CN106526917A - Liquid crystal screen dot matrix detection device achieving scanning by means of line-scan digital camera - Google Patents
Liquid crystal screen dot matrix detection device achieving scanning by means of line-scan digital camera Download PDFInfo
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- CN106526917A CN106526917A CN201611118276.5A CN201611118276A CN106526917A CN 106526917 A CN106526917 A CN 106526917A CN 201611118276 A CN201611118276 A CN 201611118276A CN 106526917 A CN106526917 A CN 106526917A
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- liquid crystal
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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
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- Nonlinear Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a liquid crystal screen dot matrix detection device achieving scanning by means of a line-scan digital camera, and belongs to the technical field of liquid crystal screen defect detection. In a dark room environment free of ambient light, a liquid crystal screen is fixedly arranged on a liquid crystal backlight plate with the size same as that of the liquid crystal screen in a zero-distance mode to completely coincide with the backlight plate; a lens is installed on the line-scan digital camera, the camera is fixedly connected to a mobile mechanism through a bolt to form a line-scan imaging system, and the line-scan imaging system is located right ahead of one side of the liquid crystal screen; the liquid crystal backlight plate and the liquid crystal screen are lightened, the lens direction of the line-scan imaging system is made to be perpendicular to the plane where the liquid crystal screen is located by adjusting the mobile mechanism, and then the line-scan imaging system can collect all pixels, in the vertical direction, of the liquid crystal screen which directly faces the line-scan imaging system. According to the device, by means of the characteristic that the image collecting speed of the line-scan digital camera is high, the detection speed is greatly increased; compared with a general defect detection image processing algorithm, the efficiency is high, and the reliability is good.
Description
Technical field
The present invention is a kind of LCD screen dot matrix detection means of employing line-scan digital camera scanning, belongs to liquid crystal display screen defects detection skill
Art field.
Background technology
Liquid crystal display screen is typically in dust-free workshop Precision Machining and manufacture, but still inevitably occurs various
Defect, such as bad point, bright spot, dim spot, foreign body spot etc..The detection method of traditional liquid crystal display screen defect is manually to regard
Feel, this method detection liquid crystal display screen defect is affected by the subjective judgment of people, may cause flase drop, missing inspection, in addition detects speed
Degree is slower.
Using Machine Vision Detection liquid crystal display screen defect effect more preferably, more accurately, so adopting Machine Vision Detection liquid crystal
Screen defect will become main flow.When with Machine Vision Detection liquid crystal display screen defect, usually camera is faced in employing carries out image acquisition,
Exist following difficult：One is, as the overall dimensions that the pixel ratio of liquid crystal display screen is higher and shields are larger, to face camera and be difficult accurately
Collect each pixel in screen.Two are affected by the brightness of liquid crystal display screen in detection, need long when gathering information
Time of exposure, detection speed are slower.Three is the picture side returned due to the limitation of general camera in visual system itself, collection
The information of edge point is not accurate enough.Even if four is can to pass through general collected by camera to whole liquid crystal display screen picture, its defects detection
Algorithm is also very complicated.
The line-scan digital camera scanning liquid crystal display screen defect detecting device of this project invention is solved well used above faces phase
Machine produced problem in the detection.
The content of the invention
The present invention is a kind of LCD screen dot matrix quality detection device of employing line-scan digital camera scanning, inspection that can be rapidly and efficiently
Survey the various defects of liquid crystal display screen.
The concrete equipment of device of the present invention includes computer, LCD backlight plate, liquid crystal display screen, camera lens, line-scan digital camera, moving machine
Structure, external trigger module.
The specific embodiment of device of the present invention is：Under dark room conditions without ambient light, liquid crystal display screen zero distance is fixed
Be positioned over on the onesize LCD backlight plate of liquid crystal display screen so that liquid crystal display screen and backlight are completely superposed；Camera lens is arranged on linear array
On camera, camera is bolted the composition linear array imaging system in travel mechanism that is fixed on, linear array imaging system is in liquid
The dead ahead of the side of brilliant screen；LCD backlight plate and liquid crystal display screen are lighted, the camera lens that travel mechanism causes linear array imaging system is adjusted
Direction is vertical with liquid crystal display screen place plane so that linear array imaging system can collect which just to institute on the vertical direction at liquid crystal display screen
Some pixels；Computer and external trigger module are connected by data wire, and computer and linear array imaging system pass through netting twine and data
Line connects.
Linear array imaging system starts to adopt picture, controls imaging width of travel mechanism's distance mobile every time for line-scan digital camera,
External trigger module control camera adopts picture, and mechanism moves line-scan digital camera and just adopts once as until by all pixels of liquid crystal display screen
Gather.The image for collecting is input to computer and is processed by linear array imaging system.Wherein external trigger circuit can be produced
Pulse signal, the pulse width control camera exposure time, carries out adopting picture using the pulsewidth of periodic various changes, once can obtain
Much images under conditions of exposure, and then realize that Larger Dynamic scope is imaged by image synthesis.
The positive effect of the present invention is：
1, when detecting liquid crystal display screen defect with line-scan digital camera, the resolution of line-scan digital camera more than 2 times of liquid crystal display screen resolution with
On, each pixel of liquid crystal display screen can be accurately detected.
2, using the fast characteristic of linear array camera image picking rate, greatly improve the speed of detection.
3, after this vision inspection apparatus is imaged using linear array scanning mode, image has good inhibition in scanning direction,
After computer is to image overlay, standard picture template can be generated, be compared with actual often row image with the template, can be led to
Cross simple calculating and judge whether liquid crystal display screen is defective, than general defects detection image processing algorithm efficiency high, reliability
It is good.
4, the camera adopted in said apparatus is line-scan digital camera, as the high sensitivity of line-scan digital camera overcomes general camera
The phenomenon that collection is image blurring.
5, the liquid crystal display images detection algorithm of independent research, with strong points, efficiency high.Wherein image processing algorithm is basic
Thinking be Geometry rectification (RGB split, border is asked for, boundary straight line be fitted, angle point is asked for, affine transformation), pixel split (region
Segmentation), ask for Pixel Information and the information of standard liquid crystal display screen compares, reaches a conclusion.
Description of the drawings
Fig. 1 is the structure chart of the present invention.
Specific embodiment
As shown in figure 1, a kind of LCD screen dot matrix quality detection device of employing line-scan digital camera scanning, can be rapidly and efficiently
The various defects of detection liquid crystal display screen.
The concrete equipment of device of the present invention includes computer, LCD backlight plate, liquid crystal display screen, camera lens, line-scan digital camera, moving machine
Structure, external trigger module.
The specific embodiment of device of the present invention is：Under dark room conditions without ambient light, liquid crystal display screen zero distance is fixed
Be positioned over on the onesize LCD backlight plate of liquid crystal display screen so that liquid crystal display screen and backlight are completely superposed；Camera lens is arranged on linear array
On camera, camera is bolted the composition linear array imaging system in travel mechanism that is fixed on, linear array imaging system is in liquid
The dead ahead of the side of brilliant screen；LCD backlight plate and liquid crystal display screen are lighted, the camera lens that travel mechanism causes linear array imaging system is adjusted
Direction is vertical with liquid crystal display screen place plane so that linear array imaging system can collect which just to institute on the vertical direction at liquid crystal display screen
Some pixels；Computer and external trigger module are connected by data wire, and computer and linear array imaging system pass through netting twine and data
Line connects.
Linear array imaging system starts to adopt picture, controls imaging width of travel mechanism's distance mobile every time for line-scan digital camera,
External trigger module control camera adopts picture, and mechanism moves line-scan digital camera and just adopts once as until by all pixels of liquid crystal display screen
Gather.The image for collecting is input to computer and is processed by linear array imaging system.
Linear array imaging system in device is maintained static, by travel mechanism with liquid crystal display screen and LCD backlight plate relative to line
Battle array imaging system does translation.
External trigger circuit can produce pulse signal, pulse width control camera exposure time, using periodically various
The pulsewidth of change carries out adopting picture, can once obtain the image under many conditions of exposures, and then realize Larger Dynamic model by image synthesis
Surround picture.
More than 2 times more than liquid crystal display screen resolution of the resolution of line-scan digital camera, to collect each pixel of liquid crystal display screen
Information.
Linear array imaging system in device will collect image transmitting to computer, it is characterised in that pass through on computers
Image processing algorithm, draws the transmitance of liquid crystal display screen independent pixel, and the basic ideas of wherein image processing algorithm are Geometry rectifications
(RGB split, border is asked for, boundary straight line be fitted, angle point is asked for, affine transformation), pixel split (region segmentation), ask for pixel
The information of information and standard liquid crystal display screen compares, reaches a conclusion.
Can be monochromatic black and white camera, or coloured silk on the premise of guaranteeing to collect each pixel of liquid crystal display screen
Form and aspect machine.
Existing camera in imaging systems in said apparatus is line-scan digital camera or TDI cameras, TDI (Time Delay
Integration) camera increased imaging device dark equivalent to multirow line-scan digital camera for common line-scan digital camera
Luminous sensitivity and dynamic range under the environment of field.
Claims (7)
1. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera is scanned, it is characterised in that：The device includes computer, liquid
Brilliant backlight, liquid crystal display screen, camera lens, line-scan digital camera, travel mechanism, external trigger module；
Under dark room conditions without ambient light, by liquid crystal display screen zero distance fixed placement in the onesize LCD backlight plate of liquid crystal display screen
On so that liquid crystal display screen and backlight are completely superposed；Camera lens is arranged on line-scan digital camera, camera is bolted and is fixed on shifting
Linear array imaging system is constituted on motivation structure, linear array imaging system is in the dead ahead of the side of liquid crystal display screen；Light LCD backlight plate
And liquid crystal display screen, adjust travel mechanism and cause the lens direction of linear array imaging system vertical with liquid crystal display screen place plane so that linear array
Imaging system can collect which just to all of pixel on the vertical direction at liquid crystal display screen；Computer and external trigger module are by number
Connect according to line, computer and linear array imaging system pass through netting twine and data wire connection；
Linear array imaging system starts to adopt picture, controls imaging width of travel mechanism's distance mobile every time for line-scan digital camera, outer to touch
Send out module control camera and adopt picture, mechanism moves a line-scan digital camera and just adopts once as until all pixels by liquid crystal display screen are gathered
It is complete；The image for collecting is input to computer and is processed by linear array imaging system.
2. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera according to claim 1 is scanned, it is characterised in that：
Linear array imaging system in device is maintained static, by travel mechanism with liquid crystal display screen and LCD backlight plate relative to linear array imaging system
System does translation.
3. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera according to claim 1 is scanned, it is characterised in that：
External trigger circuit produces pulse signal, the pulse width control camera exposure time, is entered using the pulsewidth of periodic various changes
Row adopts picture, once obtains the image under many conditions of exposures, and then realizes that Larger Dynamic scope is imaged by image synthesis.
4. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera according to claim 1 is scanned, it is characterised in that：
More than 2 times more than liquid crystal display screen resolution of the resolution of line-scan digital camera, to collect the information of each pixel of liquid crystal display screen.
5. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera according to claim 1 is scanned, it is characterised in that：
Linear array imaging system in device will collect image transmitting to computer, it is characterised in that on computers by image procossing
Algorithm, draws the transmitance of liquid crystal display screen independent pixel, and the basic ideas of wherein image processing algorithm are Geometry rectification, pixel point
Cut, ask for Pixel Information and the information of standard liquid crystal display screen compares, reaches a conclusion.
6. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera according to claim 1 is scanned, it is characterised in that：
It is monochromatic black and white camera or color camera on the premise of guaranteeing to collect each pixel of liquid crystal display screen.
7. the LCD screen dot matrix detection means that a kind of employing line-scan digital camera according to claim 1 is scanned, it is characterised in that：
Camera in imaging system is line-scan digital camera or TDI cameras.
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| CN201611118276.5A CN106526917A (en) | 2016-12-07 | 2016-12-07 | Liquid crystal screen dot matrix detection device achieving scanning by means of line-scan digital camera |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107261257A (en) * | 2017-05-25 | 2017-10-20 | 上海禹康医疗器械有限公司 | Air detection method and device in a kind of woven hose based on machine vision |
| CN109031726A (en) * | 2018-08-31 | 2018-12-18 | 贵州华旭光电技术有限公司 | Detection device for liquid crystal display |
| CN110596139A (en) * | 2019-08-26 | 2019-12-20 | 武汉精立电子技术有限公司 | Screen defect detection method and system |
| CN111221157A (en) * | 2020-01-16 | 2020-06-02 | 深圳谦华益科技有限公司 | LCD display detection system with optical scanning |
| CN113946066A (en) * | 2021-09-22 | 2022-01-18 | 河北汉光重工有限责任公司 | Liquid crystal display detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107261257A (en) * | 2017-05-25 | 2017-10-20 | 上海禹康医疗器械有限公司 | Air detection method and device in a kind of woven hose based on machine vision |
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| CN113946066B (en) * | 2021-09-22 | 2024-05-10 | 河北汉光重工有限责任公司 | Liquid crystal display detection system |
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Application publication date: 20170322 |