CN117275386A - Display panel, gamma data determining method thereof and driving method thereof - Google Patents
Display panel, gamma data determining method thereof and driving method thereof Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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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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- 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
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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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
- G09G2320/0271—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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- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The embodiment of the invention discloses a display panel and a gamma data determining method and a driving method thereof, wherein gamma data of intermediate display brightness levels corresponding to target gray levels are determined according to target gray levels and target gamma data groups, which is equivalent to inserting virtual intermediate display brightness level binding points between two adjacent display brightness level binding points in the prior art, gamma debugging is not needed under the virtual intermediate display brightness level binding points, gamma data meeting the requirements on brightness and color coordinates can be obtained, compared with gamma data with fewer display brightness level binding points in the prior art, gamma data corresponding to intermediate display brightness levels is obtained based on interpolation of the display brightness level binding points, color cast can be improved, picture display quality is improved, the number of actual display brightness level binding points is not needed to be increased, and higher gamma debugging efficiency can be ensured.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a gamma data determining method and a driving method thereof.
Background
With the development of display technology, the requirements of users on the display quality of pictures are also increasing.
In the prior art, the display of the display panel can be divided into a plurality of display brightness levels, and when gamma debugging is performed, a plurality of display brightness levels are generally selected as binding points for gamma debugging.
However, the prior art has a problem that color shift of a display surface is serious under a display brightness level between adjacent display brightness level binding points.
Disclosure of Invention
The invention provides a display panel, a gamma data determining method and a driving method thereof, which are used for reducing the color cast degree of a display picture under the display brightness level between adjacent display brightness level binding points and improving the display quality of the picture.
In a first aspect, an embodiment of the present invention provides a gamma data determining method of a display panel, including:
acquiring a target gamma data set corresponding to a second display brightness level binding point in adjacent first display brightness level binding points and second display brightness level binding points; wherein, the brightness corresponding to the binding point of the second display brightness level is larger than the brightness corresponding to the binding point of the first display brightness level; the target gamma data set comprises a plurality of gray scales and gamma data corresponding to the gray scales;
Determining at least one target gray level and at least one intermediate display brightness level under the second display brightness level binding point, wherein the target gray level corresponds to the intermediate display brightness level one by one, and the brightness of the target gray level is matched with the brightness corresponding to the corresponding intermediate display brightness level; the middle display brightness level is between the first display brightness level binding point and the second display brightness level binding point;
determining gamma data corresponding to at least one intermediate display brightness level corresponding to the target gray scale according to the at least one target gray scale and the target gamma data set; the gamma data includes a gamma register value or a data voltage.
Optionally, the target gamma data set includes a plurality of binding point gray scales and gamma data corresponding to the binding point gray scales;
determining at least one target gray level and at least one intermediate display brightness level at the second display brightness level binding point comprises:
determining at least one binding point gray level corresponding to the brightness between the first brightness and the second brightness as a target gray level; the first brightness is the brightness corresponding to the first display brightness level, and the second brightness is the brightness corresponding to the second display brightness level;
according to the first corresponding relation between the display brightness level and the brightness in the target display brightness level interval, determining the display brightness level matched with the brightness corresponding to the target gray level as an intermediate display brightness level; the target display brightness level interval is an interval taking the first display brightness level binding point and the second display brightness level binding point as interval endpoints;
Optionally, according to the corresponding relation between the display brightness level and the brightness in the target display brightness level interval, determining the display brightness level of which the brightness difference corresponding to the target gray level is in the set range as the middle display brightness level;
optionally, according to the corresponding relation between the display brightness level and the brightness in the target display brightness level interval, the display brightness level determined to be equal to the brightness corresponding to the target gray level is determined as the intermediate display brightness level.
Optionally, determining, according to the first correspondence between the display luminance level and the luminance in the target display luminance level interval, the display luminance level matching the luminance corresponding to the target gray level as the intermediate display luminance level includes:
determining the brightness corresponding to the target gray scale according to the brightness corresponding to the second display brightness level binding point and the second corresponding relation between the gray scale of the second display brightness level binding point and the brightness;
and determining the intermediate display brightness level matched with the target gray level according to the brightness corresponding to the target gray level and the first corresponding relation.
Optionally, before acquiring the target gamma data set corresponding to the second display brightness level binding point in the adjacent first display brightness level binding point and second display brightness level binding point, the method includes:
Gamma debugging is carried out on the gray scales of the binding points under each display brightness level binding point, and gamma data meeting the target brightness and the target chromaticity corresponding to the gray scales of the binding points are determined to be gamma data corresponding to the gray scales of the binding points, so that a gamma data set corresponding to each display brightness level is obtained.
Optionally, determining gamma data corresponding to at least one intermediate display brightness level corresponding to the target gray scale according to the at least one target gray scale and the target gamma data set includes:
and determining the gamma data corresponding to the target gray scale as the gamma data corresponding to the intermediate display brightness level corresponding to the target gray scale.
Optionally, after determining the gamma data corresponding to the at least one intermediate display brightness level corresponding to the target gray level according to the at least one target gray level and the target gamma data set, the method further includes:
according to gamma data corresponding to two adjacent display brightness level binding points, interpolating and calculating gamma data corresponding to other display brightness levels between the two adjacent display brightness level binding points;
the display brightness level binding points comprise real binding points and virtual binding points, wherein the real binding points comprise first display brightness level binding points and second display brightness level binding points, and the virtual binding points comprise intermediate display brightness levels.
Optionally, determining gamma data corresponding to at least one intermediate display brightness level corresponding to the target gray scale according to the at least one target gray scale and the target gamma data set includes:
determining gamma data corresponding to the maximum gray level under the middle display brightness level corresponding to the target gray level according to the target gray level and the target gamma data group;
after determining gamma data corresponding to the maximum gray level at the intermediate display brightness level corresponding to the target gray level according to the at least one target gray level and the target gamma data set, the method further comprises:
according to the brightness corresponding to the middle display brightness level, determining the brightness corresponding to other gray scales except the maximum gray scale of the middle display brightness level;
determining the gray scales corresponding to the other gray scales under the second display brightness level binding point according to the brightness corresponding to the other gray scales;
and assigning the gamma data of the gray scale under the second display brightness level binding point to other gray scales under the intermediate display brightness level corresponding to the gray scale under the second display brightness level binding point.
Optionally, after determining the gamma data corresponding to the at least one intermediate display brightness level corresponding to the target gray level according to the at least one target gray level and the target gamma data set, the method further includes:
The gamma data is stored.
In a second aspect, an embodiment of the present invention further provides a display panel, where gamma data is determined by using the gamma data determining method of the display panel of the first aspect;
optionally, in the target display brightness level interval taking the first display brightness level binding point and the second display brightness level binding point as interval endpoints, other driving data except gamma data under each display brightness level are the same;
optionally, the display panel includes a plurality of pixel circuits, the pixel circuits include a data writing module, a driving module and a light emitting module, the data writing module is used for writing corresponding data voltages to a control end of the driving module, the driving module and the light emitting module are connected between a first power line and a second power line, and other driving data include a first power voltage on the first power line and a second power voltage on the second power line;
optionally, the pixel circuit further includes a first initialization module, where the first initialization module is configured to write a first initialization voltage to a control end of the driving module, and the other driving data further includes the first initialization voltage;
optionally, the pixel circuit further includes a second initialization module, where the second initialization module is configured to write a second initialization voltage to the light emitting module, and the other driving data further includes the second initialization voltage;
Optionally, the pixel circuit further includes a light-emitting control module, the driving module, and the light-emitting module are connected in series between the first power line and the second power line, the light-emitting control module is configured to control a conduction state between the first power line and the second power line according to a light-emitting control signal, and other driving data further includes a duty ratio of the light-emitting control signal;
optionally, the display panel further includes a gate driving circuit, and the driving data further includes a clock signal, a power signal and a start signal connected to the gate driving circuit.
In a third aspect, an embodiment of the present invention further provides a driving method of a display panel, including:
driving the display panel according to the target display brightness level and gamma data corresponding to the target display brightness level; wherein the gamma data is determined using the gamma data determining method of the display panel of the first aspect.
According to the display panel, the gamma data determining method and the driving method thereof, at least one target gray scale under the second display brightness level binding point and an intermediate display brightness level matched with the target gray scale brightness are determined by acquiring the target gamma data set corresponding to the second display brightness level binding point in the adjacent first display brightness level binding point and second display brightness level binding point; and determining gamma data corresponding to at least one intermediate display brightness level according to the at least one target gray scale and the target gamma data group. According to the technical scheme, the gamma data of the middle display brightness level corresponding to the target gray level is determined according to the target gray level and the target gamma data group, which is equivalent to inserting a virtual middle display brightness level binding point between two adjacent display brightness level binding points in the prior art, gamma debugging is not needed under the virtual middle display brightness level binding point, gamma data meeting the requirements on brightness and color coordinates can be obtained, compared with the gamma data with fewer display brightness level binding points in the prior art, gamma data corresponding to the middle display brightness level is obtained based on interpolation of the display brightness level binding points, color cast can be improved, picture display quality is improved, the number of actual display brightness level binding points is not needed to be increased, and higher gamma debugging efficiency can be ensured.
Drawings
FIG. 1 is a graph of corresponding color coordinates when gamma data of a display brightness level between DBV1 and DBV284 is interpolated for two display brightness level binding points based on DBV1 and DBV 284;
FIG. 2 is a flow chart of a gamma data determining method of a display panel according to an embodiment of the present invention;
FIG. 3 is a flowchart of another gamma data determining method of a display panel according to an embodiment of the present invention;
FIG. 4 is a graph showing gamma curves under the brightness level binding point DBV 284;
FIG. 5 is a section where DBV284 and DBV1 are section endpoints;
fig. 6 is a graph showing a relationship between a display brightness level and a color coordinate between a DBV1 and a DBV284 in case that gamma data is obtained by using the gamma data determining method of the display panel according to an embodiment of the present invention to drive the display panel;
fig. 7 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As described in the background art, the prior art has a problem that color shift is obvious at the display brightness level between adjacent display brightness level binding points. The inventor researches that the reason for the problem is that in the prior art, when gamma debugging is performed, a plurality of display brightness levels are generally selected as binding points for gamma debugging, and gamma data corresponding to other display brightness levels are generally obtained by interpolation calculation according to gamma data corresponding to binding points of the display brightness levels, for example, by linear interpolation calculation. Because of certain requirements on gamma debugging efficiency, the number of selected display brightness level binding points is small, and the characteristics of different display panels are different, gamma data obtained through interpolation calculation cannot be completely matched with the characteristics of the panels, so that color cast is serious under the display brightness level between adjacent display brightness level binding points. Fig. 1 is a graph of color coordinates corresponding to interpolation of gamma data of a display brightness level between the DBV1 and the DBV284 for two display brightness level binding points based on the DBV1 and the DBV 284. Wherein the abscissa in fig. 1 represents the display brightness level, and the ordinate represents the ordinate CIE-y of the color coordinates. As can be seen from fig. 1, when gamma data corresponding to the display brightness level between the display brightness level binding points is obtained by interpolation of the two display brightness level binding points, the y coordinate in the color coordinates is significantly shifted, and the color shift is serious during the picture display.
In view of the above, an embodiment of the present invention provides a flowchart of a gamma data determining method of a display panel, referring to fig. 1, the gamma data determining method of the display panel includes:
step 110, acquiring a target gamma data set corresponding to a second display brightness level binding point in the adjacent first display brightness level binding point and second display brightness level binding point.
Specifically, display devices such as mobile phones and computers generally include a brightness adjustment key, through which a user adjusts the overall display brightness of the display device, and each time the user presses the brightness adjustment key, the brightness adjustment key can correspond to an input display brightness level. Each display brightness level can correspond to one display brightness of the maximum gray level in the display panel, and after the display brightness corresponding to the maximum gray level in the display panel is changed, the display brightness corresponding to other gray levels is also changed. Specifically, when the display brightness corresponding to the maximum gray scale in the display panel increases, the display brightness corresponding to other gray scales also increases; when the display luminance corresponding to the maximum gray scale in the display panel decreases, the display luminance corresponding to the other gray scales also decreases.
And during gamma debugging, selecting a plurality of display brightness level binding points, and performing gamma debugging under different display brightness level binding points. Illustratively, the number of selected display brightness level binding points is n, optionally n is an integer greater than or equal to 8 and less than or equal to 12. The selected display brightness level binding points are DBV1 and DBV2 … … DBVn according to the corresponding brightness sequence from small to large, wherein DBVi and DBV (i+1) are two adjacent display brightness level binding points, and n is a positive integer greater than or equal to 1 and less than or equal to n-1. And for any two adjacent display brightness level binding points, wherein the display brightness level binding point corresponding to the lower brightness is a first display brightness level binding point, and the display brightness level binding point corresponding to the higher brightness is a second display brightness level binding point, namely the brightness corresponding to the second display brightness level binding point is greater than the brightness corresponding to the first display brightness level binding point. Illustratively, among the DBVi and DBV (i+1), DBVi is a first display brightness level binding point and DBV (i+1) is a second display brightness level binding point. And the brightness corresponding to the display brightness level corresponds to the brightness corresponding to the maximum gray level under the display brightness level. Correspondingly, the brightness corresponding to the display brightness level binding point is the brightness corresponding to the maximum gray level under the display brightness level binding point.
And gamma debugging is carried out under each display brightness level binding point, wherein when gamma debugging is carried out, a plurality of binding point gray scales can be selected, gamma data corresponding to each binding point gray scale is obtained through debugging, and further a gamma data set corresponding to each display brightness level binding point can be obtained, and the gamma data set comprises a plurality of gray scales and gamma data corresponding to the gray scales. In this step, for any two adjacent binding points of display brightness levels, a gamma data set corresponding to the second display brightness level is obtained as a target gamma data set.
Step 120, determining at least one target gray scale and at least one intermediate display brightness level under the second display brightness level binding point, wherein the target gray scale corresponds to the intermediate display brightness level one by one, and the brightness of the target gray scale matches with the brightness corresponding to the corresponding intermediate display brightness level; the intermediate display brightness level is between the first display brightness level binding point and the second display brightness level binding point.
Because a plurality of binding point gray scales are selected for gamma debugging under each display brightness level binding point. In a display brightness level interval taking a first display brightness level binding point and a second display brightness level binding point as interval endpoints, the brightness corresponding to the second display brightness level binding point is the largest, namely the brightness corresponding to the largest gray scale under the second display brightness level binding point is the largest in the display brightness level interval. Therefore, at least one target gray level may be selected under the second display brightness level, where the brightness corresponding to the target gray level matches the brightness corresponding to the middle display brightness level whose brightness is lower than the binding point of the second display brightness level, where in some alternative embodiments of the present invention, the brightness matching between the brightness corresponding to the target gray level and the brightness corresponding to the middle display brightness level may refer to the difference between the brightness corresponding to the target gray level and the brightness corresponding to the middle display brightness level being smaller than a set threshold, where the difference between the brightness may be a difference between the brightness, a ratio, or a value obtained based on other preset algorithms, and embodiments of the present invention are not limited herein specifically.
Step 130, determining at least one gamma data corresponding to the intermediate display brightness level corresponding to the target gray level according to the at least one target gray level and the target gamma data set; the gamma data includes a gamma register value or a data voltage.
Specifically, after the target gray level is determined, gamma data corresponding to the target gray level can be determined according to the target gray level and the target gamma data set, and gamma data corresponding to the intermediate display brightness level corresponding to the target gray level is determined according to gamma data corresponding to the target gray level. The gamma data may include a gamma register value, which is an internal register value of a driving chip of the display panel, or a data voltage, which is a data voltage supplied to a pixel circuit in the display panel.
As described above, during gamma debugging, a plurality of binding point gray scales are set under each binding point of display brightness level to carry out gamma debugging, and the brightness and color coordinate requirements corresponding to the binding point gray scales need to be met during gamma debugging, so that the gamma data corresponding to the binding point gray scales determined under each binding point of display brightness level can ensure the display effect corresponding to the binding point gray scales. And because the number of the gray scales of the binding points is relatively large, the gamma data under other gray scales obtained by calculation according to the gamma data corresponding to the gray scales of the binding points can also meet the corresponding brightness and color coordinate requirements. Therefore, in this embodiment, the gamma data of the intermediate display brightness level corresponding to the target gray level determined according to the target gray level and the target gamma data set is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art, and gamma debugging is not required to be performed at the virtual intermediate display brightness level binding point, so that gamma data meeting the requirements on brightness and color coordinates can be obtained.
Optionally, after the step 130, the method further includes: the gamma data is stored. After the gamma data is stored, when the display panel is driven, the gamma data corresponding to the display brightness level of the display picture can be directly used.
According to the gamma data determining method of the display panel, at least one target gray scale under the second display brightness level binding point and an intermediate display brightness level matched with the target gray scale brightness are determined by acquiring a target gamma data set corresponding to the second display brightness level binding point in the adjacent first display brightness level binding point and second display brightness level binding point; and determining gamma data corresponding to at least one intermediate display brightness level according to the at least one target gray scale and the target gamma data group. According to the technical scheme, gamma data of the middle display brightness level corresponding to the target gray level is determined according to the target gray level and the target gamma data group, which is equivalent to inserting a virtual middle display brightness level binding point between two adjacent display brightness level binding points in the prior art, gamma debugging is not needed under the virtual middle display brightness level binding point, gamma data meeting the requirements on brightness and color coordinates can be obtained, compared with the gamma data with fewer display brightness level binding points in the prior art, gamma data corresponding to the middle display brightness level is obtained based on interpolation of the display brightness level binding points, color cast can be improved, picture display quality is improved, the number of actual display brightness level binding points is not needed to be increased, and higher gamma debugging efficiency can be ensured.
On the basis of the above technical solution, optionally, the target gamma data set includes a plurality of binding point gray levels and gamma data corresponding to the binding point gray levels.
Fig. 3 is a flowchart of another gamma data determining method of a display panel according to an embodiment of the present invention, and referring to fig. 3, optionally, the gamma data determining method of the display panel includes:
step 210, gamma debugging is performed on the plurality of binding point gray levels under each display brightness level binding point, and gamma data meeting the target brightness and the target chromaticity corresponding to the binding point gray levels is determined as gamma data corresponding to the binding point gray levels, so as to obtain a gamma data set corresponding to each display brightness level.
The gamma data set corresponding to the display brightness level comprises a plurality of binding point gray scales and gamma data corresponding to the binding point gray scales, and the gamma data corresponding to the gray scales except the binding point gray scales can be obtained by interpolation calculation according to the gamma data corresponding to the binding point gray scales. When gamma debugging is carried out on the gray scale of the binding point, a display panel can be driven to display a picture corresponding to the gray scale of the binding point, and then the brightness and the color coordinates of the display picture are adjusted by adjusting gamma data, so that the gamma data when the target brightness and the target color coordinates corresponding to the gray scale of the binding point are the gamma data corresponding to the gray scale of the binding point. The display panel can comprise sub-pixels with various luminous colors, and the sub-pixels with different luminous colors can be respectively subjected to gamma debugging to obtain gamma data corresponding to gray scales of corresponding binding points. For example, when the display panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, a gamma data set corresponding to the red sub-pixel at each display brightness level, a gamma data set corresponding to the green sub-pixel at each display brightness level, and a gamma data set corresponding to the blue sub-pixel at each display brightness level may be obtained respectively. In the subsequent step, when the gamma data corresponding to the intermediate display brightness level is performed, the gamma data corresponding to the sub-pixels with different colors under the intermediate display brightness level can be determined respectively based on the sub-pixels with different colors.
220, acquiring a target gamma data set corresponding to a second display brightness level binding point in adjacent first display brightness level binding points and second display brightness level binding points; this step is the same as the step 110 in the above embodiment, and will not be described here again.
Step 230, determining at least one binding point gray level corresponding to the brightness between the first brightness and the second brightness as a target gray level; the first brightness is the brightness corresponding to the first display brightness level, and the second brightness is the brightness corresponding to the second display brightness level.
As described above, under each binding point of the display brightness level, a plurality of binding point gray levels are set to perform gamma debugging, and when gamma debugging is performed, the brightness and color coordinate requirements corresponding to the binding point gray levels need to be met.
Step 240, determining the display brightness level matched with the brightness corresponding to the target gray level as the middle display brightness level according to the first corresponding relation between the display brightness level and the brightness in the target display brightness level interval; the target display brightness level interval is an interval taking the first display brightness level binding point and the second display brightness level binding point as interval endpoints.
In some optional embodiments of the present invention, the display luminance level for which the luminance difference corresponding to the target gray level is determined to be within the set range may be determined as the intermediate display luminance level according to the correspondence between the display luminance level and the luminance in the target display luminance level section. In another alternative embodiment of the present invention, the display luminance level determined to be equal to the luminance corresponding to the target gray scale may be determined as the intermediate display luminance level according to the correspondence between the display luminance level and the luminance in the target display luminance level section.
Optionally, the step 240 may include:
determining the brightness corresponding to the target gray scale according to the brightness corresponding to the second display brightness level binding point and the second corresponding relation between the gray scale and the brightness under the second display brightness level binding point; and determining the intermediate display brightness level matched with the target gray level according to the brightness corresponding to the target gray level and the first corresponding relation.
As described above, the brightness corresponding to the second display brightness level binding point is the brightness corresponding to the maximum gray level at the second display brightness level binding point. And under the second display brightness level binding point, the brightness corresponding to other gray scales except the maximum gray scale can be obtained according to a preset algorithm and the brightness corresponding to the maximum gray scale. The preset algorithm is obtained according to a gamma curve satisfied by the display panel, and fig. 4 is a gamma curve under the display brightness level binding point DBV284, where the abscissa is Gray, and the ordinate is brightness Lv, and the unit is nit. The maximum gray level 255 at the DBV284 corresponds to a luminance of 7nit. For example, when a standard gamma curve is satisfied, in which the index parameter value at the time of calculating the corresponding luminance according to the gray scale is 2.2, the luminance corresponding to the target gray scale may be calculated according to the following formula, Wherein Lv i Representing the brightness, lv, corresponding to the target gray scale DBV And representing the brightness corresponding to the binding point of the display brightness level (namely, the brightness corresponding to the maximum gray level under the display brightness level), grayi represents the target gray level, and Graymax represents the maximum gray level. For example, there are three target gray levels, namely, the binding point gray levels 232, 207 and 175, respectively, wherein the brightness corresponding to the 232 gray levels is (7×239/255)/(2.2) =6.07 nit, and the brightness corresponding to the 207 gray levels and 175 gray levels is 4.424nit and 3.058nit, respectively.
Fig. 5 is a graph showing luminance levels versus luminance in a section where DBV284 and DBV1 are end points of the section, wherein the luminance corresponding to the maximum gray level 255 under DBV1 is 2nit, wherein the abscissa represents the display luminance level DBV, the ordinate represents the luminance Lv, and the unit is nit. The situation shown in fig. 5 is illustrated by way of example in which the brightness varies linearly with the display brightness level. After the brightness corresponding to the target gray level is determined, the brightness corresponding to the target gray level can be substituted into the first corresponding relation between the display brightness level and the brightnessThe display luminance level equal to the luminance corresponding to the target gradation is determined as the intermediate display luminance level. Wherein, the adjacent display brightness level binding points of the DBV284 and the DBV1 are two display brightness level binding points, in which, DBV1 is a first display brightness level binding point, DBV284 is a second display brightness level binding point, taking the case that brightness changes linearly with the display brightness level as shown in FIG. 5 as an example, brightness under the middle display brightness level DBV232 is Equal to the luminance of the 232 gray scale at the DBV284, the intermediate display luminance level corresponding to the 232 gray scale at the DBV284 is the DBV232. Accordingly, the intermediate display luminance level corresponding to the 207 gradation under the DBV284 is DBV138, and the intermediate display luminance level corresponding to the 175 gradation under the DBV284 is DBV61.
Step 250, determining the gamma data corresponding to the target gray scale as the gamma data corresponding to the intermediate display brightness level corresponding to the target gray scale.
When gamma debugging is performed, a plurality of binding point gray scales are set under each display brightness level binding point, and the brightness and color coordinate requirements corresponding to the binding point gray scales are required to be met when gamma debugging is performed, so that the gamma data corresponding to the binding point gray scales determined under each display brightness level binding point can ensure the display effect corresponding to the binding point gray scales. And because the number of the gray scales of the binding points is relatively large, the gamma data under other gray scales obtained by calculation according to the gamma data corresponding to the gray scales of the binding points can also meet the corresponding brightness and color coordinate requirements. Therefore, in this embodiment, the gamma data corresponding to the target gray level is determined as the gamma data corresponding to the intermediate display brightness level corresponding to the target gray level, which is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art, and gamma data meeting the requirements on brightness and color coordinates can be obtained without gamma debugging under the virtual intermediate display brightness level binding point. And the gamma data corresponding to the target gray level is directly determined as the gamma data corresponding to the intermediate display brightness level corresponding to the target gray level, so that the gamma data corresponding to the intermediate display brightness level can be obtained without other operations, and the efficiency of the gamma data determination method is improved. In addition, because gamma debugging is performed under the gray scale of the binding point, when the target gray scale is equal to the gray scale of the binding point, the step of interpolating gamma data corresponding to the target gray scale is reduced when other gray scales except the gray scale of the binding point are determined as the target gray scale, so that the color shift of the display image under the gamma data corresponding to the intermediate display brightness level is smaller, and the brightness is more matched.
Fig. 6 is a graph showing a relationship between a display brightness level and a color coordinate between the DBV1 and the DBV284 in a case where the display panel is driven by gamma data obtained by the gamma data determining method of the display panel according to an embodiment of the present invention. The brightness corresponding to the DBV1 is equal to the brightness corresponding to the 145 gray scale at the DBV 284. A plurality of intermediate display brightness levels are randomly determined between DBV1 and DBV284, three intermediate display brightness levels, DBVa, DBVb and DBV232, are schematically shown in fig. 6, where a < b <232. According to the gamma data determining method of the above embodiment of the present invention, it can be found that the gray level corresponding to the DBV232 under the DBV284 is 239 (i.e. 239gray in fig. 6), the gray level corresponding to the DBVb under the DBV284 is q gray level (i.e. gray q in fig. 6), and the gray level corresponding to the DBVa under the DBV284 is p gray level (i.e. gray p in fig. 6), where p < q <239. Referring to fig. 6, in the case where the gamma data is obtained by using the gamma data determining method of the display panel according to the embodiment of the present invention to drive the display panel, the color coordinate shift at the intermediate display brightness level corresponding to the target gray levels (239, grayp and grayq) at the second display brightness level bonding point DBV284 is pulled back to normal, so that the color shift can be improved and the color shift at each intermediate display brightness level between the DBV1 and the DBV284 is smaller.
On the basis of the above embodiment, optionally, after the above step 130 and step 250, the method further includes: according to gamma data corresponding to two adjacent display brightness level binding points, interpolating and calculating gamma data corresponding to other display brightness levels between the two adjacent display brightness level binding points; the display brightness level binding points comprise real binding points and virtual binding points, wherein the real binding points comprise first display brightness level binding points and second display brightness level binding points, and the virtual binding points comprise intermediate display brightness levels. Specifically, the intermediate display brightness level included in the virtual binding point is the intermediate display brightness level that matches the target gray scale brightness determined in the above embodiment.
In this embodiment, since the gamma data corresponding to the virtual binding point (i.e., the middle display brightness level corresponding to the target gray level) can improve color shift compared with the prior art, when the gamma data corresponding to other display brightness levels between two adjacent display brightness level binding points is calculated according to the adjacent display brightness level binding point difference value including the real binding point and the virtual binding point, the color shift of the display screen under other display brightness levels can also be improved.
Based on the above embodiment, optionally, the step 130 may include: and determining gamma data corresponding to the maximum gray level under the intermediate display brightness level corresponding to the target gray level according to the at least one target gray level and the target gamma data set. For example, the target gray scale and the target gamma data set can be used for determining gamma data corresponding to the target gray scale; and then determining the gamma data corresponding to the target gray scale as the gamma data corresponding to the maximum gray scale under the intermediate display brightness level.
Optionally, after determining the gamma data corresponding to the maximum gray level at the intermediate display brightness level corresponding to the target gray level according to the at least one target gray level and the target gamma data set, the method further includes:
according to the brightness corresponding to the middle display brightness level, determining the brightness corresponding to other gray scales except the maximum gray scale of the middle display brightness level; determining the gray scales corresponding to the other gray scales under the second display brightness level binding point according to the brightness corresponding to the other gray scales; and assigning the gamma data of the gray scale under the second display brightness level binding point to other gray scales under the intermediate display brightness level corresponding to the gray scale under the second display brightness level binding point.
Specifically, according to the brightness corresponding to the middle display brightness level, the brightness corresponding to other gray scales except the maximum gray scale of the middle display brightness level is determined, that is, according to the brightness corresponding to the maximum gray scale of the middle display brightness level, the brightness corresponding to other gray scales of the middle display brightness level is determined, and specifically, the brightness corresponding to the gamma curve satisfied by the display panel can be determined. After determining the brightness corresponding to other gray scales under the middle display brightness level, the gray scales with brightness equal to the brightness corresponding to other gray scales under the middle display brightness level can be found under the second display brightness level binding point according to the brightness corresponding to other gray scales under the middle display brightness level, gamma data corresponding to the gray scales with brightness equal to the brightness corresponding to other gray scales under the middle display brightness level under the second display brightness level binding point are assigned to other gray scales under the middle display brightness level corresponding to the gray scales under the second display brightness level binding point, and further the color cast degree under the other gray scales under the middle display brightness level is improved.
On the basis of the above embodiments, optionally, in the target display brightness level section using the first display brightness level binding point and the second display brightness level binding point as section end points, other driving data except gamma data under each display brightness level are the same, so that influence of other driving data except gamma data is eliminated, and it is ensured that when at least one gamma data corresponding to the middle display brightness level corresponding to the target gray level is determined according to at least one target gray level and the target gamma data set, the display effect of the display panel is improved.
The embodiment of the invention also provides a display panel, which adopts the gamma data determining method of the display panel of any embodiment of the invention to determine gamma data.
Optionally, the display panel includes a plurality of pixel circuits, fig. 7 is a schematic structural diagram of a pixel circuit provided in an embodiment of the present invention, referring to fig. 7, optionally, the pixel circuit includes a Data writing module 310, a driving module 320 and a light emitting module 330, the Data writing module 310 is configured to write a corresponding Data voltage Data to a control terminal of the driving module 320, the driving module 320 and the light emitting module 330 are connected between a first power line VDD and a second power line VSS, and other driving Data includes a first power voltage on the first power line VDD and a second power voltage on the second power line VSS.
Optionally, the pixel circuit further includes a first initialization module 340, where the first initialization module 340 is configured to write a first initialization voltage Vref1 to the control terminal of the driving module 320, and the other driving data further includes the first initialization voltage Vref1.
Optionally, the pixel circuit further includes a second initialization module 350, the second initialization module 350 is configured to write a second initialization voltage Vref2 to the light emitting module 330, and the other driving data further includes the second initialization voltage Vref2.
Optionally, the pixel circuit further includes a light emitting control module 360, the light emitting control module 360 is connected in series with the driving module 320 and the light emitting module 330 between the first power line VDD and the second power line VSS, the light emitting control module 360 is configured to control a conductive state between the first power line VDD and the second power line VSS according to the light emitting control signal EM, and other driving data further includes a duty ratio of the light emitting control signal EM.
Optionally, the display panel further includes a gate driving circuit, and the driving data further includes a clock signal, a power signal and a start signal connected to the gate driving circuit. The gate driving circuit includes a Scan circuit and a light emission control driving circuit, the Scan circuit is configured to generate a Scan signal according to a clock signal, a power signal and a start signal, wherein the first Scan signal Scan1 and the second Scan signal Scan2 in the pixel circuit shown in fig. 7 may be generated by the Scan circuit. The light emission control circuit is used for generating a light emission control signal EM which is accessed by the light emission control module 360 shown in FIG. 7 according to the clock signal, the power signal and the start signal. The clock signals accessed by the scanning circuit and the light-emitting control circuit can be the same or different; the power supply signals accessed by the scanning circuit and the light-emitting control circuit can be the same or different; the scanning circuit and the light-emitting control circuit are connected with different real signals.
The embodiment of the invention also provides a driving method of the display panel, which comprises the following steps: driving the display panel according to the target display brightness level and gamma data corresponding to the target display brightness level; the gamma data is determined by the gamma data determining method of the display panel according to any embodiment of the present invention, and accordingly, when the display panel is driven by the driving method of the display panel according to the embodiment, color shift of the display panel can be improved under the intermediate display brightness level of the first display brightness level binding point and the second display brightness level binding point.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A gamma data determining method of a display panel, comprising:
acquiring a target gamma data set corresponding to a second display brightness level binding point in adjacent first display brightness level binding points and second display brightness level binding points; wherein, the brightness corresponding to the second display brightness level binding point is greater than the brightness corresponding to the first display brightness level binding point; the target gamma data set comprises a plurality of gray scales and gamma data corresponding to the gray scales;
determining at least one target gray scale and at least one intermediate display brightness level under the second display brightness level binding point, wherein the target gray scale corresponds to the intermediate display brightness level one by one, and the brightness of the target gray scale is matched with the brightness corresponding to the corresponding intermediate display brightness level; the intermediate display brightness level is between the first display brightness level binding point and the second display brightness level binding point;
determining at least one gamma data corresponding to an intermediate display brightness level corresponding to the target gray level according to at least one of the target gray level and the target gamma data set; the gamma data includes a gamma register value or a data voltage.
2. The gamma data determination method of a display panel according to claim 1, wherein the target gamma data group includes a plurality of binding point gray levels and gamma data corresponding to the binding point gray levels;
the determining at least one target gray scale and at least one intermediate display brightness level under the second display brightness level binding point comprises:
determining at least one of the binding point gray levels corresponding to the brightness between the first brightness and the second brightness as the target gray level; the first brightness is the brightness corresponding to the first display brightness level, and the second brightness is the brightness corresponding to the second display brightness level;
according to a first corresponding relation between the display brightness level and the brightness in a target display brightness level interval, determining the display brightness level matched with the brightness corresponding to the target gray level as the intermediate display brightness level; the target display brightness level interval is an interval taking the first display brightness level binding point and the second display brightness level binding point as interval endpoints;
preferably, according to the corresponding relation between the display brightness level and the brightness in the target display brightness level interval, the display brightness level of which the brightness difference corresponding to the target gray level is determined to be in a set range is determined to be the intermediate display brightness level;
Preferably, according to the correspondence between the display luminance level and the luminance in the target display luminance level section, the display luminance level determined to be equal to the luminance corresponding to the target gray level is determined as the intermediate display luminance level.
3. The method of determining gamma data of a display panel according to claim 2, wherein the determining a display luminance level matching a luminance corresponding to the target gray level as the intermediate display luminance level according to a first correspondence between a display luminance level and the luminance in a target display luminance level interval includes:
determining the brightness corresponding to the target gray scale according to the brightness corresponding to the second display brightness level binding point and the second corresponding relation between the gray scale and the brightness under the second display brightness level binding point;
and determining the intermediate display brightness level matched with the target gray level according to the brightness corresponding to the target gray level and the first corresponding relation.
4. The method for determining gamma data of a display panel according to claim 2, wherein before the acquiring the target gamma data group corresponding to the second display brightness level binding point in the adjacent first display brightness level binding point and second display brightness level binding point, the method comprises:
And gamma debugging is carried out on a plurality of binding point gray scales under each display brightness level binding point, and gamma data meeting the target brightness and the target chromaticity corresponding to the binding point gray scales are determined as gamma data corresponding to the binding point gray scales so as to obtain gamma data groups corresponding to each display brightness level.
5. The method of determining gamma data of a display panel according to claim 1, wherein the determining at least one gamma data corresponding to an intermediate display brightness level corresponding to the target gray level based on at least one of the target gray levels and the target gamma data group comprises:
and determining the gamma data corresponding to the target gray scale as the gamma data corresponding to the intermediate display brightness level corresponding to the target gray scale.
6. The gamma data determining method of a display panel according to claim 1, further comprising, after the determining of at least one gamma data corresponding to an intermediate display brightness level corresponding to the target gray scale from at least one of the target gray scale and the target gamma data group:
according to gamma data corresponding to two adjacent display brightness level binding points, interpolating and calculating gamma data corresponding to other display brightness levels between the two adjacent display brightness level binding points;
The display brightness level binding points comprise real binding points and virtual binding points, the real binding points comprise first display brightness level binding points and second display brightness level binding points, and the virtual binding points comprise the intermediate display brightness levels.
7. The gamma data determining method of claim 1, wherein determining at least one gamma data corresponding to an intermediate display brightness level corresponding to the target gray level based on at least one of the target gray levels and the target gamma data group, comprises:
determining gamma data corresponding to at least one maximum gray level under an intermediate display brightness level corresponding to the target gray level according to at least one target gray level and the target gamma data set;
after determining the gamma data corresponding to the maximum gray level under the intermediate display brightness level corresponding to the target gray level according to at least one target gray level and the target gamma data set, the method further comprises:
determining the brightness corresponding to other gray scales except the maximum gray scale of the middle display brightness level according to the brightness corresponding to the middle display brightness level;
determining the gray scales corresponding to other gray scales under the second display brightness level binding point under the intermediate display brightness level according to the brightness corresponding to the other gray scales;
And assigning the gamma data of the gray scale under the second display brightness level binding point to other gray scales under the intermediate display brightness level corresponding to the gray scale under the second display brightness level binding point.
8. The gamma data determining method of a display panel according to claim 1, further comprising, after the determining of at least one gamma data corresponding to an intermediate display brightness level corresponding to the target gray scale from at least one of the target gray scale and the target gamma data group:
and storing the gamma data.
9. A display panel characterized in that the gamma data is determined using the gamma data determining method of the display panel according to any one of claims 1 to 8;
preferably, in a target display brightness level section using the first display brightness level binding point and the second display brightness level binding point as section end points, other driving data except the gamma data under each display brightness level is the same;
preferably, the display panel includes a plurality of pixel circuits, the pixel circuits include a data writing module, a driving module and a light emitting module, the data writing module is used for writing the corresponding data voltage to a control end of the driving module, the driving module and the light emitting module are connected between a first power line and a second power line, and the other driving data include a first power voltage on the first power line and a second power voltage on the second power line;
Preferably, the pixel circuit further includes a first initialization module, where the first initialization module is configured to write a first initialization voltage to a control end of the driving module, and the other driving data further includes the first initialization voltage;
preferably, the pixel circuit further includes a second initialization module, the second initialization module is configured to write a second initialization voltage to the light emitting module, and the other driving data further includes the second initialization voltage;
preferably, the pixel circuit further includes a light emission control module, the driving module, and the light emission module are connected in series between the first power line and the second power line, the light emission control module is configured to control a conduction state between the first power line and the second power line according to a light emission control signal, and the other driving data further includes a duty ratio of the light emission control signal;
preferably, the display panel further comprises a gate driving circuit, and the driving data further comprises a clock signal, a power signal and a start signal which are connected to the gate driving circuit.
10. A driving method of a display panel, comprising:
Driving the display panel according to the target display brightness level and gamma data corresponding to the target display brightness level; wherein the gamma data is determined using the gamma data determining method of the display panel according to any one of claims 1 to 8.
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