Liquid crystal display panel and compensation method thereof

Abstract

The invention discloses a liquid crystal display panel and a compensation method thereof, and the compensation method comprises the steps: firstly obtaining a plurality of continuous and alternate odd frame gray scale data and even frame gray scale data, then determining a minimum gray scale difference, and then determining a gamma voltage difference corresponding to the gray scale difference according to a relation curve of gray scales and gamma voltages. And then a correction value of the common voltage is obtained based on the gamma voltage difference, and the common voltage can be adjusted only once through the correction value, so that the flicker phenomenon can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a liquid crystal display panel and a compensation method thereof. Background Art

[0002] Liquid crystal display panels use AC drive. Since the input signals in the positive and negative half cycles are affected by the feedthrough voltage, the liquid crystal clamping in the positive and negative half cycles is different, resulting in different screen brightness and thus flicker.

[0003] Flicker adjustment is typically performed using a fixed pattern, with the flicker value measured using a corresponding optical instrument. This process typically requires several iterations of "adjusting the common voltage - then measuring the flicker value" to arrive at the desired flicker value. For example, the binary search method used in existing technologies requires approximately eight iterations to achieve the desired flicker value, resulting in multiple iterations required for flicker adjustment. Summary of the Invention

[0004] The present application provides a liquid crystal display panel and a compensation method thereof to alleviate the technical problem that flicker adjustment requires multiple iterations.

[0005] In a first aspect, the present application provides a compensation method for a liquid crystal display panel, which includes a plurality of pixel units distributed in an array, each pixel unit including a plurality of sub-pixels with alternating polarities distributed in a row direction and a column direction, the compensation method including: obtaining a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data, two adjacent pixel units having opposite single polarity in one of the odd-frame grayscale data or the even-frame grayscale data, and the other of the plurality of pixel units displaying a black screen in the odd-frame grayscale data or the even-frame grayscale data; determining the minimum grayscale difference between adjacent pixel units based on one of the odd-frame grayscale data or the even-frame grayscale data; determining the gamma voltage difference corresponding to the grayscale difference based on a relationship curve between grayscale and gamma voltage; and obtaining a correction value of the common voltage based on the gamma voltage difference.

[0006] In some embodiments, each pixel unit includes a plurality of first sub-pixels and second sub-pixels whose polarities are alternately distributed in the row direction and the column direction, and two adjacent pixel units have opposite single polarity in one of the odd frame grayscale data or the even frame grayscale data, including: setting all the first sub-pixels and all the second sub-pixels in one pixel unit to be displayed at zero grayscale and non-zero grayscale, respectively; setting all the first sub-pixels and all the second sub-pixels in another adjacent pixel unit to be displayed at non-zero grayscale and zero grayscale, respectively.

[0007] In some embodiments, displaying a black image in another one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data by the plurality of pixel units includes setting all first sub-pixels and all second sub-pixels in each pixel unit to display at zero grayscale.

[0008] In some embodiments, each pixel unit includes a plurality of first sub-pixels and second sub-pixels whose polarities are alternately distributed in the row direction and the column direction, including: arranging the first sub-pixels and the second sub-pixels to be alternately distributed in the row direction and the column direction; configuring one of the first sub-pixels or the second sub-pixels to have a positive polarity and the other of the first sub-pixel or the second sub-pixel to have a negative polarity.

[0009] In some embodiments, the step of determining the minimum grayscale difference between adjacent pixel units based on one of the odd frame grayscale data or the even frame grayscale data includes: obtaining the grayscale of each pixel unit based on one of the odd frame grayscale data or the even frame grayscale data; obtaining the grayscale difference between adjacent pixel units according to the grayscale of each pixel unit; and determining the minimum grayscale difference from the grayscale differences between the adjacent pixel units.

[0010] In some embodiments, the step of determining the gamma voltage difference corresponding to the grayscale difference according to the relationship curve between the grayscale and the gamma voltage includes: setting the gamma voltage to be divided into a positive half-cycle gamma voltage and a negative half-cycle gamma voltage; setting the common voltage to be greater than the negative half-cycle gamma voltage and less than the positive half-cycle gamma voltage; and determining the gamma voltage difference as shown in formula (1-1):

[0011] deltagammaV=(V0-V6)*ΔV / 255 (1-1)

[0012] Wherein, deltagammaV is the gamma voltage difference, V0 is the maximum value of the gamma voltage in the positive half cycle, V6 is the minimum value of the gamma voltage in the positive half cycle, and ΔV is the minimum grayscale difference.

[0013] In some embodiments, the step of obtaining the correction value of the common voltage based on the gamma voltage difference includes: determining half of the gamma voltage difference as the correction value.

[0014] In some embodiments, after the step of obtaining a correction value of the common voltage based on the gamma voltage difference, the method further includes: superimposing the correction value to the initial common voltage to obtain a target common voltage; and controlling the twisting of the liquid crystal based on the target common voltage, the positive half-cycle gamma voltage, and the negative half-cycle gamma voltage.

[0015] In some embodiments, each pixel unit includes at least 9 sub-pixels distributed in an array, and the at least 9 sub-pixels have three different colors.

[0016] In a second aspect, the present application provides a liquid crystal display panel, which implements the compensation method in at least one of the above-mentioned embodiments.

[0017] The liquid crystal display panel and compensation method provided by the present application first obtain a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data, two adjacent pixel units have opposite single polarity in one of the odd-frame grayscale data or the even-frame grayscale data, and the multiple pixel units display a black screen in the other of the odd-frame grayscale data or the even-frame grayscale data, and then determine the minimum grayscale difference between adjacent pixel units based on one of the odd-frame grayscale data or the even-frame grayscale data, and then determine the gamma voltage difference corresponding to the grayscale difference based on the relationship curve between grayscale and gamma voltage, and then obtain a correction value of the common voltage based on the gamma voltage difference. The flicker phenomenon can be improved by adjusting the common voltage only once through the correction value, without the need for multiple iterations with lower efficiency.

[0018] Furthermore, flicker can also be improved by using a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data such as dynamic images. Compared with flicker which is usually adjusted under a fixed pattern, this expands the types of patterns required for flicker adjustment.

[0019] In addition, a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data can be obtained by taking a single shot with the camera, and the corresponding grayscale difference can be identified based on the odd-frame grayscale data and the even-frame grayscale data as a basis for judging the size of the flicker value. Compared with the existing method of measuring the flicker value through the corresponding optical instrument, the frequency of use of the optical instrument is reduced, thereby improving the efficiency of flicker adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0021] Figure 1 Schematic diagram of the relationship between common voltage, gamma voltage and brightness in related technology.

[0022] Figure 2 Schematic diagram of the structure of a fixed pattern used to adjust flicker in the related art.

[0023] Figure 3 This is another structural diagram of a fixed pattern used to adjust flicker in the related art.

[0024] Figure 4 Schematic diagram of calculating the flicker value using an optical instrument in the related art.

[0025] Figure 5 A flowchart of the compensation method provided in an embodiment of the present application.

[0026] Figure 6 A schematic diagram of frame grayscale data provided in an embodiment of the present application.

[0027] Figure 7 A schematic diagram of the distribution of pixel units provided in an embodiment of the present application.

[0028] Figure 8 A schematic structural diagram of a pixel unit provided in an embodiment of the present application.

[0029] Figure 9 Another structural schematic diagram of a pixel unit provided in an embodiment of the present application.

[0030] Figure 10 A schematic diagram of obtaining grayscale by taking a photo provided in an embodiment of the present application.

[0031] Figure 11 A schematic diagram of the original relationship curve between gamma voltage and grayscale provided in an embodiment of the present application.

[0032] Figure 12 A schematic diagram of grayscale compensation provided in an embodiment of the present application.

[0033] Figure 13 A schematic diagram of grayscale difference provided in an embodiment of the present application.

[0034] Figure 14 This is a schematic diagram of the first effect of grayscale difference provided in an embodiment of the present application.

[0035] Figure 15 This is a schematic diagram of the second effect of grayscale difference provided in an embodiment of the present application.

[0036] Figure 16 A simplified diagram of the relationship between gamma voltage and grayscale provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. The features specified as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] Since the LCD panel uses AC drive, the input signal of the positive and negative half cycles will be affected by the feedthrough voltage, resulting in different liquid crystal clamping pressure in the positive and negative half cycles, resulting in different screen brightness, thus causing flicker.

[0040] Therefore, using Figure 1 The center-left figure shows how flicker is reduced by adjusting the common voltage (VCOM) to balance the LCD clamping during the positive and negative half-cycles. The LCD clamping during the positive half-cycle is (gammaV+)-VCOM. The LCD clamping during the negative half-cycle is VCOM-(gammaV-). gammaV+ is the gamma voltage for the positive half-cycle, and gammaV- is the gamma voltage for the negative half-cycle.

[0041] The adjustment of the flicker value is actually to find a common voltage to minimize the flicker value (the valley of the curve), such as Figure 1 As shown in the middle right figure, specifically, as the common voltage increases, the luminance difference (Max lux - Min lux) changes from the initial maximum luminance difference to the minimum luminance difference, and then back to the maximum luminance difference. The trough of the curve corresponds to the minimum luminance difference. At this point, the corresponding common voltage can make the liquid crystal clamping pressure of the positive and negative half-cycles approximately or equal, thereby reducing the flicker value.

[0042] The flicker value is usually adjusted in Figure 2 This is accomplished using a fixed flicker pattern, which is determined by the driving architecture of the liquid crystal display panel. Figure 2 The pattern shown displays positive polarity in frame N and negative polarity in frame N+1. The flicker value is calculated by measuring the brightness difference between frames N and N+1. It's understood that a smaller flicker value is better. This means the brightness difference between frames N and N+1 needs to be as small as possible to improve the display quality.

[0043] Figure 3 The sub-pixel arrangement shown is another fixed pattern for adjusting the flicker value. Figure 2 compared to, Figure 3 The display color (RGB) of each sub-pixel can be ignored. Each square represents a sub-pixel.

[0044] The flicker value is measured using a CA310 camera or other optical instruments that support flicker value measurement. Figure 4 Taking the CA310 camera as an example, the calculation method of the flicker value is as follows:

[0045] flicker=(max-min) / ((max+min) / 2)*100%

[0046] Among them, flicker is the flicker value, max is the maximum brightness, and min is the minimum brightness.

[0047] However, using the above method, the minimum flicker value cannot be achieved by adjusting the common voltage once. This process usually requires several iterations of "adjusting the common voltage and then measuring the flicker value." The currently used binary search method requires about eight iterations to achieve a minimum flicker value.

[0048] Therefore, in view of the technical problem that the adjustment of the flicker value mentioned above requires multiple iterations, this embodiment provides a liquid crystal display panel, see Figures 5 to 16 The liquid crystal display panel includes a plurality of pixel units distributed in an array, and each pixel unit includes a plurality of sub-pixels with alternating polarities distributed in a row direction and a column direction.

[0049] like Figure 5 As shown, the compensation method of the liquid crystal display panel includes the following steps:

[0050] Step S10: Acquire a plurality of continuous and alternating odd-numbered frame grayscale data and even-numbered frame grayscale data, wherein two adjacent pixel units have opposite single polarity in one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data, and the plurality of pixel units display a black screen in the other of the odd-numbered frame grayscale data or the even-numbered frame grayscale data.

[0051] Step S20 : ​​determining a minimum grayscale difference between adjacent pixel units based on either the odd-numbered frame grayscale data or the even-numbered frame grayscale data.

[0052] Step S30: determining the gamma voltage difference corresponding to the grayscale difference according to the relationship curve between the grayscale and the gamma voltage.

[0053] Step S40: obtaining a correction value of the common voltage based on the gamma voltage difference.

[0054] It can be understood that the compensation method provided in this embodiment first obtains multiple continuous and alternating odd frame grayscale data and even frame grayscale data, two adjacent pixel units have opposite single polarity in one of the odd frame grayscale data or the even frame grayscale data, and multiple pixel units display a black screen in the other of the odd frame grayscale data or the even frame grayscale data, and then determines the minimum grayscale difference between adjacent pixel units based on one of the odd frame grayscale data or the even frame grayscale data, and then determines the gamma voltage difference corresponding to the grayscale difference according to the relationship curve between grayscale and gamma voltage, and then obtains the correction value of the common voltage based on the gamma voltage difference. The flicker phenomenon can be improved by adjusting the common voltage only once through the correction value, without the need for multiple iterations with lower efficiency.

[0055] Furthermore, flicker can also be improved by using a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data such as dynamic images. Compared with flicker which is usually adjusted under a fixed pattern, this expands the types of patterns required for flicker adjustment.

[0056] In addition, a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data can be obtained by taking a single shot with the camera, and the corresponding grayscale difference can be identified based on the odd-frame grayscale data and the even-frame grayscale data as a basis for judging the size of the flicker value. Compared with the existing method of measuring the flicker value through the corresponding optical instrument, the frequency of use of the optical instrument is reduced, thereby improving the efficiency of flicker adjustment.

[0057] It should be noted that this embodiment can reduce the flicker value by adjusting the common voltage only once, without the need for multiple iterations with lower efficiency. This improves the adjustment efficiency and is beneficial to increasing the production capacity of the liquid crystal display panel per unit time.

[0058] Among them, a plurality of continuous and alternating odd-numbered frame grayscale data and even-numbered frame grayscale data, such as Figure 6 As shown, the first frame may be odd-numbered frame grayscale data, the second frame may be even-numbered frame grayscale data, the third frame may be odd-numbered frame grayscale data, the fourth frame may be even-numbered frame grayscale data, and so on.

[0059] Figure 6 Taking the example of two adjacent pixel units having opposite single polarities in odd-numbered frame grayscale data and multiple pixel units displaying a black image in even-numbered frame grayscale data as an example, in other embodiments, two adjacent pixel units having opposite single polarities in even-numbered frame grayscale data and multiple pixel units displaying a black image in odd-numbered frame grayscale data as an example.

[0060] Among them, the multiple pixel units distributed in the array can be as follows Figure 7As shown, the middle area or the center area of ​​the liquid crystal display panel can improve the flicker through fewer pixel units instead of all sub-pixels, thereby reducing the amount of data processing.

[0061] exist Figure 7 In the figure, A represents a pixel unit displaying one polarity, and B represents a pixel unit displaying the other polarity. One polarity can be either positive or negative, and the other polarity can be the other of the two. For example, when one polarity is positive, the other polarity is negative; or, when one polarity is negative, the other polarity is positive.

[0062] from Figure 7 It can be seen that these pixel units are arranged in an ABAB manner along the row direction and in an ABA manner along the column direction.

[0063] Specifically, Figure 8 、 Figure 9 The specific structure of the pixel unit is shown. It can be seen that each pixel unit includes multiple first sub-pixels and second sub-pixels with alternating polarity in the row direction and column direction. The row direction and column direction include the row direction and the column direction. For example, in the pixel units shown in A, B, and C, the first and third rows alternate with negative polarity (-) and positive polarity (+); the second and fourth rows alternate with positive polarity (+) and negative polarity (-).

[0064] It should be noted that the pixel units shown in A and B are illustrated using 4*4 sub-pixels as an example, and may also include other numbers of sub-pixels distributed in an array. For example, to achieve spatial mixed-color display, each pixel unit may include at least 9 sub-pixels distributed in an array, with at least 9 sub-pixels having three different colors.

[0065] exist Figure 8 In the figure, the negative sub-pixel is used as the first sub-pixel, and the positive sub-pixel is used as the second sub-pixel. All the first sub-pixels in the pixel unit shown in A are displayed at zero grayscale, and all the second sub-pixels are displayed at non-zero grayscale. Since the brightness of the sub-pixels displayed at zero grayscale is very low (about 0.3nit), it is difficult for the human eye to recognize the polarity of the sub-pixels displayed at zero grayscale in this case. Therefore, the pixel unit shown in A has a single polarity, namely positive polarity.

[0066] Similarly, in the pixel unit shown in B adjacent to the pixel unit shown in A, all first sub-pixels are displayed at non-zero grayscale, and all second sub-pixels are displayed at zero grayscale. Since the brightness of the sub-pixels displayed at zero grayscale is very low (approximately 0.3 nit), it is difficult for the human eye to identify the polarity of the sub-pixels displayed at zero grayscale in this case. Therefore, the pixel unit shown in B has a single polarity, namely negative polarity.

[0067] It is understandable that in other embodiments, the polarity of the pixel unit shown in A and the polarity of the pixel unit shown in B may also be swapped.

[0068] exist Figure 9 In the case where all first sub-pixels and all second sub-pixels in the central area of ​​the liquid crystal display panel are displayed at zero grayscale, multiple pixel units can also display a black screen or a completely black screen. The pixel unit shown in C can be understood as the sum of the pixel unit shown in A and the pixel unit shown in B.

[0069] like Figure 10 As shown, the grayscale and corresponding brightness of the pixel unit shown in A and the pixel unit shown in B can be obtained by taking pictures, and since the pixel unit shown in A and the pixel unit shown in B display different polarities, if there is a brightness difference between the pixel unit shown in A and the pixel unit shown in B, a dividing line will be seen at the junction of the pixel unit shown in A and the pixel unit shown in B in the photo.

[0070] Among them, by controlling the shutter time of the camera, it is possible to obtain multiple frames of grayscale in one photo. For example, the refresh frequency of the LCD panel is 60hz, which means 60 frames per second. The shutter time is set to 1 second, so that the camera's photosensitive chip is continuously sensitive to light (this process is similar to integration), and the brightness of these 60 frames can be achieved.

[0071] From some frames, the grayscale of the pixel unit shown in A and the grayscale of the pixel unit shown in B can be obtained simultaneously, and then the brightness corresponding to the grayscale can be obtained; while from other frames, the grayscale of the pixel unit shown in C can be obtained, and the corresponding grayscale is displayed as a black screen.

[0072] The relationship curve between grayscale and gamma voltage is as follows: Figure 11 As shown in the figure, the horizontal axis represents grayscale, for example, 00H-FFH represents grayscale 0-255; the vertical axis represents gamma voltage, which is divided into a positive half-cycle gamma voltage (gammaV+) for displaying positive polarity and a negative half-cycle gamma voltage (gammaV-) for displaying negative polarity. Among them, the common voltage (VCOM) is greater than the negative half-cycle gamma voltage (gammaV-) and less than the positive half-cycle gamma voltage (gammaV+).

[0073] exist Figure 12The three large squares from left to right show Figure 7 The pixel units arranged in an array in the central area shown in Figure 7 The array layout in the upper right corner shows pixel units A and B. In the first large square from left to right, X represents grayscale compensation, where "+" indicates increasing grayscale compensation and "-" indicates decreasing grayscale compensation. The numbers represent the specific grayscale compensation values. Y represents the target grayscale corresponding to each pixel unit. Z is the sum of X and Y.

[0074] For example, for the pixel unit in the first row and first column of each block, its target grayscale is 128 and its grayscale compensation is +4, then its compensated grayscale is Z = X + Y = 128 + 4 = 132. For the pixel unit in the first row and second column of each block, its target grayscale is 128 and its grayscale compensation is -1, then its compensated grayscale is Z = X + Y = 128 - 1 = 127. Other examples can be deduced accordingly and will not be detailed here.

[0075] The target grayscale can be any value in the grayscale range of 0-255, which can optimize the flicker corresponding to the target grayscale.

[0076] in, Figure 12 The numerical values ​​shown in the figures are for example only and are not intended to be limiting.

[0077] exist Figure 13 In the figure, the head and tail of each arrow represent two pixel units that can be compared in brightness. Since different pixel units are assigned different grayscales, the grayscale difference between adjacent pixel units is obtained based on the grayscale of each pixel unit. The minimum grayscale difference is then determined from the grayscale differences between adjacent pixel units. The two pixel units with the smallest brightness difference can then be found based on this minimum grayscale difference.

[0078] The brightness difference between adjacent pixel units due to the positive and negative polarity, as well as the grayscale difference of the adjustment, form several boundaries. Figure 13 The arrow shown spans the junction between two pixel cells.

[0079] It is understandable that the grayscale of each pixel unit can be obtained from the corresponding frame grayscale data.

[0080] It should be noted that the above boundaries can be used to determine whether there is distortion in camera photos: Figure 14As shown, the grayscale difference between the grayscale compensation (-1) of the pixel unit shown in the second column of the first row and the grayscale compensation (+3) of the pixel unit shown in the third column, and the grayscale difference between the grayscale compensation (-3) of the pixel unit shown in the second column of the third row and the grayscale compensation (+1) of the pixel unit shown in the third column can be considered to be equal.

[0081] The grayscale difference between the grayscale compensation (-2) of the pixel unit shown in the first column of the second row and the grayscale compensation (+0) of the pixel unit shown in the second column, and the grayscale difference between the grayscale compensation (-0) of the pixel unit shown in the third column of the second row and the grayscale compensation (+2) of the pixel unit shown in the fourth column can be considered equal.

[0082] The grayscale difference between the grayscale compensation (-1) of the pixel unit shown in the first row of the second column and the grayscale compensation (+0) of the pixel unit shown in the second row, and the grayscale difference between the grayscale compensation (+1) of the pixel unit shown in the third row of the third column and the grayscale compensation (-0) of the pixel unit shown in the second row can be considered equal.

[0083] The grayscale difference between the grayscale compensation (+3) of the pixel unit shown in the first row of the third column and the grayscale compensation (-0) of the pixel unit shown in the second row, and the grayscale difference between the grayscale compensation (-3) of the pixel unit shown in the third row of the second column and the grayscale compensation (+0) of the pixel unit shown in the second row can be considered equal.

[0084] For the two pixel units with the same grayscale difference, the edge gradient values ​​are theoretically also equal, and the camera takes pictures without distortion; otherwise, distortion occurs.

[0085] When at least one of the grayscale differences exceeds a threshold, for example, grayscale 1-2, it indicates that there is distortion in the camera image.

[0086] The grayscale difference refers to the grayscale compensation of the “+” pixel unit minus the grayscale compensation of the “-” pixel unit. For example, the grayscale difference between the grayscale compensation (-2) of the pixel unit shown in the first column of the second row and the grayscale compensation (+0) of the pixel unit shown in the second column is (+0)-(-2)=2; the grayscale difference between the grayscale compensation (-0) of the pixel unit shown in the third column of the second row and the grayscale compensation (+2) of the pixel unit shown in the fourth column is (+2)-(-0)=2.

[0087] like Figure 15 As shown, Figure 14 The difference is that the double arrow is changed to a single arrow. Figure 15The single arrows shown represent the process of obtaining the grayscale difference, i.e., the grayscale compensation of the pixel unit at the end of the single arrow is subtracted from the grayscale compensation of the pixel unit at the head of the single arrow. This demarcation can also be used to determine the minimum edge gradient value (indicating the minimum brightness difference and the minimum flicker value) to obtain the minimum grayscale difference, and based on this minimum grayscale difference, the optimal correction value for the common voltage is obtained without the need for multiple iterations.

[0088] The edge gradient value may be a grayscale difference value or a grayscale difference.

[0089] For the convenience of calculation and explanation, Figure 11 The relationship curve in is changed to Figure 16 The straight line shown is based on Figure 16 The gamma voltage difference can be determined as shown in formula (1-1):

[0090] deltagammaV=(V0-V6)*ΔV / 255 (1-1)

[0091] Wherein, deltagammaV is the gamma voltage difference, V0 is the maximum value of the gamma voltage in the positive half cycle, V6 is the minimum value of the gamma voltage in the positive half cycle, and ΔV is the minimum grayscale difference.

[0092] Then, a correction value for the common voltage is determined to be half the gamma voltage difference. This correction value is then added to the initial common voltage to obtain a target common voltage. The target common voltage and the positive half-cycle gamma voltage are used to control the twist of the liquid crystal in the positive half-cycle, while the target common voltage and the negative half-cycle gamma voltage are used to control the twist of the liquid crystal in the negative half-cycle, thereby reducing the brightness difference between the positive and negative half-cycles and, in turn, the flicker value.

[0093] In one embodiment, the present embodiment provides a liquid crystal display panel, which performs the compensation method of at least one of the above embodiments.

[0094] It can be understood that since the liquid crystal display panel provided by this embodiment implements the compensation method of at least one of the above-mentioned embodiments, it can also obtain a plurality of continuous and alternating odd frame grayscale data and even frame grayscale data first, and two adjacent pixel units have opposite single polarity in one of the odd frame grayscale data or the even frame grayscale data, and the plurality of pixel units display a black screen in the other of the odd frame grayscale data or the even frame grayscale data, and then determine the minimum grayscale difference between adjacent pixel units based on one of the odd frame grayscale data or the even frame grayscale data, and then determine the gamma voltage difference corresponding to the grayscale difference according to the relationship curve between grayscale and gamma voltage, and then obtain the correction value of the common voltage based on the gamma voltage difference. The flicker phenomenon can be improved by adjusting the common voltage only once through the correction value, without the need for multiple iterations with lower efficiency.

[0095] Furthermore, flicker can also be improved by using a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data such as dynamic images. Compared with flicker which is usually adjusted under a fixed pattern, this expands the types of patterns required for flicker adjustment.

[0096] In addition, a plurality of continuous and alternating odd-frame grayscale data and even-frame grayscale data can be obtained by taking a single shot with the camera, and the corresponding grayscale difference can be identified based on the odd-frame grayscale data and the even-frame grayscale data as a basis for judging the size of the flicker value. Compared with the existing method of measuring the flicker value through the corresponding optical instrument, the frequency of use of the optical instrument is reduced, thereby improving the efficiency of flicker adjustment.

[0097] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] The above is a detailed introduction to the liquid crystal display panel and compensation method provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A compensation method for a liquid crystal display panel, characterized in that: The liquid crystal display panel includes a plurality of pixel units distributed in an array, each pixel unit includes a plurality of sub-pixels with polarities alternately distributed in a row direction and a column direction, and the compensation method includes: Acquire a plurality of continuous and alternating odd-numbered frame grayscale data and even-numbered frame grayscale data, wherein two adjacent pixel units have opposite single polarity in one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data, and the other of the plurality of pixel units in the odd-numbered frame grayscale data or the even-numbered frame grayscale data displays a black picture; Determine a minimum grayscale difference between adjacent pixel units based on one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data; Determining the gamma voltage difference corresponding to the grayscale difference according to a relationship curve between grayscale and gamma voltage; A correction value of the common voltage is obtained based on the gamma voltage difference.

2. The compensation method according to claim 1, characterized in that: Each pixel unit includes a plurality of first sub-pixels and second sub-pixels with polarities alternately distributed in the row direction and the column direction, and the two adjacent pixel units have opposite single polarities in one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data, including: Setting all first sub-pixels and all second sub-pixels in a pixel unit to be displayed at zero grayscale and non-zero grayscale respectively; All first sub-pixels and all second sub-pixels in another adjacent pixel unit are set to display at non-zero grayscale and zero grayscale respectively.

3. The compensation method according to claim 2, characterized in that: The other of the plurality of pixel units displays a black picture in the odd-numbered frame grayscale data or the even-numbered frame grayscale data, including: All first sub-pixels and all second sub-pixels in each pixel unit are set to display at zero grayscale.

4. The compensation method according to claim 2, characterized in that: Each pixel unit includes a plurality of first sub-pixels and second sub-pixels with polarities alternately distributed in the row direction and the column direction, including: The first sub-pixels and the second sub-pixels are arranged alternately in the row direction and the column direction; One of the first sub-pixel or the second sub-pixel is configured to have a positive polarity, and the other of the first sub-pixel or the second sub-pixel is configured to have a negative polarity.

5. The compensation method according to claim 1, characterized in that: The step of determining the minimum grayscale difference between adjacent pixel units based on one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data comprises: Obtaining a grayscale of each pixel unit based on one of the odd-numbered frame grayscale data or the even-numbered frame grayscale data; According to the grayscale of each pixel unit, a grayscale difference between adjacent pixel units is obtained; The minimum grayscale difference is determined from the grayscale differences between adjacent pixel units.

6. The compensation method according to claim 1, characterized in that: The step of determining the gamma voltage difference corresponding to the grayscale difference according to the relationship curve between the grayscale and the gamma voltage comprises: Setting the gamma voltage to be divided into a positive half-cycle gamma voltage and a negative half-cycle gamma voltage; Setting the common voltage to be greater than the negative half-cycle gamma voltage and less than the positive half-cycle gamma voltage; The gamma voltage difference is determined as shown in formula (1-1): deltagammaV=(V0-V6)*ΔV / 255 (1-1) Wherein, deltagammaV is the gamma voltage difference, V0 is the maximum value of the positive half-cycle gamma voltage, V6 is the minimum value of the positive half-cycle gamma voltage, and ΔV is the minimum grayscale difference.

7. The compensation method according to claim 6, characterized in that: The step of obtaining a correction value of the common voltage based on the gamma voltage difference comprises: One half of the gamma voltage difference is determined as the correction value.

8. The compensation method according to claim 7, characterized in that: After the step of obtaining a correction value of the common voltage based on the gamma voltage difference, the method further includes: superimposing the correction value to the initial common voltage to obtain a target common voltage; The twist of the liquid crystal is controlled based on the target common voltage, the positive half cycle gamma voltage, and the negative half cycle gamma voltage.

9. The compensation method according to any one of claims 1 to 8, characterized in that: Each pixel unit includes at least 9 sub-pixels distributed in an array, and the at least 9 sub-pixels have three different colors.

10. A liquid crystal display panel, characterized in that: The liquid crystal display panel implements the compensation method as described in any one of claims 1-9.

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