CN113963658B - Brightness compensation method, brightness data determination method, device and chip - Google Patents
Brightness compensation method, brightness data determination method, device and chip Download PDFInfo
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- CN113963658B CN113963658B CN202010707938.2A CN202010707938A CN113963658B CN 113963658 B CN113963658 B CN 113963658B CN 202010707938 A CN202010707938 A CN 202010707938A CN 113963658 B CN113963658 B CN 113963658B
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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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- G—PHYSICS
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The application discloses a brightness compensation method, a brightness data determination method, a device and a chip, wherein the method comprises the following steps: a first sub-screen and a second sub-screen of the display screen are lightened; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted; acquiring first brightness compensation data corresponding to the first sub-screen and second brightness compensation data corresponding to the second sub-screen from preconfigured data; and carrying out brightness compensation on the first sub-screen according to the first brightness compensation data, and carrying out brightness compensation on the second sub-screen according to the second brightness compensation data.
Description
Technical Field
The embodiments of the present application relate to display technology, and relate to, but are not limited to, a brightness compensation method, a brightness data determination method, a device, and a chip.
Background
The full screen is a wider definition of ultra-high screen duty ratio design in the terminal industry such as mobile phones. The full-screen terminal is widely focused on because it has a high color value, a high-grade feeling of science and technology, and a larger display area. The full screen display technology is to hide or lift or place the front camera in a side-to-side mode, so as to realize full screen display on the front face of the terminal.
In the existing conceptual design, as shown in fig. 1, the display screen 10 is divided into a main screen area 101 and a sub-screen area 102, the sub-screen area 102 (generally, at the position of the front camera) is designed to be displayed with low pixel density (PPI), so that the transparency is increased, the camera module is embedded under the area 102, and the main screen area 102 is a normal display area, thereby realizing the design of the whole screen.
However, such a full-screen has a phenomenon of uneven brightness, i.e., mura phenomenon, at the time of display. The existing brightness compensation technology still cannot better improve the phenomenon after brightness compensation is performed on the display screen, and particularly, obvious mura stripes still exist in the auxiliary screen area.
Disclosure of Invention
In view of this, the brightness compensation method, the brightness data determination method, the device and the chip provided by the embodiments of the present application can better improve the mura phenomenon of the overall screen, especially the mura phenomenon of the sub-screen area. The brightness compensation method and the brightness data determination method, the device, the equipment and the medium are realized in the following way:
the brightness compensation method provided by the embodiment of the application comprises the following steps: a first sub-screen and a second sub-screen of the display screen are lightened; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted; acquiring first brightness compensation data corresponding to the first sub-screen and second brightness compensation data corresponding to the second sub-screen from preconfigured data; and carrying out brightness compensation on the first sub-screen according to the first brightness compensation data, and carrying out brightness compensation on the second sub-screen according to the second brightness compensation data so as to improve the uneven brightness phenomenon of the first sub-screen and the second sub-screen.
The method for determining brightness compensation data provided by the embodiment of the application comprises the following steps: at a specific gray level, a first sub-screen of the display screen is lightened; illuminating a second sub-screen of the display screen at another gray level different from the particular gray level; the first sub-screen is positioned above the front camera, and the light transmittance of the first sub-screen is larger than that of the second sub-screen; determining brightness measurement values of pixel points of the first sub-screen and the second sub-screen; determining corresponding first brightness compensation data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale; and determining corresponding second brightness compensation data according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale.
The brightness compensation device provided in the embodiment of the application includes: the lighting module is used for lighting the first sub-screen and the second sub-screen of the display screen; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted; the acquisition module is used for acquiring first brightness compensation data corresponding to the first sub-screen and second brightness compensation data corresponding to the second sub-screen from preconfigured data; and the compensation module is used for carrying out brightness compensation on the first sub-screen according to the first brightness compensation data and carrying out brightness compensation on the second sub-screen according to the second brightness compensation data so as to improve the brightness non-uniformity phenomenon of the first sub-screen and the second sub-screen.
The device for determining brightness compensation data provided by the embodiment of the application comprises: the lighting module is used for lighting the first sub-screen of the display screen under a specific gray level; illuminating a second sub-screen of the display screen at another gray level different from the particular gray level; the first sub-screen is positioned above the front camera, and the light transmittance of the first sub-screen is larger than that of the second sub-screen; the determining module is used for determining brightness measurement values of pixel points of the first sub-screen and the second sub-screen; determining corresponding first brightness compensation data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale; and determining corresponding second brightness compensation data according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale.
In the embodiment of the application, a brightness compensation method is provided, in the method, an electronic device lights a comprehensive screen with an under-screen camera, and first brightness compensation data corresponding to a first sub-screen and second brightness compensation data corresponding to a second sub-screen are obtained from preconfigured data; performing brightness compensation on the first sub-screen according to the first brightness compensation data, and performing brightness compensation on the second sub-screen according to the second brightness compensation data; therefore, the first sub-screen and the second sub-screen are subjected to targeted brightness compensation, and the problem of non-uniformity of the brightness of the first sub-screen can be better improved on the premise of correcting the non-uniformity of the brightness of the second sub-screen.
Drawings
FIG. 1 is a schematic view of a full screen;
FIG. 2 is a schematic diagram of an implementation flow of a brightness compensation method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a brightness compensation (Demura) line flow;
fig. 4 is a schematic implementation flow chart of a method for determining brightness compensation data according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an implementation flow of a method for determining a sample compensation value according to an embodiment of the present disclosure;
FIG. 6A is a schematic diagram of an implementation flow of a brightness compensation method according to an embodiment of the present application;
FIG. 6B is a flowchart illustrating an implementation of a method for eliminating a luminance difference between a first sub-screen and a second sub-screen according to an embodiment of the present disclosure;
FIG. 7 is a schematic view of a full screen according to an embodiment of the present application;
FIG. 8 is another schematic view of a full screen according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a stacked structure of a display screen according to an embodiment of the present disclosure;
fig. 10 is a schematic view of a pixel structure of an organic light emitting diode (Organic Light Emitting Diode, OLED) according to an embodiment of the disclosure;
FIG. 11 is a schematic diagram of a display effect of a display screen;
FIG. 12 is a schematic diagram of a conventional Demura flow;
fig. 13 is a schematic diagram of a demux flow for a secondary screen area according to an embodiment of the present application;
FIG. 14 is a schematic view showing the effect of the sub-screen area;
FIG. 15 is a schematic diagram of a brightness compensation device according to an embodiment of the present disclosure;
Fig. 16 is a schematic structural diagram of a device for determining brightness compensation data according to an embodiment of the present application;
fig. 17 is a schematic structural diagram of a driving chip according to an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
It should be noted that the term "first\second\third" in relation to the embodiments of the present application is merely to distinguish similar or different objects and does not represent a specific ordering for the objects, it being understood that the "first\second\third" may be interchanged in a specific order or sequence, where allowed, to enable the embodiments of the present application described herein to be practiced in an order other than that illustrated or described herein.
The brightness compensation method provided by the embodiment of the application can be applied to any electronic equipment with a display function, and the equipment can be a mobile terminal (such as a mobile phone, a tablet personal computer, an electronic reader and the like), a notebook computer, a desktop computer, a sliding rail screen and the like. The functions implemented by the brightness compensation method in the present application may be implemented by a processor in the electronic device calling a program code, which may of course be stored in a computer storage medium, it being seen that the electronic device comprises at least a processor and a storage medium.
Fig. 2 is a schematic flowchart of an implementation of the brightness compensation method according to the embodiment of the present application, as shown in fig. 2, the method at least includes the following steps 201 to 203:
Wherein input gray scales when the first sub-screen and the second sub-screen are lit are different when the brightness compensation data is determined.
Typically, the brightness compensation data is predetermined and preconfigured in the memory of the electronic device. For example, burned in a Flash memory (Flash ROM) of an electronic device. And when the brightness compensation data is determined, the driving currents for lighting the first sub-screen and the second sub-screen are different, that is, the input gray scale is different. Accordingly, when determining the luminance compensation data of the first sub-screen and the luminance compensation data of the second sub-screen, the reference luminance standard values are also different. Thus, more accurate brightness compensation data for each sub-screen can be obtained, and thus the mura problem of each sub-screen can be improved in a targeted manner.
And 203, performing brightness compensation on the first sub-screen according to the first brightness compensation data, and performing brightness compensation on the second sub-screen according to the second brightness compensation data so as to improve the brightness non-uniformity phenomenon of the first sub-screen and the second sub-screen.
That is, the brightness compensation is performed on the first sub-screen according to the brightness compensation data of the first sub-screen; and carrying out brightness compensation on the second sub-screen according to the brightness compensation data of the second sub-screen.
In the embodiment of the application, a brightness compensation method is provided, in the method, an electronic device lights a comprehensive screen with an under-screen camera, and first brightness compensation data corresponding to a first sub-screen and second brightness compensation data corresponding to a second sub-screen are obtained from preconfigured data; performing brightness compensation on the first sub-screen according to the first brightness compensation data, and performing brightness compensation on the second sub-screen according to the second brightness compensation data; therefore, the first sub-screen and the second sub-screen are subjected to targeted brightness compensation, and the problem of non-uniformity of the brightness of the first sub-screen can be better improved on the premise of correcting the non-uniformity of the brightness of the second sub-screen.
It should be noted that, the method for determining the brightness compensation data provided in the embodiment of the present application may be integrated in the same electronic device as the method for brightness compensation in the present application, or may be integrated in a different electronic device. When integrated in a different electronic device, for example, as shown in fig. 3, the method of determining the brightness compensation data is integrated in a personal computer (Personal Computer, PC) 31 and the brightness compensation method is integrated in a cell phone 32 having a full screen 321. When in implementation, the mobile phone 32 may control the first sub-screen 3211 of the full screen 321 to operate at a specific gray level, and simultaneously control the second sub-screen 3212 of the full screen 321 to operate at another gray level different from the specific gray level, so that the full screen 321 can display the test image; at this time, the display screen of the full screen 321 can be photographed by the high-resolution CCD camera 33; then, the PC 31 processes the photographed display screen by using the integrated determination method of the brightness compensation data, thereby generating brightness compensation data of the first sub-screen 3211 at the specific gray level and brightness compensation data of the second sub-screen 3212 at the other gray level, for example, generating a demux compensation table, compressing the data, and burning the compressed data in the Flash ROM 322 of the mobile phone 32; the cellular phone 32 invokes the brightness compensation data in the Flash ROM by using the brightness compensation method integrated in the display driving integrated circuit (Display Driver Integrated Circuit, DDIC) 323, thereby realizing brightness compensation for the first sub-screen 3211 and the second sub-screen 3212 of the full-screen 321.
If brightness compensation data under a plurality of different gray scales are required to be obtained, the comprehensive screen can be controlled to work under a plurality of groups of gray scales. For example, a first sub-screen of the full screen is controlled to operate at an A1 gray scale, and a second sub-screen is controlled to operate at a B1 gray scale, wherein A1 is different from B1, so as to determine a group of brightness compensation data; and controlling the first sub-screen of the full screen to work under the A2 gray scale and controlling the second sub-screen to work under the B2 gray scale, wherein A2 is different from B2, and determining a group of brightness compensation data.
Typically, the determination of the brightness compensation data is done in an off-line stage, and then one or more sets of brightness compensation data obtained are compressed and sent to the mobile phone 32, or burned into the Flash ROM of the mobile phone before the mobile phone leaves the factory. So that the cellular phone 32 can implement brightness compensation for the full screen by calling the pre-stored brightness compensation data each time it responds to an instruction to light the full screen.
It should be noted that the foregoing example is merely a schematic illustration of the Demura production line procedure, so as to facilitate the reader to better understand the technical solution of the embodiments of the present application, and does not constitute a limitation on the technical solution of the embodiments of the present application.
An embodiment of the present application provides a method for determining luminance compensation data, and fig. 4 is a schematic implementation flow chart of the method for determining luminance compensation data of the embodiment of the present application, as shown in fig. 4, where the method may include the following steps 401 to 404:
In implementation, the electronic device may determine the brightness measurement value of the pixel point of each sub-screen based on the display screen of the display screen shot by the high-definition camera. In some embodiments, the luminance measurement may be a normalized luminance, i.e., a relative luminance value; in other embodiments, the brightness measurement value may also be an absolute brightness value, that is, the brightness of the pixel point of the photographed display screen.
It is understood that the luminance standard values corresponding to different gray scales are different. Therefore, the steps 401 to 404 can obtain more accurate brightness compensation data corresponding to each sub-screen, so that when brightness compensation is performed on each sub-screen by using the brightness compensation data, the mura phenomenon of each sub-screen can be improved in a targeted manner, and especially for a full-screen with an under-screen camera, the mura phenomenon of an upper panel (i.e. the first sub-screen) of the camera can be improved better.
In the case where the apparatus that performs the determination method of the luminance compensation data and the apparatus that performs the luminance compensation method are the same apparatus, the apparatus may perform the luminance compensation method based on these compensation data after determining the luminance compensation data. In another case, that is, the apparatuses implementing the two methods are not the same apparatus, assuming that the apparatus implementing the determination method of the luminance compensation data is a first electronic apparatus and the apparatus implementing the luminance compensation method is a second electronic apparatus, the first electronic apparatus needs to transmit these data to the second electronic apparatus after obtaining the luminance compensation data. For example, the data is burned in a Flash ROM of the second electronic device.
In some embodiments, the brightness compensation data of the first sub-screen includes at least one sample compensation value corresponding to a pixel point; the method for determining the sample compensation value may include, as shown in fig. 5, the following steps 501 to 504:
and 504, determining the difference value corresponding to the pixel point as a sample compensation value corresponding to the pixel point.
The method for determining the brightness compensation data of the second sub-screen may be the same as or different from the method for determining the brightness compensation data of the first sub-screen. When the method is the same, the sample compensation value of the pixel point of the second sub-screen is obtained when the pixel point works at another gray level different from the specific gray level.
In some embodiments, the brightness compensation data of the first sub-screen includes a plurality of sample compensation values corresponding to each pixel point of the first sub-screen; the plurality of sample compensation values are determined when the first sub-screen is lit at the plurality of different specific gray levels, respectively.
Of course, the brightness compensation data of the second sub-screen may also include a plurality of sample compensation values corresponding to each pixel of the second sub-screen, where the compensation values are respectively determined when the second sub-screen is turned on at a plurality of other gray scales different from the specific gray scale.
For example, assume that a plurality of sample compensation values corresponding to one pixel point are 3 sample compensation values; as shown in table 1:
TABLE 1
| The number of times the full screen is lit | Working gray scale of first sub-screen | Working gray scale of second sub-screen |
| First time | 64 | 32 |
| Second time | 128 | 64 |
| Third time | 256 | 128 |
When the electronic device is used for realizing the lighting of the full screen for the first time, the first sub-screen can be lighted according to 64 gray scales, and the second sub-screen can be lighted according to 32 gray scales, so that the full screen displays the test image. Then, at this time, according to the collected brightness measurement value of the first sub-screen of the comprehensive screen, determining a first sample compensation value corresponding to the pixel point of the first sub-screen; and determining a first sample compensation value corresponding to the pixel point of the second sub-screen according to the acquired brightness measurement value of the second sub-screen of the comprehensive screen. Similarly, when the electronic device is used for lighting the full screen for the second time, the first sub-screen can be lighted according to 128 gray scales, and the second sub-screen can be lighted according to 64 gray scales, so that the full screen displays the test image. Based on the collected brightness measured values of the first sub-screen and the second sub-screen of the comprehensive screen, correspondingly determining a second sample compensation value corresponding to the pixel point of the first sub-screen and determining a second sample compensation value corresponding to the pixel point of the second sub-screen; the third sample compensation value is determined in the case where the first sub-screen is lit according to 256 gray scales and the second sub-screen is lit according to 128 gray scales.
Fig. 6A is a schematic flow chart illustrating an implementation of the brightness compensation method according to the embodiment of the present application, as shown in fig. 6A, where the method may include the following steps 601 to 606:
wherein input gray scales when the first sub-screen and the second sub-screen are lit are different when the brightness compensation data is determined;
It can be understood that curve fitting is performed on a plurality of sample compensation values corresponding to one pixel point, so that on one hand, the sample compensation value corresponding to each of 0 to 255 gray scales is not required to be calculated and stored, and therefore calculation cost and storage cost are saved; on the other hand, under the condition that the sample compensation value corresponding to a certain input gray level of the pixel point is not stored, the sample compensation value corresponding to the input gray level can be determined according to the determined fitting function relation, so that the brightness compensation method can realize brightness compensation under each gray level and has better universality.
When the method is implemented, the electronic equipment can utilize the target brightness compensation value of each pixel point to carry out compensation operation on the current gray level of the corresponding pixel point to obtain the target gray level of each pixel point; and controlling the working voltage of the light source of the corresponding pixel point according to the target gray level of each pixel point.
In implementation, the electronic device may execute steps 603 to 605 first, and then execute step 606; step 606 may be performed first, and then steps 603 to 605 may be performed; the steps may also be performed in parallel, i.e. the brightness compensation for each pixel point of the first sub-screen and the second sub-screen is achieved in parallel.
In some embodiments, after performing brightness compensation on the first sub-screen according to the first brightness compensation data and performing brightness compensation on the second sub-screen according to the second brightness compensation data, as shown in fig. 6B, the method may further include the following steps 611 and 612:
In implementation, the electronic device may adjust the driving current of the first sub-screen or the second sub-screen according to the luminance difference, thereby eliminating the luminance difference between the sub-screens.
The full screen display technology is a technical scheme for realizing full screen display on the front surface of the display terminal by hiding or lifting or side setting the front camera.
The under-screen camera shooting comprehensive screen technology is the next technical development focus of mainstream terminal manufacturers. No complete full screen product is offered by all manufacturers.
In the existing conceptual design, a screen panel (panel) is made into a low PPI display by dividing an area on a screen, namely, the first sub-screen area in one small area, generally in the position of a front camera, so that the permeability is increased, and a camera module is buried under the small area, thereby realizing the design of a full screen.
The main technical difficulty of realizing the comprehensive screen is as follows: the transmittance of the low PPI area can only reach 20% -30%, and the diffraction effect of the circuit structure of the transparent area has a great influence on the photographing effect of the under-screen photographing module; another major problem is that the display effect of the low PPI region is greatly different from that of the main screen region, including the problems of transition lines, color gamut, brightness, granularity of pixels, and the like in the vicinity, affecting the display effect.
How to realize the under-screen image capturing comprehensive screen, the embodiment of the application provides an under-screen image capturing comprehensive screen scheme, as shown in fig. 7, an area 1 is a transparent screen area, an area 2 is a transition area, and an area 3 is a normal main screen area. The area 1 employs OLED pixels plus transparent electrodes to enhance transmittance, and an opaque driving circuit is arranged to the area 2 (i.e., transition area) in the figure, and the pixels and thin film transistor (Thin Film Transistor, TFT) driving circuits of the area 3 in the figure are normally arranged.
Because only transparent pixels and transparent electrodes remain in the area 1, the light transmittance is greatly improved, the light transmittance of the transparent area is further enhanced by arranging an opaque driving electric side to the transition area 2, and the front camera is arranged below the transparent area, so that under-screen shooting is realized, and meanwhile, the design of a full screen is realized.
In the technical scheme of related under-screen photographing, the gap is generally increased by reducing pixels or changing pixel arrangement, so that the transmitted light quantity is increased. Because of the rearrangement design of the structure and density of the pixels and the driving circuit of the pixels, the phenomenon of uneven brightness (mura) of the screen in the under-screen area, which is more serious than that of the normal screen, can be caused, the mura can seriously affect the display effect, and the conventional OTP and the demux have lower efficiency and seriously affect the productivity.
Based on this, an exemplary application of the embodiments of the present application in one practical application scenario will be described below.
As shown in fig. 8, the area 3 is a normal display area, i.e. a second sub-screen area, and the pixels are arranged according to a conventional manner, including but not limited to a standard RGB arrangement, delta arrangement, pentile arrangement, etc., and have a pixel density of 403PPI. In the figure, the area 1 is a transparent display screen area, namely a first sub-screen area, and is identical to the physical pixel arrangement of the transition area 2, the arrangement mode is identical to that of the area 3, but the size of the pixels is increased, and the physical pixel density is changed into 200 PPI. The area 1 reduces 3/4 of the driving circuit wiring by means of connecting 4 physical pixels in the rectangular dividing area in parallel, the display area after being connected in parallel is similar to the gray transparent grid 801 shown in fig. 8, the metal wiring of the driving circuit can be greatly reduced by means of connecting a plurality of pixel areas in parallel, the transparency is increased, the diffraction effect is reduced, and the display pixel density of the transparent area 3 after being connected in parallel is 100PPI. The drive circuit of the transparent area 3 is connected to the transition area 2 by means of wires, arranged under the pixels of the transition area 2.
The pixel arrangement of the transition area 2 is identical to that of the conventional display area 3, but the granularity of the pixels is increased by two times, and at the same time PPI is reduced by half, and the pixel driving circuit of the transition area 2 itself is reduced by half, so that half of space is left for the driving circuit arrangement of the transparent display area 1.
The OLED pixels and the driving circuits of the transparent display area 1, the transition area 2 and the conventional display area 3 are arranged according to the method, and the driving circuits are connected to the DDIC, so that the full-screen display technical scheme is realized.
The sub-pixels of the transparent region 1 in fig. 8 employ transparent electrodes including, but not limited to, indium Tin Oxide (ITO) materials, etc., and the shape of the pixels of the transparent region 1 includes, but is not limited to, rounded rectangles, ovals, circles, and transition regions for filling up high and low pixels. The pixel driving circuit of the transparent region 1 includes, but is not limited to, 7T1C/5T1C/2T1C and the like. The transparent area 1 display screen adopts an Active-matrix organic light Emitting Diode (AMOLED) or a Passive-matrix organic light Emitting Diode (PMOLED).
A schematic diagram of the stacked structure of the display screen is shown in fig. 9. In the stacked configuration, it can be seen from fig. 9 that the transparent screen region is led out to the transition region with respect to the main screen and the transition region TFT driving circuit portion, and that there is a reflective layer only under the anode electrode in the transparent screen region. The transmittance of other places is close to 20%, so that the light transmittance is high. For the anti-reflection design, the anode circuit wires in the transparent screen area are replaced by ITO wire layers, so that the ITO transmittance is better.
For the design of the transparent screen area, it can be seen that the circuit routing layers around the pixels are all transparent, so that the incident light can penetrate the screen area, but the pixel structure of the OLED is as shown in fig. 10, and the reflectivity of the anode reflecting layer under the OLED light emitting unit is close to 100%, so that the light emitted by the OLED can be transmitted outside the screen, and therefore, even the anode of the transparent screen area is of an opaque design.
Such a design would result in an optically periodic grating-like structure and such a pixel structure design would be different from the original pixel structure design of the screen, and there would be no TFT structure underneath the transparent area, and therefore the optical characteristics of the screen display would be different. Such a screen design is highly likely to cause mura stripes, indeed, significant mura stripes are present.
As shown in fig. 11, which is a mura stripe actually occurring in the project, it can be seen from the figure that there is a significant vertical mura stripe in the transparent sub-screen area 112 (i.e., the first sub-screen area) and also a certain color cast phenomenon, compared to the main screen area 111 (i.e., the second sub-screen area).
Thus, separate Demura for the sub-screen area is an indispensable step.
For the conventional Demura process, as shown in fig. 12, after the screen module is turned on, the CCD is aligned for focusing, then the display data of the screen module is collected, the collected display data is compared and analyzed by the PC, the compensation data is generated by a correlation algorithm, and is burned onto the Flash of the flexible circuit board (Flexible Printed Circuit, FPC), and the Driver IC downloads and decompresses the compensation data. Therefore, when the module is lightened every time, the Driver IC extracts compensation data from the Flash and displays the compensation data together, so that mura-free display can be realized.
Conventional Demura as above is not sufficient for the secondary screen area to achieve full correction. For the auxiliary screen area, because the brightness of a single pixel is different from that of the main screen, an independent Demura process needs to be carried out on the auxiliary screen area, and the specific process is as shown in fig. 13, and the relative brightness values of the pixels with high, medium and low gray scales in the module are collected; analyzing the relative brightness value of the pixels under each gray level, and solving the pixel target value of the current gray level; obtaining a difference between the measured value and the target value for each pixel; taking the difference data as compensation data of the current gray level; acquiring compensation data of other gray scales; storing the compensation data to Flash; the drive IC downloads compensation data; fitting a compensation value of each pixel of 0 to 255 gray scales through an algorithm; carrying out operation on the original gray scale value and the compensation value of each pixel; new gray scale values obtained by all pixels; and taking the new gray scale value of the pixel as output data, and displaying a picture.
In a specific process, as an example, after the conventional Demura processing, the display effect of the secondary screen is shown as follows: 1, R/G/B monochromatic pictures can be supplemented; 2. the Mura is still serious under each gray level, and the compensation effect is not obvious; 3. the effect of the precisely measured Demura simulation graph is white and cannot be compensated; 4. with more regular light/dark space-like Mura, for example as shown in fig. 14, 5 regularly coupled dark bands are visible in the secondary screen area; 5. this phenomenon is not helpful in adjusting GOA/Mux/GIR. It can be seen that the complexity of the secondary screen area Demura far exceeds that of the conventional Demura of the primary screen area.
Thus, in doing Demura for an off-screen, it is necessary to do work on the off-screen area alone. The specific implementation steps are as follows:
1. firstly, normal demux is carried out on the demux process of the main screen area according to the brightness compensation flow, the mura of the main screen area is corrected, and the auxiliary screen area is needed to be scratched out when the part is executed.
2. After the main screen area is eliminated, aiming at the auxiliary screen area, correction is carried out independently according to the Demura process;
3. for the problems of color cast, interference and the like additionally existing in the auxiliary screen area, a special correction algorithm is required to be loaded at the DDIC end, so that the two problems are independently corrected;
4. after the correction of the two areas is completed, unified brightness matching is carried out, and the brightness difference of the main screen and the auxiliary screen is eliminated;
5. the existing Demura equipment is transformed, and the process of carrying out automatic Demura under the screen by carrying out automatic treatment on the Demura in two areas is realized;
through the technical scheme of the embodiment of the application, the process integration automation of the screen OTP and Demura is realized, after the correction of the main screen area OTP and demra is completed, OTP operation is carried out on the sub-screen area of the transparent screen under the screen according to the design of the main screen, meanwhile, the data of the main screen is recorded, and the brightness information of the main screen and the sub-screen is kept consistent. After OTP, aiming at mura stripes of the auxiliary screen area, brightness uniformity is respectively adjusted by adopting 5 to 6 groups of gray scales such as 32, 64, 128, 192 and 255, for the mura stripes which affect the same, the uniform compensation of fixed coefficients can be eliminated, for the condition that different mura are presented under different gray scales, the mura compensation is independently carried out for each group of gray scales, the coefficients are fixedly arranged in an IC, and the coefficients can be substituted in normal display, so that the brightness consistency of a main screen and an auxiliary screen is ensured.
In the related under-screen camera scheme, mura stripes of the under-screen area are caused due to different screen physical designs of the under-screen area, and in the conventional OTP and Demura equipment, an automatic control system for the under-screen area is not provided. Therefore, mura is corrected in a semi-automatic and semi-manual mode, so that the efficiency is low, the time is long, and the production efficiency and the quality uniformity are seriously affected. Through developing an automatic Demura system aiming at the under screen, after the Demura process is carried out on the main screen area, the mura stripes of the auxiliary screen area are specifically adjusted, so that the result after Demura can be efficiently obtained, and the consistency of the brightness and uniformity of the main screen and the auxiliary screen is realized.
Based on the foregoing embodiments, the brightness compensation device provided in the embodiments of the present application may include each module included, and each unit included in each module may be implemented by a processor in an electronic device; of course, the method can also be realized by a specific logic circuit; in an implementation, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Fig. 15 is a schematic structural diagram of a brightness compensation device according to an embodiment of the present application, as shown in fig. 15, the device 150 includes a lighting module 151, an obtaining module 152, and a compensation module 153, where:
A lighting module 151 that lights the first and second sub-screens of the display screen; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted;
an obtaining module 152, configured to obtain, from preconfigured data, first brightness compensation data corresponding to the first sub-screen and second brightness compensation data corresponding to the second sub-screen;
and the compensation module 153 is configured to perform brightness compensation on the first sub-screen according to the first brightness compensation data, and perform brightness compensation on the second sub-screen according to the second brightness compensation data, so as to improve brightness non-uniformity of the first sub-screen and the second sub-screen.
In some embodiments, the brightness compensation data of the first sub-screen includes at least one sample compensation value corresponding to a pixel point; the apparatus 150 further comprises a determination module for: determining a brightness measurement value of a pixel point of the first sub-screen when the first sub-screen is lightened under a specific gray level; determining a brightness standard value corresponding to the specific gray scale; determining a difference value between the brightness measured value of the pixel point of the first sub-screen and the brightness standard value; and determining the difference value corresponding to the pixel point as a sample compensation value of the corresponding pixel point.
In some embodiments, the brightness compensation data of the first sub-screen includes a plurality of sample compensation values corresponding to each pixel point of the first sub-screen; the plurality of sample compensation values are determined when the first sub-screen is lit at the plurality of different specific gray levels, respectively.
In some embodiments, compensation module 153 is configured to: performing curve fitting on a plurality of sample compensation values corresponding to the ith pixel point of the first sub-screen to obtain a fitting function relationship between gray scale and the sample compensation values; wherein i is greater than 0 and less than or equal to the total number of pixels of the first sub-screen; determining a target brightness compensation value of a corresponding pixel point according to the input gray scale when the first sub-screen is currently lightened and the fitting function relation corresponding to each pixel point; and carrying out brightness compensation on the corresponding pixel point by utilizing the target brightness compensation value of each pixel point.
In some embodiments, compensation module 153 is configured to: performing compensation operation on the current gray scale of the corresponding pixel point by using the target brightness compensation value of each pixel point to obtain the target gray scale of each pixel point; and controlling the working voltage of the light source of the corresponding pixel point according to the target gray level of each pixel point.
In some embodiments, the compensation module 153 is further configured to: after performing brightness compensation on the first sub-screen according to the first brightness compensation data and performing brightness compensation on the second sub-screen according to the second brightness compensation data, determining a brightness difference between the first sub-screen and the second sub-screen; and adjusting the brightness of the first sub-screen or the second sub-screen according to the brightness difference so as to eliminate the brightness difference between the first sub-screen and the second sub-screen.
An embodiment of the present application provides a device for determining luminance compensation data, fig. 16 is a schematic structural diagram of the device for determining luminance compensation data according to the embodiment of the present application, and as shown in fig. 16, the device 160 may include: a lighting module 161 and a determination module 162; wherein, the liquid crystal display device comprises a liquid crystal display device,
a lighting module 161, configured to light a first sub-screen of the display screen at a specific gray level; illuminating a second sub-screen of the display screen at another gray level different from the particular gray level; the first sub-screen is positioned above the front camera, and the light transmittance of the first sub-screen is larger than that of the second sub-screen;
a determining module 162, configured to determine brightness measurement values of pixels of the first sub-screen and the second sub-screen; determining corresponding first brightness compensation data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale; and determining corresponding second brightness compensation data according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale.
The description of the apparatus embodiments above is similar to that of the method embodiments above, with similar advantageous effects as the method embodiments. For technical details not disclosed in the device embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.
It should be noted that, in the embodiment of the present application, if the signal compensation method or the determination method of the brightness compensation data is implemented in the form of a software functional module, and sold or used as a separate product, the signal compensation method or the determination method of the brightness compensation data may also be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or part contributing to the related art, and the computer software product may be stored in a storage medium, including several instructions for causing an electronic device to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, an optical disk, or other various media capable of storing program codes. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
Correspondingly, the electronic device provided by the embodiment of the application may include: comprising a memory storing a computer program executable on the processor and a processor implementing the steps of the brightness compensation method or the determination method of brightness compensation data provided in the above embodiments when the processor executes the program.
The memory is configured to store instructions and applications executable by the processor, and may also cache data (e.g., image data, audio data, voice communication data, and video communication data) to be processed or processed by various modules in the processor and electronic device, which may be implemented by FLASH memory (FLASH) or random access memory (Random Access Memory, RAM).
The embodiment of the present application further provides a driving chip, and fig. 17 is a schematic structural diagram of the driving chip of the embodiment of the present application, and as shown in fig. 17, the driving chip 170 may include a lighting circuit 171, a data reading circuit 172, and a compensation circuit 173; wherein, the liquid crystal display device comprises a liquid crystal display device,
a lighting circuit 171 that lights the first sub-screen and the second sub-screen of the display screen; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted;
A data reading circuit 172, configured to obtain, from the preconfigured data, first brightness compensation data corresponding to the first sub-screen and second brightness compensation data corresponding to the second sub-screen;
and the compensation circuit 173 is configured to perform brightness compensation on the first sub-screen according to the first brightness compensation data, and perform brightness compensation on the second sub-screen according to the second brightness compensation data, so as to improve brightness non-uniformity of the first sub-screen and the second sub-screen.
Correspondingly, the computer readable storage medium provided in the embodiments of the present application has a computer program stored thereon, which when executed by a processor, implements the steps in the luminance compensation method or the determination method of luminance compensation data provided in the above embodiments.
It should be noted here that: the description of the storage medium and apparatus embodiments above is similar to that of the method embodiments described above, with similar benefits as the method embodiments. For technical details not disclosed in the embodiments of the storage medium and the apparatus of the present application, please refer to the description of the method embodiments of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "some embodiments" or "other embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" or "in some embodiments" or "in other embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.
Alternatively, the integrated units described above may be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or part contributing to the related art, and the computer software product may be stored in a storage medium, including several instructions for causing an electronic device to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a removable storage device, a ROM, a magnetic disk, or an optical disk.
The methods disclosed in the several method embodiments provided in the present application may be arbitrarily combined without collision to obtain a new method embodiment.
The features disclosed in the several product embodiments provided in the present application may be combined arbitrarily without conflict to obtain new product embodiments.
The features disclosed in the several method or apparatus embodiments provided in the present application may be arbitrarily combined without conflict to obtain new method embodiments or apparatus embodiments.
The foregoing is merely an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A brightness compensation method, the method comprising:
a first sub-screen and a second sub-screen of the display screen are lightened; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted; the brightness standard values corresponding to different gray scales are different;
acquiring first brightness compensation data corresponding to the first sub-screen from preconfigured data according to a brightness measured value of a pixel point of the first sub-screen and a brightness standard value under a corresponding gray level; acquiring second brightness compensation data corresponding to the second sub-screen according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale;
and carrying out brightness compensation on the first sub-screen according to the first brightness compensation data, and carrying out brightness compensation on the second sub-screen according to the second brightness compensation data so as to correct the uneven brightness phenomenon of the first sub-screen and the second sub-screen.
2. The method of claim 1, wherein the luminance compensation data of the first sub-screen includes at least one sample compensation value corresponding to a pixel point; the method for determining the sample compensation value comprises the following steps:
determining a brightness measurement value of a pixel point of the first sub-screen when the first sub-screen is lightened under a specific gray level;
determining a brightness standard value corresponding to the specific gray scale;
determining a difference value between the brightness measured value of the pixel point of the first sub-screen and the brightness standard value;
and determining the difference value corresponding to the pixel point as a sample compensation value of the corresponding pixel point.
3. The method of claim 2, wherein the luminance compensation data of the first sub-screen includes a plurality of sample compensation values corresponding to each pixel point of the first sub-screen; the plurality of sample compensation values are determined when the first sub-screen is lit at the plurality of different specific gray levels, respectively.
4. A method according to claim 3, wherein said performing brightness compensation on said first sub-screen according to said first brightness compensation data comprises:
performing curve fitting on a plurality of sample compensation values corresponding to the ith pixel point of the first sub-screen to obtain a fitting function relationship between gray scale and the sample compensation values; wherein i is greater than 0 and less than or equal to the total number of pixels of the first sub-screen;
Determining a target brightness compensation value of a corresponding pixel point according to the input gray scale when the first sub-screen is currently lightened and the fitting function relation corresponding to each pixel point;
and carrying out brightness compensation on the corresponding pixel point by utilizing the target brightness compensation value of each pixel point.
5. The method of claim 4, wherein the performing brightness compensation on the corresponding pixel using the target brightness compensation value of each pixel comprises:
performing compensation operation on the current gray scale of the corresponding pixel point by using the target brightness compensation value of each pixel point to obtain the target gray scale of each pixel point;
and controlling the working voltage of the light source of the corresponding pixel point according to the target gray level of each pixel point.
6. The method of claim 1, wherein after brightness compensating the first sub-screen according to the first brightness compensation data and brightness compensating the second sub-screen according to the second brightness compensation data, the method further comprises:
determining a brightness difference between the first sub-screen and the second sub-screen;
and adjusting the brightness of the first sub-screen or the second sub-screen according to the brightness difference so as to eliminate the brightness difference between the first sub-screen and the second sub-screen.
7. A method of determining luminance compensation data, the method comprising:
at a specific gray level, a first sub-screen of the display screen is lightened;
illuminating a second sub-screen of the display screen at another gray level different from the particular gray level; the first sub-screen is positioned above the front camera, and the light transmittance of the first sub-screen is larger than that of the second sub-screen;
determining brightness measurement values of pixel points of the first sub-screen and the second sub-screen;
determining corresponding first brightness compensation data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale;
determining corresponding second brightness compensation data according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale; the first brightness compensation data is used for carrying out brightness compensation on the first sub-screen so as to correct the uneven brightness phenomenon of the first sub-screen; the second brightness compensation data is used for carrying out brightness compensation on the second sub-screen so as to correct the uneven brightness phenomenon of the second sub-screen;
the brightness standard values corresponding to different gray scales are different.
8. Brightness compensation device, characterized in that it comprises:
The lighting module is used for lighting the first sub-screen and the second sub-screen of the display screen; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted; the brightness standard values corresponding to different gray scales are different;
the acquisition module is used for acquiring first brightness compensation data corresponding to the first sub-screen from preconfigured data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale; acquiring second brightness compensation data corresponding to the second sub-screen according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale;
and the compensation module is used for carrying out brightness compensation on the first sub-screen according to the first brightness compensation data, and carrying out brightness compensation on the second sub-screen according to the second brightness compensation data so as to correct the brightness non-uniformity phenomenon of the first sub-screen and the second sub-screen.
9. A device for determining luminance compensation data, the device comprising:
the lighting module is used for lighting the first sub-screen of the display screen under a specific gray level; illuminating a second sub-screen of the display screen at another gray level different from the particular gray level; the first sub-screen is positioned above the front camera, and the light transmittance of the first sub-screen is larger than that of the second sub-screen; the brightness standard values corresponding to different gray scales are different;
The determining module is used for determining brightness measurement values of pixel points of the first sub-screen and the second sub-screen; determining corresponding first brightness compensation data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale; determining corresponding second brightness compensation data according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale; the brightness standard values corresponding to different gray scales are different;
the first brightness compensation data is used for carrying out brightness compensation on the first sub-screen so as to correct the uneven brightness phenomenon of the first sub-screen; the second brightness compensation data is used for carrying out brightness compensation on the second sub-screen so as to correct the uneven brightness phenomenon of the second sub-screen.
10. The drive chip, its characterized in that, drive chip includes:
a lighting circuit that lights up a first sub-screen and a second sub-screen of the display screen; the first sub-screen is positioned above the front camera, the light transmittance of the first sub-screen is larger than that of the second sub-screen, and the input gray scales of the first sub-screen and the second sub-screen are different when the first sub-screen and the second sub-screen are lighted; the brightness standard values corresponding to different gray scales are different;
The data reading circuit is used for acquiring first brightness compensation data corresponding to the first sub-screen from preconfigured data according to the brightness measured value of the pixel point of the first sub-screen and the brightness standard value under the corresponding gray scale; acquiring second brightness compensation data corresponding to the second sub-screen according to the brightness measured value of the pixel point of the second sub-screen and the brightness standard value under the corresponding gray scale;
and the compensation circuit is used for carrying out brightness compensation on the first sub-screen according to the first brightness compensation data and carrying out brightness compensation on the second sub-screen according to the second brightness compensation data so as to correct the brightness non-uniformity phenomenon of the first sub-screen and the second sub-screen.
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