TWI705431B - Gamma setting generation method for display panel and gamma device - Google Patents

Abstract

A gamma setting generation method for a display panel is provided to generate N gamma settings, each gamma setting having M gamma nodes. For the gamma setting of the highest target brightness, the gray scale value and gamma voltage code and corresponding brightness value of each gamma node is obtained by measuring the brightness performance of the display panel. Based on the gray scale values and gamma voltage codes and corresponding brightness values of M gamma nodes of the gamma setting of the highest target brightness, all the gray scale values and gamma voltage codes and corresponding brightness values of the gamma setting of the highest target brightness are calculated. For each of the remaining N-1 gamma settings, based on its corresponding target brightness, the brightness value corresponding to the gray scale value of each gamma node is calculated. For each gamma node of each of the remaining N-1 gamma settings, its gamma voltage code is calculated based on the calculated brightness of the gamma node and by referring to all the gray scale values and gamma voltage codes and corresponding brightness values of the gamma setting of the highest target brightness.

Description

Gamma setting generation method and gamma device of display panel

The present invention relates to the technical field of display panels, in particular to a method and a gamma device for generating gamma settings of a display panel.

For the operation of brightness control of existing display panels such as organic light-emitting diodes (OLED), it is necessary to use multiple gamma settings to achieve the effect of linear changes in brightness. Among them, the display panel production line It takes about 1 minute to adjust a group of gamma settings on average, and the time for adjusting multiple gamma settings will double.

Figure 1 shows the process of generating N sets of gamma settings on an existing display panel production line, where each set of gamma settings has M gamma nodes. As shown in the figure, the existing method of generating gamma settings must be specific to each display panel Do gamma and white point and brightness correction, and currently use the search (Auto Search) technology to adjust the gamma setting, and iteratively search for each node of the gamma setting to get the voltage setting that meets the target white point and brightness That is, it is necessary to actually measure the brightness performance of the display panel to obtain the gamma voltage code of the grayscale value of each gamma node. Since the actual measurement of the brightness performance of the display panel is quite time-consuming, a set of gamma For a setting with 30 gamma nodes, it takes an average of 1 minute to adjust the gamma setting of a set of target brightness through the search technology.

And based on the dimming requirements of the display panel, multiple sets of gamma settings with different target brightness are generally required to switch the brightness performance of the display panel. For example, when the gamma setting of the display panel has 8 sets of different target brightness, for one display It takes 8 minutes for the panel to adjust 8 groups of gamma settings. Therefore, in the mass production of display panels, it is assumed that 10,000 display panels need to be produced. Among them, it takes 80,000 minutes to adjust the gamma setting on the production line. This will cause the existing method of generating gamma settings to be difficult to apply to the mass production of display panels.

Therefore, in the design of the generation method of the gamma setting of the conventional display panel, there are still many shortcomings and it is necessary to improve.

The purpose of the present invention is mainly to provide a gamma setting generating method and a gamma device for a display panel. By using one set of gamma settings to calculate and generate all the required gamma settings, the production line can be effectively shortened to adjust multiple sets of gamma. Set the required time to increase the efficiency of mass production of display panels.

According to one feature of the present invention, the present invention provides a method for generating gamma settings of a display panel, which generates N groups of gamma settings, each group of gamma settings corresponding to a target brightness and having M gamma nodes, each gamma node It has a grayscale value and a gamma voltage code, and N and M are integers greater than 1. The method includes the steps: (A) For the gamma setting of the highest target brightness, measure the brightness performance of the display panel to obtain each Gamma voltage code of the gray scale value of a gamma node and a corresponding brightness value; (B) Gamma voltage code of the gray scale value of M gamma nodes and corresponding brightness set according to the gamma of the highest target brightness Calculate the gamma voltage code and the corresponding brightness value of all the grayscale values of the gamma setting of the highest target brightness; (C) For each group of gamma settings of the remaining N-1 groups of gamma settings, according to its corresponding Target brightness to calculate each The brightness value corresponding to the gray scale value of a gamma node; and (D) for each gamma node of each group of gamma settings of the remaining N-1 groups of gamma settings, the gamma node calculated according to step (C) For the brightness value of the node, refer to the gamma voltage code and the corresponding brightness value of all the grayscale values set by the gamma of the highest target brightness, and calculate and generate its gamma voltage code.

According to another feature of the present invention, the present invention provides a gamma device having N groups of gamma settings generated by the aforementioned method for generating gamma settings of the display panel.

The above summary and the following detailed description are exemplary in nature, and are intended to further illustrate the scope of the patent application of the present invention. Other objectives and advantages of the present invention will be described in the following description and drawings.

S201, S203, S205, S207: steps

31: display panel

32: display driver chip

33: Gamma device

N1~N30: Gamma node

Va, Vb, V _T : Gamma voltage code

Ba, Bb, B _T : brightness value

S501, S503, S505, S507: steps

Figure 1 shows the process of generating multiple sets of gamma settings on an existing display panel production line.

FIG. 2 shows the flow of the method for generating the gamma setting of the display panel according to an embodiment of the present invention.

Figure 3 schematically shows an example of N (=8) groups of gamma settings and brightness.

FIG. 4(A) schematically shows the gamma voltage code and the corresponding brightness value of the gray scale values of the M (=30) gamma nodes of the N (=8)th group of gamma settings obtained by measurement.

FIG. 4(B) schematically shows the gamma voltage codes and the corresponding brightness values of all the gray scale values of the N (=8)th group of gamma settings obtained by calculation.

Fig. 4(C) schematically shows the brightness values of M (=30) gamma nodes set by calculating the i (=7) gamma setting.

Fig. 4(D) schematically shows the gamma voltage codes of M (=30) gamma nodes for obtaining the i (=7) gamma setting by calculation.

FIG. 5 shows the flow of a method for generating a gamma setting of a display panel according to another embodiment of the present invention.

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the implementation of the present invention, and are not used to limit the present invention.

FIG. 2 shows the flow of the method for generating gamma settings of a display panel according to an embodiment of the present invention, which is used to generate N groups of gamma settings, where N is an integer greater than 1, and N (=8) groups of gamma in FIG. 3 As shown in the schematic diagram of an example of setting and brightness, N groups of gamma settings are stored in a gamma device 33 for use by a display driver chip 32 for dimming a display panel 31. Each of the display panels 31 A group of gamma settings corresponds to a target brightness. In this embodiment, the first group of gamma settings corresponds to a target brightness of 1, the second group of gamma settings corresponds to a target brightness of 72, and the third group of gamma settings corresponds to The target brightness for the N-1 (=7) group of gamma settings is 144, and the target brightness for the Nth (=8) group of gamma settings is 700, that is, the group N The target brightness corresponding to the gamma setting is incremental. Therefore, the gamma setting of the highest target brightness is the Nth (=8) gamma setting, but this is only an example for convenience of description, and not for limitation.

Fig. 3 also takes the first group of gamma settings as an example to exemplarily display the contents of a group of gamma settings. As known to those skilled in the art, for a display panel supporting p-bit color depth display, each group The gamma setting has M gamma nodes for generating gamma voltage codes with K grayscale values, where M,p are integers greater than 1, K= ^2p , and M<K. In the example shown in Figure 3, p=8 and M=30, that is, the display panel supports 8-bit color depth display, and each set of gamma settings has 30 gamma nodes (N1~N30). To generate 256 grayscale values (0,1,2,3...255) and gamma voltage codes, where a gamma voltage code includes at least one specific color gamma voltage code, which is relevant to the color displayed on the display panel It is an example of a combination of three colors of red (R), green (G) and blue (B). A gamma voltage code includes a red gamma voltage code, a green gamma voltage code and a blue gamma voltage code. Gamma voltage codes, so the gamma voltage codes that can be generated are 256 red gamma voltage codes (RV0, RV1, RV2,...RV255), 256 green gamma voltage codes (GV0, GV1, GV2,... GV255), and 256 blue gamma voltage codes (BV0, BV1, BV2,...BV255).

2 again, in step S201, for the gamma setting of the highest target brightness, the brightness performance of the display panel 31 is measured to obtain the gamma voltage code of the gray scale value of each gamma node and a corresponding For the brightness value, please also refer to the content of the Nth (=8) gamma setting shown in Figure 4(A). For the Nth (=8) gamma setting, the brightness of the display panel is measured Performance to obtain the grayscale value (0,...122,...255) and gamma voltage code (RV0) of its M(=30) gamma nodes (N1,...N15,...N30) /GV0/BV0=0/0/0,...RV122/GV122/BV122=1230/1185/1372,...,RV255/GV255/BV255=1964/1874/2046), and record its corresponding brightness value (B0=0.0006,...B122=138.002,...B255=699.152).

Next, in step S203, according to the gamma voltage codes and the corresponding brightness values of the gray scale values of the M gamma nodes set by the gamma of the highest target brightness, all the gray scale values of the gamma setting of the highest target brightness are calculated Please also refer to the content of the Nth (=8) gamma setting shown in Figure 4(B) for the gamma voltage code and the corresponding brightness value, which is based on the M setting of the Nth (=8) gamma setting. (=30) Gamma voltage codes (VR0/VG0/VB0=) of grayscale values (0,...122,...255) of gamma nodes (N1,...N15,...N30) 0/0/0,...VR122/VG122/VB122=1230/1185/1372,...VR255/VG255/VB255 =1964/1874/2046) and the corresponding brightness value (B0=0.0006,...B122=138.002,...B255=699.152), all K (=256) of the Nth group of gamma settings are calculated by interpolation A gamma voltage code (VR0/VG0/VB0~VR255/VG255/VB255) with a grayscale value (0~255) and the corresponding brightness value (B0~B255).

The method for generating the gamma setting of the display panel of the present invention is based on the gamma voltage code (VR0/VG0/ VB0~VR255/VG255/VB255) and the corresponding brightness value (B0~B255), and calculate the gamma of the remaining N-1 groups of gamma settings (ie, the N-1 group to the first group of gamma settings) The gamma voltage code of the node does not need to measure the brightness performance of the display panel, so as to greatly reduce the time required to adjust the gamma setting.

In step S205, for the i-th group of gamma settings (i=N-1 to 1), the brightness value corresponding to the grayscale value of each gamma node is calculated according to the corresponding target brightness, and the calculation formula represents the first The brightness value corresponding to the gray scale value of each gamma node of the i group of gamma settings is, for example, Brightness _g =Bri _max ×(g/255) ^2.2 , where Bri _max is the target corresponding to the i group of gamma settings Brightness, g represents the grayscale value, and Brightness _g represents the brightness value of the gamma node with the grayscale value g. Refer to Figure 4(C) together, and take the i (=7) group of gamma settings as an example, as shown in Figure 3. As shown, the target brightness corresponding to the seventh group of gamma settings is 430, and the brightness value (B151) of the gamma node (N19) with a grayscale value of 151 can be calculated to be 430×(151/255) ^2.2 = 135.7779798.

Furthermore, in step S207, for each gamma node of the i-th group of gamma settings, according to the brightness value of the gamma node calculated in step S205, refer to all gray values of the Nth group of gamma settings with the highest target brightness. The gamma voltage code (VR0/VG0/VB0~VR255/VG255/VB255) and the corresponding brightness value (B0~B255) of the order value (0~255) are calculated to generate the gamma voltage code. In detail, for a gamma node to be calculated for the i (=7) group gamma setting shown in FIG. 4(C), for example, the gamma node N19 is the value of the gamma node N19 calculated in step S205 The brightness value B151 is compared to the two brightness values Ba, Bb and corresponding ones that are closest to, greater than and less than the brightness value B151 of the gamma node N19 in the Nth (=8) group of gamma settings shown in Figure 4(B) The two gamma voltage codes Va, Vb of the two gamma voltage codes Va, Vb are calculated according to the ratio of the difference in brightness value. The gamma voltage code of each gamma node of the setting is, for example: V _T =Round[Va+(Vb-Va)×((B _T -Ba)/(Bb-Ba))], where V _T is The gamma voltage code of the gamma node to be calculated, Round[] is a round-off function that takes an integer, B _T is the brightness value of the gamma node to be calculated calculated in step S205, and Ba is the Nth group of gamma settings Is the closest and greater than the brightness value of B _T , Bb is the closest and less than the brightness value of B _T in the Nth group of gamma settings, Va is the gamma voltage code corresponding to the brightness value of Ba, and Vb is the brightness corresponding to the brightness A gamma voltage code with a value of Bb. Referring to Figure 4(B) and Figure 4(C) together, take the calculation of the red gamma voltage code of the gamma node (N19) with the gray scale value of the seventh group of gamma setting of 151 as an example, Figure 4(C) The brightness value B151 of the gamma node (N19) in the 7th group of gamma settings shown is 135.7779798. Compared with the brightness value of the Nth (=8) group of gamma settings shown in Figure 4(B), the brightness value of the gamma setting in the Nth (= 8) From the brightness value and gamma voltage code set by the group of gamma, find the two brightness values Ba(B121)=135.276 that are closest to and greater than and less than the brightness value of the gamma node (N19) (B151=135.7779798) Bb(B122)=138.002, and the corresponding two gamma voltage codes Va(VR121)=1225 and Vb(VR122)=1230, and then calculate the red gamma voltage code of the gamma node N19 of the seventh group of gamma settings RV151=V _T =Round[1225+(1230-1225)×((135.7779798-135.276)/(138.002-135.276))]=1226. Similarly, the green gamma voltage code of the gamma node N19 of the seventh group of gamma settings can be calculated as GV151=V _T =Round[1180+(1185-1180)×((135.7779798-135.276)/(138.002-135.276) ))]=1181, and the blue gamma voltage code of the gamma node N19 of the seventh group of gamma settings is calculated as BV151=V _T =Round[1368+(1372-1368)×((135.7779798-135.276)/ (138.002-135.276))]=1369. In this way, the gamma voltage codes of all gamma nodes of the N-1 (=7) group gamma setting can be calculated, as shown in Figure 4(D), so , The present invention can generate the N-1 to the first group of gamma settings completely in a fast calculation manner without the need for time-consuming measurement, effectively shortening the time required to adjust multiple groups of gamma settings.

In the foregoing embodiment of the present invention, the gamma setting of the highest target brightness is first generated by measurement, as a set of reference gamma settings, for reference to this reference gamma setting, and the rest of the gamma settings are generated by calculation However, in another embodiment of the present invention, multiple sets of reference gamma settings can also be used to refer to multiple sets of reference gamma settings at the same time to generate the remaining gamma settings by calculation. Figure 5 shows the present invention The flow of the method for generating gamma settings of a display panel in an embodiment is used to generate N groups of gamma settings, each group of gamma settings has M gamma nodes, where the gamma setting with the highest target brightness is the first N groups of gamma settings, M and N are integers greater than 1. In step S501, for the Nth group of gamma settings of the highest target brightness, the brightness performance of the display panel 31 is measured to obtain the gamma voltage code of the gray scale value of each gamma node and a corresponding brightness value; Furthermore, for at least one i-th group of gamma settings, the brightness performance of the display panel is measured to obtain the gamma voltage code of the gray scale value of each gamma node and a corresponding brightness value, where i is a value between N An integer value from -1 to 1.

In step S503, according to the gamma voltage codes and the corresponding brightness values of the gray scale values of the M gamma nodes of the Nth gamma setting of the highest target brightness, calculate all the gray scales of the gamma setting of the highest target brightness Value of the gamma voltage code and the corresponding brightness value; and the gamma voltage code and the corresponding brightness value of the M gamma nodes set according to the at least one i-th group of gamma According to the corresponding brightness value, the gamma voltage code and the corresponding brightness value of all gray scale values of the i-th group of gamma settings are calculated.

In step S505, for each group of gamma settings except the Nth and ith group of gamma settings, the brightness value corresponding to the grayscale value of each gamma node is calculated according to the corresponding target brightness. In step S507, for each gamma node of each group of gamma settings except the Nth and ith group of gamma settings, the brightness value of the gamma node calculated in step S505 is based on the calculated For the size of the brightness value and the target brightness corresponding to the Nth group of gamma settings and the ith group of gamma settings, refer to the gamma voltage codes and corresponding brightness values of all grayscale values of the Nth group of gamma settings, or refer to the ith The gamma voltage codes and corresponding brightness values of all grayscale values of the group gamma settings are calculated to generate their gamma voltage codes, especially for each group of gamma settings except for the Nth and ith group of gamma settings Each gamma node in is determined according to the size of its grayscale value to refer to the Nth group of gamma settings or the ith group of gamma settings, that is, the gamma node with a larger grayscale value refers to the higher target The Nth group of brightness gamma settings are used to calculate its gamma voltage code. The gamma node with a smaller grayscale value is calculated with reference to the i-th group of gamma settings of lower target brightness to calculate its gamma voltage code to obtain more As a result of accurate calculation, in this embodiment, the i-th group of gamma settings is the first group of gamma settings.

From the above description, it can be seen that the gamma setting generation method and gamma device of the display panel of the present invention can generate most of the gamma settings completely in a fast calculation manner without time-consuming measurement, so the production line can be effectively shortened. Adjust the time required for multiple gamma settings to increase the efficiency of mass production of display panels.

The above-mentioned embodiments are merely examples for the convenience of description, and the scope of rights claimed in the present invention should be subject to the scope of the patent application, rather than limited to the above-mentioned embodiments.

S201, S203, S205, S207: steps

Claims (10)

A method for generating gamma settings of a display panel, generating N groups of gamma settings, each group of gamma settings corresponding to a target brightness and having M gamma nodes, each gamma node having a grayscale value and a gamma voltage Code, N and M are integers greater than 1. The method includes the steps: (A) For the gamma setting of the highest target brightness, the brightness performance of the display panel is measured to obtain the gamma of the gray scale value of each gamma node. A voltage code and a corresponding brightness value, where the gamma setting of the highest target brightness is the group of gamma settings with the highest target brightness among the N groups of gamma settings; (B) the gamma setting based on the highest target brightness Gamma voltage codes and corresponding brightness values of the gray scale values of M gamma nodes, calculate the gamma voltage codes and corresponding brightness values of all gray scale values set by the gamma of the highest target brightness; (C) For the rest For each group of gamma settings of N-1 groups of gamma settings, calculate the brightness value corresponding to the grayscale value of each gamma node according to its corresponding target brightness; and (D) for the remaining N-1 groups of gamma For each gamma node of each set of gamma settings, according to the brightness value of the gamma node calculated in step (C), refer to the gamma voltage code of all grayscale values of the gamma setting of the highest target brightness and The corresponding brightness value is calculated to generate its gamma voltage code. The gamma setting generation method of the display panel as described in the first item of the scope of patent application, wherein, in step (C), the remaining N-1 groups of gamma settings of each group of gamma settings of each gamma node The brightness value corresponding to the gray scale value is: Brightness _g =Bri _max ×(g/255) ^2.2 , where Bri _max is the target brightness corresponding to each gamma setting of the remaining N-1 groups of gamma settings, and g represents gray Brightness _g represents the brightness value of the gamma node with a grayscale value of g. The method for generating the gamma setting of the display panel as described in the first item of the scope of patent application, wherein, in step (D), each gamma node of each gamma setting of the remaining N-1 groups of gamma settings , The brightness value of the gamma node calculated in step (C) is compared with the brightness value set by the gamma of the highest target brightness to find the two brightness values that are closest and greater than and less than the brightness value of the gamma node Value and the corresponding two gamma voltage codes, the gamma voltage codes of the two gamma voltage codes that have been compared are calculated by the inner difference method according to the ratio of the difference in brightness value. The gamma setting generation method of the display panel as described in item 3 of the scope of patent application, wherein, in step (D), the remaining N-1 groups of gamma settings of each group of gamma settings of each gamma node The gamma voltage code is: V _T =Round[Va+(Vb-Va)×(B _T -Ba)/(Bb-Ba)], where Round[] is a rounding function, and B _T is step (C) The calculated brightness value of a gamma node of a group of gamma settings, Ba is the closest brightness value in the Nth group of gamma settings and greater than B _T , and Bb is the closest gamma setting in the highest target brightness And is less than the brightness value of B _T , Va is a gamma voltage code corresponding to the brightness value of Ba, and Vb is a gamma voltage code corresponding to the brightness value of Bb. The method for generating gamma settings of a display panel as described in the first item of the scope of patent application, wherein the display panel supports p-bit color depth display, and the target brightness corresponding to the N groups of gamma settings is incremental, and the gamma of the highest target brightness The Gamma setting is the Nth group of gamma settings. The M gamma nodes of each group of gamma settings generate K grayscale values of gamma voltage codes, where K=2 ^p , p is an integer greater than 1 and M< K. The method for generating the gamma setting of the display panel as described in item 5 of the scope of patent application, wherein, in step (B), the gamma voltage is based on the gray scale values of the M gamma nodes of the Nth group of gamma settings The code and the corresponding brightness value are interpolated to calculate the gamma voltage code and the corresponding brightness value of the K gray scale values of the Nth group of gamma settings. According to the first item of the scope of patent application, the gamma setting generation method of the display panel, wherein a gamma voltage code includes a red gamma voltage code, a green gamma voltage code, and a blue gamma voltage code. The method for generating gamma settings for a display panel as described in the scope of patent application, wherein the gamma setting of the highest target brightness is the Nth group of gamma settings, and step (A) further sets at least one i-th group of gamma settings , To measure the brightness performance of the display panel to obtain the gamma voltage code of the gray scale value of each gamma node and a corresponding brightness value, where i is an integer value between N-1 and 1; step (B ) According to the gamma voltage codes of the gray scale values of the M gamma nodes of the at least one i-th group of gamma settings and the corresponding brightness values, the gamma voltages of all the gray-scale values of the i-th group of gamma settings are calculated Code and the corresponding brightness value; step (C) for each group of gamma settings except the Nth and ith group of gamma settings, calculate the grayscale value corresponding to each gamma node according to its corresponding target brightness The brightness value of; step (D) is to calculate the brightness value of the gamma node according to step (C) for each gamma node of each group of gamma settings except for the Nth and ith group of gamma settings , Based on the calculated brightness value and the target brightness corresponding to the Nth group of gamma settings and the ith group of gamma settings, refer to the gamma voltage codes and corresponding brightness of all grayscale values of the Nth group of gamma settings Value, or refer to the gamma voltage codes and corresponding brightness values of all grayscale values set by the i-th group of gamma, and calculate and generate the gamma voltage codes. The method for generating gamma settings for a display panel as described in item 8 of the scope of patent application, wherein, in step (D), for each group of gamma settings except for the Nth and ith groups of gamma settings The gamma node determines the reference Nth group of gamma settings or the ith group of gamma settings according to the size of its grayscale value. A gamma device having N groups of gamma settings generated by the gamma setting generation method of the display panel described in item 1 of the aforementioned patent application.

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