CN112951170B - Display control method and preparation method of display panel and display device - Google Patents
Display control method and preparation method of display panel and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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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
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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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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Abstract
The application provides a display control method and a preparation method of a display panel and a display device. The display panel comprises a backlight module and a display module positioned on the light-emitting side of the backlight module, wherein the backlight module comprises a plurality of partitions, and each partition is provided with at least one light source; the display panel is provided with a plurality of sub-pixels; each of the partitions corresponds to one or more sub-pixels. The display control method comprises the following steps: acquiring the brightness diffusion coefficient of the subarea of the backlight module; for each sub-pixel, determining the display brightness of the sub-pixel according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel; and determining the brightness of each partition of the backlight module according to the original image data, controlling each partition to emit light according to the corresponding brightness, and controlling each sub-pixel to display at the corresponding display brightness.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display control method and a manufacturing method for a display panel, and a display device.
Background
The backlight module of the Mini LED display equipment comprises a plurality of partitions, each partition is provided with one or more lamp beads, and the lamp beads in different partitions can be independently controlled.
The Mini LED display device has a halo phenomenon during displaying, and particularly, the halo phenomenon is relatively obvious during HDR (high dynamic range) displaying of the display device, which affects the display effect of the display device and the user experience.
Disclosure of Invention
According to a first aspect of embodiments of the present application, there is provided a display control method of a display panel. The display panel comprises a backlight module and a display module positioned on the light-emitting side of the backlight module, the backlight module comprises a plurality of partitions, and each partition is provided with at least one light source; the display panel is provided with a plurality of sub-pixels; each of the partitions corresponds to one or more sub-pixels; the display control method comprises the following steps:
acquiring the brightness diffusion coefficient of the subarea of the backlight module;
for each sub-pixel, determining the display brightness of the sub-pixel according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel;
and determining the brightness of each partition of the backlight module according to the original image data, controlling each partition to emit light according to the corresponding brightness, and controlling each sub-pixel to display at the corresponding display brightness.
In one embodiment, the determining the display brightness of the sub-pixel according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient, and the gamma value of the display panel includes:
determining the gamma correction parameters according to the brightness diffusion coefficients and the corresponding relation between the gamma correction parameters and the brightness diffusion coefficients;
determining a corrected gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel;
and determining the display brightness of the sub-pixel according to the corrected gamma value and the gray-scale value of the sub-pixel.
In one embodiment, the determining the display brightness of the sub-pixel according to the modified gamma value and the gray-scale value of the sub-pixel includes:
the display brightness of the sub-pixel is calculated according to the following formula:
in the formula, L new -the display brightness of the sub-pixel;
gray-the Gray level value of the sub-pixel;
r new -a modified gamma value of the display panel;
bias — backlight leakage luminance of the display panel at zero gray scale.
In one embodiment, the determining the modified gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel includes:
calculating a modified gamma value of the display panel using the following formula:
γ new ＝F(σ)*γ org
in the formula, r new -a modified gamma value of the display panel;
f (σ) -Gamma correction parameter;
r org -gamma value of the display panel.
In one embodiment, the sub-pixels include liquid crystal molecules; the determining the brightness of each partition of the backlight module according to the original image data, controlling each partition to emit light according to the corresponding brightness, and controlling each sub-pixel to display with the corresponding display brightness includes:
determining the brightness of each subarea of the backlight module according to original image data, and controlling each subarea to emit light at the corresponding brightness;
determining the deflection angle of the liquid crystal molecules of each sub-pixel according to the brightness of the partition corresponding to each sub-pixel and the display brightness of each sub-pixel;
and controlling the liquid crystal molecules of each sub-pixel to deflect according to the corresponding deflection angle, so that each sub-pixel displays at the corresponding display brightness.
According to a second aspect of the embodiments of the present application, a display device is provided, where the display device includes a controller and a display panel, the display panel includes a backlight module and a display module located on a light exit side of the backlight module, the backlight module includes a plurality of partitions, and each partition is provided with at least one light source; the display panel is provided with a plurality of sub-pixels, and each partition corresponds to one or more sub-pixels;
the controller stores a program which can be called by the processor; wherein the processor implements the display control method described above when executing the program.
According to a third aspect of embodiments of the present application, there is provided a method of manufacturing a display panel including a plurality of sub-pixels; the preparation method comprises the following steps:
forming a backlight module, wherein the backlight module comprises a plurality of subareas, and each subarea is provided with at least one light source; each of the partitions corresponds to one or more sub-pixels;
controlling a light source of one partition of the backlight module to emit light, and controlling a camera device positioned at the light emitting side of the backlight module to shoot the backlight module to obtain an image;
determining the brightness diffusion coefficient of the subarea of the backlight module according to the position information and the brightness value of a plurality of points in the image, storing the brightness diffusion coefficient so as to determine the display brightness of each sub-pixel according to the gray-scale value of each sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel when the display panel displays, determining the brightness of each subarea of the backlight module according to original image data, controlling each subarea to emit light according to the corresponding brightness, and controlling each sub-pixel to display with the corresponding display brightness;
and forming a display module on the light emergent side of the backlight module.
In one embodiment, the light source of one of the partitions of the backlight module is controlled to emit light, and a camera device located at the light emitting side of the backlight module is controlled to shoot the backlight module to obtain an image; determining the brightness diffusion coefficient of the subarea of the backlight module according to the position information and the brightness values of the points in the image, wherein the brightness diffusion coefficient comprises the following steps:
selecting two or more than two subareas of the backlight module, respectively controlling the light sources of the subareas to emit light for each subarea, and controlling a camera device positioned at the light emitting side of the backlight module to shoot the backlight module to obtain images corresponding to the subareas;
respectively acquiring brightness diffusion coefficients corresponding to the two or more partitions according to the position information and the brightness values of a plurality of points in the image corresponding to the two or more partitions;
and calculating the average value of the brightness diffusion coefficients corresponding to the two or more than two partitions, and taking the average value as the brightness diffusion coefficient of the partition of the backlight module.
In one embodiment, determining the luminance diffusion coefficient of the partition of the backlight module according to the position information and the luminance values of the plurality of points in the image comprises:
performing curve fitting according to the position information and the brightness value of the plurality of points in the image to obtain a function of the brightness value on the position information;
and determining the brightness diffusion coefficient of the subarea of the backlight module according to the function of the brightness value on the position information.
In one embodiment, the distance between the camera device located at the light-emitting side of the backlight module and the backlight module is 50 cm-100 cm.
The embodiment of the application achieves the main technical effects that:
the display control method and the preparation method of the display panel and the display device provided by the embodiment of the application can determine the display brightness of the sub-pixel according to the brightness diffusion coefficient of the partition of the backlight module, the gray-scale value of the sub-pixel and the gamma value of the display panel when the display of the display panel is controlled, namely, the influence of the light of the partition adjacent to the partition corresponding to the sub-pixel is considered when the display brightness of the sub-pixel is determined, the halo phenomenon caused to appear in a display picture due to the influence of the light of the adjacent partition can be effectively improved, the display effect of the display panel can be improved, and the use experience of a user is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel provided in an exemplary embodiment of the present application;
fig. 2 is a top view of a backlight module according to an exemplary embodiment of the present disclosure;
FIG. 3 is a flowchart of a display control method of a display panel according to an exemplary embodiment of the present application;
fig. 4 is a flowchart of a method for manufacturing a display panel according to an exemplary embodiment of the present disclosure;
fig. 5 is a schematic diagram of a backlight module capturing an image by using a camera device according to an exemplary embodiment of the present application;
fig. 6 is a luminance distribution diagram when a sub-region of a backlight module emits light according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the exemplary embodiments below do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
As described in the background art, the conventional display panel has a halo phenomenon during display. The inventors found that the reason for this problem is that: backlight unit's a subregion corresponds with a plurality of sub-pixel, and backlight unit includes lamp pearl and a plurality of rete of piling up the setting usually, for example diffusion barrier, quantum dot membrane and membrane etc. that adds lustre to, the lamp pearl that backlight unit's subregion set up can take place the diffusion when luminous light, diffuses to the sub-pixel that other adjacent subregion correspond, influences the luminance of the sub-pixel that adjacent subregion corresponds to lead to display panel to appear the halo phenomenon when showing.
In order to solve the above problems, embodiments of the present application provide a display control method and a manufacturing method for a display panel, and a display device. The following describes a display control method and a manufacturing method of a display panel, and a display device in the embodiments of the present application in detail with reference to the accompanying drawings. Features in the embodiments described below may complement or be combined with each other without conflict.
The embodiment of the application provides a display control method of a display panel. Referring to fig. 1, the display panel 100 includes a backlight module 10 and a display module 20 located at a light emitting side of the backlight module 10. Referring to fig. 2, the backlight module 10 includes a plurality of partitions 11, and each partition 11 is provided with at least one light source. The display panel 100 has a plurality of sub-pixels, and each of the partitions 11 corresponds to one or more sub-pixels.
Each partition 11 of the backlight module 10 is independently controlled, all light sources of the partition 11 emit light simultaneously when a certain partition of the backlight module 10 is controlled, and the brightness of the light sources in the same partition 11 is the same.
In one embodiment, the plurality of partitions 11 of the backlight module 10 are arranged in an array. The pixels corresponding to the same partition 11 are affected by the light emitted from the partitions 11 adjacent to the partition.
In one embodiment, the light source is a lamp bead.
In one embodiment, the display module is a liquid crystal display module, and the sub-pixels include liquid crystal molecules. The luminance of the sub-pixels can be controlled by controlling the deflection angle of the liquid crystal molecules at a constant luminance of the light source in the division 11 corresponding to the sub-pixels.
Referring to fig. 3, the display control method includes the following steps 110 to 130. The steps will be described in detail below.
In step 110, the luminance diffusion coefficients of the partitions of the backlight module are obtained.
The brightness diffusion coefficient represents the brightness diffusion degree of the backlight module when the partitioned light sources emit light, and the larger the brightness diffusion coefficient is, the smaller the halo phenomenon degree of the display panel is; the smaller the luminance diffusion coefficient, the more pronounced the halo phenomenon of the display panel.
The brightness diffusion coefficient of the subareas of the backlight module is related to the structure of the backlight module, and the brightness diffusion coefficients of the subareas of the backlight module are basically the same because the structures of different subareas are the same.
In an embodiment, the luminance diffusion coefficients of the partitions of the backlight module may be pre-stored in a storage space of a display device where the display panel is located, and the luminance diffusion coefficients of the partitions of the backlight module may be obtained in a preparation process of the display panel and stored in the storage space of the display device, and the step 110 of obtaining the luminance diffusion coefficients of the partitions of the backlight module includes: and acquiring the stored brightness diffusion coefficient of the partition of the backlight module from the storage space of the display device where the display panel is located. The process of determining the luminance diffusion coefficient will be described in detail later.
In step 120, for each of the sub-pixels, the display brightness of the sub-pixel is determined according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient, and the gamma value of the display panel.
In one embodiment, the step 120 of determining the display brightness of the sub-pixel according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient, and the gamma value of the display panel includes the following steps:
firstly, the gamma correction parameters are determined according to the brightness diffusion coefficients and the corresponding relation between the gamma correction parameters and the brightness diffusion coefficients.
And then, determining the corrected gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel.
And then, determining the display brightness of the sub-pixel according to the corrected gamma value and the gray-scale value of the sub-pixel.
The gray-scale value of each sub-pixel refers to the gray-scale value of each sub-pixel in the original image data.
Therefore, the gamma correction parameters are determined according to the brightness diffusion coefficients, and the gamma value of the display panel is corrected according to the gamma correction parameters to obtain the corrected gamma value of the display panel, so that the display brightness of the sub-pixel determined according to the corrected gamma value and the gray-scale value of the sub-pixel and the influence of light rays emitted by the light source of the adjacent partition of the partition where the sub-pixel is located are corrected, and therefore when the sub-pixel is controlled to display according to the determined display brightness, the halo phenomenon caused by the influence of the light source in the adjacent partition can be improved, the display effect of the display panel is improved, and the use experience of a user is improved.
In one embodiment, the determining the modified gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel includes:
calculating a corrected gamma value of the display panel using the following formula (1):
γ new ＝F(σ)*γ org (1)
in the formula, r new -a modified gamma value of the display panel;
f (σ) -Gamma correction parameter;
r org -gamma value of the display panel.
In this way, the gamma value after the correction of the display panel can be determined by substituting the gamma correction parameter and the gamma value of the display panel into the formula (1), and the calculation is relatively simple.
The F (σ) can be obtained by the correspondence between the gamma correction parameter and the luminance diffusion coefficient.
In one embodiment, the gamma correction parameter and the luminance spread coefficient may be related as shown in the following expression (2):
F(σ)＝a*σ+b (2)
wherein, σ represents the brightness diffusion coefficient of the subareas of the backlight module;
f (σ) -Gamma correction parameter;
a is a constant;
b-constant.
The values of the constants a and b are related to the structure of the display panel, that is, the specific values thereof are related to the size of the sub-area of the backlight module 10, the distance between adjacent sub-areas, the distance between the display module 20 and the backlight module 10, and other parameters. When the distance between the display module 20 and the backlight module 10 is larger, the value of the constant a is larger; the larger the spacing between adjacent partitions, the larger the values of constant a and constant b. When the gamma correction parameters and the brightness diffusion coefficient are different, the values of the constants in different relations are all related to the structure of the display panel. For the display panel that has been prepared, the values of the constant a and the constant b are constant values. The values of constant a and constant b can be determined by performing tests.
The relation between the gamma correction parameter and the luminance spread coefficient shown in the above formula (2) is a linear function, but in other embodiments, the relation between the gamma correction parameter and the luminance spread coefficient may be a functional expression of other forms, such as a polynomial function.
In one embodiment, the step of determining the display brightness of the sub-pixel according to the modified gamma value and the gray scale value of the sub-pixel includes:
the display luminance of the sub-pixel is calculated according to the following formula (3):
in the formula, L new -the display brightness of the sub-pixels;
gray-the Gray level value of the sub-pixel;
r new -a modified gamma value of the display panel;
bias — backlight leakage luminance of the display panel at zero gray scale.
The display brightness of each sub-pixel can be obtained by substituting the gamma value corrected by the display panel and the gray-scale value of each sub-pixel into the formula (3), and the calculation is simple. The backlight light leakage brightness of the display panel under the zero gray scale is a constant and can be obtained through testing, and the backlight light leakage brightness of the prepared display panel under the zero gray scale is a constant value.
In step 130, the brightness of each partition of the backlight module is determined according to the original image data, each partition is controlled to emit light according to the corresponding brightness, and each sub-pixel is controlled to display at the corresponding display brightness.
In this embodiment, the step 130 of determining the brightness of each partition of the backlight module according to the original image data, controlling each partition to emit light according to the corresponding brightness, and controlling each sub-pixel to display at the corresponding display brightness includes the following steps:
and determining the brightness of each subarea of the backlight module according to the original image data, and controlling each subarea to emit light with corresponding brightness.
And then, determining the deflection angle of the liquid crystal molecules of each sub-pixel according to the brightness of the partition corresponding to each sub-pixel and the display brightness of each sub-pixel.
And then controlling the liquid crystal molecules of each sub-pixel to deflect according to the corresponding deflection angle, so that each sub-pixel displays at the corresponding display brightness.
In one embodiment, the controller generates a driving signal according to the brightness of each partition in the original image data, and controls the light source of each partition to emit light according to the driving signal, so that each partition emits light with corresponding brightness.
In one embodiment, on the premise that the partition brightness of the backlight module corresponding to the sub-pixel is constant, the display brightness of the sub-pixel corresponds to the deflection angle of the liquid crystal molecules. The deflection angle of the liquid crystal molecules of the sub-pixel can be determined according to the display brightness of the sub-pixel and the corresponding relation between the display brightness of the sub-pixel and the deflection angle of the liquid crystal molecules.
When the display of the display panel is controlled by adopting the traditional display control method, the phenomenon of relatively obvious halo exists in the picture displayed by the display panel; when the display control method provided by the embodiment of the application is adopted to control the display of the display panel, the picture displayed by the display panel has no obvious halo phenomenon. It can be shown that the display control method provided by the embodiment of the present application can significantly improve the halo phenomenon of the picture displayed by the display panel.
The display control method of the display panel provided by the embodiment of the application determines the display brightness of the sub-pixel according to the brightness diffusion coefficient of the partition of the backlight module, the gray-scale value of the sub-pixel and the gamma value of the display panel, namely, the influence of the light of the partition adjacent to the partition corresponding to the sub-pixel is considered when determining the display brightness of the sub-pixel, so that the halo phenomenon occurring in a display picture due to the influence of the light of the adjacent partition can be effectively improved, the display effect of the display panel can be improved, and the use experience of a user is improved.
The embodiment of the application further provides a display device. The display device comprises a controller and a display panel, wherein the display panel comprises a backlight module and a display module positioned on the light-emitting side of the backlight module, the backlight module comprises a plurality of partitions, and each partition is provided with at least one light source; the display panel is provided with a plurality of sub-pixels, and each partition corresponds to one or more sub-pixels. The controller stores a program which can be called by the processor; wherein the processor implements the display control method according to any of the above embodiments when executing the program.
In one embodiment, the display device is a liquid crystal display device and the sub-pixels comprise liquid crystal molecules.
The display device further comprises a shell, and the display panel is embedded in the shell. The controller may be a chip, and the chip may be bound in a binding region of the display panel.
The controller can comprise a backlight driving chip and an image driving chip, wherein the backlight driving chip is used for controlling the partition light emission of the backlight module according to the original image data, and the image driving chip is used for determining the display brightness of each sub-pixel and controlling the liquid crystal molecule deflection of each sub-pixel.
The display device provided by the embodiment of the application can be any equipment with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a vehicle-mounted equipment and the like.
The embodiment of the application also provides a preparation method of the display panel. The display panel includes a plurality of sub-pixels. Referring to fig. 4, the method for manufacturing the display panel includes the following steps 210 to 240. The respective steps will be described in detail below.
In step 210, forming a backlight module, wherein the backlight module comprises a plurality of partitions, and each partition is provided with at least one light source; each of the partitions corresponds to one or more sub-pixels.
The backlight module can comprise a supporting part, and the light source can be fixedly arranged on the supporting part. The light source can be lamp beads, and the backlight module can be prepared from hundreds or thousands of lamp beads through crystal fixing and packaging processes.
The backlight module can also comprise a plurality of film layers positioned on the light-emitting side of the light source, for example, the film layers comprise diffusion films, quantum dot films, brightness enhancement films and the like.
In step 220, a light source of one of the partitions of the backlight module is controlled to emit light, and a camera device located at a light emitting side of the backlight module is controlled to shoot the backlight module to obtain an image.
Referring to fig. 5, the camera 30 is located on the light emitting side of the backlight module 10, and the distance h between the camera 30 and the backlight module 10 ranges from 50cm to 100 cm. With such an arrangement, not only the problem that the whole backlight module 10 cannot be completely shot due to the excessively small distance between the camera device 30 and the backlight module 10 can be avoided, but also the problem that the shot image accuracy is low due to the excessively large distance between the camera device 30 and the backlight module 10 can be avoided. In some embodiments, the distance h between the image capturing device 30 and the backlight module 10 is, for example, 50cm, 60cm, 70cm, 80cm, 90cm, 100cm, and the like.
When the camera shooting device shoots, only one subarea of the backlight module emits light, and other subareas do not emit light, so that the brightness diffusion condition when one subarea emits light is reflected by the image shot by the camera shooting device.
In step 230, a brightness diffusion coefficient of a partition of the backlight module is determined according to the position information and the brightness values of the plurality of points in the image, the brightness diffusion coefficient is stored, so that the display brightness of each sub-pixel is determined according to the gray-scale value of each sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel when the display panel displays, the brightness of each partition of the backlight module is determined according to the original image data, each partition is controlled to emit light according to the corresponding brightness, and each sub-pixel is controlled to display with the corresponding display brightness.
After the image is shot by the camera device, the brightness values and the position information of a plurality of points in the image can be collected. The brightness of the sub-area which emits light when the image pickup device shoots the image is the brightness when the display gray scale is 255 gray scale. Therefore, the error of the brightness values of a plurality of points in the acquired image is small, and the subsequently determined brightness diffusion coefficient is more accurate.
In one embodiment, the step of determining the luminance diffusion coefficient of the partition of the backlight module according to the position information and the luminance values of the plurality of points in the image includes the following steps:
firstly, according to the position information and the brightness value of a plurality of points in the image, curve fitting is carried out to obtain a function of the brightness value relative to the position information.
The position information and the brightness value of a plurality of points in the image can be collected, and the more the number of the points is, the higher the accuracy of the obtained brightness diffusion coefficient is. The acquired data of the plurality of points includes position information and brightness values, the data of the plurality of points is discrete data, and the data of the plurality of points can be fitted to obtain a point spread dispersion function, that is, a function of the brightness values with respect to the position information, as shown in the following formula (3):
wherein F (x) -brightness value;
sigma is the brightness diffusion coefficient of the subareas of the backlight module;
x-the distance between the point to the center of the illuminated partition.
Fig. 6 is a graph showing the relationship between the luminance values f (x) of the plurality of points obtained by fitting and the distance x between the points and the center of the luminous partition. In fig. 6, the ordinate is the normalized luminance value, the abscissa is the distance from a point to the center of a light-emitting partition, and the positive and negative values of the abscissa represent positions on different sides of the partition. As can be seen from fig. 5, the larger the distance from the center of the light-emitting partition, the smaller the luminance value of the dot. That is, the larger the distance between the sub-pixel and the center of the other partition other than the corresponding partition, the less the sub-pixel is affected by the other partition.
And then, determining the brightness diffusion coefficient of the subarea of the backlight module according to the function of the brightness value on the position information.
After the formula (3) is obtained by fitting, the values of the luminance spread coefficients σ of the partitions of the backlight module may be determined according to the formula (3).
The process of determining the display brightness of each sub-pixel according to the gray-scale value of each sub-pixel, the brightness diffusion coefficient, and the gamma value of the display panel when the display panel displays can refer to the above embodiment of the display control method of the display panel, and is not described herein again.
In one embodiment, the light source of one of the partitions of the backlight module is controlled to emit light, and a camera device located at the light emitting side of the backlight module is controlled to shoot the backlight module to obtain an image; determining the brightness diffusion coefficient of the subarea of the backlight module according to the position information and the brightness values of the points in the image, wherein the step comprises the following steps:
firstly, two or more than two subareas of the backlight module are selected, for each subarea, the light source of the subarea is respectively controlled to emit light, and a camera device positioned at the light-emitting side of the backlight module is controlled to shoot the backlight module to obtain an image corresponding to the subarea.
In this step, only one of the subareas emits light when the image is captured by the image capturing device, and none of the other subareas emits light.
Then, respectively acquiring brightness diffusion coefficients corresponding to the two or more partitions according to the position information and the brightness values of a plurality of points in the image corresponding to the two or more partitions;
and then, calculating the average value of the brightness diffusion coefficients corresponding to the two or more than two subareas, and taking the average value as the brightness diffusion coefficient of the subarea of the backlight module.
The image when two or more than two subareas independently emit light is obtained, the brightness diffusion coefficient corresponding to each image is determined according to the two or more than two images, the average value of the brightness diffusion coefficient is obtained, the average value is used as the brightness diffusion coefficient of the subareas of the backlight module, the accuracy of the obtained brightness diffusion coefficient is higher, the display brightness of the sub-pixels determined by the display panel according to the brightness diffusion coefficient is more accurate when the display panel displays, the halo phenomenon of the display panel is more favorably improved, and the display effect of the display panel is improved.
In step 240, a display module is formed on the light emitting side of the backlight module.
In this step, the display module may include a pixel driving circuit and a liquid crystal layer located on a side of the pixel driving circuit away from the backlight module. The liquid crystal layer comprises a first electrode, a second electrode positioned on one side of the first electrode, which is far away from the pixel driving circuit, and liquid crystal molecules positioned between the first electrode and the second electrode. The first electrode may be an anode and the second electrode may be a cathode. The sub-pixels include liquid crystal molecules.
In one embodiment, after step 240, the method for manufacturing a display panel may further include: and a color filter layer, a glass substrate, a polaroid and the like are sequentially formed on one side of the display module, which is far away from the backlight module.
It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (7)
1. The display control method of the display panel is characterized in that the display panel comprises a backlight module and a display module positioned on the light emitting side of the backlight module, the backlight module comprises a plurality of subareas, and each subarea is provided with at least one light source; the display panel is provided with a plurality of sub-pixels; each of the partitions corresponds to one or more sub-pixels; the display control method comprises the following steps:
acquiring the brightness diffusion coefficient of the subarea of the backlight module;
for each sub-pixel, determining the display brightness of the sub-pixel according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel;
determining the brightness of each partition of the backlight module according to original image data, controlling each partition to emit light according to the corresponding brightness, and controlling each sub-pixel to display at the corresponding display brightness;
the determining the display brightness of the sub-pixel according to the gray-scale value of the sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel includes:
determining the gamma correction parameters according to the brightness diffusion coefficients and the corresponding relation between the gamma correction parameters and the brightness diffusion coefficients;
determining a corrected gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel;
according to the corrected gamma value and the gray-scale value of the sub-pixel, calculating the display brightness of the sub-pixel according to the following formula:
in the formula, L new -the display brightness of the sub-pixels;
gray-the Gray level value of the sub-pixel;
r new -a modified gamma value of the display panel;
bias-backlight leakage luminance of the display panel at zero gray scale;
the sub-pixels include liquid crystal molecules; the determining the brightness of each partition of the backlight module according to the original image data, controlling each partition to emit light according to the corresponding brightness, and controlling each sub-pixel to display with the corresponding display brightness includes:
determining the brightness of each subarea of the backlight module according to original image data, and controlling each subarea to emit light at the corresponding brightness;
determining the deflection angle of the liquid crystal molecules of each sub-pixel according to the brightness of the partition corresponding to each sub-pixel and the display brightness of each sub-pixel;
and controlling the liquid crystal molecules of each sub-pixel to deflect according to the corresponding deflection angle, so that each sub-pixel displays at the corresponding display brightness.
2. The method as claimed in claim 1, wherein the determining the modified gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel comprises:
calculating the corrected gamma value of the display panel by adopting the following formula:
γ new ＝F(σ)*γ org
in the formula, r new -a modified gamma value of the display panel;
f (σ) -gamma correction parameters;
r org -gamma value of the display panel.
3. A display device is characterized by comprising a controller and a display panel, wherein the display panel comprises a backlight module and a display module positioned on the light emitting side of the backlight module, the backlight module comprises a plurality of subareas, and each subarea is provided with at least one light source; the display panel is provided with a plurality of sub-pixels, and each partition corresponds to one or more sub-pixels;
the controller stores a program which can be called by the processor; wherein the processor implements the display control method according to claim 1 or 2 when executing the program.
4. The preparation method of a display panel, characterized by, the said display panel includes a plurality of sub-pixel; the preparation method comprises the following steps:
forming a backlight module, wherein the backlight module comprises a plurality of subareas, and each subarea is provided with at least one light source; each of the partitions corresponds to one or more sub-pixels;
controlling a light source of one partition of the backlight module to emit light, and controlling a camera device positioned at the light emitting side of the backlight module to shoot the backlight module to obtain an image;
determining the brightness diffusion coefficient of the subarea of the backlight module according to the position information and the brightness value of a plurality of points in the image, storing the brightness diffusion coefficient so as to determine the display brightness of each sub-pixel according to the gray-scale value of each sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel when the display panel displays, determining the brightness of each subarea of the backlight module according to the original image data, controlling each subarea to emit light according to the corresponding brightness, and controlling each sub-pixel to display with the corresponding display brightness;
forming a display module on the light-emitting side of the backlight module;
when the display panel displays, determining the display brightness of each sub-pixel according to the gray-scale value of each sub-pixel, the brightness diffusion coefficient and the gamma value of the display panel, including:
when the display panel displays, the gamma correction parameters are determined according to the brightness diffusion coefficients and the corresponding relation between the gamma correction parameters and the brightness diffusion coefficients; determining a corrected gamma value of the display panel according to the gamma correction parameter and the gamma value of the display panel; according to the corrected gamma value and the gray-scale value of the sub-pixel, calculating the display brightness of the sub-pixel according to the following formula:
in the formula, L new -the display brightness of the sub-pixels;
gray-the Gray level value of the sub-pixel;
r new -a modified gamma value of the display panel;
bias-backlight leakage luminance of the display panel at zero gray scale;
the sub-pixels include liquid crystal molecules; the display panel determines the brightness of each partition of the backlight module according to the original image data, controls each partition to emit light according to the corresponding brightness, and controls each sub-pixel to display with the corresponding display brightness, and the method comprises the following steps:
determining the brightness of each subarea of the backlight module according to original image data, and controlling each subarea to emit light at the corresponding brightness; determining the deflection angle of the liquid crystal molecules of each sub-pixel according to the brightness of the partition corresponding to each sub-pixel and the display brightness of each sub-pixel; and controlling the liquid crystal molecules of each sub-pixel to deflect according to the corresponding deflection angle, so that each sub-pixel displays at the corresponding display brightness.
5. The method according to claim 4, wherein the light source of one of the sub-regions of the backlight module is controlled to emit light, and a camera device located at a light-emitting side of the backlight module is controlled to capture the backlight module to obtain an image; determining the brightness diffusion coefficient of the subarea of the backlight module according to the position information and the brightness values of the points in the image, wherein the brightness diffusion coefficient comprises the following steps:
selecting two or more than two subareas of the backlight module, respectively controlling the light sources of the subareas to emit light for each subarea, and controlling a camera device positioned at the light emitting side of the backlight module to shoot the backlight module to obtain images corresponding to the subareas;
respectively acquiring brightness diffusion coefficients corresponding to the two or more partitions according to the position information and the brightness values of a plurality of points in the image corresponding to the two or more partitions;
and calculating the average value of the brightness diffusion coefficients corresponding to the two or more than two partitions, and taking the average value as the brightness diffusion coefficient of the partition of the backlight module.
6. The method of claim 4, wherein determining the luminance spread coefficients of the partitions of the backlight module according to the position information and the luminance values of the plurality of points in the image comprises:
performing curve fitting according to the position information and the brightness values of the plurality of points in the image to obtain a function of the brightness values about the position information;
and determining the brightness diffusion coefficient of the subarea of the backlight module according to the function of the brightness value on the position information.
7. The method of claim 4, wherein a distance between the camera device at the light exit side of the backlight module and the backlight module is in a range of 50cm to 100 cm.
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| JP4612406B2 (en) * | 2004-02-09 | 2011-01-12 | 株式会社日立製作所 | Liquid crystal display device |
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