KR100826097B1 - Back light unit inspecting apparatus of lcd - Google Patents

Abstract

A back light unit inspection apparatus for an LCD(Liquid Crystal Display) is provided to increase the accuracy of the inspection by adjusting an inspection camera toward up, down, left and right sides. A rotation body(20) is combined with a body by a shaft and has a receiving jig(22). A protection film removing member(30) is received by the receiving jig and removes the protection film of the back light unit moved through the rotation body. The first back light unit inspecting body(40) inspects the defects within a screen at the horizontal direction of the back light unit. The second back light unit inspecting body(50) inspects the defects of the screen vertically toward the vertical direction of the firstly inspected back light unit. The third back light unit inspecting body(60) inspects defects within the screen at the front of the secondly inspected back light unit. A protection film attaching member(70) attaches a protection film on the thirdly inspected back light unit. The protection film attaching member includes an ejecting member for ejecting selectively the back light units with good quality.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a backlight unit inspecting apparatus for a liquid crystal display

1 is a perspective view illustrating a backlight unit testing apparatus of a liquid crystal display according to an exemplary embodiment of the present invention,

FIG. 2 is a cross-sectional view of a backlight unit inspection apparatus of the LCD shown in FIG. 1, which includes a rotating body, a protective film removing unit, a backlight unit primary inspection unit, a backlight unit secondary inspection unit, A plan view showing a takeout means for taking apart the attachment means and the good and defective products,

FIG. 3 is a side view of a main body and a rotating body employed in the backlight unit testing apparatus of the liquid crystal display shown in FIG. 1;

FIG. 4 is a perspective view showing a rotatable housing jig and a backlight unit housed therein in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2;

FIG. 5 is a plan view showing the protective film removing means employed in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2;

FIG. 6 is a plan view showing a backlight unit primary inspection body employed in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2;

FIG. 7 is a plan view showing a backlight unit secondary inspection body employed in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2;

FIG. 8 is a plan view showing a backlight unit tertiary inspection body employed in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2;

9 is a plan view showing a protective film attaching means employed in the backlight unit inspecting apparatus of the liquid crystal display apparatus shown in FIG. 2,

10 is a plan view showing take-out means for taking out good products and defective products used in the backlight unit inspection apparatus of the liquid crystal display shown in FIG.

Description of the Related Art [0002]

1: Backlight unit inspection device of liquid crystal display device 10:

11: Leveling member 12: Caster

20: rotating body 21: spindle

22: Storage jig 23:

30: Protective film removing means 31: First protective frame

32: first horizontal frame 33: first vertical frame

34: protective film removing unit 40: backlight unit primary inspection body

41: second support frame 42: second horizontal frame

43: first camera section 50: backlight unit secondary inspection body

51: third support frame 52: third horizontal frame

53: second camera section 60: backlight unit tertiary inspection body

61: fourth support frame 62: fourth bracket

63: Camera fixing frame 64: Area camera

70: protective film attaching means 71: fifth support frame

72: fifth horizontal frame 73: fifth vertical frame

74: protective film attaching portion 80: defective takeout means

81: sixth support frame 82: sixth frame

83: Backlight extraction unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit inspection apparatus, and more particularly, to a backlight unit inspection apparatus in which an assembled back light unit is mounted on a housing jig on which a light- And then the defective backlight unit is taken out to greatly reduce the inspection time and the cost, as well as a backlight unit inspection apparatus for a liquid crystal display device.

Generally, a backlight unit for converting light (light) emitted from a light source into plane light is essentially used in a display device such as a liquid crystal display (LCD). Such a backlight unit includes a light source for generating light, And a laminate structure including a diffuser plate for diffusing the light toward the front side through the light guide plate, and other polarizer plates. The light guide plate has a laminated structure including a light guide plate for uniformly spreading over the entire surface, a reflecting plate for reflecting light exiting toward the back side of the light guide plate toward the light guide plate.

Therefore, when a backlight unit is manufactured, a reflection plate, a diffusion plate, a polarizing plate, and the like are laminated on a light guide plate including a light source. In this case, not only foreign substances can enter between the plates, but also stains or scratches A light guide plate, a reflection plate, a diffusion plate, or a polarizing plate may be laminated, so that various defects such as foreign substances, white spots, black spots, stains, and scratches are likely to occur in the backlight unit.

Korean Unexamined Patent Application Publication No. 10-2006-42502 (May 05, 2005) entitled " Automatic defect inspection apparatus for backlight unit using image processing technology " The prior art discloses a defect inspection apparatus for a backlight unit for inspecting whether or not there are various defects such as foreign matter, white spot, black spot, spots and scratch on an assembled backlight unit, and has an inlet and an outlet on both sides A body on which a test chamber is formed; A guide rail extending through the inlet of the main body, the inspection chamber and the outlet sequentially; A light fixture movably installed on the guide rail, and a backlight unit mounted on the guide rail so as to be lighted; A vertical image acquiring camera installed in an inspection room of the main body and vertically line-scanning the backlight unit on the lighting jig; A camera for acquiring a viewing angle image, which is installed in an inspection room of a main body and line-scanned the backlight unit on the lighting jig at a predetermined tilt angle; An image processing and control unit installed in a lower portion of the main body, for controlling defects of the backlight unit by collectively processing images obtained by the cameras while controlling the cameras; And inspection result output means provided on one side of the main body for displaying and outputting defects of the backlight unit detected by the image processing and control means.

Although the prior art has an advantage in that the inspection time can be shortened compared with the conventional visual inspection, the means for detecting the defective backlight unit is not disclosed, and there is a disadvantage in that it is necessary to take out work manually.

In addition, although the inspection camera can be adjusted up and down, there is a disadvantage that the use area is limited because there is no function to adjust the camera right and left.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of increasing the accuracy of inspection by taking out a defective backlight unit and adjusting an inspection camera up, Backlight unit inspection apparatus.

To achieve the above object, the present invention provides an apparatus for inspecting a backlight unit of a liquid crystal display (LCD) device by checking whether or not various defects such as foreign substances, white spots, black spots, spots and scratches are present on the assembled backlight unit , main body; A rotating body including a rotating plate axially coupled to the body and having a receiving jig coupled to an upper portion of the rotating plate and having a receiving groove formed therein; A protective film removing means provided at an upper portion of the main body and including a protective film removing unit for removing the protective film of the backlight unit housed in the receiving groove; A backlight unit primary inspection body provided on an upper portion of the main body and having a first scan camera for inspecting horizontal directional stains or scratches of the backlight unit moved by the rotating body after the protective film is removed; A backlight unit secondary inspection body provided on an upper portion of the main body and including a second scan camera for inspecting a vertical direction speck or scratch of the backlight unit moved through the backlight unit primary inspection body; A backlight unit tertiary inspection body provided on an upper portion of the main body and having an area camera for inspecting a foreign object of the backlight unit moved through the backlight unit secondary inspection body; A protective film attaching means provided at an upper portion of the main body and having a film adsorption pressing portion for attaching a protective film of the backlight unit moved through the backlight unit tertiary inspection body; And a take-out means provided on an upper portion of the main body, the take-out means including a take-off spool for taking out the good defective backlight and the defective backlight moved through the protective film attaching means. The backlight unit primary inspection body includes: A second support frame, a second ball screw coupled to the upper side of the second support frame and rotatably coupled to the second ball screw, a second horizontal drive motor fixed to the second ball screw to rotate the second ball screw, A second bracket coupled to the second sliding portion, and a second scan unit coupled to the second bracket to scan a backlight unit in a horizontal direction for a first scan There is provided a device for inspecting a backlight unit of a liquid crystal display device, comprising a first camera unit having a camera.

FIG. 1 is a perspective view illustrating a backlight unit testing apparatus of a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of a backlight unit testing apparatus of the liquid crystal display apparatus shown in FIG. And a backlight unit primary inspection body, a backlight unit secondary inspection body, a backlight unit, a third inspection body, a protective film attaching means, and a takeout means for separating and removing good and defective products.

An apparatus for inspecting a backlight unit of a liquid crystal display according to a preferred embodiment of the present invention includes a main body 10, a rotating body 20 axially coupled to the main body 10 by a rotating shaft and having a receiving jig 22, A protective film removing means 30 for removing the protective film of the backlight unit stored in the storage jig 22 and moved through the rotating body 20, A backlight unit secondary inspection unit 50 for inspecting defects in the screen in the vertical direction of the first inspected backlight unit, a second inspection unit 50 for inspecting the backlight unit for the second inspection, A protective film attaching unit 70 for attaching a protective film to the backlight unit inspected at the third time, and a protective film attaching unit 70 for moving the protective film attaching unit 70 The good good and the defective backlight unit are taken out separately And a take-out means (80).

FIG. 3 is a side view showing a main body and a rotating body employed in the backlight unit testing apparatus of the liquid crystal display shown in FIG. 1, and FIG. 4 is a side view showing the main body and the rotating body employed in the backlight unit testing apparatus of the liquid crystal display shown in FIG. And a backlight unit housed in the housing.

The main body 10 forms a frame of the backlight unit inspection apparatus 1 of the liquid crystal display device according to the present invention and includes a horizontal adjusting member 11 serving as a horizontal adjusting unit and a roller serving as a roller when moving the main body 10 The caster 12 is bolted. Although not shown in the figure, a control unit having a liquid crystal screen display is provided on the upper portion of the main body 10. [

The rotating body 20 preferably has a disk-like rotating plate 21 and a plurality of receiving grooves 22a formed uniformly on the outer circumferential edge of the rotating plate 21 and formed with a lighting body 22b A storage jig 22 and a rotary shaft mounted vertically to the lower portion of the rotary plate 21. [

Specifically, the rotary shaft is inserted into a cylindrical housing (not shown) and supported by a bearing (not shown), and the lower portion of the rotary shaft is coupled to a driving motor (not shown) such as a stepping motor by a coupling (not shown) . ≪ / RTI >

The lighting unit 22b is connected to the power connection connection terminal 22ba and is turned on as shown in FIG. 4. In the middle, a plurality of lamps are arranged in a rectangular shape.

Further, the control unit of the lighting unit 22b can simultaneously light the backlight unit of the inspection position with one power source, and the current flowing through the lighting unit 22b can be precisely controlled. By doing so, there is an advantage that the current flowing through the light-emitting body 22b can be kept constant and the inspection error for the light brightness difference can be remarkably reduced.

4, the supporting jig 22 is provided with a supporting rod 22c for elastically pressing and supporting one side of the backlight unit. Specifically, the supporting jig 22 includes a rotation support shaft The spring 22e is inserted into the end of the pivotal support shaft 22d so that one side of the spring 22e is supported on one side of the support rod 22c.

Further, the storage jig 22 is provided with a pair of receiving grooves 22a, and a pair of backlight units to be inspected is placed thereon. Therefore, there is an advantage that the pair of backlight units can be simultaneously inspected by inspection members 50, 60, and 70 to be described later.

FIG. 5A is an exploded plan view showing a protective film removing means employed in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2, and FIG. 5B is an assembled side view showing a state in which the protective film removing means is coupled to the main body.

The protective film removing means 30 includes a first support frame 31 bolted to the upper side of the main body 10, a first horizontal frame 32 bolted to the upper portion of the first support frame 31, A first vertical frame 33 bolted to the upper part of the first horizontal frame 32 and a protective film removing part 34 bolted to one side of the first vertical frame 33.

The first horizontal frame 32 includes a first horizontal ball screw 32a rotatably installed therein as shown in FIG. 5A, a second horizontal ball screw 32b rotatably mounted on the first horizontal ball screw 32a, A motor 32b and a first horizontal sliding part 32c which is screwed on the first horizontal ball screw 32a and is moved forward and backward by engaging with the threads of the first horizontal ball screw 32a.

The first vertical frame 33 includes a first vertical ball screw 33a rotatably installed therein as shown in FIG. 5A, a first vertical driving motor 33a for rotating the first vertical ball screw 33a, And a first vertical sliding part 33c screwed on the first vertical ball screw 33a and moved forward and rearward by being engaged with the threads of the first vertical ball screw 33a.

As shown in FIG. 5A, the protective film removing unit 34 includes a removal body 34a bolted to the first vertical sliding part 33c and a bolt- And a pair of spaced protective film desorption rings 34b. Preferably, a known adsorption unit (not shown) is bolted to the removal body 34a to prevent the detached protective film from falling on the floor.

FIG. 6A is an exploded plan view showing a backlight unit primary inspection body employed in the backlight unit inspection apparatus of the liquid crystal display apparatus shown in FIG. 2, and FIG. 6B is an exploded plan view showing an assembled side view showing a state in which the backlight unit primary inspection body is coupled to the body. to be.

The backlight unit primary inspection body 40 includes a second support frame 41 bolted to the upper side of the main body 10 and a second horizontal frame 42 bolted to the upper side of the second support frame 41, And a first camera unit 43 which is bolted to one side of the second horizontal frame 42.

The second horizontal frame 42 includes a second ball screw 42a rotatably coupled to the inside as shown in FIG. 6A, a second horizontal driving motor 42b rotating the second ball screw 42a And a second sliding portion 42c screwed on the second ball screw 42a and engaged with the threads of the second ball screw 42a to move back and forth.

As shown in FIG. 6A, the first camera unit 43 includes a second bracket 43a bolted to the second sliding portion 42c, and a second bracket 43b bolted to the second bracket 43a, And a first scan camera 43b for inspecting defects on the screen in the horizontal direction.

2, the first camera unit 43 is oriented in the longitudinal direction of the receiving groove 22a with reference to the longitudinal direction of the receiving groove 22a, that is, with reference to FIG. 2, and this direction is defined as a horizontal direction . Therefore, the first camera section 43 can check whether or not the backlight unit reflected in the horizontal direction is in the screen.

The second and third inspection bodies 50 and 60 to be described later as well as the backlight unit primary inspection body 40 are provided with a robot which is movable in x, y, and z directions to control the position of the camera It is possible to precisely control the position of the camera by installing it.

FIG. 7A is an exploded plan view showing a backlight unit secondary inspection body employed in the backlight unit inspection apparatus of the liquid crystal display shown in FIG. 2, and FIG. 7B is an exploded perspective view showing a coupled side view to be.

The backlight unit secondary inspection body 50 includes a third support frame 51 bolted to the upper side of the main body 10 and a third horizontal frame 52 bolted to the upper side of the third support frame 51, And a second camera unit 53 bolted to one side of the third horizontal frame 52.

The third horizontal frame 52 includes a third ball screw 52a rotatably coupled to the inside as shown in FIG. 7A, a third horizontal driving motor 52b rotating the third ball screw 52a And a third sliding part 52c screwed on the third ball screw 52a and meshed with the thread of the third ball screw 52a to move back and forth.

7A, the second camera unit 53 includes a third bracket 53a bolted to the third sliding unit 52c and a third bracket 53b bolted to the third bracket 53a to connect the backlight unit 1 And a second scan camera 53b for inspecting the in-screen defect in the vertical direction of the backlight unit that has passed through the inspection object 40. [

The second camera portion 53 is oriented in the lateral direction of the receiving groove 22a with reference to FIG. 2, and defines this direction as a vertical direction. Therefore, the second camera unit 53 can check whether or not the backlight unit reflected in the vertical direction is defective on the screen.

FIG. 8A is an exploded plan view showing a backlight unit tertiary inspecting body employed in the backlight unit inspecting apparatus of the liquid crystal display shown in FIG. 2, and FIG. 8B is an exploded perspective view of the back side inspecting body of the backlight unit, to be.

The backlight unit third inspection body 60 includes a fourth support frame 61 bolted to the upper side of the main body 10, a fourth bracket 62 bolted to the upper side of the fourth support frame 61, A camera fixing frame 63 bolted to the upper side of the fourth bracket 62 and having a gap adjusting gauge 63a and a camera fixing frame 63 bolted to the camera fixing frame 63 to inspect the backlight unit for defects And an area camera 64.

FIG. 9A is an exploded plan view showing a protective film attaching means employed in the backlight unit inspecting apparatus of the liquid crystal display shown in FIG. 2, and FIG. 9B is an assembled side view showing a state in which the protective film attaching means is attached to the body.

9A, the protective film attaching means 70 includes a fifth support frame 71 bolted to the upper side of the main body 10 and a fifth support frame 71 bolted to the upper side of the fifth support frame 71, A fifth vertical frame 73 bolted to the upper side of the fifth horizontal frame 72 and a protective film attaching portion 74 bolted to one side of the fifth vertical frame 73 ).

The fifth horizontal frame 72 includes a fifth horizontal ball screw 72a rotatably coupled to the inside as shown in FIG. 9A, a fifth horizontal driving motor 72a for rotating the fifth horizontal ball screw 72a, And a fifth horizontal sliding portion 72c which is screwed on the fifth horizontal ball screw 72a and is moved forward and backward by engaging with the threads of the fifth horizontal ball screw 72a.

The fifth vertical frame 73 includes a fifth vertical ball screw 73a bolted to the upper portion of the fifth horizontal sliding portion 72c and rotatably coupled to the upper portion of the fifth horizontal sliding portion 72c as shown in FIG. A fifth vertical driving motor 73b that rotates the fifth vertical ball screw 73a and a fifth vertical driving screw 73b that is screwed on the fifth vertical ball screw 73a and is moved forward and rearward by meshing with the threads of the fifth vertical ball screw 73a And a fifth vertical sliding portion 73c.

As shown in FIG. 9A, the protective film attaching portion 74 includes a pair of spaced film-attached bodies 74a bolted to one side of the fifth vertical sliding portion 73c, And a known film attracting and pressing portion 74b which is bolted to the lower portion of the frame.

Fig. 10A is an exploded plan view showing the inspection means for taking out the inspected backlight employed in the backlight unit inspection apparatus of the liquid crystal display apparatus shown in Fig. 2, and Fig. 10B is an exploded perspective view showing a state in which the inspection means of the backlight, Side view.

The inspected backlight take-out means 80 includes a sixth support frame 81 bolted to the upper side of the main body 10 as shown in FIG. 10A and a second support frame 81 bolted to the upper side of the sixth support frame 81 A sixth frame 82, and a backlight take-out unit 83 bolted to one side of the sixth frame 82.

The sixth frame 82 includes a sixth ball screw 82a bolted to the upper side of the sixth support frame 81 and rotatably coupled to the sixth frame 82 as shown in Figure 10a, A sixth driving unit 82b that rotates the screw 82a and a sixth sliding unit 82c which is screwed on the sixth ball screw 82a and moves forward and rearward by engaging with the threads of the sixth ball screw 82a, .

The backlight take-out unit 83 includes a take-out body 83a bolted to the sixth sliding portion 82c as shown in FIG. 6A, a take-out rod 83b bolted to the take-out body 83a, And a take-out tongue 83c bolted to both ends of the take-out rod 83b and controlled by the control unit to take out the good product and the defective backlight unit.

It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. .

According to the apparatus for inspecting a backlight unit of a liquid crystal display device according to an embodiment of the present invention as described above, it is possible to separate a good product and a defective backlight unit from each other, It is possible to provide an apparatus for inspecting a backlight unit of the apparatus.

Claims (7)

An apparatus for inspecting a backlight unit of a liquid crystal display device for inspecting whether or not any defects such as foreign matter, white spot, black spot, stain, scratch are present on an assembled backlight unit, main body; A rotatable member rotatably coupled to the main body; a rotatable member coupled to an upper portion of the rotatable plate and having a receiving groove formed therein; A protective film removing means provided on an upper portion of the main body and including a protective film removing unit for removing the protective film of the backlight unit stored in the receiving groove; And a first scan camera installed at an upper portion of the main body and inspecting defects in the screen in a horizontal direction of the backlight unit moved by the rotator after the protective film is removed. A backlight unit secondary inspection body provided on an upper portion of the main body and having a second scan camera for inspecting defects in the screen in a vertical direction of the backlight unit moved through the first inspection body; A backlight unit tertiary inspecting body provided on an upper portion of the main body and having an area camera for inspecting defects in the screen from the front of the backlight unit moved through the backlight unit secondary inspecting body; Protective film attaching means provided on the main body and having a film adsorption pressing portion for attaching a protective film of the backlight unit moved through the backlight unit tertiary inspection body; And And a take-out means provided on an upper portion of the main body, the take-out means including a take-out gripper for taking out and separating the defective backlight unit moved by the protective film attaching means, Wherein the backlight unit primary inspection body includes a second support frame provided on the upper side of the main body, a second ball screw coupled to the upper side of the second support frame and rotatably coupled to the inside of the second support frame, A second horizontal frame fixed to the second ball screw and having a second sliding part moved along the second ball screw, a second horizontal frame coupled to the second sliding part, And a first camera unit coupled to the second bracket and having a first scan camera for inspecting defects in the screen in the horizontal direction of the backlight unit. The image forming apparatus according to claim 1, A first support frame installed above the main body; A first horizontal ball screw coupled to an upper side of the first support frame and rotatably installed therein, a first horizontal driving motor for rotating the first horizontal ball screw, a second horizontal ball screw fixed on the first horizontal ball screw, A first horizontal frame having a first horizontal sliding part moved along the first horizontal ball screw; A first vertical ball screw coupled to the first sliding portion and rotatably installed in the first vertical ball screw, a first vertical driving motor rotating the first vertical ball screw, and a second vertical ball screw fixed on the first vertical ball screw, A first vertical frame having a first vertical sliding part moved along a first vertical ball screw; And And a protection film removing unit having a removal body coupled to the first vertical sliding part and a pair of spaced protective film detachable rings coupled to a lower part of the removal body, Inspection device. delete The backlight unit secondary inspection body according to claim 2, A third support frame installed above the main body; A third ball screw coupled to an upper side of the third support frame and rotatably coupled to the third ball screw, a third horizontal drive motor rotating the third ball screw, A third horizontal frame having a third sliding part moved along the three ball screws; And And a second camera unit having a third bracket coupled to the third sliding unit and a second scan camera coupled to the third bracket for inspecting defects in the screen in the vertical direction of the backlight unit. Device for inspecting backlight unit. 5. The backlight unit according to claim 4, A fourth support frame installed above the main body; A fourth bracket coupled to an upper side of the fourth support frame; A camera fixing frame coupled to the upper side of the fourth bracket and having a gap adjustment gauge; And And an area camera coupled to the camera fixing frame for inspecting a defect of the backlight unit. 6. The apparatus according to claim 5, A fifth support frame installed on the upper side of the main body; A fifth horizontal ball screw coupled to an upper side of the fifth support frame and rotatably coupled to the inside of the fifth support frame, a fifth horizontal driving motor for rotating the fifth horizontal ball screw, A fifth horizontal frame having a fifth sliding part moved along the fifth horizontal ball screw; A fifth vertical driving motor coupled to the fifth sliding part and rotatably installed therein, a fifth vertical driving motor for driving the fifth vertical ball screw, and a fourth vertical driving motor fixed on the fifth vertical ball screw, A fifth vertical frame having a fifth vertical sliding part moved along the fifth vertical ball screw; And And a protection film attaching portion having a film attaching body coupled to the fifth vertical sliding portion and a pair of spaced film adsorption pressing portions coupled to the film attaching body. The inspection apparatus according to any one of claims 1, 2, and 4 to 6, A sixth support frame installed above the main body; A sixth ball screw coupled to an upper side of the sixth support frame and rotatably coupled to the sixth ball screw, a sixth drive motor for rotating the sixth ball screw, and a sixth drive motor fixed on the sixth ball screw, A sixth frame having a sixth sliding portion moved along the ball screw; And A take-out body coupled to the sixth sliding portion, a take-out rod coupled to the take-out body, and a take-out portion having a take-out gripper coupled to both ends of the take-out rod.

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