WO2022021423A1

WO2022021423A1 - Method for constructing compensation correction table in liquid crystal display device, and liquid crystal display device

Info

Publication number: WO2022021423A1
Application number: PCT/CN2020/106417
Authority: WO
Inventors: 杨梅; 刘军; 熊志天
Original assignee: 华为技术有限公司
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2022-02-03

Abstract

A method for constructing a compensation correction table of insufficient charging rate in a corresponding liquid crystal display device of higher efficiency and accuracy. The method comprises: corresponding to each initial compensation correction value in an initial linear compensation correction table, constructing a preset image according to image data received by a current pixel unit and a compensation reference pixel unit; determining a target value reaching a preset charge rate in each corresponding preset image; detecting chromaticity coordinates and a luminance value when the preset image is displayed, to obtain a detection value; performing compensation correction on the initial compensation correction value according to the detection value and the target value; and correcting each initial compensation correction value in the initial linear compensation correction table to obtain the compensation correction table. Also provided is a liquid crystal display device comprising the compensation correction table.

Description

Construction method of compensation correction table in liquid crystal display device and liquid crystal display device

technical field

The embodiments of the present application relate to the technical field of image processing, and in particular, to a method for constructing a compensation correction table of a liquid crystal display device and a liquid crystal display device.

Background technique

With the development of liquid crystal display technology, large size and high resolution have become the mainstream trend of liquid crystal display panels. However, in panel design, the larger the size, the greater the difference in image data attenuation at different positions inside the LCD panel due to the impedance effect (RC). Further, the image data is insufficiently charged to the pixel unit (the charging rate is low), and at the same time, the charging rate of different positions of the liquid crystal display panel will also have a large difference, resulting in differences in the image data provided to different display positions in the liquid crystal display panel. As a result, the uniformity of the liquid crystal display panel is visually poor.

At present, the charging rate of each pixel unit in the liquid crystal display panel is determined by detecting the signal wiring impedance information of the image data transmission in the liquid crystal display panel, and then the image signal is corrected and compensated according to the charging rate of the pixel unit obtained by the detection to make the crystal display panel The charging of all pixel units reaches uniformity. However, in fact, the electrical characteristics (impedance information) of the signal traces in the liquid crystal panel and the circuit parameter values of each pixel unit can determine the charging rate of each pixel unit. Since there are many electronic components on the substrate where the signal traces are set, the signal It is difficult to accurately measure the electrical characteristics of the wiring and the pixel unit, and the workload is large, so that the calculation accuracy of the charging rate is not high.

SUMMARY OF THE INVENTION

In order to solve the aforementioned technical problems, the embodiments of the present application provide a method for constructing a compensation correction table with high efficiency and accuracy, corresponding to insufficient charging rate of a liquid crystal display panel, and a liquid crystal display device including the foregoing compensation correction table.

In a first aspect, in an implementation manner of the present application, a method for constructing a compensation correction table in a liquid crystal display is provided, and a method for constructing a compensation correction table in a liquid crystal display device is provided. The display panel includes a plurality of pixel units arranged in a matrix, the plurality of pixel units include a current pixel unit and a compensation reference pixel unit, and the current pixel unit and the compensation reference pixel unit are received from the same data line image data, and are scanned in two adjacent scan cycles. The construction method includes:

establishing an initial and linear compensation correction table, the compensation correction table includes a plurality of compensation correction values, each of the compensation correction values corresponds to the image data received by the current pixel unit and the compensation reference pixel unit;

A preset image is constructed corresponding to the number of images received by the current pixel unit and the compensation reference pixel unit corresponding to any compensation compensation correction value in the initial compensation correction table, and the preset image is provided to the display panel of the liquid crystal at least The grayscale values of all pixel units in a frame of image;

determining a target value corresponding to the preset charging rate in each preset image, where the target value includes target chromaticity coordinates and luminance values when the image is displayed;

Calculate the compensation value update amount corresponding to each compensation correction value in the compensation correction table according to the target value and adopt a convergence algorithm, and update the compensation correction table according to the compensation value update amount;

Look up the compensation correction value in the compensation correction table for the position of the pixel unit to be loaded for each image data, and replace the image data with the compensation correction value obtained by searching, and output the corrected image data to the The pixel unit corresponding to the display panel performs image display;

Detecting the chromaticity coordinates and luminance values of the image displayed in the preset area of the display panel to obtain a detection value, and confirming whether the detection value is within the preset range of the target value, when the detection value is within the target value within the range, the compensation correction value completes the correction,

When the detected value exceeds the target value range, the compensation correction value is adjusted according to the detected value and the target value adjustment, and the image data is corrected and displayed according to the adjusted compensation correction value. When the detected value is within the target value range, the correction is completed.

The preset image is automatically constructed by each compensation correction value in the initialized compensation correction table and the target value satisfying the preset charging rate is determined, and the corresponding compensation correction value in the automatic correction according to the preset image and the target value is used, which effectively improves the construction Compensate the efficiency and accuracy of the calibration table.

In an embodiment of the present application, in the linear compensation correction table, the first direction coordinate represents image data corresponding to the compensation reference pixel unit, and the second direction represents image data corresponding to the current pixel unit , the intersection of the first direction coordinate and the second direction coordinate represents the compensation correction value of the image data corresponding to the current pixel unit, wherein the compensation correction value in the linear compensation correction table is the same as that of the current pixel unit The image data corresponding to the cells are the same.

The compensation correction value included in the compensation correction table corresponds to the grayscale value of the pixel unit currently displayed by the row-level overdrive technology, wherein the current pixel unit and the image data of the compensation reference pixel unit can be accurately corrected and compensated. image data in the pixel unit, the image data received by the pixel unit of the current row can effectively compensate for the low brightness or chromaticity of the pixel unit due to insufficient charging rate, and ensure the uniformity and accuracy of image display.

In an embodiment of the present application, the display panel includes a plurality of scan signal lines extending along a first direction and a plurality of data lines extending along a second direction to form a plurality of pixel units arranged in a matrix, the first One direction is perpendicular to the second direction, the plurality of scan lines respectively provide scan signals to the pixel units in each scan period according to the scan timing, and the data lines are used for providing image data to the pixel units in each scan period. The polarity of the image data received by the pixel unit, the current pixel unit and the compensation reference pixel unit is the same. In the preset pattern, the image data of three pixel units that emit light of different colors in each imaging pixel unit are (X, Y, Y), (Y, X, Y), (Y, Y, X), Any one of (Y,X,X,), (X,Y,X) and (X,X,Y), the X is the image data received by the compensation reference pixel unit, and the Y is the current pixel Image data received by the unit. The compensation correction table is constructed according to the compensation reference pixel unit corresponding to the compensation correction value and the image data corresponding to the current pixel unit, so that the display image currently used for correction corresponds to the current correction compensation value accurately, so that the compensation correction value can be more accurately performed. Correction, which improves the correction accuracy of the compensation correction value.

In an embodiment of the present application, the display panel includes a plurality of scan signal lines extending along a first direction and a plurality of data lines extending along a second direction to form a plurality of pixel units arranged in a matrix, the first One direction is perpendicular to the second direction, the plurality of scan lines respectively provide scan signals to the pixel units in each scan period according to the scan timing, and the data lines are used for providing image data to the pixel units in each scan period. For the pixel unit, the polarity of the image data received by the current pixel unit and the compensation reference pixel unit is opposite. A heteropolarity compensation correction table is constructed for the heteropolar pixel units in the display panel, and a homopolarity compensation correction table is established for the homopolarity pixel units in the display panel, and the heteropolarity pixel units are for In the pixel units of the same column, the pixel units of the opposite polarity to the image data received by the pixel units of the previous row, the pixel units of the same polarity are the pixel units of the same column, and the image data received by the pixel units of the previous row. Pixel cells with the same polarity. Compensation and correction tables are respectively constructed for the same-polarity pixel units and the different-polarity pixel units in the different-polarity display panel, so as to ensure better compensation and correction accuracy of graphic data.

In an embodiment of the present application, when the polarities of the image data received by the current pixel unit and the compensation reference pixel unit are opposite, the same-polarity compensation and correction table is constructed after the construction of the hetero-polarity compensation and correction table is completed. surface. Since the polarities of the image data received by the pixel units in the heteropolar pixel units are reversed, a precharge driving method needs to be performed, so the pre-construction of the heteropolarity compensation correction table can effectively improve the accuracy of the compensation correction value.

In an embodiment of the present application, when constructing the heteropolarity compensation correction table, the preset pattern includes a plurality of basic image areas, and the basic image area includes j*1 imaging pixel units, wherein each In the imaging pixel unit, the three pixel units that emit light of different colors, the image data of the three pixel units that emit light of different colors in each imaging pixel unit are the same, and among the image data of the j imaging pixel units, two adjacent ones The image data of different polarity pixel units are X and Y respectively, where X is the image data received by the compensation reference pixel unit, and Y is the image data received by the current pixel unit. The basic image area can effectively adapt to the different requirements of the number of pixel units and the order of polarity arrangement in display panels of different specifications, which improves the popularity of the preset image.

In an embodiment of the present application, the j is 4, and the basic image area includes 4*1 imaging pixel units, wherein the first polarity is positive, the second polarity is negative, and The image data of the 4*1 imaging pixel unit is:

X,X,X;

Y, Y, Y;

X,X,X; or

Y, Y, Y;

X,X,X;

Y, Y, Y.

In an embodiment of the present application, when constructing the same-polarity compensation correction table, the preset pattern includes a plurality of basic image areas, and the basic image area includes j*1 imaging pixel units, wherein each In the imaging pixel unit, the three pixel units that emit light of different colors, the image data of the three pixel units that emit light of different colors in each imaging pixel unit are the same, and among the image data of the j imaging pixel units, two adjacent ones The image data of the same polarity pixel unit are X and Y respectively, where X is the image data received by the compensation reference pixel unit, and Y is the image data received by the current pixel unit. The basic image area can effectively adapt to the different requirements of the number of pixel units and the order of polarity arrangement in display panels of different specifications, which improves the popularity of the preset image.

X,X,X;

Y, Y, Y;

Y,Y,Y; or

Y, Y, Y;

X,X,X;

X, X, X.

In an embodiment of the present application, the image data is a grayscale value, and the compensation correction value in the corresponding compensation correction table is a grayscale value. The gray-scale value can more accurately characterize the relationship between the image data and the display brightness of the pixel unit, and the gray-scale value exists in the form of a digital signal, which is convenient for storage and comparison.

In an embodiment of the present application, the determining a target value corresponding to each preset image to reach the preset charging rate includes:

Detecting the white point gamma curve of the preset value of the display panel, and detecting the color gamut coordinate value and brightness value of the maximum brightness of red, green and blue;

Performing a Degamma operation on the preset image according to the white-field gamma curve to obtain a normalized RGB luminance value, wherein the RGB luminance value is a component of red, green and blue primary color light in the preset image;

Perform RGB luminance value to XYZ color gamut space conversion and obtain the XYZ chromaticity coordinate value of normalized XYZ color gamut space;

quantizing the normalized XYZ chromaticity coordinate values;

The quantized XYZ chromaticity coordinate values are converted into color gamut coordinate values and luminance values to obtain the target value.

The normalized XYZ chromaticity coordinate values are quantized to achieve the real luminance value, so that the target value can be compared with the actual detected value.

In an embodiment of the present application, when each preset image is displayed on the display panel, the target value should reach the chromaticity coordinate value and the luminance value when the charging rate of each pixel unit is 100%. The chromaticity package and brightness in the target value are the objective criteria for evaluating the charging rate of the LCD panel based on the third color mixing theorem. Combined with the objective convergence conditions in the automatic convergence algorithm, the exact corresponding charging rate of each preset image is 100%. The target value of , improves the accuracy of the correction algorithm for obtaining the compensation correction value.

In an embodiment of the present application, when the correction of each compensation correction value in the initial compensation correction table is completed, the composition of the compensation correction table is completed. When each compensation value in the initial linearity compensation table performs the aforementioned correction and reaches the factor and range, that is, each compensation value in the initial linearity compensation table can make the preset image display When the chromaticity coordinate value and brightness meet the requirements of the charging rate, the compensation correction compensation table is constructed.

In a second aspect, in an implementation manner of the present application, a liquid crystal display device is provided, which includes a display panel and the aforementioned compensation and correction table, and the liquid crystal display device further includes a data driving circuit, a scanning driving circuit and a display control circuit. A data driving circuit, wherein the compensation correction table is stored in the display control circuit. The display control circuit is connected to the data drive circuit and the scan drive circuit, and the display control circuit outputs a synchronization signal to the data drive circuit and the scan drive circuit according to the received image data, and provides the compensation and correction Table compensated image data to the data driving circuit. The scan driving circuit is connected to the plurality of scan lines to provide scan signals to the plurality of scan lines according to scan timing. The data driving circuit is connected to the plurality of data lines, and is used for converting the image data held and transmitted in the form of gray-scale values into corresponding analog voltage values and transmitting them to the pixel unit. In the liquid crystal display device, the aforementioned compensation correction table is used to compensate and correct the image to be displayed when performing image display, which can effectively avoid the problem of insufficient charging of pixel units when displaying image data, so that the image display can be more accurate and uniform.

Description of drawings

FIG. 1 is a schematic diagram of a side structure of a liquid crystal display device according to a first embodiment of the present application;

FIG. 2 is a schematic diagram of a plane layout structure of the liquid crystal display device shown in FIG. 1;

Fig. 3 is the detailed block diagram of the display control circuit shown in Fig. 2;

4 is a schematic diagram of the layout of a pixel unit in the display panel shown in FIG. 2;

5 is a schematic diagram of the distribution of pixel units in the display panel shown in FIG. 2 according to the second embodiment of the present application;

6 is a functional block diagram of a system for setting a compensation correction table corresponding to a charging rate according to a third embodiment of the present application;

FIG. 7 is a schematic flowchart of constructing a charging rate compensation correction table using the compensation correction table setting system shown in FIG. 6 in the fourth embodiment of the application;

8 is a schematic diagram of a linear compensation correction table constructed as shown in FIG. 7;

Fig. 9 is a schematic diagram of the image display data matrix constructed as shown in Fig. 7;

Fig. 10 is the flow chart of determining target value as shown in Fig. 7;

11 is a schematic diagram of a compensation correction table after compensation and correction as shown in FIG. 7;

FIG. 12 is a schematic diagram of a flowchart of constructing a compensation table for an opposite polarity panel according to the fifth embodiment of the present application;

Figure 13 is a schematic diagram of the image display data matrix constructed as shown in Figure 12;

Figure 14 is a schematic diagram of the image display data matrix constructed as shown in Figure 12;

FIG. 15 is a schematic diagram of the same-polarity compensation correction table and the same-polarity compensation correction table after compensation and correction as shown in FIG. 12 .

detailed description

The present application will be described below with specific examples.

FIG. 1 is a schematic diagram of a side structure of a liquid crystal display device 10 according to an embodiment of the present application. As shown in FIG. 1, the liquid crystal display device 10 includes a display panel 13, a backlight module BM (Backlight Module), wherein the backlight module BM is used to provide light for display to the display panel 13, and the display panel 13 is based on the image to be displayed. Data (Data) emits corresponding rays to perform image display. The liquid crystal display device 10 further includes other elements or components, such as a power module, a signal processor module, a signal sensing module, and the like.

The display panel 13 includes an array substrate AS (Array substrate), a color film substrate (CF), and a liquid crystal layer LC sandwiched between the array substrate AS and the opposite substrate CF. The array substrate AS and the color filter substrate CF are provided with driving elements to generate a corresponding electric field according to the image data Data, thereby driving the rotation angle of the liquid crystal molecules in the liquid crystal layer LC to emit light with corresponding brightness to perform image display.

Please refer to FIG. 2 , which is a schematic diagram of a planar layout structure of the liquid crystal display device 10 shown in FIG. 1 .

As shown in FIG. 2 , the liquid crystal display device 10 includes a data driving circuit 11 , a scanning driving circuit 12 , a display panel 13 and a display control circuit 14 .

Inside the display panel 13, a plurality of scan lines (Scan lines) G1 to Gn extending along the first direction F1 and a plurality of data lines (Data lines) D1 to extending along the second direction F2 are mutually arranged in a grid shape. Dm. The first direction F1 and the second direction F2 are perpendicular to each other, and the plurality of scanning signal lines, the plurality of data lines, and the scanning lines and the data lines are insulated from each other.

Pixel units 15 are correspondingly provided at the intersections of the plurality of scan lines G1 to Gn and the data lines D1 to Dm. The pixel unit 15 includes a driving element and a liquid crystal layer LC. The liquid crystal layer LC emits light under the driving of the driving element. In this embodiment, the driving element includes a semiconductor switch element and an energy storage element, the semiconductor switch may be a thin film transistor TFT, and the energy storage element may be a capacitor.

The scan lines G1 to Gn are connected to the scan drive circuit 12 to receive scan signals from the scan drive circuit 12 , and the data lines D1 to Dm are connected to the data drive circuit 31 to receive the data stored and transmitted in the form of grayscale values provided by the data drive circuit 11 . The image data Data are converted into corresponding analog voltage values.

The pixel unit 15 drives the liquid crystal layer LC to deflect a corresponding angle by receiving the voltage values of the grayscale values in the corresponding image data provided by the data lines D1 to Dm in a predetermined period of time under the control of the scanning lines G1 to Gn, thereby deflecting the received backlight according to the deflection. The corresponding angle of the radiator emits light with corresponding brightness, so as to achieve image display by emitting light with corresponding brightness according to the image data.

The display control circuit 14 receives image data Data representing image information, a clock signal CK for synchronization, a horizontal synchronization signal Hsyn, and a vertical synchronization signal Vsyn from an external signal source of the display panel 11 , and outputs a gate output for controlling the scan drive circuit 12 The control signal Cg, the source output control signal Cs for controlling the data drive circuit 31, and the image data Data representing image information.

The scan drive circuit 12 receives the gate output control signal Cg output from the display control circuit 14, and outputs a scan signal to each of the scan lines G1 to Gn. The data driving circuit 11 receives the source output control signal Cs output from the display control circuit 14 and outputs, to the data lines D1 to Dm, image data Data for driving the display elements to perform image display in the pixel units 15 of the display panel 13 . The image data supplied to the display panel 13 is a voltage of an analog signal. The scan driver circuit 12 outputs a scan signal, and the data driver circuit 11 outputs an image signal, and a voltage corresponding to the driving image voltage can be applied to the pixel unit 15 to drive the display element to display an image.

Please refer to FIG. 3 , which is a detailed block diagram of the display control circuit 14 shown in FIG. 2 .

The display control circuit 14 includes a synchronization control signal generation circuit 141 , a data display arrangement circuit 142 and a compensation correction circuit 143 .

The synchronization control signal generation circuit 141 receives the image data Data, the clock signal CK, the horizontal synchronization signal Hsyn, and the vertical synchronization signal Vsyn, and outputs an image signal Data representing a display image and an image signal Data for supplying to the data line driving circuit 31 .

The data display arrangement circuit 142 sorts the image data Data correspondingly according to the pixel units 15 in the display panel 13 , so as to load the image data Data into each pixel unit 15 of the display panel 13 according to the scanning timing of the scan signal.

The compensation correction circuit 143 stores a compensation correction table (look up table, LUT), and the compensation correction circuit 143 performs compensation correction for the image signal Data according to the compensation correction table, wherein the compensation correction table includes a plurality of correction data, and the correction correction The data is used to correct insufficient charging rate and inconsistent charging rate due to resistive delay effect (RC effect) on the data line.

In this embodiment, the data display arrangement circuit 142 and the compensation correction circuit 143 do not need to set other enabling modules, thereby effectively simplifying the modules for constructing the compensation correction table.

Please refer to FIG. 4 , which is a schematic diagram of the layout of the pixel units in the display panel shown in FIG. 2 .

As shown in FIG. 4 , when the resolution of the display panel 13 is n*m, the number of scan lines of the display panel 13 is n, the number of data lines is m, and n*m matrixes are formed Arranged pixel units 15. The three adjacent pixel units 15 in the same row respectively emit light of different colors to form an imaging pixel unit DP. In this embodiment, the three pixel units 15 respectively emit red light (R) and green light (G) And the pixel unit of the blue light (B), that is, an imaging pixel unit DP includes three pixel units of R, G, and B.

In other embodiments of the present application, the number and position of pixel units in the imaging pixel unit DP can be adjusted according to actual needs. For example, the imaging pixel unit DP may also include four types of pixel units: R, G, B, and W, where W It is a pixel unit that emits white light.

The data display arrangement circuit 142 correspondingly sorts the n*m pieces of image data Data according to the pixel units 15 in the display panel 13 into: data D11-D1m corresponding to the output scan signal of the first scan line G1; corresponding to the second scan line G2 The data D21˜D2m of output scan signals, .

If the image data received by the pixel unit 15 formed by the intersection of the data line Di and the scan line Gj is positive (+), and the image data received by the pixel unit 15 formed by the intersection of the data line Di and the scan line Gj+1 is positive (+) ), then, the display panel 13 is defined as the same polarity panel at this time. In this embodiment, as shown in FIG. 4 , the pixel units 15 included in the display panel 13 are driven by dot inversion, that is, the polarities of the image data received by any pixel unit and other surrounding pixel units are different. For example, Say, the polarity of the image data Data received by the pixel unit Pji is +, the pixel unit P(j-1)1, the pixel unit Pj(i-1), the pixel unit Pj(i+1), the pixel unit P(j+1 ) The polarity of the image data Data received by i is -.

4, the scanning display process of the display panel 13 is described in detail,

In the jth scan period, when the scan line Gj is loaded with a scan signal, the data line Di is loaded with image data Data to the pixel unit Pji. Among them, j is a natural number greater than 1 and less than n, and i is a natural number greater than 1 and less than m.

In the j+1th scan period, when the scan line Gj+1 is loaded with a scan signal, the data line Di+1 is loaded with image data Data to the pixel unit Pj(i+1).

In the j+2 th scan period, when the scan line Gj+2 is loaded with a scan signal, the data line Di is loaded with image data Data to the pixel unit Pj(i+2). Wherein, the image data Data loaded into the pixel unit P(j+2)i will be corrected and compensated according to the Data loaded into the pixel unit Pji. This display method is called Line Overdrive (LineOD) technology, that is, in two adjacent pixel units located on the same data line, the grayscale value of the image data received by the pixel unit in the previous row is different from the grayscale value of the image data received by the current pixel unit. If the grayscale value of the image data is compensated, then the voltage corresponding to the grayscale value received by the pixel unit of the current row is compensated, so as to solve the problem of insufficient charging rate of the pixel unit.

In this embodiment, for the pixel unit formed by the scan line Gj and the scan line Gj+2 connected to the same data line Di, the pixel unit Pji and the pixel unit P(j+2)i are connected to the same data line Di, and the two pixel units are respectively connected to the scan line Gj and the scan line Gj+2, then the pixel unit Pji and the pixel unit P(j+2)i are in two adjacent scan lines for the same scan line Di The cycle is scanned, and the pixel unit Pji is in the previous scan cycle, and the pixel unit P(j+2)i is in the next scan cycle, so for the pixel unit formed by the data line Di, the scan line Gj and the scan line Gj+2 Said, the pixel unit Pji is defined as the compensation reference pixel unit, and the pixel unit P(j+2)i is the current pixel unit.

Since the liquid crystal is driven by AC, that is, the polarity corresponding to the image data Data loaded by the pixel unit is opposite to the polarity of the previous frame of image data Data stored by the pixel unit. In order to quickly complete the charging of the pixel unit, the precharge circuit function can be enabled. , the scanning signal of the next row is loaded in advance, and the pixel unit of this row is changed to the polarity voltage of the loaded image data of the current frame in advance under the control of the data voltage. In other words, when the scan line Gj is loaded with the scan signal and the scan line Gj+2 also starts to load the scan signal, part of the voltage is loaded to the pixel unit in advance, so as to control the pixel unit to quickly switch to the opposite polarity. Such a display The technology is pre-Charge.

In this embodiment, for the same data line, in two adjacent rows of pixel units, if the polarity of the received image data is the same, the liquid crystal display panel is defined as the same polarity panel. If the received image data has the same polarity If the polarity is opposite, the liquid crystal display panel is defined as an opposite polarity panel.

For example, please refer to FIG. 5 , which is a schematic diagram of the distribution of pixel units in the display panel shown in FIG. 2 according to the second embodiment of the present application. As shown in FIG. 5 , for the adjacent two rows of pixel units formed by the data line Di and the scanning lines Gj and Gj+1, as shown in FIG. 5 , for the phase formed by the data line Di and the scanning lines Gj and Gj+1 In the adjacent two rows of pixel units, if the image data received by the pixel unit 15 formed by the intersection of the data line Di and the scan line Gj is positive (+), and the pixel unit 15 formed by the intersection of the data line Di and the scan line Gj+1 receives the image data. The image data of is negative polarity (-), then, the display panel 13 is defined as a different polarity panel at this time.

5, the scanning display process of the display panel 13 is described in detail,

In the jth scan period, when the scan line Gj is loaded with the scan signal, the data line Di is loaded with image data Data to the pixel unit Pji. The polarity of i is opposite.

In the j+1th scan period, when the scan line Gj+1 is loaded with a scan signal, the data line Di+1 is loaded with image data Data to the pixel unit P(j+1)i.

In the j+2th scan period, when the scan line Gj+2 loads the scan signal, the data line Di loads the image data Data to the pixel unit P(j+2)i, and then the pixel unit P(j+2)i loads the image data Data will be compensated and corrected according to the Data loaded into the pixel unit Pji. For the pixel unit formed by the data line Di, the scan line Gj and the scan line Gj+2, the pixel unit Pji is still defined as the compensation reference pixel unit, and the pixel unit P(j+2)i is the current pixel unit.

Please refer to FIG. 6 , which is a functional block diagram of the compensation correction table setting system for setting the charging rate corresponding to the third embodiment of the present application. As shown in FIG. 6 , the compensation correction table setting system 100 includes an auxiliary system 101 and a liquid crystal display device 10, wherein the auxiliary system 101 includes a detection module 101a and a compensation analysis module 101b, and the liquid crystal display device 10 includes a display control circuit 14 and Display panel 13 .

Among them, the auxiliary system 101 is a device independent of the liquid crystal display device 10 . The detection module 101a is connected to the compensation analysis module 101b and performs signal transmission, wherein the detection module 101a is used to detect the chromaticity coordinates (x, y) and the luminance value Lv when performing image display within a preset area of the display panel 13 , to obtain the image detection data and transmit it to the compensation analysis module 101b.

The compensation analysis module 101b is used for constructing image data corresponding to the preset detection screen, and automatically calculates and obtains a complementary look-up table according to a preset algorithm. In this embodiment, the look-up table is a look-up table used by the corresponding row-level driver.

In this embodiment, the image data corresponding to constructing the preset detection picture is the grayscale value of a plurality of sub-pixels provided to each pixel unit. For example, corresponding to n*m pixel units 15, in the constructed preset image Image data Data can be described as:

The data D11-D1m of the scan signal are output in the first scan period corresponding to the first scan line G1;

Corresponding to the second scanning line G2, the data D21-D2m of the scanning signal are output in the second scanning period;

...;

The data Dn1 to Dnm of the scan signal are output in the nth scan period corresponding to the nth scan line Gn.

Three RGB pixels that emit light of different colors form an imaging unit, and the grayscale values of the three RGB pixels acquire data D11 to D1m in order of position.

For example, for the pixel unit 15 corresponding to the first scan line G1 , the RGB components are D11 , D12 , and D13 respectively.

In this embodiment, the detection module 101a is a color analyzer, and the detection module can use color analyzers of models CA310 and CA410. Of course, in other embodiments, the detection module 101a can also use other types of color analyzers, The aforementioned models are not limiting. In this embodiment, the compensation analysis module 101b is a software program running on a server or a computer.

The display control circuit 14 is a System on Chip (SOC)/Timer Control Registe (TCON) chip (SOC/TCON) for supporting the liquid crystal display panel 13 to perform automatic correction of the charging rate.

Please refer to FIG. 7 , which is a schematic flowchart of constructing a charging rate compensation correction table LUT using the compensation correction table setting system 100 shown in FIG. 6 in the fourth embodiment of the present application.

Step 001: The compensation analysis module 101b establishes an initial and linear compensation correction table.

Please refer to FIG. 8 , which is a schematic diagram of the linear compensation correction table constructed in step 001 as shown in FIG. 7 . As shown in FIG. 8 , in this embodiment, the abscissa X of the compensation correction table represents: for any data line Di and a scan line, the grayscale value corresponding to the previous pixel unit in the two adjacent rows of pixel units formed by the data line Di and the scan line X0, the ordinate Y represents the grayscale value Y0 corresponding to the current line (Current), and the intersection of the abscissa and the ordinate is the correction value for the grayscale value of the current line. The initial and linear compensation correction table is that any compensation value is the grayscale value of the current row.

For example, for position a in the linear compensation table, the previous line grayscale value X is 32, the current line grayscale value Y is 64, then the corrected grayscale value for the current line grayscale value is 64. What needs to be said here is that the linear compensation table is the grayscale value for which no correction is performed at all.

For position b in the linear compensation table, the input of the previous row corresponding to position b is X (64), and the output corresponding to the current row (Current) is Y (64). Among them, the grayscale values of positions a and b in the middle are reversed with each other, which is called a symmetrical relationship.

Then the positions a, b can be corrected by building the same preset pattern. This effectively reduces the number of corrections. In terms of distance, the linear correction data table shown in Figure 5 contains 7*7 compensation correction values. Then, by performing corrections for positions a and b at the same time, only 7*7/2 corrections are required to complete the linearity. The correction of all the compensation correction values in the correction data table effectively improves the correction efficiency and reduces the correction complexity.

The corresponding correction compensation relationship between the compensation correction table and the image data received by the pixel unit in the display panel 13 will be described in detail with reference to FIG. 5 and FIG. 8 .

As shown in FIG. 5 , the data line D1 and the scan lines G1 and G3 intersect to form two adjacent rows of pixel units P11 and P31 for the data line D1 as an example, wherein the pixel unit P31 is the current pixel unit, The grayscale value of the received image data corresponds to the pixel unit of the current row in the ordinate in the compensation correction table, the pixel unit P11 is used as the compensation reference pixel unit, and the grayscale value of the received image data is used as the pixel of the previous row in the abscissa. unit. In this embodiment, the abscissa X in the compensation correction table is the grayscale value of the image data corresponding to the pixel unit in the previous row, and the abscissa Y in the compensation correction table is the grayscale value of the image data corresponding to the pixel unit in the current row value.

In this embodiment, the grayscale value X of the image data Data-P31 loaded into the pixel unit P31 is 64, and the image data Data-P11 loaded into the pixel unit P11 is 32, then the corrected and compensated image data Data-P31 has The position is the grayscale value corresponding to the position a shown in FIG. 8 .

It should be noted that since the charging rates in each pixel unit in the display panel 14 are different, the correction value corresponding to each grayscale value is different. Therefore, in this embodiment, it is necessary to target each pixel as shown in FIG. 6 . The correction values construct a preset correction screen for correction.

In this embodiment, the step size of the abscissa and the ordinate is 32 grayscale values. In other embodiments of the present application, the step size of the abscissa and the ordinate may also be 16 grayscale values. Alternatively, the grayscale value corresponding to the step size may also be 8, 64, etc., wherein the step size is The grayscale value corresponds to the compensation fineness of the charging rate corresponding to the pixel unit and the requirements for the uniformity of image display. When the compensation fineness of the pixel unit corresponding to the charging rate and the image display uniformity are lower, the grayscale value corresponding to the step size is larger.

Step 002: The compensation analysis module 101b constructs a preset image (Patten) according to the initial compensation correction table. The preset image is the grayscale value provided to all pixel units P11 ˜Pnm in at least one frame of image of the display panel 13 .

Please refer to FIG. 9 , which is a schematic diagram of the image display data matrix constructed in step 002 as shown in FIG. 7 . In this embodiment, the schematic diagram of the image display data matrix is an image display data matrix constructed according to the same polarity panel shown in FIG. 3 .

For the position a shown in FIG. 5 , in the schematic diagram of the constructed display data matrix, the input for position a corresponding to the previous row (Previous) is X (32), and the output corresponding to the current row (Current) is Y (80).

In this embodiment, the input of the previous row (Previous) corresponding to the position b is Y (80), and the output corresponding to the current row (Current) is X (32). The grayscale values in positions a and b are reversed with each other, which is called a symmetrical relationship. Therefore, the positions a and b can be corrected using the same preset picture.

In the preset pattern, the RGB components in each pixel unit may be (X, Y, Y), (Y, X, Y), (Y, Y, X), (Y, X, X,), ( Any one of X, Y, X) and (X, X, Y), that is, the RGB components in each pixel unit can be (32, 64, 64), (64, 32, 64), (64, 64, 32), (64,32,32,), (32,64,32) and (32,32,64).

As shown in FIG. 9 , for the three RGB sub-pixels in each pixel unit 15 , the grayscale values are 32, 64, and 64. Then, for a liquid crystal display panel with a resolution of n*m, the preset display image formed corresponds to the pixel units P11, P12, P13..., P1n,..., Pnm, and the grayscale values are: 32, 64, 64 , 32, 64, 64, 32, 64, 64, 32, 64, 64, ... 32, 64, 64.

Step 003: The compensation analysis module 101b determines a target value (xt, yt, Lvt) corresponding to a charging rate of 100% in each preset image. Among them, xt, yt is the chromaticity coordinate value in XYZ chromaticity space.

Please refer to FIG. 10 , which is a schematic flowchart of determining the target value in step 003 as shown in FIG. 7 .

Taking the same-polarity panel arrangement as an example, the present application proposes an objective standard for evaluating the charging rate of a liquid crystal panel to obtain target values (xt, yt, Lvt) of each preset pattern. Proceed as follows:

Step 0031: Detect the white gamma curve of the preset position of the display panel 13 by the detection module 101a, and detect the chromaticity coordinates and luminance (x, y, Lv) of a single color picture of the three primary colors when the picture is at the maximum luminance. Among them, the three primary colors are red, green and blue.

In this embodiment, the preset position of the display panel 13 is the position of the center point of the display panel 13 , and the white point Gamma curve is the brightness curve of each preset pattern.

Step 0032: Perform a Degamma operation on the preset image according to the white-point gamma curve to obtain normalized RGB luminance values. Among them, RGB is the luminance component of the red, green and blue primary color light in the image.

Wherein, performing the Degamma operation on the preset image is performed according to the guidance of the white point Gamma curve detected in step 0031, that is, performing nonlinear to linear processing (Degamma) on the Pattern according to the white point brightness curve.

For example, the normalized brightness corresponding to the preset pattern with the RGB grayscale value of (0, 0,0) in the imaging pixel unit DP is 0, and the preset pattern with the RGB grayscale value of (255, 255, 255) in the imaging pixel unit DP corresponds to The normalized brightness is 1, and the normalized brightness corresponding to the preset pattern with the RGB grayscale value in the imaging pixel unit DP is (128,128,128) is 0.40, correspondingly, the RGB grayscale value in the imaging pixel unit DP is (0,128,128) After performing the Degamma operation on the preset image, the normalized RGB luminance value is (0, 0.4, 0.4).

Step 0033: Execute the color gamut conversion from the RGB luminance value to XYZ to obtain the XYZ chromaticity coordinate value of the normalized XYZ color space.

Step 0034: Quantize the normalized XYZ chromaticity coordinate values.

Specifically, in this embodiment, the specific quantization method may be, for example:

Lvmax=300nit, Lvmin=0.2nit; wherein, Lvmax=300nit is the maximum brightness of the white screen, and Lvmin=300nit is the minimum brightness of the white screen.

X_qua=X_nor*(Lvmax-Lvmin)+Lvmin;

Y_qua=Y_nor*(Lvmax-Lvmin)+Lvmin;

Z_qua=Z_nor*(Lvmax-Lvmin)+Lvmin.

Among them, X_qua, Y_qua and Z_qua are XYZ chromaticity coordinate values after normalization.

In this embodiment, the white point picture is that the grayscale values of the three pixel units RGB in each imaging pixel unit DP are (255, 255, 255) or (0, 0, 0), and the normalized XYZ chromaticity coordinate values The real brightness value is achieved by quantization, so that the target value can be compared with the actual detection value.

Step 0035: Convert the quantized XYZ value to (x, y, Lv) to obtain the target value (xt, yt, Lvt).

In this embodiment, each preset image corresponds to a target value (xt, yt, Lvt), and the target value (xt, yt, Lvt) is the standard color that should be achieved when the charging rate of each pixel unit is 100% Degree coordinate value and brightness value.

The detection module 101a measures the original (x, y, Lv) of each preset image without correction and compensation, and describes the charging rate of the liquid crystal display panel 13 according to the following formula (1). The effect of the RC resistance in the middle leads to different (x, y, Lv) in different regions, and the charging rate is also different.

Step 004: The compensation analysis module 101b calculates the compensation value update amount corresponding to each correction value in the compensation correction table according to the target value and the convergence algorithm, and updates the compensation correction table according to the compensation value update amount Δ.

Among them, the compensation value update amount △ can be calculated by formula (2), where (xt, yt, Lvt) is the target value, (xi, yi, Lvi) is the measured value, and a set of coefficients from a11 to ann are used as coefficients The a11～ann are determined in advance according to the empirical value.

Please refer to FIG. 11 , which is a schematic diagram of the compensation correction table after compensation and correction in step 004 as shown in FIG. 7 .

As shown in FIG. 9 , after correction, for position a and position b, position a is corrected to 66 corresponding to the current line grayscale value 64, and position b is corrected to 29 for the current line grayscale value 32.

Step 005: The compensation analysis module 101b transmits the preset pattern to the data display arrangement circuit 142 to arrange the image data, and the calibration compensation circuit 143 searches the compensation correction table for the corrected grayscale value according to the row-level overdrive technique, and The corrected gray-scale value obtained after searching is used to replace the current gray-scale value as the current image display data, and is output to the corresponding pixel unit 15 in the display panel 14 for image display.

Step 006: Control the detection module 101a to measure the chromaticity coordinates (x, y) and the luminance value Lv of the image displayed in the preset area on the display panel 14, and confirm whether the detection value (x, y, Lv) is within the target value (xt,yt,Lvt) within a specific range.

When the detected value (x, y, Lv) is within the range of the target value (xt, yt, Lvt), the grayscale value is corrected;

When the detected value (x, y, Lv) exceeds the range of the target value (xt, yt, Lvt), steps 004 to 005 are repeated.

Step 007: Repeat steps 001 to 006 for each position in the linear table and when the chromaticity coordinates and luminance (x, y, Lv) of the image data corrected by the compensation value both reach the target range (xt, yt, Lvt) , and get the compensation correction table after the correction is completed.

It can be understood that, for each position in the compensation correction table LUT, the aforementioned steps 001 to 006 are performed once, and the correction values of all positions as shown in FIG. 11 can be obtained, thereby completing the construction of the compensation correction table.

Please refer to FIG. 12 , which is a schematic diagram of a flow chart of constructing a compensation table for an opposite polarity panel according to the fifth embodiment of the present application.

Step 010, constructing an opposite polarity compensation correction table.

Step 011 , for any pixel unit of the opposite polarity in the opposite polarity panel, the compensation analysis module 101b constructs a preset image according to the initial compensation correction table.

Please refer to FIG. 13 , which is a schematic diagram of the image display data matrix constructed in step 011 as shown in FIG. 12 .

For the position a shown in Figure 5, in the schematic diagram of the constructed display data matrix, the input of position a corresponding to the previous row (Previous) is X (32), and the output corresponding to the current row (Current) is Y (80). Then the input of the previous line (Previous) corresponding to position b is Y (80), and the output corresponding to the current line (Current) is X (32). The grayscale values in positions a and b are reversed with each other, which is called a symmetrical relationship.

In the preset image, a basic image area CE is constructed, and the basic image area includes k*3 pixel units, that is, includes k*1 imaging pixel units DP. Wherein, three adjacent pixel units in the same row are respectively used as RGB in one imaging pixel unit DP, and the grayscale values of RGB are the same. In this embodiment, k is 4, and for the 4 pixel units in the same column, the grayscale value can be any one of (X, Y, Y, X) and (Y, X, X, Y), That is, the RGB components in each pixel unit can be any one of (32, 64, 64, 32) and (64, 32, 32, 64).

As shown in Figure 13, in the construction of a basic image area, for 4*3 RGB sub-pixels, the grayscale values are 32, 32, 32; 64, 64, 64; 64, 64, 64; 32, 32, 32 . Arranged in matrix form is:

32,32,32;

64,64,64;

32,32,32.

Or in other embodiments of the present application, in constructing a basic image area, for 4*3 RGB sub-pixels, the grayscale values are 64, 64, 64; 32, 32, 32; 32, 32, 32; 64, 64,64. Arranged in matrix form is:

64,64,64;

32,32,32;

64,64,64.

Then, for a liquid crystal display panel with a resolution of n*m, in the preset display image formed, the image data formed by the grayscale values of n/4 basic image areas along the column direction includes Image data consisting of grayscale values of m/3 basic image regions.

In other embodiments of the present application, the basic image area CE includes k*3h pixel units, that is, includes k*1 imaging pixel units DP, that is, includes k*h imaging pixel units DP, and both k and h are greater than 1. Natural number. In the preset display image formed, the image data formed by the grayscale values of n/4 basic image areas along the column direction, and the image formed by the grayscale values of m/3h basic image areas along the column direction data.

Step 012: Determine a target value (xt, yt, Lvt) corresponding to a charging rate of 100% in each preset image for the pixel units with different polarity in the different polarity panel.

In this embodiment, in the initial linear compensation and correction table, the corresponding compensation and correction values of the same gray-scale value of the abscissa and the ordinate, that is, the compensation and correction values of the diagonal positions in the compensation and correction table, construct a white point picture ( White picture), such as constructing a preset picture with the grayscale value of RGB in each imaging pixel unit DP (32, 32, 32) and outputting it to the display panel, manually adjusting the compensation correction value of the diagonal position, wherein after The white point picture corrected by the compensation correction value has no Fine Pitch phenomenon visually, that is, there is no uneven brightness of sub-pixels visually.

The steps of compensating the target value of the preset image corresponding to the compensation correction value of the off-diagonal position in the correction table can be calculated by adopting steps 0031 to 0035 .

Step 013: The compensation analysis module 101b calculates the compensation value update amount Δ corresponding to each correction value in the compensation correction table according to the target value and the convergence algorithm, and updates the compensation correction table according to the compensation value update amount Δ.

Step 014: The preset pattern is transmitted to the data display arrangement circuit 142 through the compensation analysis module 101b to arrange the image data, and the correction and compensation circuit 143 searches for the corrected grayscale value in the compensation correction table according to the row-level overdrive technique, And replace the current gray-scale value with the corrected gray-scale value obtained after the search as the current image display data, and output it to the corresponding pixel unit 15 in the display panel 14 for image display.

Step 015: Control the detection module 101a to measure the chromaticity coordinates (x, y) and the luminance value Lv of the image displayed in the preset area on the display panel 14, and confirm whether the detection value (x, y, Lv) is within the target value (xt,yt,Lvt) within a specific range.

Step 016: Repeat steps 011 to 015 for each position in the linear table and when the chromaticity coordinates and luminance (x, y, Lv) of the image data corrected by the compensation value both reach the target range (xt, yt, Lvt) , and obtain the corrected heteropolarity compensation correction value after the correction is completed.

By repeating steps 011 to 016, each compensation correction value in the initialized compensation correction table is corrected to obtain a corrected heteropolarity compensation correction table.

Step 020, constructing a same-polarity compensation correction table.

Step 021: Constructing a preset image for the pixels of the same polarity in the opposite polarity panel.

Please refer to FIG. 14 , which is a schematic diagram of the image display data matrix constructed in step 021 as shown in FIG. 12 .

For the position a shown in Figure 5, in the schematic diagram of the constructed display data matrix, the input of position a corresponding to the previous row (Previous) is X (32), and the output corresponding to the current row (Current) is Y (80). Then the input of the previous line (Previous) corresponding to position b is Y (80), and the output corresponding to the current line (Current) is X (32). The grayscale values in the positions of a and b are reversed with each other, which is called a symmetrical relationship.

In the preset image, a base image area is constructed, and the base image area includes k*3 pixel units, that is, includes k*1 imaging pixel units DP. Wherein, three adjacent pixel units in the same row are respectively used as RGB in one imaging pixel unit DP, and the grayscale values of RGB are the same.

In this embodiment, k is 4, and for the 4 pixel units in the same column, the grayscale value can be any one of (X, X, Y, Y), (Y, Y, X, X), That is, the RGB components in each pixel unit can be any one of (32, 32, 64, 64) and (64, 64, 32, 32).

As shown in Figure 14, in the construction of a basic image area, for 4*3 RGB sub-pixels, the grayscale values are 32, 32, 32; 32, 32, 32; 64, 64, 64; 64, 64, 64 .

As shown in Figure 14, in the construction of a basic image area, for 4*3 RGB sub-pixels, the grayscale values are 32, 32, 32; 32, 32, 32; 64, 64, 64; 64, 64, 64 . Arranged in matrix form is:

32,32,32;

64,64,64;

64,64,64.

Or in other embodiments of the present application, in the construction of a basic image area, for 4*3 RGB sub-pixels, the grayscale values are 64, 64, 64; 64, 64, 64; 32, 32, 32; 32, 32,32. Arranged in matrix form is:

64,64,64;

32,32,32;

32,32,32.

Then, for a liquid crystal display panel with a resolution of n*m, the formed preset display image is image data formed by grayscale values of x/4 basic image areas.

Step 022 : Determine a target value (xt, yt, Lvt) corresponding to a charging rate of 100% in each preset image for pixel units of the same polarity in the opposite polarity panel. The steps of the target value of the preset image corresponding to the compensation correction value in the compensation correction table can be calculated by adopting steps 0031 to 0035 .

Step 023 : Calculate the update amounts ΔY and ΔX of the compensation values corresponding to the positions a and b of the LUT table according to the target value and the convergence algorithm for the pixels of the same polarity in the different polarity panel, and update them to Y and X.

Step 024: The preset pattern is transmitted to the data display arrangement circuit 142 through the compensation analysis module 101b to arrange the image data, and the calibration compensation circuit 143 searches for the corrected grayscale value in the compensation correction table according to the row-level overdrive technique, And replace the current gray-scale value with the corrected gray-scale value obtained after the search as the current image display data, and output it to the corresponding pixel unit 15 in the display panel 14 for image display.

Step 025: Control the detection module 101a to measure the chromaticity coordinates (x, y) and the luminance value Lv of the image displayed in the preset area on the display panel 14, and confirm whether the detection value (x, y, Lv) is within the target value (xt,yt,Lvt) within a specific range.

Step 026: Repeat steps 021 to 025 for each position in the linear table and when the chromaticity coordinates and luminance (x, y, Lv) of the image data corrected by the compensation value both reach the target range (xt, yt, Lvt) , and get the same-polarity compensation correction table that has been corrected.

Please refer to FIG. 15 , which is a schematic diagram of the same-polarity compensation correction table and the same-polarity compensation correction table after compensation and correction after step 025 as shown in FIG. 12 .

As shown in Figure 15, after correction, in the same polarity compensation correction compensation table, for position a and position b, the grayscale value 64 for the current line in position a is corrected to 68, and the grayscale value for the current line in position b is corrected to 68 The step value 32 is corrected to 35.

It can be understood that, for each position in the compensation correction table, the foregoing steps 021 to 026 are performed once to obtain the correction values of all positions as shown in FIG. 15 , thereby completing the construction of the compensation correction table.

With reference to FIG. 15 and FIG. 2 to FIG. 3 , the process of correcting the display panel 13 during image display is described in detail:

The image data Data to be displayed is transmitted to the synchronization control signal generation circuit 141 by the external equipment or other modules of the display device, and the data display arrangement circuit 142 sorts the image data Data correspondingly according to the arrangement order of the pixel units 15 in the display panel 13 , the compensation correction circuit 143 performs correction according to the compensation correction table for each image data Data.

For the heteropolar pixel units in the heteropolar panel, the specific correction process is as follows:

The compensation and correction circuit 143 identifies the display position of the current image data Data on the display panel, that is, identifies which scan line the current image data Data is to be loaded into the data line during scanning, and which data line D needs to be loaded through.

For example, if the grayscale value (image data Data) loaded into the pixel unit Pji is 64, the compensation and correction circuit 143 confirms that the grayscale value loaded into P(j-2)i is 32, and the compensation and correction circuit 143 differentiates itself The polarity compensation correction table LUT finds the correction value 68 corresponding to the horizontal and vertical coordinates of (32, 64). Therefore, the compensation correction circuit 14 takes the correction value 68 as the compensated grayscale value and replaces the input grayscale value 64.

By analogy, after the correction of the grayscale value loaded into each pixel unit in the display panel is completed, the corrected image data Data is loaded into each pixel unit 15 of the display panel 13 according to the scanning timing of the scan signal. middle.

For the heteropolar pixel units in the heteropolar panel,

For example, if the gray-scale value (image data Data) loaded into the pixel unit Pji is 64, the compensation and correction circuit 143 confirms that the gray-scale value loaded into P(j-2)i is 32, and the compensation and correction circuit 143 is the same The polarity compensation correction table LUT finds the correction value 66 corresponding to the horizontal and vertical coordinates of (32, 64). Therefore, the compensation correction circuit 14 takes the correction value 66 as the compensated grayscale value and replaces the input grayscale value 64.

In this embodiment, a preset image is automatically constructed by each compensation and correction value in the initialized compensation and correction table, and a target value satisfying the preset charging rate is determined, and the corresponding compensation and correction value in the automatic correction is performed according to the preset image and the target value. , which effectively improves the efficiency and accuracy of constructing the compensation correction table.

The above are the preferred embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can be made. The protection scope of this application.

Claims

A method for constructing a compensation correction table in a liquid crystal display device, the liquid crystal display device comprising a liquid crystal display panel, the display panel comprising a plurality of pixel units arranged in a matrix, the plurality of pixel units including a current pixel unit and a A compensation reference pixel unit, the current pixel unit and the compensation reference pixel unit receive image data from the same data line, and are scanned in two adjacent scanning periods, wherein the construction method includes:

establishing an initial and linear compensation correction table, the compensation correction table includes a plurality of compensation correction values, each of the compensation correction values corresponds to the image data received by the current pixel unit and the compensation reference pixel unit;

A preset image is constructed corresponding to the number of images received by the current pixel unit and the compensation reference pixel unit corresponding to any compensation correction value in the initial compensation correction table, and the preset image is at least one image provided to the display panel of the liquid crystal. The grayscale value of all pixel units in the frame image;

determining a target value corresponding to the preset charging rate in each preset image, where the target value includes target chromaticity coordinates and luminance values when the image is displayed;

Calculate the compensation value update amount corresponding to each compensation correction value in the compensation correction table according to the target value and adopt a convergence algorithm, and update the compensation correction table according to the compensation value update amount;

Look up the compensation correction value in the compensation correction table for the position of the pixel unit to be loaded for each image data, and replace the image data with the compensation correction value obtained by searching, and output the corrected image data to the The pixel unit corresponding to the display panel performs image display;

Detecting the chromaticity coordinates and luminance values of the image displayed in the preset area of the display panel to obtain a detection value, and confirming whether the detection value is within the preset range of the target value, when the detection value is within the target value within the range, the compensation correction value completes the correction,

When the detected value exceeds the target value range, the compensation correction value is adjusted according to the detected value and the target value adjustment, and the image data is corrected and displayed according to the adjusted compensation correction value. When the detected value is within the target value range, the correction is completed.
The construction method of compensation correction table according to claim 1, is characterized in that:

In the linear compensation correction table, the first direction coordinate represents the image data corresponding to the compensation reference pixel unit, the second direction represents the image data corresponding to the current pixel unit, and the first direction coordinate and The intersection position of the second direction coordinate represents the compensation correction value of the image data corresponding to the current pixel unit, wherein the compensation correction value in the linear compensation correction table is the same as the image data corresponding to the current pixel unit.
The construction method of compensation correction table according to claim 2, is characterized in that:

The display panel includes a plurality of scanning signal lines extending along a first direction and a plurality of data lines extending along a second direction to form a plurality of pixel units arranged in a matrix, the first direction and the second direction Vertically, the plurality of scan lines respectively provide scan signals to the pixel units in each scan period according to the scan timing, the data lines are used for providing image data to the pixel units in each scan period, the current The polarity of the image data received by the pixel unit and the compensation reference pixel unit is the same,

In the preset pattern, the image data of three pixel units that emit light of different colors in each imaging pixel unit are (X, Y, Y), (Y, X, Y), (Y, Y, X), Any one of (Y,X,X,), (X,Y,X) and (X,X,Y), the X is the image data received by the compensation reference pixel unit, and the Y is the current pixel Image data received by the unit.
The construction method of compensation correction table according to claim 1, is characterized in that:

The display panel includes a plurality of scanning signal lines extending along a first direction and a plurality of data lines extending along a second direction to form a plurality of pixel units arranged in a matrix, the first direction and the second direction Vertically, the plurality of scan lines respectively provide scan signals to the pixel units in each scan period according to the scan timing, the data lines are used for providing image data to the pixel units in each scan period, the current The polarity of the image data received by the pixel unit and the compensation reference pixel unit is opposite,

A heteropolarity compensation correction table is constructed for the heteropolar pixel units in the display panel, and a homopolarity compensation correction table is established for the homopolarity pixel units in the display panel, and the heteropolarity pixel units are for In the pixel units of the same column, the pixel units of the opposite polarity to the image data received by the pixel units of the previous row, the pixel units of the same polarity are the pixel units of the same column, and the image data received by the pixel units of the previous row. Pixel cells with the same polarity.
The method for constructing a compensation correction table according to claim 4, wherein when the polarities of the image data received by the current pixel unit and the compensation reference pixel unit are opposite, the opposite polarity compensation correction table is constructed After completion, construct the same polarity compensation correction table.
The method for constructing a compensation correction table according to claim 5, wherein when constructing the heteropolarity compensation correction table, the preset pattern includes a plurality of basic image areas, and the basic image area includes j* 1 imaging pixel unit, wherein, in each imaging pixel unit, there are three pixel units that emit light of different colors, and the image data of the three pixel units that emit light of different colors in each imaging pixel unit are the same, and the j imaging pixels In the image data of the unit, the image data of two adjacent pixel units with opposite polarity are X and Y respectively, where X is the image data received by the compensation reference pixel unit, and Y is the image data received by the current pixel unit.
The construction method of compensation correction table according to claim 6, is characterized in that:

The j is 4, the basic image area includes 4*1 imaging pixel units, wherein the first polarity is positive polarity, and the second polarity is negative polarity, and the 4*1 imaging pixel units The image data is:

X,X,X;

Y, Y, Y;

Y, Y, Y;

X,X,X; or

Y, Y, Y;

X,X,X;

X,X,X;

Y, Y, Y.
The method for constructing a compensation correction table according to claim 7, wherein when constructing the same polarity compensation correction table, the preset pattern includes a plurality of basic image areas, and the basic image area includes j* 1 imaging pixel unit, wherein, in each imaging pixel unit, there are three pixel units that emit light of different colors, and the image data of the three pixel units that emit light of different colors in each imaging pixel unit are the same, and the j imaging pixels In the image data of the unit, the image data of two adjacent pixel units of the same polarity are X and Y respectively, where X is the image data received by the compensation reference pixel unit, and Y is the image data received by the current pixel unit.
The construction method of compensation correction table according to claim 6, is characterized in that:

The j is 4, and the basic image area includes 4*1 imaging pixel units, wherein the first polarity is positive polarity, and the second polarity is negative polarity, and the 4*1 imaging pixel units The image data is:

X,X,X;

X,X,X;

Y, Y, Y;

Y,Y,Y; or

Y, Y, Y;

Y, Y, Y;

X,X,X;

X, X, X.
The method for constructing a compensation correction table according to any one of claims 1-9, wherein the image data is a grayscale value.
The method for constructing a compensation correction table according to claim 10, wherein the determining the target value corresponding to each preset image to reach the preset charging rate comprises:

Detecting the white point gamma curve of the preset value of the display panel, and detecting the color gamut coordinate value and brightness value of the maximum brightness of red, green and blue;

Performing a Degamma operation on the preset image according to the white-field gamma curve to obtain a normalized RGB brightness value, wherein the RGB brightness value is a component of red, green and blue primary color light in the preset image;

Perform RGB luminance value to XYZ color gamut space conversion and obtain the XYZ chromaticity coordinate value of normalized XYZ color gamut space;

quantizing the normalized XYZ chromaticity coordinate values;

The quantized XYZ chromaticity coordinate values are converted into color gamut coordinate values and luminance values to obtain the target value.
The method for constructing a compensation correction table according to claim 11, wherein,

The target value is that when each preset image is displayed on the display panel, the chromaticity coordinate value and the luminance value should be reached when the charging rate of each pixel unit is 100%.
The display calibration table construction method according to any one of claims 1-11, wherein,

When the correction of each compensation correction value in the initial compensation correction table is completed, the composition of the compensation correction table is completed.
A liquid crystal display device, comprising the display panel and the compensation correction table according to any one of claims 3 to 13, and the liquid crystal display device further comprises a data driving circuit, a scanning driving circuit and a display control circuit, the data driving circuit, the compensation correction table is stored in the display control circuit,

The display control circuit is connected to the data driving circuit and the scan driving circuit, and the display control circuit outputs a synchronization signal to the data driving circuit and the scan driving circuit according to the received image data, and provides the compensation and correction table the compensated image data to the data driving circuit;

the scan driving circuit is connected to the plurality of scan lines to provide scan signals to the plurality of scan lines according to scan timing;

The data driving circuit is connected to the plurality of data lines, and is used for converting the image data held and transmitted in the form of grayscale values into corresponding analog voltage values and transmitting them to the pixel unit.