CN113707104B

CN113707104B - White balance adjustment method

Info

Publication number: CN113707104B
Application number: CN202110940706.6A
Authority: CN
Inventors: 崔剑明; 琚鹏
Original assignee: TCL China Star Optoelectronics Technology Co Ltd
Current assignee: TCL China Star Optoelectronics Technology Co Ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2022-09-27
Anticipated expiration: 2041-08-17
Also published as: CN113707104A

Abstract

The invention provides a white balance adjusting method which is used for adjusting the white balance of a display area of a display. The white balance adaptation method includes the steps of: s1, acquiring a first gray scale data table of a first area of the display area, wherein the first gray scale data table comprises n first gray scale data; s2, acquiring a second gray scale data table of a second area of the display area, wherein the second gray scale data table comprises n second gray scale data; s3, acquiring a third gray scale data table of a third area of the display area, wherein the third gray scale data table comprises n third gray scale data; s4, calculating a fourth gray scale data table according to the first gray scale data table, the second gray scale data table and the third gray scale data table, wherein the fourth gray scale data table comprises n fourth gray scale data; and S5, writing the fourth gray scale data table into the register of the display; wherein n is a positive integer.

Description

White balance adjustment method

Technical Field

The invention relates to the technical field of display, in particular to a white balance adjusting method.

Background

With the development of global informatization, display technology has become more and more important. As display technology advances, consumer demand for Picture Quality (PQ) of displays is increasing. Nowadays, in response to the PQ requirement of the increasingly important display in the display industry, various new display technologies have been developed besides the basic Liquid Crystal Display (LCD), such as: mini-LEDs (mini-LEDs), micro-LEDs (micro-LEDs), organic light-emitting diodes (OLEDs), and active-matrix organic light-emitting diodes (AMOLEDs), however, besides the LCDs which are developed for a long time and have relatively sophisticated technologies, other display technologies have some defects, such as short service life, high manufacturing cost, or low manufacturing yield.

In the display technology, when a display displays a display screen that is not all white or all black, it is called a color mixed screen. In other words, when any one of the gray scale values of red (R), green (G), and blue (B) in the display screen of the display is not 0, the display displays the mixed color screen. When the conventional LCD displays the color-mixed image, there is a certain probability that the display image will generate bright and dark line display.

The following example LCD displays the condition of the mixed color picture of R gray scale value 30, G gray scale value 128, and B gray scale value 16, namely (R30, G128, B16), wherein the R gray scale value, the G gray scale value, and the B gray scale value are expressed in a color depth of 8-bit. Fig. 1 is a diagram showing a variation of a sub-pixel column-voltage value in the prior art. In fig. 1, the horizontal axis represents the number of rows of the sub-pixels, and the vertical axis represents the voltage value. When one data line (data line) of the LCD is transmitting the gray scale value of the sub-pixels of the corresponding row, the goal is to generate the ideal variation waveform a as shown in fig. 1.

When the second row of subpixels L2 display the G grayscale value 128, since the first row of subpixels L1 displays the lower R grayscale value 30, the data lines must be quickly boosted between the first row of subpixels L1 and the second row of subpixels L2 to provide the necessary voltages for the second row of subpixels L2 to display the G grayscale value 128. However, in practical situations, since the charging of the second row sub-pixel L2 takes time, the second row sub-pixel L2 cannot display the G gray level value 128 as expected in real time, but generates the actual variation waveform A' as shown in FIG. 1. When the actual gray level of the second row of sub-pixels L2 is lower than the G gray level 128, the luminance of the second row of sub-pixels L2 is darker than the expected luminance, so that the LCD displays a dark line.

Similarly, when the data line is to be switched from the G gray scale value 128 displayed by the second row of higher subpixels L2 to the B gray scale value 16 displayed by the third row of lower subpixels L3, the third row of subpixels L3 cannot instantaneously display the B gray scale value 16 as expected because of the time required for discharging the third row of subpixels L3. When the gray scale value actually displayed by the third row subpixel L3 is higher than the B gray scale value 16, the luminance displayed by the third row subpixel L3 is brighter than the expected luminance, so that the LCD displays bright lines.

In order to solve the problem of bright and dark lines of the LCD, a Line Over Driving (LOD) technique is usually adopted, and the charging process of the second row sub-pixel L2 or the discharging process of the third row sub-pixel L3 is improved by outputting an overdrive voltage through the data line.

The following also exemplifies the situation when the LCD displays a mixed color picture (R30, G128, B16). Fig. 2 is a diagram illustrating the variation of the column-voltage values of the sub-pixels in the LOD technique according to the prior art. As shown in the LOD variation waveform B of fig. 2, when the data line is to be switched from the R gray-scale value 30 displayed by the lower first row of sub-pixels L1 to the G gray-scale value 128 displayed by the higher second row of sub-pixels L2, the data line first provides a voltage higher than the voltage necessary for the second row of sub-pixels L2 to display the G gray-scale value 128, so as to accelerate the boosting speed of the second row of sub-pixels L2, and generate the actual variation waveform B' shown in fig. 2, so that the luminance displayed by the second row of sub-pixels L2 reaches the desired luminance. Similarly, the LOD technique can also be used to accelerate the discharging speed of the third row of sub-pixels L3, so that the brightness displayed by the third row of sub-pixels L3 reaches the expected brightness.

However, in the conventional technology, when the method of applying the LOD technology is used to adjust the white balance of the LCD, hardware configurations such as an internet protocol address (IP) and a LOD chip need to be added, which will face the problem of increasing the manufacturing cost of the LCD. Moreover, each LCD would be time-consuming to adapt in one time, which directly increases the white balance adaptation cost of the LCD. Therefore, there is a need for a white balance adaptation method that can replace the LOD technique or reduce the adaptation time of the LOD technique.

Disclosure of Invention

The invention provides a white balance adjustment method for adjusting the white balance of a display area of a display, which can replace the conventional method for adjusting the display area by using a Line Over Driving (LOD) technology or reduce the adjustment time for adjusting the display area by using the LOD technology.

The white balance adaptation method includes the steps of:

s1, acquiring a first gray scale data table of a first area of the display area, wherein the first gray scale data table comprises n first gray scale data;

s2, acquiring a second gray scale data table of a second area of the display area, wherein the second gray scale data table comprises n second gray scale data;

s3, acquiring a third gray scale data table of a third area of the display area, wherein the third gray scale data table comprises n third gray scale data;

s4, calculating a fourth gray scale data table according to the first gray scale data table, the second gray scale data table and the third gray scale data table, wherein the fourth gray scale data table comprises n fourth gray scale data; and

s5, writing the fourth gray scale data table into a register of the display;

wherein n is a positive integer.

In one embodiment, the ith and the fourth gray scale data of the fourth gray scale data table are average data of the ith and the ith first, the ith and the ith third gray scale data of the first, the second and the third gray scale data tables, respectively. i is a positive integer less than or equal to n.

In one embodiment, the ith first gray scale data, the ith second gray scale data, the ith third gray scale data, and the ith fourth gray scale data respectively include RGB data including a red (R) gray scale value, a green (G) gray scale value, and a blue (B) gray scale value. The ith first gray scale data, the ith second gray scale data, and the ith third gray scale data represent an R gray scale value, a G gray scale value, and a B gray scale value of the first region, the second region, and the third region at an ith white (W) gray scale value, respectively. When i is 0, the W gray scale value is a gray scale value of the display area which is completely black. When i is equal to n, the W gray scale value is a gray scale value of the full white of the display area.

In one embodiment, the R gray scale value of the RGB data of the ith and fourth gray scale data is an average value of the R gray scale value of the RGB data of the ith and first gray scale data, the R gray scale value of the RGB data of the ith and second gray scale data, and the R gray scale value of the RGB data of the ith and third gray scale data. The G gray-scale value of the RGB data of the ith fourth gray-scale data is an average value of the G gray-scale value of the RGB data of the ith first gray-scale data, the G gray-scale value of the RGB data of the ith second gray-scale data, and the G gray-scale value of the RGB data of the ith third gray-scale data. The B gray scale value of the RGB data of the ith fourth gray scale data is an average value of the B gray scale value of the RGB data of the ith first gray scale data, the B gray scale value of the RGB data of the ith second gray scale data, and the B gray scale value of the RGB data of the ith third gray scale data.

In an embodiment, a center point of the first area is located on a center point of the display area.

In an embodiment, a center point of the second area is located on a symmetry axis of the display area.

In an embodiment, the axis of symmetry of the display area intersects any edge of the display area, the center point of the second area being one sixth the distance from the edge of the display area (1/6).

In an embodiment, a center point of the third area is located on a diagonal of the display area.

In one embodiment, the diagonal of the display area intersects any vertex of the display area, and the center point of the third area is one sixth of the distance between the center point of the display area and the vertex (1/6).

In an embodiment, the first region, the second region, and the third region are circular regions having a predetermined radius, respectively.

The white balance adjustment method of the invention carries out multi-point white balance adjustment on the display area of the display. The display data of the display after debugging can be more suitable for each area of the whole display area, and white balance adjustment can be performed on a large-size display with large charge-discharge difference in the display area. The present invention is able to replace the LOD technique and achieve the same adaptation results as compared to the prior art. Therefore, the display adopting the white balance adjustment method of the invention does not need to set hardware configurations such as internet protocol address (IP) and LOD chip corresponding to the LOD technology, thereby reducing the manufacturing cost of the display and shortening the adjustment time of the display. In addition, for the display adopting the LOD technology, the invention can also reduce the adapting time of the LOD technology for adapting the display area, so that the manufacturer obtains a more efficient production line.

Drawings

FIG. 1 is a diagram of a variation of a sub-pixel column-voltage value in the prior art.

Fig. 2 is a diagram illustrating a variation of a sub-pixel row-voltage value in a Line Over Driving (LOD) technique according to a conventional technique.

Fig. 3 is a flowchart of a white balance adaptation method according to the present invention.

Fig. 4 is a schematic view of a display area of the display according to the present invention.

FIG. 5 is a diagram of variations in subpixel row-to-voltage values according to the present invention.

Detailed Description

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Referring to fig. 3 and fig. 4, fig. 3 is a flowchart illustrating a white balance adjustment method according to the present invention, and fig. 4 is a schematic diagram illustrating a display area of a display according to the present invention. The present invention provides a white balance adjustment method for adjusting the white balance of the display area 100 of the display shown in fig. 4. The white balance adaptation method includes steps S1-S5.

During the process of adapting the display, the present invention acquires gray scale data of the display area 100 by the color analyzer CA-310 of Konikamebenda. When the display displays the mixed color picture, the probe of the color analyzer CA-310 is placed in the display area 100, and the probe of the color analyzer CA-310 collects the gray scale data of the display area 100 displaying the mixed color picture in each mixed color picture and outputs a gray scale data table.

In step S1, the white balance adaptation method places the probe of the color analyzer CA-310 in a first region 101 of the display region 100. A first gray scale data table of the first region 101 is acquired by the color analyzer CA-310. The first gray scale table is shown in table 1 below, each row of data is first gray scale data, the first gray scale data table includes n first gray scale data, and n is a positive integer.

Table 1: first gray scale table

W gray scale value	R gray scale value	G gray scale value	B gray scale value
				0	0	0	0
1	15	15	13
				2	30	30	26
3	45	46	39
				4	60	61	52
5	64	65	56
				…	…	…	…
1020	4074	4069	3989
				1021	4076	4073	4003
1022	4078	4076	4018
				1023	4080	4080	4032

In step S2, the white balance adaptation method places the probe of the color analyzer CA-310 in the second region 102 of the display region 100. A second gray scale data table for the second region 102 is obtained by the color analyzer CA-310. The second gray scale table is shown in table 2 below, each row of data is a second gray scale data, the second gray scale data table includes n second gray scale data, and n is a positive integer.

Table 2: second gray scale

W gray scale value	R gray scale value	G gray scale value	B gray scale value
				0	0	0	0
1	14	15	12
				2	29	30	25
3	44	44	38
				4	58	59	50
5	63	64	54
				…	…	…	…
1020	4076	4074	3975
				1021	4077	4076	3994
1022	4079	4078	4013
				1023	4080	4080	4032

In step S3, the white balance adaptation method places the probe of the color analyzer CA-310 in the third area 103 of the display area 100. A third gradation data table of the third region 103 is acquired by the color analyzer CA-310. The third gray scale table is shown in table 3 below, each row of data is third gray scale data, the third gray scale data table includes n third gray scale data, and n is a positive integer.

Table 3: third gray scale table

As shown in tables 1 to 3, the ith first gray scale data of the first gray scale data table, the ith second gray scale data of the second gray scale data table, and the ith third gray scale data of the third gray scale data table respectively include RGB data, and i is a positive integer less than or equal to n. The RGB data includes red (R), green (G), and blue (B) gray scale values. The ith first gray scale data, the ith second gray scale data, and the ith third gray scale data represent an R gray scale value, a G gray scale value, and a B gray scale value of the first region 101, the second region 102, and the third region 103, respectively, at an ith white (W) gray scale value. When i is 0, the W grayscale value is a grayscale value of the display area 100 being completely black. When i is equal to n, the W grayscale value is a grayscale value of the display area 100 being completely white.

In one embodiment, the W gray scale values of the first, second, and third gray scale data tables are expressed by a color depth of 10-bit, so the minimum value of the W gray scale values is 0 and the maximum value is 1023. The numerical value of color depth represents the number of colors that each subpixel of the display can display. As the number of color depths increases, the number of colors that can be displayed by the display also increases. In this embodiment, the first gray scale data table, the second gray scale data table, and the third gray scale data table obtained by using the W gray scale value expressed by the 10-bit color depth respectively have 1024 pieces of the first gray scale data, 1024 pieces of the second gray scale data, and 1024 pieces of the third gray scale data.

In one embodiment, the R, G, and B gray scale values of the first, second, and third gray scale data tables are expressed by a color depth of 12-bit, so that the minimum value of the R, G, and B gray scale values is 0 and the maximum value thereof is 4080. The R gray scale value, the G gray scale value and the B gray scale value displayed by the display are represented by the color depth of 12-bit, so that the colors which can be displayed by the display can be more effectively refined, and the adaptation precision of the invention to each sub-pixel is enhanced.

As shown in FIG. 3, in step S4, the present invention calculates a fourth gray scale data table according to the first gray scale data table, the second gray scale data table, and the third gray scale data table. The fourth gray scale table is shown in table 4 below, and similarly, the fourth gray scale data table includes n fourth gray scale data. The ith fourth gradation data of the fourth gradation data table also includes the RGB data, that is, the R gradation value, the G gradation value, and the B gradation value.

Table 4: fourth gray scale table

The ith fourth gray scale data of the fourth gray scale data table is the ith first gray scale data of the first gray scale data table, the ith second gray scale data of the second gray scale data table and the average data of the ith third gray scale data of the third gray scale data table, and i is a positive integer less than or equal to n.

For example, as shown in the following table 5, the first three rows of data show the 6 th first gray scale data of the first gray scale data table, the 6 th second gray scale data of the second gray scale data table, and the 6 th third gray scale data of the third gray scale data table. The fourth line data shows the fourth gradation data of the 6 th one of the fourth gradation data tables.

Table 5: 6 th first, second, third, and fourth gray scale data sorting tables

	W gray scale value	R gray scale value	G gray scale value	B gray scale value
					6 th of the first gray scale data	5	64	65	56
6 th of the second gradation data	5	63	64	54
					6 th of the third gradation data	5	60	62	51
6 th said fourth gray scale data	5	62	64	54

In one embodiment, the R gray-scale value of the RGB data of the ith fourth gray-scale data is an average value of the R gray-scale value of the RGB data of the ith first gray-scale data, the R gray-scale value of the RGB data of the ith second gray-scale data, and the R gray-scale value of the RGB data of the ith third gray-scale data. As can be seen from table 5, the R grayscale value of the 6 th first grayscale data is 64, the R grayscale value of the 6 th second grayscale data is 63, and the R grayscale value of the 6 th third grayscale data is 60. Accordingly, the R gradation values of the 6 th and fourth gradation data are an average value 62.33 of 64, 63, and 60. Rounding the value of 62.33 to an integer to obtain the value of 62 for the R gray scale of the 6 th fourth gray scale data.

Similarly, the G gray scale value of the RGB data of the ith fourth gray scale data is an average value of the G gray scale value of the RGB data of the ith first gray scale data, the G gray scale value of the RGB data of the ith second gray scale data, and the G gray scale value of the RGB data of the ith third gray scale data. As can be seen from table 5, the G grayscale value of the 6 th first grayscale data is 65, the G grayscale value of the 6 th second grayscale data is 64, and the G grayscale value of the 6 th third grayscale data is 62. Accordingly, the G gradation value of the 6 th of the fourth gradation data is an average value 63.67 of 65, 64, and 62. Rounding the value 63.67 to an integer, the G gray scale value of the 6 th fourth gray scale data is 64.

Similarly, the B gray scale value of the RGB data of the ith fourth gray scale data is an average value of the B gray scale value of the RGB data of the ith first gray scale data, the B gray scale value of the RGB data of the ith second gray scale data, and the B gray scale value of the RGB data of the ith third gray scale data. As can be seen from table 5, the B-gray scale value of the 6 th first gray scale data is 56, the B-gray scale value of the 6 th second gray scale data is 54, and the B-gray scale value of the 6 th third gray scale data is 51. Therefore, the B gradation values of the 6 th and fourth gradation data are the average value 53.67 of 56, 54, and 51. Rounding the value 53.67 to an integer, the B-level value of the 6 th fourth gray-level data is 54.

In the white balance adjustment method of the present invention, the fourth gray scale data table is formed after averaging the n RGB data of the first, second, and third gray scale data tables by the above calculation method. The fourth gray scale data table can represent the average gray scale data of different areas of the display area 100 of the display.

Finally, as shown in FIG. 3, in step S5, the present invention writes the fourth gray scale data table calculated in the previous step into a register of the display. Since the fourth gray scale data table represents average gray scale data of different areas of the display area 100 of the display, the fourth gray scale data table obtained by measuring the display area 100 at multiple points is written into the display in this step, so that the display area 100 of the display can be displayed more uniformly in the color mixing picture.

In one embodiment, as shown in fig. 4, the center point 201 of the first area 101 is located on the center point 200 of the display area 100. In the vicinity of the center point 200 of the display area 100, the viewer views the display most directly and stays in the longest gaze, so the first gray scale data table of the present invention is obtained for the first area 101 located in the center of the display area 100.

In one embodiment, as shown in fig. 4, the center point 202 of the second area 102 is located on the symmetry axis 301 or the symmetry axis 302 of the display area 100. The present invention selects the second region 102 located on the symmetry axis 301 or the symmetry axis 302 of the display region 100 as a second measurement point. The two symmetry axes of the second region 102 are the second region that the viewer watches and has the next longest eye when watching the display, compared to the first region 101 located at the center 200 of the display region 100. Therefore, the second gray scale data table of the present invention must also acquire the second region 102 located on the symmetry axis 301 or the symmetry axis 302 of the display region 100.

Preferably, in the present embodiment, the second region 102 is located on the symmetry axis 301 in the longitudinal direction. As shown in fig. 4, the axis of symmetry 301 of the display area 100 intersects an edge 501 of the display area 100. In order to effectively separate the n second gray scale data of the second region 102 from the n first gray scale data of the first region 101, the present invention sets the distance D1 between the center point 202 of the second region 102 and the edge 501 to be one sixth of the distance D2 between the center point 200 of the display region 100 and the edge 501 (1/6). Since the second area 102 is separated from the first area 101 by a certain distance, the second gray scale data table obtained from the second area 102 can only effectively reflect the display performance of the edge area of the display area 100 in the color-mixed picture.

In one embodiment, as shown in fig. 4, the center point 203 of the third area 103 is located on the diagonal 401 or the diagonal 402 of the display area 100. The third area 103 on the diagonal 401 or the diagonal 402 of the display area 100 is selected as a third measurement point. Compared to the first area 101 located at the center 200 of the display area 100, the two diagonal lines of the third area 103 are the second area that the viewer watches and stays in the next longest time when watching the display. Therefore, the third gray scale data table of the present invention must also acquire the third area 103 located on the diagonal line 401 or the diagonal line 402 of the display area 100.

Preferably, in this embodiment, the third area 103 is located on the diagonal line 401 between the upper left corner and the lower right corner of the display area 100. As shown in fig. 4, the diagonal 401 of the display area 100 intersects the vertex 502 of the display area 100. In order to effectively separate the n third gray scale data of the third region 103 from the n first gray scale data of the first region 101 and the n second gray scale data of the second region 102, the present invention sets the distance D3 between the center point 203 of the third region 103 and the vertex 502 to be one sixth of the distance D4 between the center point 200 of the display region 100 and the vertex 502 (1/6). Since the third area 103 is separated from the first area 101 and the second area 102 by a certain distance, the third gray scale data table obtained from the third area 103 can effectively reflect the display performance of the corner area of the display area 100 in the color mixing screen.

In an embodiment, as shown in fig. 4, the first region 101, the second region 102, and the third region 103 are circular regions having a predetermined radius R. Since the white balance adaptation method of the present invention is to place the probes of the color analyzer CA-310 on the first region 101, the second region 102, and the third region 103 to acquire the RGB data, the ranges of the first region 101, the second region 102, and the third region 103 should correspond to the probe selection.

Preferably, in the present embodiment, the probe of the color analyzer CA-310 employs a gauge of 27 mm in diameter

Accordingly, the first region 101, the second region 102, and the third region 103 are each circular regions having a radius of 13.5 mm. Further, when the probe of the color analyzer CA-310 adopts a gauge of 10 mm in diameter

The first area 101, the second area 102, and the third area 103 are selected to be circular areas each having a radius of 5 mm.

Fig. 5 is a diagram showing variations of sub-pixel row-voltage values according to the present invention. The display adapted by the white balance adaptation method of the present invention will present an adapted variation waveform C as shown in fig. 5. The fourth gray scale data table adjusts the initial voltage of the display area 100 when displaying the R gray scale value or the B gray scale value.

When the data line of the display is to be switched from the R gray-scale value 30 displayed by the lower first row of sub-pixels L1 to the G gray-scale value 128 displayed by the higher second row of sub-pixels L2, since the initial voltage of the first row of sub-pixels L1 has been increased by the adjustment of the fourth gray-scale data table, the actual variation waveform C' shown in fig. 5 is generated, so that the second row of sub-pixels L2 is quickly increased to the necessary voltage for displaying the G gray-scale value 128 when charging, and therefore the luminance displayed by the second row of sub-pixels L2 can reach the desired luminance without causing the display area 100 of the display to display dark lines.

Similarly, when the data line of the display is to be switched from the G gray-scale value 128 displayed by the second row of higher sub-pixel L2 to the B gray-scale value 16 displayed by the third row of lower sub-pixel L3, since the initial voltage of the third row of sub-pixel L3 is already increased by the adjustment of the fourth gray-scale data table, the actual variation waveform C' shown in fig. 5 is generated, so that the third row of sub-pixel L3 rapidly decreases to the necessary voltage for displaying the B gray-scale value 16 when discharging, and therefore the luminance displayed by the third row of sub-pixel L3 can reach the desired luminance without causing the display area 100 of the display to display bright lines.

After the present invention writes the calculated fourth gray scale data table into a register of the display. The color analyzer CA-310 may measure any one of the display areas 100 of the display, and determine whether the fourth gray-scale data table calculation result meets the requirement of Picture Quality (PQ) according to a measured gamma (gamma) curve. Generally, when the gamma value is equal to 2.2, the white balance adaptation can be considered successful. In addition, whether the display area 100 of the display has color cast and the brightness inversion phenomenon that the low gray level brightness is higher than the high gray level brightness can be observed through visual confirmation of an on-line worker, and if no abnormity occurs, the display can be confirmed to meet the PQ requirement.

The display adapted by the white balance adaptation method of the present invention can further adapt the display area 100 of the display more strictly by a Line Over Driving (LOD) technique, for example, adopt a LOD gain (gain) to further perform color compensation on the color mixing picture of the display area 100. When the display needs accurate color compensation under a heavy-load picture, the numerical value of the compensation required by the LOD gain can be reduced through the matching of the invention and the LOD gain, and the display can more accurately display the color of the mixed color picture.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. A white balance adapting method for adapting a white balance of a display area of a display, the white balance adapting method comprising:

s4, calculating a fourth gray scale data table according to the first gray scale data table, the second gray scale data table and the third gray scale data table, wherein the fourth gray scale data table comprises n fourth gray scale data;

specifically, the ith fourth gray scale data of the fourth gray scale data table is the ith first gray scale data of the first gray scale data table, the ith second gray scale data of the second gray scale data table, and the ith average data of the third gray scale data table, where i is a positive integer less than or equal to n;

s5, writing the fourth gray scale data table into a register of the display;

wherein n is a positive integer.

2. The white balance adaptation method according to claim 1, wherein the ith said first gray scale data, the ith said second gray scale data, the ith said third gray scale data, and the ith said fourth gray scale data respectively comprise RGB data including red R gray scale values, green G gray scale values, and blue B gray scale values;

the ith first gray scale data, the ith second gray scale data, and the ith third gray scale data respectively represent an R gray scale value, a G gray scale value, and a B gray scale value of the first region, the second region, and the third region at an ith white W gray scale value;

when i is 0, the W gray scale value is a gray scale value of the display area which is completely black; and

when i is equal to n, the W gray scale value is a gray scale value of the full white of the display area.

3. The white balance adaptation method according to claim 2, wherein the R gray-scale value of the RGB data of the ith the fourth gray-scale data is an average value of the R gray-scale value of the RGB data of the ith the first gray-scale data, the R gray-scale value of the RGB data of the ith the second gray-scale data, and the R gray-scale value of the RGB data of the ith the third gray-scale data;

the G gray-scale value of the RGB data of the ith fourth gray-scale data is an average value of the G gray-scale value of the RGB data of the ith first gray-scale data, the G gray-scale value of the RGB data of the ith second gray-scale data, and the G gray-scale value of the RGB data of the ith third gray-scale data; and

the B gray scale value of the RGB data of the ith fourth gray scale data is an average value of the B gray scale value of the RGB data of the ith first gray scale data, the B gray scale value of the RGB data of the ith second gray scale data, and the B gray scale value of the RGB data of the ith third gray scale data.

4. The white balance adaptation method according to claim 1, wherein a center point of the first region is located on a center point of the display region.

5. The white balance adaptation method according to claim 1, wherein a center point of the second region is located on a symmetry axis of the display region.

6. The white balance adaptation method according to claim 5, wherein the axis of symmetry of the display region intersects any one edge of the display region, and a distance between the center point of the second region and the edge is one sixth of a distance between the center point of the display region and the edge.

7. The white balance adaptation method according to claim 1, wherein a center point of the third region is located on a diagonal line of the display region.

8. The white balance adaptation method according to claim 7, wherein the diagonal line of the display region intersects any vertex of the display region, and a distance between the center point of the third region and the vertex is one sixth of a distance between the center point of the display region and the vertex.

9. The white balance adaptation method according to claim 1, wherein the first region, the second region, and the third region are each a circular region having a preset radius.