

[0092] For example, the display device has 256 gray levels, and n is 256.

[0093] In step S1020, gamma debugging is performed on multiple first target brightnesses in the first target brightness interval and multiple grayscales in the first grayscale interval to obtain a first group of gamma values, wherein the first group of gamma values ​​includes n first gamma values, and the n first gamma values ​​include the i-th first gamma value mapping the i-th first target brightness in the first brightness interval and the i-th grayscale in the first grayscale interval, n is a positive integer greater than or equal to 2, and i is a positive integer greater than or equal to 1 and less than or equal to n.

[0094] Among them, the first group of gamma values ​​includes the first gamma value mapping the first brightness in the first brightness range and the first grayscale in the first grayscale range, the second gamma value mapping the second brightness in the first brightness range and the second grayscale in the first grayscale range... and the nth gamma value mapping the nth brightness in the first brightness range and the nth grayscale in the first grayscale range.

[0095] For example, the gamma value obtained by debugging should be understood as the code of the associated data voltage. For example, the number of bits of gamma debugging can be 12 bits, that is, there are 4096 (2 12) gamma values, specifically integers from 0 to 4095. Each gamma value is associated with a specific data voltage. The data voltage and the gamma value are in linear proportion: data voltage = VGMP-(4095-gamma value) / 4095*(VGMP-VGSP), where VGMP is the highest data voltage and VGSP is the lowest data voltage.

[0096] For example, VGMP=7.2V; VGSP=1V.

[0097] In step S1030 , a second target brightness interval and a second grayscale interval in the second display mode are acquired, the highest target brightness in the second target brightness interval is the second highest target brightness, and the second highest target brightness is lower than the first highest target brightness.

[0098] It should be supplemented that, since the area of ​​the first display region corresponding to the first display mode is smaller than the area of ​​the second display region corresponding to the second display mode, the highest target brightness in the first display mode is greater than the target brightness in the second display mode.

[0099] For example, the second grayscale interval is the same as the first grayscale interval, and includes grayscale 1, grayscale 2, ..., grayscale n-1, and grayscale n. The grayscale value of grayscale 1 is 0, the grayscale value of grayscale 2 is 1, and the grayscale value of grayscale n-1.

[0100] For example, the second target brightness interval includes the first second target brightness, the second second target brightness, ... the n-1th second target brightness, and the nth second target brightness, where the first second target brightness is the target brightness when the display device displays the first grayscale in the second display mode, the second second target brightness is the target brightness when the display device displays the second grayscale in the second display mode, and the nth second target brightness is the target brightness when the display device displays the nth grayscale in the second display mode. Higher grayscale values ​​have higher brightness, so the highest target brightness in the second target brightness interval should be understood as the nth second target brightness corresponding to the nth grayscale.

[0101] For example, the step of obtaining the first target brightness range and the first grayscale range in the first display mode includes:

[0102] Set the second highest target brightness in the second display mode, where the second highest target brightness is the nth second target brightness corresponding to the nth grayscale;

[0103] Since the target brightness is proportional to the grayscale raised to the power of γ, the target brightness corresponding to each grayscale is calculated based on the second highest target brightness.

[0104] In step S1040, for multiple target brightnesses in the second target brightness interval and multiple grayscales in the second grayscale interval, a second group of gamma values ​​is calculated based on the first group of gamma values ​​according to the relationship between the first target brightness interval and the second target brightness interval; wherein, calculating the second group of gamma values ​​based on the first group of gamma values ​​includes: using the i-th first gamma value corresponding to the i-th grayscale in the first grayscale interval as the j-th second gamma value corresponding to the j-th grayscale in the second grayscale interval, wherein j is a positive integer greater than or equal to 1 and less than or equal to n, and i is not equal to j.

[0105] In the gamma debugging method for a display device provided in an embodiment of the present disclosure, gamma debugging is first performed on the first target brightness interval and the first grayscale interval in the first display mode of the display device to obtain a first set of gamma values. However, gamma debugging is not directly performed on the second display mode of the display device. Instead, a second set of gamma values ​​is calculated based on the first set of gamma values ​​according to the relationship between the first target brightness interval and the second target brightness interval. The first set of gamma values ​​obtained by debugging is used as the gamma values ​​for the first display mode, and the second set of gamma values ​​obtained by calculation is used as the gamma values ​​for the second display mode. Therefore, for the two different display modes, the first display mode and the second display mode, only one set of gamma values ​​needs to be debugged, which reduces the time for gamma debugging of the display device and improves the efficiency of gamma debugging.

[0106] According to some exemplary embodiments, the maximum grayscale in the second grayscale interval is the nth grayscale, that is, the second grayscale interval is the same as the first grayscale interval, and both have n grayscale levels. According to the relationship between the first target brightness interval and the second target brightness interval, the second set of gamma values ​​calculated based on the first set of gamma values ​​includes:

[0107] According to the relationship between the first maximum target brightness and the second maximum target brightness, the mth first gamma value corresponding to the mth grayscale in the first grayscale interval is used as the nth second gamma value corresponding to the nth grayscale in the second grayscale interval, where m is a positive integer less than n;

[0108] The i-th first gamma value corresponding to the i-th grayscale in the first grayscale interval is used as the j-th second gamma value corresponding to the j-th grayscale in the second grayscale interval according to the following formula: i=round[(j-1) / (n-1)×(m-1)]+1;

[0109] Among them, round is the rounding function.

[0110] According to some exemplary embodiments, m is calculated using the following formula:

[0111] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0112] For example, the value of γ is 2.1, 2.2, or 2.3.

[0113] According to some exemplary embodiments, the first grayscale interval includes a first sub-grayscale interval and a second sub-grayscale interval, the first sub-grayscale interval includes grayscale 1 to grayscale x, and the second sub-grayscale interval includes grayscale x+1 to grayscale n, where x is an integer greater than or equal to 2 and less than or equal to n-1.

[0114] The gamma adjustment for a plurality of target brightnesses in a first target brightness range and a plurality of grayscales in a first grayscale range includes:

[0115] The display device is driven to display in the third display area and gamma adjustment is performed for each of the plurality of grayscales in the first sub-grayscale interval; and the display device is driven to display in the fourth display area and gamma adjustment is performed for each of the plurality of grayscales in the second sub-grayscale interval. The area of ​​the third display area is larger than that of the fourth display area.

[0116] Here, by further dividing the first sub-grayscale interval into a first sub-grayscale interval and a second sub-grayscale interval, the first sub-grayscale interval is used as a low grayscale interval, and debugging is performed based on the larger third display area for the first sub-grayscale interval, which is conducive to ensuring the accuracy of full-screen optical parameters; the second sub-grayscale interval is used as a high grayscale interval, and debugging is performed based on the smaller fourth display area for the second sub-grayscale interval, which can be closer to the actual area used in the first display mode, thereby improving debugging accuracy.

[0117] According to some exemplary embodiments, x is calculated using the following formula:

[0118] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0119] According to some exemplary embodiments, an area of ​​the third display region is equal to an area of ​​the second display region.

[0120] For example, the third display area and the fourth display area are both the entire display area, that is, the areas of the third display area and the fourth display area are both 100%*the area of ​​the entire display area.

[0121] According to some exemplary embodiments, an area of ​​the fourth display region is equal to an area of ​​the first display region.

[0122] For example, the fourth display area and the first display area are both part of the entire display area. Exemplarily, the areas of the fourth display area and the first display area are both 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8% of the area of ​​the entire display area.

[0123] It should be noted that when the area of ​​the fourth display area is equal to the area of ​​the first display area, the fourth display area overlaps with the first display area, or the fourth display area partially overlaps with the first display area, or the fourth display area does not overlap with the first display area. The fourth display area is usually located in the center of the entire display area.

[0124] According to some exemplary embodiments, the fourth display area is larger than the first display area. Actual testing has shown that gamma adjustment based on the slightly larger fourth display area allows the display device, when displaying in the first display mode, to achieve a maximum brightness slightly higher than the first maximum target brightness, i.e., achieving higher brightness while maintaining color coordinate offsets that meet specifications.

[0125] According to some exemplary embodiments, driving the display device to display in the third display area further includes compensating a voltage signal in the third display area using a first voltage drop compensation parameter; and driving the display device to display in the fourth display area further includes compensating the voltage signal in the fourth display area using a second voltage drop compensation parameter, wherein the first voltage drop compensation parameter is greater than the second voltage drop compensation parameter.

[0126] Specifically, when gamma debugging is performed based on the fourth display area with a smaller area, the second voltage drop compensation parameter can be set to be smaller than the first voltage drop compensation parameter. Appropriately reducing the voltage drop compensation parameter is understood as appropriately reducing the compensation value of the voltage signal of the fourth display area, utilizing the load of the display panel itself, which is conducive to achieving higher display brightness.

[0127] According to some exemplary embodiments, driving the display device to display in the fourth display area and performing gamma adjustment for the plurality of grayscales in the second sub-grayscale interval respectively includes at least:

[0128] The display device is driven to display in the fourth display area and compensates the voltage signal in the fourth display area using the ath second voltage drop compensation parameter, and performs gamma adjustment for the ath grayscale. The display device is driven to display in the fourth display area and compensates the voltage signal in the fourth display area using the bth second voltage drop compensation parameter, and performs gamma adjustment for the bth grayscale. Wherein, x+1≤a<b≤n, and a and b are both integers, and the ath second voltage drop compensation parameter is greater than the bth second voltage drop compensation parameter.

[0129] Here, in the second sub-grayscale interval, as the grayscale value increases, the corresponding second voltage drop compensation parameter decreases to ensure the continuity of the debugging result.

[0130] According to some exemplary embodiments, it is characterized in that gamma debugging is performed for multiple target brightnesses in the first target brightness interval and multiple grayscales in the first grayscale interval to obtain a first set of gamma values, including: setting at least two binding point grayscales in the first grayscale interval, and other grayscales other than the binding point grayscales are non-binding point grayscales; for each binding point grayscale, gamma debugging is performed to obtain a gamma value, so that the difference between the display brightness of the display device at the binding point grayscale and the target brightness is less than a preset value; and the gamma value of each non-binding point grayscale is calculated based on the gamma value of each binding point grayscale.

[0131] For example, the gamma adjustment is performed by setting the binding point grayscale according to the following Table 1:

[0132] Table 1

[0133] Wherein, L1max is the first maximum target brightness, the Z1th grayscale, the Z2th grayscale and the Z3th grayscale are selected from any grayscale in the second sub-grayscale interval, and the Z4th grayscale and the Z5th grayscale are selected from any grayscale in the first sub-grayscale interval.

[0134] According to some exemplary embodiments, performing gamma adjustment on each binding point grayscale to obtain a gamma value includes: performing gamma adjustment on each binding point grayscale in sequence according to an increasing order of grayscale values.

[0135] For example, referring to Table 1, the binding point grayscales from low to high are the Z5th grayscale, the Z4th grayscale, the Z3th grayscale, the Z2th grayscale, the Z1th grayscale and 255 (the 256th grayscale). Therefore, when performing gamma debugging, gamma debugging is performed on the Z5th grayscale, the Z4th grayscale, the Z3th grayscale, the Z2th grayscale, the Z1th grayscale and the 256th grayscale in turn.

[0136] The inventors discovered that, because high-brightness displays corresponding to high grayscale values ​​make it difficult for a display device to achieve stable display brightness in a short period of time, this can result in significant brightness decay during gamma adjustment, affecting the accuracy of gamma adjustment. Therefore, during gamma adjustment, gamma adjustment is performed on the grayscales of each binding point in ascending order of grayscale values, gradually transitioning the display device from low to high display brightness. This ensures that, when gamma adjustment is performed on high grayscales, the brightness of the display device in the instantaneous state during adjustment is substantially equal to the brightness in the actual steady state, thereby ensuring the accuracy of gamma adjustment.

[0137] Actual testing has shown that when gamma adjustment is performed from grayscale 255 to grayscale 0, the gamma adjustment can be completed normally. However, when the display device is re-lit for chromaticity testing, the y value of the color coordinates in the high grayscale display screen is low, that is, a certain degree of color deviation occurs. When gamma adjustment is performed from grayscale 255 to grayscale 0, after the gamma adjustment is completed, the display device is re-lit for chromaticity testing, and the measured color coordinates meet the required specifications.

[0138] According to some exemplary embodiments, the display brightness is measured by a brightness test module, and the target brightness of the maximum binding point grayscale is less than the upper limit of the test range of the brightness test module. This avoids the brightness test module crashing due to over-range during brightness testing, which may cause gamma debugging to be interrupted.

[0139] According to some exemplary embodiments, the gamma values ​​corresponding to each non-binding point grayscale higher than the maximum binding point grayscale are obtained by interpolation calculation based on the gamma values ​​corresponding to each binding point grayscale.

[0140] For example, referring to Table 1, the preset binding point grayscales, from low to high, are grayscale Z5, grayscale Z4, grayscale Z3, grayscale Z2, grayscale Z1, and 255 (grayscale 256). The target brightness corresponding to grayscale Z5, grayscale Z4, and grayscale Z3 is lower than the upper limit of the test range of the brightness test module, while the target brightness corresponding to grayscale Z2, grayscale Z1, and 255 (grayscale 256) is higher than the upper limit of the test range of the brightness test module. Therefore, the binding point grayscales are adjusted to grayscale Z5, grayscale Z4, and grayscale Z3. After gamma adjustment, the gamma values ​​corresponding to grayscale Z5, grayscale Z4, and grayscale Z3 are A, B, and C, respectively.

[0141] FIG2 is a schematic diagram showing the principle of interpolation calculation in a gamma adjustment method for a display device according to an embodiment of the present disclosure.

[0142] Referring to Figure 2, the gamma values ​​of grayscale Z2, grayscale Z1, and grayscale 255 (256) are calculated using the interpolation method based on A, B, and C, which are D, E, and F, respectively. The specific calculation formulas are as follows: D = C + round [(CB) / (Z3 - Z4) × (Z2 - Z3)]; E = C + round [(CB) / (Z3 - Z4) × (Z1 - Z3)]; F = C + round [(CB) / (Z3 - Z4) × (256 - Z3)];

[0143] Among them, round represents the rounding function.

[0144] According to some exemplary embodiments, the light emitted by the display device is attenuated by the brightness attenuation module according to a preset brightness attenuation coefficient and then emitted to the brightness test module, and the product of the target brightness of the maximum binding point grayscale and the brightness attenuation coefficient is less than the upper limit value of the test range of the brightness test module.

[0145] FIG3 is a schematic diagram of a gamma adjustment device for a display device according to an embodiment of the present disclosure.

[0146] 3 , a gamma adjustment device for a display device is provided. The display device 100 has a first display mode and a second display mode. In the first display mode, the display device uses a first display area for display, and in the second display mode, the display device uses a second display area for display. The area of ​​the first display area is smaller than that of the second display area.

[0147] The gamma adjustment device 200 includes a target brightness acquisition module 210 , a gamma adjustment module 220 and a gamma calculation module 230 .

[0148] Among them, the target brightness acquisition module 210 is used to obtain the first target brightness interval and the first grayscale interval in the first display mode and the second target brightness interval and the second grayscale interval in the second display mode. The highest target brightness in the first target brightness interval is the first highest target brightness, and the highest target brightness in the second target brightness interval is the second highest target brightness, and the second highest target brightness is less than the first highest target brightness.

[0149] The gamma debugging module 220 is electrically connected to the target brightness acquisition module 210, receives the first target brightness interval and the first grayscale interval in the first display mode and the second target brightness interval and the second grayscale interval in the second display mode acquired by the target brightness acquisition module 210, and performs gamma debugging on the display device 100 for multiple target brightnesses in the first target brightness interval and multiple grayscales in the first grayscale interval to obtain a first group of gamma values, and the first group of gamma values ​​serves as the gamma value of the first display mode, wherein the first group of gamma values ​​includes n gamma values, and the n gamma values ​​include the i-th gamma value mapping the i-th brightness in the first brightness interval and the i-th grayscale in the first grayscale interval, where n is a positive integer greater than or equal to 2, and i is a positive integer greater than or equal to 1 and less than or equal to n.

[0150] The gamma calculation module 230 is electrically connected to the gamma debugging module 220, and is used to obtain a first group of grayscale values ​​obtained by the gamma debugging module 220 through gamma debugging, and for multiple target brightnesses in the second target brightness interval and multiple grayscales in the second grayscale interval, calculate a second group of gamma values ​​based on the first group of gamma values ​​according to the relationship between the first target brightness interval and the second target brightness interval; wherein, calculating the second group of gamma values ​​based on the first group of gamma values ​​includes: using the i-th gamma value corresponding to the i-th grayscale in the first grayscale interval as the j-th gamma value corresponding to the j-th grayscale in the second grayscale interval, wherein j is a positive integer greater than or equal to 1 and less than or equal to n, and i is not equal to j.

[0151] According to some exemplary embodiments, the maximum grayscale in the second grayscale interval is the nth grayscale;

[0152] The gamma calculation module 230 calculates the second set of gamma values ​​based on the first set of gamma values ​​according to the relationship between the first target brightness range and the second target brightness range, specifically including:

[0153] The gamma calculation module 230 uses the mth first gamma value corresponding to the mth grayscale in the first grayscale interval as the nth second gamma value corresponding to the nth grayscale in the second grayscale interval according to the relationship between the first maximum target brightness and the second maximum target brightness, where m is a positive integer less than n.

[0154] The gamma calculation module 230 uses the i-th first gamma value corresponding to the i-th grayscale in the first grayscale interval as the j-th second gamma value corresponding to the j-th grayscale in the second grayscale interval according to the following formula: i=round[(j-1) / (n-1)×(m-1)]+1;

[0155] Among them, round is the rounding function.

[0156] According to some exemplary embodiments, the gamma calculation module 230 is configured to calculate m using the following formula:

[0157] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0158] According to some exemplary embodiments, the gamma debugging module 220 is further used to divide the first grayscale interval into a first sub-grayscale interval and a second sub-grayscale interval, the first sub-grayscale interval includes the 1st grayscale to the xth grayscale, and the second sub-grayscale interval includes the x+1th grayscale to the nth grayscale, where x is an integer greater than or equal to 2 and less than or equal to n-1.

[0159] Continuing with Figure 3 , the gamma adjustment device further includes a lighting module 240, which is electrically connected to the gamma adjustment module 220 and the display device 100. The lighting module 240 is configured to obtain the grayscale value currently being adjusted by the gamma adjustment module 220 and drive the display device 100 to display a preset image based on the grayscale value. For example, if the grayscale value currently being adjusted is 255, the lighting module 240 will cause all sub-pixels within the test image of the display device 100 to display at a grayscale of 255.

[0160] The gamma adjustment module 220 performs gamma adjustment for the multiple target brightnesses in the first target brightness range and the multiple grayscales in the first grayscale range, specifically including:

[0161] The lighting module 240 drives the display device 100 to display in the third display area, and the gamma adjustment module 220 performs gamma adjustment for multiple grayscales in the first sub-grayscale interval; and

[0162] The lighting module 240 drives the display device 100 to display in the fourth display area, and the gamma adjustment module 220 performs gamma adjustment for multiple grayscales in the second sub-grayscale interval.

[0163] The area of ​​the third display region is larger than that of the fourth display region.

[0164] According to some exemplary embodiments, the gamma adjustment module 220 is further configured to calculate x using the following formula:

[0165] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0166] According to some exemplary embodiments, an area of ​​the third display region is equal to an area of ​​the second display region.

[0167] According to some exemplary embodiments, an area of ​​the fourth display region is greater than an area of ​​the first display region.

[0168] According to some exemplary embodiments, an area of ​​the fourth display region is equal to an area of ​​the first display region.

[0169] According to some exemplary embodiments, the lighting module 240 driving the display device 100 to display in the third display area further includes compensating the voltage signal of the third display area using the first voltage drop compensation parameter;

[0170] The lighting module 240 drives the display device 100 to display in the fourth display area and further comprises compensating the voltage signal of the fourth display area using the second voltage drop compensation parameter;

[0171] The first voltage drop compensation parameter is greater than the second voltage drop compensation parameter.

[0172] According to some exemplary embodiments, the lighting module 240 drives the display device 100 to display in the fourth display area, and the gamma adjustment module 220 performs gamma adjustment for multiple grayscales in the second sub-grayscale interval, including at least:

[0173] The lighting module 240 drives the display device 100 to display in the fourth display area and uses the ath second voltage drop compensation parameter to compensate the voltage signal of the fourth display area. The gamma adjustment module 220 performs gamma adjustment for the ath grayscale.

[0174] The lighting module 240 drives the display device 100 to display in the fourth display area and uses the bth second voltage drop compensation parameter to compensate the voltage signal of the fourth display area. The gamma adjustment module 220 performs gamma adjustment for the bth grayscale.

[0175] Wherein, x+1≤a<b≤n, and a and b are both integers, and the a-th second voltage drop compensation parameter is greater than the b-th second voltage drop compensation parameter.

[0176] According to some exemplary embodiments, with continued reference to FIG3 , the gamma debugging device further includes a brightness testing module 250 , which is electrically connected to the gamma debugging module 220 . The brightness testing module 250 is configured to perform a brightness test on the display device 100 during the gamma debugging process and transmit the measured display brightness to the gamma debugging module 220 .

[0177] The gamma adjustment module 220 is further configured to set at least two binding point grayscales within the first grayscale interval, and other grayscales other than the binding point grayscales are non-binding point grayscales;

[0178] The gamma adjustment module 220 performs gamma adjustment on multiple target brightnesses in the first target brightness range and multiple grayscales in the first grayscale range, and obtains a first set of gamma values ​​including:

[0179] The gamma adjustment module 220 performs gamma adjustment for each binding point grayscale to obtain a gamma value so that the difference between the display brightness measured by the brightness test module 250 and the target brightness obtained by the target brightness acquisition module 210 at the binding point grayscale of the display device 100 is less than a preset value;

[0180] The gamma adjustment module 220 calculates the gamma value of each non-binding point grayscale according to the gamma value of each binding point grayscale.

[0181] According to some exemplary embodiments, the gamma debugging module 220 performs gamma debugging on each binding point grayscale to obtain a gamma value, including: the gamma debugging module 220 performs gamma debugging on each binding point grayscale in ascending order of grayscale value.

[0182] According to some exemplary embodiments, the target brightness of the maximum binding point grayscale is less than the upper limit of the test range of the brightness test module 250 .

[0183] According to some exemplary embodiments, the gamma debugging module 220 is further configured to obtain gamma values ​​corresponding to non-binding point grayscales higher than the maximum binding point grayscale by interpolation calculation according to the gamma values ​​corresponding to the binding point grayscales.

[0184] Fig. 4 is a schematic diagram of a gamma adjustment device for another display device according to an embodiment of the present disclosure. Fig. 5 is a schematic diagram of the principle of brightness attenuation achieved by a brightness attenuation module in a gamma adjustment device for a display device according to an embodiment of the present disclosure.

[0185] According to some exemplary embodiments, referring to FIG4 and FIG5 , the gamma debugging device 200 further includes a brightness attenuation module 260, which is located between the light-emitting surface of the display device 100 and the brightness testing module 250. The light emitted by the display device 100 is attenuated by the brightness attenuation module 260 according to a preset brightness attenuation coefficient and then emitted to the brightness testing module 250; wherein the product of the target brightness of the maximum binding point grayscale and the brightness attenuation coefficient is less than the upper limit value of the test range of the brightness testing module 250.

[0186] For example, the brightness attenuation module 260 is a polarizer. The polarizer is arranged parallel to the light-emitting surface of the display device 100, and the polarization direction of the polarizer is set to intersect with the polarization direction of the light emitted by the display device 100, thereby achieving brightness attenuation of the light emitted by the display device 100. The angle between the polarization direction of the polarizer and the polarization direction of the light emitted by the display device 100 is θ, and the theoretical brightness attenuation coefficient is (cosθ) 2 .

[0187] According to some exemplary embodiments, referring to FIG. 3 or FIG. 4 , the gamma debugging device 200 further includes a gamma burning module 270. The gamma burning module 270 is electrically connected to the gamma debugging module 220 and the gamma calculation module 230, respectively, and is configured to obtain a first set of gamma values ​​from the gamma debugging module 220 and a second set of gamma values ​​from the gamma calculation module 230. The gamma burning module 270 is further configured to be electrically connected to the display device 100 and to burn the obtained first set of gamma values ​​and second set of gamma values ​​into a driver chip of the display device 100.

[0188] In another aspect, a display device is provided. The display device includes a display panel and a driver chip bound to the display panel. The driver chip is programmed with a first set of gamma values ​​and a second set of gamma values ​​debugged by the gamma debugging device provided in the aforementioned embodiment.

[0189] The display device has a first display mode and a second display mode. In the first display mode, the display device uses a first display area for display, and in the second display mode, the display device uses a second display area for display. The area of ​​the first display area is smaller than the area of ​​the second display area. When the display device displays in the first display mode, the first set of gamma values ​​obtained by debugging is called, and when the display device displays in the second display mode, the second set of gamma values ​​obtained by debugging is called.

[0190] For example, the first display mode is a highlight mode, and the second display mode is a local highlight mode.

[0191] According to some exemplary embodiments, the display device also includes a third display mode, which is a highlight vivid mode. When the display device displays in the highlight vivid mode, the display area of ​​the display device includes a high-brightness vivid display area, a transition display area and a low-brightness background display area. The transition display area surrounds the high-brightness vivid display area, and the low-brightness background display area surrounds the transition display area.

[0192] When the display device displays in high-brightness and vivid mode, the high-brightness and vivid display area calls the first set of gamma values, the low-brightness background display area calls the second set of gamma values, and the transition display area calls the third set of gamma values. The third set of gamma values ​​is calculated based on the first set of gamma values.

[0193] According to some exemplary embodiments, the step of calculating a third set of gamma values ​​according to the first set of gamma values ​​includes:

[0194] The equivalent display area is calculated based on the image to be displayed in the high-brightness and vivid mode;

[0195] A third set of gamma values ​​is calculated based on the equivalent display area and the first set of gamma values.

[0196] For example, for the third set of gamma values, the kth first gamma value corresponding to the kth grayscale in the first set of gamma values ​​is used as the gamma value corresponding to the 255th grayscale in the third set of gamma values, and k is calculated by the following steps:

[0197] The corresponding gamma value is calculated as follows:

[0198] The equivalent display brightness corresponding to 255 grayscale is calculated according to the following formula:

[0199] Equivalent display brightness = first maximum target brightness - (first maximum target brightness - second maximum target brightness) × (equivalent display area - area of ​​first display area) / (area of ​​second display area - area of ​​first display area);

[0200] Calculate k according to the following formula:

[0201] Among them, round is the rounding function, and the value range of γ is 2.0-2.4.

[0202] As used herein, the terms "substantially," "about," "approximately," and other similar terms are used as terms of approximation rather than as terms of degree, and are intended to account for the inherent deviations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art. To account for factors such as process fluctuations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), "about" or "approximately," as used herein, are inclusive of the stated value and mean within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within ±10% or ±5% of the stated value.

[0203] Although some embodiments according to the general inventive concept of the present disclosure have been illustrated and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A gamma debugging device for a display device, wherein, The display device has a first display mode and a second display mode. The display device uses a first display area for display in the first display mode, and the display device uses a second display area for display in the second display mode. The area of the first display area is smaller than the area of the second display area; The gamma debugging device includes: A target brightness acquisition module, configured to acquire a first target brightness range and a first gray scale range in the first display mode, and a second target brightness range and a second gray scale range in the second display mode. The highest target brightness in the first target brightness range is the first highest target brightness, and the highest target brightness in the second target brightness range is the second highest target brightness. The second highest target brightness is less than the first highest target brightness; A gamma debugging module, configured to perform gamma debugging on multiple target brightnesses in the first target brightness range and multiple gray scales in the first gray scale range to obtain a first set of gamma values. The first set of gamma values includes n gamma values. The n gamma values include the i-th gamma value that maps the i-th brightness in the first brightness range to the i-th gray scale in the first gray scale range. n is a positive integer greater than or equal to 2, and i is a positive integer greater than or equal to 1 and less than or equal to n; and A gamma calculation module, configured to calculate a second set of gamma values based on the first set of gamma values according to the relationship between the first target brightness range and the second target brightness range for multiple target brightnesses in the second target brightness range and multiple gray scales in the second gray scale range; wherein, calculating the second set of gamma values based on the first set of gamma values includes: using the i-th gamma value corresponding to the i-th gray scale in the first gray scale range as the j-th gamma value corresponding to the j-th gray scale in the second gray scale range, where j is a positive integer greater than or equal to 1 and less than or equal to n, and i is not equal to j.

2. The gamma debugging device for a display device according to claim 1, wherein, The maximum gray scale in the second gray scale range is the n-th gray scale; The gamma calculation module calculating the second set of gamma values based on the first set of gamma values according to the relationship between the first target brightness range and the second target brightness range specifically includes: The gamma calculation module, according to the relationship between the first highest target brightness and the second highest target brightness, uses the m-th first gamma value corresponding to the m-th gray scale in the first gray scale range as the n-th second gamma value corresponding to the n-th gray scale in the second gray scale range, where m is a positive integer less than n; The gamma calculation module uses the following formula to use the i-th first gamma value corresponding to the i-th gray scale in the first gray scale range as the j-th second gamma value corresponding to the j-th gray scale in the second gray scale range, i = round[(j - 1) / (n - 1)×(m - 1)] + 1; where, round is a rounding function.

3. The gamma debugging device for a display device according to claim 2, wherein, The gamma calculation module is used to calculate m through the following formula: where, round is a rounding function, and the value range of γ is 2.0 - 2.

4.

4. The gamma debugging device for a display device according to any one of claims 1 - 3, wherein, The gamma debugging module is further configured to divide the first gray scale interval into a first sub - gray scale interval and a second sub - gray scale interval. The first sub - gray scale interval includes the 1st gray scale to the x - th gray scale, and the second sub - gray scale interval includes the (x + 1)-th gray scale to the n - th gray scale, where x is an integer greater than or equal to 2 and less than or equal to n - 1; The gamma debugging device further includes a lighting module, and the lighting module is configured to drive the display device to display a preset picture; The gamma debugging by the gamma debugging module for multiple target brightness levels in the first target brightness interval and multiple gray scale levels in the first gray scale interval specifically includes: The lighting module drives the display device to display in a third display area, and the gamma debugging module performs gamma debugging for multiple gray scale levels in the first sub - gray scale interval respectively; and The lighting module drives the display device to display in a fourth display area, and the gamma debugging module performs gamma debugging for multiple gray scale levels in the second sub - gray scale interval respectively, where the area of the third display area is larger than the area of the fourth display area.

5. The gamma debugging device for a display device according to claim 4, wherein, The gamma debugging module is further configured to calculate x according to the following formula: where round is a rounding function, and the value range of γ is 2.0 - 2.

4.

6. The gamma debugging device for a display device according to claim 4 or 5, wherein, The area of the third display area is equal to the area of the second display area; and / or The area of the fourth display area is greater than or equal to the area of the first display area.

7. The gamma debugging device for a display device according to any one of claims 4 - 6, wherein, The lighting module driving the display device to display in the third display area further includes compensating the voltage signal of the third display area using a first voltage drop compensation parameter; The lighting module driving the display device to display in the fourth display area further includes compensating the voltage signal of the fourth display area using a second voltage drop compensation parameter; where the first voltage drop compensation parameter is greater than the second voltage drop compensation parameter.

8. The gamma debugging device for a display device according to claim 7, wherein, The lighting module drives the display device to display in the fourth display area, and the gamma debugging by the gamma debugging module for multiple gray scale levels in the second sub - gray scale interval at least includes: The lighting module drives the display device to display in the fourth display area and compensates the voltage signal of the fourth display area using the a - th second voltage drop compensation parameter, and the gamma debugging module performs gamma debugging for the a - th gray scale; The lighting module drives the display device to display in the fourth display area and compensates the voltage signal of the fourth display area using the b - th second voltage drop compensation parameter, and the gamma debugging module performs gamma debugging for the b - th gray scale; where x + 1 ≤ a < b ≤ n, and both a and b are integers, and the a - th second voltage drop compensation parameter is greater than the b - th second voltage drop compensation parameter.

9. The gamma debugging device of a display device according to any one of claims 1-8, wherein, The gamma debugging device further includes a brightness testing module, and the brightness testing module is configured to measure the display brightness of the display device; The gamma debugging module is further configured to set at least two tied - point gray scale levels within the first gray scale interval, and the other gray scale levels other than the tied - point gray scale levels are non - tied - point gray scale levels; The gamma debugging module performs gamma debugging on multiple target brightness levels in the first target brightness range and multiple gray levels in the first gray level range, and obtains a first set of gamma values, including: For each of the tied gray levels, the gamma debugging module performs gamma debugging to obtain a gamma value, such that the difference between the display brightness measured by the brightness testing module and the target brightness obtained by the target brightness acquisition module at this tied gray level is less than a preset value; and The gamma debugging module calculates the gamma values of each non-tied gray level based on the gamma values of each tied gray level.

10. The gamma debugging device of a display device according to claim 9, wherein, For each of the tied gray levels, the gamma debugging module performs gamma debugging to obtain a gamma value, including: the gamma debugging module sequentially performs gamma debugging on each of the tied gray levels in ascending order of gray level values.

11. The gamma debugging device of a display device according to claim 9 or 10, wherein, The target brightness of the maximum tied gray level is less than the upper limit of the test range of the brightness testing module.

12. The gamma debugging device of a display device according to claim 11, wherein, The gamma debugging module is further configured to obtain the gamma values corresponding to each non-tied gray level higher than the maximum tied gray level according to the interpolation calculation method based on the gamma values corresponding to each tied gray level.

13. The gamma debugging device of a display device according to claim 9 or 10, wherein, The gamma debugging device further includes a brightness attenuation module, which is located between the light-emitting surface of the display device and the brightness testing module. The light emitted by the display device is attenuated in brightness by the brightness attenuation module according to a preset brightness attenuation coefficient and then projected onto the brightness testing module; Among them, the product of the target brightness of the maximum tied gray level and the brightness attenuation coefficient is less than the upper limit of the test range of the brightness testing module.

14. A gamma debugging method for a display device, wherein, The display device has a first display mode and a second display mode. The display device uses a first display area for display in the first display mode, and the display device uses a second display area for display in the second display mode. The area of the first display area is smaller than the area of the second display area; The gamma debugging method includes the following steps: Obtain a first target brightness range and a first gray level range in the first display mode, and the highest target brightness in the first target brightness range is the first highest target brightness; Perform gamma debugging on multiple first target brightness levels in the first target brightness range and multiple gray levels in the first gray level range to obtain a first set of gamma values. Among them, the first set of gamma values includes n first gamma values, and the n first gamma values include the i-th first gamma value that maps the i-th first target brightness in the mapped first brightness range to the i-th gray level in the first gray level range. n is a positive integer greater than or equal to 2, and i is a positive integer greater than or equal to 1 and less than or equal to n; Obtain a second target brightness range and a second gray level range in the second display mode. The highest target brightness in the second target brightness range is the second highest target brightness, and the second highest target brightness is less than the first highest target brightness; Perform gamma debugging on multiple target brightness levels in the second target brightness range and multiple gray levels in the second gray level range, and calculate a second set of gamma values based on the first set of gamma values according to the relationship between the first target brightness range and the second target brightness range. Among them, calculating the second set of gamma values based on the first set of gamma values includes: Taking the i-th first gamma value corresponding to the i-th gray level in the first gray level interval as the j-th second gamma value corresponding to the j-th gray level in the second gray level interval, where j is a positive integer greater than or equal to 1 and less than or equal to n, and i is not equal to j.

15. The gamma debugging method for a display device according to claim 14, wherein, The maximum gray level in the second gray level interval is the n-th gray level; According to the relationship between the first target brightness interval and the second target brightness interval, calculating the second set of gamma values based on the first set of gamma values includes: According to the relationship between the first highest target brightness and the second highest target brightness, taking the m-th first gamma value corresponding to the m-th gray level in the first gray level interval as the n-th second gamma value corresponding to the n-th gray level in the second gray level interval, where m is a positive integer less than n; Taking the i-th first gamma value corresponding to the i-th gray level in the first gray level interval as the j-th second gamma value corresponding to the j-th gray level in the second gray level interval according to the following formula, i = round[(j - 1) / (n - 1)×(m - 1)] + 1; where round is a rounding function.

16. The gamma debugging method for a display device according to claim 15, wherein, m is calculated by the following formula: where round is a rounding function, and the value range of γ is 2.0 - 2.

4.

17. The gamma debugging method for a display device according to any one of claims 14-16, wherein, The first gray level interval includes a first sub-gray level interval and a second sub-gray level interval. The first sub-gray level interval includes the 1st gray level to the x-th gray level, and the second sub-gray level interval includes the (x + 1)-th gray level to the n-th gray level, where x is an integer greater than or equal to 2 and less than or equal to n - 1; Performing gamma debugging for multiple target brightnesses in the first target brightness interval and multiple gray levels in the first gray level interval includes: Driving the display device to display in a third display area, and performing gamma debugging for multiple gray levels in the first sub-gray level interval respectively; and Driving the display device to display in a fourth display area, and performing gamma debugging for multiple gray levels in the second sub-gray level interval respectively, where the area of the third display area is larger than the area of the fourth display area.

18. The gamma debugging method of the display device according to claim 17, wherein, x is calculated by the following formula: where round is a rounding function, and the value range of γ is 2.0 - 2.

4.

19. A display device, wherein, The display device includes a display panel and a driving chip bound to the display panel. The driving chip is programmed with the first set of gamma values and the second set of gamma values debugged by the gamma debugging device according to any one of claims 1 - 13.

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