CN112542137A - Brightness compensation method, chip, device, equipment and storage medium - Google Patents
Brightness compensation method, chip, device, equipment and storage medium Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- 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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Abstract
The embodiment of the application discloses a brightness compensation method, a chip, a device, equipment and a storage medium; wherein the method comprises the following steps: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels; obtaining a target compensation value according to the first compensation value and the second compensation value; and lightening the sub-pixels according to the target compensation value and the preset gray scale.
Description
Technical Field
The embodiments of the present application relate to display technologies, and relate to, but are not limited to, a brightness compensation method, a chip, an apparatus, a device, and a storage medium.
Background
The display screen may have Mura stripes due to a manufacturing process or a screen structure. The Mura stripes are phenomena of various marks caused by non-uniform screen brightness. Mura streaks are currently eliminated primarily by the Demura technique. However, after the Demura technique performs Demura on the screen, new Mura stripes appear when the screen is displayed in a mixed color mode.
Disclosure of Invention
In view of this, the brightness compensation method, the chip, the apparatus, the device, and the storage medium provided in the embodiments of the present application can effectively solve the problem that new Mura stripes appear during screen color mixing display after the Mura stripes are eliminated by the Demura technology. The brightness compensation method, the chip, the device, the equipment and the storage medium provided by the embodiment of the application are realized as follows:
the brightness compensation method provided by the embodiment of the application comprises the following steps: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels; obtaining a target compensation value according to the first compensation value and the second compensation value; and lightening the sub-pixels according to the target compensation value and the preset gray scale.
The driving chip provided by the embodiment of the application is used for: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels; obtaining a target compensation value according to the first compensation value and the second compensation value; and lightening the sub-pixels according to the target compensation value and the preset gray scale.
The brightness compensation device provided by the embodiment of the application comprises: an acquisition module to: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels; a determination module to: obtaining a target compensation value according to the first compensation value and the second compensation value; a compensation module to: and lightening the sub-pixels according to the target compensation value and the preset gray scale.
The electronic device provided by the embodiment of the application comprises a memory and a processor, wherein the memory stores a computer program which can run on the processor, and the processor executes the program to realize the method provided by the embodiment of the application.
The computer readable storage medium provided by the embodiment of the present application has a computer program stored thereon, and the computer program is used for implementing the method described in the embodiment of the present application when being executed by a processor.
In the embodiment of the application, a brightness compensation method is provided, in which a first compensation value and a second compensation value corresponding to a preset gray scale of a sub-pixel to be lighted are obtained; obtaining a target compensation value according to the first compensation value and the second compensation value; and lightening the sub-pixels according to the target compensation value and a preset gray scale. Through the comprehensive analysis of the first compensation value and the second compensation value, a more accurate target compensation value is obtained, so that the problem that new Mura stripes appear when screen color mixing display is carried out after the Mura stripes are eliminated through the Demura technology can be effectively solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic flow chart illustrating an implementation of a brightness compensation method according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart illustrating an implementation of another brightness compensation method according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a full screen;
fig. 4 is a schematic flow chart illustrating an implementation of another brightness compensation method according to an embodiment of the present application;
fig. 5 is a schematic flow chart illustrating an implementation of another luminance compensation method according to an embodiment of the present disclosure;
FIG. 6 is a schematic view of a full screen in accordance with an embodiment of the present application;
FIG. 7 is another schematic view of a full screen in accordance with an embodiment of the present application;
FIG. 8 is a schematic diagram of a stacked structure of a display screen according to an embodiment of the present application;
fig. 9 is a schematic view of a pixel structure of an Organic Light Emitting Diode (OLED) according to an embodiment of the present application;
FIG. 10 shows examples of the present application in which ITO, TPD, Alq are made of flat glass3Or Mg is a schematic diagram of the optical coupling process of the Ag device;
FIG. 11 is a schematic diagram of electrical properties of a TFT according to an embodiment of the present disclosure;
FIG. 12 is a schematic view of another electrical property of a TFT according to an embodiment of the present application;
FIG. 13 is a schematic representation of yet another electrical property of a TFT according to an embodiment of the present application;
FIG. 14 is a schematic view of another electrical property of a TFT according to an embodiment of the present application;
FIG. 15 is a schematic view of yet another electrical property characteristic of a TFT according to an embodiment of the present application;
FIG. 16 is a schematic diagram of a related Demura procedure;
FIG. 17 is a schematic diagram of a Demura flow of associated sub-screen areas;
FIG. 18 is a diagram illustrating the display effect of the sub-screen area;
FIG. 19 is a schematic structural diagram of a luminance compensation device according to an embodiment of the present application;
fig. 20 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 intended to illustrate 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 application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
It should be noted that the terms "first \ second \ third" are used herein to distinguish similar or different objects and do not denote a particular order or importance to the objects, and it should be understood that "first \ second \ third" may be interchanged with a particular order or sequence where permissible to enable embodiments of the present application described herein to be practiced otherwise than as shown or described herein.
The embodiment of the present application provides a brightness compensation method, which is applied to any electronic device with a display function, for example, the electronic device may include a mobile phone, a tablet computer, a notebook computer, a desktop computer, a personal digital assistant, a smart watch, a smart band, a video phone, an e-reader, a television, or the like. The functions implemented by the method can be implemented by calling program code by a processor in an electronic device, and the program code can be stored in a computer storage medium.
Fig. 1 is a schematic flow chart of an implementation of a brightness compensation method according to an embodiment of the present application, as shown in fig. 1, the method may include the following steps 101 to 103:
in some embodiments, the pixel region may be a white pixel region composed of red, green, and blue sub-pixels. The input gray scale of each sub-pixel of the pixel region is a preset gray scale, that is, the first compensation value and the second compensation value are obtained under the preset gray scale with the same size.
In some embodiments, the electronic device may first determine the first compensation values at some typical gray levels, and then fit the first compensation values at the remaining gray levels according to the values. The second compensation value is determined for each gray level in a manner similar to the first compensation value. The electronic device may store the first compensation value and the second compensation value for each gray level in a memory of the electronic device in advance. For example, burned into a Flash memory (Flash ROM) of an electronic device. In this way, when the electronic device responds to an instruction for instructing to light the screen, and the first compensation value and the second compensation value under each gray scale are required to be determined, the first compensation value and the second compensation value which are stored in advance can be directly called, and then the target compensation value is obtained according to the first compensation value and the second compensation value. Therefore, the process of fitting calculation is saved, and the display real-time performance is improved.
In other embodiments, the electronic device may store the fitting function in a memory of the electronic device after obtaining the fitting function. For example, burned into a Flash memory (Flash ROM) of an electronic device. When the electronic equipment responds to and indicates an instruction for lighting the screen, the corresponding fitting function is called to calculate under the condition that the first compensation value and the second compensation value under the preset gray scale are required to be determined. Therefore, the storage resources can be effectively saved.
In some embodiments, the fitting function may include a first fitting function and a second fitting function, the first fitting function being a function of a mapping relationship between the preset gray scale and the first compensation value, and the second fitting function being a function of a mapping relationship between the preset gray scale and the second compensation value.
Wherein the first fitting function may be obtained by: determining a first luminance target value when the sub-pixels are lit at a specific gray scale; measuring a first luminance measurement value when the sub-pixel is lit at a specific gray level; obtaining a first compensation value according to the difference value between the first brightness target value and the first brightness measured value; and performing curve fitting or interpolation calculation on the first compensation values under different specific gray scales to obtain a first fitting function.
The second fitting function can also be obtained in the same way: determining a second luminance target value when the pixel region is lit at a specific gray scale; measuring a second luminance measurement value when the pixel region is lit at the specific gray level; obtaining a second compensation value according to the difference value between the second brightness target value and the second brightness measured value; and performing curve fitting or interpolation calculation on the second compensation values under different specific gray scales to obtain a second fitting function.
102, obtaining a target compensation value according to the first compensation value and the second compensation value;
in some embodiments, the electronic device may implement step 102 according to steps 202 and 203 of the following embodiments. To avoid repetition, further description is omitted here.
In some embodiments, the obtained target compensation value may be burned into a Flash memory (Flash ROM) of the electronic device. Therefore, when the electronic equipment responds to a command for indicating to light the screen in the subsequent process, the electronic equipment can carry out brightness compensation on the sub-pixels under the preset gray scale by calling the pre-stored target compensation value of the preset gray scale.
In some embodiments, when the electronic device receives an instruction to light a screen, performing compensation operation on a preset gray scale of a sub-pixel according to the target compensation value to obtain a target gray scale of the sub-pixel; the electronic device controls the working voltage corresponding to the sub-pixel according to the target gray scale of the sub-pixel, thereby lighting the sub-pixel.
In the embodiment of the application, a brightness compensation method is provided, in which a first compensation value and a second compensation value corresponding to a preset gray scale of a sub-pixel to be lighted are obtained; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels; obtaining a target compensation value according to the first compensation value and the second compensation value; and lightening the sub-pixels according to the target compensation value and the preset gray scale. The electronic equipment obtains a more accurate target compensation value by comprehensively analyzing the first compensation value and the second compensation value, so that the problem of new Mura stripes when the screen is subjected to color mixing display can be effectively solved.
Fig. 2 is a schematic flow chart illustrating an implementation of another luminance compensation method provided in the embodiment of the present application, and as shown in fig. 2, the method may include the following steps 201 to 204:
in some embodiments, the sub-pixels belong to a screen overlaid over the camera. For example, in the sub-screen area 301 of the full-screen 30 shown in fig. 3, the camera module is embedded under the sub-screen area 301. The full-screen 30 shown in fig. 3 is divided into a main screen area 302 and a sub-screen area 301, the sub-screen area 301 (generally at the position of the front camera) is designed to be displayed with low pixel density (Pixels Per inc, PPI) to increase the transmittance, and the main screen area 302 is a normal display area, so that the full-screen design is realized. However, even if the conventional Demura technique is adopted to compensate the brightness of the sub-screen area, the Mura stripe still exists in the design of the structure. In view of this, in the embodiment of the present application, a luminance compensation method is provided, in which a first compensation value of a preset gray scale of a sub-pixel to be lit is obtained, and a second compensation value corresponding to the gray scale is also obtained, so as to obtain a target compensation value according to the two compensation values, thereby enabling an electronic device to better compensate the luminance of the sub-pixel, and eliminating the Mura stripe problem in a sub-screen area.
the preset threshold may be preset by a developer and stored in a memory of the electronic device. In some embodiments, the preset threshold includes a first threshold and a second threshold, the first threshold is smaller than the second threshold, and the electronic device may implement step 203 through steps 403 to 407 of the following embodiments, or may also implement step 203 through steps 503 to 508 of the following embodiments. To avoid repetition, further description is omitted here.
And 204, lighting the sub-pixels according to the target compensation value and the preset gray scale.
In the embodiment of the application, a brightness compensation method is provided, which is applied to sub-pixels of a screen above a camera under the screen, and can solve the problem that new Mura stripes are introduced when the color mixing display of the screen is performed due to the fact that the light intensity of a sub-screen area is inconsistent with the monochromatic correction.
Fig. 4 is a schematic flow chart illustrating an implementation of another luminance compensation method provided in the present embodiment, and as shown in fig. 4, the method may include the following steps 401 to 408.
step 403, judging whether the absolute value of the difference value is less than or equal to a first threshold value; if yes, go to step 404; otherwise, go to step 405;
step 404, using the first compensation value as the target compensation value;
step 406, using the second compensation value as the target compensation value;
it can be understood that, when the absolute value of the difference between the first compensation value and the second compensation value is greater than the second threshold, it indicates that the difference between the first compensation value and the second compensation value is very large, and the first compensation value is determined based on the sub-pixel, and the second compensation value is determined based on the pixel region, so in this case, the confidence level indicating the first compensation value is relatively low, and when the second compensation value is used as the target compensation value, the brightness compensation is performed for the sub-pixel, so that the Mura stripe problem can be better improved, and the display effect of the screen can be improved.
that is, when the absolute value of the difference is greater than the first threshold value and less than or equal to the second threshold value, step 407 is performed.
It is understood that the difference between the first compensation value and the second compensation value may be greater than 0 or less than 0, and therefore, when the difference between the first compensation value and the second compensation value is determined, it is necessary to take the absolute value of the difference and compare the absolute value of the difference with the first threshold and the second threshold.
In some embodiments, the first threshold is less than the second threshold.
In some embodiments, the mean of the first compensation value and the second compensation value may be an average or a weighted average. When the mean value is a weighted mean value, different weights may be given to the first compensation value and the second compensation value, and the weighted mean value of the first compensation value and the second compensation value is determined by performing weighted mean on the first compensation value and the second compensation value according to the weights.
In other embodiments, step 405 may also be performed first, that is, it may be determined whether an absolute value of a difference between the first compensation value and the second compensation value is greater than a second threshold value, and if so, step 406 is performed; otherwise, step 403 is performed, i.e. it is determined whether the absolute value of the difference is less than or equal to the first threshold, if so, step 404 is performed, otherwise, step 407 is performed. That is to say, in the embodiment of the present application, the order of determining the magnitude relationship between the absolute value of the difference and the first threshold and the magnitude relationship between the absolute value of the difference and the second threshold are not limited, and the magnitude relationship between the absolute value of the difference and the first threshold may be determined first, or the magnitude relationship between the absolute value of the difference and the second threshold may be determined first.
In an embodiment of the present application, there is provided a luminance compensation method in which an electronic device determines a target compensation value by comparatively analyzing a relationship between a difference value of a first compensation value and a second compensation value and a first threshold value and a second threshold value; therefore, the accuracy of the target compensation value can be improved, the Mura stripe problem can be improved better, and the display effect of the screen during mixed color display can be improved.
Fig. 5 is a schematic flow chart illustrating an implementation of another luminance compensation method provided in the present embodiment, and as shown in fig. 5, the method may include the following steps 501 to 509.
step 506, using the second compensation value as the target compensation value;
in the embodiment of the present application, it is not limited which gray scales the plurality of different gray scales are, and the plurality of different gray scales may include each gray scale, or may be a gray scale having a distance from the preset gray scale within a preset range.
that is, when the absolute value of the difference is greater than the first threshold value and less than or equal to the second threshold value, steps 507 and 508 are performed.
In some embodiments, the first threshold is less than the second threshold.
It is understood that the second compensation values at different gray levels are different, and in some embodiments, the electronic device may obtain the corresponding second compensation values at a plurality of gray levels by calling a second fitting function pre-stored in the memory.
In some embodiments, the average value may be an average value or a weighted average value of the corresponding second compensation values at a plurality of different gray levels. When the average value is a weighted average value, different weights can be given to the second compensation value of each gray scale according to the proximity degree of the different gray scales and the preset gray scale. For example, the second compensation value corresponding to the gray scale closer to the preset gray scale is given with higher weight, and the second compensation value corresponding to the gray scale farther away is given with lower weight; and carrying out weighted average on the second compensation values corresponding to the plurality of different gray scales according to the weight values, and determining the weighted average value of the second compensation values corresponding to the plurality of different gray scales. In other embodiments, the regression value may also be a median of the corresponding second compensation values at a plurality of different gray levels. That is, the second compensation values corresponding to different gray levels are arranged in order of magnitude to form a plurality of rows, and the second compensation value at the middle position of the plurality of rows is the median of the second compensation values.
In the embodiment of the present application, a luminance compensation method is provided, in which when an absolute value of a difference between a first compensation value and a second compensation value is greater than a first threshold and less than or equal to a second threshold, a target compensation value is determined by a mean value or a median value of the second compensation values under a plurality of gray scales, so that accuracy of the target compensation value can be further improved, a Mura stripe problem can be further improved, and a screen display effect can be improved.
The full-screen display technology is a technical scheme for realizing full-screen display on the front side of a display terminal by hiding or lifting a front camera, arranging the front camera at the side and the like. The full screen technology of shooting under the screen is the key point of the next technical development of mainstream terminal manufacturers. There is no complete full screen product being released by each manufacturer. In related concept design, a screen panel (panel) is mainly divided into small areas on a screen, generally at the position of a front camera, a low PPI display is made to increase the permeability, and a camera module is buried under the small areas, so that the design of a full-face screen is realized.
The main technical difficulties for realizing the full-screen are as follows: the transmittance of the low PPI region can only reach 20-30%, and the diffraction effect of the circuit structure of the transparent region has a large influence on the photographing effect of the under-screen camera 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 line, color gamut, brightness, granularity of pixels, etc. in the adjacent region, which affect the display effect.
Therefore, a full-screen scheme for under-screen image pickup is proposed, as shown in fig. 6, a region 1 in fig. 6 is a transparent screen region, a region 2 in the figure is a transition region, a region 3 in the figure is a normal main screen region, the region 1 adopts OLED pixels and transparent electrodes to enhance transmittance, an opaque driving circuit is arranged in the transition region of the region 2 in the figure, and pixels and TFT driving circuits in the region 3 in the figure are normally arranged.
Only transparent pixels and transparent electrodes are left in the area 1, so that light transmittance is greatly improved, the opaque driving circuit is arranged in the transition area 2, the transmittance of the transparent area is further enhanced, the front camera is arranged below the transparent area, under-screen shooting is achieved, and meanwhile, the design of a comprehensive screen is achieved.
In the related art of under-screen image capture, the amount of transmitted light is generally increased by reducing pixels or changing the arrangement of pixels to increase gaps. Redesigning the pixels of the area under the screen can make the pixel structures of the area under the screen and the area of the main screen different, thereby causing the situation of the main screen and the auxiliary screen to be inconsistent during the Mura correction of the screen. Screen device design inconsistencies and the effects of different device sensitivities to illumination are not taken into account in related approaches. Therefore, in the correlated Demura correction process, after the Mura correction is performed on the RGB single colors, the uniform screen and the color mixing screen after Demura can be automatically obtained. However, in the project under the screen, it is impossible to realize the complete Demura through the above-described process.
In the embodiment of the present application, as shown in fig. 7, the area 3 is a normal display area, pixels are arranged in a conventional manner, including but not limited to a standard RGB arrangement, a Delta arrangement, or a Pentile arrangement, and the pixel density is 403 PPI. In the figure, the region 1 is a transparent display region and has the same physical pixel arrangement as the transition region 2 and the same physical pixel arrangement as the region 3, but the pixel size is increased to 200PPI physical pixel density. The area 1 reduces 3/4 driving circuit wiring in a mode of connecting 4 physical pixels in the rectangular partition area in parallel, the display blocks after parallel connection are similar to those shown in a gray transparent grid 701 in fig. 7, the metal wiring of the driving circuit can be greatly reduced in a mode of connecting multiple pixel blocks in parallel, the transparency is increased, the diffraction effect is reduced, and the display pixel density of the transparent area 1 after parallel connection is 100 PPI. The drive circuit of the transparent area 1 is connected to the transition area 2 by a wiring, and is arranged under the pixels of the transition area 2.
The pixel arrangement of the transition region 2 is identical to that of the normal display region 3, but the granularity of the pixels is increased by two times, and the PPI is reduced by half, and the pixel driving circuit of the transition region 2 itself is reduced by half, so that half of the space is left for the driving circuit arrangement of the transparent display region 1.
The OLED pixels and the driving circuit in the transparent display area 1, the transition area 2 and the normal display area 3 are arranged according to the method, and the driving circuit is connected to a display Drive IC, so that the technical scheme of full-screen display is realized.
In fig. 7, the sub-pixels of the transparent area 1 are transparent electrodes including, but not limited to, Indium Tin Oxide (ITO) material, and the shape of the pixels of the transparent area 1 includes, but not limited to, rounded rectangles, ovals, circles, and in order to fill the transition areas of the high and low pixels. The pixel driving circuit of the transparent region 1 includes, but is not limited to, 7T1C, 5T1C, or 2T 1C. The display screen of the transparent area 1 adopts an Active-Matrix Organic Light-Emitting Diode (AMOLED) or a Passive-Matrix Organic electroluminescent Diode (PMOLED).
Fig. 8 is a schematic diagram of a stacked structure of display screens. As can be seen from fig. 8, in the stacked structure, the transparent screen region is led out to the transition region with respect to the main screen and transition region TFT driver circuit portions, and the reflective layer is present only under the anode in the transparent screen region. The transmittance of other parts is close to 20%, and the light transmittance is strong. In order to increase the reflection, the anode circuit routing in the transparent screen area is replaced by an ITO routing layer, so that the ITO transmittance is better.
For the design of the transparent screen region, it can be seen that the circuit wiring layers around the pixels are all transparent and can allow incident light to penetrate through the screen region, but the OLED pixel structure is as shown in fig. 9, and the reflectivity of the anode reflective layer under the OLED light-emitting unit is close to 100%, so as to allow the light emitted by the OLED to be transmitted out of the screen, and therefore, even the anode in the transparent screen region is also opaque.
In the primary and secondary screen designs described above, the apparent secondary screen area is of a different laminate structure than the primary screen, the first point being the slight secondary screen areaThe cavity effect is weaker and the light out-coupling capability is different from the main screen area, as shown in FIG. 10, and FIG. 10 shows ITO, TPD, Alq using plate glass as a substrate3Or Mg: Ag device. The micro-cavity effect is an optical interference inside the device, and in the OLED, there are cavity effects with different degrees in both the top emission type and the bottom emission type. The microcavity effect mainly means that the photon density of different energy states is redistributed so that only light with specific wavelength can be emitted at a specific angle after conforming to the resonant cavity mode. The full width at half maximum (FWHM) of the light wave will also be narrowed, and the intensity and wavelength of the light wave will also be different at different angles. Under proper control, the color purity and efficiency of the upper light-emitting device can be greatly improved compared with those of the lower light-emitting device. The second point is that the TFT driving devices suffer from different optical effects. As shown in fig. 11 to 15, since the TFT is a silicon-based device, the electrical characteristics are different when the intensity of light is different. Under different light intensity illumination conditions, the mobility and threshold voltage of the TFT itself are affected.
From the above theoretical analysis, it can be seen that a new problem is encountered in the Demura process of the under-screen image pickup, namely, the result deviation of Demura caused by the photoelectric coupling effect.
In the related Demura process, as shown in fig. 16, after the screen module is lit, the CCD performs alignment focusing, then the display data of the screen module is collected, the PC compares and analyzes the collected display data, generates compensation data through a related algorithm, and burns the compensation data into Flash of a Flexible Circuit board (FPC), and the Driver IC downloads and decompresses the compensation data. Thus, when the module is lightened each time, the Driver IC extracts the compensation data from the Flash and displays the compensation data together, thereby realizing the display without Mura.
However, Demura as above is not sufficient to achieve full correction for the sub-screen area. For the sub-screen area, because the single-pixel brightness is different from that of the main screen, an independent Demura process needs to be performed on the sub-screen area, for example, as shown in fig. 17, the relative brightness values of the pixels with high, medium and low gray scales in the acquisition module are acquired; analyzing the relative brightness value of the pixel under each gray scale to obtain the pixel target value of the current gray scale; obtaining a difference between the measured value and the target value for each pixel; using the difference data as compensation data of the current gray scale; acquiring compensation data of other gray scales; storing the compensation data to Flash; the drive IC downloads the compensation data; fitting a compensation value of each pixel of 0 to 255 gray scales through an algorithm; calculating the original gray-scale value and the compensation value of each pixel; new gray scale values obtained for all pixels; and displaying the picture by using the new gray-scale value of the pixel as output data.
In the above Demura process, the RGB single-color respective gray scales are treated separately, and a result of correcting Mura separately for each color can be obtained. After the single color correction is finished, the correction can be realized for each color and gray scale such as color mixing, white and the like, and the required screen uniformity index can be reached.
However, in the foregoing analysis, it can be seen that a photoelectric coupling effect occurs for the under-screen camera sub-screen area. In a specific Demura process, the Mura stripes are corrected in a monochromatic Demura process, and in a color mixing mode, a coupling effect is brought because the light intensity of a sub-screen area is inconsistent with that in the monochromatic correction, so that new Mura stripes are introduced in color mixing. As shown in fig. 18, which is the Mura stripe actually occurring in the project, it can be seen that vertical Mura stripes are clearly present in the transparent sub-screen region 181 as compared to the main screen region 182.
In order to solve the problem of nonuniform monochrome color mixing, the processing mode and algorithm of the DDIC are changed by a Display Driving Chip (DDIC) processing mechanism.
Based on this, an exemplary application of the embodiment of the present application in a practical application scenario will be described below.
Therefore, in the process of performing Demura on the sub-screen area, work needs to be separately performed on the sub-screen area. The specific execution steps are as follows:
1. adjusting the capacity of a Flash Memory (Flash) and a Static Random-Access Memory (SRAM) and increasing data storage;
2. in the Demura burning process, a new algorithm is added on the basis of the inheritance of the process;
3. the new algorithm comprises: and carrying out mura correction on each gray scale of the white picture. Dividing three pixels of RGB into a white pixel block;
4. luminance acquisition and demura flow treatment under pure white picture are performed for one white pixel (including RGB sub-pixels, an example of the pixel area).
5. And comparing the compensation data values of each typical gray scale under the pure white picture and the RGB single-color picture.
6. For unbiased pixels, the monochrome compensation values are retained, and for the case where the Demura compensation values are different under white and monochrome conditions, sets of compensation values are retrieved back to value.
7. If the compensation values are very different in monochrome and white, the targeted data is added in the Demura processing mechanism. Different Demura offset data is extracted in different cases of invocation. For example, if the white color compensation value is very different from the pure color compensation value at a certain gray level, the white color Demura compensation value (i.e. an example of the second compensation value) is called directly when displaying the white screen instead of the pure color Demura compensation value (i.e. an example of the first compensation value).
8. Through the above processing, the internal processing circuit and the storage space of the DDIC are expanded, so that the correction of the photoelectric coupling effect of the sub-screen area in the under-screen camera demrua is realized, and the display effect is maintained.
Through the scheme, the problem that the display effects of the main screen and the auxiliary screen which are different in device design are inconsistent can be corrected through a multi-group Demura data compensation mode. Therefore, the consistency of the display effect of the auxiliary screen and the main screen in the area below the screen can be ensured. In the DDIC design, Demura only has fixed group data, so the storage capacity and data volume of the DDIC are increased in the scheme, and in addition, an interpolation algorithm is carried out on the gray scale without real correction. Therefore, the display effect of the main screen and the auxiliary screen is consistent under each gray scale brightness.
In the scheme of shooting under the screen, because the pixel design of the auxiliary screen area is different from the pixel design of the main screen area, the performance of the device of the auxiliary screen is not completely consistent with that of the device of the main screen, and therefore when the main screen and the auxiliary screen simultaneously Demura, the brightness and color cast correction cannot meet the requirement of uniformity. Therefore, in the embodiment of the application, the Demura is generated into a plurality of groups of data, and the Demura data correction is carried out on a plurality of gray scales through the optimization of a DDIC processing mechanism, so that the display effect consistency of the main screen and the auxiliary screen under different brightness is ensured. In addition, interpolation compensation is carried out on gray scales without target points through an interpolation method, so that the consistency of the display effect of the main screen and the auxiliary screen under the brightness of each gray scale is ensured.
Based on the foregoing embodiments, an embodiment of the present application further provides a driving chip, where the driving chip is configured to: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels; obtaining a target compensation value according to the first compensation value and the second compensation value; and lightening the sub-pixels according to the target compensation value and the preset gray scale.
The above description of the chip embodiment is similar to the description of the method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the embodiments of the chip of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
Correspondingly, the embodiment of the application provides a brightness compensation device, which comprises modules and units included in the modules, and can be realized by a processor in an electronic device; of course, the implementation can also be realized through a specific logic circuit; in 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. 19 is a schematic structural diagram of a luminance compensation apparatus according to an embodiment of the present application, and as shown in fig. 19, the apparatus 190 includes an obtaining module 191, a determining module 192, and a compensating module 193, where:
an obtaining module 191 configured to: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels;
a determining module 192 for: obtaining a target compensation value according to the first compensation value and the second compensation value;
a compensation module 193 for: and lightening the sub-pixels according to the target compensation value and the preset gray scale.
In some embodiments, the sub-pixels belong to a screen overlaid over the camera.
In some embodiments, the determining module 192 is configured to: determining a difference between the first compensation value and the second compensation value; and obtaining the target compensation value according to the relation between the difference value and a preset threshold value.
In some embodiments, the preset threshold includes a first threshold and a second threshold, the first threshold is less than the second threshold, the determining module 192 is configured to: when the absolute value of the difference is less than or equal to the first threshold, taking the first compensation value as the target compensation value; and when the absolute value of the difference is larger than the second threshold, taking the second compensation value as the target compensation value.
In some embodiments, the determining module 192 is configured to: when the absolute value of the difference value is greater than the first threshold and less than or equal to the second threshold, determining the mean value of the first compensation value and the second compensation value, and taking the mean value as the target compensation value; or when the absolute value of the difference value is greater than the first threshold and less than or equal to the second threshold, acquiring corresponding second compensation values under a plurality of different gray scales; and obtaining the target compensation value according to the corresponding second compensation values under the different gray scales.
In some embodiments, the determining module 192 is configured to: determining regression values of corresponding second compensation values under the different gray scales, and taking the regression values as the target compensation values; wherein the regression value is a mean or median.
The above description of the apparatus embodiments, similar to the above description of the method embodiments, has similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the apparatus of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
It should be noted that the division of the luminance compensation apparatus shown in fig. 19 into modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, may exist alone physically, or may be integrated into one unit by two or more units. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. Or may be implemented in a combination of software and hardware.
It should be noted that, in the embodiment of the present application, if the brightness compensation method is implemented in the form of a software functional module and is sold or used as a standalone product, the brightness compensation method 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 embodied in the form of a software product, which is stored in a storage medium and includes 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 usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
Correspondingly, as shown in fig. 20, in the electronic device 200 provided in the embodiment of the present application, the electronic device 200 may include: comprising a memory 201 and a processor 202, said memory 201 storing a computer program operable on the processor 202, said processor 202 implementing the steps in the methods provided in the embodiments described above when executing said program.
The Memory 201 is configured to store instructions and applications executable by the processor 202, and may also buffer data (e.g., image data, audio data, voice communication data, and video communication data) to be processed or already processed by the processor 202 and modules in the electronic device 200, and may be implemented by a FLASH Memory (FLASH) or a Random Access Memory (RAM). Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps in the brightness compensation method provided in the above embodiments. Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps in the brightness compensation method provided in the above embodiments.
Embodiments of the present application provide a computer program product containing instructions, which when run on a computer, cause the computer to execute the brightness compensation method provided by the above method embodiments.
Here, it should be noted that: the above description of the storage medium and device embodiments is similar to the description of the method embodiments above, with similar advantageous effects as the method embodiments. For technical details not disclosed in the embodiments of the storage medium, the chip and the terminal device of the present application, reference is made to the description of the embodiments of the method of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiments 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" 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 the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments. The foregoing description of the various embodiments is intended to highlight various differences between the embodiments, and the same or similar parts may be referred to each other, and for brevity, will not be described again herein.
The term "and/or" herein is merely an association relationship describing an associated object, and means that three relationships may exist, for example, object a and/or object B, may mean: the object A exists alone, the object A and the object B exist simultaneously, and the object B exists alone.
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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and other divisions may be realized in practice, such as: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or modules may be electrical, mechanical or other.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules; can be located in one place or distributed on a plurality of network units; some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may be separately regarded as one unit, or two or more modules may be integrated into one unit; the integrated module can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes 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 removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The methods disclosed in the several method embodiments provided in the present application may be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or apparatus embodiments provided in the present application may be combined arbitrarily, without conflict, to arrive at new method embodiments or apparatus embodiments.
The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the 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 method of brightness compensation, the method comprising:
acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels;
obtaining a target compensation value according to the first compensation value and the second compensation value;
and lightening the sub-pixels according to the target compensation value and the preset gray scale.
2. The method of claim 1, wherein the sub-pixels belong to a screen overlaid over a camera.
3. The method according to claim 1 or 2, wherein the obtaining a target compensation value according to the first compensation value and the second compensation value comprises:
determining a difference between the first compensation value and the second compensation value;
and obtaining the target compensation value according to the relation between the difference value and a preset threshold value.
4. The method of claim 3, wherein the preset threshold comprises a first threshold and a second threshold, and wherein the first threshold is smaller than the second threshold;
the obtaining the target compensation value according to the relationship between the difference value and a preset threshold value includes:
when the absolute value of the difference is less than or equal to the first threshold, taking the first compensation value as the target compensation value;
and when the absolute value of the difference is larger than the second threshold, taking the second compensation value as the target compensation value.
5. The method of claim 4, wherein obtaining the target compensation value according to the relationship between the difference and a preset threshold further comprises:
when the absolute value of the difference value is greater than the first threshold and less than or equal to the second threshold, determining the mean value of the first compensation value and the second compensation value, and taking the mean value as the target compensation value;
or when the absolute value of the difference value is greater than the first threshold and less than or equal to the second threshold, acquiring corresponding second compensation values under a plurality of different gray scales; and obtaining the target compensation value according to the corresponding second compensation values under the different gray scales.
6. The method of claim 5, wherein obtaining the target compensation value according to the corresponding second compensation values at the different gray levels further comprises:
determining regression values of corresponding second compensation values under the different gray scales, and taking the regression values as the target compensation values; wherein the regression value is a mean or median.
7. A driver chip, wherein the chip is configured to:
acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels;
obtaining a target compensation value according to the first compensation value and the second compensation value;
and lightening the sub-pixels according to the target compensation value and the preset gray scale.
8. An illumination compensation apparatus, comprising:
an acquisition module to: acquiring a corresponding first compensation value and a corresponding second compensation value according to a preset gray scale of a sub-pixel to be lightened; wherein the first compensation value is determined according to the brightness measurement value of the sub-pixel at the preset gray scale, the second compensation value is determined according to the brightness measurement value of the pixel area at the preset gray scale, and the pixel area is composed of at least two sub-pixels;
a determination module to: obtaining a target compensation value according to the first compensation value and the second compensation value;
a compensation module to: and lightening the sub-pixels according to the target compensation value and the preset gray scale.
9. An electronic device comprising a memory and a processor, the memory storing a computer program operable on the processor, wherein the processor implements the method of any of claims 1 to 6 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 6.
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