CN111583861A - Luminance compensation method and system of OLED display device - Google Patents
Luminance compensation method and system of OLED 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
- G09G3/22—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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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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Abstract
The invention discloses a brightness compensation method and a brightness compensation system of an OLED display device, wherein the method comprises the steps of inputting an image signal to be displayed; calculating and storing the display brightness and the display time of each pixel according to the image signal to be displayed; calculating the equivalent aging time of each pixel according to the accumulated display brightness of each pixel and the accumulated display time; calculating the aging efficiency of each pixel according to the equivalent aging time of each pixel; calculating a picture brightness evaluation value according to the image signal to be displayed; calculating the brightness compensation coefficient of each pixel according to the aging efficiency of each pixel and the picture brightness evaluation value; and outputting an image after performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel. The brightness compensation coefficient of each pixel is comprehensively evaluated by combining the aging efficiency and the image brightness, so that the phenomenon of accelerated aging of the pixels caused by brightness compensation is relieved, and the aging of the OLED is delayed.
Description
Technical Field
The application relates to the technical field of display, in particular to a brightness compensation system and a brightness compensation method of an OLED display device.
Background
The OLED (Organic Light-Emitting Diode) has the advantages of low power consumption, fast response speed, wide viewing angle, capability of realizing flexible display, and the like, is widely concerned and pursued by users, and becomes a development hotspot of display technology in recent years.
For the OLED display panel, as the usage time increases, the luminous efficiency of the OLED decreases, that is, the luminance decreases under the same driving current, and at the same time, the luminance non-uniformity and the chromaticity non-uniformity are caused due to the difference of the aging degree of the OLED devices of each pixel. For this reason, brightness compensation of OLED devices by OLED aging models is one of the research directions for OLED compensation. However, brightness compensation for the OLED is to pre-support the lifetime of the OLED in advance, and cannot increase the lifetime of the OLED device fundamentally, but accelerates the aging of the device.
Disclosure of Invention
In order to solve the above problem, in a first aspect, the present invention provides a method for compensating brightness of an OLED display device, including:
inputting an image signal to be displayed;
calculating and storing the display brightness and the display time of each pixel according to the image signal to be displayed;
calculating the equivalent aging time of each pixel according to the accumulated display brightness of each pixel and the accumulated display time;
calculating the aging efficiency of each pixel according to the equivalent aging time of each pixel;
calculating a picture brightness evaluation value according to the image signal to be displayed;
calculating the brightness compensation coefficient of each pixel according to the aging efficiency of each pixel and the picture brightness evaluation value; and
and outputting an image after performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel.
Further, the step of calculating the equivalent aging time of each pixel includes: and evaluating the aging degree of each pixel according to the accumulated display brightness of each pixel and the accumulated display time of the image to be displayed, and calculating the time of each pixel when the pixels reach the same aging degree under the condition that the initial brightness is 255, namely the equivalent aging time of each pixel.
Further, the calculating of the screen brightness evaluation value includes: and calculating the average image level of the picture according to the image signal to be displayed.
Further, the step of calculating the brightness compensation coefficient of each pixel includes:
calculating a first compensation coefficient of each pixel according to the aging efficiency of each pixel;
calculating a second compensation coefficient according to the aging efficiency of each pixel and the average image level;
and multiplying the first compensation coefficient of each pixel with the second compensation coefficient of each pixel to obtain the brightness compensation coefficient of each pixel.
Further, the step of performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel includes: and calculating the compensated brightness of each pixel according to the brightness compensation coefficient of each pixel, and calculating R, G, B component values of each pixel according to the compensated brightness.
In another aspect, the present invention further provides a brightness compensation system of an OLED display device, including:
an image input unit for inputting an image signal to be displayed;
the pixel brightness calculation unit is electrically connected with the image input unit and used for acquiring an image signal to be displayed and calculating the display brightness of each pixel;
the display time calculation unit is electrically connected with the image input unit and used for acquiring an image signal to be displayed and calculating display time;
the equivalent aging time calculation unit is electrically connected with the pixel brightness calculation unit and the display time calculation unit, respectively acquires the display brightness and the display time of each pixel, transmits the display brightness and the display time to the storage unit and stores the display brightness and the display time, and acquires the accumulated display brightness and the accumulated display time of each pixel from the storage unit to calculate the equivalent aging time of each pixel;
the storage unit is electrically connected with the equivalent aging time calculation unit and is used for storing the display brightness and the display time of each pixel;
the aging efficiency calculation unit is electrically connected with the equivalent aging unit and calculates the aging efficiency of each pixel according to the equivalent aging time of each pixel;
the picture brightness calculation unit is used for acquiring the image signal to be displayed and calculating a picture brightness evaluation value;
the brightness compensation coefficient calculation unit is electrically connected with the aging efficiency calculation unit and the picture brightness calculation unit and calculates the brightness compensation coefficient of each pixel according to the aging efficiency of each pixel and the picture brightness evaluation value; and
and the image output unit is electrically connected with the brightness compensation coefficient calculation unit and is used for outputting an image after performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel.
Further, in the equivalent aging time calculation unit, the calculating of the equivalent aging time of each pixel includes: and evaluating the aging degree of each pixel according to the accumulated display brightness of each pixel and the accumulated display time of the image to be displayed, and calculating the time of each pixel when the pixels reach the same aging degree under the condition that the initial brightness is 255, namely the equivalent aging time of each pixel.
Further, in the screen luminance calculating unit, the calculating of the screen luminance evaluation value includes: and calculating the average image level of the picture according to the image signal to be displayed.
Further, in the luminance compensation coefficient calculation unit, the calculating of the luminance compensation coefficient for each pixel includes:
calculating a first compensation coefficient of each pixel according to the aging efficiency of each pixel;
calculating a second compensation coefficient according to the aging efficiency of each pixel and the average image level;
and multiplying the first compensation coefficient of each pixel with the second compensation coefficient of each pixel to obtain the brightness compensation coefficient of each pixel.
Further, in the image output unit, the step of performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel includes: and calculating the compensated brightness of each pixel according to the brightness compensation coefficient of each pixel, and calculating R, G, B component values of each pixel according to the compensated brightness.
Has the advantages that: the embodiment of the invention provides a brightness compensation method and a brightness compensation system of an OLED display device.
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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 creative efforts.
FIG. 1 is a flowchart illustrating a method for compensating brightness of an OLED display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a brightness compensation system of an OLED display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the present invention provides a method for compensating brightness of an OLED display device, and the flow of the method refers to fig. 1, which specifically includes the following steps:
and S01, inputting an image signal to be displayed.
And S02, calculating and storing the display brightness and the display time of each pixel according to the image signal to be displayed.
S03, calculating the equivalent aging time of each pixel according to the cumulatively stored display brightness of each pixel and the cumulatively stored display time,
further, the step of calculating the equivalent aging time of each pixel includes: evaluating the aging degree of each pixel according to the accumulated display brightness of each pixel and the accumulated display time of the image to be displayed, and calculating the time when each pixel is respectively displayed under the condition that the initial brightness is 255 until the aging degree is the same as each pixel, namely the equivalent aging time of each pixel, which is equivalent to accumulating the brightness corresponding to each display picture of each pixel and the display time of the picture in a micro-integration manner and calculating the accumulated brightness as the aging degree of each pixel, for example, when the accumulated display time is 1000 hours, the accumulated average brightness value is 128, the brightness of the current full white 255 is equivalent to the brightness of the initial 255 after the brightness is aged for 500 hours, and 500 hours is the equivalent aging time. It is understood that the equivalent aging time is a theoretical aging time, i.e., calculated from analysis of historical display data of each pixel, and is not an actual aging state of each pixel.
S04, calculating the aging efficiency of each pixel according to the equivalent aging time of each pixel,
usually, The calculation can be performed by The SED model (The Stretched explicit discovery method) recognized in The industry, and details thereof are not described herein.
S05, calculating the evaluation value of the image brightness according to the image signal to be displayed,
in this embodiment, the step of calculating the screen brightness evaluation value includes: and calculating the average image level of the picture according to the image signal to be displayed, namely using the average image level as a picture brightness evaluation value.
Wherein the method of calculating the average picture level generally comprises the steps of:
calculating the brightness characteristic value of each pixel;
carrying out gamma conversion on the brightness characteristic value;
and calculating the average value of the values of all the pixel brightness characteristic values after gamma change, namely the average image level.
S06, calculating the brightness compensation coefficient of each pixel according to the aging efficiency of each pixel and the screen brightness evaluation value,
in this embodiment, the step of calculating the luminance compensation coefficient of each pixel generally includes:
first, a first compensation coefficient of each pixel is calculated according to the aging efficiency of each pixel,
wherein, the first compensation coefficient is 1/aging efficiency;
and then, calculating a second compensation coefficient according to the aging efficiency of each pixel and the average image level, wherein the value of the second compensation coefficient is greater than 0 and less than or equal to 1, and the specific calculation formula is not limited in the present invention.
And multiplying the first compensation coefficient of each pixel with the second compensation coefficient of each pixel to obtain the brightness compensation coefficient of each pixel.
S07, according to the brightness compensation coefficient of each pixel, outputting the image after brightness compensation to the image signal to be displayed,
the step of performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel comprises the following steps: and calculating the compensated brightness of each pixel according to the brightness compensation coefficient of each pixel, and calculating R, G, B component values of each pixel according to the compensated brightness.
In another embodiment of the present invention, a system for compensating luminance of an OLED display device is further provided, which can implement the method for compensating luminance of the OLED display device provided in the foregoing embodiments, and the structure of the method for compensating luminance of the OLED display device provided in the foregoing embodiments includes:
an image input unit 100 for inputting an image signal to be displayed;
a pixel brightness calculating unit 200 electrically connected to the image input unit 100, configured to obtain an image signal to be displayed, and calculate display brightness of each pixel;
a display time calculation unit 300 electrically connected to the image input unit 100, configured to obtain an image signal to be displayed and calculate a display time;
an equivalent aging time calculation unit 400, electrically connected to the pixel brightness calculation unit and the display time calculation unit, for respectively obtaining the display brightness and the display time of each pixel, transmitting the display brightness and the display time to a storage unit 500, and storing the display brightness and the display time, and calculating the equivalent aging time of each pixel by obtaining the accumulated display brightness and the accumulated display time of each pixel from the storage unit 500;
a storage unit 500 electrically connected to the equivalent aging time calculation unit, capable of bidirectionally transmitting data, storing the display brightness and the display time of each pixel, and providing the stored data to the equivalent aging time calculation unit 400;
the aging efficiency calculation unit 600 is electrically connected with the equivalent aging unit and calculates the aging efficiency of each pixel according to the equivalent aging time of each pixel;
a picture brightness calculating unit 700, configured to obtain the image signal to be displayed, and calculate a picture brightness evaluation value; and
a luminance compensation coefficient calculation unit 800 electrically connected to the aging efficiency calculation unit 600 and the screen luminance calculation unit 700, for calculating a luminance compensation coefficient of each pixel according to the aging efficiency of each pixel and the screen luminance evaluation value; and
and an image output unit 900 electrically connected to the luminance compensation coefficient calculation unit 800, and configured to output the image after performing luminance compensation on the image signal to be displayed according to the luminance compensation coefficient of each pixel.
In this embodiment, in the equivalent aging time calculation unit 400, the step of calculating the equivalent aging time of each pixel includes: and evaluating the aging degree of each pixel according to the accumulated display brightness of each pixel and the accumulated display time of the image to be displayed, and calculating the time of each pixel when the pixels reach the same aging degree under the condition that the initial brightness is 255, namely the equivalent aging time of each pixel.
In this embodiment, in the screen luminance calculating unit 700, the step of calculating the screen luminance evaluation value includes: and calculating the average image level of the picture according to the image signal to be displayed.
In this embodiment, in the luminance compensation coefficient calculation unit 800, the calculating the luminance compensation coefficient of each pixel includes:
calculating a first compensation coefficient of each pixel according to the aging efficiency of each pixel;
calculating a second compensation coefficient according to the aging efficiency of each pixel and the average image level;
and multiplying the first compensation coefficient of each pixel with the second compensation coefficient of each pixel to obtain the brightness compensation coefficient of each pixel.
In this embodiment, in the image output unit 900, the step of performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel includes: and calculating the compensated brightness of each pixel according to the brightness compensation coefficient of each pixel, and calculating R, G, B component values of each pixel according to the compensated brightness.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again.
The above detailed description is provided for the brightness compensation method and the brightness compensation system of the OLED display device according to the embodiments of the present invention, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core concept of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A brightness compensation method of an OLED display device is characterized by comprising the following steps:
inputting an image signal to be displayed;
calculating and storing the display brightness and the display time of each pixel according to the image signal to be displayed;
calculating the equivalent aging time of each pixel according to the accumulated display brightness of each pixel and the accumulated display time;
calculating the aging efficiency of each pixel according to the equivalent aging time of each pixel;
calculating a picture brightness evaluation value according to the image signal to be displayed;
calculating the brightness compensation coefficient of each pixel according to the aging efficiency of each pixel and the picture brightness evaluation value; and
and outputting an image after performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel.
2. The method for compensating luminance of an OLED display device as claimed in claim 1, wherein the step of calculating the equivalent aging time of each pixel comprises: and evaluating the aging degree of each pixel according to the accumulated display brightness of each pixel and the accumulated display time of the image to be displayed, and calculating the time of each pixel when the pixels reach the same aging degree under the condition that the initial brightness is 255, namely the equivalent aging time of each pixel.
3. The method for compensating luminance of an OLED display device according to claim 1, wherein the calculating of the screen luminance evaluation value includes: and calculating the average image level of the picture according to the image signal to be displayed.
4. The method for compensating the luminance of the OLED display device as claimed in claim 1, wherein the step of calculating the luminance compensation coefficient of each pixel includes:
calculating a first compensation coefficient of each pixel according to the aging efficiency of each pixel;
calculating a second compensation coefficient according to the aging efficiency of each pixel and the average image level; and
and multiplying the first compensation coefficient of each pixel with the second compensation coefficient of each pixel to obtain the brightness compensation coefficient of each pixel.
5. The luminance compensation method of the OLED display device as claimed in claim 1, wherein the step of performing the luminance compensation on the image signal to be displayed according to the luminance compensation coefficient of each pixel includes: and calculating the compensated brightness of each pixel according to the brightness compensation coefficient of each pixel, and calculating R, G, B component values of each pixel according to the compensated brightness.
6. A system for compensating brightness of an OLED display device, comprising:
an image input unit for inputting an image signal to be displayed;
the pixel brightness calculation unit is electrically connected with the image input unit and used for acquiring an image signal to be displayed and calculating the display brightness of each pixel;
the display time calculation unit is electrically connected with the image input unit and used for acquiring an image signal to be displayed and calculating display time;
the equivalent aging time calculation unit is electrically connected with the pixel brightness calculation unit and the display time calculation unit, respectively acquires the display brightness and the display time of each pixel, transmits the display brightness and the display time to the storage unit and stores the display brightness and the display time, and acquires the accumulated display brightness and the accumulated display time of each pixel from the storage unit to calculate the equivalent aging time of each pixel;
the storage unit is electrically connected with the equivalent aging time calculation unit and is used for storing the display brightness and the display time of each pixel;
the aging efficiency calculation unit is electrically connected with the equivalent aging unit and calculates the aging efficiency of each pixel according to the equivalent aging time of each pixel;
the picture brightness calculation unit is used for acquiring the image signal to be displayed and calculating a picture brightness evaluation value;
the brightness compensation coefficient calculation unit is electrically connected with the aging efficiency calculation unit and the picture brightness calculation unit and calculates the brightness compensation coefficient of each pixel according to the aging efficiency of each pixel and the picture brightness evaluation value; and
and the image output unit is electrically connected with the brightness compensation coefficient calculation unit and is used for outputting an image after performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel.
7. The brightness compensation system of an OLED display device according to claim 6, wherein the step of calculating the equivalent aging time of each pixel in the equivalent aging time calculation unit includes: and evaluating the aging degree of each pixel according to the accumulated display brightness of each pixel and the accumulated display time of the image to be displayed, and calculating the time of each pixel when the pixels reach the same aging degree under the condition that the initial brightness is 255, namely the equivalent aging time of each pixel.
8. The luminance compensation system of the OLED display device as claimed in claim 6, wherein the step of calculating the screen luminance evaluation value in the screen luminance calculation unit includes: and calculating the average image level of the picture according to the image signal to be displayed.
9. The brightness compensation system of an OLED display device according to claim 6, wherein the step of calculating the brightness compensation coefficient of each pixel in the brightness compensation coefficient calculation unit includes:
calculating a first compensation coefficient of each pixel according to the aging efficiency of each pixel;
calculating a second compensation coefficient according to the aging efficiency of each pixel and the average image level;
and multiplying the first compensation coefficient of each pixel with the second compensation coefficient of each pixel to obtain the brightness compensation coefficient of each pixel.
10. The brightness compensation system of an OLED display device according to claim 6, wherein the step of performing brightness compensation on the image signal to be displayed according to the brightness compensation coefficient of each pixel in an image output unit includes: and calculating the compensated brightness of each pixel according to the brightness compensation coefficient of each pixel, and calculating R, G, B component values of each pixel according to the compensated brightness.
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| CN114582277A (en) * | 2022-04-19 | 2022-06-03 | 集创北方(珠海)科技有限公司 | Brightness compensation method, device, brightness compensation system, panel display device and storage medium |
| WO2024174852A1 (en) * | 2023-02-20 | 2024-08-29 | 华为技术有限公司 | Brightness control method and electronic device |
| TWI860000B (en) * | 2023-07-25 | 2024-10-21 | 大陸商集創北方（珠海）科技有限公司 | Built-in self-test circuit, display driver chip and information processing device |
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