CN105632450A - Correction method and device for display panel - Google Patents
Correction method and device for display panel Download PDFInfo
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- CN105632450A CN105632450A CN201610213422.6A CN201610213422A CN105632450A CN 105632450 A CN105632450 A CN 105632450A CN 201610213422 A CN201610213422 A CN 201610213422A CN 105632450 A CN105632450 A CN 105632450A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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Abstract
The embodiment of the invention provides a correction method and device for a display panel. The correction method comprises the following steps: determining a first common voltage value loaded when display uniformity parameters of the display panel reach an optimal state; aiming at each region of the divided display panel, respectively determining a second common voltage value loaded when the display uniformity parameters of each region reach an optimal state; determining a compensating voltage value of each region according to the first common voltage value and the second common voltage value; and regulating a data voltage value of each region according to the compensating voltage value. According to the correction method for the display panel, provided by the embodiment of the invention, by regulating the data voltage of each region respectively, the common voltages of different regions on the same panel are basically same after the data voltage is coupled to the common voltages, so that the problems that the color is greenish, the flicker uniformity is poor, residual images are aggravated, and the like of the display panel are alleviated.
Description
Technical field
The present invention relates to technique of display field, the correction method of espespecially a kind of display panel and device.
Background technology
Liquid-crystal display (LiquidCrystalDisplay, LCD) is widely used due to its feature such as light, thin, low in energy consumption.
For large scale liquid crystal display panel, owing to panel load (Panelload) is bigger, namely in display panels, the electric capacity Cst of transistor is bigger, the liquid crystal discharge and recharge time is long, after such liquid crystal discharge and recharge, data voltage is bigger to the coupling of common electric voltage (VCOM), as shown in Figure 1, in figure, Data1, Data2, Data3 and Data4 represents the data voltage of input, VCOM represents common electric voltage, as can be seen from Figure 1, due to data voltage Data1, Data2, Data3 and Data4 is to the coupling of common electric voltage VCOM, VCOM voltage is changed, cause the common electric voltage of same panel different zones different, and then there will be panel Greenish (partially green), the phenomenon that panel Flicker (flicker) homogeneity difference and residual picture increase the weight of, Fig. 2 tests under pattern pattern at Greenish in prior art, there is the schematic diagram of display uneven phenomenon in panel.
Summary of the invention
The embodiment of the present invention provides correction method and the device of a kind of display panel, different in order to alleviate in prior art the common electric voltage due to same panel different zones existed, the panel flash value occurred or the problem that inclined value of green homogeneity is poor and residual picture increases the weight of.
Embodiments provide a kind of correction method of display panel, comprising:
Determine the first common electric voltage value that display panel loads when showing homogeneity parameter and reach optimum regime;
Perform respectively for each region after display panel divides:
Determine the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime;
The offset voltage value in described region is determined according to described first common electric voltage value and described 2nd common electric voltage value;
The data voltage in described region is regulated according to described offset voltage value.
In a kind of possible enforcement mode, in the aforesaid method that the embodiment of the present invention provides, described display homogeneity parameter is the flicker value of display;
Described determine display panel first common electric voltage value of loading when showing homogeneity parameter and reach optimum regime, specifically comprise: determine the first common electric voltage value that display panel loads when the flicker value showing center position is minimum;
Described determine the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime, specifically comprise: determine the 2nd common electric voltage value that the flicker value of heart position in this region, each described region loads time minimum.
In a kind of possible enforcement mode, in the aforesaid method that the embodiment of the present invention provides, described display homogeneity parameter is the inclined value of green of display;
Described determine display panel first common electric voltage value of loading when showing homogeneity parameter and reach optimum regime, specifically comprise: determine the first common electric voltage value that display panel loads when the inclined value of green showing center position is minimum;
Described determine the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime, specifically comprise: determine the 2nd common electric voltage value that the inclined value of green of heart position in this region, each described region loads time minimum.
In a kind of possible enforcement mode, in the aforesaid method that the embodiment of the present invention provides, the described offset voltage value determining described region according to described first common electric voltage value and described 2nd common electric voltage value, specifically comprises:
Using the offset voltage value of the difference of described first common electric voltage value and described 2nd common electric voltage value as described region.
In a kind of possible enforcement mode, in the aforesaid method that the embodiment of the present invention provides, the described data voltage regulating described region according to described offset voltage value, specifically comprises:
The data voltage loaded when the data voltage sum of described offset voltage value and described region is shown as described region.
In a kind of possible enforcement mode, the embodiment of the present invention provide aforesaid method in, described regulate the data voltage in described region according to described offset voltage value after, also comprise:
When described display homogeneity parameter after determining described region adjustment data voltage can not reach setting threshold value, redefine described first common electric voltage value, described 2nd common electric voltage value and described offset voltage value, and regulate the data voltage in described region according to the offset voltage value redefined until the described display homogeneity parameter in described region after regulating reaches described setting threshold value.
The embodiment of the present invention additionally provides the correction device of a kind of display panel, comprising:
First determining unit, for determining the first common electric voltage value that display panel loads when showing homogeneity parameter and reach optimum regime;
2nd determining unit, for for each region after display panel division, it is determined that the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime;
3rd determining unit, for for each region, determining the offset voltage value in described region according to described first common electric voltage value and described 2nd common electric voltage value;
Regulate unit, for for each region, regulating the data voltage in described region according to described offset voltage value.
In a kind of possible enforcement mode, in the said apparatus that the embodiment of the present invention provides, described display homogeneity parameter is the flicker value of display;
Described first determining unit, specifically for determining the first common electric voltage value that display panel loads when the flicker value showing center position is minimum;
Described 2nd determining unit, the 2nd common electric voltage value loaded time minimum specifically for determining the flicker value of heart position in this region, each described region.
In a kind of possible enforcement mode, in the said apparatus that the embodiment of the present invention provides, described display homogeneity parameter is the inclined value of green of display;
Described first determining unit, specifically for determining the first common electric voltage value that display panel loads when the inclined value of green showing center position is minimum;
Described 2nd determining unit, the 2nd common electric voltage value loaded time minimum specifically for determining the inclined value of green of heart position in this region, each described region.
In a kind of possible enforcement mode, in the said apparatus that the embodiment of the present invention provides, described 3rd determining unit, specifically for using the offset voltage value of the difference of described first common electric voltage value and described 2nd common electric voltage value as described region.
In a kind of possible enforcement mode, in the said apparatus that the embodiment of the present invention provides, described value regulates unit, the data voltage loaded during specifically for the data voltage sum of described offset voltage value and described region being shown as described region.
In a kind of possible enforcement mode, in the said apparatus that the embodiment of the present invention provides, described device also comprises:
Amending unit, when can not reach setting threshold value for the described display homogeneity parameter after determining described region adjustment data voltage, redefine described first common electric voltage value, described 2nd common electric voltage value and described offset voltage value, and regulate the data voltage in described region according to the offset voltage value redefined until the described display homogeneity parameter in described region after regulating reaches described setting threshold value.
The useful effect of the present invention is as follows:
The correction method of a kind of display panel that the embodiment of the present invention provides, by determining the first common electric voltage value that display panel loads when showing homogeneity parameter and reach optimum regime; Perform respectively for each region after display panel divides: determine the 2nd common electric voltage value that each region loads when showing homogeneity parameter and reach optimum regime; The offset voltage value in region is determined according to the first common electric voltage value and the 2nd common electric voltage value; Data voltage according to offset voltage value regulation domain. The correction method of a kind of display panel that the embodiment of the present invention provides, by respectively the data voltage in each region being regulated, after making data voltage be coupled on common electric voltage, the common electric voltage of same panel different zones is roughly the same, thus alleviate that the color that display panel produces is partially green, flicker homogeneity difference and residual picture the problem such as increase the weight of.
Accompanying drawing explanation
Fig. 1 is after in prior art, data voltage and common electric voltage are coupled, the schematic diagram that common electric voltage changes;
Fig. 2 common electric voltage change rear panel occur display uneven phenomenon schematic diagram;
One of schema of correction method of a kind of display panel that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram of the display panel dividing mode that Fig. 4 provides for the embodiment of the present invention;
The correction method correction rear drive voltage of a kind of display panel that Fig. 5 provides for the embodiment of the present invention generates schematic diagram;
The two of the schema of the correction method of a kind of display panel that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the correction device of a kind of display panel that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Different for the common electric voltage due to same panel different zones existed in prior art, the panel flash value occurred or the problem that inclined value of green homogeneity is poor and residual picture increases the weight of. Below in conjunction with accompanying drawing, a kind of correction method of display panel and the embodiments of device that provide the embodiment of the present invention are described in detail.
Embodiments provide a kind of correction method of display panel, as shown in Figure 3, specifically comprise the following steps:
S101, determine display panel when showing homogeneity parameter and reach optimum regime the first common electric voltage value of loading;
Perform respectively for each region after display panel divides:
S102, determine each region when showing homogeneity parameter and reach optimum regime the 2nd common electric voltage value that loads;
S103, the offset voltage value determining each region according to the first common electric voltage value and the 2nd common electric voltage value;
S104, regulate the data voltage in each region according to offset voltage value.
The correction method of a kind of display panel that the embodiment of the present invention provides, by respectively the data voltage in each region being regulated, after making data voltage be coupled on common electric voltage, the common electric voltage of same panel different zones is roughly the same, thus alleviate that the color that display panel produces is partially green, flicker homogeneity difference and residual picture the problem such as increase the weight of.
Below the specific implementation of above steps is described in detail.
In above-mentioned steps S101, regulate the common electric voltage value of display panel, there is corresponding change along with the change of common electric voltage value in the homogeneity parameter of this display panel, the common electric voltage value loaded when the homogeneity parameter obtaining this display panel reaches optimum regime is the first common electric voltage. The enforcement mode of step S102 and step S101 is similar, and difference is, step S102 determines order two common electric voltage values for each region after display panel division.
Before performing step S102, the method also comprises: display panel is divided into multiple region. When dividing region, it is preferable to evenly divide along data line direction, as shown in Figure 4, to be evenly divided into 9 regions along data line direction in Fig. 4, in figure, Data1 ... DataX represents and comprises X data line in zone 1, and in figure, R, G, the B in the upper left corner represents and comprise multiple pixel in region 1. In the specific implementation, uneven division can also be adopted, or divide along other directions, can also divide along multiple directions formed latticed etc., the areal obtained after dividing mode and division is not limited herein, it should be appreciated that the areal obtained after dividing is more many, the display effect obtained after subsequent adjustment data voltage is more good.
Specifically, when above-mentioned display homogeneity parameter is the flicker value of display, above-mentioned steps S101 can specifically comprise: determines the first common electric voltage value that display panel loads when the flicker value showing center position is minimum.
Above-mentioned steps S102 can specifically comprise: determines the 2nd common electric voltage value that the flicker value of heart position in the zone, each region loads time minimum.
When above-mentioned display homogeneity parameter is the flicker value of display, when regulating common electric voltage, panel can along with the change between a minimum value and a maximum value of common electric voltage value in the flicker value of display center position, obtaining the common electric voltage value loaded when flicker value reaches minimum value is the first common electric voltage, adopt in the same way again, obtain the 2nd common electric voltage value in each region after dividing region. In fact above-mentioned central position refers near each region (or display panel) geometric centre a region within the scope of certain, as shown in the border circular areas in Fig. 4, is not only limited to geometric center point place.
Or, specifically, when above-mentioned display homogeneity parameter is the inclined value of green of display, above-mentioned steps S101 can specifically comprise: determines the first common electric voltage value that display panel loads when the inclined value of green showing center position is minimum;
Above-mentioned steps S102 can specifically comprise: determines the 2nd common electric voltage value that the inclined value of green of heart position in the zone, each region loads time minimum.
When above-mentioned display homogeneity parameter is the inclined value of green of display, when regulating common electric voltage, panel can along with the change between a minimum value and a maximum value of common electric voltage value in the inclined value of green of display center position, obtaining the common electric voltage value loaded when inclined value of green reaches minimum value is the first common electric voltage, adopt in the same way again, obtain the 2nd common electric voltage value in each region after dividing region.
In step S101 and step S102, the first common electric voltage value or the 2nd common electric voltage value is determined by judging the flicker value (or inclined value of green) of display center position, be the embodiment of the present invention preferred embodiment, the flicker value (or partially value of green) that can also pass through other positions of panel (such as deviateing certain position of central position, 1/3rd places of face plate center line, certain apex etc.) in the specific implementation determines the first common electric voltage value or the 2nd common electric voltage value. Further, by flicker value or partially value of green determine the first common electric voltage value and the 2nd common electric voltage value be also the embodiment of the present invention preferred embodiment, can also be replaced by other display homogeneity parameter in the specific implementation.
Specifically, above-mentioned steps S103 can specifically comprise:
Using the offset voltage value of the difference of the first common electric voltage value and the 2nd common electric voltage value as each region.
In step s 103, using the difference of the first common electric voltage value and the 2nd common electric voltage value as the offset voltage value in each region be the embodiment of the present invention preferred embodiment, offset voltage value can also be determined in the specific implementation by other means, such as can get the first common electric voltage value and the mean value of the 2nd common electric voltage value, or the multiple etc. of the difference of the first common electric voltage value and the 2nd common electric voltage value can be got.
Specifically, above-mentioned steps S104 can specifically comprise:
The data voltage loaded when the data voltage sum of offset voltage value and this region is shown as this region.
In step S104, when the data voltage sum of offset voltage value and this region is shown as this region load data voltage be the embodiment of the present invention preferred embodiment, other compensation ways can also be adopted in the specific implementation. For the data voltage that input is certain, through the adjustment of different offset voltage values or different compensation ways, obtain one can the data voltage of value within the specific limits, as shown in Figure 5, in figure, Gamma1 and Gamma2 represents the value of data voltage, Gray (1��x) represents gray-scale value, by figure it will be seen that for gray-scale value within the scope of 1��x, data voltage can between Gamma1 and Gamma2 value, instead of the value that is determined.
Specifically, the correction method of a kind of display panel that the embodiment of the present invention provides, also comprises not shown:
S105, when determining that each region regulates the display homogeneity parameter after data voltage can not reach setting threshold value, redefine the first common electric voltage value, the 2nd common electric voltage value and offset voltage value, and regulate the data voltage in each region according to the offset voltage value redefined until the display homogeneity parameter in each region after regulating reaches setting threshold value.
When again regulating, it is possible to adopt other mode to determine offset voltage value, or other compensation way can be adopted, it is also possible to display panel is divided into more region, increases regulating effect further, display panel is made to reach better display effect.
Below by show the flicker value of homogeneity parameter as display, the correction method of the display panel that the embodiment of the present invention provides is described.
Its specific implementation flow process as shown in Figure 6, specifically comprises following step:
S201, determine display panel when the flicker value showing center position is minimum the first common electric voltage value V of loading1;
It is divided into 9 regions for display panel, performs respectively for each region after display panel divides:
The 2nd common electric voltage value V that the flicker value of S202, determine each region heart position in the zone loads time minimum21��V22��V23��V24��V25��V26��V27��V28��V29;
S203, using the offset voltage value of the difference of the first common electric voltage value and the 2nd common electric voltage value as each region, the offset voltage value in each region is �� V1����V2����V3����V4����V5����V6����V7����V8����V9;
S204, regulate the data voltage in each region according to offset voltage value;
S205, when determining that each region regulates the flicker value after data voltage can not reach setting threshold value, re-execute step S201 until the display homogeneity parameter in each region after regulating reaches setting threshold value.
When producing in a large number, it is possible to add up the offset voltage value in each region corresponding to multiple display panel, get the mean value of the offset voltage value in each region or integrated value (such as variance value, rootmean-square etc.) as offset voltage value during a large amount of production. Being divided into 5 regions for two display panels, the offset voltage value in each region of panel one is respectively A1��A2��A3��A4��A5, the offset voltage value in each region of panel two is respectively B1��B2��B3��B4��B5, then (A can be got1+B1)/2��(A2+B2)/2��(A3+B3)/2��(A4+B4)/2��(A5+B5)/2 are as the offset voltage value in each region during a large amount of production.
Conceive based on same invention, the embodiment of the present invention additionally provides the correction device of a kind of display panel, the principle dealt with problems due to this device is similar to the correction device method of aforementioned a kind of display panel, and therefore the enforcement of this device see the enforcement of method, can repeat part and repeat no more.
The correction device of a kind of display panel that the embodiment of the present invention provides, as shown in Figure 7, comprising:
First determining unit 301, for determining the first common electric voltage value that display panel loads when showing homogeneity parameter and reach optimum regime;
2nd determining unit, for for each region after display panel division, it is determined that the 2nd common electric voltage value that each region loads when showing homogeneity parameter and reach optimum regime;
3rd determining unit 303, for for each region, determining the offset voltage value in each region according to the first common electric voltage value and the 2nd common electric voltage value;
Regulate unit 304, for for each region, regulating the data voltage in each region according to offset voltage value.
Specifically, in said apparatus, display homogeneity parameter is the flicker value of display;
First determining unit 301, specifically for determining the first common electric voltage value that display panel loads when the flicker value showing center position is minimum;
2nd determining unit 302, the 2nd common electric voltage value loaded time minimum specifically for determining the flicker value of heart position in this region, each region.
Specifically, in said apparatus, display homogeneity parameter is the inclined value of green of display;
First determining unit 301, specifically for determining the first common electric voltage value that display panel loads when the inclined value of green showing center position is minimum;
2nd determining unit 302, the 2nd common electric voltage value loaded time minimum specifically for determining the inclined value of green of heart position in this region, each region.
Specifically, in said apparatus, the 3rd determining unit 303, specifically for using the offset voltage value of the difference of the first common electric voltage value and the 2nd common electric voltage value as each region.
Specifically, in said apparatus, value regulates unit 304, the data voltage loaded during specifically for the data voltage sum of offset voltage value and this region being shown as this region.
Specifically, in said apparatus, this device also comprises:
Amending unit, when can not reach setting threshold value for the display homogeneity parameter after determining each region adjustment data voltage, redefine the first common electric voltage value, the 2nd common electric voltage value and offset voltage value, and regulate the data voltage in each region according to the offset voltage value redefined until the display homogeneity parameter in each region after regulating reaches setting threshold value.
The correction method of a kind of display panel that the embodiment of the present invention provides and device, by respectively the data voltage in each region being regulated, after making data voltage be coupled on common electric voltage, the common electric voltage of same panel different zones is roughly the same, thus alleviate that the color that display panel produces is partially green, flicker homogeneity difference and residual picture the problem such as increase the weight of.
Obviously, the present invention can be carried out various change and modification and not depart from the spirit and scope of the present invention by the technician of this area. Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these change and modification.
Claims (12)
1. the correction method of a display panel, it is characterised in that, comprising:
Determine the first common electric voltage value that display panel loads when showing homogeneity parameter and reach optimum regime;
Perform respectively for each region after display panel divides:
Determine the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime;
The offset voltage value in described region is determined according to described first common electric voltage value and described 2nd common electric voltage value;
The data voltage in described region is regulated according to described offset voltage value.
2. the method for claim 1, it is characterised in that, described display homogeneity parameter is the flicker value of display;
Described determine display panel first common electric voltage value of loading when showing homogeneity parameter and reach optimum regime, specifically comprise: determine the first common electric voltage value that display panel loads when the flicker value showing center position is minimum;
Described determine the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime, specifically comprise: determine the 2nd common electric voltage value that the flicker value of heart position in this region, each described region loads time minimum.
3. the method for claim 1, it is characterised in that, described display homogeneity parameter is the inclined value of green of display;
Described determine display panel first common electric voltage value of loading when showing homogeneity parameter and reach optimum regime, specifically comprise: determine the first common electric voltage value that display panel loads when the inclined value of green showing center position is minimum;
Described determine the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime, specifically comprise: determine the 2nd common electric voltage value that the inclined value of green of heart position in this region, each described region loads time minimum.
4. the method for claim 1, it is characterised in that, the described offset voltage value determining described region according to described first common electric voltage value and described 2nd common electric voltage value, specifically comprises:
Using the offset voltage value of the difference of described first common electric voltage value and described 2nd common electric voltage value as described region.
5. the method for claim 1, it is characterised in that, the described data voltage regulating described region according to described offset voltage value, specifically comprises:
The data voltage loaded when the data voltage sum of described offset voltage value and described region is shown as described region.
6. method as described in item as arbitrary in claim 1-5, it is characterised in that, described regulate the data voltage in described region according to described offset voltage value after, also comprise:
When described display homogeneity parameter after determining described region adjustment data voltage can not reach setting threshold value, redefine described first common electric voltage value, described 2nd common electric voltage value and described offset voltage value, and regulate the data voltage in described region according to the offset voltage value redefined until the described display homogeneity parameter in described region after regulating reaches described setting threshold value.
7. the correction device of a display panel, it is characterised in that, comprising:
First determining unit, for determining the first common electric voltage value that display panel loads when showing homogeneity parameter and reach optimum regime;
2nd determining unit, for for each region after display panel division, it is determined that the 2nd common electric voltage value that each described region loads when described display homogeneity parameter reaches optimum regime;
3rd determining unit, for for each region, determining the offset voltage value in described region according to described first common electric voltage value and described 2nd common electric voltage value;
Regulate unit, for for each region, regulating the data voltage in described region according to described offset voltage value.
8. device as claimed in claim 7, it is characterised in that, described display homogeneity parameter is the flicker value of display;
Described first determining unit, specifically for determining the first common electric voltage value that display panel loads when the flicker value showing center position is minimum;
Described 2nd determining unit, the 2nd common electric voltage value loaded time minimum specifically for determining the flicker value of heart position in this region, each described region.
9. device as claimed in claim 7, it is characterised in that, described display homogeneity parameter is the inclined value of green of display;
Described first determining unit, specifically for determining the first common electric voltage value that display panel loads when the inclined value of green showing center position is minimum;
Described 2nd determining unit, the 2nd common electric voltage value loaded time minimum specifically for determining the inclined value of green of heart position in this region, each described region.
10. device as claimed in claim 7, it is characterised in that, described 3rd determining unit, specifically for using the offset voltage value of the difference of described first common electric voltage value and described 2nd common electric voltage value as described region.
11. devices as claimed in claim 7, it is characterised in that, described value regulates unit, the data voltage loaded during specifically for the data voltage sum of described offset voltage value and described region being shown as described region.
Device as described in 12. items as arbitrary in claim 7-11, it is characterised in that, described device also comprises:
Amending unit, when can not reach setting threshold value for the described display homogeneity parameter after determining described region adjustment data voltage, redefine described first common electric voltage value, described 2nd common electric voltage value and described offset voltage value, and regulate the data voltage in described region according to the offset voltage value redefined until the described display homogeneity parameter in described region after regulating reaches described setting threshold value.
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