KR100742273B1 - LCD panel foreign material inspection device - Google Patents

Abstract

The present invention relates to a foreign matter inspection apparatus of the LCD panel, in order to inspect the presence of foreign substances between the upper glass and the lower glass, the upper glass and the upper film and the lower glass and the lower film constituting the LCD panel, A camera mounted on top perpendicular to the camera; It is installed on both sides of the camera divided into three angles of view, two reflectors for inducing to cross the center angle of view of the three divided angles of view and the lower than the position where the LCD panel passes through the shooting of the camera It characterized in that it comprises an illumination for supplying the required amount of light.

Description

An apparatus for particle checking of LCD panel

1 is a side view of a foreign substance inspection apparatus according to the prior art.

FIG. 2 is a detailed cross-sectional view of portion A of FIG. 1.

Figure 3 is a side view of the foreign matter inspection apparatus according to an embodiment of the present invention.

4 is a view for explaining the state of use of the foreign matter inspection apparatus according to an embodiment of the present invention.

5 is a detailed cross-sectional view of the portion B of FIG.

<Explanation of symbols for main parts of the drawings>

10: LCD panel inspection equipment 12: feed roller

14: Tray 16: Lighting

20: first camera 22: second camera

30: LCD panel 32: top film

34: upper glass 36: lower glass

38: lower film a1, a2, a3, b1, b2, b3, c1, c2, c3: foreign matter

100: inspection equipment 110: camera

116: illumination 120: first reflecting mirror

130: second reflector

The present invention relates to a foreign matter inspection device of the LCD panel, and more particularly, whether the presence and the presence of foreign matter between the upper glass and the lower glass, the upper glass and the upper film and the lower glass and the lower film constituting the LCD panel. It relates to a device that can be inspected.

An LCD (Liquid Crystal Display) panel is a display device that transmits various electrical information generated by various devices to visual information by using a change in transmittance of liquid crystal according to an applied voltage.

The LCD panel includes a color filter, a liquid crystal layer, and a transistor positioned between two glass plates, and a polarizing filter is attached to an outer surface, and a backlight is used as a light source on the rear surface.

Two glass plates constituting the LCD panel (hereinafter referred to as' top glass' and 'bottom glass' unless otherwise specified), and two polarizing filters (hereinafter referred to as' top film' and ' If foreign matter is introduced between the lower film, or between the upper glass and the lower glass, it may cause a defect or AS, and thus, the foreign material may be checked during the manufacturing process.

Hereinafter, a foreign material inspection according to the prior art will be described with reference to FIGS. 1 and 2.

Figure 1 is a side view of the foreign matter inspection apparatus according to the prior art, Figure 2 is a detailed cross-sectional view of the portion A of FIG.

As shown, the foreign matter inspection apparatus according to the prior art is located in a part of the inspection facility 10 for comprehensively inspecting the operation of the LCD panel and the like.

The foreign matter inspection device is composed of two cameras 20 and 22 and an illumination 16. In addition, although not shown, a processor for checking a position where a foreign material is introduced is further included based on the images obtained from the two cameras 20 and 22.

The foreign material inspection apparatus according to the prior art uses the two cameras 20 and 22 while the LCD panel 30 positioned on the transfer plate 14 by the transfer roller 12 passes over the illumination 16. Photograph the panel 30.

As shown in FIG. 2, when the angle of view of the first camera is referred to as 'a' and the angle of view of the second camera is referred to as 'b', foreign substances a1 to c3 introduced into the respective parts are shown in the following table. Are identified as:

Item a1 a2 a3 b1 b2 b3 c1 c2 c3 First camera center slander Top Medium center slander lower Medium center Second camera Top slander center slander center Medium center Medium lower

Therefore, if the lower end is '1', the middle and lower end is '2', the middle is '3', the middle injury is '4', and the upper end is assigned a value of '5'.

Item a1 a2 a3 b1 b2 b3 c1 c2 c3 First camera 3 4 5 2 3 4 One 2 3 Second camera 5 4 3 4 3 2 3 2 One Sum 8 8 8 6 6 6 4 4 4

As shown in Table 2, the foreign matters located between the upper film 32 and the upper glass 34 have a total value of 8, and the foreign matters located between the upper glass 34 and the lower glass 36 add up. The value is 6, and the foreign materials located between the lower glass 36 and the lower film 38 have a total value of 4.

In this way, since it is possible to confirm which layer the foreign matter is located between, the manufacturing side can perform the necessary rework based on the total value of Table 2.

However, such a prior art uses two cameras, resulting in an increase in cost.

In addition, the inspection takes a lot of time because the two cameras are loaded by the processing device to perform the discriminating operation.

On the other hand, the size of the LCD panel to be inspected is increasing because the multimedia environment demands the supply of large LCD panels.

Therefore, in view of the transfer time of the transfer plate 14 of the inspection facility 10, two or more sets of inspection apparatuses are required to inspect a large LCD panel, and the installation location of the camera and the number of cameras used are increased. Increasing costs and the problem of either increasing the speed of the processing unit or having more than one processing unit have to be used.

The present invention is derived to solve the problems according to the prior art described above, and an object of the present invention is to provide an inspection apparatus capable of identifying a layer in which foreign matter exists using only one camera.

In order to achieve the above object, the foreign matter inspection apparatus of the LCD panel according to the embodiment of the present invention, in the inspection equipment for inspecting the LCD panel, between the upper glass and the lower glass constituting the LCD panel, between the upper glass and the upper film And a part of inspecting whether a foreign material exists between the lower glass and the lower film, the camera being disposed on an upper portion perpendicular to the LCD panel. It is installed on both sides of the camera divided into three angles of view, two reflectors for inducing to cross the center angle of view of the three divided angles of view and the lower than the position where the LCD panel passes through the shooting of the camera It characterized in that it comprises an illumination for supplying the required amount of light.

Here, one of the two reflectors described above is installed at an angle of 62.5 ~ 72.5 ° with respect to the LCD panel, the other is preferably installed at an angle of 107.5 ~ 117.5 °.

In the following, embodiments of the present invention are described with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the terms to be described later are terms set in consideration of functions in the present invention, and these terms may vary according to the intention or custom of the producer producing the product, and the definition of the terms should be made based on the contents throughout the present specification. .

(Installation of inspection equipment)

First, the installation of the foreign matter inspection apparatus of the LCD panel according to the embodiment of the present invention will be described with reference to FIG. 3.

Figure 3 is a side view of the foreign matter inspection apparatus according to an embodiment of the present invention.

As shown in FIG. 3, the foreign matter inspection apparatus (hereinafter, simply referred to as an “inspection apparatus” unless otherwise described) of the LCD panel according to the embodiment of the present invention is a top portion of the inspection facility 100. One camera 110 is installed at the bottom, the lighting 116 is installed at the bottom, and the reflective mirrors 120 and 130 are installed at a slightly upper portion of the position where the LCD panel 30 passes.

Camera 110 captures LCD panel 30 passing over illumination 116.

The lighting 116 is positioned at a position lower than the height at which the LCD panel 30 passes, and supplies the amount of light required for capturing the camera 110.

Reflectors 120 and 130 are installed at both sides of the camera's angle of view divided into three, and induces to pass through the center angle of view of the three divided angles of view. Here, the installation angles of the reflecting mirrors 120 and 130 are installed at the second reflecting mirror 130 at an inclination of 62.5 to 72.5 degrees, preferably 67.5 degrees. The first reflecting mirror 120 is installed at a slope of 107.5 ~ 117.5 °, preferably 112.5 °.

Hereinafter, an installation angle of the camera and the reflector will be described with reference to FIG. 4.

4 is a view for explaining the state of use of the foreign matter inspection apparatus according to an embodiment of the present invention.

Before description, in FIG. 4, the distance between the camera 110 and the reflectors 120 and 130 is small for convenience of description.

The camera 110 is located vertically upward with respect to the LCD panel 30. In the camera 110, about six cameras 110 may be arranged in a line according to the width of the LCD panel 30.

The reflecting mirrors 120 and 130 are installed to be inclined at a predetermined angle at a position that divides the angle of view c of the camera 110 into three parts. Here, the installation angles of the reflectors 120 and 130 may be angles at which the third angle of view overlaps the center angle of view and the LCD panel 30.

(Operation example)

Hereinafter, with reference to the accompanying drawings Figure 5 will be described an operation example of the inspection apparatus according to an embodiment of the present invention.

5 is a detailed cross-sectional view of the portion B of FIG.

As shown in FIG. 5, the angle of view c of the camera 110 is the center angle of view u directly facing the LCD panel 30, the left angle of view 1 reflected by the first reflector 120, and the second angle of view. It is divided into the right angle of view r reflected by the reflector 130 and passes through the LCD panel 30, respectively.

As a result, the range photographed at one time by the camera 110 becomes the center angle of view c.

Foreign substances introduced between the upper film 32 and the upper glass 34 are referred to as a1 to a3, foreign substances introduced between the upper glass 34 and the lower glass 36 are referred to as b1 to b3 and the lower glass 36 ) And the foreign material introduced between the lower film 38 is c1 to c3, the locations of the foreign materials photographed by the camera 110 are shown in Table 3 below.

Item a1 a2 a3 b1 b2 b3 c1 c2 c3 l l3 l2 l1 l4 l3 l2 l5 l4 l3 r r1 r2 r3 r2 r3 r4 r3 r4 r5 u u1 u2 u3 u1 u2 u3 u1 u2 u3

Here, if the number after the alphabet is recognized as a number by a processing device (not shown), a result as shown in Table 4 below is obtained.

Item a1 a2 a3 b1 b2 b3 c1 c2 c3 l 3 2 One 4 3 2 5 4 3 r One 2 3 2 3 4 3 4 5 u One 2 3 One 2 3 One 2 3 l + r 4 4 4 6 6 6 8 8 8 l + r + u 5 6 7 7 8 9 9 10 11

As shown in Table 4, the foreign materials a1 to a3 introduced between the upper film 32 and the upper glass 34 have an l + r value of '4', and the upper glass 34 and the lower glass ( The foreign matters b1 to b3 introduced between 36) have a l + r value of '6', and the foreign matters c1 to c3 introduced between the lower glass 36 and the lower film 38 have a l + r value. Is '8'.

The value of l + r + u can be used to identify the position of foreign matter on the same plane.

On the other hand, when the image photographed through any one of the first reflector 120 or the second reflector 130 is not clear, the layer in which the foreign matter is introduced by using the l + u or r + u value is used. You can check it.

The embodiments of the present invention have been described above with reference to the accompanying drawings. However, it is to be noted that the present invention is not particularly limited only to the above-described embodiments, and that various modifications and changes can be made by those skilled in the art within the spirit and spirit of the appended claims as necessary.

As described above, according to the present invention, it is possible to provide an inspection apparatus capable of confirming a layer into which a foreign substance of an LCD panel is introduced using only one camera.

In addition, according to the present invention, by analyzing only the image photographed by one camera, it is possible to check the layer into which the foreign matter is introduced, thereby providing an inspection apparatus having a high processing speed.

Claims (2)

In the inspection equipment for inspecting the LCD panel, in the part for inspecting the presence of foreign matter between the upper glass and the lower glass, the upper glass and the upper film and the lower glass and the lower film constituting the LCD panel, A camera installed at an upper portion perpendicular to the LCD panel; Two reflecting mirrors installed at both sides of the camera's angle of view for dividing the angle of view into three, and leading to cross the center angle of view of the three divided angles of view; And The foreign matter inspection apparatus of the LCD panel, characterized in that it is installed at a lower position than the position where the LCD panel passes, the illumination to supply the amount of light required for the camera shooting. The apparatus of claim 1, wherein one of the two reflectors is installed at an angle of 62.5 to 72.5 ° with respect to the LCD panel, and the other is installed at an angle of 107.5 to 117.5 °.

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