JPH0412542Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to an inspection device for inspecting pixel defects, brightness unevenness, crosstalk, etc. of a liquid crystal display panel.

(Prior Art) Generally, in the manufacturing process of a liquid crystal display panel, there is an inspection process for inspecting the presence or absence of pixel defects, brightness unevenness, crosstalk, etc., which greatly affect performance.

The inspection equipment used in the inspection process is as follows:
Conventionally, a structure as shown in FIG. 4 has been used. In other words, the bolts 3 are attached to the four outer corners of the frame-shaped inspection pattern 2 formed on the drive board 1.
While standing upright, a liquid crystal display panel 5 is bonded onto the pattern 2 via an anisotropic conductive mat 4.
A presser frame 7 is joined to this liquid crystal display panel 5, and a wing nut 8 screws the presser frame 7 onto the bolt 3.
The pattern of the liquid crystal display panel 5 is brought into electrical contact with the pattern 2 of the drive board 1 by tightening the pattern. Then, the liquid crystal display panel 5 is illuminated with the light source 9 disposed on the lower surface side of the drive board 1 while electricity is applied to the pattern 2 of the drive board 1, and it is determined whether or not there are various defects in the liquid crystal display panel 5. I'm trying to get it checked.

However, according to such inspection equipment,
Since the liquid crystal display panel 5 is tightened and fixed by the four wing nuts 8, it is difficult to make the tightening pressure uniform. Therefore, the pattern between the liquid crystal display panel 5 and the drive board 1 sometimes caused poor contact. Further, since many wing nuts 8 had to be tightened by hand, the workability was very poor.

(Problem to be solved by the invention) This invention was developed based on the above circumstances, and its purpose is to hold and fix the liquid crystal display panel to the drive board with uniform pressure. An object of the present invention is to provide a liquid crystal display panel inspection device that can be used to inspect a liquid crystal display panel.

[Structure of the invention] (Means and effects for solving the problems) In order to solve the above problems, this invention includes a drive board and an anisotropic conductive mat that is positioned and installed on the top surface of the drive board. a liquid crystal display panel, a light source disposed on the lower surface side of the drive board for illuminating the liquid crystal display panel, and a material disposed between the light source and the drive board through which illumination light from the light source can pass. and a holder for vacuum suctioning the liquid crystal display panel. The liquid crystal display panel can be held and fixed with uniform pressure by vacuum suction.

(Embodiment) An embodiment of this invention will be described below with reference to FIGS. 1 and 2. The inspection device shown in FIG. 1 includes a drive board 11. The test device shown in FIG. This drive board 1
A rectangular frame-shaped test pattern 12 is formed at the center of the upper surface of the tester 1 . A through hole 13 is bored in a portion of the drive board 11 within this pattern 12. A liquid crystal display panel 15 is installed on the upper surface of this drive board 11 via an anisotropic conductive mat 14, and then held and fixed by vacuum suction as described later. When installing the liquid crystal display panel 15 on the drive board 11, the liquid crystal display panel 15 is positioned by four positioning bodies 16 arranged corresponding to each side of the pattern 12. That is, the positioning body 16 consists of an arm 17 and an abutment piece 18 attached to the tip of the arm 17. and,
By bringing the outer circumferential surfaces of the anisotropic conductive mat 14 and the liquid crystal display panel 15 into contact with the side surfaces of these four contact pieces 18, these four contact pieces 18 are connected to the pattern 12.
It is possible to position against. Note that two of the four positioning bodies 16 have contact pieces 18 attached to the arm 17 by leaf springs 19, so that they can be displaced upward as shown by arrows in FIG. ing.

A holder 21 is disposed in a bonded state on the lower surface of the drive board 11 at a position facing the through hole 13 . The holder 21 is made of a transparent material that transmits light, and a large number of suction holes 22 are opened on the upper surface of the holder 21 and are evenly spaced relative to the through holes 13. These suction holes 22
communicates with a pipe 24 provided on one end surface of the holder 21 via a communication path 23 formed in the holder 21. This pipe 24 communicates with a vacuum pump (not shown). Therefore, the suction force generated by this vacuum pump acts on the suction hole 22 of the holder 21, so that the liquid crystal display panel 15 is attracted to the upper surface of the holder 21 via the anisotropic conductive mat 14. It is becoming more and more common.

Further, a light source 26 for illumination is provided on the lower surface side of the holder 21 via a light shielding mask 25. A through hole 27 is formed in the light shielding mask 25 at a portion corresponding to the holder 21 . Therefore, the illumination light from the light source 26 is transmitted through the light shielding mask 2.
5, the light passes through the holder 21 and illuminates the liquid crystal display panel 15.

In an inspection device with such a structure, first of all, four
An anisotropic conductive mat 14 and a liquid crystal display panel 15 are placed in the area surrounded by the contact piece 18 of the book arm 17.
and sequentially. Then, these are positioned on the drive board 11 by the abutting piece 18. That is, the pattern (not shown) of the liquid crystal display panel 15 matches the pattern 12 of the drive board 11. Next, a vacuum pump (not shown) is activated. Then, a suction force is generated in the suction hole 22 of the holder 21, and the liquid crystal display panel 15 disposed on the drive board 11 is suctioned by the suction force. The suction holes 22 are formed in the holding body 21 in a uniformly distributed state. Therefore, a uniform suction force is applied to the liquid crystal display panel 15 according to the distribution of the suction holes 22, so that the liquid crystal display panel 15 can be held and fixed without causing contact failure.

After the liquid crystal display panel 15 is held and fixed in this manner, electricity is applied to the liquid crystal display panel 15 via the drive board 11, and the light source 26 is activated. Then, the illumination light from the light source 26 passes through the transparent holder 21 and illuminates the liquid crystal display panel 15, so depending on the state in which the illumination light passes through the liquid crystal display panel 15, pixel defects, uneven brightness, and cross-sectional areas may occur. It is possible to determine the presence or absence of defects such as talk. At this time, if the illumination light transmitted through the liquid crystal display panel 15 is detected by an inspection camera (not shown) instead of with the naked eye, it is possible to automatically determine the presence or absence of a defect.

Note that the inspection device according to this invention may have the structure shown in FIG. 3. That is, this embodiment differs in the means for positioning the liquid crystal display panel 15.
In other words, 31 in the figure is the main body of the device, and this main body 3
A drive board 11 is installed on a top plate 32 of 1. The liquid crystal display panel 15 disposed on the drive board 11 includes a pair of fixed positioning bodies 33,
It is positioned by a pair of movable positioning bodies 34.
The fixed positioning body 33 is arranged so that one side thereof is at a predetermined position, and the movable positioning body 34 is configured such that a movable piece 36 can be moved forward and backward by rotating a handle 35. Therefore, after the two sides of the liquid crystal display panel 15 are joined to the fixed positioning body 33 and installed, the movable piece 36 of the movable positioning body 34 is moved forward to be joined to the remaining two sides of the liquid crystal display panel 15. For example, this liquid crystal display panel 15 can be accurately positioned. Further, numeral 37 in the figure is an inspection camera that detects the illumination light transmitted through the liquid crystal display panel 15, and the presence or absence of defects in the liquid crystal display panel 15 is automatically determined by the illumination light detected by the inspection camera 37. I'm starting to be able to do it.

[Effects of the invention] As described above, this invention vacuum-adsorbs the liquid crystal display panel with a holder made of a material that can transmit illumination light and is placed on the lower side of the drive board. It is now held and fixed in place at the top. Therefore, it is possible to apply an even suction force to the entire liquid crystal display panel.
Unlike the conventional method in which the liquid crystal display panel is fixed on the drive board by mechanical tightening force, there is no possibility that the pressure acting on the liquid crystal display panel becomes uneven and causes poor contact. Furthermore, after placing the liquid crystal display panel on the drive board, the liquid crystal display panel can be held and fixed by simply generating suction force on the holding body, making this work quick and easy. has advantages.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of this invention, Fig. 2 is a perspective view thereof, Fig. 3 is a perspective view showing another embodiment of this invention, and Fig. 4 is an exploded perspective view showing a conventional structure. It is a diagram. DESCRIPTION OF SYMBOLS 11... Drive board, 14... Anisotropic conductive mat, 15... Liquid crystal display panel, 21... Holder, 26... Light source.

Claims (1)

[Scope of utility model registration request] a drive board, a liquid crystal display panel positioned and installed on the top surface of the drive board via an anisotropic conductive mat, a light source arranged on the bottom side of the drive board for illuminating the liquid crystal display panel, and this light source. and a holder disposed between the drive board and the holder, which is made of a material through which illumination light from the light source can pass through, and which holds the liquid crystal display panel under vacuum suction. inspection equipment.