CN100520499C - Align device of display element and its aligning method - Google Patents

Align device of display element and its aligning method Download PDF

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Publication number
CN100520499C
CN100520499C CNB200610108383XA CN200610108383A CN100520499C CN 100520499 C CN100520499 C CN 100520499C CN B200610108383X A CNB200610108383X A CN B200610108383XA CN 200610108383 A CN200610108383 A CN 200610108383A CN 100520499 C CN100520499 C CN 100520499C
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China
Prior art keywords
display device
image
pattern
calibrating
calibration
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CNB200610108383XA
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CN101055351A (en
Inventor
金成采
徐济玩
许瑛
卞胜健
金钉鹤
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/254—Projection of a pattern, viewing through a pattern, e.g. moiré
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features
    • G01N2021/8829—Shadow projection or structured background, e.g. for deflectometry
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136254—Checking; Testing

Abstract

The invention relates to calibration device containing LCD display element and the method thereof. The method comprises the steps: providing calibration pattern to the display element for detection; collecting the image of the calibration pattern for calibration. The object of the invention is to process calibration by the simple repeated image on the Short-circuit bar with the image detecting art in the display element production.

Description

The calibrating installation of display device and calibration steps thereof
Technical field
The present invention relates to comprise the calibrating installation and the calibration steps thereof of the display device of LCD, relate in particular to the calibrating installation and the calibration steps thereof of the display device that the pattern of the simple repetition of finishing in the short bar structure that can utilize the image quality characterization processes that can have short bar in the manufacturing process of display device calibrates.
Background technology
Recently, along with the epoch are developed into informationized society rapidly, demand to the flat-panel display device (FPD:Flat Panel Display) with excellent characteristics such as slimming, lightweight, low energy consumption has appearred, wherein, and liquid crystal display device (Liquid Crystal Display; Abbreviate LCD below as) owing to have outstanding sharpness, color demonstration, image quality etc., be widely used in the products such as notebook computer, left side display, portable terminal.
This LCD panel is made the attaching process of the technology of the upper plate of panel and lower plate, the formation of alignment film that is used for liquid crystal is carried out orientation and grinding (Rubbing) technology, upper plate and lower plate and is injected liquid crystal and the kinds of processes such as technology that seal are made between upper plate of fitting and lower plate when form constituting the liquid crystal cells of pixel (pixel) unit, because its assembly technology is various, all may produce defectives such as impurity, stain, fragmentation in any technology.
In order to check the defective of this LCD, comprise in the LCD manufacturing process and utilize optical devices to check technology at the image quality of the image quality of problem self-verifying liquid crystal cells such as image retention (image sticking), stain, dim spot, image quality is checked and is comprised the defective locations that is used to extract pixel in the technology and calibration (Calibration) process of calculating location information (image coordinate).
The device of the calibration process of the positional information between the existing electric coupling device that calculates liquid crystal cells and gathered (CCD) image as shown in Figure 1, this device comprises: the pattern generator 3 that the designed specific pattern of user is provided in order to check liquid crystal cells 1; Be used to gather the ccd video camera 5,7 of the photographic images of liquid crystal cells 1; Be used to handle the image processing part 9 of the image of being gathered; Detect the defects detection portion 11 of liquid crystal cells 1 defective by Flame Image Process; Extract the position extraction unit 13 of black matrix" (black matrix) positional information (defective locations) by Flame Image Process; Be used to control the control system 15 of the overall work of testing fixture; Be used for showing the display part 17 of the defective of the image gathered and detection to the user.
Usually, in order to carry out the calibration operation in the image quality inspection technology, the specific pattern that uses the user to design at calibration, and gather after these images with the relation between the positional information (image coordinate) in the positional information of designed pattern and the ccd image gathered as standard by ccd video camera 5,7.
At first, in order to check the defective of liquid crystal cells 1, calibration process between the ccd image that must carry out liquid crystal cells 1 and be gathered, but because this image quality checks that the user can not generate bright spot pattern etc. arbitrarily in the technology, therefore make utilize laser etc. generate the calibration unit of particular calibration pattern with physics mode.
Making the reason of calibrating with the unit is: check in the technology in the image quality of LCD manufacturing process to have short bar, then grid (Gate), data (Date) line are bundled in short bar (Shorting Bar, SB) on, thereby be limited in the pattern that can generate in the pattern generator 3.Cause only to utilize the pattern additional signal to make the pattern that is used to calibrate thus, therefore utilize laser etc. (for example to make the privileged site of LCD impaired usually with physics mode, at (100 * i, 100 * j) picture element generates high bright spot (highdot) with physics mode, here i, j are positive integer), thus the calibration unit that generates bright spot or specific pattern with physics mode made.The calibration of made can also reuse under the impaired situation not having with the unit in the future.
The calibration of made is put into testing fixture with the unit, in ccd video camera 5,7, gather the ccd image of calibration, and utilize the image of being gathered to calibrate with the unit.
Then, take out the LCD unit 1 that calibration is used to check with unit and input.At this moment, also impaired easily because calibration is subjected to small impact with the unit, so when taking care of, need many attentions in order to reuse in the future.
Then, pattern (the basic check pattern that is used for defect inspection that will be used to check defective by pattern generator 3, be known technology) offer LCD unit 1, and after the image by ccd video camera 5,7 shooting corresponding patterns, carry out Flame Image Process by image processing part 9 and extract defect information.
Utilize the defective of the particular value judgement LCD unit 1 of the defect information of being extracted, and show the defective of being judged to the user by display part 17.
But the image calibrating method of this existing LCD unit 1 because the user is subjected to generating arbitrarily the restriction of bright spot pattern etc., therefore need produce and generate the calibration unit of particular calibration pattern specially, makes work become loaded down with trivial details.
And, utilize laser on qualified unit, to generate the many defect points that are used to calibrate with informational needs in making calibration on the unit, in this process owing to site error, misoperation cause calibrating with the unit to be made into power very low, even and the alignment unit of made is subjected to very little impact and also might degenerates, therefore in keeping, need to add to note, and may damage information.
In addition, technologic former thereby need calibrate again the time because of the adjustment of device or the change of model of element etc., must end production technology the unit of made is put in the device again, the process of calibrating again, thereby very loaded down with trivial details on technology.
Summary of the invention
The present invention proposes in order to solve aforesaid problem, do not adopt when its purpose is a kind of the calibration is provided and utilize laser to generate the method for defect point, but utilize calibrating installation and the calibration steps thereof that to check the display device that the pattern of the simple repetition that realizes on the short bar structure of technology is calibrated in image quality with physics mode.
Another object of the present invention is to provide a kind of does not need to utilize laser etc. with the physics mode impairment unit, but can generate the calibrating installation and the calibration steps thereof of the display device of the pattern that can calibrate in present short bar structure.
Another object of the present invention is to provide the calibrating installation and the calibration steps thereof of the display device of the calibration process that a kind of initial stage that can be omitted in checking process drops into unit that makes for calibration and the complexity of calibrating in advance.
According to the image calibrating method of display device provided by the present invention, comprise step to achieve these goals: provide calibrating pattern with display device to checking; The image of the calibrating pattern provided is provided and is calibrated.
And, in the step of the described calibrating pattern of supply, be created on the calibrating pattern that to realize in the short bar structure, then the calibrating pattern that is generated is fed to and checks that using display device, this calibrating pattern is to check in the technology in the image quality that the display device manufacturing process that has short bar is comprised to generate.
And, described calibrating pattern in the manufacturing process of display device at for the image quality inspection by the repeat patterns that only inserts the grid striped that necessary signal generates on the gate line of short bar binding and the data line.
And described calibrating pattern is the pattern that is fed to display device, to be used to calculate the image gathered and the calibration information between the display device.
And, in described step of calibrating, at first gather and be fed to the image of checking with the calibrating pattern of display device, and the image of being gathered is calibrated and calculated the image of collection and the calibration information between the display device.
And the present invention also comprises step: the check pattern that is used to check defective to described inspection with the display device supply; The image of gathering the check pattern of being supplied carries out Flame Image Process; Detect the defect information of display device by Flame Image Process; Defect information that utilization is detected and calibration information extract the defects detection result of display device.
And the present invention also comprises step: the stripe pattern case that is used to extract defective locations to described inspection with the display device supply; The image of gathering the stripe pattern case of being supplied carries out Flame Image Process; Extract the defective locations information of display device by carrying out Flame Image Process; In conjunction with the defective locations information of being extracted and defects detection result and generate final defect information.
And, the flat-panel display device of described display device for driving with the matrix-style of gate line and data line as LCD, PDP, OLED etc.
And the image calibration device according to display device provided by the present invention is characterized in that comprising: pattern generator, to be used to generating calibrating pattern and to be fed to the inspection display device; Optical devices are to be used to gather the calibrating pattern of being supplied; Calibration portion is to be used for the image of being gathered is calibrated and calculate the image gathered and the calibration information between the display device.
And, described pattern generator is created on the calibrating pattern that can realize on the short bar structure, and be fed to and check and use display device that wherein, described pattern generator is checked this calibrating pattern of generation in the technology in the image quality that the display device manufacturing process that has short bar is comprised.
And described pattern generator generates the calibrating pattern of the repeat patterns of grid striped at only inserting necessary signal on gate line that is bundled by short bar for the image quality inspection and the data line in the manufacturing process of display device.
Description of drawings
Fig. 1 is the existing structured flowchart that carries out the image calibration device of LCD defect inspection;
Fig. 2 is the structured flowchart that carries out the image calibration device of LCD defect inspection provided by the present invention;
Fig. 3 is the detailed structure view that is used to generate calibrating pattern provided by the present invention;
Fig. 4 A and Fig. 4 B are the workflow diagram that is used to check the image calibrating method of LCD defective provided by the present invention;
Embodiment
Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 is the structured flowchart that carries out the image calibration device of LCD defect inspection provided by the present invention, and Fig. 3 is the detailed structure view that is used to generate calibrating pattern provided by the present invention.
As shown in Figure 2, the device that is used to carry out image calibration provided by the present invention comprises LCD unit 30, pattern generator 32, optical devices 34, image processing part 36, calibration portion 38, defects detection portion 40, position extraction unit 42, control system 44 and display part 46.
Described LCD unit 30 is the general display devices as the defect inspection object.
Though, the present invention with LCD unit 30 as display device one the example and describe, but display device of the present invention is not limited to LCD unit 30, but comprises all flat-panel display devices (FPD:Flat Panel Display) that PDP, OLED etc. drive in matrix (Matrix) mode of gate line (Gate Line) and data line (Data Line).
Described pattern generator 32 generates calibrating pattern, check pattern and stripe pattern case (Stripe pattern) according to the control of control system 44, to offer LCD unit 30.
Described calibrating pattern is the image gathered in order to calculate and the calibration information between the LCD unit 30 and offer the pattern of LCD unit 30, Even (E-GateLine)/Odd (O-Gate Line) to the gate line that bundlees by short bar connects voltage (0V, + Vdd) or (+Vdd, 0V) etc., and towards the R (R-Data Line) of data line, G (G-Data Line), B (B-Data Line) direction inserts signal to a pixel, thereby form pattern as shown in Figure 3 as the simple repetition of grid striped, the pattern of this simple repetition as calibrating pattern, is offered LCD unit 30.
Check pattern is the basic pattern that offers LCD unit 30 for the defect inspection of carrying out LCD unit 30, because this check pattern is the common pattern that uses when checking LCD unit 30 defectives, therefore omits its detailed description at this.
The stripe pattern case is the pattern that offers LCD unit 30 for the defective locations that extracts the LCD unit 30 of checking out defective (position of black matrix"), by continuing to insert signal to the R of data line (R-DataLine), G (G-Data Line), B (B-Data Line) direction, and Even (E-Gate the Line)/Odd (O-Gate Line) of gate line is connected voltage successively, thereby form the pattern of striated, and this pattern is offered LCD unit 30 as the stripe pattern case.
Described optical devices 34 are at least more than one ccd video cameras of gathering the LCD photographic images in order to check LCD unit 30, the ccd image that image processing part 36 overall treatments are gathered by optical devices 34 and output to described pattern generator 32 and calibration portion 38.
Described calibration portion 38 is in order to calculate the image gathered by optical devices 34 and the positional information (image coordinate) between the LCD unit 30, calibration information outputed to defects detection portion 40 by calibrating.
The defective of LCD unit 30 detects by the Flame Image Process of being undertaken by image processing part 36 in described defects detection portion 40, and utilizes the defects detection result and the calibration information that are detected that defective is finally classified.The defect information end value of finally classifying is output to control system 44, and is shown or the LCD unit 30 that detects defective is handled to the user by display part 46 by control system 44.
Described position extraction unit 42 is extracted the defective locations (black matrix" positional information) of the LCD unit 30 that detects defective by the Flame Image Process of being undertaken by image processing part 36, and generates final defect information in conjunction with the position information extraction and the defects detection result of the black matrix" that is extracted.The end value of the final defect information that generates is output to control system 44, and is shown or the defective locations of the LCD unit 30 that detects defective is handled to the user by display part 46 by control system 44.
44 pairs of described control system are provided by the present invention to be used to check that the molar behavior of the calibrating installation of LCD unit 30 defectives controls, and the black matrix" position information extraction of defects detection result by receiving the LCD unit of being checked by defects detection portion 40 30 and the LCD unit 30 that extracted by position extraction unit 42 outputs to display part 46.
Described display part 46 shows image and the defects detection result who is gathered according to the control signal of control system 44 to the user.
The following describes the calibrating installation of aforesaid display device and the operating process and the action effect of method thereof.
Fig. 4 A and Fig. 4 B are the workflow diagram that is used to check the image calibrating method of LCD defective provided by the present invention, gate line, data line are bundled in the present short bar structure of short bar in the manufacturing process of LCD unit 30, do not adopt the existing laser that utilizes to generate the method for defect point when calibrating, but utilize the pattern of the simple repetition that can realize by pattern generator 32 to carry out calibration operation with physics mode.
Shown in Fig. 4 A and Fig. 4 B, will put into (S50) in the device as the LCD unit 30 of defect inspection object, generate the calibrating pattern that is used to calibrate and offer LCD unit 30 (S52) at pattern generator 32.
At this moment, the calibrating pattern that offers LCD unit 30 is connected voltage (0V for Even (the E-GateLine)/Odd (O-Gate Line) by gate line, + Vdd) or (+Vdd, 0V) etc., and a pixel is inserted signal towards R (R-Data Line), the G (G-Data Line) of data line, B (B-Data Line) direction, thereby form pattern as shown in Figure 3, the pattern of this simple repetition as calibrating pattern, is offered LCD unit 30 as the simple repetition of grid striped.
Be fed to the image of the calibrating pattern of LCD unit 30 by optical devices 34 collection, calibrate at 38 pairs of images of gathering by optical devices 34 of calibration portion then.Therefore, calibration portion 38 is calculated as the image of gathering by optical devices 34 and the calibration information (S54) of the positional information (image coordinate) between the LCD unit 30.
Then, be used to check the check pattern of defective and offer LCD unit 30 (S56) in pattern generator 32 generations, and gather the image of the check pattern that offers LCD unit 30, and output to image processing part 36 (S58) by optical devices 34.
Therefore, the image of the check pattern that image processing part 36 overall treatments are gathered, and detect the defect information of checking with LCD unit 30 (S60) by the Flame Image Process of being undertaken by image processing part 36 in defects detection portion 40.
Described defects detection portion 40 utilizes defect information that is detected and the calibration information that calculates in described step S54 that defective is finally classified, and the end value of the defect information that will finally classify outputs to control system 44 (S62).
Thus, control system 44 finally judges whether LCD unit 30 exists defective (S64), if finally there is defective, then generates at pattern generator 32 and is used to extract the stripe pattern case of defective locations and offers LCD unit 30 (S66).
At this moment, the stripe pattern case that offers LCD unit 30 is by continuing to insert signal to the R of data line (R-DataLine), G (G-Data Line), B (B-Data Line) direction, and Even (E-Gate the Line)/Odd (O-Gate Line) of gate line is connected voltage successively, thereby form the pattern of striated, and this pattern is offered LCD unit 30 as the stripe pattern case.
Gather the image of the stripe pattern case that is fed to LCD unit 30 by optical devices 34, and output to image processing part 36 (S68).
Therefore, the image of the stripe pattern case that image processing part 36 overall treatments are gathered, and position extraction unit 42 extract by the Flame Image Process of being undertaken by image processing part 36 detect the LCD unit 30 of defective defective locations information (the position information extraction of black matrix", S70)
Extraction unit 42 binding deficient testing results in described position generate final defect information with the defective locations information of being extracted, and the end value of the defect information that will finally generate outputs to control system 44 (S72).
Thus, control system 44 shows final defect information by display part 46 to the user, thus the LCD unit 30 (S74) that the user can be handled detect defective.
In sum, calibrating installation and method thereof according to display device provided by the present invention, do not adopt the method for utilizing laser to generate defect point with physics mode when calibrating, but on the short bar structure of image quality inspection technology, utilize the pattern of the simple repetition that generates by pattern generator to calibrate, therefore need not on the unit, to make artificial calibrating pattern, and need not take care of the calibration unit specially.
And the initial stage that the present invention can be reduced at existing checking process is made the alignment unit that utilizes laser to generate bright spot artificially, and needs this alignment unit put into device when calibrating and the calibration process of the complexity of calibrating in advance at every turn.
Above-mentioned embodiment just is used to illustrate the calibrating installation of display device provided by the present invention and an embodiment of method thereof, the present invention is not limited to above-mentioned embodiment, under the situation that does not break away from the technology of the present invention thought, the worker with the common knowledge in the affiliated field of the present invention can carry out various changes.

Claims (11)

1, a kind of image calibrating method of display device is characterized in that comprising step:
Supply calibrating pattern to checking with display device;
Gather the image of the calibrating pattern supplied and calibrate.
2, the image calibrating method of display device according to claim 1, it is characterized in that in the step of described supply calibrating pattern, being created on the calibrating pattern that to realize in the short bar structure, then the calibrating pattern that is generated is fed to and checks that using display device, this calibrating pattern is to check in the technology in the image quality that the display device manufacturing process that has short bar is comprised to generate.
3, the image calibrating method of display device according to claim 2, it is characterized in that described calibrating pattern in the manufacturing process of display device at for the image quality inspection by the repeat patterns that only inserts the grid striped that necessary signal generates on the gate line of short bar binding and the data line.
4, the image calibrating method of display device according to claim 2 is characterized in that described calibrating pattern is the pattern that is fed to display device, to be used to calculate the image gathered and the calibration information between the display device.
5, the image calibrating method of display device according to claim 1, it is characterized in that, in described step of calibrating, at first gather and be fed to the image of checking with the calibrating pattern of display device, then the image of being gathered is calibrated and calculated the image of collection and the calibration information between the display device.
6, the image calibrating method of display device according to claim 1 is characterized in that also comprising step:
The check pattern that is used to check defective to described inspection with the display device supply;
The image of gathering the check pattern of being supplied carries out Flame Image Process;
Detect the defect information of display device by Flame Image Process;
Defect information that utilization is detected and calibration information extract the defects detection result of display device.
7, the image calibrating method of display device according to claim 6 is characterized in that also comprising step:
The stripe pattern case that is used to extract defective locations to described inspection with the display device supply;
The image of gathering the stripe pattern case of being supplied carries out Flame Image Process;
Extract the defective locations information of display device by carrying out Flame Image Process;
In conjunction with the defective locations information of being extracted and defects detection result and generate final defect information.
8,, it is characterized in that the flat-panel display device that described display device drives for the matrix-style with gate line and data line according to the image calibrating method of any described display device in the claim 1 to 7.
9, a kind of image calibration device of display device is characterized in that comprising:
Pattern generator is to be used to generating calibrating pattern and to be fed to the inspection display device;
Optical devices are to be used to gather the image of the calibrating pattern of being supplied;
Calibration portion is to be used for the image of being gathered is calibrated and calculate the image gathered and the calibration information between the display device.
10, the calibrating installation of display device according to claim 9, it is characterized in that described pattern generator is created on the calibrating pattern that can realize in the short bar structure, and be fed to and check and to use display device, wherein, described pattern generator is checked in the image quality that the display device manufacturing process that has short bar is comprised and is generated this calibrating pattern in the technology.
11, the calibrating installation of display device according to claim 9 is characterized in that described pattern generator generates the calibrating pattern of the repeat patterns of grid striped at only inserting necessary signal on gate line that is bundled by short bar for the image quality inspection and the data line in the manufacturing process of display device.
CNB200610108383XA 2006-04-14 2006-08-03 Align device of display element and its aligning method Active CN100520499C (en)

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KR101426487B1 (en) * 2008-01-02 2014-08-06 삼성전자주식회사 Apparatus for inspecting of display panel and method thereof
KR102009740B1 (en) * 2012-12-07 2019-08-13 엘지디스플레이 주식회사 Apparatus for inspecting of display panel and method thereof
WO2022150986A1 (en) * 2021-01-12 2022-07-21 深圳市艾比森光电股份有限公司 Image quality inspection method and related product for led display screen

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