CN109856155A - A kind of liquid crystal display surface detection apparatus and method based on polarised light - Google Patents
A kind of liquid crystal display surface detection apparatus and method based on polarised light Download PDFInfo
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- CN109856155A CN109856155A CN201910049640.4A CN201910049640A CN109856155A CN 109856155 A CN109856155 A CN 109856155A CN 201910049640 A CN201910049640 A CN 201910049640A CN 109856155 A CN109856155 A CN 109856155A
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Abstract
This application involves a kind of liquid crystal display surface detection apparatus and method based on polarised light, device includes carrying out mobile shifting carrying platform for carrying liquid crystal display；It is set to above shifting carrying platform, the high speed linear array camera of the product image for detecting acquisition liquid crystal display；It is connect with high speed linear array camera, the industrial computer for being handled product image；It is set to above shifting carrying platform, the LED bar graph light source for being illuminated to liquid crystal display；It is set to the front of the light-emitting surface of LED bar graph light source, the polaroid of polarization manipulation is carried out for the irradiation light to LED bar graph light source；The side towards LED bar graph light source of second polaroid is pasted with optical clear glass.The background bright fringes for eliminating the image of acquisition, the defect for having highlighted defect similar with bright fringes originally and having been covered by bright fringes are more clear surface defect imaging, improve the efficiency and precision of Surface testing.
Description
Technical field
The present invention relates to technical field of optical detection more particularly to a kind of liquid crystal display Surface testings based on polarised light
Device and method.
Background technique
At present in liquid crystal display Surface testing, more commonly used is the LED bar graph light source using high brightness to liquid crystal
Display screen carries out polishing, and the line-scan digital camera of high speed carries out adopting figure, is then analyzed and processed by algorithm to obtained image, into
And detect the defect of liquid crystal display screen surfaces.Due to the special structure composition of liquid crystal display, deposited in acquired image background
In the very high bright fringes of elongated and density, these bright fringes, which are often obscured, even masks lacking for liquid crystal display screen surfaces
It falls into, influences the efficiency and precision of Surface testing.
Summary of the invention
In order to solve the above-mentioned technical problem the present invention provides a kind of liquid crystal display surface detection apparatus based on polarised light.
The technical scheme to solve the above technical problems is that a kind of liquid crystal display screen surfaces inspection based on polarised light
Survey device, comprising:
Shifting carrying platform is moved for carrying liquid crystal display.
High speed linear array camera is set to above the shifting carrying platform, for detecting the product for acquiring the liquid crystal display
Image.
Industrial computer is connect with the high speed linear array camera, for handling the product image.
LED bar graph light source is set to above the shifting carrying platform, for illuminating to the liquid crystal display.
Polaroid is set to the front of the light-emitting surface of the LED bar graph light source, for the LED bar graph light source
Irradiation light carries out polarization manipulation.
Optical clear glass is attached to the side towards the LED bar graph light source of second polaroid.
The invention has the advantages that according to the composed structure principle of liquid crystal display, in high-brightness LED strip source
Light-emitting surface adds polaroid and optical clear glass, polishing is carried out to liquid crystal display using the polarised light that light source issues, from light
The angle of picture is studied, the background bright fringes of the image of acquisition is largely eliminated, has been highlighted originally similar with bright fringes
Defect and the defect covered by bright fringes are more clear surface defect imaging, improve the efficiency and precision of Surface testing.
Based on the above technical solution, the present invention can also be improved as follows.
It further, further include capture card for acquiring the data of the product image, the acquisition is assigned in the work
On industry computer and with the industrial computer.
Beneficial effect using above-mentioned further scheme is, by capture card, picture signal effectively can be collected industry
In computer, it is stored on hard disk in the form of data file.
It further, further include the camerlink line for the data for being used for transmission the product image, the high speed linear array camera
It is connect by the camerlink line with the capture card.
Beneficial effect using above-mentioned further scheme is to be conducive to the transmission of image data by camerlink line.
It further, further include display for showing the product image, the display and the industrial computer
Connection.
Beneficial effect using above-mentioned further scheme is the product image and phase that display can be facilitated to acquire by display
The software interface of pass.
Further, height of the lower edge of the LED bar graph light source apart from the liquid crystal display is 80-100mm.
Further, the irradiation light of LED bar graph light source described in the lens direction face of the high speed linear array camera is described
The reflection direction of liquid crystal display, and the irradiation light of the LED bar graph light source and the detection plane of the liquid crystal display
The angle of vertical direction is β, the detection plane of the lens direction and liquid crystal display of the high speed linear array camera it is vertical
The angle in direction is α；And the α is equal to the β.
Further, the α and β is 10 °.
In order to solve the above-mentioned technical problem the present invention also provides a kind of liquid crystal display Surface testing side based on polarised light
Method.
Its technical solution is as follows: a kind of liquid crystal display surface inspecting method based on polarised light, using it is above-mentioned based on
The liquid crystal display surface detection apparatus of polarised light carries out the liquid crystal display Surface testing based on polarised light, and method includes:
Step 1, the liquid crystal display is placed on the shifting carrying platform, and according to the detection of the liquid crystal display
The polarization direction of the polaroid on surface adjusts the angle of the irradiation light of the LED bar graph light source；
Step 2, by the irradiation light of LED bar graph light source described in the angle lens face of the high speed linear array camera described
The reflection direction of liquid crystal display, and by the detection plane of the irradiation light of the LED bar graph light source and the liquid crystal display
The angle of vertical direction be set as β, the lens direction of the high speed linear array camera and the detection plane of the liquid crystal display
The angle of vertical direction be set as α；Wherein, the α is equal to the β；
Step 3, the imaging parameters adjustment of the high speed linear array camera is adjusted, and it is flat at the uniform velocity to move the transfer
Platform, the high speed linear array camera by adjusting after acquire the product image of the liquid crystal display.
The beneficial effect is that adjusting institute by the polarization direction of the polaroid for detecting surface according to the liquid crystal display
The angle for stating the irradiation light of LED bar graph light source just can only be by polarisation when illumination is mapped to the polaroid of liquid crystal display screen surfaces
Piece absorbs and reflection, and without having transmissive portion, also there will be no the presentations of inner vein, can more effectively acquire product figure
Picture.
Further, the specific implementation of the step 1 are as follows:
By the polaroid of the polarization direction of the polaroid of the LED bar graph light source and the detection surface of the liquid crystal display
Polarization direction be set as being mutually perpendicular to.
Further, the specific implementation of the step 3 are as follows:
The time for exposure of the high speed linear array camera is set as 20 μ s-40 μ s, gain is set as 3-4dB；And described in
The gray average of product image is adjusted to 130.
Detailed description of the invention
Fig. 1 is that a kind of structure of the liquid crystal display surface detection apparatus based on polarised light provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is the structural schematic diagram of liquid crystal display provided in an embodiment of the present invention；
Fig. 3 is the image eliminated before liquid crystal display background striped that the present invention applies that example provides；
Fig. 4 is the image eliminated after liquid crystal display background striped that the present invention applies that example provides.
In attached drawing, parts list represented by the reference numerals are as follows:
1, liquid crystal display, 2, shifting carrying platform, 3, LED bar graph light source, 4, high speed linear array camera, 5, industrial computer.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As shown in Figure 1, a kind of liquid crystal display surface detection apparatus based on polarised light provided in an embodiment of the present invention, packet
It includes: carrying out mobile shifting carrying platform 2 for carrying liquid crystal display 1；It is set to 2 top of shifting carrying platform, is adopted for detecting
Collect the high speed linear array camera 4 of the product image of the liquid crystal display 1；It is connect with the high speed linear array camera 4, for described
The industrial computer 5 that product image is handled；Be set to 2 top of the shifting carrying platform, for the liquid crystal display 1 into
The LED bar graph light source 3 of row illumination；It is set to the front of the light-emitting surface of the LED bar graph light source 3, for the LED bar graph
The irradiation light of light source 3 carries out the polaroid of polarization manipulation；Second polaroid towards the one of the LED bar graph light source 3
Side is pasted with optical clear glass.Wherein, LED bar graph light source 3 selects the LED bar graph light source 3 of high brightness.
It optionally, further include capture card for acquiring the data of the product image, the acquisition is assigned in the work
On industry computer 5 and with the industrial computer 5.By capture card, picture signal effectively can be collected into industrial computer 5
In, it is stored on hard disk in the form of data file.
It optionally, further include the camerlink line for the data for being used for transmission the product image, the high speed linear array camera
4 are connect by the camerlink line with the capture card.Be conducive to the transmission of image data by camerlink line.
It optionally, further include display for showing the product image, the display and the industrial computer 5
Connection.The product image that display can be facilitated to acquire by display and relevant software interface.
Optionally, height of the lower edge of the LED bar graph light source 3 apart from the liquid crystal display 1 is 80-100mm.
Optionally, the irradiation light of LED bar graph light source 3 described in the lens direction face of the high speed linear array camera is described
The reflection direction of liquid crystal display 1, and the detection plane of the irradiation light of the LED bar graph light source 3 and the liquid crystal display 1
The angle of vertical direction be β, the detection plane of the lens direction of the high speed linear array camera and the liquid crystal display 1 it is vertical
Histogram to angle be α；And the α is equal to the β.
Optionally, the α and β is 10 °.
In practical application scene, first the physical structure composition of liquid crystal display 1 is analyzed, as shown in Fig. 2, up and down
Two layers of polaroid, polarization direction are orthogonal, it is however generally that, polarization direction parallel or perpendicular to liquid crystal display 1 length direction,
Centre is liquid-crystalline glasses, and the Surface testing of liquid crystal display 1 is actually the defect detected on polaroid, such as dirty point, scratch, gas
Bubble, bumps etc., but due to polaroid be to LED light source it is semi-transparent, liquid crystal cells are also regularly arranged on liquid-crystalline glasses
, they will lead in imaging background there are the very high bright fringes of elongated and density, these bright fringes will affect defect imaging
The detection efficiency of precision and algorithm.
Therefore, in the present embodiment, when being detected to liquid crystal display 1, specifically, high speed linear array camera 4 and vertical
Angular separation is set as 10 °, and the LED bar graph light source 3 of high brightness and the angle of vertical direction are set as -10 °, i.e. camera and bar shaped
Light source is in specular reflectance model with respect to liquid crystal screen surfaces.
Then, it cuts respectively and obtains the polaroid and a piece of same size optical clear glass of a strip, by polarisation
Piece is attached on optical clear glass, and optical clear glass is fixed on immediately ahead of the light-emitting surface of LED bar graph light source 3, it is desirable that
Optical clear glass just covers light-emitting surface, has obtained the lighting source with particular polarization in this way, has required light here
Polarization direction be strictly perpendicular to the polarization direction of liquid crystal display upper surface polaroid to be mapped to the inclined of liquid crystal screen surfaces when illumination
When mating plate, just it can only be absorbed and be reflected by polaroid, without having transmissive portion, also there will be no the presentations of inner vein.
Finally, liquid crystal display is placed on shifting carrying platform 2, the strip source of high brightness is opened, adjusts high speed linear array camera 4
Imaging parameters, at the uniform velocity move shifting carrying platform 2, acquire the surface image of liquid crystal display 1.
Specifically, the time for exposure of whole camera can be set as 20 μ s-40 μ s by imaging parameters setting, and gain is set as 3-
The image grayscale mean value of acquisition is adjusted to 130 by flat field correction function by 4dB.
Finally, the product image that detection device through this embodiment detects is as shown in figure 3, successfully eliminate product figure
The background bright fringes of picture has highlighted originally and bright fringes compared to the product image for not eliminating background bright fringes as shown in Figure 4
Similar defect and the defect covered by bright fringes, can allow algorithm more easily to detect surface defect.
In conclusion a kind of liquid crystal display surface detection apparatus based on polarised light of the present embodiment, according to liquid crystal
The composed structure principle of display screen 1 adds polaroid and optical clear glass in the light-emitting surface of high-brightness LED strip source 3, utilizes
The polarised light that light source issues carries out polishing to liquid crystal display 1 and largely eliminates acquisition from the angle of optical imagery
The background bright fringes of image, the defect for having highlighted defect similar with bright fringes originally and having been covered by bright fringes, makes surface defect
Imaging is more clear, and improves the efficiency and precision of Surface testing.
The present embodiment provides a kind of liquid crystal display surface inspecting method based on polarised light, using above-mentioned based on polarization
The liquid crystal display surface detection apparatus of light, method include:
Step 1, the liquid crystal display 1 is placed on the shifting carrying platform 2, and according to the liquid crystal display 1
The polarization direction of the polaroid on detection surface adjusts the angle of the irradiation light of the LED bar graph light source 3；
Step 2, by the irradiation light of LED bar graph light source 3 described in the angle lens face of the high speed linear array camera 4 in institute
State the reflection direction of liquid crystal display 1, and by the detection of the irradiation light of the LED bar graph light source 3 and the liquid crystal display 1
The angle of the vertical direction of plane is set as β, the detection of the lens direction of the high speed linear array camera and the liquid crystal display 1
The angle of the vertical direction of plane is set as α；Wherein, the α is equal to the β；
Step 3, the imaging parameters adjustment of the high speed linear array camera 4 is adjusted, and it is flat at the uniform velocity to move the transfer
Platform 2, the high speed linear array camera 4 by adjusting after acquire the product image of the liquid crystal display 1.
The beneficial effect is that being adjusted by the polarization direction of the polaroid for detecting surface according to the liquid crystal display 1
The angle of the irradiation light of the LED bar graph light source 3 just can only be by when illumination is mapped to the polaroid on 1 surface of liquid crystal display
Polaroid absorbs and reflection, and without having transmissive portion, also there will be no the presentations of inner vein, can more effectively acquire production
Product image.
Optionally, the specific implementation of the step 1 are as follows:
By the polarisation of the polarization direction of the polaroid of the LED bar graph light source 3 and the detection surface of the liquid crystal display 1
The polarization direction of piece is set as being mutually perpendicular to.
Optionally, the specific implementation of the step 3 are as follows:
The time for exposure of the high speed linear array camera 4 is set as 20 μ s-40 μ s, gain is set as 3-4dB；And described in
The gray average of product image is adjusted to 130.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of liquid crystal display surface detection apparatus based on polarised light characterized by comprising
Shifting carrying platform (2) is moved for carrying liquid crystal display (1)；
High speed linear array camera (4) is set to above the shifting carrying platform (2), for detecting the acquisition liquid crystal display (1)
Product image；
Industrial computer (5) is connect, for handling the product image with the high speed linear array camera (4)；
LED bar graph light source (3) is set to above the shifting carrying platform (2), for illuminating to the liquid crystal display (1)；
Polaroid is set to the front of the light-emitting surface of the LED bar graph light source (3), for the LED bar graph light source (3)
Irradiation light carry out polarization manipulation；
Optical clear glass is attached to the side towards the LED bar graph light source (3) of second polaroid.
2. a kind of liquid crystal display surface detection apparatus based on polarised light according to claim 1, which is characterized in that also wrap
The capture card of the data for acquiring the product image is included, the acquisition is assigned in the industrial computer (5).
3. a kind of liquid crystal display surface detection apparatus based on polarised light according to claim 2, which is characterized in that also wrap
The camerlink line for the data for being used for transmission the product image is included, the high speed linear array camera (4) passes through described
Camerlink line is connect with the capture card.
4. a kind of liquid crystal display surface detection apparatus based on polarised light according to claim 1, which is characterized in that also wrap
The display for showing the product image is included, the display is connect with the industrial computer (5).
5. a kind of liquid crystal display surface detection apparatus based on polarised light according to claim 1, which is characterized in that described
Height of the lower edge of LED bar graph light source (3) apart from the liquid crystal display (1) is 80-100mm.
6. according to claim 1 to a kind of any one of 5 liquid crystal display surface detection apparatus based on polarised light, feature
It is, the irradiation light of LED bar graph light source (3) described in the lens direction face of the high speed linear array camera (4) is in the liquid crystal
The reflection direction of display screen (1), and the detection of the irradiation light of the LED bar graph light source (3) and the liquid crystal display (1) is flat
The angle of the vertical direction in face is β, the lens direction of the high speed linear array camera (4) and the detection of the liquid crystal display (1)
The angle of the vertical direction of plane is α；And the α is equal to the β.
7. a kind of liquid crystal display surface detection apparatus based on polarised light according to claim 6, which is characterized in that described
The α and β is 10 °.
8. a kind of liquid crystal display surface inspecting method based on polarised light, which is characterized in that using any one of claim 1-7
The liquid crystal display surface detection apparatus based on polarised light carries out the liquid crystal display Surface testing based on polarised light,
Method includes:
Step 1, the liquid crystal display (1) is placed on the shifting carrying platform (2), and according to the liquid crystal display (1)
Detection surface polaroid polarization direction adjust the LED bar graph light source (3) irradiation light angle；
Step 2, by the irradiation light of LED bar graph light source (3) described in the angle lens face of the high speed linear array camera (4) in institute
State the reflection direction of liquid crystal display (1), and by the irradiation light of the LED bar graph light source (3) and the liquid crystal display (1)
The angle of vertical direction of detection plane be set as β, the lens direction and the liquid crystal display of the high speed linear array camera
(1) angle of the vertical direction of detection plane is set as α；Wherein, the α is equal to the β；
Step 3, the imaging parameters adjustment of the high speed linear array camera (4) is adjusted, and at the uniform velocity moves the shifting carrying platform
(2), the high speed linear array camera (4) by adjusting after acquires the product image of the liquid crystal display (1).
9. a kind of liquid crystal display surface inspecting method based on polarised light according to claim 8, which is characterized in that described
The specific implementation of step 1 are as follows:
By the polarisation of the polarization direction of the polaroid of the LED bar graph light source (3) and the detection surface of the liquid crystal display (1)
The polarization direction of piece is set as being mutually perpendicular to.
10. a kind of liquid crystal display surface inspecting method based on polarised light according to claim 8, which is characterized in that institute
State the specific implementation of step 3 are as follows:
The time for exposure of the high speed linear array camera (4) is set as 20 μ s-40 μ s, gain is set as 3-4dB；And the production
The gray average of product image is adjusted to 130.
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Cited By (5)
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| CN110208285A (en) * | 2019-06-14 | 2019-09-06 | 苏州精濑光电有限公司 | A kind of detection device |
| CN111024729A (en) * | 2019-12-27 | 2020-04-17 | 无锡动视宫原科技有限公司 | Method and system for detecting slight indentation on surface of polaroid |
| CN111273466A (en) * | 2020-01-20 | 2020-06-12 | 凌云光技术集团有限责任公司 | Display screen surface defect detecting system |
| CN114184551A (en) * | 2021-12-14 | 2022-03-15 | 乐金显示光电科技(中国)有限公司 | Quality inspection system for glass substrate metal film |
| CN117589423A (en) * | 2023-09-26 | 2024-02-23 | 成都瑞波科材料科技有限公司 | Display device detection system and display device detection method |
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| CN117589423A (en) * | 2023-09-26 | 2024-02-23 | 成都瑞波科材料科技有限公司 | Display device detection system and display device detection method |
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