CN109545128B - Method for improving low-gray-scale color cast and OLED display panel - Google Patents
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The embodiment of the invention discloses a method for improving low-gray scale color cast and an OLED display panel, which comprises the following steps: and acquiring a first lighting rule for lighting a set pixel unit by adopting a first brightness value in a set time period in each refreshing period of the OLED display panel under any low gray scale state, and controlling the OLED panel to display by adopting the first lighting rule. Because the first brightness value for lighting the pixel units in the first lighting rule is greater than the second brightness value for lighting all the pixel units in the whole refresh period, because the OLED is a current-driven device, when the OLED display panel is controlled to display by using the first lighting rule, the brightness of the set pixel units is increased, the control current of the TFT is correspondingly increased, and because the current control capability of the TFT is enhanced, the influence of the leakage current of the TFT on the color cast is reduced, so that the problem of low gray scale color cast of the OLED display panel can be effectively improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method for improving low-gray-scale color cast and an OLED display panel.
Background
In an OLED (Organic Light-Emitting Diode) device, due to the nature of the material itself, the hole mobility of the hole injection layer is high, and the material of the hole injection layer is conductive in both the lateral and longitudinal directions. The OLED device includes pixels of three colors of red, green, and blue, and there is a difference in lighting voltage between the pixels of different colors. When the pixel with the color with higher working voltage is lighted, the current is transversely conducted through the hole injection layer due to the influence of crosstalk current or TFT (Thin Film Transistor) leakage current, and the pixel with the color with low lighting voltage can be lightly lighted, so that the phenomenon that the OLED panel is impure in single color and has color distortion to a certain degree when being lighted with lower gray scale is called as low gray scale color cast. The prior art methods for solving the color cast of the low gray level mainly include reducing the doping ratio of the dopant in the hole injection layer to reduce the hole mobility, reducing the thickness of the hole injection layer to reduce the lateral conductivity, and the like. As can be seen from the analysis, although these methods can improve the color shift of the low gray scale to some extent, the manufacturing process of the OLED is often complicated, and the overall performance of the display panel is affected to some extent.
In view of the foregoing, there is a need for a method for improving low gray scale color shift, which can solve the problem of low gray scale color shift of the OLED display panel in the prior art without affecting the structure and overall performance of the OLED display panel.
Disclosure of Invention
The invention provides a method for improving low gray scale color cast, which is used for solving the problem of low gray scale color cast of an OLED display panel in the prior art under the condition of not influencing the structure and the overall performance of the OLED panel.
The method for improving the low gray scale color cast provided by the embodiment of the invention comprises the following steps:
acquiring a first lighting rule, wherein the first lighting rule is that a set pixel unit is lighted by adopting a first brightness value in a set time period in each refreshing period under any low gray scale state; wherein the first brightness value is greater than the second brightness value, a product of the first brightness value and a set proportion value is equal to a second brightness value, the set proportion value is determined according to the set time period and/or the set pixel units, and the second brightness value is a brightness value for lighting all pixel units of the OLED display panel in the whole refresh cycle;
and controlling the OLED display panel to display by adopting the first lighting rule.
Optionally, the first lighting rule is:
lighting all pixel units of the OLED display panel by using the first brightness value in a set time period in each refreshing period; wherein the set time period is less than a refresh cycle of the OLED display panel.
Optionally, the set proportion value is:
and the duration of the set time period is in proportion to the total duration of the refresh cycle.
Optionally, the set time period is composed of a plurality of mutually non-overlapping set sub-time periods, and a total duration of the plurality of set sub-time periods is equal to a duration of the set time period.
Optionally, the first lighting rule is:
lighting the set pixel unit by adopting a first brightness value in the whole refreshing period of each refreshing period; the number of the set pixel units is smaller than the number of all the pixel units in the OLED display panel.
Optionally, the set proportion value is:
and the number of the set pixel units accounts for the proportion of the total number of the pixel units of the whole OLED display panel.
Optionally, the set pixel unit in the OLED display panel is determined by:
dividing the OLED display panel into a plurality of same pixel regions; the shapes of the pixel areas and the number of the included pixel units are the same;
selecting one or more pixel units as the setting pixel units in each pixel region; the number of the set pixel units in each pixel region and the positions of the set pixel units in each pixel region are the same.
Another embodiment of the present invention provides an OLED display panel, which includes a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory, and executing any one of the above methods according to the obtained program.
Another embodiment of the present invention provides a computer storage medium having stored thereon computer-executable instructions for causing a computer to perform any one of the methods described above.
In the embodiment of the invention, a first lighting rule that a set pixel unit is lighted by a first brightness value in a set time period in each refreshing period of an OLED display panel in any low gray scale state is firstly acquired, and then the OLED panel is controlled to display by adopting the first lighting rule. Because the first brightness value for lighting the pixel units in the first lighting rule is greater than the second pixel value for lighting all the pixel units in the whole refresh period of the OLED display panel, when the OLED display panel is controlled to display by using the first lighting rule, the brightness of the set pixel units is increased, and because the OLED is a current-driven device, the control current of the TFT of the set pixel units is correspondingly increased, the current control capability of the TFT is enhanced, the proportion of leakage current is reduced, the influence of the leakage current of the TFT in the set pixel units on the color cast is reduced, and therefore the problem of low gray scale color cast of the OLED display panel is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart illustrating a method for improving low gray scale color shift according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The low gray scale referred to in the embodiments of the present invention means a gray scale of less than 64.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
Fig. 1 shows a schematic flowchart corresponding to a data compression method applied to a vector space in an embodiment of the present invention, and as shown in fig. 1, the method includes:
step S101, acquiring a first lighting rule, wherein the first lighting rule is that a set pixel unit is lighted by a first brightness value in a set time period in each refreshing period under any low gray scale state; wherein the first brightness value is greater than the second brightness value, a product of the first brightness value and a set proportion value is equal to a second brightness value, the set proportion value is determined according to the set time period and/or the set pixel units, and the second brightness value is a brightness value for lighting all pixel units of the OLED display panel in the whole refresh cycle;
and S102, controlling the OLED display panel to display by adopting the first lighting rule.
Because the first brightness value for lighting the pixel units in the first lighting rule is greater than the second pixel value for lighting all the pixel units in the whole refresh period of the OLED display panel, when the OLED display panel is controlled to display by using the first lighting rule, the brightness of the set pixel units is increased, and because the OLED is a current-driven device, the control current of the TFT of the set pixel units is correspondingly increased, the current control capability of the TFT is enhanced, the proportion of leakage current is reduced, the influence of the leakage current of the TFT in the set pixel units on the color cast is reduced, and therefore the problem of low gray scale color cast of the OLED display panel is solved.
Specifically, in step S101, the set time period may be equal to one refresh cycle, or may be a partial time period in one refresh cycle. Similarly, the set pixel units may be all pixel units in the OLED display panel, or may be a part of pixel units in the OLED display panel.
Depending on the different choices of the setting time period and the setting pixel unit, the embodiment of the present invention provides two possible implementations of the first lighting rule:
the implementation mode is as follows: controlling the lighting time
In a first implementation manner, the first lighting rule is specifically that all pixel units of the OLED display panel are lighted with the first brightness value within a set time period in each refresh cycle.
The first implementation focuses on controlling the lighting time of the pixel unit, i.e. the size of the set time period. Specifically, in the first implementation manner, the duration of the set time period is less than the duration of the refresh cycle of the OLED display panel, and the set time period may be a continuous time period within one refresh cycle, or may also be a time period formed by a plurality of non-overlapping set sub-time periods, but the total duration of each set sub-time period is the duration of the set time period.
The first brightness value is larger than a second brightness value for lighting all pixel units of the OLED display panel in the whole refreshing period, and the product of the first brightness value and the proportion of the duration of the set time period to the total duration of the refreshing period is equal to the second brightness value.
Since the product of the first brightness value and the proportion of the duration of the set time period to the total duration of the refresh period is equal to the second brightness value, in one refresh period, compared with the case that all the pixel units of the OLED display panel are lighted by the second brightness value in the whole refresh period, the sum of the integrals of the brightness values of all the pixel units in the OLED display panel to the time is still equal, therefore, under the condition of controlling the OLED display panel to be in a certain low gray scale, the first lighting rule is adopted to increase the brightness of the set pixel unit and increase the control current of the TFT corresponding to the set pixel unit so as to improve the phenomenon of low gray scale color cast, however, for the human eye, since the integral of the luminance value of the pixel unit to the time is not changed in one refresh period, the overall luminance of the OLED display panel is not changed.
For example, table 1 exemplarily shows the luminance of different low gray-scale pictures corresponding to different first luminance values.
TABLE 1
Taking the 4-gray scale as an example, if the brightness value of all the pixel units of the OLED display panel lighted in the whole refresh period is 120nits, the brightness of the OLED panel lighted by the current controlled by the TFT of the pixel unit is 0.012862 nits; when all the pixel cells of the OLED display panel were lit at a luminance of 350nits for 65% of the entire refresh period, the current controlled by the TFTs of the pixel cells lit the OLED panel at a luminance of 0.037516 nits; when all the pixel cells of the OLED display panel were lit at a luminance of 600nits for 20% of the total refresh period, the current controlled by the TFTs of the pixel cells lit the OLED panel at a luminance of 0.064312 nits.
It can be seen that, if the overall brightness of the OLED display panel is not changed, when the pixel unit of the OLED display panel is lit at a larger brightness value, the lighting duration in one refresh cycle is shorter (i.e. the shorter the setting time period is, the smaller the proportion of the duration of the setting time period to the total duration of the refresh cycle is, and accordingly, the larger the black insertion proportion is), the larger the control current of the TFT is, so that the current control capability of the TFT is increased, the influence of the leakage current on the color shift is reduced, and the low gray scale is easier to adjust, thereby improving the phenomenon of low gray scale color shift.
It can also be seen from table 1 that, when the control current of the TFT is of the same magnitude, the luminance of 120nits corresponds to 8 gray levels, the luminance of 350nits corresponds to 5 gray levels, and the luminance of 600nits corresponds to 4 gray levels, i.e., the larger the luminance of the pixel unit, the lower the gray level that the pixel unit can be adjusted to.
The implementation mode two is as follows: controlling lighting area
In the second implementation manner, the first lighting rule is to light the set pixel unit with the first luminance value in the whole refresh period of each refresh period.
The second embodiment focuses on controlling the lighting area of the pixel unit, that is, setting the number of the pixel units. Specifically, in the second implementation manner, the number of the pixel units is set to be smaller than the number of all the pixel units in the OLED display panel.
The first brightness value is larger than a second brightness value of all pixel units of the OLED display panel in the whole refreshing period, and the product of the first brightness value and the proportion of the number of the set pixel units to the total number of the pixel units of the whole OLED display panel is equal to the second brightness value.
In the second implementation manner, the set pixel units are preferably selected uniformly among all the pixel units of the OLED display panel. For example, the OLED display panel is divided into a plurality of identical pixel regions; the shapes of the pixel areas and the number of the included pixel units are the same; one or more pixel units are selected as setting pixel units in each pixel area, and the number of the setting pixel units in each pixel area and the positions of the setting pixel units in each pixel area are the same.
Since the product of the first brightness value and the ratio of the number of the set pixel units to the total number of the pixel units of the whole OLED display panel is equal to the second brightness value, the product of the number of the set pixel units in the pixel region and the first brightness value is equal to the product of the total number of the pixel units in the pixel region and the second brightness value, so that the whole brightness of the pixel region in one refresh period is still unchanged, but the magnitude of the control current of the TFT of the set pixel unit is changed to the reciprocal of the ratio of the number of the set pixel units to the total number of the pixel units of the whole OLED display panel, and as the magnitude of the control current of the TFT of the set pixel unit is increased, the current control capability of the TFT is enhanced, and the influence of the leakage current on low gray scale color shift is correspondingly reduced.
If a square composed of 4 pixel units is used as a pixel area, and a pixel unit at a fixed position (for example, the pixel unit at the upper right corner) is selected as a set pixel unit in all pixel areas of the OLED display panel, when the set pixel unit is lit at a first brightness value in the whole refresh cycle by adopting the first lighting rule in the implementation mode two, the magnitude of the control current of the TFT of the set pixel unit is 4 times of the TFT control current for lighting all the pixel units of the OLED display panel at a second brightness value, and it can be seen that the smaller the proportion of the number of the set pixel units to the total number of the pixel units in the OLED display panel is, the larger the TFT control current of each set pixel unit is, the more controllable the current is, and accordingly, the smaller the influence of the leakage current on the color cast is.
Table 2 exemplarily shows the luminance of different low gray scale pictures corresponding to different first luminance values at each low gray scale when the total number of the OLED display panels is set to 1/4.
TABLE 2
In table 2, 120nits is the second luminance value at which all the pixel cells in the OLED display panel are lit, and 480nits is the first luminance value at which only the 1/4 pixel cells in the OLED display panel are lit. As can be seen from table 2, taking the 4 gray levels as an example, the luminance of the OLED panel turned on by the current controlled by the TFT of the pixel cell corresponding to 480nits is 0.05145nits, which is significantly greater than 0.012862nits corresponding to 120nits, so that when the set pixel cell in the OLED display panel is turned on by the first lighting rule in the second implementation, the current control capability of the TFT is significantly enhanced, the proportion of the leakage current in the total current of the TFT is reduced, and accordingly, the phenomenon of low gray level color cast due to the leakage current is also improved.
It can also be seen from table 2 that when the control currents of the TFTs are at the same magnitude, the gray scales of the pixel units are significantly different. When the luminance value is 480nits, 0.05145nits is corresponded to the 4 gray level, and 0.0591nits is corresponded to the 8 gray level when the luminance value is 120 nits. It can be seen that the smaller the lighting area in the OLED display panel (i.e. the smaller the proportion of the number of the set pixel units to the total number of the pixel units in the OLED display panel, and correspondingly, the higher the proportion of the off pixels), the lower the gray scale that can be adjusted by the set pixel units.
Of course, in the embodiment of the present invention, the first implementation manner and the second implementation manner may also be combined, and the lighting time and the lighting area of the pixel lighting unit are controlled at the same time, which is not described herein again.
In step S102, the OLED display panel is controlled to display according to the first lighting rule.
Based on the same inventive concept, the present invention also provides another OLED Display panel, where the OLED Display panel may include a Central Processing Unit (CPU), a memory, an input/output device, and the like, the input device may include a keyboard, a mouse, a touch screen, and the like, and the output device may include a Display device, such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), and the like.
The memory may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides the processor with program instructions and data stored in the memory. In an embodiment of the present invention, the memory may be used to store a program of the above method for improving low gray scale color shift.
The processor is used for executing the method for improving the low gray scale color cast according to the obtained program instructions by calling the program instructions stored in the memory.
Based on the same inventive concept, embodiments of the present invention provide a computer storage medium for storing computer program instructions for the above-mentioned computing device, which includes a program for executing the above-mentioned method for improving low gray scale color shift.
The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.
From the above, it can be seen that:
in the embodiment of the invention, a first lighting rule that a set pixel unit is lighted by a first brightness value in a set time period in each refreshing period of an OLED display panel in any low gray scale state is firstly acquired, and then the OLED panel is controlled to display by adopting the first lighting rule. Because the first brightness value for lighting the pixel units in the first lighting rule is greater than the second brightness value for lighting all the pixel units in the whole refresh period of the OLED display panel, when the OLED display panel is controlled to display by using the first lighting rule, the brightness of the set pixel units is increased, and because the OLED is a current-driven device, the control current of the TFT of the set pixel units is correspondingly increased, the current control capability of the TFT is enhanced, the proportion of leakage current is reduced, and the influence of the leakage current of the TFT in the set pixel units on color cast is reduced, thereby improving the problem of low gray scale color cast of the OLED display panel.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for improving low gray scale color shift is applied to the influence of transverse conduction caused by leakage current of a TFT in a set pixel unit in an OLED display panel on the color shift, and comprises the following steps:
acquiring a first lighting rule, wherein the first lighting rule is that a set pixel unit is lighted by adopting a first brightness value in a set time period in each refreshing period under any low gray scale state; wherein the first brightness value is greater than a second brightness value, a product of the first brightness value and a set proportion value is equal to the second brightness value, the set proportion value is determined according to the set time period and/or the set pixel unit, and the second brightness value is a brightness value for lighting all pixel units of the OLED display panel in the low gray scale state in the whole refresh cycle;
and controlling the OLED display panel to display by adopting the first lighting rule.
2. The method of claim 1, wherein the first lighting rule is:
lighting all pixel units of the OLED display panel by using the first brightness value in a set time period in each refreshing period; wherein the set time period is less than a refresh cycle of the OLED display panel.
3. The method of claim 2, wherein the set ratio is:
and the duration of the set time period is in proportion to the total duration of the refresh cycle.
4. The method according to claim 2, wherein the set time period is composed of a plurality of set sub-time periods which do not overlap with each other, and a total duration of the plurality of set sub-time periods is equal to a duration of the set time period.
5. The method of claim 1, wherein the first lighting rule is:
lighting the set pixel unit by adopting a first brightness value in the whole refreshing period of each refreshing period; the number of the set pixel units is smaller than the number of all the pixel units in the OLED display panel.
6. The method of claim 5, wherein the set ratio is:
and the number of the set pixel units accounts for the proportion of the total number of the pixel units of the whole OLED display panel.
7. The method of claim 6, wherein the set pixel cells within the OLED display panel are determined by:
dividing the OLED display panel into a plurality of same pixel regions; the shapes of the multiple same pixel regions and the number of the included pixel units are the same;
selecting one or more pixel units as the setting pixel units in each pixel region; the number of the set pixel units in each pixel region and the positions of the set pixel units in each pixel region are the same.
8. An OLED display panel, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory to execute the method of any one of claims 1 to 7 in accordance with the obtained program.
9. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1 to 7.
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| CN111798801B (en) * | 2020-05-29 | 2022-06-24 | 厦门天马微电子有限公司 | Display panel, driving method thereof and driving circuit thereof |
| CN111833810B (en) * | 2020-07-29 | 2021-10-26 | 云谷（固安）科技有限公司 | Display panel driving method and device and display panel |
| CN113506537A (en) * | 2021-06-29 | 2021-10-15 | 上海闻泰信息技术有限公司 | Color cast correction method, color cast correction device and system of OLED display |
| WO2024000315A1 (en) * | 2022-06-29 | 2024-01-04 | 京东方科技集团股份有限公司 | Display panel drive method and apparatus, and storage medium and display device |
| CN117392937B (en) * | 2023-12-13 | 2024-03-19 | 武汉精测电子集团股份有限公司 | Color point separation and demura method, device and system for white picture of display panel |
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