CN111491070B - Display panel multi-view angle equalization Demura method and terminal equipment - Google Patents
Display panel multi-view angle equalization Demura method and terminal equipment Download PDFInfo
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Abstract
The invention discloses a display panel multi-view angle equalization Demura method and terminal equipment, wherein the method comprises the following steps: acquiring shot display images of a display panel shot by a camera under a plurality of different visual angles, and respectively calculating the Demura values of the shot images under the different visual angles; dividing a display image into a plurality of shaking blocks, wherein the number of pixel points in each shaking block is not less than the number of visual angles, and the driving values of the pixel points are different; calculating a driving compensation value of each pixel point of the same shaking block in display images under different viewing angles based on gamma curves of the display panels under different viewing angles by taking each shaking block as a minimum unit, and fusing the Demura values of the shot images under different viewing angles to obtain a multi-view fused restoration value; compensating the driving value of the pixel according to the repair value; according to the invention, the Demura restoration values of multiple visual angles are modulated together in an ordered shaking manner, the generated driving compensation value can meet the Demura requirements of multiple different visual angles, and the blank of the multi-visual angle Demura field is filled.
Description
Technical Field
The invention belongs to the technical field of image processing, and particularly relates to a display panel multi-view angle equalization Demura method and terminal equipment.
Background
With the increasing social demand, display technologies are rapidly developing. The small-area display screens such as mobile phones and tablet computers originally use LCD screens and are basically replaced by OLED screens at present, and Micro LEDs as a new generation display technology have higher brightness, better luminous efficiency and lower power consumption compared with the existing OLED technology. At present, micro led products with large size and large resolution are already available, the finished products of the display screens need to ensure that no defects or defects within an allowable range can flow into the market, and due to the complexity and difficulty of the display screen production process, the occurrence of Mura defects cannot be avoided, but the Mura defects bring visual discomfort and seriously affect the quality of the display screens, so that the Mura defects must be repaired, namely, the Demura technology is applied.
It is well known that LCD/OLED displays have viewing angle dependence, such that the gamma curve of the display varies with viewing angle. However, most of the existing Demura techniques are only completed with a single viewing angle, for example, with a front viewing angle perpendicular to the display, and the Demura compensation value is derived based on a single gamma curve, so that the Mura defect is greatly improved when the current viewing angle is viewed, but the Mura defect is still serious when the corrected display screen is viewed from other angles; the existing Demura scheme cannot eliminate the visual angle difference, so that the overall effect of Demura is poor.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides a display panel multi-view angle equalization Demura method and terminal equipment, and aims to solve the problem that the existing single-view angle Demura technology cannot improve the Mura defects of other different view angles.
To achieve the above object, according to a first aspect of the present invention, there is provided a display panel multi-view equalizing Demura method, comprising:
the method comprises the steps of obtaining display images of a display panel shot by a camera under a plurality of different visual angles, dividing the display images into a plurality of shaking blocks, wherein the number of pixel points in each shaking block is not less than the number of the visual angles, and the driving values of the pixel points are unequal;
calculating a driving compensation value of each pixel point of the same shaking block in display images under different visual angles based on gamma curves of the display panels under different visual angles by taking each shaking block as a minimum unit to obtain a restoration value after multi-visual angle fusion;
and compensating the driving value of the pixel according to the repair value.
Preferably, the above display panel multi-view equalization Demura method further comprises, before the capturing images of the camera at a plurality of different viewing angles,
setting a dithering template, generating a pixel driving value matrix according to the dithering template, and lighting a display panel by using the pixel driving value matrix.
Preferably, in the above display panel multi-view equalizing Demura method, the calculating the driving compensation value of each dither block in the display image based on the gamma curves of the display panel at different viewing angles includes:
respectively calculating the Demura values of the display images under different viewing angles;
respectively obtaining the brightness values of the same shaking block in the display images under different visual angles after screen dotting;
and calculating a driving compensation value of each pixel point in each shaking block according to the gamma value of the display panel corresponding to each shaking block at different visual angles, the brightness value and the Demura value of the shot image of each shaking block at different visual angles, and taking the driving compensation value as a restoration value after multi-visual-angle fusion is carried out on the pixel point.
Preferably, in the above display panel multi-view equalization Demura method, generating a pixel driving value matrix according to the dither template is:
and dithering the driving values of all the pixel points in any dithering block according to a preset dithering amplitude so as to enable the driving values applied to all the pixel points to be different from each other.
Preferably, in the above display panel multi-view equalizing Demura method, dithering the driving value of each pixel point in any one dither block according to a preset dither amplitude specifically includes:
and setting the driving values of other pixels according to a preset shaking amplitude by taking the driving value of any pixel point in the shaking block as a reference value, so that the driving average value of each shaking block before and after shaking is unchanged.
Preferably, in the above display panel multi-view equalizing Demura method, the manner of calculating the driving compensation value of each pixel point in the dither block is as follows:
calculating a slope matrix according to the driving value of each pixel point in the shaking block, the gamma curve of the display panel corresponding to different visual angles and the brightness value of the shaking block in the shot image under different visual angles, wherein the value of the slope matrix is the derivative of the gamma curve corresponding to each pixel point in the shaking block under each visual angle;
and calculating the driving compensation value of the corresponding pixel point according to the slope matrix and the Demura value of the shot image of any pixel point in the shaking block under different visual angles.
Preferably, in the above display panel multi-view equalization Demura method, the slope matrix is an n × m-order matrix, where n denotes the number of views, m denotes the number of pixels in the dither block, and m is greater than or equal to n.
Preferably, the above display panel multi-view equalization Demura method determines the dithering amplitude according to the resolution of the display panel.
Preferably, the above display panel multi-view equalizing Demura method further includes: and burning the multi-view fused restoration value corresponding to each pixel into a memory of the display panel.
According to a second aspect of the present invention, a terminal device is provided, comprising at least one processing unit, and at least one memory unit, wherein the memory unit stores a computer program that, when executed by the processing unit, causes the processing unit to perform the steps of any of the above-mentioned methods.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the display panel multi-view angle equalization Demura method provided by the invention is different from the existing single-view angle Demura, the control parameters of each single pixel point in a shaking block are increased by constructing the shaking block in an orderly shaking mode, the driving compensation value of the corresponding pixel point is calculated according to the driving value of each pixel point in each shaking block, the gamma curve of the display panel corresponding to different view angles, the brightness value of the image shot by each shaking block under different view angles and the Demura value of the image shot by any one pixel point in the shaking block under different view angles, and the driving compensation value is fused with the Demura values of a plurality of different view angles; experiments prove that after the brightness compensation is carried out on the display panel based on the driving compensation value, compensated pictures are shot again at a plurality of different visual angles and Mura detection is carried out again, and Mura defects at different visual angles are well improved; the invention modulates the restoration values of a plurality of visual angles together, and fills the blank of the field of multi-visual angle Demura.
Drawings
FIG. 1 is a flow chart of a multi-view equalization Demura method for a display panel according to the present invention;
FIG. 2 is a flow chart of a preferred display panel multi-view equalization Demura method according to an embodiment of the present invention;
fig. 3 is a flowchart of a preferred method for equalizing Demura in multiple viewing angles of a display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
FIG. 1 is a flowchart of a display panel multi-view equalizing Demura method provided by the present invention, which fuses Demura values of shot images at different viewing angles in an ordered dithering manner; referring to fig. 1, the method specifically comprises the following steps:
s1: the method comprises the steps of obtaining display images of a display panel shot by a camera under a plurality of different visual angles, dividing the display images into a plurality of shaking blocks, wherein the number of pixel points in each shaking block is not less than the number of the visual angles, and the driving values of the pixel points are unequal;
firstly, shooting a lighted display panel to be detected at a plurality of different viewing angles by using a plurality of cameras (or the same camera) respectively to obtain a display image; the display image may be a grayscale image, or may be a monochrome image such as R, G, B, and is not particularly limited;
in this embodiment, the pixel points in the display image are divided into a plurality of dither blocks, and each dither block includes a plurality of adjacent pixel points; the number of the pixel points in each shaking block is not less than the number of the visual angles, and is at least equal to the number of the visual angles to be fused, and the brightness values of the pixel points in each shaking block are different from each other;
for a single pixel, only one Demura value is used as a control parameter, and a single Demura value cannot be found to meet the Demura requirements of a plurality of different viewing angles; since the resolution of the display is very high, the human eye cannot perceive fine variations between adjacent pixels. Therefore, the invention increases the control parameters of a single pixel by constructing a dither block, which is a trade-off between spatial resolution and more control parameters; for example: if Demura compensation for a single pixel is performed using one dither block composed of 3 pixels, one dither block has three Demura values that can theoretically satisfy three different viewing angles, and thus the number of pixels in each dither block cannot be less than the number of viewing angles.
As a preferred example, this embodiment further provides a way to light up the display panel and ensure that the driving values of the pixels in the same dither block are not equal, and with reference to fig. 2, the method specifically includes:
setting a dithering template, generating a pixel driving value matrix according to the dithering template, and lighting a display panel by using the pixel driving value matrix; wherein, the pixel driving value matrix generated according to the dither template is:
dithering the driving values of all pixel points in any dithering block according to a preset dithering amplitude so as to enable the driving values applied to all the pixel points to be different from each other; specifically, the driving value of any pixel point in the dither block is used as a reference value, and the driving values of other pixels are set according to a preset dither amplitude, so that the driving average value of each dither block before and after dithering is kept unchanged.
In a shaking block with three pixel points, the driving value of one pixel point is used as a reference value, the driving value of a first adjacent pixel point is set according to the shaking amplitude, and then the driving value of a second pixel point can be derived according to the driving average value. In this embodiment, the value of the jitter amplitude depends on the resolution of the display panel, and if the resolution of the panel is not high enough, a large jitter amplitude may cause visible jitter artifacts; therefore, the larger the jitter amplitude is, the better the jitter amplitude is set on the premise of ensuring that the display panel does not have obvious jitter artifacts.
One possible dither mask provided by this embodiment is as follows (only some of the pixel driving values are shown):
d1 0 d2 d1 0 d2 d1 0 d2 d1 0 d2 d1 0 d2
d2 0 d1 0 d2 d1 0 d2 d1 0 d2 d1 0 d2 0
d1 0 d2 d1 0 d2 d1 0 d2 d1 0 d2 d1 0 d2
d2 0 d1 0 d2 d1 0 d2 d1 0 d2 d1 0 d2 0
in the dither template, every 1 × 3 pixel points (i.e. 3 adjacent pixel points in the same row) form a dither block; certainly, the arrangement mode of the pixels in the dither block is not limited to 1 × 3, and for example, 3 × 1 pixels may be used to construct a dither block; taking the driving values of the first 3 pixels in the first row as an example, assuming that the driving value of the second pixel is 0 and the jitter amplitude is d1, the driving value of the first pixel is d1, and once d1 is determined, the driving value d2 of the third pixel can be derived to maintain the block average. It should be noted that the dither mask is only used to show the relative relationship between the driving values of the pixels in each dither block, and the driving value of each pixel is not limited to the specific value given in the dither mask. Of course, the above-mentioned dither masks are only illustrative examples, and dither masks having other arrangements are also possible.
S2: calculating a driving compensation value of each pixel point of the same shaking block in display images under different visual angles based on gamma curves of the display panels under different visual angles by taking each shaking block as a minimum unit to obtain a restoration value after multi-visual angle fusion;
in this embodiment, the driving compensation value of the same dither block in the display image at different viewing angles is calculated by using the dither block including three pixel points as a unit; in the calculation process, the Demura values of each pixel point under different visual angles are required to be used, and for one pixel point, the corresponding drive compensation value is equivalent to the fusion of optical data of three pixel points under three different visual angles; therefore, the driving compensation value calculated by the embodiment can meet the demand of Demura at three different viewing angles.
Referring to fig. 3, the calculating the driving compensation value of each dither block in the display image based on the gamma curves of the display panel under different viewing angles specifically includes:
respectively calculating the Demura values of the display images under different viewing angles; after display images at different viewing angles shot by a camera are acquired, Demura values at different viewing angles are calculated by adopting a Demura compensation method, the Demura compensation method can be realized by adopting the existing compensation method, and the embodiment does not specifically limit the Demura compensation method.
Respectively obtaining the brightness values of the same shaking block in the display images under different visual angles after screen dotting; in this embodiment, the luminance value is the sum of luminance values of each pixel point in the display image of the dithering block at different viewing angles;
calculating a driving compensation value of each pixel point in each shaking block according to a gamma value of a display panel corresponding to each shaking block at different visual angles, a brightness value of a shot image of each shaking block at different visual angles and a Demura value, and taking the driving compensation value as a restoration value after multi-visual-angle fusion of the pixel point; specifically, the method comprises the following steps:
firstly, calculating a slope matrix according to a driving value of each pixel point in a shaking block, a gamma curve of a display panel corresponding to different visual angles and a brightness value of the shaking block in a shot image under different visual angles, wherein the slope matrix is an n multiplied by m-order matrix, n represents the number of the visual angles, m represents the number of pixels in the shaking block, and m is more than or equal to n; the value of the slope matrix is the derivative of a gamma curve corresponding to each pixel point in the shaking block under each visual angle;
and then, calculating the driving compensation value of the corresponding pixel point according to the slope matrix and the Demura value of the shot image of any one pixel point in the shaking block under different visual angles.
S3: and compensating the driving value of each pixel in the display panel according to the repair value.
The following explains the implementation principle of the present invention by taking three different viewing angles and three pixels of a dither block as a specific example, and combining with the mathematical principle.
Assuming three different camera viewing angles (theta 1, theta 2 and theta 3) corresponding to three Demura values (delta 1, delta 2 and delta 3) obtained according to the Demura compensation algorithm; the respective driving values (d 1, d2, d 3) of three pixels in a dither block can be solved for 3 equations and 3 unknowns:
wherein the content of the first and second substances,
the gamma curve representing the display screen at the visual angle theta of the camera can be obtained by a Demura compensation algorithm; b1, B2, and B3 are luminance values in a display image of the same dither block at different viewing angles, respectively; in one example, B1 is the sum of luminance values of three pixels in the display image of the dither block at the viewing angle θ 1;
the above equation is approximated by a first order Taylor expansion, having:
the left side is the derivative of the gamma curve and we refer to the left 3 x 3 matrix as the slope matrix.
Assuming that the gamma curve is a power function with an exponent of 2.2, the derivative of the gamma curve is: g' =2.2d^ 1.2；
If d1 = d2 = d3, then G θ' is the same in all three views, since the left matrix rank is 1, so there is no solution. Fortunately, however, the gamma curve depends on the viewing angle and the determinant of the slope matrix can be increased by selectively manipulating d1, d2, d3 to make the solution more stable.
Since the gamma values for different viewing angles are similar, the values in the slope matrix are also similar, resulting in the slope matrix being likely to be a singular matrix. Since the gamma slope is proportional to the gray level having the gamma function (gamma > 1), it is necessary to diversify the gray level of each pixel in the dither block in order to make it non-singular, and thus, the dither process is performed on the driving value of each pixel in the dither block.
After gamma curves of the display panel corresponding to different visual angles and brightness values (B1, B2 and B3) of the dither block in display images under different visual angles are determined, a slope matrix can be calculated, and based on a formula (1), a driving compensation value corresponding to each pixel point in the dither block can be calculated based on Demura values (delta 1, delta 2 and delta 3) corresponding to different visual angles
(ii) a The driving compensation value is a Demura value satisfying three viewing angles (θ 1, θ 2, θ 3).
For example: the Demura values (delta 1, delta 2, delta 3) corresponding to three different camera viewing angles (theta 1, theta 2, theta 3) are [ -1.00.0-0.5 ], after the driving values of three pixels in the dither block are dithered, the brightness value of the dither block in the display image under the different viewing angles (theta 1, theta 2, theta 3) is [ 146487 ], and the gamma values of the display screen gamma curves under the three different camera viewing angles (theta 1, theta 2, theta 3) are [ 1.502.201.80 respectively, and the Demura values are calculated based on the formula (1):
according to the result of the calculation,
the =0.4 is the driving compensation value of the first pixel point satisfying three different viewing angles (θ 1, θ 2, θ 3).
Respectively calculating the corresponding driving compensation value of each pixel point according to the method
And burning the multi-view-angle balanced Demura values corresponding to the pixel points into a Flash ROM of the display panel.
The present embodiment further provides a terminal device, which includes at least one processor and at least one memory, where the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the display panel multi-view equalization Demura method, where the specific steps refer to embodiment one and are not described herein again; in this embodiment, the types of the processor and the memory are not particularly limited, for example: the processor may be a microprocessor, digital information processor, on-chip programmable logic system, or the like; the memory may be volatile memory, non-volatile memory, a combination thereof, or the like.
The terminal device may also communicate with one or more external devices (e.g., keyboard, pointing terminal, display, etc.), with one or more terminals that enable a user to interact with the terminal device, and/or with any terminals (e.g., network card, modem, etc.) that enable the terminal device to communicate with one or more other computing terminals. Such communication may be through an input/output (I/O) interface. Furthermore, the terminal device may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public Network such as the internet) via the Network adapter.
The present embodiment also provides a computer readable medium, which stores a computer program executable by a terminal device, and when the computer program runs on the terminal device, the terminal device is caused to execute the steps of the above-mentioned display panel multi-view equalization Demura method. Types of computer readable media include, but are not limited to, storage media such as SD cards, usb disks, fixed hard disks, removable hard disks, and the like.
It should be noted that, for simplicity of description, the above-mentioned method embodiments or examples are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts described, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments or examples described in this specification are presently preferred, and that the acts and modules illustrated are not necessarily required to practice the invention.
Compared with the existing single-view Demura, the display panel multi-view balanced Demura mode provided by the invention overcomes the problem that the single-view Demura technology cannot improve the Mura defects of other different views, modulates the Demura restoration values of multiple views together based on an ordered jitter mode, and fills the blank in the field of multi-view Demura.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A display panel multi-view angle equalization Demura method is characterized by comprising the following steps:
the method comprises the steps of obtaining display images of a display panel shot by a camera under a plurality of different visual angles, dividing the display images into a plurality of shaking blocks, wherein the number of pixel points in each shaking block is not less than the number of the visual angles, and the driving values of the pixel points are unequal;
calculating a driving compensation value of each pixel point of each shaking block by taking each shaking block as a minimum unit according to a gamma value of a corresponding display panel under different visual angles, a brightness value of each shaking block in a shot image under different visual angles and a Demura value, and taking the driving compensation value as a restoration value after multi-visual angle fusion; the brightness value is the sum of the brightness of each pixel point in the shaking block;
and compensating the driving value of the pixel according to the repair value.
2. The method for multi-view equalizing Demura of claim 1, wherein said capturing display images of a display panel taken by a camera at a plurality of different views further comprises,
and generating a pixel driving value matrix according to a pre-configured dithering template, and lighting up the display panel by using the pixel driving value matrix.
3. The method for multi-view equalization Demura of a display panel according to claim 2, wherein said generating a matrix of pixel drive values according to a preconfigured dither mask is:
and dithering the driving values of all the pixel points in any dithering block according to a preset dithering amplitude so as to enable the driving values applied to all the pixel points to be different from each other.
4. The multi-view equalizing Demura method of claim 3, wherein dithering the driving values of the pixels in any one of the dithering blocks according to a preset dithering amplitude is specifically:
and setting the driving values of other pixels according to a preset shaking amplitude by taking the driving value of any pixel point in the shaking block as a reference value, so that the driving average value of each shaking block before and after shaking is unchanged.
5. The method for multi-view equalization Demura of a display panel according to claim 1, wherein the calculation of the driving compensation value of each pixel in the dither block is performed by:
calculating a slope matrix according to the driving value of each pixel point in the shaking block, the gamma curve of the display panel corresponding to different visual angles and the brightness value of the shaking block in the shot image under different visual angles, wherein the value of the slope matrix is the derivative of the gamma curve corresponding to each pixel point in the shaking block under each visual angle;
and calculating the driving compensation value of the corresponding pixel point according to the slope matrix and the Demura value of the shot image of any pixel point in the shaking block under different visual angles.
6. The multi-view equalizing Demura method of claim 3, wherein the dithering amplitude is determined according to a resolution of the display panel.
7. The multi-view equalizing Demura method of claim 1, further comprising: and burning the multi-view fused restoration value corresponding to each pixel into a memory of the display panel.
8. The method as claimed in claim 5, wherein the slope matrix is an n x m matrix, where n represents the number of views, m represents the number of pixels in the dither block, and m ≧ n.
9. A terminal device, comprising at least one processing unit and at least one memory unit, wherein the memory unit stores a computer program which, when executed by the processing unit, causes the processing unit to carry out the steps of the method according to any one of claims 1 to 8.
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| CN109377935A (en) * | 2018-12-10 | 2019-02-22 | 京东方科技集团股份有限公司 | Luminance compensation method, device and electro-luminescence display device |
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