CN113628575A - Brightness compensation method, brightness compensation device and brightness compensation system of display panel - Google Patents

Brightness compensation method, brightness compensation device and brightness compensation system of display panel Download PDF

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CN113628575A
CN113628575A CN202110920126.0A CN202110920126A CN113628575A CN 113628575 A CN113628575 A CN 113628575A CN 202110920126 A CN202110920126 A CN 202110920126A CN 113628575 A CN113628575 A CN 113628575A
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time
brightness
compensation coefficient
screen area
actual
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王玉青
唐韬
王峥
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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Abstract

The application provides a brightness compensation method, a brightness compensation device and a brightness compensation system of a display panel, relates to the technical field of display, and is used for solving the technical problem of color cast of an auxiliary screen area, and the brightness compensation method of the display panel comprises the following steps: acquiring at least two of the actual temperature, the actual frame rate and the actual display brightness value of the display panel and the working time of the display panel; obtaining a brightness compensation coefficient corresponding to the auxiliary screen area according to at least two of the obtained actual temperature, the actual frame rate and the actual display brightness value, the working time and the corresponding relation of the pre-stored brightness compensation coefficient along with the time; and performing brightness compensation on the auxiliary screen area according to the brightness compensation coefficient. By comprehensively considering a plurality of factors influencing the brightness attenuation, such as temperature, frame rate, display brightness value and the like, the factors are reflected in the brightness compensation coefficient, the brightness of the auxiliary screen area is comprehensively and accurately compensated, the color cast degree of the auxiliary screen area is reduced, the uniformity of the brightness of the display panel is improved, and the display effect is improved.

Description

Brightness compensation method, brightness compensation device and brightness compensation system of display panel
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a brightness compensation method, a brightness compensation apparatus, and a brightness compensation system for a display panel.
Background
With the development of display technologies, a display panel with a higher screen ratio can provide better visual experience, and gradually becomes a mainstream development direction. In order to increase the screen ratio of the display panel, a functional device such as a camera module is generally disposed below the display panel.
In the related art, the display panel includes a main screen area and an auxiliary screen area, and the auxiliary screen area is opposite to the camera module. When the camera module is used, the auxiliary screen area does not display images, so that the camera module can shoot through the auxiliary screen area; when the camera module is not used, the auxiliary screen area displays images. However, as the service time of the display panel increases, the color shift of the sub-screen area often occurs, which affects the display effect.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide a brightness compensation method, a brightness compensation apparatus, and a brightness compensation system for a display panel to improve color shift of a sub-screen area.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a first aspect of an embodiment of the present application provides a brightness compensation method for a display panel, where the display panel includes a secondary screen area and a primary screen area at least partially surrounding the secondary screen area, and the brightness compensation method for the display panel includes: acquiring at least two of an actual temperature, an actual frame rate and an actual display brightness value of a display panel and working time of the display panel; obtaining a brightness compensation coefficient corresponding to the auxiliary screen area according to at least two of the obtained actual temperature, the actual frame rate and the actual display brightness value, the working time and the corresponding relation of the pre-stored brightness compensation coefficient along with the time; and performing brightness compensation on the auxiliary screen area according to the brightness compensation coefficient.
In the brightness compensation method for the display panel provided in the embodiment of the application, the corresponding relation of the brightness compensation coefficient along with time is prestored, and according to at least two of the actual temperature, the actual frame rate and the actual display brightness value and the working time, the brightness compensation coefficient corresponding to the auxiliary screen area is obtained, the brightness compensation is performed on the auxiliary screen area, a plurality of factors influencing the brightness attenuation, such as the temperature, the frame rate, the display brightness value and the like, are comprehensively considered and embodied in the brightness compensation coefficient, the brightness of the auxiliary screen area is more comprehensively and accurately compensated, the color cast degree of the auxiliary screen area is reduced, the uniformity of the brightness of the display panel is improved, and therefore the display effect is improved.
In a possible implementation manner, the correspondence relationship between the pre-stored luminance compensation coefficients over time includes: the corresponding relation of the temperature compensation coefficient along with time, the corresponding relation of the frame rate compensation coefficient along with time and the corresponding relation of the display brightness value compensation coefficient along with time; wherein, the corresponding relation of the display brightness value compensation coefficient with time comprises: the corresponding relation of the gray scale compensation coefficient along with time and the corresponding relation of the light-emitting time compensation coefficient along with time.
In a possible implementation manner, the method for compensating brightness of a display panel further includes obtaining a correspondence relationship of the temperature compensation coefficient with time, where obtaining the correspondence relationship of the temperature compensation coefficient with time includes: acquiring brightness attenuation curves of the main screen area and the auxiliary screen area at a plurality of temperatures; acquiring a first relative attenuation curve of the auxiliary screen area at each temperature, wherein the first relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same temperature to the brightness attenuation curve of the main screen area; and determining the corresponding relation of the temperature compensation coefficients along with time according to the first relative attenuation curve, wherein the corresponding relation of the temperature compensation coefficients along with time comprises a plurality of temperatures and temperature compensation coefficients corresponding to the temperatures, and the temperature compensation coefficient corresponding to each temperature is the reciprocal value of the first relative attenuation curve at the temperature.
In a possible implementation manner, the method for compensating brightness of the display panel further includes obtaining a corresponding relationship of the frame rate compensation coefficient with time, where obtaining the corresponding relationship of the frame rate compensation coefficient with time includes: acquiring a brightness attenuation curve of the main screen area and a brightness attenuation curve of the auxiliary screen area under a plurality of frame rates; acquiring a second relative attenuation curve of the auxiliary screen area at each frame rate, wherein the second relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same frame rate to the brightness attenuation curve of the main screen area; and determining the corresponding relation of the frame rate compensation coefficients along with time according to the second relative attenuation curve, wherein the corresponding relation of the frame rate compensation coefficients along with time comprises a plurality of frame rates and frame rate compensation coefficients corresponding to the frame rates, and the frame rate compensation coefficient corresponding to each frame rate is the reciprocal value of the second relative attenuation curve at the frame rate.
In a possible implementation manner, the method for compensating luminance of a display panel further includes obtaining a correspondence relationship between the gray scale compensation coefficients over time, where obtaining the correspondence relationship between the gray scale compensation coefficients over time includes: acquiring a brightness attenuation curve of the main screen area and a brightness attenuation curve of the auxiliary screen area under a plurality of gray scales; acquiring a third relative attenuation curve of the auxiliary screen area under each gray scale, wherein the third relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same gray scale to the brightness attenuation curve of the main screen area; and determining the corresponding relation of the gray scale compensation coefficients along with time according to the third relative attenuation curve, wherein the corresponding relation of the gray scale compensation coefficients along with time comprises a plurality of gray scales and the gray scale compensation coefficients corresponding to the gray scales, and the gray scale compensation coefficient corresponding to each gray scale is the reciprocal value of the third relative attenuation curve under the gray scale.
In one possible implementation manner, the method for compensating brightness of the display panel further includes obtaining a corresponding relation of the light-emitting time compensation coefficient with time, and the obtaining the corresponding relation of the light-emitting time compensation coefficient with time includes: acquiring a brightness attenuation curve of the main screen area and a brightness attenuation curve of the auxiliary screen area under a plurality of light-emitting time duty ratios; acquiring a fourth relative attenuation curve of the auxiliary screen area under each luminous time duty ratio, wherein the fourth relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same luminous time duty ratio to the brightness attenuation curve of the main screen area; and determining a corresponding relation of the light-emitting time compensation coefficients along with time according to the fourth relative attenuation curve, wherein the corresponding relation of the light-emitting time compensation coefficients along with time comprises a plurality of light-emitting time duty ratios and light-emitting time compensation coefficients corresponding to the light-emitting time duty ratios, and the light-emitting time compensation coefficient corresponding to each light-emitting time duty ratio is a reciprocal value of the fourth relative attenuation curve under the light-emitting time duty ratio.
In one possible implementation, the actual display luminance value includes an actual gray scale and an actual light emitting time duty ratio; the step of obtaining the brightness compensation coefficient corresponding to the secondary screen area according to the corresponding relationship between the obtained actual temperature, the obtained actual frame rate and the obtained actual display brightness value, the working time and the pre-stored brightness compensation coefficient along with time comprises the following steps: searching in the corresponding relation of the temperature compensation coefficient along with the time according to the actual temperature and the working time to obtain the temperature compensation coefficient; searching in the corresponding relation of the frame rate compensation coefficient along with the time according to the actual frame rate and the working time to obtain a frame rate compensation coefficient; searching in the corresponding relation of the gray scale compensation coefficient along with the time according to the actual gray scale and the working time to obtain a gray scale compensation coefficient; searching in the corresponding relation of the light-emitting time compensation coefficient along with time according to the actual light-emitting time duty ratio and the working time to obtain a light-emitting time compensation coefficient; and calculating the brightness compensation coefficient of the auxiliary screen area according to the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient.
Preferably, the brightness compensation coefficient is a fourth root of a product of a temperature compensation coefficient, the frame rate compensation coefficient, a gray scale compensation coefficient and the light emitting time compensation coefficient.
In a possible implementation manner, the step of obtaining the brightness compensation coefficient corresponding to the secondary screen area according to the corresponding relationship between the obtained actual temperature, the obtained actual frame rate, and the obtained actual display brightness value, the obtained operating time, and the pre-stored brightness compensation coefficient over time includes: acquiring a minimum brightness value of the display panel; correcting the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio according to the minimum brightness value; and obtaining the brightness compensation coefficient of the auxiliary screen area according to the corrected working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio and the corresponding relation of the pre-stored brightness compensation coefficient along with time.
A second aspect of the embodiments of the present application provides a brightness compensation apparatus for a display panel, where the display panel includes a secondary screen area and a main screen area at least partially surrounding the secondary screen area, and the brightness compensation apparatus for the display panel includes: an obtaining module, configured to obtain at least two of an actual temperature, an actual frame rate, and an actual display brightness value of the display panel, and a working time of the display panel; the calculation module is used for obtaining a brightness compensation coefficient corresponding to the auxiliary screen area according to the corresponding relation of the obtained actual temperature, at least two of the actual frame rate and the actual display brightness value, the working time and the pre-stored brightness compensation coefficient along with time; and the compensation module is used for performing brightness compensation on the auxiliary screen area according to the brightness compensation coefficient.
In the brightness compensation device of the display panel provided by the embodiment of the application, the obtaining module can obtain at least two of the actual temperature, the actual frame rate and the actual display brightness value of the display panel and the working time of the display panel, the calculating module obtains the brightness compensation coefficient of the auxiliary screen area according to the obtained at least two of the actual temperature, the actual frame rate and the actual display brightness value, the working time and the corresponding relation of the pre-stored brightness compensation coefficient along with time, and the compensating module performs brightness compensation on the auxiliary screen area according to the brightness compensation coefficient. By comprehensively considering a plurality of factors influencing the brightness attenuation, such as temperature, frame rate, display brightness value and the like, and embodying the factors in the brightness compensation coefficient, the brightness of the auxiliary screen area is more comprehensively and accurately compensated, the color cast degree of the auxiliary screen area is reduced, the uniformity of the brightness of the display panel is improved, and the display effect of the display panel is improved.
A third aspect of embodiments of the present application provides a brightness compensation system for a display panel, including: the memory is pre-stored with the corresponding relation of the temperature compensation coefficient along with time, the corresponding relation of the frame rate compensation coefficient along with time, the corresponding relation of the gray scale compensation coefficient along with time and the corresponding relation of the light-emitting time compensation coefficient along with time; the processor is in signal connection with the memory, monitors the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the working time of the display panel, searches a temperature compensation coefficient, a frame rate compensation coefficient, a gray scale compensation coefficient and a light-emitting time compensation coefficient in the memory according to the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the working time, and calculates a brightness compensation coefficient of the auxiliary screen area according to the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient; and the controller is in signal connection with the processor and adjusts the voltage of the auxiliary screen area according to the brightness compensation coefficient so as to perform brightness compensation on the auxiliary screen area.
In the brightness compensation system of the display panel provided in the embodiment of the application, the processor searches the corresponding temperature compensation coefficient, frame rate compensation coefficient, gray scale compensation coefficient and light emitting time compensation coefficient in the memory according to the acquired actual temperature, actual frame rate, actual gray scale, actual light emitting time duty ratio and working time, and calculates the brightness compensation coefficient of the sub-screen area according to the temperature compensation coefficient, frame rate compensation coefficient, gray scale compensation coefficient and light emitting time compensation coefficient, the controller performs brightness compensation on the sub-screen area according to the brightness compensation coefficient, comprehensively considers a plurality of factors influencing brightness attenuation, such as temperature, frame rate, display brightness value and the like, and embodies the factors in the brightness compensation coefficient, so as to more comprehensively and accurately compensate the brightness of the sub-screen area, reduce the color cast degree of the sub-screen area and improve the uniformity of the brightness of the display panel, thereby improving the display effect of the display panel.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a main screen area and an auxiliary screen area in an embodiment of the present application;
FIG. 2 is a flowchart illustrating a brightness compensation method for a display panel according to an embodiment of the present disclosure;
FIG. 3 is a luminance value of a main screen area and an auxiliary screen area before compensation in an embodiment of the present application;
FIG. 4 is a luminance value of the compensated main screen area and the compensated sub-screen area in the embodiment of the present application;
FIG. 5 is a graph showing the luminance decay with time of a plurality of test points of the main screen area at 90Hz in the embodiment of the present application;
FIG. 6 is a graph showing the luminance decay with time of a plurality of test points in the sub-screen area at 90Hz in the embodiment of the present application;
FIG. 7 is a process of correcting the minimum luminance value in the embodiment of the present application;
fig. 8 is a schematic structural diagram of a brightness compensation system of a display panel in an embodiment of the present application.
Description of reference numerals:
100-a display panel; 110-a main screen area;
120-secondary screen area; 200-a brightness compensation system;
210-a memory; 220-a processor;
230-a controller.
Detailed Description
As described in the background art, the display panel in the related art has a color shift problem in the sub-screen area, and the inventor finds that the reason for the problem is that, in order to ensure the shooting effect of the camera module under the sub-screen area, the sub-screen area and the main screen area are different in material and pixel density, and the brightness attenuation degree of the main screen area and the sub-screen area is different, so that the brightness of the main screen area and the sub-screen area is obviously different with the increase of the service time of the display panel. Generally, the brightness of the sub-screen area is attenuated faster than that of the main screen area, and the sub-screen area is color-shifted relative to the main screen area.
In view of the above-mentioned drawbacks, the present application provides an improved technical solution, in which a luminance compensation coefficient corresponding to a sub-screen area is obtained according to at least two of an actual temperature, an actual frame rate, and an actual display luminance value, and an operating time of a display panel, and the sub-screen area is subjected to luminance compensation according to the luminance compensation coefficient. By comprehensively considering a plurality of factors influencing the Brightness attenuation, such as temperature, Frame Rate (Frame Rate), Display Brightness Value (DBV for short), and the like, and embodying the factors in the Brightness compensation coefficient, the Brightness of the sub-screen area is more comprehensively and accurately compensated, the color cast degree of the sub-screen area is reduced, and the uniformity of the Brightness of the Display panel is improved, thereby improving the Display effect of the Display panel.
In order to make the aforementioned objects, features and advantages of the embodiments of the present application more comprehensible, embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the present application and not all 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 application.
The embodiment of the present application provides a brightness compensation method for a display panel, and referring to fig. 1, the display panel 100 includes a main screen area 110 and a sub-screen area 120. The main screen Area 110 is generally an operable Area (AA Area), and the sub-screen Area 120 is generally an Area of the Display Panel 100 opposite to an Under-screen Camera (UDC or cpu), i.e., the Under-screen Camera is located below the sub-screen Area 120.
The primary screen area 110 is located outside the secondary screen area 120 and is adjacent to the secondary screen area 120. The main screen area 110 may partially surround the secondary screen area 120, or, as shown in fig. 1, the main screen area 110 may completely surround the secondary screen area 120, that is, the main screen area 110 circumferentially surrounds the secondary screen area 120, and the secondary screen area 120 is located inside the main screen area 110.
Referring to fig. 1 and fig. 2, a method for compensating luminance of a display panel in an embodiment of the present application may specifically include the following steps:
step S101, acquiring at least two of the actual temperature, the actual frame rate and the actual display brightness value of the display panel, and the working time of the display panel.
The actual temperature of the display panel 100 refers to the real-time temperature of the display panel 100, which may be measured by a temperature sensor in the display panel 100. Illustratively, the temperature sensor is a Thin Film Transistor (TFT), for example, the Thin Film Transistor may be an amorphous silicon (α -Si), polysilicon (poly silicon) or oxide (oxide) Transistor, and the Thin Film Transistor may be a top gate structure or a bottom gate structure. The thin film transistor increases with temperature, and the current increases, and the temperature of the display panel 100 can be obtained by detecting the current of the thin film transistor, so that the temperature sensor does not need to be additionally arranged, and the structure of the display panel 100 is simplified.
The actual frame rate of the display panel 100 is a real-time refresh frame rate of the display panel 100, that is, a physical refresh rate of the display panel 100, and specifically, a number of times of repeated scanning of the pattern, and a measurement unit of the frame rate is usually a number of display Frames Per Second (FPS), and the higher the refresh frame rate is, the better the display effect is. The actual frame rate of the display panel 100 is obtained by the refresh frame rate of the application itself located in the foreground, or obtained by the rendering system, for example, by the display composition system (Surface flicker) determining the application of the foreground, and obtaining the real-time refresh frame rate of the application.
The display brightness value of the display panel 100 may characterize the transition effect of the brightness change of the display panel 100 during the brightness adjustment process, i.e. whether the brightness change transition is smooth during the brightness adjustment process. For example, when the brightness of the display panel 100 is automatically adjusted by the photosensitive assembly, or when the brightness is adjusted according to a manual instruction of a user (for example, pulling a brightness bar), the brightness of the display panel 100 changes. The display brightness value may be a 51-register output value.
The display brightness value of the display panel 100 is related to the gray scale of the display panel 100 and the duty ratio of the light emitting time, the gray scale of the display panel 100 corresponds to a gray scale picture of the display panel 100, the gray scale picture can be collected by a Charge Coupled Device (CCD) or other optical devices, and is transmitted to the processor 220 through wired transmission or wireless transmission, and then the processor 220 performs graphic processing to obtain the actual gray scale of the display panel 100, where the actual gray scale is a real-time quantity. The light emitting time duty ratio refers to a duty ratio (duty) of light emitting time of the light emitting layer in one frame, and for example, the light emitting time of the light emitting layer is controlled by a driving circuit electrically connected to the light emitting layer, and the actual light emitting time duty ratio may be characterized by a luminance bar.
The operating time of the display panel 100 refers to an accumulated display time of the display panel 100, which may be obtained by a timer within the display panel 100. For example, the timer may be a timing transistor, when the display panel 100 is lighted, the timing transistor is turned on, the timing circuit is turned on, and the condition that the display panel 100 is lighted is obtained through the on information of the timing circuit, that is, the working time of the display panel 100 is obtained, for example, the current of the timing circuit is detected, and the current path is integrated to obtain the on information of the timing circuit. Of course, the timer may also adopt other structures, which is not limited in the embodiments of the present application.
In the embodiment of the present application, at least two of the actual temperature, the actual frame rate, and the actual display luminance value of the display panel 100 are obtained, the actual temperature, the actual frame rate, and the actual display luminance value all have an influence on the luminance attenuation of the display panel 100, any two or three of the actual temperature, the actual frame rate, and the actual display luminance value are obtained, a plurality of factors influencing the luminance attenuation can be comprehensively considered, and the luminance is compensated more comprehensively.
Step S102, obtaining a brightness compensation coefficient corresponding to the auxiliary screen area according to at least two of the obtained actual temperature, the actual frame rate and the actual display brightness value, the working time and the corresponding relation of the pre-stored brightness compensation coefficient along with time.
In the embodiment of the present application, the correspondence relationship between the luminance compensation coefficients over time includes a correspondence relationship between the temperature compensation coefficients over time, a correspondence relationship between the frame rate compensation coefficients over time, and a correspondence relationship between the display luminance value compensation coefficients over time, where the correspondence relationship between the display luminance value compensation coefficients over time may include a correspondence relationship between the gray scale compensation coefficients over time and a correspondence relationship between the emission time compensation coefficients over time.
The corresponding relation of the temperature compensation coefficients along with time comprises a plurality of temperatures and the temperature compensation coefficients corresponding to the temperatures. For example, a change value of the temperature compensation coefficient with time at 25 ℃, a change value of the temperature compensation coefficient with time at 45 ℃, a change value of the temperature compensation coefficient with time at 60 ℃ and the like. The minimum variation of the temperature may be 1 ℃, the variation value of the temperature compensation coefficient with time at some temperatures may be obtained by measurement, and the variation value of the other temperature compensation coefficients with time may be obtained by interpolation according to other temperatures.
The corresponding relation of the frame rate compensation coefficient along with time comprises a plurality of frame rates and the frame rate compensation coefficient corresponding to each frame rate. For example, the corresponding relationship of the frame rate compensation coefficient with time includes a variation value of the frame rate compensation coefficient with time at 30HZ, a variation value of the frame rate compensation coefficient with time at 60HZ, a variation value of the frame rate compensation coefficient with time at 90HZ, and the like, wherein the minimum variation of the frame rate may be 1 HZ.
The corresponding relation of the gray scale compensation coefficients along with time comprises a plurality of gray scales and the gray scale compensation coefficients corresponding to the gray scales. For example, the corresponding relationship of the gray scale compensation coefficient with time includes a change value of the gray scale compensation coefficient with time under the gray scales of 0 to 255 (8bit display panel) and each gray scale, or a change value of the gray scale compensation coefficient with time under the gray scales of 0 to 1023 (10bit display panel) and each gray scale, wherein the minimum change amount of the gray scales can be 1 gray scale, or 10 gray scales, and the like, which are selected according to the requirement of brightness compensation.
The correspondence relationship of the light emission time compensation coefficient with time includes a plurality of light emission time duty ratios and light emission time compensation coefficients corresponding to the respective light emission time duty ratios. For example, the correspondence relationship of the light emission time compensation coefficient with time includes a change value of the light emission time compensation coefficient with time at 25%, a change value of the light emission time compensation coefficient with time at 50%, and the like, wherein the minimum change amount of the light emission time duty ratio may be 5%.
The pre-stored correspondence of the luminance compensation coefficients with time may include at least two of the four sets of correspondence, and the types of correspondence included therein may correspond to at least two of the acquired actual temperature, the actual frame rate, and the actual display luminance value.
It can be understood that, when the actual temperature and the actual frame rate are obtained, the pre-stored correspondence relationship of the brightness compensation coefficient with time includes a correspondence relationship of the temperature compensation coefficient with time and a correspondence relationship of the frame rate compensation coefficient with time; when the actual temperature, the actual frame rate and the actual gray scale are obtained, the pre-stored corresponding relationship of the brightness compensation coefficient with time comprises the corresponding relationship of the temperature compensation coefficient with time, the corresponding relationship of the frame rate compensation coefficient with time and the corresponding relationship of the gray scale compensation coefficient with time.
It should be noted that the brightness compensation coefficient may be burned into a Flash Memory (Flash Memory, abbreviated as Flash), and the Flash Memory is used as a Non-Volatile (Non-Volatile) Memory, and can maintain data for a long time even without current supply, so as to perform brightness compensation even in case of power failure. The flash memory may be, for example, a charged Erasable Programmable read only memory (EEPROM), a NAND flash memory, a NOR flash memory, or the like.
In some possible examples, the correspondence relationship between the temperature compensation coefficient and the time, the correspondence relationship between the frame rate compensation coefficient and the time, the correspondence relationship between the gray scale compensation coefficient and the correspondence relationship between the light-emitting time compensation coefficient and the time are all burned in the flash memory, and by the arrangement, any two of the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio can be obtained and can be correspondingly searched in the flash memory, so that the flexibility of the brightness compensation is improved.
In some possible examples of the present application, the step of obtaining the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio, and the operating time of the display panel 100, and accordingly obtaining the luminance compensation coefficient corresponding to the sub-screen according to at least two of the obtained actual temperature, the actual frame rate, and the actual display luminance value, the operating time, and the corresponding relationship of the pre-stored luminance compensation coefficient with time may include:
according to the actual temperature and the working time, searching in the corresponding relation of the temperature compensation coefficient along with the time to obtain a temperature compensation coefficient (Gain 1);
according to the actual frame rate and the working time, searching in the corresponding relation of the frame rate compensation coefficient along with the time to obtain a frame rate compensation coefficient (Gain 2);
according to the actual gray scale and the working time, searching in the corresponding relation of the gray scale compensation coefficient along with the time to obtain a gray scale compensation coefficient (Gain 3);
searching in the corresponding relation of the light-emitting time compensation coefficient along with the time according to the actual light-emitting time duty ratio and the working time to obtain a light-emitting time compensation coefficient (Gain 4);
and calculating to obtain the brightness compensation coefficient of the auxiliary screen area through the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient.
The process of obtaining the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light emitting time compensation coefficient is not limited in sequence, and the four coefficients can be obtained sequentially or simultaneously according to needs. The luminance compensation coefficient (Gain) is a fourth root of a product of the temperature compensation coefficient, the frame rate compensation coefficient, the gray-scale compensation coefficient, and the light-emitting time compensation coefficient, that is, the luminance compensation coefficient (Gain) can be obtained by the following formula:
Figure BDA0003207079670000101
of course, the brightness compensation coefficient and the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient, and the light emitting time compensation coefficient may have other calculation formulas, which are not limited herein.
And S103, performing brightness compensation on the auxiliary screen area according to the brightness compensation coefficient.
In some possible embodiments, the voltage of the sub-screen 120, for example, a Gamma voltage (Gamma), is adjusted according to the brightness compensation coefficient, and the brightness compensation is performed on the sub-screen 120, so as to reduce the brightness difference between the main screen 110 and the sub-screen 120, so that the brightness difference between the main screen 110 and the sub-screen 120 is smaller than a preset value, for example, the ratio of the brightness of the sub-screen 120 to the brightness of the main screen 110 is between 90% and 110%, so as to improve the display effect of the display panel 100.
Referring to fig. 3 and 4, when the operating time of the display panel 100 is 0, the luminance of the main screen area 110 is equal to the luminance of the sub screen area 120, as shown in fig. 3, the luminance of the main screen area 110 is 400nits (nits), the luminance of the sub screen area 120 is 400nits, and the luminance compensation coefficient is close to 1. When the operation time of the display panel 100 is T1, if the brightness compensation is not performed, the brightness of the main screen area 110 is 200nits, the brightness of the sub-screen area 120 is 160nits, and the brightness of the main screen area 110 and the brightness of the sub-screen area 120 are significantly different. According to the brightness compensation method in the embodiment of the present application, the working time is T1, the brightness compensation coefficient of the sub-screen area 120 is 1.25, at this time, the brightness compensation coefficient is multiplied by the brightness of the sub-screen area 120, and the brightness of the compensated sub-screen area 120 is 200nits (160nit × 1.25), so that the difference between the brightness of the main screen area 110 and the brightness of the sub-screen area 120 is reduced. Of course, the brightness compensation coefficient of the sub-screen area 120 may also be the brightness variation of the sub-screen area 120, that is, the brightness compensation coefficient is added to the brightness of the sub-screen area 120.
In the brightness compensation method for the display panel provided in the embodiment of the application, the corresponding relationship of the brightness compensation coefficient with time is pre-stored, and the brightness compensation coefficient corresponding to the auxiliary screen area 120 is obtained according to at least two of the actual temperature, the actual frame rate and the actual display brightness value, and the working time, so as to perform brightness compensation on the auxiliary screen area 120, comprehensively consider a plurality of factors affecting brightness attenuation, such as temperature, frame rate, display brightness value and the like, and embody the factors in the brightness compensation coefficient, more comprehensively and accurately compensate the brightness of the auxiliary screen area 120, reduce the color cast degree of the auxiliary screen area 120, improve the uniformity of the brightness of the display panel 100, and further improve the display effect.
On the basis of the foregoing embodiment, in one possible implementation manner of the present application, the method for compensating luminance of a display panel further includes obtaining a corresponding relationship of the temperature compensation coefficient with time, where obtaining the corresponding relationship of the temperature compensation coefficient with time includes:
and acquiring the brightness attenuation curve of the main screen area and the brightness attenuation curve of the auxiliary screen area at a plurality of temperatures. For example, when the temperature is 25 ℃, a luminance decay curve of the luminance of the plurality of test points of the main screen area 110 with time and a luminance decay curve of the plurality of test points of the sub screen area 120 with time are obtained, the luminance decay curve of the main screen area 110 is obtained by fitting the luminance decay curves of the plurality of test points of the main screen area 110 with time, and the luminance decay curve of the sub screen area 120 is obtained by fitting the luminance decay curves of the plurality of test points of the sub screen area 120 with time. Similarly, the brightness decay curve of the main screen area 110 at other temperatures and the brightness decay curve of the sub-screen area 120 are obtained.
And acquiring a first relative attenuation curve of the auxiliary screen area at each temperature, wherein the first relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same temperature to the brightness attenuation curve of the main screen area. Illustratively, the first relative attenuation curve of the sub-screen area 120 at 25 ℃ is a ratio of the brightness attenuation curve of the sub-screen area 120 at 25 ℃ to the brightness attenuation curve of the main screen area 110 at 25 ℃. Similarly, first relative attenuation curves for the secondary screen area 120 at other temperatures are obtained.
And determining the corresponding relation of the temperature compensation coefficients along with time according to the first relative attenuation curve, wherein the corresponding relation of the temperature compensation coefficients along with time comprises a plurality of temperatures and the temperature compensation coefficients corresponding to the temperatures, and the temperature compensation coefficient corresponding to each temperature is the reciprocal value of the first relative attenuation curve at the temperature. Illustratively, the temperature compensation coefficient at 25 ℃ is the reciprocal value of the first relative attenuation curve of the secondary screen area 120 at 25 ℃. Similarly, temperature compensation coefficients at other temperatures are obtained. The plurality of temperatures and the temperature compensation coefficients corresponding to the temperatures form a corresponding relation of the temperature compensation coefficients with time.
On the basis of the foregoing embodiment, in another possible implementation manner of the present application, the method for compensating luminance of a display panel further includes obtaining a corresponding relationship of a frame rate compensation coefficient with time, where obtaining the corresponding relationship of the frame rate compensation coefficient with time includes:
the brightness attenuation curve of the main screen area and the brightness attenuation curve of the auxiliary screen area 120 at multiple frame rates are obtained. For example, as shown in fig. 5 and fig. 6, when the refresh frame rate is 90Hz, obtaining a luminance decay curve of the luminance of the plurality of test points of the main screen area 110 with time and a luminance decay curve of the luminance of the plurality of test points of the sub screen area 120 with time, obtaining a luminance decay curve of the main screen area 110 by fitting the luminance decay curves of the plurality of test points of the main screen area 110 with time, and obtaining a luminance decay curve of the sub screen area 120 by fitting the luminance decay curves of the plurality of test points of the sub screen area 120 with time. Similarly, the brightness attenuation curve of the main screen area 110 and the brightness attenuation curve of the sub-screen area 120 at other frame rates are obtained.
And acquiring a second relative attenuation curve of the auxiliary screen area at each frame rate, wherein the second relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same frame rate to the brightness attenuation curve of the main screen area. Illustratively, the second relative attenuation curve of the secondary screen area 120 at 90Hz is the ratio of the brightness attenuation curve of the secondary screen area 120 at 60Hz to the brightness attenuation curve of the primary screen area 110 at 60 Hz. Similarly, second relative attenuation curves for the secondary screen area 120 at other frame rates are obtained.
And determining the corresponding relation of the frame rate compensation coefficients along with time according to the second relative attenuation curve, wherein the corresponding relation of the frame rate compensation coefficients along with time comprises a plurality of frame rates and frame rate compensation coefficients corresponding to the frame rates, and the frame rate compensation coefficient corresponding to each frame rate is the reciprocal value of the second relative attenuation curve at the frame rate. Illustratively, the frame rate compensation factor at 60Hz is the reciprocal of the second relative attenuation curve for the secondary screen 120 at 90 Hz. Similarly, frame rate compensation coefficients at other frame rates are obtained. The frame rate compensation coefficients corresponding to the plurality of frame rates and the frame rates form a corresponding relation of the frame rate compensation coefficients along with time.
In another possible implementation manner of the present application, the method for compensating luminance of a display panel further includes obtaining a corresponding relationship of the gray-scale compensation coefficients with time, where obtaining the corresponding relationship of the gray-scale compensation coefficients with time includes:
and acquiring the brightness attenuation curve of the main screen area and the brightness attenuation curve of the auxiliary screen area under a plurality of gray scales. For example, when the gray scale is 255, obtaining a luminance decay curve of the plurality of test points of the main screen area 110 with time and a luminance decay curve of the plurality of test points of the sub screen area 120 with time, obtaining a luminance decay curve of the main screen area 110 by fitting the luminance decay curves of the plurality of test points of the main screen area 110 with time, and obtaining a luminance decay curve of the sub screen area 120 by fitting the luminance decay curves of the plurality of test points of the sub screen area 120 with time. Similarly, the brightness decay curve of the main screen area 110 at other gray scales and the brightness decay curve of the sub-screen area 120 are obtained.
And acquiring a third relative attenuation curve of the auxiliary screen area under each gray scale, wherein the third relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same gray scale to the brightness attenuation curve of the main screen area. For example, the third relative attenuation curve of the sub-screen 120 at a gray scale of 255 is a ratio of the luminance attenuation curve of the sub-screen 120 at a gray scale of 255 to the luminance attenuation curve of the main screen 110 at a gray scale of 255. Similarly, a third relative attenuation curve for the secondary screen area 120 at other gray levels is obtained.
And determining the corresponding relation of the gray scale compensation coefficients along with time according to the third relative attenuation curve, wherein the corresponding relation of the gray scale compensation coefficients along with time comprises a plurality of gray scales and the gray scale compensation coefficients corresponding to the gray scales, and the gray scale compensation coefficient corresponding to each gray scale is the reciprocal value of the third relative attenuation curve under the gray scale. Illustratively, the gray scale compensation coefficient at the gray scale of 255 is the reciprocal value of the third relative attenuation curve of the sub-screen area 120 at the gray scale of 255. Similarly, the gray scale compensation coefficients at other gray scales are obtained. The gray scale compensation coefficients corresponding to the plurality of gray scales and each gray scale form a corresponding relation of the gray scale compensation coefficients along with time.
On the basis of the foregoing embodiment, in yet another possible implementation manner of the present application, the method for compensating luminance of a display panel further includes obtaining a correspondence relationship of a light-emitting time compensation coefficient with time, and obtaining the correspondence relationship of the light-emitting time compensation coefficient with time includes:
and acquiring the brightness attenuation curve of the main screen area and the brightness attenuation curve of the auxiliary screen area under the multiple light-emitting time duty ratios. For example, when the light-emitting time duty ratio is 25%, obtaining a luminance decay curve of the luminance of the plurality of test points of the main screen area 110 with time and a luminance decay curve of the luminance of the plurality of test points of the sub screen area 120 with time, obtaining a luminance decay curve of the main screen area 110 by fitting the luminance decay curves of the plurality of test points of the main screen area 110 with time, and obtaining a luminance decay curve of the sub screen area 120 by fitting the luminance decay curves of the plurality of test points of the sub screen area 120 with time. Similarly, the brightness decay curve of the main screen area 110 and the brightness decay curve of the auxiliary screen area 120 under other light-emitting time duty ratios are obtained.
And acquiring a fourth relative attenuation curve of the auxiliary screen area under each light-emitting time duty ratio, wherein the fourth relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same light-emitting time duty ratio to the brightness attenuation curve of the main screen area. Illustratively, the fourth relative attenuation curve of the sub-screen area 120 at a light emitting time duty ratio of 25% is a ratio of the brightness attenuation curve of the sub-screen area 120 at 25% to the brightness attenuation curve of the main screen area 110 at 25%. Similarly, fourth relative decay curves for the secondary screen 120 at other light emission time duty cycles are obtained.
And determining the corresponding relation of the light-emitting time compensation coefficients along with time according to the fourth relative attenuation curve, wherein the corresponding relation of the light-emitting time compensation coefficients along with time comprises a plurality of light-emitting time duty ratios and light-emitting time compensation coefficients corresponding to the light-emitting time duty ratios, and the light-emitting time compensation coefficient corresponding to each light-emitting time duty ratio is the reciprocal value of the fourth relative attenuation curve under the light-emitting time duty ratio. Illustratively, the light emission time compensation factor at 25% is the reciprocal value of the fourth relative attenuation curve of the sub-screen area 120 at 25%. Similarly, light emission time compensation coefficients at other light emission time duty ratios are obtained. The plurality of light-emitting time duty ratios and the light-emitting time compensation coefficients corresponding to the light-emitting time duty ratios form a corresponding relation of the light-emitting time compensation coefficients with time.
In the brightness compensation of the display panel according to the embodiment of the present application, in some possible implementation manners, the step of obtaining the brightness compensation coefficient corresponding to the sub-screen area according to the correspondence between the obtained actual temperature, the obtained actual frame rate, and the obtained actual display brightness value, the obtained operating time, and the pre-stored brightness compensation coefficient with time includes:
the minimum brightness value of the display panel is acquired. The minimum brightness value may be measured by a brightness detection means, such as an optical instrument.
And correcting the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio according to the minimum brightness value. Illustratively, the operation time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio are corrected by measuring the variation of the minimum brightness value, for example, the variation of the minimum brightness value is 0.1nit, the variation of the corresponding operation time is 0.1 μ s, the variation of the actual temperature is 0.1 ℃, the variation of the actual frame rate is 1Hz, the variation of the actual gray scale is 1, and the actual light-emitting time duty ratio is 1 grid of the brightness bar.
The duty ratio of the operating time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time is usually smaller than the actually measured variation of the operating time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio, for example, the variation of the operating time measured by the timer is 1s, and the variation of the actual temperature measured by the temperature sensor is 1 ℃. The variation of the minimum brightness value is corresponding to the variation of the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio, and then the variation is superposed on the actually measured working time, actual temperature, actual frame rate, actual gray scale and actual light-emitting time duty ratio to obtain the corrected working time, actual temperature, actual frame rate, actual gray scale and actual light-emitting time duty ratio. For example, when the temperature sensor measures that the actual temperature is 25 ℃, the variation of the minimum brightness value is 0.5nit, the variation of the corresponding actual temperature is 0.5 ℃, and the variation is superimposed on the actual temperature to obtain the corrected actual temperature of 25.5 ℃.
And obtaining the brightness compensation coefficient of the auxiliary screen area according to the corrected working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio and the corresponding relation of the pre-stored brightness compensation coefficient along with time. By the minimum brightness value to the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio, the precision of the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio can be improved, the actual brightness of the display panel 100 is considered in the brightness compensation process, and the comprehensiveness and the accuracy of the brightness compensation are further improved.
As shown in fig. 7, in some possible embodiments, the process of correcting the minimum brightness value may specifically include the following processes:
inputting working time, actual temperature, actual frame rate, actual gray scale and actual light-emitting time duty ratio, monitoring minimum brightness value of a display panel, correcting the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio according to the minimum brightness value, compressing and transmitting corrected data to a Static Random Access Memory (SRAM), caching the corresponding relation of the brightness in a flash Memory along with time, compressing the corresponding relation of the brightness along with time to obtain a compensation coefficient, and outputting the compensation coefficient.
The embodiment of the present application further provides a brightness compensation apparatus for a display panel, where the display panel 100 includes a sub-screen area 120 and a main screen area 110 at least partially surrounding the sub-screen area 120, and the brightness compensation apparatus for the display panel includes:
and an obtaining module, configured to obtain at least two of an actual temperature, an actual frame rate, and an actual display brightness value of the display panel 100, and an operating time of the display panel 100.
And the calculating module is used for obtaining the brightness compensation coefficient corresponding to the auxiliary screen area 120 according to the corresponding relation of the obtained actual temperature, the obtained actual frame rate, the obtained actual display brightness value, the obtained working time and the pre-stored brightness compensation coefficient along with time.
And the compensation module is used for performing brightness compensation on the auxiliary screen area 120 according to the brightness compensation coefficient.
In the brightness compensation apparatus for a display panel provided in the embodiment of the application, the obtaining module may obtain at least two of an actual temperature, an actual frame rate, and an actual display brightness value of the display panel 100, and a working time of the display panel 100, the calculating module obtains a brightness compensation coefficient of the sub-screen area 120 according to at least two of the obtained actual temperature, the obtained actual frame rate, and the obtained actual display brightness value, the working time, and a correspondence relationship between a pre-stored brightness compensation coefficient and time, and the compensating module performs brightness compensation on the sub-screen area 120 according to the brightness compensation coefficient. By comprehensively considering a plurality of factors, such as temperature, frame rate, display brightness value, etc., which affect the brightness attenuation and embodying them in the brightness compensation coefficient, the brightness of the sub-screen area 120 is more comprehensively and accurately compensated, the color cast degree of the sub-screen area 120 is reduced, and the uniformity of the brightness of the display panel 100 is improved, thereby improving the display effect of the display panel 100.
The embodiment of the present application further provides a brightness compensation system 200 of a display panel, as shown in fig. 8, the brightness compensation system 200 includes:
the memory 210 is pre-stored with the corresponding relationship of the temperature compensation coefficient with time, the corresponding relationship of the frame rate compensation coefficient with time, the corresponding relationship of the gray scale compensation coefficient with time and the corresponding relationship of the light-emitting time compensation coefficient with time in the memory 210.
The memory 210 in the embodiment of the present application may be a flash memory, such as a eeprom 210, a NAND flash memory, or a NOR flash memory. The flash memory can maintain data for a long time even without current supply, so that the brightness compensation can be performed even in case of power failure, thereby providing reliability of the brightness compensation system 200.
And the processor 220 is in signal connection with the memory 210, the processor 220 monitors the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the working time of the display panel 100, searches the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient in the memory 210 according to the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the working time, and calculates the brightness compensation coefficient of the secondary screen area 120 according to the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient.
For example, the processor 220 monitors the operating time of the display panel 100 through a timer, monitors the actual temperature of the display panel 100 through a temperature sensor, monitors the actual frame rate of the display panel 100 through a display composition system, monitors the gray scale of the display panel 100 through processing a gray scale picture, and monitors the actual light emitting time duty ratio of the display panel 100 through a brightness bar. It is understood that the processor 220 may be a Central Processing Unit (CPU) 220, and the processor 220 directly or indirectly obtains the parameters of the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the operating time.
The processor 220 further searches the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient, and the light emitting time compensation coefficient in the memory 210 according to the actual temperature, the actual frame rate, the actual gray scale, the actual light emitting time duty ratio, and the operating time, and calculates the luminance compensation coefficient of the sub-screen area 120 according to the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient, and the light emitting time compensation coefficient. For example, the luminance compensation coefficient is a fourth root of a product of the temperature compensation coefficient, the frame rate compensation coefficient, the gray-scale compensation coefficient, and the light-emitting time compensation coefficient.
And the controller 230, wherein the controller 230 is in signal connection with the processor 220, and the controller 230 adjusts the voltage of the sub-screen area 120 according to the brightness compensation coefficient to perform brightness compensation on the sub-screen area 120. The controller 230 obtains the brightness compensation coefficient in the processor 220, and adjusts the voltage of the sub-screen 120 according to the brightness compensation coefficient, so that the difference between the brightness of the sub-screen 120 and the brightness of the main screen 110 is smaller than a preset value, for example, the ratio of the brightness of the sub-screen 120 to the brightness of the main screen 110 is between 90% and 110%, so as to improve the display effect of the display panel 100.
In the brightness compensation system 200 of the display panel provided in the embodiment of the present application, the processor 220 searches the corresponding temperature compensation coefficient, frame rate compensation coefficient, gray scale compensation coefficient, and light emitting time compensation coefficient in the memory 210 according to the obtained actual temperature, actual frame rate, actual gray scale, actual light emitting time duty ratio, and working time, and calculates the brightness compensation coefficient of the sub-screen area 120 according to the temperature compensation coefficient, frame rate compensation coefficient, gray scale compensation coefficient, and light emitting time compensation coefficient, the controller 230 performs brightness compensation on the sub-screen area 120 according to the brightness compensation coefficient, and comprehensively considers a plurality of factors affecting brightness attenuation, such as temperature, frame rate, display brightness value, etc., and embodies them in the brightness compensation coefficient, so as to more comprehensively and accurately compensate the brightness of the sub-screen area 120, reduce the color cast degree of the sub-screen area 120, and improve the uniformity of the brightness of the display panel 100, thereby improving the display effect of the display panel 100.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
In general, terms should be understood at least in part by their use in context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending, at least in part, on the context. Similarly, terms such as "a" or "the" may also be understood to convey a singular use or to convey a plural use, depending at least in part on the context.
It should be readily understood that "on … …", "above … …" and "above … …" in this disclosure should be interpreted in its broadest sense such that "on … …" means not only "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above … …" or "above … …" includes not only the meaning of "above something" or "above" but also includes the meaning of "above something" or "above" with no intervening features or layers therebetween (i.e., directly on something).
Furthermore, spatially relative terms, such as "below," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's illustrated relationship to another element or feature. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly as well.
The term "substrate" as used herein refers to a material on which a subsequent layer of material is added. The substrate itself may be patterned. The material added atop the substrate may be patterned or may remain unpatterned. In addition, the substrate may comprise a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, and the like. Alternatively, the substrate may be made of a non-conductive material (e.g., glass, plastic, or sapphire wafer, etc.).
The term "layer" as used herein may refer to a portion of material that includes a region having a thickness. A layer may extend over the entire underlying or overlying structure or may have a smaller extent than the underlying or overlying structure. Furthermore, a layer may be a region of a continuous structure, homogeneous or heterogeneous, having a thickness less than the thickness of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure or between any pair of lateral planes at the top and bottom surfaces. The layers may extend laterally, vertically and/or along the tapered surfaces. The substrate may be a layer, may include one or more layers therein, and/or may have one or more layers located thereon, above and/or below. The layer may comprise a plurality of layers. For example, the interconnect layer may include one or more conductors and contact layers (within which contacts, interconnect lines, and/or vias are formed) and one or more dielectric layers.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A method for compensating brightness of a display panel, wherein the display panel comprises a sub-screen area and a main screen area at least partially surrounding the sub-screen area, the method comprising:
acquiring at least two of an actual temperature, an actual frame rate and an actual display brightness value of the display panel, and working time of the display panel;
obtaining a brightness compensation coefficient corresponding to the auxiliary screen area according to the corresponding relation among the obtained actual temperature, the actual frame rate, the actual display brightness value, the working time and the pre-stored brightness compensation coefficient along with time;
and performing brightness compensation on the auxiliary screen area according to the brightness compensation coefficient.
2. The method of claim 1, wherein the pre-stored luminance compensation coefficients are associated with time by: the corresponding relation of the temperature compensation coefficient along with time, the corresponding relation of the frame rate compensation coefficient along with time and the corresponding relation of the display brightness value compensation coefficient along with time;
wherein, the corresponding relation of the display brightness value compensation coefficient with time comprises: the corresponding relation of the gray scale compensation coefficient along with time and the corresponding relation of the light-emitting time compensation coefficient along with time.
3. The method of claim 2, further comprising obtaining a time correspondence of the temperature compensation coefficients, wherein the obtaining the time correspondence of the temperature compensation coefficients comprises:
acquiring brightness attenuation curves of the main screen area and the auxiliary screen area at a plurality of temperatures;
acquiring a first relative attenuation curve of the auxiliary screen area at each temperature, wherein the first relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same temperature to the brightness attenuation curve of the main screen area;
and determining the corresponding relation of the temperature compensation coefficients along with time according to the first relative attenuation curve, wherein the corresponding relation of the temperature compensation coefficients along with time comprises a plurality of temperatures and temperature compensation coefficients corresponding to the temperatures, and the temperature compensation coefficient corresponding to each temperature is the reciprocal value of the first relative attenuation curve at the temperature.
4. The method of claim 2, further comprising obtaining the frame rate compensation coefficient over time, wherein obtaining the frame rate compensation coefficient over time comprises:
acquiring a brightness attenuation curve of the main screen area and a brightness attenuation curve of the auxiliary screen area under a plurality of frame rates;
acquiring a second relative attenuation curve of the auxiliary screen area at each frame rate, wherein the second relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same frame rate to the brightness attenuation curve of the main screen area;
and determining the corresponding relation of the frame rate compensation coefficients along with time according to the second relative attenuation curve, wherein the corresponding relation of the frame rate compensation coefficients along with time comprises a plurality of frame rates and frame rate compensation coefficients corresponding to the frame rates, and the frame rate compensation coefficient corresponding to each frame rate is the reciprocal value of the second relative attenuation curve at the frame rate.
5. The method of claim 2, further comprising obtaining a time correspondence between the gray scale compensation coefficients, wherein the obtaining the time correspondence between the gray scale compensation coefficients comprises:
acquiring a brightness attenuation curve of the main screen area and a brightness attenuation curve of the auxiliary screen area under a plurality of gray scales;
acquiring a third relative attenuation curve of the auxiliary screen area under each gray scale, wherein the third relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same gray scale to the brightness attenuation curve of the main screen area;
and determining the corresponding relation of the gray scale compensation coefficients along with time according to the third relative attenuation curve, wherein the corresponding relation of the gray scale compensation coefficients along with time comprises a plurality of gray scales and the gray scale compensation coefficients corresponding to the gray scales, and the gray scale compensation coefficient corresponding to each gray scale is the reciprocal value of the third relative attenuation curve under the gray scale.
6. The method of claim 2, further comprising obtaining a correspondence relationship of the light emission time compensation coefficient with time, wherein the obtaining of the correspondence relationship of the light emission time compensation coefficient with time comprises:
acquiring a brightness attenuation curve of the main screen area and a brightness attenuation curve of the auxiliary screen area under a plurality of light-emitting time duty ratios;
acquiring a fourth relative attenuation curve of the auxiliary screen area under each luminous time duty ratio, wherein the fourth relative attenuation curve is the ratio of the brightness attenuation curve of the auxiliary screen area corresponding to the same luminous time duty ratio to the brightness attenuation curve of the main screen area;
and determining a corresponding relation of the light-emitting time compensation coefficients along with time according to the fourth relative attenuation curve, wherein the corresponding relation of the light-emitting time compensation coefficients along with time comprises a plurality of light-emitting time duty ratios and light-emitting time compensation coefficients corresponding to the light-emitting time duty ratios, and the light-emitting time compensation coefficient corresponding to each light-emitting time duty ratio is a reciprocal value of the fourth relative attenuation curve under the light-emitting time duty ratio.
7. The luminance compensation method of a display panel according to any one of claims 2 to 6, wherein the actual display luminance value includes an actual gray scale and an actual light emission time duty ratio;
the step of obtaining the brightness compensation coefficient corresponding to the secondary screen area according to the corresponding relationship between the obtained actual temperature, the obtained actual frame rate and the obtained actual display brightness value, the working time and the pre-stored brightness compensation coefficient along with time comprises the following steps:
searching in the corresponding relation of the temperature compensation coefficient along with the time according to the actual temperature and the working time to obtain the temperature compensation coefficient;
searching in the corresponding relation of the frame rate compensation coefficient along with the time according to the actual frame rate and the working time to obtain a frame rate compensation coefficient;
searching in the corresponding relation of the gray scale compensation coefficient along with the time according to the actual gray scale and the working time to obtain a gray scale compensation coefficient;
searching in the corresponding relation of the light-emitting time compensation coefficient along with time according to the actual light-emitting time duty ratio and the working time to obtain a light-emitting time compensation coefficient;
calculating the brightness compensation coefficient of the auxiliary screen area according to the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient;
preferably, the brightness compensation coefficient is a fourth root of a product of a temperature compensation coefficient, the frame rate compensation coefficient, a gray scale compensation coefficient and the light emitting time compensation coefficient.
8. The method according to any one of claims 2 to 6, wherein the step of obtaining the luminance compensation coefficient corresponding to the sub-screen area according to the correspondence relationship between the actual temperature, the actual frame rate, and the actual display luminance value, the operating time, and the pre-stored luminance compensation coefficient with time comprises:
acquiring a minimum brightness value of the display panel;
correcting the working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio according to the minimum brightness value;
and obtaining the brightness compensation coefficient of the auxiliary screen area according to the corrected working time, the actual temperature, the actual frame rate, the actual gray scale and the actual light-emitting time duty ratio and the corresponding relation of the pre-stored brightness compensation coefficient along with time.
9. An apparatus for compensating brightness of a display panel, the display panel comprising a sub-screen area and a main screen area at least partially surrounding the sub-screen area, the apparatus comprising:
an obtaining module, configured to obtain at least two of an actual temperature, an actual frame rate, and an actual display brightness value of the display panel, and a working time of the display panel;
the calculation module is used for obtaining a brightness compensation coefficient corresponding to the auxiliary screen area according to the corresponding relation of the obtained actual temperature, at least two of the actual frame rate and the actual display brightness value, the working time and the pre-stored brightness compensation coefficient along with time;
and the compensation module is used for performing brightness compensation on the auxiliary screen area according to the brightness compensation coefficient.
10. A system for compensating brightness of a display panel, comprising:
the memory is pre-stored with the corresponding relation of the temperature compensation coefficient along with time, the corresponding relation of the frame rate compensation coefficient along with time, the corresponding relation of the gray scale compensation coefficient along with time and the corresponding relation of the light-emitting time compensation coefficient along with time;
the processor is in signal connection with the memory, monitors the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the working time of the display panel, searches a temperature compensation coefficient, a frame rate compensation coefficient, a gray scale compensation coefficient and a light-emitting time compensation coefficient in the memory according to the actual temperature, the actual frame rate, the actual gray scale, the actual light-emitting time duty ratio and the working time, and calculates a brightness compensation coefficient of the auxiliary screen area according to the temperature compensation coefficient, the frame rate compensation coefficient, the gray scale compensation coefficient and the light-emitting time compensation coefficient;
and the controller is in signal connection with the processor and adjusts the voltage of the auxiliary screen area according to the brightness compensation coefficient so as to perform brightness compensation on the auxiliary screen area.
CN202110920126.0A 2021-08-11 2021-08-11 Brightness compensation method, brightness compensation device and brightness compensation system of display panel Pending CN113628575A (en)

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