CN115424589B - Brightness adjusting method and device for display panel - Google Patents
Brightness adjusting method and device for display panel Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 description 23
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The application discloses a brightness adjusting method and device of a display panel. The brightness adjusting method comprises the steps of firstly obtaining a first gray scale value of a target sub-pixel to be displayed, obtaining a second gray scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance, then obtaining an association relation between a gray scale difference value and a compensation voltage, determining the compensation voltage of the target sub-pixel based on the first difference value of the first gray scale value and the second gray scale value, and finally compensating the brightness of the target sub-pixel according to the compensation voltage. According to the method and the device, the first gray scale value of the target sub-pixel and the first difference value of the second gray scale value of the reference sub-pixel are compared, so that the brightness of the target sub-pixel is compensated according to the association relation between the gray scale difference value and the compensation voltage, the brightness of the secondary area of the target sub-pixel is increased, the problem of dark bands caused by insufficient brightness of the target sub-pixel is solved, and the problem of jaggy feeling of a picture is further solved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a method and an apparatus for adjusting brightness of a display panel.
Background
The liquid crystal display panel can adopt an 8-domain pixel design, and the display brightness of a main area and a secondary area in each pixel is different through a voltage dividing circuit, so that the display effect of a large viewing angle is improved.
In a part of usage scenarios, such as a game scenario, in order to increase the refresh frequency of the display panel, a DLG (Double Line Gate) mode is adopted, so that the display panel can scan two lines of pixels at the same time, thereby increasing the response speed. In this mode, in the region of the display screen where the gray scale difference is large, the brightness of the sub-regions in the two rows of pixels is significantly lower than that of the main region, forming two dark bands. In the normal driving mode, there is also a problem of a dark band in the sub-region in the pixel. The macroscopic appearance of the dark bands is a jagged image, which affects the display effect of the display panel. How to improve the jaggy feeling of the 8-domain liquid crystal display panel is one of the technical problems that the skilled in the art needs to solve.
Disclosure of Invention
The application provides a brightness adjusting method and device of a display panel, which are used for improving the problem that a picture of an 8-domain liquid crystal display panel has a saw tooth feel.
In order to solve the above problems, the technical scheme provided by the application is as follows:
the application provides a brightness adjusting method of a display panel, comprising the following steps:
Acquiring a first gray scale value of a target sub-pixel to be displayed;
acquiring a second gray scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance;
acquiring an association relation between a gray scale difference value and a compensation voltage, and determining the compensation voltage of the target sub-pixel based on a first difference value of the first gray scale value and the second gray scale value;
and compensating the brightness of the target sub-pixel according to the compensation voltage.
In the brightness adjustment method of the present application, the step of obtaining the first gray-scale value of the target subpixel to be displayed includes:
acquiring the position information of the target sub-pixel;
acquiring a first gray-scale voltage of the target sub-pixel according to the position information;
and acquiring a first gray scale value of the target sub-pixel according to the gray scale voltage.
In the brightness adjustment method of the present application, the step of obtaining the second gray-scale value of the reference sub-pixel spaced apart from the target sub-pixel by a preset distance includes:
acquiring a driving mode of the display panel;
determining position information of the reference sub-pixels according to a driving mode of the display panel;
and acquiring a second gray scale value of the reference sub-pixel according to the position information.
In the brightness adjustment method of the present application, the step of determining the position information of the reference sub-pixel according to the driving mode of the display panel includes:
when the driving mode of the display panel is a normal driving mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 1, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel;
when the driving mode of the display panel is a double-line scanning mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 2, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel.
In the brightness adjustment method of the present application, the step of obtaining the second gray-scale value of the reference sub-pixel according to the position information includes:
acquiring a second gray scale voltage of the reference sub-pixel according to the position information;
and obtaining a second gray scale value of the reference sub-pixel according to the second gray scale voltage.
In the brightness adjustment method of the present application, the display panel includes a first transistor, a second transistor, and a third transistor, gates of the first transistor, the second transistor, and the third transistor are connected to a scan signal terminal, drains of the first transistor and the second transistor are connected to a data signal terminal, sources of the second transistor and the third transistor are connected to a drain of the third transistor, and sources of the third transistor are connected to a shared voltage terminal;
Wherein, the step of obtaining the association relationship between the gray level difference value and the compensation voltage, and determining the compensation voltage of the target sub-pixel based on the first difference value between the first gray level value and the second gray level value includes:
acquiring the association relation between the gray scale difference value and the compensation voltage;
acquiring a first difference value of the first gray scale value and the second gray scale value;
and determining the compensation voltage of the shared voltage end in the target sub-pixel according to the association relation between the gray scale difference value and the compensation voltage and the first difference value.
In the brightness adjustment method of the present application, the step of obtaining the association relationship between the gray level difference value and the compensation voltage includes:
acquiring a plurality of test panels;
performing multiple tests on the plurality of test panels to obtain gray scale differences and brightness differences of a plurality of sub-pixels of the test panels;
according to the brightness difference value, adjusting the compensation voltage, and recording the compensation voltage when the brightness difference value meets the preset requirement;
and obtaining the association relation between the gray scale difference value and the compensation voltage according to the tested gray scale difference value and the recorded compensation voltage.
In the brightness adjustment method of the present application, the sub-pixel of the display panel includes a main region and a sub-region,
The step of performing multiple tests on the plurality of test panels to obtain gray scale differences and brightness differences of the plurality of sub-pixels of the test panels includes:
testing a plurality of test panels, obtaining a third gray level value of a target sub-pixel of the test panel and a fourth gray level value of a reference sub-pixel spaced apart from the target sub-pixel by a preset interval, and obtaining a third brightness value of a main area of the target sub-pixel and a fourth brightness value of a sub-area of the target sub-pixel;
and acquiring a gray scale difference value of the test panel according to the third gray scale value and the fourth gray scale value, and acquiring a brightness difference value of the test panel according to the third brightness value and the fourth gray scale value.
In the brightness adjustment method of the application, the association relation between the gray scale difference value and the compensation voltage comprises a first association relation, a second association relation, a third association relation and a fourth association relation,
wherein the gray scale range of the first association relation is 0 gray scale to 25 gray scale,
the gray scale range of the second association is 26 gray scales to 128 gray scales,
the gray scale range of the third association is 129 gray scales to 220 gray scales,
the fourth association is in the range of 221 to 255 gray levels,
The step of determining the compensation voltage of the shared voltage terminal in the target sub-pixel according to the association relationship between the gray scale difference value and the compensation voltage and the first difference value includes:
acquiring a first gray scale value of the target sub-pixel;
judging the association relation between the first gray scale value of the target sub-pixel and the gray scale difference value and compensation voltage of each section;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the first association is not empty, setting the compensation voltage as the first compensation voltage in the first association;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the second association is not empty, setting the compensation voltage as a second compensation voltage in the second association;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the third association is not empty, setting the compensation voltage as a third compensation voltage in the third association;
and when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the fourth association is not empty, setting the compensation voltage as a fourth compensation voltage in the fourth association.
The application also provides a brightness adjusting device of a display panel, the brightness adjusting device includes:
A first gray-scale value obtaining unit, configured to obtain a first gray-scale value of a target subpixel to be displayed;
a second gray-scale value obtaining unit, configured to obtain a second gray-scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance;
the compensation voltage determining unit is used for obtaining the association relation between the gray level difference value and the compensation voltage and determining the compensation voltage of the target sub-pixel based on the first difference value of the first gray level value and the second gray level value;
and the compensation unit is used for compensating the brightness of the target sub-pixel according to the compensation voltage.
The beneficial effects are that: the application discloses a brightness adjusting method and device of a display panel; the brightness adjustment method comprises the steps of firstly obtaining a first gray scale value of a target sub-pixel to be displayed, obtaining a second gray scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance, then obtaining an association relation between a gray scale difference value and a compensation voltage, determining the compensation voltage of the target sub-pixel based on a first difference value between the first gray scale value and the second gray scale value, and finally compensating the brightness of the target sub-pixel according to the compensation voltage; according to the method and the device, the first gray scale value of the target sub-pixel and the first difference value of the second gray scale value of the reference sub-pixel are compared, so that the brightness of the target sub-pixel is compensated according to the association relation between the gray scale difference value and the compensation voltage, the brightness of the secondary area of the target sub-pixel is increased, the problem of dark bands caused by insufficient brightness of the target sub-pixel is solved, and the problem of jaggy feeling of a picture is further solved.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating a jaggy appearance of a prior art picture;
FIG. 2 is a flowchart of a brightness adjustment method of a display panel according to the present application;
FIG. 3 is a circuit diagram of a subpixel structure of the display panel of the present application;
FIG. 4 is a graph showing the relationship between gray scale difference and compensation voltage;
FIG. 5 is a schematic diagram of the compensation voltage obtained according to FIG. 4;
fig. 6 is a schematic diagram of a brightness adjusting device of a display panel of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
In the liquid crystal display panel, since the difference in birefringence of liquid crystal molecules is large, there is a difference between the front view angle and the side view angle of the display panel, that is, there is a serious color shift in the large viewing angle. In order to solve the problem, the prior art divides the pixel into a main area and a sub area to form an 8-domain sub-pixel, and different deflection angles are generated on liquid crystal molecules in the main area and the sub area, so that the problem of color cast of a large viewing angle is solved.
In a part of use scenes, such as a game scene, in order to improve the refresh frequency of the display panel, a double-line scanning mode is adopted, and the display panel can scan two lines of pixels at the same time, so that the response speed is improved. In this mode, in the region of the display screen where the gray scale difference is large, the brightness of the sub-regions in the two rows of pixels is significantly lower than that of the main region, forming two dark bands. In the normal driving mode, there is also a problem of a dark band in the sub-region in the pixel. Referring to fig. 1, fig. 1 is a schematic diagram of a jaggy phenomenon of a frame in the prior art. A partial enlarged view of a display panel including a plurality of sub-pixels each including a main region and a sub-region is shown in fig. 1. The diagonally filled region indicates a lower luminance, and the non-diagonally filled region indicates a higher luminance. In the same sub-pixel, the brightness of the sub-region is lower than that of the main region, a plurality of sub-pixels form a plurality of dark bands, and the macroscopic appearance of the dark bands is a picture saw-tooth feel, so that the display effect of the display panel is affected. How to improve the jaggy feeling of the 8-domain liquid crystal display panel is one of the technical problems that the skilled in the art needs to solve. The present application proposes the following scheme based on the above technical problems.
Referring to fig. 2, the present application provides a brightness adjustment method of a display panel, which includes:
s10, acquiring a first gray scale value of a target sub-pixel to be displayed;
s20, obtaining a second gray scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance;
s30, acquiring an association relation between a gray scale difference value and a compensation voltage, and determining the compensation voltage of the target sub-pixel based on a first difference value of the first gray scale value and the second gray scale value;
and S40, compensating the brightness of the target sub-pixel according to the compensation voltage.
According to the method and the device, the first gray scale value of the target sub-pixel and the second gray scale value of the reference sub-pixel are compared, so that the first difference value of the first gray scale value and the second gray scale value is obtained, the brightness of the target sub-pixel is compensated according to the association relation between the gray scale difference value and the compensation voltage, the brightness of the secondary area of the target sub-pixel is increased, the problem of dark bands caused by insufficient brightness of the target sub-pixel is solved, and the problem of the jaggy feeling of a picture is further solved.
It should be noted that, the mainstream method for implementing the 8-domain sub-pixel includes 3T technology, and 3T means that the sub-pixel includes a first transistor T1, a second transistor T2, and a third transistor T3. Referring to fig. 3, the first transistor T1 is located in the main region and is used for charging the first capacitor C1 and the second capacitor C2 in the main region; the second transistor T2 and the third transistor T3 are located in the sub-region, and the second transistor T2 is configured to charge the third capacitor C3 and the fourth capacitor C4 in the sub-region. The third transistor T3 is connected to the shared voltage terminal sharebar for leakage of the sub-region. Therefore, although the data signal terminal provides the same data signal for the main area and the auxiliary area of the sub-pixel, the main area has no electric leakage, and the auxiliary area has electric leakage, so that the actual voltages at the two ends of the liquid crystal of the main area and the auxiliary area are different, different deflection angles are realized, and finally, the main area and the auxiliary area display different brightness.
In some embodiments, when the difference between voltages applied to both ends of the liquid crystal is large, the deflection angle of the liquid crystal molecules is large, the transmittance of the display panel is large, and the brightness of the display is bright; when the difference of voltages applied to both ends of the liquid crystal is small, the deflection angle of the liquid crystal molecules is small, the transmittance of the display panel is small, and the brightness of the display is dark. It is to be noted that the deflection angle of the liquid crystal is affected by the absolute value of the difference in voltages applied across the liquid crystal.
For any one of the sub-pixels, the absolute value of the first voltage difference of the liquid crystal of the main region is higher than the absolute value of the second voltage difference of the sub-region due to the shared voltage terminal sharebar leakage, and thus the luminance of the main region is greater than that of the sub-region. The brightness of the auxiliary area is mainly determined by the voltage of the shared voltage terminal sharebar, when the voltage of the shared voltage terminal sharebar is high, the electric leakage speed of the auxiliary area is low, the brightness difference between the auxiliary area and the main area is relatively small, and the dark band is not obvious. When the voltage of the shared voltage terminal sharebar is low, the brightness difference between the auxiliary area and the main area is relatively large, and at the moment, the color cast problem of the large visual angle of the display panel is weakened, and the visual angle is better.
For two adjacent lines of sub-pixels, when the gray scale difference of the sub-pixels is large, the brightness of the sub-region between the two lines of main regions is low, a dark band is formed, and the macroscopic appearance is that the picture generates a jaggy feeling. When the gray scale difference between two adjacent rows of sub-pixels is smaller, the brightness of the secondary region between the two rows of main regions is still lower, but the difference between the main region and the secondary region is relatively insignificant, and is not easily perceived by human eyes. Therefore, according to the first difference between the target sub-pixel and the reference sub-pixel, different compensation voltages are provided for the shared voltage terminal sharebar, so that the voltage of the shared voltage terminal sharebar can be dynamically adjusted, the brightness difference between the auxiliary area and the main area can be reduced, the problem of jaggy feeling of a picture caused by the existence of a dark band can be solved, and the good effect of large visual angle can be achieved.
In this embodiment, since the main area and the sub-area of the sub-pixel are connected to the same data signal terminal, the first gray scale values of the main area and the sub-area of the sub-pixel are the same value, and only the actual brightness displayed in the main area and the sub-area are different. Similarly, the second gray scale values of the main area and the sub-area of the reference sub-pixel are the same value.
Specifically, the preset interval can be adjusted according to actual needs. In some embodiments, the predetermined spacing refers to a row or two adjacent rows arranged in the same column. That is, the reference subpixel may be a subpixel disposed in the same column as the target subpixel and located adjacent to the target subpixel or one row apart. For example, when the display panel is in the normal driving mode, the interval preset pitch refers to the already displayed same column of sub-pixels adjacent to the target sub-pixel to be displayed. When the display panel is in a dual-line scanning mode, the preset interval refers to the sub-pixels which are already displayed in the same column and are separated from the target sub-pixel to be displayed by one line.
In this embodiment, the association between the gray-scale difference value and the compensation voltage may be obtained through testing, so that the brightness of the sub-area of the target sub-pixel may be compensated according to the association between the gray-scale difference value and the compensation voltage, and according to the first gray-scale value of the target sub-pixel, the second gray-scale value of the reference sub-pixel, the first difference value of the first gray-scale value and the second gray-scale value.
In this embodiment, the compensation for the brightness of the target subpixel according to the compensation voltage refers to setting the shared voltage terminal sharebar of the target subpixel as the compensation voltage, so as to further improve the brightness of the sub-area of the target subpixel, reduce the brightness difference between the main area and the sub-area of the target subpixel, and thereby improve the problem of the jaggy feel of the picture.
The technical solutions of the present application will now be described with reference to specific embodiments.
In the luminance adjustment method of the present application, step S10 includes:
s101, acquiring the position information of the target sub-pixel;
s102, acquiring a first gray-scale voltage of the target sub-pixel according to the position information;
s103, according to the gray scale voltage, a first gray scale value of the target sub-pixel is obtained.
In this embodiment, the location information of the target sub-pixel includes an abscissa and an ordinate. The subpixels of the display panel are distributed in an array, and comprise a plurality of rows and a plurality of columns of subpixels. Wherein the abscissa determines the row position of the sub-pixel and the ordinate determines the column position of the sub-pixel.
In this embodiment, the gray-scale voltage of the target subpixel has a corresponding relationship with the first gray-scale value, so that the first gray-scale value of the target subpixel can be determined according to the gray-scale voltage of the target subpixel.
In the luminance adjustment method of the present application, step S20 includes:
s201, acquiring a driving mode of the display panel;
s202, determining the position information of the reference sub-pixel according to the driving mode of the display panel;
s203, according to the position information, obtaining a second gray scale value of the reference sub-pixel.
In the present embodiment, the driving modes of the display panel include a normal driving mode and a double-line scanning mode.
The conventional driving mode refers to that the display panel scans one row at a time, that is, at the same time, only the gates of one row of pixels are turned on and data signals are written, and then the row of pixels are turned off, and the next row is continuously scanned.
The dual-line scanning mode refers to that the display panel scans two lines each time, that is, at the same time, the gates of two adjacent lines of pixels are simultaneously turned on and written with data signals, then the two lines of pixels are turned off, and the next two lines of pixels are continuously scanned.
When the driving modes of the display panels are different, the position information of the reference sub-pixels is also different. In some embodiments, the reference sub-pixel may be a sub-pixel in the same column as the target sub-pixel and located in one or two adjacent rows, or may be a sub-pixel in the same column as the target sub-pixel and in one or two adjacent columns, and may specifically be adjusted according to the actual display shape of the dark band of the display panel.
In the brightness adjustment method of the present application, step S202 includes:
when the driving mode of the display panel is a normal driving mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 1, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel;
when the driving mode of the display panel is a double-line scanning mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 2, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel.
In the present embodiment, when the driving mode of the display panel is the normal driving mode, assuming that the coordinates of the target subpixel are (X, Y), the coordinates of the reference subpixel may be (X-1, Y). It should be noted here that the coordinates of the reference sub-pixel are (X-1, y), where X-1 refers to the abscissa of one already displayed sub-pixel before the target sub-pixel to be displayed, and not to the actual number of coordinates of the sub-pixel. That is, when the scanning direction of the display panel is opposite, for example, the scanning direction is reverse scanning from the last line of the display panel, the coordinates of the reference subpixel still refer to one already displayed subpixel arranged in the same column as the target subpixel in the line preceding the target subpixel to be displayed.
In the present embodiment, when the driving mode of the display panel is the double-line scanning mode, the coordinates of the reference sub-pixel may be (X-2, Y) assuming that the coordinates of the target sub-pixel are (X, Y). It should be noted here that the coordinates of the reference sub-pixel are (X-2, y), where X-2 refers to the abscissa of one already displayed sub-pixel before the target sub-pixel to be displayed, and not to the actual number of coordinates of the sub-pixel. That is, when the scanning direction of the display panel is opposite, for example, the scanning direction is reverse scanning from the last line of the display panel, the coordinates of the reference sub-pixel still refer to one already displayed sub-pixel arranged in the same column as the target sub-pixel by one line before the target sub-pixel to be displayed.
In some embodiments, the abscissa and the ordinate of the reference sub-pixel may also be adjusted according to the display effect of the display panel. The relationship between the abscissa and the ordinate of the reference subpixel is not limited to the relationship in the above embodiment, and the coordinate relationship between the reference subpixel and the target subpixel is not limited in this application.
In the luminance adjustment method of the present application, step S203 includes:
S2301, obtaining a second gray scale voltage of the reference sub-pixel according to the position information;
s2302, obtaining a second gray scale value of the reference sub-pixel according to the second gray scale voltage.
In this embodiment, the second gray scale voltage of the reference sub-pixel has a corresponding relationship with the second gray scale value, so the second gray scale value of the reference sub-pixel can be determined according to the second gray scale voltage of the reference sub-pixel.
In the brightness adjustment method of the present application, referring to fig. 3, the display panel includes a first transistor T1, a second transistor T2, and a third transistor T3, gates of the first transistor T1, the second transistor T2, and the third transistor T3 are connected to a scan signal terminal, drains of the first transistor T1 and the second transistor T2 are connected to a data signal terminal, a source of the second transistor T2 is connected to a drain of the third transistor T3, and a source of the third transistor T3 is connected to a shared voltage terminal sharebar;
wherein, step S30 includes:
s301, acquiring an association relation between a gray scale difference value and a compensation voltage;
s302, obtaining a first difference value between the first gray scale value and the second gray scale value;
s303, determining the compensation voltage of the shared voltage terminal sharebar in the target sub-pixel according to the association relation between the gray level difference value and the compensation voltage and the first difference value.
In this embodiment, the scan signal Gate is used for controlling the first transistor T1, the second transistor T2, and the third transistor T3 to be turned on and off, and the Data signal Data is used for providing the Data signal. After the scan signal provided by the scan signal terminal Gate turns on the first transistor T1, the second transistor T2, and the third transistor T3, the data signal charges the first capacitor C1 and the second capacitor C2 through the first transistor T1, and charges the third capacitor C3 and the fourth capacitor C4 through the second transistor T2, thereby sharing the shared voltage terminal sharebar leakage.
The Array Com and the CF Com are used for providing a common voltage, and the sharebar is used for providing a compensation voltage of the sharebar at the shared voltage end. For the main region, the first capacitor C1 is a storage capacitor, the second capacitor C2 is a liquid crystal capacitor, and the liquid crystal molecules in the main region deflect under the action of the common voltage of CF Com and the voltage difference between the other end (i.e., the end connected to the source of the first transistor T1) of the second capacitor C2.
For the sub-region, the third capacitor C3 is a storage capacitor, the fourth capacitor C4 is a liquid crystal capacitor, and the liquid crystal molecules of the sub-region deflect under the effect of the common voltage of CF Com and the voltage difference between the other end of the fourth capacitor C4 (i.e., the end connected to the source of the second transistor T2).
Because the shared voltage terminal sharebar has electric leakage, the deflection angles of the liquid crystal molecules of the main area and the liquid crystal molecules of the auxiliary area are different, so that different brightness is realized.
In the luminance adjustment method of the present application, step S301 includes:
s3011, obtaining a plurality of test panels;
s3012, testing a plurality of test panels for a plurality of times to obtain gray scale differences and brightness differences of a plurality of sub-pixels of the test panels;
s3013, adjusting the compensation voltage according to the brightness difference value, and recording the compensation voltage when the brightness difference value meets the preset requirement;
s3014, obtaining the association relation between the gray scale difference value and the compensation voltage according to the tested gray scale difference value and the recorded compensation voltage.
In this embodiment, the gray-scale difference values and the brightness difference values of the plurality of sub-pixels of the test panel are obtained through testing, and the association relationship between the gray-scale difference values of the sub-pixels and the compensation voltage is obtained according to the mapping relationship between the brightness difference values and the compensation voltage.
In this embodiment, the compensation voltage of the shared voltage terminal sharebar of the sub-pixels is adjusted to obtain the brightness difference value of the main area and the sub-area of the sub-pixels under each compensation voltage, and when the brightness difference value meets the preset requirement, the compensation voltage corresponding to the brightness difference value is recorded.
In this embodiment, when the luminance difference between the main area and the sub-area is large, a good large viewing angle performance can be achieved; when the brightness difference between the main area and the auxiliary area is smaller, the dark band can be weakened, and the jaggy feeling of the picture can be improved. Therefore, the relation of the brightness difference value of the main area and the auxiliary area can be determined according to the actual requirement. The present application does not limit the preset requirements.
In this embodiment, referring to fig. 4, fig. 4 is a correlation chart of gray scale difference values and compensation voltages in the present application. In fig. 4, the abscissa indicates the gray scale value of the target subpixel, and the ordinate indicates the compensation voltage of the shared voltage terminal sharebar. The ordinate origin is the compensation voltage V1 of the shared voltage terminal sharebar when the technical scheme of the application is not implemented.
For liquid crystal display panels with different sizes, the compensation voltage of the shared voltage terminal sharebar can be set to be different, the specific numerical value of the shared voltage terminal sharebar is not required, the original compensation voltage of the shared voltage terminal sharebar when the technical scheme of the application is not implemented is denoted as V1, and the maximum value of the compensation voltage is denoted as Vmax. The maximum value Vmax of the compensation voltage can be obtained from the test result. In some embodiments, the maximum value Vmax of the compensation voltage may be a value when the brightness of the main area is the same as that of the auxiliary area, or may be a value when the brightness of the main area is close to that of the auxiliary area, and may be set according to the actual requirements of improving the viewing angle and improving the dark band in actual situations, which is not limited in this application. When the brightness of the main area and the brightness of the auxiliary area are the same or are close to each other, the dark band is obviously improved, the jaggy feeling of the picture is eliminated, and the display effect of the display panel is improved. The maximum value Vmax of the compensation voltage is different for different sized liquid crystal display panels, which is not limited in the present application.
In the brightness adjustment method of the present application, the sub-pixel of the display panel includes a main region and a sub-region,
wherein, step S3012 includes:
s30121, testing a plurality of test panels, obtaining a third gray scale value of a target sub-pixel of the test panel and a fourth gray scale value of a reference sub-pixel spaced apart from the target sub-pixel by a preset distance, and obtaining a third brightness value of a main area of the target sub-pixel and a fourth brightness value of a sub-area of the target sub-pixel;
s30122, acquiring a gray scale difference value of the test panel according to the third gray scale value and the fourth gray scale value, and acquiring a brightness difference value of the test panel according to the third brightness value and the fourth gray scale value.
In this embodiment, the target sub-pixel may be any sub-pixel on the display panel, and the reference sub-pixel is a sub-pixel of the target sub-pixel spaced by a preset interval, and the preset interval is defined by referring to the setting of the preset interval in other embodiments.
In the brightness adjustment method of the application, the association relationship between the gray scale difference value and the compensation voltage comprises a first association relationship S1, a second association relationship S2, a third association relationship S3 and a fourth association relationship S4,
Wherein the gray scale range of the first association relation S1 is 0 gray scale to 25 gray scale,
the gray scale range of the second association S2 is 26 gray scales to 128 gray scales,
the gray scale range of the third association S3 is 129 gray scales to 220 gray scales,
the fourth association S4 has a gray scale ranging from 221 gray scales to 255 gray scales,
step S303 includes:
s3031, obtaining a first gray scale value of the target sub-pixel;
s3032, judging the association relation between the first gray scale value of the target sub-pixel, the gray scale difference value of each section and the compensation voltage;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the first association relation S1 is not empty, setting the compensation voltage as the first compensation voltage in the first association relation S1;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the second association relation S2 is not empty, setting the compensation voltage as a second compensation voltage in the second association relation S2;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the third association relation S3 is not empty, setting the compensation voltage as a third compensation voltage in the third association relation S3;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the fourth association S4 is not empty, the compensation voltage is set to the fourth compensation voltage in the fourth association S4.
In this embodiment, referring to fig. 4, the correlation curve between the gray-scale difference value and the compensation voltage is divided into four segments according to the range of the first gray-scale value of the target sub-pixel. The gray scale range of the first association relation S1 is 0 gray scale to 25 gray scale, the gray scale range of the second association relation S2 is 26 gray scale to 128 gray scale, the gray scale range of the third association relation S3 is 129 gray scale to 220 gray scale, and the gray scale range of the fourth association relation S4 is 221 gray scale to 255 gray scale. It should be noted that, the division of the association relationship curve between the gray level difference value and the compensation voltage may be adjusted according to the actual requirement, which is not limited in the present application.
Specifically, a first gray scale value of the target sub-pixel is obtained, and a section of an association relation curve of the corresponding gray scale difference value and the compensation voltage is determined according to the first gray scale value. For example, the first gray level value is 160 gray levels, and the corresponding third association relationship S3 is the first gray level value. Referring to fig. 5, when the first gray level is 160 gray levels, a second point on the third association relation S3 corresponding to the first difference value L is determined according to the third association relation S3 and the first difference value L, and a third compensation voltage V3 is determined according to an ordinate of the point on the curve S3. When the first gray scale value corresponds to other sections of the association relation between the gray scale difference value and the compensation voltage, the corresponding compensation voltage can be determined by adopting the method.
The present application further provides a brightness adjusting device 100 of a display panel, referring to fig. 6, the brightness adjusting device 100 includes:
a first gray-scale value obtaining unit 10, configured to obtain a first gray-scale value of a target subpixel to be displayed;
a second gray-scale value obtaining unit 20, configured to obtain a second gray-scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance;
a compensation voltage determining unit 30, configured to obtain an association relationship between a gray level difference value and a compensation voltage, and determine the compensation voltage of the target subpixel based on a first difference value between the first gray level value and the second gray level value;
and a compensation unit 40 for compensating the brightness of the target sub-pixel according to the compensation voltage.
The brightness adjustment device 100 is further configured to obtain location information of the target subpixel;
the brightness adjustment device 100 is further configured to obtain a first gray-scale voltage of the target subpixel according to the position information;
the brightness adjustment device 100 is further configured to obtain a first gray-scale value of the target subpixel according to the gray-scale voltage.
The brightness adjustment device 100 is further configured to obtain a driving mode of the display panel;
the brightness adjustment device 100 is further configured to determine location information of the reference sub-pixel according to a driving mode of the display panel;
The brightness adjustment device 100 is further configured to obtain a second gray-scale value of the reference subpixel according to the position information.
The brightness adjustment device 100 is further configured to, when the driving mode of the display panel is a normal driving mode, decrease the abscissa of the reference subpixel by 1, and decrease the ordinate of the reference subpixel by 1;
when the driving mode of the display panel is a double-line scanning mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 2, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel.
The brightness adjusting device 100 is further configured to obtain a second gray-scale voltage of the reference subpixel according to the position information;
the brightness adjustment device 100 is further configured to obtain a second gray-scale value of the reference subpixel according to the second gray-scale voltage.
The display panel comprises a first transistor T1, a second transistor T2 and a third transistor T3, wherein the gates of the first transistor T1, the second transistor T2 and the third transistor T3 are connected with a scanning signal end, the drains of the first transistor T1 and the second transistor T2 are connected with a data signal end, the sources of the second transistor T2 and the drain of the third transistor T3 are connected, and the sources of the third transistor T3 are connected with a shared voltage end;
The brightness adjusting device 100 is further configured to obtain an association relationship between a gray level difference value and a compensation voltage;
the brightness adjustment device 100 is further configured to obtain a first difference value between the first gray-scale value and the second gray-scale value;
the brightness adjusting device 100 is further configured to determine the compensation voltage of the shared voltage terminal in the target subpixel according to the association between the gray level difference value and the compensation voltage and the first difference value.
The brightness adjusting device 100 is further configured to obtain a plurality of test panels;
the brightness adjusting device 100 is further configured to perform multiple tests on a plurality of test panels, and obtain gray scale differences and brightness differences of a plurality of sub-pixels of the test panels;
the brightness adjusting device 100 is further configured to adjust the compensation voltage according to the brightness difference value, and record the compensation voltage when the brightness difference value meets a preset requirement;
the brightness adjusting device 100 is further configured to obtain an association relationship between the gray-scale difference value and the compensation voltage according to the tested gray-scale difference value and the recorded compensation voltage.
The sub-pixels of the display panel include a main area and a sub-area, and the brightness adjusting device 100 is further configured to test a plurality of the test panels, obtain a third gray-scale value of a target sub-pixel of the test panel and a fourth gray-scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance, and obtain a third brightness value of the main area of the target sub-pixel and a fourth brightness value of the sub-area of the target sub-pixel;
The brightness adjusting device 100 is further configured to obtain a gray-scale difference value of the test panel according to the third gray-scale value and the fourth gray-scale value, and obtain a brightness difference value of the test panel according to the third brightness value and the fourth gray-scale value.
The association relationship between the gray scale difference value and the compensation voltage includes a first association relationship S1, a second association relationship S2, a third association relationship S3, and a fourth association relationship S4, where the gray scale range of the first association relationship S1 is 0 gray scale to 25 gray scale, the gray scale range of the second association relationship S2 is 26 gray scale to 128 gray scale, the gray scale range of the third association relationship S3 is 129 gray scale to 220 gray scale, the gray scale range of the fourth association relationship S4 is 221 gray scale to 255 gray scale, and the brightness adjustment device 100 is further configured to obtain the first gray scale value of the target subpixel;
the brightness adjusting device 100 is further configured to determine an association relationship between the first gray-scale value of the target subpixel and the gray-scale difference value and the compensation voltage of each segment;
the brightness adjustment device 100 is further configured to set the compensation voltage to a first compensation voltage in the first association S1 when an intersection of the first gray-scale value of the target subpixel and the gray-scale range of the first association S1 is not empty;
The brightness adjustment device 100 is further configured to set the compensation voltage to a second compensation voltage in the second association S2 when the intersection of the first gray-scale value of the target subpixel and the gray-scale range of the second association S2 is not empty;
the brightness adjustment device 100 is further configured to set the compensation voltage to a third compensation voltage in the third association S3 when the intersection of the first gray-scale value of the target subpixel and the gray-scale range of the third association S3 is not empty;
the brightness adjustment device 100 is further configured to set the compensation voltage to a fourth compensation voltage in the fourth association S4 when the intersection of the first gray-scale value of the target subpixel and the gray-scale range of the fourth association S4 is not empty.
The application also provides a mobile terminal, which comprises the brightness adjusting device 100.
In this embodiment, the mobile terminal may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing describes in detail a method and apparatus for adjusting brightness of a display panel provided in the embodiments of the present application, and specific examples are applied to describe the principles and embodiments of the present application, where the descriptions of the foregoing examples are only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. The brightness adjusting method of the display panel is characterized in that the display panel comprises a first transistor, a second transistor and a third transistor, wherein the gates of the first transistor, the second transistor and the third transistor are connected with a scanning signal end, the drains of the first transistor and the second transistor are connected with a data signal end, the sources of the second transistor and the drain of the third transistor are connected, and the sources of the third transistor are connected with a shared voltage end; the sub-pixel of the display panel includes a main region and a sub-region, and the brightness adjustment method includes:
Acquiring a first gray scale value of a target sub-pixel to be displayed;
acquiring a second gray scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance;
acquiring an association relation between a gray scale difference value and a compensation voltage, and determining the compensation voltage of the target sub-pixel based on a first difference value of the first gray scale value and the second gray scale value;
compensating the brightness of the target sub-pixel according to the compensation voltage;
wherein, the step of obtaining the association relationship between the gray level difference value and the compensation voltage, and determining the compensation voltage of the target sub-pixel based on the first difference value between the first gray level value and the second gray level value includes:
acquiring the association relation between the gray scale difference value and the compensation voltage;
acquiring a first difference value of the first gray scale value and the second gray scale value;
determining the compensation voltage of the shared voltage end in the target sub-pixel according to the association relation between the gray scale difference value and the compensation voltage and the first difference value;
the step of obtaining the association relation between the gray level difference value and the compensation voltage comprises the following steps:
acquiring a plurality of test panels;
performing multiple tests on the plurality of test panels to obtain gray scale differences and brightness differences of a plurality of sub-pixels of the test panels;
According to the brightness difference value, adjusting the compensation voltage, and recording the compensation voltage when the brightness difference value meets the preset requirement;
obtaining the association relation between the gray scale difference value and the compensation voltage according to the tested gray scale difference value and the recorded compensation voltage;
the step of performing multiple tests on the plurality of test panels to obtain gray scale differences and brightness differences of the plurality of sub-pixels of the test panels includes:
testing a plurality of test panels, obtaining a third gray level value of a target sub-pixel of the test panel and a fourth gray level value of a reference sub-pixel spaced apart from the target sub-pixel by a preset interval, and obtaining a third brightness value of a main area of the target sub-pixel and a fourth brightness value of a sub-area of the target sub-pixel;
and acquiring a gray scale difference value of the test panel according to the third gray scale value and the fourth gray scale value, and acquiring a brightness difference value of the test panel according to the third brightness value and the fourth brightness value.
2. The method according to claim 1, wherein the step of obtaining the first gray-scale value of the target subpixel to be displayed comprises:
Acquiring the position information of the target sub-pixel;
acquiring a first gray-scale voltage of the target sub-pixel according to the position information;
and acquiring a first gray scale value of the target sub-pixel according to the gray scale voltage.
3. The method of claim 1, wherein the step of obtaining the second gray-scale value of the reference sub-pixel spaced apart from the target sub-pixel by a predetermined distance comprises:
acquiring a driving mode of the display panel;
determining position information of the reference sub-pixels according to a driving mode of the display panel;
and acquiring a second gray scale value of the reference sub-pixel according to the position information.
4. A brightness adjustment method according to claim 3 wherein the step of determining the position information of the reference sub-pixel according to the driving mode of the display panel comprises:
when the driving mode of the display panel is a normal driving mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 1, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel;
when the driving mode of the display panel is a double-line scanning mode, the abscissa of the reference sub-pixel is the abscissa of the target sub-pixel minus 2, and the ordinate of the reference sub-pixel is the ordinate of the target sub-pixel.
5. A brightness adjustment method according to claim 3 wherein the step of obtaining the second gray-scale value of the reference sub-pixel based on the position information comprises:
acquiring a second gray scale voltage of the reference sub-pixel according to the position information;
and obtaining a second gray scale value of the reference sub-pixel according to the second gray scale voltage.
6. The method of claim 1, wherein the association between the gray-scale difference and the compensation voltage includes a first association, a second association, a third association, and a fourth association,
wherein the gray scale range of the first association relation is 0 gray scale to 25 gray scale,
the gray scale range of the second association is 26 gray scales to 128 gray scales,
the gray scale range of the third association is 129 gray scales to 220 gray scales,
the fourth association is in the range of 221 to 255 gray levels,
the step of determining the compensation voltage of the shared voltage terminal in the target sub-pixel according to the association relationship between the gray scale difference value and the compensation voltage and the first difference value includes:
acquiring a first gray scale value of the target sub-pixel;
judging the association relation between the first gray scale value of the target sub-pixel and the gray scale difference value and compensation voltage of each section;
When the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the first association is not empty, setting the compensation voltage as the first compensation voltage in the first association;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the second association is not empty, setting the compensation voltage as a second compensation voltage in the second association;
when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the third association is not empty, setting the compensation voltage as a third compensation voltage in the third association;
and when the intersection of the first gray scale value of the target sub-pixel and the gray scale range of the fourth association is not empty, setting the compensation voltage as a fourth compensation voltage in the fourth association.
7. A luminance adjusting device employing the luminance adjusting method of a display panel according to any one of claims 1 to 6, comprising:
a first gray-scale value obtaining unit, configured to obtain a first gray-scale value of a target subpixel to be displayed;
a second gray-scale value obtaining unit, configured to obtain a second gray-scale value of a reference sub-pixel spaced from the target sub-pixel by a preset distance;
The compensation voltage determining unit is used for obtaining the association relation between the gray level difference value and the compensation voltage and determining the compensation voltage of the target sub-pixel based on the first difference value of the first gray level value and the second gray level value;
and the compensation unit is used for compensating the brightness of the target sub-pixel according to the compensation voltage.
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| CN106847157A (en) * | 2017-03-24 | 2017-06-13 | 上海天马有机发光显示技术有限公司 | The luminance compensation method and device of a kind of display panel |
| CN112799255A (en) * | 2020-10-30 | 2021-05-14 | Tcl华星光电技术有限公司 | Display panel and display device |
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| CN106205536A (en) * | 2016-08-30 | 2016-12-07 | 深圳市华星光电技术有限公司 | The driving method of liquid crystal panel and device |
| CN106847157A (en) * | 2017-03-24 | 2017-06-13 | 上海天马有机发光显示技术有限公司 | The luminance compensation method and device of a kind of display panel |
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