KR20170099198A - Inspection equipment for back light unit - Google Patents

Abstract

The present invention relates to a backlight unit inspection apparatus, and more particularly, to a moving jig on which a backlight unit is seated; A position moving device for moving the moving jig to be positioned at an arbitrary inspection position; A pressing device for pressing the backlight unit by supplying a pneumatic pressure into the closed inner space, forming a space in a closed state in which the backlight unit is positioned inside the upper surface of the moving jig moved to the first inspection position through the position moving device, ; An inspection camera for photographing the backlight unit pressed by the pressure device; And a control device for controlling each operation of the position moving device, the pressure device, and the inspection camera.
Accordingly, it is an object of the present invention to provide an apparatus and a method for confirming or more accurately detecting defective elements that have not been detected in a vision inspection process of a backlight unit placed at atmospheric pressure, and at the same time, The cause of the occurrence can be fundamentally solved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a backlight unit inspection apparatus,

The present invention relates to an inspection apparatus for a backlight unit.

BACKGROUND ART [0002] A variety of electronic devices including a liquid crystal display device capable of displaying a screen, such as a cellular phone, a display panel, and the like are equipped with a backlight unit for diffusing and illuminating light.

The surface state of each of the various film sheets constituting the backlight unit through a separate inspection process of the assembled backlight unit to perform such a function. Defects and defects are checked by confirming the state of lamination between the sheets and the light-supplying performance inhibiting factors such as foreign matter or air introduced in the lamination process.

In the inspection process of the backlight unit, various defects are confirmed by acquiring an image by photographing the state of the backlight unit by using the vision camera device, and checking various defects. The top surface of the backlight unit placed at atmospheric pressure state is photographed There is a problem that certain defective elements are not specified in confirming defects.

Accordingly, an inspection process for detecting a specific defective element by using an inspection camera after the backlight unit is directly pressurized by an operator on the upper surface and the degree of contact between the laminated films and the degree of planarity is further improved. However, As the operator has to control the inspection process directly, the efficiency and the degree of the result are not constant and the worker's condition is affected.

Efforts have been made to automate and mechanize the pressurization of the backlight unit in the pressure inspection process in order to solve this problem. Prior art documents related to the related arts include Korean Patent Application No. 10-2011-0138497 entitled "Backlight Unit Inspection Device "(hereinafter referred to as " prior art ").

However, in the case of backlight unit pressure inspection devices including the prior art. In order to increase the airtightness of the space by pushing a part of the top surface of the uppermost side of the film laminate structure including the outside of the mold frame of the backlight unit to form a closed space and pressing the space, Or more of the total thickness of the backlight unit, and as a result, there is a problem that the laminated structure of the laminated film is changed in the pressing and squeezing release process, or it acts as a force for causing a defect in a certain part of the whole backlight unit.

In addition, considering such a problem, if the degree of the external force applied to the pressing is lowered, a sufficient space is not sealed, thereby reducing the accuracy and precision of the pressure inspection, and the inspection process of the backlight unit separates the backlight unit and the protective sheet The leakage of the air pressure due to the insufficient degree of sealing has a problem of changing the seating position of the protective sheet.

It is an object of the present invention to provide a backlight unit which is capable of detecting a defect through an inspection camera by applying a certain level of pressure to the backlight unit, And to provide a technique for identifying a specific defect element through automation and mechanization in a state where the degree of tie-up is increased.

It is another object of the present invention to provide a backlight unit which is capable of automatically exerting an external force through direct contact with a backlight unit, And to provide a technique capable of eliminating the occurrence of structural and mechanical defects of the backlight unit by the light emitting diode.

In order to solve the above problems, the present invention has been developed to solve the above-mentioned problems. In the inspection process of the backlight unit, the protective sheet, which is separated from the backlight unit and placed on the upper surface of the same jig, So as to prevent any error from occurring when the inspection is completed and then reattached.

According to an aspect of the present invention, there is provided an apparatus for inspecting a backlight unit including: a movable jig having a backlight unit; A position moving device for moving the moving jig to be positioned at an arbitrary inspection position; A pressing device for pressing the backlight unit by supplying a pneumatic pressure into the closed inner space, forming a space in a closed state in which the backlight unit is positioned inside the upper surface of the moving jig moved to the first inspection position through the position moving device, ; An inspection camera for photographing the backlight unit pressed by the pressure device; And a control device for controlling each operation of the position moving device, the pressure device, and the inspection camera.

Here, the pressure device may include: a pressing body having an open mouth communicating with the inner space on one side of the moving jig, the other side of the inspection camera being covered with a transparent material; A pressing body mover for adjusting a phase of the pressing body; And a pneumatic pressure generator connected to the inner space of the pressure body to provide a predetermined air pressure to the inner space of the pressure body, wherein a size of an opening on one side of the pressure body is larger than a frame size of the backlight unit, When one side of the pressing body is pressed to the moving jig side through the pressing body moving device, one side of the pressing body is pressed against the upper surface of the moving jig to seal the inner space of the pressing body.

The moving jig may include: a first seating part having a seating groove for seating the backlight unit; And a lighting unit for applying power to the light emitting device of the backlight unit that is seated on the first seating unit, wherein the one side of the pressing body is positioned on the seating groove rim of the first seating unit, And controls the pressing body mover so that the pressing body contact with the outer peripheral portion.

Here, the control device controls the lighting unit so that the inspection camera can photograph the backlight unit, which has been pressed by the pressing device, in a lighted state.

The first seating part is provided with a plurality of first vacuum holes capable of fixing the backlight unit through vacuum suction, and the backlight unit testing device includes a first vacuum hole on the first seating part of the moving jig, And a first adsorption module for generating a connected pneumatic pressure.

The moving jig may further include a second seat on which a protective sheet attached to the backlight unit is seated and includes a plurality of second vacuum holes capable of fixing the seated protective sheet by vacuum suction, The backlight unit inspection apparatus further includes a second adsorption module connected to the second vacuum hole on the second seating portion of the moving jig to generate a vacuum pressure.

The backlight unit inspection apparatus includes: Further comprising an inspection unit provided in at least one or more inspection apparatuses for inspecting additional defects and defects of the backlight unit that has been inspected in the state of being pressurized through the pressurizing apparatus and the inspection camera, The control unit controls the position moving device so that the moving jig on which the backlight unit having been inspected is mounted moves to each of the other inspection positions.

The present invention has the following effects.

First, in confirming various defects of the backlight unit placed on the moving jig through the inspection camera, the backlight unit is pressed through the pressurizing unit in a closed space to form a tangential It is possible to check defective elements which are not detected in the vision inspection process of the backlight unit placed at atmospheric pressure or to confirm the defect elements more accurately.

Secondly, in order to perform the pressing of the backlight unit, the pressing device moves to the moving jig side so that the backlight unit is positioned in the inner space of the pressing body. In the pressing process, It is possible to prevent direct contact between the one side of the pressurized body and the backlight unit and generation of external force.

Thirdly, only a pressing effect of the laminated structure in the backlight unit due to the air pressure is provided, and it can be induced as a direct external force of the backlight unit is applied due to no external force generated by pressing on a part of the backlight unit by the pressing body The factors of occurrence of the laminated structural or mechanical defects can be fundamentally solved.

Fourthly, in order to prevent leakage of air pressure from the main body of the pressurizing process in the pressurizing process, or to remove the backlight unit from the jig during the movement of the jig for further inspection process, The position of the seat can be fixed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a compression type of a pressing jig of a pressing body by operation of a pressing device according to the present invention, with reference to a width direction of the moving jig.
FIG. 2 is a view showing the compression type of the pressing jig of the pressing body by the operation of the pressing device of the present invention with reference to the longitudinal direction of the moving jig.
3 is a plan view showing the structure of a pressurized body in the pressurizing device of the present invention.
4 is a conceptual view for explaining a squeezing area for forming a closed space of the pressing body by the operation of the pressing device of the present invention.
5 is a side view showing a first inspection position part of the backlight unit inspection apparatus of the present invention.
6 is a plan view showing a backlight unit inspection apparatus of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for the sake of brevity.

<Description of Components of Backlight Unit Inspection Device>

Referring to FIGS. 1 to 5, the backlight unit inspection apparatus 1000 of the present invention includes a moving jig 100; A position moving device 200; A pressure device 300; An inspection camera 400 and a control device 500.

The movable jig 100 is a space that is seated and supported as a backlight unit. The backlight unit B, which is seated in the moving jig 100 of the present invention, Diffusion film, first prism film. A second diffusing film, a light-shielding film, a protective film, and the like are sequentially stacked and assembled.

The moving jig 100 for changing the position of the backlight unit B by moving the backlight unit B while supporting the backlight unit B on the inspection process through the backlight unit inspection apparatus 1000 of the present invention is specifically a backlight unit B And a second seating portion 120 corresponding to a portion where the protective sheet S separated from the backlight unit is placed on the upper surface of the jig.

This is because the protective sheet S must be separated from the backlight unit B in order to perform the inspection process and when the backlight unit B is provided to the outside after the inspection process is completed, The moving jig 100 used in the backlight unit inspection apparatus 1000 of the present invention is preferably divided into two regions as shown in FIGS. 2 and 5, Do.

A plurality of first vacuum holes 110H and a second vacuum hole 110H for fixing the phases of the objects B and S placed on the respective first and second seating portions 110 and 120 through vacuum adsorption, Holes 120H are provided and the vacuum holes 110H and 120H are connected to the adsorption module 600 provided in the form of a vacuum ejector.

5, the backlight unit B placed in the seating groove 115 of the first seating part 110 includes a plurality of first vacuum holes 110H connected to the first suction module 610, The protective sheet S placed on the second seating part 120 is fixed to the first seating part 110 by receiving a vacuum attraction force as the air is sucked through the second seating part 120, 2 vacuum hole 120H, and is fixed to the second seat 120 by receiving vacuum attraction force.

A flexible material application portion having a wire structure connected to a light emitting element such as an LED element of the backlight unit B placed on the peripheral portion of the first seating portion 110 Is provided with a lighting part 130 which can contact the conductive pin member of the application part for applying power to the light emitting element such as the LED element of the backlight unit B. [

The lighting unit 130 allows each of the inspection processes to be performed in a state in which the backlight unit B is lighted so that no separate light providing means is required in the constitution constituting the inspection apparatus.

The position moving device 200 is a driving element that is connected to a lower portion of the moving jig 100 and is capable of moving the moving jig 100 so as to be positioned at an arbitrary position (specifically, each inspection position) along a certain guide rail A rotary plate 200 for rotating the movable jig 100 on a work plate in the form of a rotary table as shown in FIG. 6, and the like.

6, the moving jig 100 sequentially moves from a position where the first backlight unit is seated through the position moving device 200 to at least one inspection position TP1, TP2, TP3, TP4, etc. Can be moved.

Further, the position moving apparatus 200 can move the moving jig 100, which has been inspected, to a position for reattaching the protective sheet S to the backlight unit B and a position for reattaching the protective sheet S to the backlight unit B, Or a position for unloading the battery.

First, the apparatuses constituting the present invention at the first inspection position TP1 in which a vision inspection through pressure is performed will be described. The pressure device 300 and the inspection camera 400 are provided.

The pressing device 300 forms a predetermined space AT in a closed state on the upper surface of the moving jig 100 moved to the first inspection position TP1 through the position moving device 200, The backlight unit B is positioned in the backlight unit. Thereafter, the pressurizing device 300 pressurizes the backlight unit B by supplying air pressure to a certain space (AT) in a closed state.

As a result, the various film layers constituting the film laminate structure of the backlight unit (B) are more closely adhered to each other, so that the degree of contact is higher than that at the atmospheric pressure, and the vision inspection in such a state is carried out by a vision inspection It is possible to detect even defective elements that are not identified or detected to a low degree.

The moving jig 100 moved to the first inspection position TP1 and the state of the backlight unit B in the internal space AT of the pressurizing device 300 in the closed state An inspection camera 400 for photographing and inspecting an image is installed.

The operations of the position moving device 200, the pressure device 300, the inspection camera 400, the suction module 600, and the like are controlled through the control device 500.

Here, the pressurizing device 300 includes a pressurizing body 310 for forming a predetermined space AT in a closed state by pressing and moving on the upper surface of the moving jig 100 directly moved to the first inspection position TP1, The same pressing body 310 is moved to the first inspection position TP1 so that the back body unit B is pressed on the upper surface of the moving jig 100 to form a space or to release the pressing body 310. [ And a pressing body shifter 320 as a moving element for adjusting the phase in left and right, up and down, and back and forth.

The pressurizing device 300 includes an air inlet AH connected to one side of the pressurizing body 310 to supply pressurized air to the internal space AT of the pressurizing body 310, Generator 330. &lt; / RTI &gt;

The pressing device 300 is configured to elastically press the protective sheet S placed on the second seating portion 120 of the moving jig 100 moved to the first checking position TP1 to provide a position fixing force And an elastic arm 340 for preventing detachment.

1 and 2, the pressing body 310 is coupled to the inner space AT on one side 310T, which is opposite to the upper surface of the moving jig 100 moved to the first inspection position TP1, An opening H which is open to be opened is formed.

The open space of one side 310T of the pressing body 310 may cover the outside of the backlight unit B and a portion of the one side 310T that is not opened and has a surface may cover the backside of the moving jig 100. [ Direct contact with the top surface is created through compression to provide a certain degree of hermeticity in the internal space (AT).

The size of the opening H in which a center portion of the one side 310T of the pressing body 310 is developed and formed is determined in accordance with the horizontal and vertical lengths of the rectangular shape, And is provided so as to have a larger size.

This is achieved by moving the pressing body 310 to the moving jig 100 side by pressing the pressing body moving device 320 under the control of the control device 500 as shown in the enlarged view of FIG. 1 and FIG. 2, The one side 310T of the pressure body 310 does not come in contact with the backlight unit B placed in the seating groove 115 of the first seating portion 110 and the outer peripheral portion of the first seating portion 110, The pressing force is applied to the upper surface of the moving jig 100 to seal the inner space AT of the pressing body 310 so as to pressurize the backlight unit B on the laminated structure through the air pressure in the closed space, So that the direct external force generated by the one side surface 310T of the pressing body 310 is excluded.

That is, a region where one side 310T of the pressing body 310 is pressed against the upper surface of the moving jig 100 to perform pressing will be described in detail with reference to FIG.

The backlight unit B is placed in the seating groove 115 of the first seating portion 110 and the peripheral portion 115ET corresponding to the outer side of the edge 115E of the seating groove 115 is pressed against the pressing body 310 are brought into contact with each other to perform the compression bonding.

In any case, this structural feature does not directly damage the surface of the film due to direct contact with the backlight unit (B) or affect the deformation of the laminate structure between the films or cause damage to certain parts.

At least one transparent cover member C is provided on the other side 310V of the pressing body 310 corresponding to the opposite side of the pressing body 310 to press the inspection camera 400 310 can provide the state of the backlight unit B placed in the internal space AT.

4, a side surface 310T of the pressing body 310 is positioned on the side of the moving jig 100 (see FIG. 4) So that it is possible to observe a sufficient inner space (AT) with an enlarged size larger than the outer periphery 115ET of the rim 115E of the seating groove 115 which performs the pressing.

Next, the pressing body 310 is disposed on the upper surface of the moving jig 100 through the pressing body moving unit 320, and the inner space AT in which the backlight unit B is positioned is sealed by pressing Then, the control device 500 drives the air pressure generator 330 inside to supply the air pressure to the internal space AT, thereby raising the internal air pressure.

For this, a plurality of air inlets (AH) communicating with the air pressure generator (330) and one side are connected to the inner space (AT) along the rim of the pressure body (310).

As shown in FIG. 3, the plurality of air inlets AH are arranged symmetrically with respect to the length and width direction of the body, so that the air supplied to the inside of the air inlets AH is balanced As shown in Fig.

This is to solve the problem that the distribution of the region to be pressed on the upper surface of the backlight unit B is not balanced and deflected to one side at the initial stage of air pressure supply as air is injected from one direction into the inside.

In the inspection process in which the inspection camera 400 photographs the backlight unit B that has been pressurized in the internal space AT through the pressurizing body 310 and the air pressure generator 330 to check the cause of the defect, The control unit 500 controls the lighting unit 130 to emit light to the backlight unit B in order to provide it without any additional configuration.

As shown in FIG. 5, the pressing body 310 forms an enclosed inner space AT at the periphery of the first seating portion 110, The pressure seat 310 is installed at a position spaced apart from the pressure body 310 so as to elastically press the protective sheet S placed on the second seat portion 120 in the process.

The pressing body moving device 320 moves in conjunction with the movement of the pressing body 310 under the control of the control device 500 so that the pressing body 310 presses the backlight unit B The elastic pressing force is applied to the protective sheet S placed on the second seat portion 120. [

This is a safety device for fixing the seating position of the protective sheet S without being influenced even when a slight amount of air is released from the pressure body 310 or air is leaked due to abnormality of the degree of compression.

This is the same as the second adsorption module 620 connected to the plurality of second vacuum holes 120H formed in the second seating part 120. [

The control device 500 controls the position moving device 200 so that the backlight unit B is seated in the first inspection position TP1 through the same configuration as described above, TP3, and TP4 to move to the remaining inspection positions TP2, TP3, and TP4.

Therefore, the backlight unit inspection apparatus 1000 according to the present invention includes at least one inspection apparatus 710, 720, 730, and 740 for inspecting additional defects and defects of the backlight unit B that has undergone the pressure inspection, (700).

The first inspection apparatus 710 may be a luminance inspection camera for performing the luminance and chromaticity coordinate total inspection of the backlight unit B according to an embodiment of the present invention. .

Next, the second inspection apparatus 720 photographs the upper surface of the backlight unit B in the vertical direction, the longitudinal direction and the width direction of the backlight unit B, thereby obtaining a laminated structure of the laminated films of the backlight unit B, And is provided with a plurality of inspection cameras and angle adjusting devices for checking the presence or absence of defects such as scratches, soot, and foreign substances on the surface in various aspects.

The third inspection apparatus 730 may be an inspection apparatus for measuring the uniformity degree of light at the same inspection position as the second inspection apparatus 720 and the fourth inspection apparatus 740 may be provided as a low current inspection apparatus .

6, the moving jig 100 positioned at the first inspection position TP1 is moved to the position (position) of the first inspection position TP1, The moving device 200 moves to the second inspection position TP2 and undergoes the brightness inspection process.

After that, the moving jig 100 moved to the third inspection position TP3 passes through the inspection process related to the multifaceted vision inspection and the light uniformity and finally moves to the fourth inspection position TP4, .

This is the configuration and arrangement of the inspection unit according to one embodiment, but it is not limited thereto and various designing devices such as a series of design changes are possible.

The moving jig 100 which has completed the inspection process of the backlight unit B is moved to the position where the protective sheet attaching device 800 is installed by the position moving device 200 and the protective sheet attaching device 800 is moved The protective sheet S fixedly attached to the second seat portion 120 is attached again to the backlight unit B. [

When the process of reattaching the protective sheet S is completed, the moving jig 100 is moved to the position where the backlight unit removing apparatus 900 is installed by the position moving apparatus 200, and the backlight unit removing apparatus 900 ) Will provide the backlight unit B, which has been inspected and reattached with the protective sheet S, to the outside through automation.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection is to be construed in accordance with the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

1000: backlight unit inspection device
100: Moving jig
110: first seat portion 115: seat groove
110H: first vacuum hole
120: second seat portion 120H: second vacuum hole
130:
200: Position shifting device
300: Pressure device
310: Pressurizing body 320: Pressurized body moving device
330: Air pressure generator
400: Inspection camera
500: control device
600: Adsorption module
610: first adsorption module 620: second adsorption module
700: Inspection unit
710: first inspection apparatus 720: second inspection apparatus
730: third inspection device 740: fourth inspection device
800: Device for attaching protective sheet
900: Backlight unit detachment device
B: Backlight unit
S: Protective sheet

Claims (7)

A moving jig on which the backlight unit is seated;
A position moving device for moving the moving jig to be positioned at an arbitrary inspection position;
A pressing device for pressing the backlight unit by supplying a pneumatic pressure into the closed inner space, forming a space in a closed state in which the backlight unit is positioned inside the upper surface of the moving jig moved to the first inspection position through the position moving device, ;
An inspection camera for photographing the backlight unit pressed by the pressure device; And
And a control device for controlling each operation of the position moving device, the pressure device, and the inspection camera
Backlight unit inspection device.
The method according to claim 1,
The pressure-
A pressing body formed on one side surface of the moving jig and having an opening communicating with the inner space, the other side of the inspection camera being covered with a transparent material;
A pressing body mover for adjusting a phase of the pressing body; And
And an air pressure generator connected to the internal space of the pressurized body to provide a predetermined air pressure to the internal space of the pressurized body,
Wherein a size of the opening on one side of the pressing body is larger than a frame size of the backlight unit so that when one side of the pressing body is pressed to the side of the moving jig through the pressing body moving unit, So as to seal the inner space of the pressing body by being pressed against the upper surface of the moving jig
Backlight unit inspection device.
3. The method of claim 2,
The moving jig includes:
A first seating part having a seating groove for seating the backlight unit; And
And a lighting unit for applying power to the light emitting device of the backlight unit seated on the first seating unit,
Wherein the control device controls the pressing body moving device so that one side of the pressing body is in contact with the outer periphery of the seating groove outside the seating groove of the first seating part of the moving jig,
Backlight unit inspection device.
The method of claim 3,
Wherein the control device controls the lighting unit so that the inspection camera can photograph the backlight unit, which has been pressed by the pressure device, in a lighted state
Backlight unit inspection device.
The method of claim 3,
Wherein the first seat portion is provided with a plurality of first vacuum holes capable of fixing the backlight unit through vacuum suction,
The backlight unit inspection apparatus includes:
And a first adsorption module connected to the first vacuum hole on the first seating part of the moving jig to generate a vacuum pressure,
Backlight unit inspection device.
6. The method of claim 5,
The moving jig includes:
And a second seat having a plurality of second vacuum holes on which a protective sheet attached to the backlight unit is seated and capable of fixing the seated protective sheet through vacuum suction,
The backlight unit inspection apparatus includes:
And a second adsorption module connected to the second vacuum hole on the second seating portion of the moving jig to generate a vacuum pressure.
Backlight unit inspection device.
The method according to claim 1,
The backlight unit inspection apparatus includes:
Further comprising an inspection unit provided in at least one or more inspection apparatuses for inspecting additional defects and defects of the backlight unit that has been inspected in the state of being pressurized through the pressurizing apparatus and the inspection camera,
Wherein the control device controls the position moving device so that the moving jig that places the backlight unit that has been inspected from the first inspection position moves to each of the remaining inspection positions
Backlight unit inspection device.

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