CN108986721B - Detection graph generation method for display panel detection - Google Patents
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- 238000010586 diagram Methods 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 3
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G06T7/13—Edge detection
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
- G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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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
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20021—Dividing image into blocks, subimages or windows
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- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20112—Image segmentation details
- G06T2207/20164—Salient point detection; Corner detection
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- G06T2207/30108—Industrial image inspection
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Abstract
The invention discloses a detection graph generation method for display panel detection, which comprises the following steps: (1) taking blocks of size x y in a graph of resolution a x B; (2) dividing the x y blocks into a plurality of small blocks with the size of M x N; (3) alternately filling the divided multiple M x N small blocks with two different colors, namely a first color and a second color; (4) taking the size K at the center of each small block with the size of M x N1*K2A block of (a); (5) at each size of K1*K2The block of (b) is filled with a third color; (6) at each size of K1*K2One pixel point is taken from the block, and the fourth color is filled to form a detection graph; the detection image generated by the method provided by the invention is used for detecting the panel, so that the detection requirement of the special-shaped screen can be better adapted; and because smaller detection area and block center area pixel points are added on the basis of the checkerboard image corner points, points and colors for subsequent detection and judgment are richer, and the positioning accuracy can be further improved for panel detection.
Description
Technical Field
The invention belongs to the technical field of display panel detection, and particularly relates to a detection graph generation method for display panel detection.
Background
Due to different materials, production processes and the like, the display panel has undesirable defects after production, such as Mura. The defects of the display panel cannot be detected by human eyes to meet the production requirement, and image capture analysis needs to be carried out by means of third-party equipment such as a CCD (charge coupled device) camera and the like. The first step of image capture analysis is positioning, which means determining the display area of the display panel on the CCD and confirming the specific position of each sub-pixel (sub pix) in the CCD, so as to obtain the characteristic that each sub-pixel (sub pix) presents on the CCD, and a detection graph is needed in the positioning process.
Most of the current equipment manufacturers adopt checkerboard detection patterns as shown in fig. 1. For example, chinese patent CN201410328879 also discloses a method for generating checkerboard picture components of any order based on FPGA, and by using the method, checkerboard picture components of any order can be generated. However, because the checkerboard picture is used as a detection graph for positioning, the detection is mainly based on the angular point (the point marked by the circle in fig. 1 is called the angular point), and the identification and positioning of the angular point are realized by using the local gray characteristic of the angular point in the checkerboard picture and the structural characteristic formed by the grids; the panel detection of LCD, LED, OLED, etc. by corner detection has the disadvantage that only ROI (i.e. the detection area of the display panel on the CCD) can be roughly confirmed, and the detection precision is low. In the actual panel detection process, the sub-pixels of the display panel on the CCD need to be positioned, and the checkerboard detection pattern cannot meet the positioning requirement of the sub-pixel level.
Disclosure of Invention
In view of the above drawbacks or needs for improvement in the prior art, the present invention provides a method for generating a detection pattern for display panel detection, which aims to generate a detection pattern that satisfies the positioning requirements at the sub-pixel level, so that CCD can be accurately and rapidly positioned after image capture.
To achieve the above object, according to one aspect of the present invention, there is provided a detection pattern generating method for display panel detection, comprising the steps of:
(1) taking blocks of size x y in a graph of resolution a x B;
(2) dividing the x y blocks into a plurality of small blocks with the size of M x N;
(3) alternately filling the divided multiple M x N small blocks with two different colors, namely a first color and a second color;
(4) taking the size K at the center of each small block with the size of M x N1*K2A block of (a);
(5) at each size of K1*K2Is filled withThree colors;
(6) at each size of K1*K2One pixel point T is taken from the block1And filling the fourth color to form a detection pattern.
Preferably, in the detection pattern generating method for detecting a display panel, x × y is a × B.
Preferably, the above detection pattern generation method for display panel detection, wherein K1*K2Is M N/2.
Preferably, the third color of the detection pattern generation method for display panel detection is the same as the second color.
Preferably, in the detection pattern generating method for detecting a display panel, the pixel point selected in step (6) has a size of K1*K2The center point of the block.
Preferably, the detection pattern generating method for detecting a display panel is further configured such that the fourth color is the same as the first color.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the invention provides a detection graph generation method for display panel detection, wherein a generated detection image is an improvement on the basis of the existing checkerboard detection image, and areas are further subdivided on the basis of checkerboard division, and color filling is further distinguished; when the panel is detected by adopting the existing checkerboard-shaped detection image, the checkerboard is required to fill the whole panel; the method of the invention limits the blocks with the size of x y in the graph with the resolution of A x B, so that the detection graph generated by the method of the invention is used for detecting the panel without the limitation of 'needing to fill the whole panel', and the method can be better suitable for detecting special-shaped screens, such as Liuhai screens, such as iphoneX, round-corner screens and the like;
(2) the detection based on the angular points by utilizing the existing checkerboard pattern can only detect the approximate area of the panel in the CCD, and can not judge and correct the detected angular point data, so the error is larger; following the division of the display panelThe resolution is higher and higher, a single sub-pixel is smaller and smaller, and the requirement on the detection precision of the display panel is higher and higher; the detection graph generated by the method provided by the invention is displayed by a panel to be detected, a picture is obtained by CCD shooting, and the central point T can be extracted1With all corner points T2Position, and calculating to obtain the theoretical center point T3A location; according to T1And T3Can determine the corner point T2The position accuracy is achieved, and meanwhile, distortion correction and fine adjustment are performed on the position of each supbpix on the CCD, so that the positioning accuracy of the liquid crystal module on the CCD graph is improved; therefore, the detection pattern generated by the method meets the positioning requirement of the sub-pixel level, the CCD can be accurately and quickly positioned after image capture by adopting the detection pattern, and the detection precision of panel detection can be further improved.
Drawings
FIG. 1 is a schematic diagram of a checkerboard detection pattern provided by the prior art;
FIG. 2 is a flow chart of a detection graph generation method provided by the present invention;
FIG. 3 is a schematic diagram of a test image generated by the test pattern generation method provided by the embodiment;
FIG. 4 is another schematic diagram of a test image generated by the test pattern generation method provided by the embodiment;
FIG. 5 is a schematic flow chart of OLED panel inspection using the inspection pattern generated by the method provided by the embodiment;
FIG. 6 is a schematic diagram illustrating the effect of detecting the OLED panel by using the detection pattern generated by the method provided by the embodiment.
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.
The flow of an embodiment of the detection pattern generation method for display panel detection provided by the invention, referring to fig. 2, specifically includes the following steps:
step (1): taking blocks of size x y in a graph of resolution a x B;
step (2): dividing the x y blocks into a plurality of small blocks with the size of M x N;
and (3): alternately filling the divided multiple M x N small blocks with two different colors, namely a first color and a second color;
and (4): taking the size K at the center of each small block with the size of M x N1*K2A block of (a);
and (5): at each size of K1*K2The block of (b) is filled with a third color;
and (6): at each size of K1*K2One pixel point T is taken from the block1And filling the fourth color to form a final detection pattern.
In practical applications, the resolution parameters a × B, the block sizes x × y, M × N, and K1 × K2 may be adapted according to the characteristics of the module to be tested.
For example, in an embodiment, if the module to be tested is an OLED screen, the above parameters are taken as: a × B ═ 720 × 2160, x × y ═ 720 × 2160, M × N ═ 30 × 60, K1 × K2 ═ 15 × 30.
In another example, if the module to be tested is an LCD, the above parameters are taken as: a, B, x, y, 3840, 2160, M, N, 60, K1, K2, 30.
In practical applications, the first color, the second color, the third color and the fourth color may be set to be red, black and red in sequence; or green, black and green in sequence; or blue, black and blue in sequence; or white, black and white in sequence.
Preferably, the second color and the third color may be set to be the same, and the first color and the fourth color may be set to be the same. Referring to fig. 4, the detection image thus generated has two actual imagesA plurality of different colors; in the detection graph, a plurality of partitions with the size of M x N are arranged in each block with the size of x y in the unit with the size of A x B, and the partitions are alternately filled with two different colors; the partitions with the size of M x N are divided into partitions with the size of K1*K2The pixel points are re-imaged in the small blocks; when the pattern is adopted to detect the liquid crystal panel, the LCD panel and the OLED panel, the detected pattern is displayed through the panel to be detected, and the image displayed by the panel to be detected is shot through the CCD to obtain a picture; the brightness of some sub-pixels of the image acquired on the CCD is high, the brightness of some sub-pixels is low, and the comparison is obvious, so that the data analysis is facilitated.
Referring to fig. 3 and 4, the detection image generated by the detection pattern generation method according to the embodiment is shown. The process of using the detection image for detecting the LCD, OLED and liquid crystal panel refers to fig. 5, which specifically includes the following steps:
(1) outputting the generated detection image to a panel to be detected through a graphic signal generator for displaying;
(2) collecting an image displayed by a panel to be detected through a CCD;
(3) and performing positioning analysis according to the image acquired by the CCD, and accurately positioning the position of the sub-pixel on the panel to be detected on the CCD.
Referring to fig. 6, wherein the symbols "o", "+", "x", and "Δ" indicate the specific location of each of the subapixs on the CCD picture, respectively; the figure shows that the detection pattern generated by the method can realize the accurate positioning of each supbpix on the CCD pattern on the liquid crystal module.
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 (10)
1. A detection pattern generation method for display panel detection is characterized by comprising the following steps:
(1) taking blocks of size x y in a graph of resolution a x B;
(2) dividing the x y sized blocks into a plurality of M x N sized tiles;
(3) alternately filling colors of the divided small blocks of M x N by adopting a first color and a second color;
(4) taking a patch of size K1 × K2 in the center of each said M × N-sized patch;
(5) filling each of the tiles of size K1 × K2 with a third color;
(6) and taking a pixel point from each block with the size of K1 × K2, and filling a fourth color to form a detection graph.
2. The test pattern generation method according to claim 1, wherein the block size x y taken in step (1) is a x B.
3. The test pattern generation method according to claim 1 or 2, wherein the block size K1 × K2 taken in the step (4) is (M/2) × (N/2).
4. The detection pattern generation method according to claim 1 or 2, wherein the third color is the same as the second color.
5. The detection pattern generation method according to claim 1 or 2, wherein the pixel point selected in the step (6) is a center point of a block having a size of K1 × K2.
6. The detection pattern generation method according to claim 1 or 2, wherein the fourth color is the same as the first color.
7. The detection pattern generation method according to claim 1 or 2, wherein the first color, the second color, the third color, and the fourth color are set such that:
red, black and red in sequence;
or green, black and green in sequence;
or blue, black and blue in sequence;
or white, black and white in sequence.
8. The detection pattern generation method according to claim 1 or 2, wherein for a module to be tested of the type OLED screen, the parameter values are preferably: a × B ═ 720 × 2160, x × y ═ 720 × 2160, M × N ═ 30 × 60, K1 × K2 ═ 15 × 30.
9. The detection pattern generation method of claim 1 or 2, wherein for a module to be tested of the type LCD, the parameter values are preferably: a, B, x, y, 3840, 2160, M, N, 60, K1, K2, 30.
10. A test pattern for display panel testing generated by the test pattern generation method according to any one of claims 1 to 9.
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| CN109509200B (en) * | 2018-12-26 | 2023-09-29 | 深圳市繁维医疗科技有限公司 | Checkerboard corner detection method based on contour extraction and computer readable storage medium |
| CN110796974A (en) * | 2019-11-01 | 2020-02-14 | 深圳同兴达科技股份有限公司 | Display screen detection method |
| CN110855898B (en) * | 2020-01-14 | 2020-07-31 | 武汉精立电子技术有限公司 | Image acquisition method and device |
| CN111882530B (en) * | 2020-07-15 | 2024-05-14 | 苏州佳智彩光电科技有限公司 | Sub-pixel positioning map generation method, positioning method and device |
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