CN106847157B - Brightness compensation method and device of display panel - Google Patents
Brightness compensation method and device of display panel Download PDFInfo
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- CN106847157B CN106847157B CN201710184814.9A CN201710184814A CN106847157B CN 106847157 B CN106847157 B CN 106847157B CN 201710184814 A CN201710184814 A CN 201710184814A CN 106847157 B CN106847157 B CN 106847157B
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- 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
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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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The invention discloses a brightness compensation method and a device of a display panel, aiming at each preset gray scale value, the method comprises the following steps: presetting gray scale input, and inputting the same preset gray scale value into each sub-pixel; acquiring brightness, namely acquiring an actual brightness value displayed by each sub-pixel; gray scale compensation, if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than a preset threshold value, determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value, the target brightness value and a preset gray scale stepping value comparison table of each sub-pixel; compensation gray scale input, which inputs corresponding compensation gray scale values to each sub-pixel; and repeating the steps of brightness acquisition, gray scale compensation and compensation gray scale input until the percentage of the actual brightness value corresponding to the compensation gray scale value of each sub-pixel deviating from the target brightness value is smaller than the preset threshold value. The compensation gray-scale value corresponding to each sub-pixel is determined by looking up a table, and the brightness compensation result is more reliable by continuously approaching the target brightness value through multiple times of compensation.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for compensating brightness of a display panel.
Background
Under the current manufacturing process conditions, a Display device, such as a Liquid Crystal Display (LCD) or an Organic Light Emitting Diode (OLED) Display device, has a spatial and temporal non-uniformity problem, and as the size of the Display device becomes larger, the problem is more and more obvious, so that solving the Display non-uniformity of the Display device becomes one of the essential key technologies in mass production.
In the prior art, there are various brightness compensation methods, such as compensation method of Thin Film Transistor (TFT) loop, external voltage and current compensation, or optical compensation, and these compensation methods have the following disadvantages:
the compensation mode of the TFT circuit usually needs to design a more complex pixel circuit to realize the compensation of the threshold deviation of the TFT tube, the complex circuit structure increases the difficulty of realization on the process, the complex pixel circuit limits the area of a light emitting region, so that the higher pixel density ((pixel per inch, PPI) of an image cannot be realized, the external voltage and current compensation mode needs to design a peripheral circuit to monitor the voltage or the current of a pixel, and needs to match the inside of a panel to pull out a signal for monitoring, so that the complexity of the circuit is increased, the narrow frame is not beneficial to realizing, the existing optical compensation scheme is based on the data acquired by an optical acquisition device to process, the data processing process is more complex, and the obtained compensation effect is poor.
Disclosure of Invention
The embodiment of the invention provides a brightness compensation method and a brightness compensation device for a display panel, which are used for solving the problems that a brightness compensation mode in the prior art is complex in circuit or poor in compensation effect.
The embodiment of the invention provides a brightness compensation method of a display panel, which comprises the following steps:
performing brightness compensation on the display panel by adopting a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
determining compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value;
and aiming at each preset gray-scale value, performing brightness compensation on the display panel according to the following method:
inputting a preset gray scale, and inputting the same preset gray scale value into each sub-pixel;
acquiring brightness, namely acquiring an actual brightness value displayed by each sub-pixel;
gray scale compensation, if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than a preset threshold value, determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value of each sub-pixel, the target brightness value and a preset gray scale stepping value comparison table;
compensation gray scale input, which inputs corresponding compensation gray scale values to each sub-pixel;
and repeating the steps of obtaining the brightness, compensating the gray scale and inputting the compensation gray scale until the percentage of the actual brightness value corresponding to the compensation gray scale value of each sub-pixel deviating from the target brightness value is smaller than the preset threshold value.
In a possible implementation manner, in the brightness compensation method provided in an embodiment of the present invention, the determining a compensation gray-scale value corresponding to each sub-pixel according to the actual brightness value of each sub-pixel, the target brightness value, and a preset gray-scale step value comparison table includes:
searching an adjustment stepping value corresponding to each sub-pixel in the gray scale stepping value comparison table according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining a compensation gray-scale value corresponding to each sub-pixel according to the adjustment stepping value corresponding to each sub-pixel and the preset gray-scale value.
In a possible implementation manner, in the brightness compensation method provided in an embodiment of the present invention, the gray scale stepping value comparison table includes: the percentage range of the actual brightness values deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
the searching, according to the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value, for the adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table includes:
determining the percentage range corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining an adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
In a possible implementation manner, in the brightness compensation method provided in an embodiment of the present invention, the percentage ranges in the gray scale step value comparison table and the corresponding relationship between the adjustment step values are as follows:
when a < 1%, b is 0; when a is more than or equal to 1% and less than 2%, b is 1; when a is more than or equal to 2% and less than 3%, b is 2; when a is more than or equal to 3% and less than 5%, b is 3; when a is more than or equal to 5% and less than 10%, b is 4; when a is more than or equal to 10%, b is 5;
wherein, a represents the percentage of the actual brightness value deviating from the target brightness value, and b represents the adjustment stepping value;
the searching, according to the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value, for the adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table specifically includes:
judging whether the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value is less than 1%;
if yes, the corresponding adjustment stepping value of the sub-pixel is 0; and if not, determining a corresponding adjustment stepping value according to the percentage range of the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value.
In a possible implementation manner, in the brightness compensation method provided in an embodiment of the present invention, the gray scale stepping value comparison table includes: a plurality of sub-lookup tables with different brightness levels; wherein the content of the first and second substances,
each of the sub-lookup tables includes: the actual brightness value deviates from the percentage range of the target brightness value, and the adjustment stepping value corresponding to each percentage range;
within the same percentage range, the adjustment stepping value is in an increasing trend along with the increase of the brightness level;
the searching, according to the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value, for the adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table includes:
determining the brightness level corresponding to the actual brightness value of each sub-pixel to determine a corresponding sub-comparison table;
according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value, searching the percentage range corresponding to each sub-pixel in the determined sub-comparison table;
and determining an adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
In a possible implementation manner, in the brightness compensation method provided in an embodiment of the present invention, the target brightness value corresponding to the preset gray scale value is an average value of actual brightness values of the sub-pixels under the preset gray scale.
In a possible implementation manner, in the luminance compensation method provided in an embodiment of the present invention, the determining, according to the obtained compensated gray scale value of each sub-pixel corresponding to each preset gray scale value, the compensated gray scale value of each sub-pixel corresponding to all the gray scale values includes:
and obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values through difference value operation according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value.
An embodiment of the present invention further provides a brightness compensation apparatus for a display panel, including:
the first compensation module is used for performing brightness compensation on the display panel by adopting a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
the second compensation module is used for determining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value;
wherein the first compensation module comprises:
the preset gray scale input module is used for inputting the same preset gray scale value into each sub-pixel;
the brightness acquisition module is used for acquiring the actual brightness value displayed by each sub-pixel;
the gray scale compensation module is used for determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value of each sub-pixel, the target brightness value and a preset gray scale stepping value comparison table if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than the preset threshold;
the compensation gray scale input module is used for inputting corresponding compensation gray scale values to the sub-pixels;
and the repeated compensation module is used for repeating the steps of brightness acquisition, gray scale compensation and compensation gray scale input until the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value is smaller than the preset threshold value.
In a possible implementation manner, in the brightness compensation apparatus provided in an embodiment of the present invention, the gray scale compensation module includes:
a step value determining unit, configured to search, according to a percentage of an actual luminance value of each sub-pixel deviating from the target luminance value, an adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table;
and the compensation gray-scale value determining unit is used for determining the compensation gray-scale value corresponding to each sub-pixel according to the adjustment stepping value corresponding to each sub-pixel and the preset gray-scale value.
In a possible implementation manner, in the brightness compensation apparatus provided in an embodiment of the present invention, the gray scale stepping value comparison table includes: the percentage range of the actual brightness values deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
the step value determining unit is specifically configured to:
determining the percentage range corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining an adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
In a possible implementation manner, in the brightness compensation apparatus provided in an embodiment of the present invention, the gray scale stepping value comparison table includes: a plurality of sub-lookup tables with different brightness levels; wherein the content of the first and second substances,
each of the sub-lookup tables includes: the actual brightness value deviates from the percentage range of the target brightness value, and the adjustment stepping value corresponding to each percentage range;
within the same percentage range, the adjustment stepping value is in an increasing trend along with the increase of the brightness level;
the gray scale compensation module further comprises:
and the sub comparison table determining unit is used for determining the brightness level corresponding to the actual brightness value of each sub pixel so as to determine the corresponding sub comparison table.
In a possible implementation manner, in the brightness compensation apparatus provided in an embodiment of the present invention, the target brightness value corresponding to the preset gray scale value is an average value of actual brightness values of the sub-pixels under the preset gray scale value.
In a possible implementation manner, in the brightness compensation apparatus provided in an embodiment of the present invention, the second compensation module is specifically configured to:
and obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values through difference value operation according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value.
The invention has the following beneficial effects:
the embodiment of the invention provides a method and a device for compensating brightness of a display panel, wherein the method comprises the following steps: performing brightness compensation on the display panel by adopting a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value; determining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value; aiming at each preset gray-scale value, performing brightness compensation on the display panel according to the following method: presetting gray scale input, and inputting the same preset gray scale value into each sub-pixel; acquiring brightness, namely acquiring an actual brightness value displayed by each sub-pixel; gray scale compensation, if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than a preset threshold value, determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value, the target brightness value and a preset gray scale stepping value comparison table of each sub-pixel; compensation gray scale input, which inputs corresponding compensation gray scale values to each sub-pixel; and repeating the steps of brightness acquisition, gray scale compensation and compensation gray scale input until the percentage of the actual brightness value corresponding to the compensation gray scale value of each sub-pixel deviating from the target brightness value is smaller than the preset threshold value. According to the method provided by the embodiment of the invention, in the process of performing brightness compensation on the display panel, the compensation gray scale corresponding to each sub-pixel is determined according to the actual brightness value, the target brightness value and the preset gray scale stepping value comparison table of each sub-pixel, the mode of determining the compensation gray scale is simple and direct, and the brightness compensation result is more reliable by combining the actual brightness value of each sub-pixel and continuously approaching the target brightness value through multiple times of compensation.
Drawings
FIG. 1 is a flowchart illustrating a method for compensating brightness of a display panel according to an embodiment of the present invention;
FIG. 2 is a second flowchart of a brightness compensation method for a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a test apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a brightness compensation apparatus of a display panel according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a gray scale compensation module according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a brightness compensation method and device of a display panel, aiming at the problems that a brightness compensation mode in the prior art is complex in circuit or poor in compensation effect.
The following describes in detail specific embodiments of a method and an apparatus for compensating luminance of a display panel according to an embodiment of the present invention with reference to the accompanying drawings. The sizes and shapes of the various elements in the drawings are not to be considered as true scale, but rather are merely intended to illustrate the invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for compensating brightness of a display panel according to an embodiment of the present invention. The embodiment of the invention provides a brightness compensation method of a display panel, which comprises the following steps:
s101, performing brightness compensation on the display panel by adopting a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
s102, determining compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
referring to fig. 2, fig. 2 is a second flowchart of a luminance compensation method for a display panel according to an embodiment of the present invention;
s201, inputting a preset gray scale, and inputting the same preset gray scale value into each sub-pixel;
s202, acquiring brightness, and acquiring an actual brightness value displayed by each sub-pixel;
s203, judging whether the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than or equal to a preset threshold value or not; if yes, go to step S204; if not, go to step S206;
s204, gray scale compensation, namely determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value, the target brightness value and a preset gray scale stepping value comparison table of each sub-pixel;
s205, compensation gray scale input, wherein corresponding compensation gray scale values are input to the sub-pixels; returning to step S202;
and S206, finishing compensation.
The brightness compensation method provided by the embodiment of the invention comprises the steps of firstly adopting a plurality of preset gray-scale values to carry out brightness compensation on the display panel, and further obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value, so that when the display panel is used, the display panel can be lightened by combining the compensation gray-scale values of the sub-pixels, the phenomenon of uneven display can be eliminated, and the display effect of the display panel can be improved. In addition, in the process of performing brightness compensation on the display panel, the compensation gray scale corresponding to each sub-pixel is determined according to the actual brightness value, the target brightness value and the preset gray scale stepping value comparison table of each sub-pixel, the mode of determining the compensation gray scale is simple and direct, and the brightness compensation result is more reliable by combining the actual brightness value of each sub-pixel and continuously approaching the target brightness value through multiple times of compensation.
In specific implementation, the preset gray-scale value in step S101 may take any value from 0 to 255, such as 32 gray-scale, 64 gray-scale, 128 gray-scale, 180 gray-scale or 255 gray-scale, and the number of the preset gray-scale values may be set according to actual needs, and the larger the number of the preset gray-scale values is, the more accurate the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values obtained in step S102 are.
Specifically, in the brightness compensation method provided in the embodiment of the present invention, the step S102 may include:
and obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values through difference value operation according to the obtained compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value.
Because all the gray-scale values (i.e. 0-255 gray scales) are more in number, the brightness compensation of the display panel is generally not performed for all the gray-scale values, and the variation rule between the preset gray-scale value and the compensation gray-scale value can be found by combining the compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value, so as to calculate the compensation gray-scale value of each sub-pixel corresponding to all the gray-scale values, preferably, the compensation gray-scale value of each sub-pixel corresponding to all the gray-scale values can be calculated by adopting a difference value operation mode.
It should be noted that the compensation gray-scale values in step S101 and step S102 are preferably compensation gray-scale values of sub-pixels that satisfy compensation requirements determined after multiple compensations, where the compensation requirements are: the percentage of the actual brightness value corresponding to the compensation gray-scale value of each sub-pixel deviating from the target brightness value is smaller than a preset threshold value. For each gray scale value (preset gray scale value or other gray scale value without brightness compensation), recording compensation gray scale values of each sub-pixel meeting compensation requirements, summarizing parameters corresponding to each gray scale value to obtain a compensation table or a compensation curve, wherein the compensation table or the compensation curve comprises: the gray scale value, the expected brightness value, the compensated gray scale value corresponding to the gray scale value, and the actual brightness value, etc. may also include other information, such as the difference between the compensated gray scale value and the gray scale value, etc., which is not limited herein. When the display panel is actually used, the compensation gray-scale value corresponding to each sub-pixel can be searched according to the compensation table or the compensation curve and the image to be displayed, so that each sub-pixel can be directly controlled to reach a proper brightness value.
Referring to fig. 2, after step S205 is executed, step S202 is returned to, that is, the steps of luminance obtaining, gray scale compensation and compensation gray scale input are repeated until the percentage of the actual luminance value corresponding to the compensation gray scale value of each sub-pixel deviating from the target luminance value is smaller than the preset threshold, step S206 is executed, and the compensation is finished.
In practical applications, when performing brightness compensation on the display panel, a test apparatus as shown in fig. 3 may be used, the test apparatus comprising: a signal generator 302 electrically connected to the display panel 301 requiring brightness compensation, a data processor 303 electrically connected to the signal generator 302, and an optical collector 304 electrically connected to the data processor 303; the electrical signal connection may be a wired connection (i.e., a connection via a wire) or a wireless connection, such as a connection via bluetooth.
Steps S101 and S102, and steps S201 to S206 in the embodiment of the present invention may be executed under the control of the data processor 303, the data processor 303 may be a device with a data processing function, such as a computer or a server, and the functions of the components in the test apparatus described above are described below with reference to steps S201 to S206:
in step S201, the data processor 303 controls the signal generator 302 to input a preset gray scale input signal to the display panel 301, so that each sub-pixel in the display panel 301 is lit up according to the same preset gray scale value; when step S202 is executed, the data processor 303 triggers the optical collector 304 to collect the actual brightness value of each sub-pixel on the display panel 301, and then sends the actual brightness value of each sub-pixel to the data processor 303; in step S203, the data processor 303 compares the actual luminance value of each sub-pixel with the target luminance value, and if the percentage of the actual luminance value of the sub-pixel deviating from the target luminance value is greater than the preset threshold, step S204 is executed; if the percentage of the actual brightness values of all the sub-pixels deviating from the target brightness value is smaller than the preset threshold, executing step S206; step S204 is to calculate the compensation gray-scale value corresponding to each sub-pixel by the data processor 303 according to the obtained actual brightness value of each sub-pixel, the target brightness value corresponding to the preset gray-scale value and the preset gray-scale step value comparison table; in executing step S205, similar to step S201, the data processor 303 controls the signal generator 302 to input a compensation gray scale input signal to the display panel 301, so that each sub-pixel in the display panel 301 is lit up with a corresponding compensation gray scale value, and then returns to step S202; step S206 is triggered when the percentage of the actual luminance value corresponding to the compensation gray-scale value of each sub-pixel deviating from the target luminance value is smaller than the preset threshold.
It should be noted that the brightness compensation method provided in the embodiment of the present invention may be applied to any display panel 301, such as an LCD display panel 301, an Active Matrix organic light-emitting diode (AMOLED) display panel 301, or a Passive Matrix organic light-emitting diode (AMOLED) display panel 301, and the signal generator 302 may be any signal generator 302 having signal generation and data writing functions, and the optical collector 304 is preferably a Charge-coupled Device (CCD) camera, and may also be another optical collector 304, which is not limited herein.
Specifically, in the brightness compensation method provided by the embodiment of the present invention, the target brightness value corresponding to the preset gray scale value is an average value of actual brightness values of the sub-pixels under the preset gray scale.
The average value of the actual brightness values of the sub-pixels under the preset gray scale is used as the target brightness value corresponding to the preset gray scale, and after multiple times of compensation, the actual brightness values of the sub-pixels are closer to the average value of the actual brightness values, so that the actual brightness values of the sub-pixels on the display panel are approximately uniform, namely, the phenomenon of uneven brightness of the display panel is eliminated. In practical applications, other parameters may be used as the target brightness value, for example, the actual brightness value of the sub-pixel at the center position of the display panel is used as the target brightness value, so that after multiple compensations, the actual brightness value of each sub-pixel approaches the actual brightness value of the sub-pixel at the center position, and the effect of making the brightness of the display panel uniform may also be achieved.
Specifically, in the brightness compensation method provided in the embodiment of the present invention, in the step S204, determining the compensation gray-scale value corresponding to each sub-pixel according to the actual brightness value, the target brightness value, and the preset gray-scale step value comparison table, includes:
searching an adjustment stepping value corresponding to each sub-pixel in a gray scale stepping value comparison table according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining the compensation gray-scale value corresponding to each sub-pixel according to the adjustment stepping value corresponding to each sub-pixel and the preset gray-scale value.
In a specific implementation, the gray scale step value comparison table may include a percentage range in which the actual brightness value deviates from the target brightness value and an adjustment step value corresponding to each percentage range, so that the corresponding adjustment step value may be found in the gray scale step value comparison table according to the percentage in which the actual brightness value deviates from the target brightness value. And then, according to the preset gray scale value, adding or subtracting the adjustment stepping value to obtain a corresponding compensation gray scale value. The adjustment stepping value is obtained by using a table look-up mode, the target brightness value can be quickly reached, and the operation is simple, direct and effective.
The following describes the determination method of the adjustment step value with reference to different gray scale step value comparison tables:
the first method is as follows: the gray scale stepping value comparison table comprises: the percentage range of the actual brightness values deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
in step S204, the step value lookup table for the adjustment step value corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value includes:
determining the percentage range corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining the adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
The gray scale stepping value comparison table includes adjustment stepping values corresponding to different percentage ranges, and in specific implementation, the percentage range corresponding to each sub-pixel can be determined according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value, that is, the percentage range to which the percentage belongs is seen, so that the corresponding adjustment stepping value can be found in the gray scale stepping value comparison table according to the percentage range.
Specifically, in the first mode, the percentage range in the gray scale step value comparison table and the corresponding relationship between the adjustment step values are as follows, referring to table 1:
when a < 1%, b is 0; when a is more than or equal to 1% and less than 2%, b is 1; when a is more than or equal to 2% and less than 3%, b is 2; when a is more than or equal to 3% and less than 5%, b is 3; when a is more than or equal to 5% and less than 10%, b is 4; when a is more than or equal to 10%, b is 5;
wherein, a represents the percentage of the actual brightness value deviating from the target brightness value, and b represents the adjustment stepping value;
according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value, searching the corresponding adjustment stepping value of each sub-pixel in the gray scale stepping value comparison table, and the method specifically comprises the following steps:
judging whether the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value is less than 1%;
if yes, the corresponding adjustment stepping value of the sub-pixel is 0; if not, determining a corresponding adjustment stepping value according to the percentage range of the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value.
TABLE 1 one of the gray level step value look-up tables
| a | <1％ | 1％～2％ | 2％～3％ | 3％～5％ | 5％～10％ | ≥10％ |
| b | 0 | 1 | 2 | 3 | 4 | 5 |
In a specific implementation, the preset threshold may be set to 1%, and if the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value is within 1%, it indicates that the actual luminance value deviation of each sub-pixel is small, and the luminance unevenness phenomenon is not obvious, so when the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value is within 1%, the luminance compensation may not be performed any more. Of course, setting the preset threshold to be 1% is a preferred embodiment in the embodiment of the present invention, and the preset threshold may be set to other values, for example, 0.5% or 2%, and needs to be determined according to the display requirements of the display panel.
In table 1, a is between 1% and 2%, which means that a is greater than or equal to 1% and less than 2%, i.e. the left side is equal, and other values of a are similar, for example, a is between 2% and 3%, which means that a is greater than or equal to 2% and less than 3%, which is not exemplified here. In specific implementation, each percentage range in the gray scale step value comparison table may also take other values, and may be set according to actual needs, and the adjustment step value corresponding to each percentage range may also be set according to actual needs, as shown in table 2, the value of b corresponding to each percentage range where a is greater than or equal to 1% is set to 1, and the effect of making the actual brightness of each sub-pixel substantially uniform can also be achieved through multiple compensations.
TABLE 2 gray scale step value LUT II
| a | <1％ | 1％～2％ | 2％～3％ | 3％～5％ | 5％～10％ | ≥10％ |
| b | 1 | 1 | 1 | 1 | 1 | 1 |
Referring to table 1, the value b in the table tends to increase with the increase of a, that is, the larger the percentage of the actual luminance value deviating from the target luminance value is, the larger the adjustment step value is, and with such a gray scale step value comparison table, the larger the deviation of the actual luminance value is, the larger the amplitude of the adjusted gray scale value is, so that the actual luminance value of each sub-pixel can quickly reach the target luminance value, and the target luminance value can generally be the average value of the actual luminance values of each sub-pixel, thereby achieving the effect of quickly making the actual luminance values of each sub-pixel uniform.
In practical applications, for the gray scale step value comparison table in which the percentage ranges and the adjustment step values shown in tables 1 and 2 are positive numbers, when the adjustment step value corresponding to each sub-pixel is determined, when the compensation gray scale value corresponding to each sub-pixel is determined, the compensation gray scale is determined by combining the actual luminance value and the target luminance value, when the actual luminance value is smaller than the target luminance value, the adjustment step value needs to be increased on the basis of the preset gray scale value, when the actual luminance value is greater than the target luminance value, the adjustment step value needs to be decreased on the basis of the preset gray scale value, for example, the target luminance value is 5nit, the actual luminance value of a certain sub-pixel is 5.5nit, the percentage of the actual luminance value of the sub-pixel deviating from the target luminance value is (5.5-5)/5-10%, according to the gray scale step value comparison table shown in table 1, 5 needs to be subtracted on the basis of the preset gray scale value, in order to avoid the subsequent step of comparing the actual brightness value with the target brightness value, the gray scale step value can be set to the form shown in table 3, for the gray scale step value comparison table shown in table 3, when the percentage of the actual brightness value deviating from the target brightness value is determined, the target brightness value is used to reduce the actual brightness value, and when the compensation gray scale value is determined, the preset gray scale value is used to add the corresponding adjustment step value, so that the step of comparing the actual brightness value with the target brightness value is omitted, the calculation process is further simplified, and the calculation time is reduced.
TABLE 3 Gray-scale stepping value comparison table III
| a | ≤-10 | -10％～-5％ | -5％～-3％ | -3％～-2％ | -2％～-1％ | <1％ |
| b | -5 | -4 | -3 | -2 | -1 | 0 |
| a | 1％～2％ | 2％～3％ | 3％～5％ | 5％～10％ | ≥10％ | |
| b | 1 | 2 | 3 | 4 | 5 |
The second method comprises the following steps: the gray scale stepping value comparison table comprises: a plurality of sub-lookup tables with different brightness levels; wherein the content of the first and second substances,
each sub-table includes: the percentage range of the actual brightness value deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
within the same percentage range, the adjustment stepping value is in an increasing trend along with the increase of the brightness level;
in step S204, the step value lookup table for the adjustment step value corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value includes:
determining the brightness level corresponding to the actual brightness value of each sub-pixel to determine a corresponding sub-comparison table;
according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value, searching the percentage range corresponding to each sub-pixel in the determined sub-comparison table;
and determining the adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
In the second mode, the gray scale step value comparison table is divided into a plurality of sub-comparison tables according to the brightness level, for example, the brightness value with the brightness level of 1 is between 0nit and 5nit, the brightness value with the brightness level of 2 is between 5nit and 10nit, when the adjustment step value is determined, different adjustment step values can be obtained according to different brightness levels, referring to table 4, the adjustment step value is in an increasing trend along with the increase of the brightness level in the same percentage range, for example, in 2% -3% of each sub-comparison table, the corresponding adjustment step value is 2, 3, … n +1 … along with the increase of the brightness level, so that the compensation gray scale value to be input can be adjusted according to the actual brightness value of each sub-pixel, and compared with the comparison table in the first mode, the repetition times of steps of brightness acquisition, gray scale compensation and compensation input can be reduced in a targeted manner, thereby increasing the calculation speed.
TABLE 4 Gray-scale stepping value look-up table
Referring to table 4, when determining the adjustment step value of each sub-pixel, it is necessary to determine the corresponding sub-comparison table according to the brightness level of the actual brightness value corresponding to each sub-pixel, for example, if the actual brightness value is 3nit, the brightness level of the sub-pixel is 1, the first sub-comparison table is adopted, and then the corresponding adjustment step value is looked up in the sub-comparison table. In table 4, the percentage range and the corresponding adjustment step value in each brightness level are preferred embodiments of the present invention, and may also be set to other values in specific implementation, and in the second embodiment, except that the sub comparison table is determined according to the brightness level, the implementation of other steps and the setting of the specific gray scale step value comparison table are added, the implementation of the embodiment in the first embodiment may be referred to, and repeated details are not repeated.
Based on the same inventive concept, embodiments of the present invention further provide a brightness compensation apparatus for a display panel, and since the principle of the brightness compensation apparatus for solving the problem is similar to the method described above, the implementation of the brightness compensation apparatus can refer to the implementation of the brightness compensation method described above, and repeated details are not repeated.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a luminance compensation device of a display panel according to an embodiment of the present invention; the brightness compensation device of the display panel comprises:
the first compensation module 41 is configured to perform brightness compensation on the display panel by using a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
the second compensation module 42 is configured to determine, according to the obtained compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value, the compensation gray-scale value of each sub-pixel corresponding to all the gray-scale values;
wherein, the first compensation module 41 includes:
a preset gray scale input module 411, configured to input the same preset gray scale value into each sub-pixel;
a brightness obtaining module 412, configured to obtain an actual brightness value displayed by each sub-pixel;
the gray scale compensation module 413 is configured to determine a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value, the target brightness value, and a preset gray scale step value comparison table of each sub-pixel if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is greater than a preset threshold;
a compensation gray scale input module 414 for inputting a corresponding compensation gray scale value to each sub-pixel;
the repeated compensation module 415 is configured to repeat the steps of luminance obtaining, gray scale compensation, and gray scale compensation input until the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value is smaller than a preset threshold.
FIG. 5 is a schematic structural diagram of a gray scale compensation module according to an embodiment of the present invention. Referring to fig. 5, in the luminance compensation apparatus according to the embodiment of the present invention, the gray scale compensation module 413 includes:
a step value determining unit 501, configured to search, according to a percentage of an actual luminance value of each sub-pixel deviating from a target luminance value, an adjustment step value corresponding to each sub-pixel in a gray scale step value comparison table;
the compensation gray-scale value determining unit 502 is configured to determine a compensation gray-scale value corresponding to each sub-pixel according to the adjustment step value corresponding to each sub-pixel and a preset gray-scale value.
Specifically, in the brightness compensation apparatus provided in the embodiment of the present invention, the gray scale stepping value comparison table includes: the percentage range of the actual brightness values deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
the step value determining unit 501 is specifically configured to:
determining the percentage range corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining the adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
Furthermore, in the brightness compensation apparatus provided by the embodiment of the present invention, the gray scale stepping value comparison table includes: a plurality of sub-lookup tables with different brightness levels; wherein the content of the first and second substances,
each sub-table includes: the percentage range of the actual brightness value deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
within the same percentage range, the adjustment stepping value is in an increasing trend along with the increase of the brightness level;
the gray scale compensation module 413 further includes:
the sub-lookup table determining unit 500 is configured to determine a luminance level corresponding to the actual luminance value of each sub-pixel to determine a corresponding sub-lookup table.
In a specific implementation, in the brightness compensation apparatus provided in an embodiment of the present invention, the target brightness value corresponding to the preset gray scale value is an average value of actual brightness values of the sub-pixels under the preset gray scale value.
In a specific implementation, in the brightness compensation apparatus provided in the embodiment of the present invention, the second compensation module 42 is specifically configured to:
and obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values through difference value operation according to the obtained compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value.
According to the brightness compensation method and the brightness compensation device provided by the embodiment of the invention, firstly, the brightness compensation is carried out on the display panel by adopting a plurality of preset gray-scale values, and the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values can be further obtained according to the compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value, so that when the display panel is used, the display panel can be lightened by combining the compensation gray-scale values of the sub-pixels, the phenomenon of uneven display can be eliminated, and the display effect of the display panel can be improved. In addition, in the process of performing brightness compensation on the display panel, the compensation gray scale corresponding to each sub-pixel is determined according to the actual brightness value, the target brightness value and the preset gray scale stepping value comparison table of each sub-pixel, the mode of determining the compensation gray scale is simple and direct, and the brightness compensation result is more reliable by combining the actual brightness value of each sub-pixel and continuously approaching the target brightness value through multiple times of compensation.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A method for compensating brightness of a display panel, comprising:
performing brightness compensation on the display panel by adopting a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
determining compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value;
and aiming at each preset gray-scale value, performing brightness compensation on the display panel according to the following method:
inputting a preset gray scale, and inputting the same preset gray scale value into each sub-pixel;
acquiring brightness, namely acquiring an actual brightness value displayed by each sub-pixel;
gray scale compensation, if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than a preset threshold value, determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value of each sub-pixel, the target brightness value and a preset gray scale stepping value comparison table;
compensation gray scale input, which inputs corresponding compensation gray scale values to each sub-pixel;
repeating the steps of obtaining the brightness, compensating the gray scale and inputting the compensation gray scale until the percentage of the actual brightness value corresponding to the compensation gray scale value of each sub-pixel deviating from the target brightness value is smaller than the preset threshold value;
wherein, the determining the compensation gray scale value corresponding to each sub-pixel according to the actual brightness value, the target brightness value, and the preset gray scale stepping value comparison table comprises:
searching an adjustment stepping value corresponding to each sub-pixel in the gray scale stepping value comparison table according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining a compensation gray-scale value corresponding to each sub-pixel according to the adjustment stepping value corresponding to each sub-pixel and the preset gray-scale value.
2. The method of claim 1, wherein the gray scale step value lookup table comprises: the percentage range of the actual brightness values deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
the searching, according to the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value, for the adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table includes:
determining the percentage range corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining an adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
3. The method of claim 2, wherein the percentage ranges in the gray scale step value lookup table and the corresponding relationship between the adjustment step values are:
when a < 1%, b is 0; when a is more than or equal to 1% and less than 2%, b is 1; when a is more than or equal to 2% and less than 3%, b is 2; when a is more than or equal to 3% and less than 5%, b is 3; when a is more than or equal to 5% and less than 10%, b is 4; when a is more than or equal to 10%, b is 5;
wherein, a represents the percentage of the actual brightness value deviating from the target brightness value, and b represents the adjustment stepping value;
the searching, according to the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value, for the adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table specifically includes:
judging whether the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value is less than 1%;
if yes, the corresponding adjustment stepping value of the sub-pixel is 0; and if not, determining a corresponding adjustment stepping value according to the percentage range of the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value.
4. The method of claim 1, wherein the gray scale step value lookup table comprises: a plurality of sub-lookup tables with different brightness levels; wherein the content of the first and second substances,
each of the sub-lookup tables includes: the actual brightness value deviates from the percentage range of the target brightness value, and the adjustment stepping value corresponding to each percentage range;
within the same percentage range, the adjustment stepping value is in an increasing trend along with the increase of the brightness level;
the searching, according to the percentage of the actual luminance value of each sub-pixel deviating from the target luminance value, for the adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table includes:
determining the brightness level corresponding to the actual brightness value of each sub-pixel to determine a corresponding sub-comparison table;
according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value, searching the percentage range corresponding to each sub-pixel in the determined sub-comparison table;
and determining an adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
5. The method according to any of claims 1-4, wherein the target luminance value corresponding to the predetermined gray scale value is an average of actual luminance values of the sub-pixels at the predetermined gray scale.
6. The method according to any one of claims 1 to 4, wherein the determining the compensated gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensated gray-scale values of the sub-pixels corresponding to each of the preset gray-scale values comprises:
and obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values through difference value operation according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value.
7. A luminance compensation apparatus of a display panel, comprising:
the first compensation module is used for performing brightness compensation on the display panel by adopting a plurality of preset gray-scale values to obtain a compensation gray-scale value of each sub-pixel corresponding to each preset gray-scale value;
the second compensation module is used for determining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value;
wherein the first compensation module comprises:
the preset gray scale input module is used for inputting the same preset gray scale value into each sub-pixel;
the brightness acquisition module is used for acquiring the actual brightness value displayed by each sub-pixel;
the gray scale compensation module is used for determining a compensation gray scale value corresponding to each sub-pixel according to the actual brightness value of each sub-pixel, the target brightness value and a preset gray scale stepping value comparison table if the percentage of the actual brightness value of the sub-pixel deviating from the target brightness value is larger than a preset threshold;
the compensation gray scale input module is used for inputting corresponding compensation gray scale values to the sub-pixels;
the repeated compensation module is used for repeating the steps of brightness acquisition, gray scale compensation and compensation gray scale input until the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value is smaller than the preset threshold value;
wherein, the gray scale compensation module comprises:
a step value determining unit, configured to search, according to a percentage of an actual luminance value of each sub-pixel deviating from the target luminance value, an adjustment step value corresponding to each sub-pixel in the gray-scale step value comparison table;
and the compensation gray-scale value determining unit is used for determining the compensation gray-scale value corresponding to each sub-pixel according to the adjustment stepping value corresponding to each sub-pixel and the preset gray-scale value.
8. The apparatus of claim 7, wherein the gray scale step value lookup table comprises: the percentage range of the actual brightness values deviating from the target brightness value and the adjustment stepping value corresponding to each percentage range;
the step value determining unit is specifically configured to:
determining the percentage range corresponding to each sub-pixel according to the percentage of the actual brightness value of each sub-pixel deviating from the target brightness value;
and determining an adjustment stepping value corresponding to each sub-pixel according to the percentage range corresponding to each sub-pixel.
9. The apparatus of claim 7, wherein the gray scale step value lookup table comprises: a plurality of sub-lookup tables with different brightness levels; wherein the content of the first and second substances,
each of the sub-lookup tables includes: the actual brightness value deviates from the percentage range of the target brightness value, and the adjustment stepping value corresponding to each percentage range;
within the same percentage range, the adjustment stepping value is in an increasing trend along with the increase of the brightness level;
the gray scale compensation module further comprises:
and the sub comparison table determining unit is used for determining the brightness level corresponding to the actual brightness value of each sub pixel so as to determine the corresponding sub comparison table.
10. The apparatus according to any one of claims 7-9, wherein the target luminance value corresponding to the predetermined gray-scale value is an average value of actual luminance values of the sub-pixels at the predetermined gray-scale value.
11. The apparatus according to any of claims 7-9, wherein the second compensation module is specifically configured to:
and obtaining the compensation gray-scale values of the sub-pixels corresponding to all the gray-scale values through difference value operation according to the obtained compensation gray-scale values of the sub-pixels corresponding to each preset gray-scale value.
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| CN105741763A (en) * | 2016-03-31 | 2016-07-06 | 深圳市华星光电技术有限公司 | Method for eliminating Mura of OLED display panel |
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| CN105304024A (en) * | 2015-11-30 | 2016-02-03 | 上海天马有机发光显示技术有限公司 | Display panel pixel current compensation method and system |
| CN105741763A (en) * | 2016-03-31 | 2016-07-06 | 深圳市华星光电技术有限公司 | Method for eliminating Mura of OLED display panel |
| CN106531049A (en) * | 2016-12-19 | 2017-03-22 | 上海天马有机发光显示技术有限公司 | Brightness adjusting method and system of display panel |
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