CN111968583A - Display panel brightness compensation control method and brightness compensation control system - Google Patents
Display panel brightness compensation control method and brightness compensation control system Download PDFInfo
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
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- 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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- 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 relates to the technical field of display, in particular to a display panel brightness compensation control method and a display panel brightness compensation control system, wherein the method comprises the steps of obtaining brightness data of a display panel, wherein the brightness data of the display panel is obtained by sensing the light emission of pixels of the display panel driven by a same gray-scale pure color signal; dividing brightness data of a display panel into a plurality of regional brightness data sets, and dividing the brightness data of the display panel according to a plurality of light emitting regions of the display panel, wherein the regional brightness data sets comprise a brightness data set positioned in a central region of the display panel and a brightness data set positioned in a non-central region; calculating a brightness compensation coefficient of a pixel in a non-central area by taking the brightness data set of the central area as reference data; the compensation voltage of the pixels positioned in the non-central area is adjusted through the brightness compensation coefficient, so that the display panel can uniformly emit light. The method can save data storage space, improve operation rate and improve the uniformity of the brightness of the display panel.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a brightness compensation control method and a brightness compensation control system for a display panel.
Background
An Organic Light Emitting Diode (OLED) Display panel has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, wide temperature range, flexible Display, large-area full color Display, and the like, and is considered as a Display panel with the most potential development in the industry.
For an OLED display panel, each pixel includes an OLED device and a driving circuit for driving the OLED device to emit light. Because the voltage drop occurs when the power voltage is affected by the impedance of the power wiring in the transmission process, the current flowing through each driving circuit is different, and the brightness of the OLED devices in each area is inconsistent. When the display panel displays a pure color image, the brightness of each area of the display panel is inconsistent, and the display image is not uniform.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a display panel brightness compensation control method and a brightness compensation control system, which can improve the uniformity of display brightness of a display panel and save data storage space.
In order to solve the technical problem, the application adopts a technical scheme that: the display panel brightness compensation control method comprises the following steps:
acquiring brightness data of a display panel, wherein the brightness data of the display panel is obtained by sensing the light emission of pixels of the display panel driven by a same gray-scale pure color signal;
dividing brightness data of a display panel into a plurality of regional brightness data sets, and dividing the brightness data of the display panel according to a plurality of light emitting regions of the display panel, wherein the regional brightness data sets comprise a brightness data set positioned in a central region of the display panel and a brightness data set positioned in a non-central region;
calculating a brightness compensation coefficient of a pixel in a non-central area by taking the brightness data set of the central area as reference data;
the compensation voltage of the pixels positioned in the non-central area is adjusted through the brightness compensation coefficient, so that the display panel can uniformly emit light.
Wherein, taking the brightness data set of the central area as reference data, calculating the brightness compensation coefficient of the brightness data set of the non-central area comprises:
the average value of the luminance data set of the central region is used as reference data, and the luminance compensation coefficient of the pixel of the non-central region is calculated.
Wherein, the brightness compensation coefficient satisfies the following formula:
Wherein, adjust the compensation voltage of the pixel that is located in non-central zone through the luminance compensation coefficient, make the display panel luminous even, include:
judging whether the brightness compensation coefficient of the pixel of the non-central area is a positive value or a negative value;
if the brightness compensation coefficient is a positive value, determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient, and reducing the data voltage to reduce the driving current of the pixels in the non-central area, so that the brightness of the non-central area is approximately consistent with that of the central area;
if the brightness compensation coefficient is a negative value, determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient, and increasing the data voltage to increase the driving current of the pixels in the non-central area, so that the brightness of the non-central area is consistent with that of the central area.
Wherein, adjust the compensation voltage of the pixel that is located in non-central zone through the luminance compensation coefficient, make the display panel luminous even, include:
acquiring initial voltages of pixels in each area of a display panel;
and determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient and the initial voltage of the pixels in the central area, so that the display panel emits light uniformly.
Wherein before dividing the luminance data of the display panel into a plurality of regional luminance data sets, the method comprises:
and preprocessing the brightness data of the display panel, wherein the preprocessing comprises filtering processing and smoothing processing.
The method for acquiring the brightness data of the display panel comprises the following steps:
and acquiring pure-color picture brightness data emitted by the mixed sub-pixels of the three primary colors of the display panel, or respectively acquiring the brightness data of the single-color picture displayed by the three primary colors of the display panel.
Wherein, the accuracy of the luminance compensation coefficient is positively correlated with the sensed gray-scale value of the luminance data of the display panel.
In order to solve the above technical problem, the present application further includes a second technical solution: a display panel brightness compensation control system comprises an optical acquisition device, a brightness compensation coefficient acquisition unit and a compensation voltage output unit, wherein the optical acquisition device is used for acquiring brightness data of a display panel, and the brightness data of the display panel is obtained by sensing the light emission of pixels of the display panel driven by a same gray-scale pure color signal; the brightness compensation coefficient acquisition unit is used for correspondingly dividing the brightness data into a plurality of area brightness data sets according to a plurality of light emitting areas of the display panel, and calculating the brightness compensation coefficient of a non-central area by taking the brightness data of the central area as reference data; the compensation voltage output unit is used for obtaining the compensation voltage of the pixel positioned in the non-central area according to the brightness compensation coefficient and outputting the compensation voltage.
The display panel brightness compensation control system further comprises an optical data processing device, wherein the optical data processing device is used for filtering and smoothing the collected brightness data of the display panel and outputting the brightness data to the brightness compensation coefficient acquisition unit.
The beneficial effect of this application is: in the display panel brightness compensation control method according to the embodiment of the application, the brightness compensation coefficients of the pixels in each non-central area are respectively calculated by taking the brightness data set of the central area as reference data. Wherein, when the brightness data set of the central area is taken as the reference data, the difference value between the brightness data set of the non-central area and the brightness data set of the central area is relatively small. When the brightness compensation is carried out on the display panel, the difference value is relatively small, so that the calculation amount of the brightness compensation is small, the data storage space can be saved, the calculation speed is increased, the phenomenon that the brightness of the display panel is uneven due to the pressure drop can be improved, and the consistency of the brightness of different areas of the display panel is improved.
Drawings
FIG. 1 is a schematic diagram illustrating a first embodiment of a method for controlling brightness compensation of a display panel according to the present application;
FIG. 2 is a schematic diagram of the structure of each region of the brightness data of the display panel according to the present application;
FIG. 3 is a diagram illustrating a second embodiment of a method for controlling brightness compensation of a display panel according to the present application;
FIG. 4 is a diagram illustrating a third embodiment of a method for controlling brightness compensation of a display panel according to the present application;
FIG. 5 is a diagram illustrating a fourth embodiment of a method for controlling brightness compensation of a display panel according to the present application;
FIG. 6 is a block diagram of an embodiment of a display panel brightness compensation control system according to the present application;
FIG. 7 is a block diagram of another embodiment of a display panel brightness compensation control system according to 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 is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, an embodiment of the present application provides a method for controlling brightness compensation of a display panel, including:
step 100: and acquiring brightness data of the display panel, wherein the brightness data of the display panel is obtained by sensing the light emission of pixels of the display panel driven by the same gray-scale pure color signal.
Specifically, in the embodiment of the present application, the display panel displays a pure color image, and the pixels displayed by the display panel are driven to emit light by the same gray-scale pure color signal. In the embodiment of the present application, the same gray-scale pure color signal adopted by the display panel is a white signal under 255 gray-scale, the luminance data of the display panel is 255 gray-scale luminance data, and the obtained 255 gray-scale luminance data is the data with the highest luminance. In other embodiments, the luminance data of the display panel may be obtained by sensing other gray-scale pure color signals to drive the pixels displayed by the display panel to emit light, for example, the 32 gray-scale pure color signals to drive the pixels displayed by the display panel to emit light, so as to obtain 32 gray-scale luminance data. The luminance data of the display panel acquired in the embodiment of the present application is acquired by a CCD (charge coupled device) camera, and may be acquired by an optical device such as a coms (digital) camera in other embodiments.
Step 200: the brightness data of the display panel is correspondingly divided into a plurality of regional brightness data sets according to a plurality of light emitting regions of the display panel, wherein the regional brightness data sets comprise a brightness data set positioned in a central region of the display panel and a brightness data set positioned in a non-central region of the display panel.
Specifically, as shown in fig. 2, in the present embodiment, the display panel is uniformly divided into M × N regions, wherein the display panel is divided into M rows in the longitudinal direction and N columns in the lateral direction, M and N are integers in the present embodiment, M > 1, N > 1, and M is divisible by the number V of pixels in the longitudinal direction and N is divisible by the number H of pixels in the lateral direction. Specifically, in the embodiment of the present application, luminance data of the display panel are luminance data matrices of M × N regions according to the resolution of the display panel, and luminance data corresponding to each luminance data matrix constitutes a region luminance data set. In the embodiment of the present application, the luminance data set located in the central area of the display panel is denoted by L (x, y), and the luminance data set located in the non-central area is denoted by L (M, N), for example, the luminance data sets located in the areas of the display panel are L (1, 1), L (1, N), L (M, 1), L (M, N), and the like.
Step 300: the brightness compensation coefficients of the pixels of the non-central area are calculated by using the brightness data set of the central area as reference data.
In the embodiment of the present application, the luminance data set L (x, y) of the central area is used as reference data, and the luminance compensation coefficients of the pixels of the non-central area can be calculated by combining the luminance data sets of the non-central area. When the display panel displays, voltage drop occurs when the power voltage is affected by the impedance of the power lines in the transmission process, so that the current flowing through each pixel is different, and the brightness of the pixels in different areas is inconsistent, and the area closer to the gate driving circuit 10 (see fig. 2) is affected by the voltage drop less, and the brightness is higher; the area farther from the gate driver circuit 10 is affected by the voltage drop more, and the luminance is smaller. In the embodiment of the present application, the luminance data set of the central region is used as the reference data, so that the absolute values of the difference between the luminance data set of the region close to the gate driving circuit 10 and the luminance data set of the central region and the difference between the luminance data set of the region far away from the gate driving circuit 10 and the luminance data set of the central region are relatively uniform, and the difference is relatively small; the absolute value of the difference of the luminance data sets of the partial regions with reference to the data luminance set of the region far from the gate driving circuit 10 or the data luminance set of the region near the gate driving circuit 10 is prevented from being large.
Step 400: the compensation voltage of the pixels positioned in the non-central area is adjusted through the brightness compensation coefficient, so that the display panel can uniformly emit light.
Specifically, in the embodiment of the present application, according to the magnitude of the luminance compensation coefficient, the compensation voltage of the pixel in the non-central area may be calculated, and the data voltage of the display panel is adjusted by adjusting the data signal of the display panel, so as to adjust the compensation voltage of the pixel in the non-central area of the display panel, so that the luminance of the non-central area of the display panel is consistent with the luminance area of the central area of the display panel, and the display panel emits light uniformly.
The foregoing is the core content of the present application, and the brightness compensation control method of the display panel in the present application respectively calculates the brightness compensation coefficients of the pixels in each non-central area by using the brightness data set of the central area as the reference data, where when the brightness data set of the central area is used as the reference data, the difference between the brightness data set of the non-central area and the brightness data set of the central area is relatively small, and when performing brightness compensation on the display panel, because the difference is relatively small, the computation amount of the brightness compensation is small, the data storage space can be saved, the computation rate can be increased, and the occurrence of the phenomenon of uneven brightness of the display panel due to voltage drop can be improved, and the uniformity of the brightness of different areas of the display panel can be improved.
In the embodiment of the present application, the luminance data of the display panel in step 100 is obtained by sensing the same gray-scale pure color signal to drive the pixels of the display panel to emit light. The accuracy of the luminance compensation coefficient calculated in step 300 is positively correlated to the sensed gray-scale value of the luminance data of the display panel. When the gray scale value is larger, the larger the brightness difference is, the easier it is to perform voltage compensation on the pixels of the display panel, the higher the accuracy of the measured brightness compensation coefficient is, the gray scale value of the embodiment of the present application is preferably 255 gray scales, and in other embodiments, the brightness data corresponding to other gray scale values may also be selectively obtained.
As shown in fig. 3, in the embodiment of the present application, the calculating the luminance compensation coefficient of the luminance data set of the non-central area by using the luminance data set of the central area as the reference data in step 300 includes:
step 310: the average value of the luminance data set of the central region is used as reference data, and the luminance compensation coefficient of the pixel of the non-central region is calculated.
In the embodiment of the application, the display panel is uniformly divided into M × N regions, each region may include a plurality of pixels, luminance data of each pixel in the region may be obtained to form a region luminance data set, and by using an average value of the luminance data set of the central region as reference data, accuracy of the luminance data set of the central region may be improved, accuracy of the reference data may be improved, and difficulty in calculating luminance compensation coefficients of pixels in a non-central region, which is caused by using the luminance data set as the reference data, may be reduced.
Specifically, in the embodiment of the present application, the luminance compensation coefficient satisfies the following formula:
wherein alpha isMNThe brightness compensation coefficient is the brightness compensation coefficient of the Nth column area of the Mth row in the display panel; sigma is the positive and negative of the brightness compensation coefficient,
LXYmean value of the brightness data set of the central region, LMNIs the average value of the brightness data set of the M row and N column area, and Gamma is the Gamma coefficient.
In the embodiment of the present application, the absolute value of the luminance compensation coefficient is proportional to the ratio of the average value of the luminance data set of the central region to the average value of the luminance data set of the non-central region. In the embodiment of the present application, the Gamma coefficient is a fixed value, and is determined according to the product characteristics or requirements of the display panel, specifically, in the embodiment of the present application, the Gamma coefficient is 2.2, and in other embodiments, the Gamma coefficient may also be 2.5, and the like.
In the embodiment of the present application, the luminance compensation coefficient is calculated as follows:
LMN＝L×(GrayMN/255)γformula (2);
LXY＝L×(GrayXY/255)γformula (3);
from equations (2) and (3), it can be obtained:
then the process of the first step is carried out,
wherein L represents 255 Gray scale corresponding brightness, GrayMNRepresents LMNCorresponding Gray scale value, GrayXYRepresents LXYCorresponding gray scale value, αMNThe brightness compensation coefficient is the brightness compensation coefficient of the Nth column area of the Mth row in the display panel; sigma is the positive and negative of the brightness compensation coefficient; l isXYMean value of the brightness data set of the central region, LMNIs the average value of the brightness data set of the M row and N column area, and Gamma is the Gamma coefficient. Specifically, in the embodiment of the present application, the gray scale is 255 as an example to obtain the calculation formula of the luminance compensation coefficient, and in other embodiments, the gray scale is other values, and the calculation formula of the luminance compensation coefficient of the embodiment of the present application can also be obtained.
Specifically, as shown in fig. 3, in this embodiment of the application, the adjusting the compensation voltage of the pixel located in the non-central area by the brightness compensation factor in step 400 to make the display panel emit light uniformly includes:
step 410: and judging whether the brightness compensation coefficient of the pixel of the non-central area is a positive value or a negative value.
In the embodiment of the present application, the luminance compensation coefficient of the pixel near the partial non-central area of the gate driving circuit 10 (see fig. 2) is a positive value, and the luminance compensation coefficient of the pixel far from the partial non-central area of the gate driving circuit 10 is a negative value, and the determination of the positive and negative values of the compensation voltage can be used to assist in determining the positive and negative values of the compensation voltage by determining whether the value of the luminance compensation coefficient is a positive value or a negative value.
If the brightness compensation coefficient is positive, step 420: and determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient, and reducing the data voltage to reduce the driving current of the pixels in the non-central area so that the brightness of the non-central area is the same as that of the central area.
When the brightness compensation coefficient is a positive value, the corresponding pixels in the non-central area are areas close to the gate driving circuit 10, the brightness of the pixels is stronger than that of the pixels in the central area, the compensation voltage is a negative value, and the brightness of part of the non-central area can be reduced by reducing the data voltage, so that the brightness of the non-central area and the brightness of the central area tend to be consistent, and the brightness of the non-central area and the brightness of the central area tend to be consistent.
If the luminance compensation coefficient is negative, step 430: and determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient, and increasing the data voltage to increase the driving current of the pixels in the non-central area so as to achieve the purpose of improving the brightness of the non-central area and enable the brightness of the non-central area to be consistent with the brightness of the central area.
When the luminance compensation coefficient is a negative value, the corresponding pixels in the non-central area are areas far away from the gate driving circuit 10, the luminance of the pixels is weaker than that of the pixels in the central area, the compensation voltage is a negative value, and the luminance of part of the non-central area can be increased by increasing the data voltage, so that the purpose that the luminance of the non-central area and the luminance of the central area tend to be consistent is achieved, and the luminance of the non-central area is the same as that of the central area.
As shown in fig. 4, the adjusting the compensation voltage of the pixels located in the non-central area by the brightness compensation factor in step 400 to make the display panel emit light uniformly includes:
step 401: initial voltages of pixels of a central region of a display panel are acquired.
Step 402: and determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient and the initial voltage of the pixels in the central area, so that the display panel emits light uniformly.
In the embodiment of the present application, the luminance compensation coefficient αMNWhen the initial voltage of the pixels in the central region is V and the compensation voltage of the pixels in the non-central region is DeltaV, the calculation formula of the compensation voltage is V
By a brightness compensation factor alphaMNAnd the initial voltage of the pixels in the central area is V, the compensation voltage can be calculated according to a compensation voltage calculation formula, and the data voltage of the display panel is adjusted according to the compensation voltage, so that the driving current of the pixels in the non-central area and the driving current of the pixels in the central area tend to be consistent, the brightness of the non-central area and the brightness of the central area of the display panel tend to be consistent, and the light emission of the display panel is uniform.
As shown in fig. 5, before dividing the luminance data of the display panel into a plurality of regional luminance data sets in step 200, the method includes:
step 110: and preprocessing the brightness data of the display panel, wherein the preprocessing comprises filtering processing and smoothing processing.
In the embodiment of the application, the image brightness data of the pixels of the display panel is driven by the same gray-scale pure-color signal acquired by the light acquisition equipment such as the CCD camera, the image brightness data is subjected to filtering processing and smoothing processing, the influence of the environment equipment such as the CCD camera on the brightness of the pixels can be reduced, and the image brightness data can be denoised through the filtering processing and the smoothing processing, so that the image brightness data and the actual brightness data of the pixels of the display panel tend to be consistent.
Wherein, the pixels of the display panel include sub-pixels emitting three primary colors, and the acquiring luminance data of the display panel in step 100 includes:
the method includes the steps that pure-color picture brightness data emitted by sub-pixels of three primary colors of a display panel in a mixed mode are obtained, in the embodiment of the application, pixels of the display panel comprise pure-color pictures emitted by sub-pixels of the three primary colors of red, green and blue respectively in the mixed mode, and in the embodiment of the application, the brightness data of white pictures emitted by the display panel are obtained. The brightness adjustment of the light emitted by the sub-pixels of the three primary colors can be realized by acquiring the brightness data of the white picture of the display panel, so that the display pictures of the display panel displaying various colors tend to be consistent. In other embodiments, the three primary colors may also be sub-pixels emitting other colors, and a pure color picture may be generated by mixing the sub-pixels emitting the three primary colors, and the pure color picture may be a pure color picture such as white, orange, yellow, and the like, and the embodiment of the present application does not limit the specific color of the pure color picture. In another embodiment, the luminance data of the monochrome picture displayed by the three primary colors of the display panel may also be obtained respectively, for example, the pixel of the display panel includes sub-pixels respectively emitting red, green, and blue, in this embodiment of the present application, the luminance data of the red picture emitted by the display panel may be obtained, and step 200-step 400 are performed to obtain the red picture compensation voltage; acquiring green picture brightness data sent by a display panel, and executing the steps 200-400 to obtain green picture compensation voltage; acquiring blue picture brightness data emitted by a display panel, and executing the steps 200-400 to obtain blue picture compensation voltage; and determining the final compensation voltage according to the red picture compensation voltage, the green picture compensation voltage and the blue picture compensation voltage, and adjusting the display panel according to the final compensation voltage to enable the display panel to emit light uniformly. The final compensation voltage may be an average value of the red, green, and blue picture compensation voltages, or a value in which the red, green, and blue picture compensation voltages meet other operational relationships.
Specifically, as an embodiment of the present application, a method for controlling brightness compensation of a display panel includes:
step 100': and acquiring brightness data of the display panel, wherein the brightness data of the display panel is obtained by sensing the light emission of pixels of the display panel driven by the same gray-scale pure color signal. More specifically, in the embodiment of the present application, the luminance data of the display panel is obtained by driving the pixels of the display panel to emit light by the white signal under the condition that the sensed pure color signal of the same gray scale is 255 gray scales.
Step 200': the brightness data of the display panel is correspondingly divided into a plurality of regional brightness data sets according to a plurality of light emitting regions of the display panel, wherein the regional brightness data sets comprise a brightness data set positioned in a central region of the display panel and a brightness data set positioned in a non-central region of the display panel.
The luminance data set of the central region and the luminance data set of the non-central region are averaged to obtain an average value of the luminance data sets of the respective regions.
Table 1: average and homogeneity values of the luminance data sets of the respective regions.
In particular, in the embodiment of the application, the display surface isThe panel is uniformly divided into M × N regions as shown in fig. 2, where M is 5 and N is 3, the average values of the luminance data sets of the respective regions are arranged in sequence as shown in table 1 according to the distribution of the regions according to fig. 2, and the average value of the luminance data set of the respective regions is LMNIs represented by L11＝507nit，L12＝498nit，L13＝504nit；L21＝466nit，L31＝434nit，L41＝423nit，L51＝413nit，L53394nit, where the mean value L of the luminance data set in the central region32As can be seen from fig. 2 and table 1, the average values of the luminance data sets in the first row (M ═ 1) and the second row (M ═ 2) are all larger than the average value of the luminance data set in the central region, and the average values of the luminance data sets in the fourth row (M ═ 4) and the fifth row (M ═ 5) are all smaller than the average value of the luminance data set in the central region.
Step 310': the average value of the luminance data set of the central region is used as reference data, and the luminance compensation coefficient of the pixel of the non-central region is calculated.
In the embodiment of the application, L is32With 429nit as reference data, the luminance compensation coefficients of the pixels in the non-central region are calculated, for example, L is calculated11507nit brightness compensation coefficient
L22Luminance compensation coefficient of 464nit
L42Luminance compensation coefficient of 419nit
Step 400': the compensation voltage of the pixels positioned in the non-central area is adjusted through the brightness compensation coefficient, so that the display panel can uniformly emit light.
In the examples of the present application, L22464nit, take L as an example32429nit is reference data, and if the brightness is adjusted to 464nit and 429nit, the brightness value needs to be reduced by 35nit, twoThe system is 100011, and 6 bits are occupied; assuming that the minimum value of the mean value of the luminance data set is used as reference data, L is used53394nit is the reference data, then L22When the brightness is adjusted to be 394nit from 464nit, the brightness value needs to be reduced by 70nit, the binary value is 1000110, and 7 bits are occupied, in this embodiment, L is used22When the brightness is adjusted, the occupied space of 6 bits is smaller than that of 7 bits when 464nit is used, so that the storage space occupied by taking the average value of the brightness data set of the central area as the reference data when the brightness is adjusted is smaller in the embodiment of the present application.
Example of the present application, L42419nit for example, with L32If the brightness is adjusted to 419nit to 429nit, the brightness value needs to be increased by 10nit, and the binary value is 1010, which occupies 4 bits; assuming that the minimum value of the mean value of the luminance data set is used as reference data, L is used53394nit is the reference data, then L42Adjusting 419nit to 394nit requires a 25nit reduction in brightness value, 11001 in binary, and takes 5 bits. Example of the present application, L42419nit, when adjusting the brightness, the occupied space of 4bit is smaller than that of 5bit, so the storage space occupied by the average value of the brightness data set of the central area as the reference data during adjusting the brightness is smaller in the embodiment of the present application.
In the embodiment of the present application, in the display panel, the arrangement of the brightness data set in the central area is used as a boundary, the brightness compensation coefficient near one end of the gate driving circuit 10 is a positive value, the compensation voltage is a negative value, the brightness compensation coefficient far away from one end of the gate driving circuit 10 is a negative value, the compensation voltage is a positive value, a sign bit is added at the position where the arrangement of the brightness data set in the central area is used as a boundary, and when the brightness data set in the central area and the brightness data set in the non-central area near the gate driving circuit 10 and the central area are uniformly reduced. In summary, the compensation voltage is applied to the pixels in the non-central area, so that the total storage space occupied by the pixels in the non-central area having the same brightness as the central area is smaller, and the storage space can be saved.
The luminance data of each region after the display panel is compensated by the display panel luminance compensation control method in the embodiment of the present application is shown in table 1, the uniformity of the luminance of each region reaches 96.74%, and compared with the 73.66% uniformity of the original display panel, the control method in the embodiment of the present application can make the display of the display panel more uniform.
In order to solve the above technical problem, the present application further includes a second technical solution: as shown in fig. 6, a system for controlling brightness compensation of a display panel includes an optical collecting device 610, a brightness compensation coefficient obtaining unit 620, and a compensation voltage output unit 630, where the optical collecting device 610 is used for collecting brightness data of the display panel, and the brightness data of the display panel is obtained by sensing a same gray-scale pure color signal to drive a pixel of the display panel to emit light; the brightness compensation coefficient obtaining unit 620 is configured to divide the brightness data into a plurality of area brightness data sets according to a plurality of light emitting areas of the display panel, and calculate a brightness compensation coefficient of a non-central area by using the brightness data of the central area as reference data; the compensation voltage output unit 630 is configured to obtain a compensation voltage of a pixel located in a non-central area according to the brightness compensation coefficient, and output the compensation voltage.
In the display panel brightness compensation control system of the embodiment of the present application, the optical collecting device 610 is a CCD camera, and in other embodiments, the optical collecting device 610 may also be a coms camera. When the brightness compensation coefficient obtaining unit 620 of the embodiment of the application uses the brightness data set of the central area as the reference data, the difference between the brightness data set of the non-central area and the brightness data set of the central area is relatively small, and when the brightness compensation coefficient is calculated by the brightness compensation coefficient obtaining unit 620, the difference is relatively small, so that the calculation amount of brightness compensation is small, and the data storage space can be saved. The display panel brightness compensation control system provided by the embodiment of the application can be used for improving the phenomenon that the brightness of the display panel is uneven due to pressure drop, and the consistency of the brightness of different areas of the display panel is improved.
The brightness compensation coefficient calculated by the brightness compensation coefficient obtaining unit is defined as follows:
wherein alpha isMNThe brightness compensation coefficient is the brightness compensation coefficient of the Nth column area of the Mth row in the display panel; sigma is the positive and negative of the brightness compensation coefficient,
LXYmean value of the brightness data set of the central region, LMNIs the average value of the brightness data set of the M row and N column area, and Gamma is the Gamma coefficient.
Wherein, the compensation voltage output unit 630 is configured to output the compensation voltage by obtaining an initial voltage of a pixel in a central region of the display panel; and determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient and the initial voltage of the pixels in the central area, and outputting the compensation voltage.
Specifically, the compensation voltage is defined as follows:
wherein alpha isMNThe luminance compensation coefficient is represented, and V represents the initial voltage of the pixel in the central region, and Δ V is the compensation voltage of the pixel in the non-central region.
The display panel brightness compensation control system further includes an optical data processing device 640, where the optical data processing device 640 is configured to perform filtering and smoothing processing on the collected brightness data of the display panel, and output the filtered brightness data to the brightness compensation coefficient obtaining unit 620.
In the embodiment of the present application, the optical data processing device 640 is configured to perform filtering and smoothing processing on the acquired luminance data, so as to reduce the influence of the optical acquisition device 610 on the luminance data of the pixel light emission, and the image luminance data can be denoised through the filtering and smoothing processing, so that the image luminance data and the actual luminance data of the display panel pixel tend to be consistent.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A display panel brightness compensation control method is characterized by comprising the following steps:
acquiring brightness data of a display panel, wherein the brightness data of the display panel is obtained by sensing the same gray scale pure color signal to drive pixels of the display panel to emit light;
dividing the brightness data of the display panel into a plurality of regional brightness data sets, wherein the division divides the brightness data of the display panel according to a plurality of light emitting regions of the display panel, and the regional brightness data sets comprise a brightness data set positioned in a central region and a brightness data set positioned in a non-central region of the display panel;
calculating a brightness compensation coefficient of a pixel in a non-central area by taking the brightness data set of the central area as reference data;
and adjusting the compensation voltage of the pixels positioned in the non-central area through the brightness compensation coefficient to enable the display panel to emit light uniformly.
2. The method according to claim 1, wherein the calculating the brightness compensation coefficient of the brightness data set of the non-central area using the brightness data set of the central area as the reference data comprises:
and calculating the brightness compensation coefficient of the pixel of the non-central area by taking the average value of the brightness data set of the central area as reference data.
3. The display panel brightness compensation control method of claim 2, wherein the brightness compensation coefficient satisfies the following formula:
wherein alpha isMNThe brightness compensation coefficient is the brightness compensation coefficient of the Nth column area of the Mth row in the display panel; sigma is the positive and negative of the brightness compensation coefficient,
LXYis the average value, L, of the luminance data set of the central regionMNAnd Gamma is the Gamma coefficient which is the average value of the brightness data set of the M row and N column area.
4. The method for controlling brightness compensation of a display panel according to claim 3, wherein said adjusting the compensation voltage of the pixels located in the non-central area by the brightness compensation factor to make the display panel emit light uniformly comprises:
judging whether the brightness compensation coefficient of the pixel of the non-central area is a positive value or a negative value;
if the brightness compensation coefficient is a positive value, determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient, and reducing the data voltage to reduce the driving current of the pixels in the non-central area, so that the brightness of the non-central area is consistent with that of the central area;
if the brightness compensation coefficient is a negative value, determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient, and increasing the data voltage to increase the driving current of the pixels in the non-central area, so that the brightness of the non-central area is consistent with that of the central area.
5. The method for controlling brightness compensation of a display panel according to claim 1, wherein said adjusting the compensation voltage of the pixels located in the non-central area by the brightness compensation factor to make the display panel emit light uniformly comprises:
acquiring initial voltages of pixels in a central area of a display panel;
and determining the compensation voltage of the pixels in the non-central area according to the brightness compensation coefficient and the initial voltage of the pixels in the central area, so that the display panel emits light uniformly.
6. The method for controlling brightness compensation of a display panel according to claim 1, wherein the dividing the brightness data of the display panel into a plurality of regional brightness data sets comprises:
and preprocessing the brightness data of the display panel, wherein the preprocessing comprises filtering processing and smoothing processing.
7. The method as claimed in claim 1, wherein the pixels of the display panel comprise sub-pixels emitting three primary colors, and the obtaining the luminance data of the display panel comprises:
and acquiring pure-color picture brightness data emitted by the mixed sub-pixels of the three primary colors of the display panel, or respectively acquiring the brightness data of the single-color picture displayed by the three primary colors of the display panel.
8. The method of claim 1, wherein the accuracy of the luminance compensation factor is positively correlated to the sensed gray-scale value of the luminance data of the display panel.
9. A display panel brightness compensation control system, comprising:
the optical acquisition equipment is used for acquiring the brightness data of the display panel, and the brightness data of the display panel is obtained by sensing the same gray scale pure color signal to drive the pixel of the display panel to emit light;
the brightness compensation coefficient acquisition unit is used for correspondingly dividing the brightness data into a plurality of regional brightness data sets according to a plurality of light emitting regions of the display panel, and calculating the brightness compensation coefficient of a non-central region by taking the brightness data of the central region as reference data;
and the compensation voltage output unit is used for obtaining the compensation voltage of the pixel positioned in the non-central area according to the brightness compensation coefficient and outputting the compensation voltage.
10. The display panel brightness compensation control system of claim 9, comprising:
and the optical data processing equipment is used for filtering and smoothing the collected brightness data of the display panel and outputting the brightness data to the brightness compensation coefficient acquisition unit.
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