KR20160114463A - Backlight Unit Inspection Equipment - Google Patents

Backlight Unit Inspection Equipment Download PDF

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Publication number
KR20160114463A
KR20160114463A KR1020150041001A KR20150041001A KR20160114463A KR 20160114463 A KR20160114463 A KR 20160114463A KR 1020150041001 A KR1020150041001 A KR 1020150041001A KR 20150041001 A KR20150041001 A KR 20150041001A KR 20160114463 A KR20160114463 A KR 20160114463A
Authority
KR
South Korea
Prior art keywords
backlight unit
pressing
camera
pusher
lighting jig
Prior art date
Application number
KR1020150041001A
Other languages
Korean (ko)
Inventor
손영곤
Original Assignee
(주)소닉스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)소닉스 filed Critical (주)소닉스
Priority to KR1020150041001A priority Critical patent/KR20160114463A/en
Publication of KR20160114463A publication Critical patent/KR20160114463A/en

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    • 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
    • G01N21/8803—Visual inspection
    • 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
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • 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
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • 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
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
    • G01N2021/889—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques providing a bare video image, i.e. without visual measurement aids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/10—Scanning
    • G01N2201/102—Video camera

Abstract

The present invention relates to a backlight unit testing device for testing a defect of a backlight unit. According to the present invention, the backlight unit testing device includes: a position moving device which moves a backlight unit between a loading position and a testing position; a pressing unit which presses the top surface of the backlight moved to the testing position by the position moving unit to remove air between films layered in the backlight unit; a camera which takes images of the backlight unit of which the top surface is pressed by the pressing unit; and a control device which controls the operation of the position moving device, pressing unit, and camera, tests the images taken by the camera, and determines if the backlight has any defect. According to the present invention, the present invention can remove air existing between the films layered in the backlight unit and test if the backlight unit has any defect accurately, thereby improving test reliability.

Description

Backlight Unit Inspection Equipment [0001]

The present invention relates to a backlight unit inspection apparatus.

In recent years, liquid crystal displays (LCDs) have been widely adopted in mobile phones, tablet PCs, monitors, and television receivers for high-performance and high-quality implementations and thin plate types.

The liquid crystal display device is a combination of a liquid crystal and a backlight unit.

The backlight unit provides light, and the light provided by the backlight unit forms a screen while refracting in different patterns in the liquid crystal.

Because the backlight unit provides light, foreign matter or various defects present in the laminated films of the backlight unit act as an obstacle to the provision of appropriate light. Therefore, the process of inspecting the failure of stacked films is an essential and important process.

Conventionally, the inspection of the defectiveness of the backlight unit has been made by the naked eye. However, tests based only on the naked eye have limitations and are less accurate.

Therefore, in recent years, a backlight unit inspection apparatus using a camera is used.

The backlight unit inspection apparatus acquires an image by capturing an image of the upper surface of the backlight unit by a camera, and displays the obtained image, thereby helping an operator to easily check whether the backlight unit is defective.

On the other hand, a backlight unit is generally formed by sequentially laminating various films such as a first diffusion film, a first prism film, a second prism film, a second diffusion film, a light shielding film, and a protective film on a mold frame.

However, there is often air between the laminated films. In this case, the image obtained by the camera due to the presence of air is poor and the accuracy of the inspection is poor.

Korean Patent Publication No. 10-2005-0026493

It is an object of the present invention to provide a technique for inspecting a backlight unit in a state in which air between stacked films is removed in the inspection of the backlight unit.

The apparatus for inspecting a backlight unit according to the present invention includes: a position shifter for moving a backlight unit between a loading position and an inspection position; A pusher for pressing the upper surface of the backlight unit moved to the inspection position by the position moving device to remove air between the stacked films of the backlight unit; A camera for photographing a backlight unit whose upper surface is pressed by the pusher; And a controller for controlling operations of the position moving device, the pusher, and the camera; .

The position-shifter includes: a lighting jig receiving the backlight unit and applying power to the LED elements of the backlight unit; A moving source for applying a moving force to the lighting jig; And a guide member for guiding movement of the lighting jig; .

The controller controls the positioner, the pusher, and the controller so as to photograph the upper surface of the backlight unit by the camera while pressing the upper surface of the backlight unit by the pusher at every stop of the lighting jig while stepping the light- And controls the camera.

Wherein the pusher comprises: a pressing member for pressing an upper surface of the backlight unit on the lighting jig; And an elevator for pressing and releasing the upper surface of the backlight unit located below the pressing member by raising and lowering the pressing member; .

The pressing member has at least one exposure hole for allowing at least a part of the upper surface of the backlight unit to be exposed to the camera.

The plurality of exposure holes are provided, and the pressing members have pressing fingers that can press the backlight unit between the exposure holes.

It is preferable that the pressing member has a pressing pad of a flexible material provided on the bottom surface of the pressing fingers.

It is preferable that the width of the exposure hole is wider than the width of the pressing flesh.

According to the present invention, since the air existing between the laminated films is removed and the backlight unit is inspected, accurate inspection can be performed to improve the reliability of the inspection.

1 is a schematic perspective view of a backlight unit inspection apparatus according to an embodiment of the present invention.
2 is an excerpt of a pusher applied to the backlight unit inspection apparatus of FIG.
Figure 3 is an enlarged plan view of the pushing member applied to the pusher of Figure 2;
Figs. 4 to 8 are operational state diagrams for explaining operations of main parts of the backlight unit testing apparatus of Fig. 1. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which technical sections already known will be omitted or compressed for simplicity of explanation.

1 is a schematic perspective view of a backlight unit testing apparatus 100 according to an embodiment of the present invention.

The backlight unit testing apparatus 100 according to the present embodiment includes a position shifter 110, a pusher 120, a camera 130, a displayer 140, and a controller 150. [

The position shifter 110 moves the backlight unit between the loading position LP and the inspection position TP. The position shifter 110 includes a lighting jig 111, a moving source 112, and a guiding member 113. Here, the loading position LP is a position at which the backlight unit is mounted on the lighting jig 111, and the inspection position TP is a position at which the camera 130 photographs the upper surface of the backlight unit.

The lighting jig 111 receives the loaded backlight unit and applies power to the LED elements of the backlight unit.

The moving source 112 moves the backlight unit placed on the lighting jig 111 between the loading position LP and the inspection position TP by moving the lighting jig 111 between the loading position LP and the inspection position TP .

The guide member 113 is provided as a pair of guide rails 113a and 113b and guides the movement of the lighting jig 111. [

The pusher 120 presses the upper surface of the backlight unit moved to the inspection position TP by the position shifter 110 to remove the air between the laminated films of the backlight unit. This pusher 120 includes a pushing member 121 and an elevator 122 as in the excerpt of FIG.

The pressing member 121 presses the upper surface of the backlight unit placed on the lighting jig 111 in the inspection position TP. This pushing member 121 has the exposure holes EH that allow some of the upper surface of the backlight unit to be exposed when the upper surface of the backlight unit is pressed as shown in the enlarged plan view of FIG. Therefore, between the exposure holes EH, pressing pieces 121a capable of pressing the upper surface of the backlight unit are provided.

When the upper surface of the backlight unit is pressed by the pushing pieces 121a, the pressing member 121 is pressed by the pressing piece 121a to prevent the upper surface of the backlight unit from being damaged by the pressure applied to the upper surface of the backlight unit. And a pressing pad 121b made of a flexible material.

The elevator 122 is constituted by a pair of cylinders 122a and 122b.

The pair of cylinders 122a and 122b elevate the pushing member 121 by applying a force to both ends of the pushing member 121, respectively.

The camera 130 captures the image of the upper surface of the backlight unit at the inspection position TP to acquire an image.

The display unit 140 is provided for displaying an image photographed by the camera 130. [

The controller 150 controls the position shifter 110, the pusher 120, the camera 130, and the displayer 140. More specifically, the controller 150 moves and stops the lighting jig 111 step by step, while pressing the upper surface of the backlight unit 120 with the pusher 120 each time the lighting jig 111 stops, The pusher 120, and the camera 130 so as to photograph the positioner 110, the pusher 120, and the camera 130, respectively.

The operation of the main part of the backlight unit inspection apparatus 100 configured as described above will be described below.

Fig. 4 shows a state in which the current lighting jig 111 is moved to the loading position LP. 4, the backlight unit is mounted on the lighting jig 111 by the operator or the automated supplying device.

When the backlight unit is placed on the lighting jig, the moving source 112 is operated by an automatic or manual operation command to move the lighting jig 111 to the inspection position TP. In the present embodiment, the inspection position TP is divided into a first inspection position TP 1 and a second inspection position TP 2 . The first inspection position TP 1 and the second inspection position TP 2 or the loading position LP indicated by arrows on the drawing are positions based on the center C of the lighting jig 111.

In the state of FIG. 4

As shown in FIG. 5, the controller 150 first controls the position shifter 110 to stop after the lighting jig 111 is moved to the first inspection position TP 1 .

5, the controller 150 controls the pusher 120 so that the pushing member 121 is lowered to press the upper surface of the backlight unit BLU mounted on the lighting jig 111, as shown in FIG. When the pressing member 121 is lowered, the upper surface of the backlight unit BLU is pressed by the pushing pieces 121a, so that the air existing between the laminated films is sideways (in the drawing, The air between the laminated films is removed. Therefore, it is preferable that the length L of the pressing pieces 121a (see FIG. 3) is longer than the width of the backlight unit BLU. Of course, the first image obtained at this time is an image for the portions exposed by the exposure holes EH in the state of FIG.

In the state of FIG. 6, the controller 150 operates the camera 130 to photograph the upper surface of the backlight unit BLU to acquire the first image.

When the first image is obtained, the pressing member 121 rises as shown in Fig.

In the state of FIG. 7, the controller 150 controls the position shifter 110 to move the lighting jig 111 to the second inspection position TP 2 as shown in FIG. 8, the upper surface of the backlight unit BLU is pressed by the pusher 120, and the upper surface of the backlight unit BLU is photographed by the camera 130 to obtain the second image. Then is moved to a back light unit (BLU) pressing device 120 is released and the pressure, where the mobile device 110 is a lighting fixture to a second inspection location (111) (TP 2) loading position (LP) in the for. Accordingly, the worker or the automated loading / unloading apparatus returns to the loading position LP to unload the backlight unit BLU from the lighting jig 111.

On the other hand, the controller 150 includes a first testing position (TP 1) of the first image and the second inspection position (TP 1), the second image combining one single image displayer 140 of the acquisition of the acquisition in Lt; / RTI > In this case, since the image of the entire upper surface of the backlight unit (BLU) must be combined by the combination of the first image and the second image, considering the shooting angle of the camera 130, etc., It is preferable that the width W 1 of the pressing piece EX is wider than the width W 2 of the pressing piece 121a. The distance between the first inspection position TP 1 and the second inspection position TP 2 which is the movement distance of the lighting jig 111 is larger than the width W 1 of the pressing piece 121a and the distance between the first inspection position TP 1 and the second inspection position TP 2 , Is preferably narrower than the width (W 2 ).

Then, when the image is displayed by the display unit 140, the operator confirms whether the backlight unit (BLU) is defective through the image of the upper surface of the displayed backlight unit (BLU).

Of course, according to the embodiment of the present invention, the acquired first image may be displayed first to check whether a part of the backlight unit (BLU) is defective, and then the second image obtained later may be displayed later to display the backlight unit (BLU) It is also conceivable to check whether or not the remaining portions of the defect are defective.

In the above-described embodiment, while the lighting jig 111 is moved and stopped in two stages and the images are obtained by the camera at the stop of the lighting jig 111 with respect to the upper surface of the backlight unit BLU, May be implemented to acquire images of the upper surface of the backlight unit (BLU) by the camera at every stop of the lighting jig while moving and stopping the lighting jig through three or more steps.

In addition, the number of the pressing fingers, the number of the exposure holes, the stepwise movement and stopping number of the lighting jig, and the number of times the camera is photographed may be added or subtracted according to the execution.

Therefore, while the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It is to be understood that the invention is not limited to the above-described embodiments, and the scope of the present invention should be understood as the following claims and their equivalents.

100: backlight unit inspection device
110:
120: pusher
121: pressing member
121a: Pressing 121b: Pressing pad
EH: Exposed hole
122: elevator
130: camera
150:

Claims (8)

A position shifter for moving the backlight unit between the loading position and the inspection position;
A pusher for pressing the upper surface of the backlight unit moved to the inspection position by the position moving device to remove air between the stacked films of the backlight unit;
A camera for photographing a backlight unit whose upper surface is pressed by the pusher; And
A controller for controlling operations of the position moving device, the pusher, and the camera; ≪ RTI ID = 0.0 >
Backlight unit inspection device. The method according to claim 1,
The position-
A lighting jig receiving the backlight unit and applying power to the LED elements of the backlight unit;
A moving source for applying a moving force to the lighting jig; And
A guide member for guiding movement of the lighting jig; ≪ RTI ID = 0.0 >
Backlight unit inspection device. 3. The method of claim 2,
The controller controls the positioner, the pusher, and the controller so as to photograph the upper surface of the backlight unit by the camera while pressing the upper surface of the backlight unit by the pusher at every stop of the lighting jig while stepping the light- And controls the camera
Backlight unit inspection device. 3. The method of claim 2,
The pusher
A pressing member for pressing the upper surface of the backlight unit on the lighting jig; And
An elevator for pressing and releasing the upper surface of the backlight unit located below the pressing member by raising and lowering the pressing member; And a backlight unit inspection apparatus. 5. The method of claim 4,
Wherein the pressing member has at least one exposure hole for allowing at least a part of the upper surface of the backlight unit to be exposed to the camera
Backlight unit inspection device. 6. The method of claim 5,
The number of the exposure holes is plural,
Characterized in that the pressing member has pressing fingers that can press the backlight unit between the exposure holes
Backlight unit inspection device. The method according to claim 6,
Wherein the pressing member has a pressing pad of a flexible material provided on a bottom surface of the pressing fingers
Backlight unit inspection device. The method according to claim 6,
Characterized in that the width of the exposure hole is larger than the width of the pressing piece
Backlight unit inspection device.
KR1020150041001A 2015-03-24 2015-03-24 Backlight Unit Inspection Equipment KR20160114463A (en)

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KR1020150041001A KR20160114463A (en) 2015-03-24 2015-03-24 Backlight Unit Inspection Equipment

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Application Number Priority Date Filing Date Title
KR1020150041001A KR20160114463A (en) 2015-03-24 2015-03-24 Backlight Unit Inspection Equipment

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113655125A (en) * 2021-09-07 2021-11-16 齐齐哈尔医学院 Image enhancement equipment based on animal tissue section development

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050026493A (en) 2002-07-22 2005-03-15 쇼와 덴코 가부시키가이샤 Continuous cast aluminum alloy rod and production method and apparatus thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050026493A (en) 2002-07-22 2005-03-15 쇼와 덴코 가부시키가이샤 Continuous cast aluminum alloy rod and production method and apparatus thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113655125A (en) * 2021-09-07 2021-11-16 齐齐哈尔医学院 Image enhancement equipment based on animal tissue section development

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