CN108630148B - Method for compensating brightness difference of display panel and display - Google Patents
Method for compensating brightness difference of display panel and display Download PDFInfo
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- CN108630148B CN108630148B CN201810393943.3A CN201810393943A CN108630148B CN 108630148 B CN108630148 B CN 108630148B CN 201810393943 A CN201810393943 A CN 201810393943A CN 108630148 B CN108630148 B CN 108630148B
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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
- G09G3/3258—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 voltage across the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a compensation method for brightness difference of a display panel and a display, wherein the compensation method comprises the steps of dividing the display panel into a plurality of areas, and determining one area as a reference area; judging whether the difference value between the brightness of the other areas and the brightness of the reference area is within a preset range or not; if the difference value is not within the preset range, calculating a compensation voltage value required to be compensated by a light-emitting element in the display panel according to the brightness and the luminous efficiency of the reference area; the voltage value for supplying power to the luminous elements in the display panel is added with the compensation voltage value on the original basis, and then the current value is compensated. The compensation method can improve the brightness uniformity of the display panel, thereby improving the display quality of the liquid crystal panel.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a method for compensating for brightness difference of a display panel and a display.
Background
With the development of display technology, the AMOLED display technology is gradually mature. Compared with LCD display, the LCD display has the advantages of high brightness, full color, high contrast, lower driving voltage, faster response time and the like. The AMOLED display screen also gradually comes into the market, and tends to replace the conventional LCD display. As a next generation display technology, AMOLED display has a good development prospect.
Because every pixel of AMOLED can both give out light alone, there is the pixel circuit to walk the existence of line impedance on the AMOLED screen to the picture luminance that leads to being close to drive circuit end is bright on a par, and the picture from the drive circuit end than far away leads to luminance dark on a par because of walking the line impedance great, and this makes display panel's luminance inhomogeneous, influences display effect.
Therefore, it is necessary to provide a method for compensating for the brightness difference of the display panel and a display to solve the above-mentioned technical problems.
Disclosure of Invention
The technical problem mainly solved by the application is to provide a compensation method for brightness difference of a display panel and a display.
In order to solve the above technical problem, a first technical solution adopted by the present application is to provide a method for compensating for a luminance difference of a display panel, the method comprising: dividing the display panel into a plurality of areas, and determining one area as a reference area; judging whether the difference value between the brightness of other areas and the brightness of the reference area is within a preset range or not; if the difference value is not within the preset range, calculating a compensation voltage value required to be compensated by a light emitting element in the display panel according to the brightness and the luminous efficiency of the reference area; the compensation voltage value is added to the voltage value for supplying power to the light-emitting elements in the display panel on the basis of the original voltage value.
In order to solve the above technical problem, a second technical solution adopted by the present application is to provide a display, a display panel of the display includes a plurality of display regions, and a supply voltage of a light emitting element corresponding to at least one of the display regions is greater than or less than a supply voltage of a light emitting element corresponding to a reference region, so that a luminance of the display panel is uniform.
The beneficial effect of this application is: different from the prior art, the brightness of the light-emitting element on the display panel, which is generally close to the driving circuit board, is stronger than that of the light-emitting element far away from the driving circuit board, the compensation method of the application comprises the steps of dividing the display panel into a plurality of areas according to the difference of the light-emitting brightness, and determining one area as a reference area; judging whether the difference value between the brightness of the other areas and the brightness of the reference area is within a preset range or not; if the difference value is not within the preset range, calculating a compensation voltage value required to be compensated by a light-emitting element in the display panel according to the brightness and the luminous efficiency of the reference area; the voltage value for supplying power to the luminous elements in the display panel is added with the compensation voltage value on the original basis, and then the current value is compensated. The compensation method can improve the brightness uniformity of the display panel, thereby improving the display quality of the liquid crystal panel.
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FIG. 1 is a flowchart illustrating an embodiment of a method for compensating for a brightness difference of a display panel according to the present disclosure;
FIG. 2 is a schematic structural diagram of an embodiment of region division of a display panel provided in the present application;
fig. 3 is a schematic structural diagram of an embodiment of a display provided in 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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.
The brightness of the light-emitting elements close to the driving circuit board on the display panel is generally stronger than that of the light-emitting elements far away from the driving circuit board, and in order to compensate the difference of the light-emitting brightness of the light-emitting elements on the display panel, namely compensate the current value of the light-emitting elements, the display panel is divided into a plurality of areas according to the brightness difference of the light-emitting elements, one area is determined as a reference area, then the compensation voltage value required to be compensated by the light-emitting elements in the display panel is calculated according to the brightness of the reference area, and further the current value is compensated.
To describe in detail how to compensate for the brightness difference of the light emitting elements of the display panel, the following description will take the example of dividing the display panel into three regions.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating an embodiment of a method for compensating for a brightness difference of a display panel according to the present disclosure.
Step 101: the display panel is divided into a plurality of areas, and one area is determined as a reference area.
In this embodiment, the display panel is divided into three regions, i.e., a first region a, a second region b, and a third region c, according to the difference in luminance of the light emitting elements. In other embodiments, the display panel may be further divided into two regions, four regions, five regions or a greater number of regions, which is not limited herein.
The light-emitting element in this embodiment is specifically a light-emitting pixel in a display panel.
Specifically, as shown in fig. 2, fig. 2 is a schematic structural diagram of an embodiment of area division of a display panel provided in the present application. DIC in fig. 2 represents a driving circuit board of the display panel 20, and P represents a light emitting element in the display panel. The first area a is an area closest to the driving circuit board DIC, the power transmission line between the light-emitting element P and the driving circuit board DIC in the area is shortest, and the resistance of the power transmission line is smallest, so that the brightness of the area is brightest; the second area b is an area close to the driving circuit board DIC, the power transmission line between the light-emitting element P and the circuit board DIC in the area is short, and the resistance of the power transmission line is large, so that the brightness of the light-emitting element P in the area is bright; the third area c is an area farthest from the driving circuit board DIC, the power transmission line between the light emitting element P and the circuit board DIC is longest in this area, and the resistance of the power transmission line is largest, so that the brightness of the light emitting element P in this area is darkest.
Generally, the brightness of the light emitting elements P in the second region b is moderate and is more suitable for human eyes to view, so the second region b is selected as the reference region in this embodiment, and the first region a or the third region c may be selected as the reference region in other embodiments.
In this embodiment, the areas of the first region a, the second region b, and the third region c are equal, and in other embodiments, the areas of the first region a, the second region b, and the third region c may also be unequal, which is not specifically limited herein.
In this embodiment, the first region a, the second region b, and the third region c are all rectangular, and in other embodiments, the first region a, the second region b, and the third region c may also be in any other shapes, which is not limited herein.
Step 102: and judging whether the difference value between the brightness of the other areas and the brightness of the reference area is within a preset range.
In this embodiment, the reference region is the second region b, and the other regions are the first region a and the third region c. That is, it is necessary to determine whether the luminance difference value between the first area a and the second area b and the luminance difference value between the third area c and the second area b are both within the preset range. And if only the brightness difference value of the first area a and the second area b is not in the preset range, or only the brightness difference value of the third area c and the second area b is not in the preset range, or the brightness difference value of the first area a and the second area and the brightness difference value of the third area c and the second area b are not in the preset range, performing the next step.
Specifically, the luminous fluxes of the first region a, the second region b, and the third region c, which are the luminance of the light emitting element P, are obtained by an optical analyzer, and then the luminance difference between the first region a and the second region b and the luminance difference between the third region c and the second region b are obtained.
More specifically, in the present embodiment, the average value of the light-emission luminances of the first region a, the second region b, and the third region c is further acquired from the acquired luminance values of the light-emitting elements P in the three regions a, b, and c. And obtaining the difference value of the brightness average values of the first area a and the second area b and the difference value of the brightness average values of the second area b and the third area c according to the average values of the brightness of the three areas a, b and c, and then judging whether the difference values are in a preset range.
In other embodiments, the luminance value of one light-emitting element P in the second region b of the reference region is selected as the light-emitting reference luminance based on the acquired luminance values of the light-emitting elements P in the three regions a, b, c, the average value of the luminance of the light-emitting elements P in the first region a is compared with the light-emitting reference luminance, and the average value of the luminance of the light-emitting elements P in the third region c is compared with the light-emitting reference luminance.
In further embodiments, it is also possible to compare the luminance of each light-emitting element P in the first region a with the average value of the light-emission luminance in the second region b, and to compare the luminance of each light-emitting element P in the third region c with the average value of the light-emission luminance in the second region b.
In further embodiments, it is also possible to compare the luminance value of each light-emitting element P in the first region a with the light-emission reference luminance in the second region b, and to compare the luminance value of each light-emitting element P in the third region c with the light-emission reference luminance in the second region b.
In other cases, if the brightness difference value between the first area a and the second area b and the brightness difference value between the third area c and the second area b are both within the preset range, no adjustment is performed.
Step 103: and if the difference is not in a preset range, calculating a compensation voltage value required to be compensated by the light-emitting element in the display panel according to the brightness and the luminous efficiency of the reference area.
In one embodiment, if the luminance difference between the first area a or the third area c and the second area b is not within the preset range, according to the formula: the output current is the luminous flux/luminous efficiency, and the average value of the output current values of the light emitting elements P in the second region b is calculated. The luminous flux is an average value of the luminous brightness of the second region b, and the luminous efficiency is an average value of the luminous efficiency of the second region b, and the luminous efficiency is determined by the material property of the light emitting element P itself. Then according to the formula:
calculating to obtain the compensation voltage value to be compensated for the light emitting device P in the display panel 20, wherein Vref represents the compensation voltage value to be compensated for the light emitting device P in the display panel 20,
represents an average value of output current values of the light emitting elements P in the second region b, K represents a coefficient of the light emitting elements P in the display panel 20, Vdata represents a data voltage of the light emitting elements P in the display panel 20, and Vdd represents a power supply voltage value of the light emitting elements P in the display panel 20.
In another embodiment, if the difference between the light emitting reference luminance of the first area a or the third area c and the second area b is not within the preset range, according to the formula: the output current is the luminous flux/luminous efficiency, and a current value corresponding to the light emission reference luminance of one light-emitting element P in the second region b is calculated. Wherein, the luminous flux is the light-emitting reference brightness of the one light-emitting element P in the second region b, and the luminous efficiency is the luminous efficiency of the one light-emitting element P in the second region b. Then according to the formula:
calculating to obtain a compensation voltage value to be compensated for the light emitting element P in the display panel 20, wherein Vref represents the compensation voltage value to be compensated for the light emitting element P in the display panel 20, I represents a current value corresponding to the reference luminance of the light emitting element P in the second region b, and K represents the light emitting element in the display panel 20The coefficient of the element P, Vdata represents the data voltage of the light emitting element P in the display panel 20, and Vdd represents the power supply voltage value of the light emitting element P in the display panel 20.
Step 104: the compensation voltage value is added to the voltage value for supplying power to the light-emitting elements in the display panel on the basis of the original voltage value.
In step 103, the compensation voltage value to be compensated for the light emitting elements P in the display panel 20 has been calculated, and in this step 104, the driving circuit board DIC in the display panel 20 adds the corresponding compensation voltage value to the original power supply voltage value of the light emitting elements P, so as to compensate the current values of the light emitting elements P in the first area a that is brighter and the third area c that is darker, that is, compensate the brightness difference.
In other embodiments, step 105 may be further included after step 104, where step 105 specifically is: judging whether the difference value between the brightness of the other areas and the brightness of the reference area is within a preset range or not; if the difference value is not in the preset range, the steps are repeated to carry out compensation again, and if the difference value is in the preset range, adjustment is not carried out. The specific process of step 105 is similar to the above description, and is not repeated here.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a display according to an embodiment of the present disclosure. The display panel of the display comprises a plurality of display areas, and the power supply voltage of the light-emitting element corresponding to at least one display area is greater than or less than the power supply voltage of the light-emitting element corresponding to the reference area, so that the light-emitting brightness of the display panel is uniform. Specifically, as shown in fig. 3, the display panel 301 of the display 30 includes three display areas a, b, and c, wherein the second area b is a reference area, and the difference between the current values is compensated by adjusting the power supply voltage values of the first area a and the third area c, so that the light emitting luminances of the three display areas a, b, and c are uniform.
Different from the prior art, the brightness of the light-emitting element on the display panel, which is generally close to the driving circuit board, is stronger than that of the light-emitting element far away from the driving circuit board, the compensation method of the application comprises the steps of dividing the display panel into a plurality of areas according to the difference of the light-emitting brightness, and determining one area as a reference area; judging whether the difference value between the brightness of the other areas and the brightness of the reference area is within a preset range or not; if the difference value is not within the preset range, calculating a compensation voltage value required to be compensated by the light-emitting element in the display panel according to the brightness of the reference area; the voltage value for supplying power to the luminous elements in the display panel is added with the compensation voltage value on the original basis, and then the current value is compensated. The compensation method can improve the brightness uniformity of the display panel, thereby improving the display quality of the liquid crystal panel.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (7)
1. A method for compensating brightness difference of a display panel is characterized by comprising the following steps:
dividing the display panel into a plurality of areas, and determining an area with moderate brightness as a reference area, wherein the light flux of the area is obtained by an optical analysis instrument for determination;
judging whether the difference value between the average value of the brightness of the light-emitting elements in the other areas and the average value of the brightness of the light-emitting elements in the reference area is within a preset range or not;
if the difference value is not in the preset range, the average value of the brightness of the light-emitting elements in the reference area and the average value of the luminous efficiency of the light-emitting elements in the reference area are determined through a formula: calculating an average value of output current values of the light-emitting elements in the reference region, wherein the output current is a luminous flux/luminous efficiency, and the luminous flux is an average value of luminance of the light-emitting elements in the reference region and the luminous efficiency is an average value of luminous efficiency of the light-emitting elements in the reference region;
according to the formula
Calculating to obtain a compensation voltage value required to be compensated by the light emitting element in the display panel, wherein Vref represents the compensation voltage value required to be compensated by the light emitting element in the display panel,
represents an average value of output current values of the light emitting elements in the reference region, K represents a coefficient of the light emitting elements in the display panel, Vdata represents a data voltage of the light emitting elements in the display panel, and Vdd represents a voltage value to which the light emitting elements in the display panel are supplied;
the compensation voltage value is added to the voltage value for supplying power to the light-emitting elements in the display panel on the basis of the original voltage value.
2. The compensation method of claim 1, wherein the light emitting elements are light emitting pixels in the display panel.
3. The compensation method according to claim 1, wherein the step of adding the compensation voltage value to the voltage value for supplying power to the light emitting elements in the display panel comprises:
and adding the compensation voltage value to the voltage value for supplying power to the light-emitting element in the display panel on the original basis through a driving circuit board in the display panel.
4. The compensation method as claimed in claim 1, wherein the step of adding the compensation voltage value to the voltage value for supplying power to the light emitting elements in the display panel further comprises:
judging whether the difference value between the brightness of other areas and the brightness of the reference area is within a preset range or not;
if the difference value is not in the preset range, repeating the steps to compensate again.
5. The compensation method of claim 4, wherein if the difference is within a predetermined range, no adjustment is performed.
6. A method for compensating brightness difference of a display panel is characterized by comprising the following steps:
dividing the display panel into a plurality of areas, and determining an area with moderate brightness as a reference area, wherein the light flux of the area is obtained by an optical analysis instrument for determination;
judging whether the difference value between the average value of the brightness of the light-emitting elements in the other areas and the brightness of one light-emitting element in the reference area is within a preset range or not;
if the difference is not within a preset range, according to the brightness of one light-emitting element in the reference region and the luminous efficiency of the one light-emitting element in the reference region, a formula is used for: calculating an output current value of the one light emitting element in the reference region, where the output current is a luminous flux/a luminous efficiency, and the luminous flux is a luminance of the one light emitting element in the reference region, and the luminous efficiency is a luminous efficiency of the one light emitting element in the reference region;
according to the formula
Calculating to obtain a compensation voltage value required to be compensated by the light emitting element in the display panel, wherein Vref represents the compensation voltage value required to be compensated by the light emitting element in the display panel, I represents the output current value of the light emitting element in the reference region, K represents the coefficient of the light emitting element in the display panel, Vdata represents the data voltage of the light emitting element in the display panel, and Vdd represents the voltage value supplied by the light emitting element in the display panel;
the compensation voltage value is added to the voltage value for supplying power to the light-emitting elements in the display panel on the basis of the original voltage value.
7. A display, characterized in that, the display panel of the display comprises a plurality of display areas, the supply voltage of the luminous element corresponding to at least one of the display areas is larger or smaller than the supply voltage of the luminous element corresponding to the reference area, and the compensation method of any one of claims 1 to 5 or claim 6 is used to make the luminous brightness of the display panel uniform.
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