Gamma tuning method and apparatus thereof, and display apparatus

Abstract

The application relates to the technical field of display, and discloses a gamma debugging method and device and a display device. The gamma debugging method comprises the following steps: a target gamma curve at least comprises a first interval, wherein in the first interval, a gray scale value and a target brightness value are in a linear function relationship; the linear function relationship is acquired; the target gamma curve is generated; and the target gamma curve is burned. The application is beneficial to improving the display effect of a display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a gamma tuning method and apparatus, and a display device. Background Technology

[0002] Gamma calibration is a step in the production process of display modules. Currently, before the display module leaves the factory after the panel structure is manufactured, gamma calibration is required. The purpose is to make the display effect adapt to the non-linear perception characteristics of human eye brightness.

[0003] In the existing technology, display modules are mostly tuned according to a gamma curve with a gamma value of 2.2. However, due to algorithm errors and other reasons, after the display module is tuned based on the gamma curve calculated and fitted by the driver chip, the actual brightness at some gray levels differs greatly from the target brightness, which affects the display effect of the display module. Summary of the Invention

[0004] In view of this, the present invention provides a gamma debugging method and apparatus, and a display device, which are beneficial to improving the display effect of the display panel.

[0005] This invention provides a gamma tuning method, comprising: a target gamma curve including at least a first interval, wherein, in the first interval, the grayscale value and the target brightness value have a linear functional relationship; obtaining the linear functional relationship; generating the target gamma curve; and burning the target gamma curve.

[0006] Based on the same idea, the present invention also provides a gamma debugging device, comprising: an external module electrically connected to a driver chip, the external module including a calculation unit and an output unit; wherein, the calculation unit is used to define a first interval of the target gamma curve, wherein, in the first interval, the grayscale value and the target brightness value have a linear functional relationship; the output unit is used to obtain the linear functional relationship, generate the target gamma curve, and transmit the target gamma curve to the driver chip; the driver chip is used to program the target gamma curve.

[0007] Based on the same idea, the present invention also provides a display device, including the gamma debugging device provided by the present invention.

[0008] Compared with the prior art, the gamma debugging method, apparatus, and display device provided by the present invention achieve at least the following beneficial effects:

[0009] The gamma adjustment method provided by this invention can generate a target gamma curve that is close to a standard gamma curve. Therefore, after the display panel is adjusted based on the target gamma curve, the display effect of the display panel is improved. Specifically, the gamma adjustment method of this invention can define a first interval of the target gamma curve based on the deviation between the actual gamma curve and the standard gamma curve. In the first interval, the deviation between the actual brightness and the required standard brightness is relatively large. Then, a first interval is set in the target gamma curve. In the first interval, the grayscale value and the target brightness value have a linear functional relationship. Therefore, compared with the actual gamma curve, the target gamma curve is closer to the standard gamma curve. This effectively reduces the deviation between the actual brightness of the display panel and the required standard brightness after adjustment based on the target gamma curve, thus effectively improving the display effect of the display panel.

[0010] Of course, any product implementing this invention need not necessarily achieve all of the technical effects described above at the same time.

[0011] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0013] Figure 1 This is a flowchart illustrating a gamma debugging method provided by the present invention;

[0014] Figure 2 This is a schematic diagram of a gamma curve provided by the present invention;

[0015] Figure 3 This is a flowchart illustrating another gamma debugging method provided by the present invention;

[0016] Figure 4 This is a flowchart illustrating another gamma debugging method provided by the present invention;

[0017] Figure 5 This is a schematic diagram of another gamma curve provided by the present invention;

[0018] Figure 6 This is a schematic diagram of another gamma curve provided by the present invention;

[0019] Figure 7 This is a schematic diagram of yet another gamma curve provided by the present invention;

[0020] Figure 8 This is a planar schematic diagram of a display panel provided by the present invention;

[0021] Figure 9 This is a schematic diagram of the structure of a gamma adjustment device provided in an embodiment of the present invention;

[0022] Figure 10 This is a schematic diagram of another gamma adjustment device provided in an embodiment of the present invention;

[0023] Figure 11 This is a plan view of a display device provided by the present invention. Detailed Implementation

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0026] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0027] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0029] The human eye is much more sensitive to brightness in darker environments than to brightness in brighter environments. Therefore, the relationship between human perception and brightness is not linear. For example, doubling the brightness does not necessarily mean the human eye will perceive a doubling; it will only perceive a slight increase. However, when the brightness increases eightfold or more, the human eye will perceive a doubling of the original brightness. Therefore, to ensure that the display effect of a device matches human visual perception, gamma tuning is necessary. Specifically, gamma tuning can be performed on the display device before it leaves the factory to determine the required driving voltage for each grayscale value in each gamma band.

[0030] The display panel has multiple brightness levels. At different brightness levels, the maximum grayscale level corresponds to different brightness. Taking a display panel that supports 256 grayscale levels (0-255) as an example, when the display panel's brightness levels are divided into 10 levels (band0-band9), the brightness corresponding to 255 grayscale levels gradually increases from the first brightness level (band0) to the tenth brightness level (band9). Specifically, the correspondence between grayscale and brightness is expressed by the following formula:

[0031] LvGray i =LvGmax i ×(n / Gmax) γ .

[0032] Among them, LvGray i LvGmax represents the brightness of grayscale n at the i-th brightness level. i Gmax represents the maximum gray level at the i-th brightness level, and γ is a constant. Taking the relationship between brightness and gray level as an example, using a standard gamma curve with a gamma of 2.2, the value of γ is 2.2.

[0033] Currently, due to limitations in the computing power of driver chips, a standard gamma curve is typically calculated and fitted by acquiring a certain number of bound grayscale points. The number of bound grayscale points is far less than the number of grayscale levels that the display panel can display. For example, typically 20 grayscale levels are selected from 0-255 (256 grayscale levels) as bound grayscale points. Due to algorithmic errors and other reasons, the gamma curve fitted by the driver chip based on the bound grayscale points deviates from the standard gamma curve to be fitted. Therefore, after the display panel is adjusted according to the gamma curve fitted based on the bound grayscale points, the actual gamma curve displayed on the display panel will deviate from the standard gamma curve to be generated, affecting the display effect.

[0034] To at least solve the above-mentioned technical problems, embodiments of the present invention provide a gamma debugging method, apparatus, and display device. The gamma debugging method, apparatus, and display device provided by the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 This is a flowchart illustrating a gamma debugging method provided by the present invention. (Refer to...) Figure 1 This embodiment provides a gamma debugging method for performing gamma debugging on display panels before they leave the factory. The gamma debugging method includes:

[0036] Step S1: The target gamma curve includes at least a first interval, wherein the grayscale value and the target brightness value have a linear functional relationship in the first interval.

[0037] In step S1 above, the first interval of the target gamma curve can be defined first, that is, the first interval of the target gamma curve to be formed can be determined first. In the first interval, the gray level value and the target brightness value have a linear functional relationship.

[0038] Step S2: Obtain the linear function relationship.

[0039] In step S2 above, after determining the first interval in the target gamma curve to be formed, the corresponding linear function relationship can be determined based on the relationship between the grayscale value and the target brightness value in the first interval.

[0040] Step S3: Generate the target gamma curve.

[0041] In step S3 above, after obtaining the linear function relationship of the first interval, the target gamma curve is generated based on the linear function relationship of the first interval.

[0042] Step S4: Burn the target gamma curve.

[0043] In step S4 above, the target gamma curve generated in the previous step is burned in, and the display panel is adjusted based on the target gamma curve.

[0044] In existing technologies, after a display panel is adjusted according to a gamma curve calculated and fitted based on bound-point grayscale, the actual gamma curve presented by the display panel deviates from the standard gamma curve to be generated. The gamma adjustment method provided in this invention can generate a target gamma curve that is close to the standard gamma curve. Therefore, adjusting the display panel based on the target gamma curve improves the display effect. Specifically, the gamma adjustment method provided in this invention defines a first interval of the target gamma curve based on the deviation between the actual gamma curve and the standard gamma curve. In this first interval, the deviation between the actual brightness and the required standard brightness is relatively large. Then, a first interval is set within the target gamma curve. In this first interval, the grayscale value and the target brightness value have a linear functional relationship. Therefore, compared to the actual gamma curve, the target gamma curve is closer to the standard gamma curve. This effectively reduces the deviation between the actual brightness of the display panel and the required standard brightness after adjustment based on the target gamma curve, thus effectively improving the display effect.

[0045] For example, refer to Figure 2 , Figure 2 This is a schematic diagram of a gamma curve provided by the present invention. In the grayscale range of 0-40, the actual brightness deviates significantly from the standard brightness to be achieved. The first interval is set within the grayscale range of 0-40. In the grayscale range of 0-40, the grayscale value and the target brightness value have a linear functional relationship. Therefore, the target gamma curve is closer to the standard gamma curve than the actual gamma curve.

[0046] It should be noted that, Figure 2 The example shows a target gamma curve including a first interval, and the first interval is set to a gray level of 0-40. In other embodiments of the present invention, the target gamma curve may include other numbers of first intervals, and the set range of the first interval may be other set ranges, which can be set according to the deviation of the actual gamma curve from the standard gamma curve.

[0047] Figure 3 This is a flowchart illustrating another gamma debugging method provided by the present invention. (Refer to...) Figure 3 In some optional embodiments, the gamma debugging method further includes:

[0048] Step S11: Read the actual gamma curve to obtain the grayscale value and the corresponding actual brightness value.

[0049] In step S11 above, the actual gamma curve presented by the display panel can be read first to obtain the grayscale value and the actual brightness value corresponding to each grayscale value.

[0050] Step S12: Obtain the reference brightness range, which is composed of the area between the first reference gamma curve and the second reference gamma curve.

[0051] In step S12 above, a reference brightness range is obtained based on the first reference gamma curve and the second reference gamma curve, that is, the reference brightness range is the area between the first reference gamma curve and the second reference gamma curve. The standard gamma curve is located within the reference brightness range.

[0052] Step S13: Obtain the first preset range. Within the first preset range, the actual brightness value exceeds the reference brightness range.

[0053] In step S13 above, a first preset interval is obtained based on the actual brightness curve and the reference brightness interval. Within the first preset interval, the actual brightness value exceeds the reference brightness interval. For example, when the brightness value corresponding to the first reference gamma curve is less than the brightness value corresponding to the standard gamma curve at the same grayscale value, and when the brightness value corresponding to the second reference gamma curve is greater than the brightness value corresponding to the standard gamma curve at the same grayscale value, the actual brightness value of each grayscale value is compared with its brightness value based on the first and second reference gamma curves to find at least one first preset interval. That is, it is determined whether the actual brightness value of each grayscale value exceeds the reference brightness interval to find at least one first preset interval. Within the first preset interval, the actual brightness value of each grayscale value is less than its corresponding brightness value based on the first reference gamma curve, or the actual brightness value of each grayscale value is greater than its corresponding brightness value based on the second reference gamma curve.

[0054] Step S14: Obtain a first interval based on a first preset interval. The first interval has two endpoints. The endpoints are located on the actual gamma curve, and the actual brightness values ​​corresponding to the endpoints are located within the reference brightness interval. A linear function relationship is obtained using the grayscale values ​​of the two endpoints and the actual brightness values.

[0055] In step S14 above, a first interval is obtained based on a first preset interval. In the first interval, the grayscale value and the target brightness value have a linear functional relationship. Specifically, the first interval has two endpoints. The endpoints are located on the actual gamma curve, and the actual brightness values ​​corresponding to the endpoints are located within the reference brightness interval. A linear functional relationship is obtained using the grayscale values ​​of the two endpoints and the actual brightness values.

[0056] Specifically, the actual gamma curve displayed on the display panel can be read first to obtain the grayscale values ​​and the corresponding actual brightness values. A reference brightness range is then obtained based on the first and second reference gamma curves; that is, the reference brightness range is the area between the first and second reference gamma curves. The standard gamma curve is located within the reference brightness range. Then, a first preset range can be obtained based on the actual brightness curve and the reference brightness range. Within the first preset range, the actual brightness value exceeds the reference brightness range. That is, within the first preset range, the difference between the actual brightness value corresponding to each grayscale value and its corresponding brightness value based on the standard gamma curve is significant. In other words, within the first preset range, the gamma curve calculated and fitted based on the bound-point grayscale deviates significantly from the standard gamma curve. Therefore, after adjusting the display panel according to the gamma curve calculated and fitted based on the bound-point grayscale, the display effect may be poor.

[0057] A first interval can be obtained based on a first preset interval, in which the grayscale value and the target brightness value have a linear functional relationship. Specifically, the first interval has two endpoints, which are located on the actual gamma curve, and the actual brightness value corresponding to the endpoints is located within the reference brightness interval. A linear functional relationship is obtained using the grayscale values ​​of the two endpoints and the actual brightness value. That is, the target gamma curve contains a first interval set based on the first preset interval, in which the grayscale value and the target brightness value have a linear functional relationship. Therefore, in the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve. Since the first interval is obtained based on the first preset interval, correspondingly, in the first preset interval, the target gamma curve is also closer to the standard gamma curve than the actual gamma curve. Thus, the deviation between the actual brightness of the display panel after adjustment based on the target gamma curve and the required standard brightness is effectively reduced, effectively improving the display effect of the display panel.

[0058] Meanwhile, the first interval has two endpoints, which lie on the actual gamma curve, and the corresponding actual brightness values ​​are within the reference brightness interval. A linear function relationship can be obtained using the grayscale values ​​of the two endpoints and the actual brightness values, thus achieving a first preset interval. Compared to the actual gamma curve, the target gamma curve is closer to the standard gamma curve. There is no need to set more than two number of binding grayscale points within the first preset interval to adjust the target gamma curve, effectively reducing the computational load and power consumption of the driver chip.

[0059] In some optional embodiments, the correspondence between each grayscale value in the first reference gamma curve and its corresponding brightness value satisfies the formula Lv2 / L255=(gray / 255). 2.3 ;

[0060] The correspondence between each grayscale value and its corresponding brightness value in the second reference gamma curve satisfies the formula Lv2 / L255=(gray / 255). 2.1 .

[0061] Specifically, the first reference gamma curve is a gamma curve of gamma 2.3. The correspondence between each gray level value and its corresponding brightness value in the first reference gamma curve satisfies the formula Lv2 / L255=(gray / 255). 2.3 The second reference gamma curve is a gamma curve of gamma 2.1. The correspondence between each gray level value and its corresponding brightness value in the second reference gamma curve satisfies the formula Lv2 / L255=(gray / 255). 2.1 The standard gamma curve of gamma 2.2 lies within a reference brightness interval formed by the region between the first and second reference gamma curves. At this time, within the first preset interval, the actual brightness value of each grayscale value is less than its corresponding brightness value based on the first reference gamma curve, or the actual brightness value of each grayscale value is greater than its corresponding brightness value based on the second reference gamma curve. Within the first preset interval, the difference between the actual brightness value corresponding to each grayscale value and its corresponding brightness value based on the standard gamma curve is significant. Therefore, a first interval can be obtained based on the first preset interval, where the grayscale value and the target brightness value have a linear functional relationship.

[0062] It should be noted that this embodiment exemplarily shows a first reference gamma curve of gamma 2.3 and a second reference gamma curve of gamma 2.1. In other embodiments of the present invention, when the standard gamma curve is a gamma curve of gamma 2.2 or other gamma curves, the first and second reference gamma curves can also be set to other gamma curves based on the adjustment accuracy requirements, as long as the standard gamma curve is located within the reference brightness range formed by the area between the first and second reference gamma curves. The present invention will not elaborate on these points further.

[0063] In some alternative embodiments, the maximum difference in gray levels in the first interval is greater than the maximum difference in gray levels in the first preset interval.

[0064] Specifically, within the first preset interval, there is a significant difference between the actual brightness value corresponding to each grayscale value and its corresponding brightness value based on the standard gamma curve. The two endpoints of the first preset interval exceed the reference brightness interval. By obtaining a first interval based on the first preset interval, the maximum difference in grayscale values ​​within the first interval is greater than the maximum difference in grayscale values ​​within the first preset interval. This ensures that the actual brightness values ​​corresponding to the two endpoints of the first interval are within the reference brightness interval. At this point, the grayscale range corresponding to the first interval includes the grayscale range corresponding to the first preset interval. Within the first interval, the grayscale value and the target brightness value exhibit a linear functional relationship. Therefore, within the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve. Correspondingly, within the first preset interval, the target gamma curve is also closer to the standard gamma curve than the actual gamma curve. This effectively reduces the deviation between the actual brightness of the display panel after adjustment based on the target gamma curve and the required standard brightness, thus effectively improving the display effect of the display panel.

[0065] Figure 4 This is a flowchart illustrating another gamma debugging method provided by the present invention, see reference. Figure 4 In some optional embodiments, the gamma tuning method further includes: step S5, the target gamma curve further includes a second interval, in which the target brightness value is located within the reference brightness interval, and the grayscale value and the target brightness value have a non-linear functional relationship.

[0066] Specifically, in the gamma adjustment method provided in this embodiment of the invention, a first interval of the target gamma curve can be defined based on the deviation between the actual gamma curve and the standard gamma curve. In the first interval, the deviation between the actual brightness and the required standard brightness is relatively large. Then, in the target gamma curve, a first interval is set where the grayscale value and the target brightness value have a linear functional relationship. Therefore, compared to the actual gamma curve, the target gamma curve is closer to the standard gamma curve, effectively reducing the deviation between the actual brightness of the display panel and the required standard brightness after adjustment based on the target gamma curve, thus effectively improving the display effect of the display panel. Simultaneously, a second interval of the target gamma curve can be defined based on the deviation between the actual gamma curve and the standard gamma curve. In the second interval, the target brightness value is located within the reference brightness interval, meaning that in the second interval, the deviation between the actual brightness and the required standard brightness is relatively small. Then, in the target gamma curve, a second interval is set where the grayscale value and the target brightness value have a non-linear functional relationship. In the second interval of the target gamma curve, there is no need to set the grayscale value and the target brightness value to have a linear functional relationship. The gamma curve calculated and fitted based on the bound grayscale can be directly reused, which effectively reduces the amount of calculation of the driver chip and reduces the power consumption of the driver chip.

[0067] Continue to refer to Figure 2 In some alternative embodiments, the nonlinear function relationship conforms to a standard gamma curve;

[0068] For brightness at the same gray level, the standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

[0069] Specifically, the standard gamma curve lies within the reference brightness interval formed by the region between the first and second reference gamma curves. In the second interval, the target brightness value lies within the reference brightness interval, meaning the deviation between the actual brightness and the required standard brightness is small. Furthermore, in the second interval, the gamma curve calculated and fitted based on the bound grayscale is the same as the standard gamma curve. At this point, in the second interval, the nonlinear function relationship can directly reuse the corresponding part of the standard gamma curve, effectively reducing the difficulty of setting the target gamma curve, reducing the computational load on the driver chip, and lowering the power consumption of the driver chip.

[0070] For example, refer to Figure 2 The second interval is set to a grayscale range of 40-80. In the second interval, the actual gamma curve coincides with the standard gamma curve. At this time, in the second interval, the nonlinear function relationship between the grayscale value and the target brightness value conforms to the standard gamma curve.

[0071] In some alternative embodiments, the target gamma curve includes a plurality of first intervals and a plurality of second intervals, at least one first interval and at least one second interval being adjacent to each other, and the first interval and the second interval having a common endpoint.

[0072] The target gamma curve comprises multiple first intervals and multiple second intervals. Adjacent first and second intervals share a common endpoint. When a first interval precedes a second interval, the endpoint of the first interval becomes the starting point of the second interval; conversely, when a first interval follows a second interval, the endpoint of the second interval becomes the starting point of the first interval. In other words, connected first and second intervals in the target gamma curve are linked, resulting in a more natural transition between them and a smoother grayscale transition.

[0073] For example, continue to refer to Figure 2 The first interval is set to a grayscale range of 0-40, and the second interval is set to a grayscale range of 40-80. The first and second intervals have the same endpoints.

[0074] In some alternative embodiments, in the first interval, the target brightness value obtained using a linear function relationship is at least partially located within the reference brightness interval.

[0075] Specifically, a first interval can be obtained based on a first preset interval. In the first interval, the grayscale value and the target brightness value have a linear functional relationship. The first interval has two endpoints, which are located on the actual gamma curve. The actual brightness value corresponding to the endpoint is located within the reference brightness interval. By using the grayscale value and the actual brightness value at the two endpoints to obtain a linear functional relationship, more target brightness values ​​in the first interval are located within the reference brightness interval. This reduces the difference between the brightness value corresponding to each grayscale level in the first interval and the required brightness value, effectively improving the display effect of the display panel.

[0076] In some alternative embodiments, the two endpoints of the first interval are the intersection of the actual gamma curve and the standard gamma curve;

[0077] The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

[0078] Specifically, in the gamma adjustment method provided in this embodiment of the invention, the two endpoints of a first preset interval can be found. The actual gamma curve and the standard gamma curve are searched for intersections from the two endpoints of the first preset interval. When intersections of the actual gamma curve and the standard gamma curve can be found on both sides of the first preset interval, and the grayscale range between the two intersections includes the grayscale range of the first preset interval, the two endpoints of the first interval can be considered intersections of the actual gamma curve and the standard gamma curve. In this case, the endpoints are located on the actual gamma curve, and the actual brightness value corresponding to the endpoints is located within the reference brightness range. A linear function relationship is obtained using the grayscale values ​​of the two endpoints and the actual brightness value.

[0079] For example, continue to refer to Figure 2 The two endpoints of the first interval (the points corresponding to gray levels 0 and 40) are the intersections of the actual gamma curve and the standard gamma curve. At this time, the endpoints are located on the actual gamma curve, and the actual brightness values ​​corresponding to the endpoints are located within the reference brightness range. By using the gray level values ​​and actual brightness values ​​of these two endpoints, a linear function relationship can be obtained, thereby achieving that in the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve.

[0080] In some alternative embodiments, the endpoint of the first interval is the intersection point closest to its corresponding first preset interval.

[0081] Specifically, when there are multiple intersection points between the actual gamma curve and the standard gamma curve, the endpoint of the first interval is the intersection point closest to its corresponding first preset interval. This allows for the determination of the linear functional relationship between the grayscale value and the target brightness value within the first interval. Simultaneously, it helps to reduce the setting range of the first interval and simplifies the setting complexity of the target gamma curve.

[0082] Optionally, the system searches outwards from the two endpoints of the first preset interval to determine if an intersection point exists between the actual gamma curve and the standard gamma curve. When an intersection point is found on one side of the first preset interval, one endpoint of the first interval is considered the intersection point. When no intersection point is found on the other side of the first preset interval, the other endpoint can be the intersection point between the actual gamma curve and either the first or second reference gamma curve. For example, when the first preset interval and the first reference gamma curve are located on the same side of the standard gamma curve, the other endpoint can be the intersection point between the actual gamma curve and the first reference gamma curve; similarly, when the first preset interval and the second reference gamma curve are located on the same side of the standard gamma curve, the other endpoint can be the intersection point between the actual gamma curve and the second reference gamma curve.

[0083] For example, continue to refer to Figure 5 , Figure 5 This is a schematic diagram of another gamma curve provided by the present invention. One endpoint of the first interval (the point corresponding to gray level 45) is the intersection of the actual gamma curve and the standard gamma curve, and one endpoint of the first interval (the point corresponding to gray level 70) is the intersection of the actual gamma curve and the second reference gamma curve. At this time, the endpoint is located on the actual gamma curve. A linear function relationship can be obtained by using the gray level values ​​and the actual brightness values ​​of the two endpoints, so that in the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve.

[0084] In some alternative embodiments, in the first interval, one endpoint is the intersection of the actual gamma curve and the standard gamma curve, and the actual brightness value of the other endpoint is located in the reference brightness interval;

[0085] The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

[0086] Specifically, in the gamma adjustment method provided in this embodiment of the invention, the two endpoints of a first preset interval can be found. The intersection of the actual gamma curve and the standard gamma curve is searched outwards from the two endpoints of the first preset interval. When an intersection of the actual gamma curve and the standard gamma curve is found on one side of the first preset interval, one endpoint of the first interval is considered the intersection of the actual gamma curve and the standard gamma curve. When no intersection of the actual gamma curve and the standard gamma curve can be found on the other side of the first preset interval, the actual brightness value of the other endpoint only needs to be within the reference brightness range. The grayscale range between the two endpoints includes the grayscale range corresponding to the first preset interval. At this time, the endpoint is located on the actual gamma curve, and the actual brightness value corresponding to the endpoint is within the reference brightness range. A linear function relationship can be obtained using the grayscale values ​​of these two endpoints and the actual brightness value.

[0087] For example, continue to refer to Figure 6 , Figure 6 This is a schematic diagram of another gamma curve provided by the present invention. One endpoint of the first interval (the point corresponding to gray level 45) is the intersection of the actual gamma curve and the standard gamma curve. The actual brightness value corresponding to one endpoint of the first interval (the point corresponding to gray level 73) is located in the reference brightness interval. At this time, the endpoint is located on the actual gamma curve. A linear function relationship can be obtained by using the gray level values ​​and the actual brightness values ​​of the two endpoints, thereby realizing that in the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve.

[0088] Furthermore, when the intersection of the actual gamma curve and the standard gamma curve cannot be found on one side of the first preset interval, compared to setting the actual brightness value of the endpoint of the first interval to be in the reference brightness interval when the intersection of the actual gamma curve and the reference gamma curve is taken as the endpoint of the first interval, it is possible to achieve that the target brightness value corresponding to more grayscale values ​​in the first interval is in the reference brightness interval, thereby making the target gamma curve closer to the standard gamma curve in the first interval.

[0089] In some alternative embodiments, in the first interval, one endpoint is the intersection of the actual gamma curve and the standard gamma curve, and the absolute value of the percentage difference between the actual brightness value and the standard brightness value corresponding to the other endpoint is less than a first threshold.

[0090] The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve, and the standard luminance value corresponding to the endpoint is the grayscale value corresponding to the endpoint based on the luminance value of the standard gamma curve.

[0091] Specifically, in the gamma adjustment method provided in this embodiment of the invention, the two endpoints of a first preset interval can be found. The actual gamma curve and the standard gamma curve are searched for intersections from the two endpoints of the first preset interval. When an intersection is found on one side of the first preset interval, one endpoint of the first interval is considered the intersection of the actual gamma curve and the standard gamma curve. When no intersection is found on the other side of the first preset interval, the other endpoint can be found based on the percentage difference between the actual brightness value and the standard brightness value, ensuring that the other endpoint lies on the actual gamma curve and the absolute value of the percentage difference between the actual brightness value and the standard brightness value corresponding to that endpoint is less than a first threshold. The grayscale range between the two endpoints includes the grayscale range corresponding to the first preset interval. At this point, the endpoint lies on the actual gamma curve, and the actual brightness value corresponding to the endpoint lies within the reference brightness range. A linear function relationship is obtained using the grayscale values ​​of the two endpoints and the actual brightness value.

[0092] For example, continue to refer to Figure 6One endpoint of the first interval (the point corresponding to grayscale 45) is the intersection of the actual gamma curve and the standard gamma curve. The other endpoint of the first interval (the point corresponding to grayscale 73) lies on the actual gamma curve. At this point, the difference between the actual brightness value corresponding to grayscale 73 and the standard brightness value is 0.027 nits, and the absolute value of the percentage difference between the actual brightness value corresponding to grayscale 73 and the standard brightness value is 8.44%. The absolute value of the percentage difference between the actual brightness value and the standard brightness value is less than the first threshold. Using the grayscale values ​​and actual brightness values ​​of these two endpoints, a linear function relationship can be obtained, thus achieving a closer approximation of the target gamma curve to the standard gamma curve relative to the actual gamma curve in the first interval. Furthermore, when the intersection of the actual gamma curve and the standard gamma curve cannot be found by tracing from the two endpoints of the first preset interval to one side, the other endpoint of the first interval can be quickly determined, which is beneficial for determining the first interval, reducing the computational load of the driver chip, and lowering the power consumption of the driver chip.

[0093] Optionally, the first threshold is negatively correlated with its corresponding grayscale value. That is, when the endpoint of the first interval is determined based on the absolute value of the percentage difference between its corresponding actual brightness value and the standard brightness value, the first threshold is negatively correlated with the grayscale value corresponding to that endpoint. In other words, the larger the grayscale value corresponding to that endpoint, the smaller the first threshold used for comparison. This ensures that the actual brightness value corresponding to that endpoint is within the reference brightness interval, and also facilitates the search for that endpoint.

[0094] For example, in the grayscale range of 1-11, the corresponding first threshold range is 74.04%-36.94%; in the grayscale range of 12-50, the corresponding first threshold range is 36.94%-17.69%; in the grayscale range of 50-105, the corresponding first threshold range is 17.69%-9.28%; in the grayscale range of 105-200, the corresponding first threshold range is 9.28%-2.41%; and in the grayscale range of 200-255, the corresponding first threshold range is 2.41%-0. It should be noted that this embodiment exemplarily shows the setting range of the first threshold. In other embodiments of the present invention, the first threshold can be set to other ranges according to the debugging accuracy requirements, which will not be elaborated upon here.

[0095] In some alternative embodiments, in the first interval, the absolute value of the percentage difference between the actual brightness value and the standard brightness value corresponding to the two endpoints is less than the first threshold.

[0096] The standard brightness value corresponding to the endpoint is the grayscale value corresponding to the endpoint, which is based on the brightness value of the standard gamma curve. The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

[0097] Specifically, in the gamma adjustment method provided in this embodiment of the invention, the two endpoints of a first preset interval can be found. The intersection of the actual gamma curve and the standard gamma curve is searched outwards from the two endpoints of the first preset interval. When no intersection of the actual gamma curve and the standard gamma curve can be found on either side of the first preset interval, the two endpoints of the first interval can be searched based on the percentage difference between the actual brightness value and the standard brightness value, ensuring that the endpoints are located on the actual gamma curve and the absolute value of the percentage difference between the actual brightness value and the standard brightness value corresponding to the endpoints is less than a first threshold. The grayscale range between the two endpoints includes the grayscale range corresponding to the first preset interval. At this time, the endpoints are located on the actual gamma curve, and the actual brightness value corresponding to the endpoints is within the reference brightness range. A linear function relationship can be obtained using the grayscale values ​​of the two endpoints and the actual brightness value.

[0098] For example, refer to Figure 7 , Figure 7 This is a schematic diagram of another gamma curve provided by the present invention. One endpoint of the first interval (the point corresponding to grayscale 44) is located on the actual gamma curve. At this time, the difference between the actual brightness value corresponding to grayscale 44 and the standard brightness value is 0.006 nit, the absolute value of the percentage difference between the actual brightness value corresponding to grayscale 44 and the standard brightness value is 5.73%, and the absolute value of the percentage difference between the actual brightness value corresponding to grayscale 44 and the standard brightness value is less than the first threshold. The other endpoint of the first interval (the point corresponding to grayscale 71) is also located on the actual gamma curve. At this time, the difference between the actual brightness value corresponding to grayscale 71 and the standard brightness value is 0.0115 nit, the absolute value of the percentage difference between the actual brightness value corresponding to grayscale 71 and the standard brightness value is 3.83%, and the absolute value of the percentage difference between the actual brightness value corresponding to grayscale 71 and the standard brightness value is less than the first threshold. A linear function relationship can be obtained using the grayscale values ​​and actual brightness values ​​of these two endpoints, thereby achieving that in the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve. Furthermore, when the intersection of the actual gamma curve and the standard gamma curve cannot be found from the two endpoints of the first preset interval, the two endpoints of the first interval can be quickly determined, which is beneficial for determining the first interval, reducing the computational load of the driver chip, and reducing the power consumption of the driver chip.

[0099] Optionally, the first threshold is negatively correlated with its corresponding grayscale value. That is, when the endpoint of the first interval is determined based on the absolute value of the percentage difference between its corresponding actual brightness value and the standard brightness value, the first threshold is negatively correlated with the grayscale value corresponding to that endpoint. In other words, the larger the grayscale value corresponding to that endpoint, the smaller the first threshold used for comparison. This ensures that the actual brightness value corresponding to that endpoint is within the reference brightness interval, and also facilitates the search for that endpoint.

[0100] For example, in the grayscale range of 1-11, the corresponding first threshold range is 74.04%-36.94%; in the grayscale range of 12-50, the corresponding first threshold range is 36.94%-17.69%; in the grayscale range of 50-105, the corresponding first threshold range is 17.69%-9.28%; in the grayscale range of 105-200, the corresponding first threshold range is 9.28%-2.41%; and in the grayscale range of 200-255, the corresponding first threshold range is 2.41%-0. It should be noted that this embodiment exemplarily shows the setting range of the first threshold. In other embodiments of the present invention, the first threshold can be set to other ranges according to the debugging accuracy requirements, which will not be elaborated upon here.

[0101] In some alternative embodiments, the endpoints of the first interval include an endpoint, and the actual brightness value corresponding to the endpoint is LV1;

[0102] The actual brightness value corresponding to the next gray level value after the endpoint is LV2;

[0103] Among them, LV2 > LV1.

[0104] Specifically, in the first interval, the grayscale value and the target brightness value have a linear functional relationship. The first interval includes two endpoints. This linear relationship is derived from the grayscale values ​​at these two endpoints and the actual brightness value; that is, in the first interval, the larger the grayscale value, the larger the corresponding actual brightness value. The endpoints of the first interval include the end point, and the actual brightness value corresponding to the end point is LV1, meaning the actual brightness value corresponding to the end point of the first interval is the maximum brightness value among all grayscale values ​​in the first interval. The actual brightness value corresponding to the next grayscale value after the end point is LV2, where LV2 > LV1. This means the actual brightness value corresponding to the end point is less than the actual brightness value corresponding to the next grayscale value after the end point. Therefore, the transition from the end point of the first interval to the next grayscale value is natural and the display effect is good.

[0105] Figure 8 This is a planar schematic diagram of a display panel provided by the present invention. Figure 9 This is a schematic diagram of the structure of a gamma adjustment device provided in an embodiment of the present invention, for reference. Figure 8 and Figure 9 This embodiment provides a gamma adjustment device, which includes an external module 10. The external module 10 is electrically connected to the driver chip 20. The external module 10 includes a calculation unit 11 and an output unit 12.

[0106] The calculation unit 11 is used to define the first interval of the target gamma curve, wherein the gray level value and the target brightness value have a linear functional relationship in the first interval.

[0107] Output unit 12 is used to obtain the linear function relationship, generate the target gamma curve, and transmit the target gamma curve to the driver chip 20;

[0108] The driver chip 20 is used to burn the target gamma curve.

[0109] In existing technologies, after the display panel is adjusted according to the gamma curve calculated and fitted based on the grayscale of the bound points, the actual gamma curve presented by the display panel will deviate from the standard gamma curve that needs to be generated. The gamma adjustment device provided in this embodiment of the invention is disposed in the display panel, and the gamma adjustment device includes an external module 10, which is electrically connected to the driver chip 20, thereby enabling the display panel to be adjusted based on the target gamma curve, which is beneficial to improving the display effect of the display panel. Optionally, the display panel includes a display area AA and a non-display area NA surrounding the display area AA, and the gamma adjustment device is disposed in the non-display area NA.

[0110] Specifically, the gamma adjustment device provided in this embodiment of the invention includes an external module 10, which includes a calculation unit 11 and an output unit 12. The calculation unit 11 is used to define a first interval of the target gamma curve, wherein the grayscale value and the target brightness value have a linear functional relationship in the first interval. The output unit 12 is used to obtain the linear functional relationship, generate the target gamma curve, and transmit the target gamma curve to the driver chip 20. The driver chip 20 is used to program the target gamma curve. This enables the display panel to be adjusted based on the target gamma curve. The target gamma curve generated by the gamma adjustment device provided in this embodiment of the invention is closer to the target gamma curve, thus improving the display effect of the display panel after adjustment based on the target gamma curve.

[0111] Specifically, in the gamma adjustment device provided in this embodiment of the invention, the calculation unit 11 can define a first interval of the target gamma curve based on the deviation between the actual gamma curve and the standard gamma curve. In the first interval, the deviation between the actual brightness and the required standard brightness is relatively large. Then, a first interval is set in the target gamma curve. In the first interval, the grayscale value and the target brightness value have a linear functional relationship. Therefore, the target gamma curve is closer to the standard gamma curve than the actual gamma curve. As a result, the deviation between the actual brightness of the display panel and the required standard brightness after adjustment based on the target gamma curve is effectively reduced, effectively improving the display effect of the display panel.

[0112] Figure 10 This is a schematic diagram of another gamma adjustment device provided in an embodiment of the present invention, for reference. Figure 8 and Figure 10 In some optional embodiments, the add-on module 10 further includes an input unit 13 and a storage unit 14;

[0113] The input unit 13 is used to read the actual gamma curve and obtain the grayscale value and the corresponding actual brightness value.

[0114] Storage unit 14 is used to store the first reference gamma curve and the second reference gamma curve;

[0115] The calculation unit 11 is also used to obtain a reference brightness range, which is composed of the region between the first reference gamma curve and the second reference gamma curve.

[0116] The calculation unit 11 is also used to obtain a first preset interval, in which the actual brightness value exceeds the reference brightness interval;

[0117] The calculation unit 11 is also used to obtain a first interval based on a first preset interval. The first interval has two endpoints, which are located on the actual gamma curve. The actual brightness values ​​corresponding to the two endpoints are located within the reference brightness interval. A linear function relationship is obtained using the grayscale values ​​of the two endpoints and the actual brightness values.

[0118] Specifically, in the gamma adjustment device provided in this embodiment of the invention, the external module 10 further includes a calculation unit 11 and an output unit 12. The input unit 13 is used to read the actual gamma curve to obtain grayscale values ​​and corresponding actual brightness values. That is, the input unit 13 can first read the actual gamma curve presented by the display panel to obtain grayscale values ​​and the actual brightness values ​​corresponding to each grayscale value. The storage unit 14 is used to store the first reference gamma curve and the second reference gamma curve. Thus, the calculation unit 11 can obtain a reference brightness range based on the first and second reference gamma curves, that is, the reference brightness range is the area between the first and second reference gamma curves. The standard gamma curve is located within the reference brightness range. Then, the calculation unit 11 can obtain a first preset range based on the actual brightness curve and the reference brightness range. Within the first preset range, the actual brightness value exceeds the reference brightness range. That is, within the first preset range, the deviation between the gamma curve calculated and fitted based on the bound-point grayscale and the standard gamma curve is large. Therefore, after adjusting the display panel according to the gamma curve calculated and fitted based on the bound-point grayscale, the display effect may be poor.

[0119] The calculation unit 11 can obtain a first interval based on a first preset interval, in which the grayscale value and the target brightness value have a linear functional relationship. Specifically, the first interval has two endpoints, which are located on the actual gamma curve, and the actual brightness value corresponding to the endpoints is located within the reference brightness interval. A linear functional relationship is obtained using the grayscale value of the two endpoints and the actual brightness value. That is, the target gamma curve contains a first interval set based on the first preset interval, in which the grayscale value and the target brightness value have a linear functional relationship. Therefore, in the first interval, the target gamma curve is closer to the standard gamma curve than the actual gamma curve. The first interval is obtained based on the first preset interval, and correspondingly, in the first preset interval, the target gamma curve is also closer to the standard gamma curve than the actual gamma curve. Thus, the deviation between the actual brightness of the display panel after adjustment based on the target gamma curve and the required standard brightness is effectively reduced, effectively improving the display effect of the display panel.

[0120] Meanwhile, the first interval has two endpoints, which lie on the actual gamma curve, and the corresponding actual brightness values ​​are within the reference brightness interval. A linear function relationship can be obtained using the grayscale values ​​of the two endpoints and the actual brightness values, thus achieving a first preset interval. Compared to the actual gamma curve, the target gamma curve is closer to the standard gamma curve. There is no need to set more than two number of binding grayscale points within the first preset interval to adjust the target gamma curve, effectively reducing the computational load and power consumption of the driver chip.

[0121] In some alternative embodiments, please refer to Figure 11 , Figure 11 This is a schematic plan view of a display device provided by the present invention. The display device 1000 provided in this embodiment includes the gamma debugging device provided in the above embodiments of the present invention. It is understood that the display device 1000 provided in the embodiments of the present invention can be a display device 1000 with display function, such as a mobile phone, computer, television, or vehicle display device, and the present invention does not impose specific limitations on it. The display device 1000 provided in the embodiments of the present invention has the beneficial effects of the gamma debugging device provided in the embodiments of the present invention. For details, please refer to the specific description of the gamma debugging device in the above embodiments, which will not be repeated here.

[0122] As can be seen from the above embodiments, the gamma debugging method, apparatus, and display device provided by the present invention achieve at least the following beneficial effects:

[0123] The gamma adjustment method provided by this invention can generate a target gamma curve that is close to a standard gamma curve. Therefore, after the display panel is adjusted based on the target gamma curve, the display effect of the display panel is improved. Specifically, the gamma adjustment method of this invention can define a first interval of the target gamma curve based on the deviation between the actual gamma curve and the standard gamma curve. In the first interval, the deviation between the actual brightness and the required standard brightness is relatively large. Then, a first interval is set in the target gamma curve. In the first interval, the grayscale value and the target brightness value have a linear functional relationship. Therefore, compared with the actual gamma curve, the target gamma curve is closer to the standard gamma curve. This effectively reduces the deviation between the actual brightness of the display panel and the required standard brightness after adjustment based on the target gamma curve, thus effectively improving the display effect of the display panel.

[0124] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A gamma debugging method, characterized in that, include: The target gamma curve includes at least a first interval, wherein the grayscale value and the target brightness value have a linear functional relationship in the first interval; Obtain the linear function relationship; Generate the target gamma curve; The target gamma curve is burned; The target gamma curve includes at least a first interval, wherein the grayscale value and the target brightness value have a linear functional relationship in the first interval, and obtaining the linear functional relationship includes: Read the actual gamma curve to obtain the grayscale value and the corresponding actual brightness value; A reference brightness range is obtained, which is composed of the region between the first reference gamma curve and the second reference gamma curve. Obtain a first preset range, within which the actual brightness value exceeds the reference brightness range; The first interval is obtained based on the first preset interval. The first interval has two endpoints. The endpoints are located on the actual gamma curve. The actual brightness value corresponding to the endpoint is located within the reference brightness interval. The linear function relationship is obtained by using the grayscale value of the two endpoints and the actual brightness value.

2. The gamma debugging method according to claim 1, characterized in that, The maximum difference in gray levels in the first interval is greater than the maximum difference in gray levels in the first preset interval.

3. The gamma debugging method according to claim 1, characterized in that, Also includes: The target gamma curve also includes a second interval, in which the target brightness value is located within the reference brightness interval, and the grayscale value and the target brightness value have a non-linear functional relationship.

4. The gamma debugging method according to claim 3, characterized in that, The nonlinear function relationship conforms to the standard gamma curve; For brightness at the same gray level, the standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

5. The gamma debugging method according to claim 3, characterized in that, The target gamma curve includes multiple first intervals and multiple second intervals, at least one first interval and at least one second interval are adjacent, and the first interval and the second interval have the same endpoint.

6. The gamma debugging method according to claim 1, characterized in that, In the first interval, the target brightness value obtained using the linear function relationship is at least partially located within the reference brightness interval.

7. The gamma debugging method according to claim 1, characterized in that, In the first interval, the two endpoints are the intersections of the actual gamma curve and the standard gamma curve; The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

8. The gamma debugging method according to claim 7, characterized in that, The endpoint of the first interval is the intersection point closest to its corresponding first preset interval.

9. The gamma debugging method according to claim 1, characterized in that, In the first interval, one endpoint is the intersection of the actual gamma curve and the standard gamma curve, and the actual brightness value of the other endpoint is located in the reference brightness interval; The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

10. The gamma debugging method according to claim 1, characterized in that, In the first interval, one endpoint is the intersection of the actual gamma curve and the standard gamma curve, and the absolute value of the percentage difference between the actual brightness value and the standard brightness value corresponding to the other endpoint is less than a first threshold. The standard gamma curve is located between the first reference gamma curve and the second reference gamma curve, and the standard luminance value corresponding to the endpoint is the grayscale value based on the luminance value of the standard gamma curve.

11. The gamma debugging method according to claim 1, characterized in that, In the first interval, the absolute value of the percentage difference between the actual brightness value and the standard brightness value corresponding to the two endpoints is less than the first threshold. Wherein, the standard brightness value corresponding to the endpoint is the brightness value based on the grayscale value corresponding to the endpoint, and the standard gamma curve is located between the first reference gamma curve and the second reference gamma curve.

12. The gamma debugging method according to claim 10 or 11, characterized in that, The first threshold and its corresponding grayscale value are negatively correlated.

13. The gamma debugging method according to claim 1, characterized in that, The endpoints of the first interval include the endpoints, and the actual brightness value corresponding to the endpoints is LV1; The actual brightness value corresponding to the next gray level value of the endpoint is LV2; Among them, LV2 > LV1.

14. The gamma debugging method according to claim 1, characterized in that, The correspondence between each grayscale value and its corresponding brightness value in the first reference gamma curve satisfies the formula Lv2 / L255=(gray / 255). 2.3 ; The correspondence between each grayscale value and its corresponding brightness value in the second reference gamma curve satisfies the formula Lv2 / L255=(gray / 255). 2.1 .

15. A gamma adjustment device, characterized in that, include: An external module, which is electrically connected to a driver chip, includes a computing unit and an output unit. The calculation unit is used to define a first interval of the target gamma curve, wherein the grayscale value and the target brightness value have a linear functional relationship in the first interval. The output unit is used to obtain the linear function relationship, generate the target gamma curve, and transmit the target gamma curve to the driver chip; The driver chip is used to burn the target gamma curve; the external module also includes an input unit and a storage unit. The input unit is used to read the actual gamma curve and obtain the grayscale value and the corresponding actual brightness value. The storage unit is used to store the first reference gamma curve and the second reference gamma curve. The calculation unit is also used to obtain a reference brightness range, which is composed of the region between the first reference gamma curve and the second reference gamma curve. The calculation unit is also used to obtain a first preset interval, in which the actual brightness value exceeds the reference brightness interval; The calculation unit is further configured to obtain the first interval based on the first preset interval. The first interval has two endpoints, the two endpoints are located on the actual gamma curve, and the actual brightness values ​​corresponding to the two endpoints are located within the reference brightness interval. The linear function relationship is obtained by using the grayscale values ​​of the two endpoints and the actual brightness values.

16. A display device, characterized in that, The display device includes the gamma adjustment device as described in claim 15.

Images