JPS62297034A - Position aligning method - Google Patents

Abstract

PURPOSE:To make it possible to align positions of a 1st and a 2nd objects by forming electricity conductive marks on the opposite surfaces of the 1st and 2nd objects thereby detecting presence or absence of electrical conductance between said electricity conductive marks of the 1st and 2nd objects. CONSTITUTION:Aligning marks 13 and 15 on a liquid crystal display cell 11 extend toward the ends of the liquid crystal display cell 11 to form aligning mark electrodes 14 and 16. Both of the aligning marks 13 and 15 and the aligning mark electrodes 14 and 16 can be formed at the time of transparent patterning of signal scanning electrodes of the liquid crystal display cell 11. Aligning marks 23 and 25 on a printed circuit board 21 similarly extend toward the ends of the print circuit board 21 to form aligning mark electrodes 24 and 26. The aligning mark electrodes 14, 16, 24 and 26 are connected to respective conductance checkers so that aligning is performed by detecting presence or absence of electrical conductivity between the aligning marks 13 and 23 and between 15 and 25.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention The present invention provides a method for mounting two objects, particularly a panel-shaped Concerning how to align the body.

A liquid crystal display device includes a liquid crystal display cell and a circuit board such as a printed circuit board that drives the cell. Signal line lead electrodes and scanning line lead electrodes are formed on the liquid crystal display cell, and electrodes are also formed on the drive circuit board in the same pitch pattern. A liquid crystal display device is a liquid crystal display cell! After aligning the opposing electrodes with the drive circuit board, electrical continuity is established using an anisotropically conductive connector such as a zebra connector or a heat seal connector.

As a positioning method for alignment.

■Method based on the outer edge of the cell.

■Pin alignment method (which aligns the position by inserting a pin into the hole drilled at the end of the cell)
(Japanese Patent Application No. 108240/1982), (2) A method of optically aligning the respective alignment marks provided on the cells, and the like are known.

However, although the above method (■) is inexpensive, the precision of the outer edge is insufficient, so it is not suitable for liquid crystal display cells with high pattern precision like today, especially for liquid crystal display cells using plastic film substrates. Cell (PF-LCD)
This is a big problem because it is flexible.

Method (2) can be applied to PF-LCDs and can be manufactured at low cost, but is not suitable for those requiring highly accurate alignment.

The optical method (2) is effective for alignment of liquid crystal display cells having high-precision patterns, but requires an optical system and an analysis device, which increases the size of the device and requires expensive equipment.

The present invention provides a positioning method that allows easy and highly accurate alignment using a relatively simple device.

The alignment method of the present invention is a method of superimposing and aligning a first object and a second object.
forming first and second conductive matching marks on opposing surfaces of the object, respectively, and performing alignment by detecting the presence or absence of electrical continuity between the first and second conductive matching marks. Features.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a diagram for explaining the method of the present invention, and shows a case where a printed circuit board 21 and a liquid crystal display cell 11 are aligned. Since the positions of two or more match marks can be determined by placing them face down, two match marks 13.15 and 23.25 are provided at separate locations.

The dot marks 13.15 of the liquid crystal display cell 11 extend directly toward the ends of the liquid crystal display cell to form the dot mark electrodes 14.15.
16 is formed. The matching mark 13.15 and the matching mark electrode 14.16 can be formed during transparent electrode patterning of the signal scanning electrode of the liquid crystal display cell 11. I
The TO is thin, about 300 pieces, and is difficult to contact with the dowel mark 23.25 on the printed circuit board 21. Also, it is easily scratched by rubbing against the surface of the printed circuit board, increasing the contact resistance. It is desirable to form the match mark using a thicker and stronger conductive material, such as by coating it.

The dowel marks 23.25 of the printed circuit board 21 likewise extend directly to the ends of the printed circuit board 21 to form dowel mark electrodes 24.26. The matching marks 23, 25 and the matching mark electrodes 24, 26 may be made of any conductive material such as solder plating or conductive paste.
i When creating signal electrodes and scanning electrodes by flash plating Au on the base, if mask patterns for creating matching marks and matching mark electrodes are created at the same time, the signals that need to be aligned can be created at the same time. Misalignment between the electrodes and the scanning electrodes can be reduced.

The match mark electrodes 14, 16, 24, and 26 are each connected to a continuity checker 31, and alignment is performed by detecting the presence or absence of electrical continuity between the match marks 13°, 23, and 15, 25.

FIGS. 2A-2C are explanatory diagrams showing the details.

First, rough alignment is performed so that the alignment marks 15 and 25 overlap visually (FIG. 2A). Next, move one side in the Y direction (vertical direction) and stop when it becomes non-conductive (Figure 2B). Next, move it in the X direction and stop when it becomes non-conductive.

By repeating this movement operation in the X direction and the Y direction, the alignment is completed. Width Q of match mark 15.25
Y and 0□ are appropriately determined depending on the required alignment accuracy.

FIGS. 3A and 3B are diagrams showing cases in which other matching marks are used. First, a rough alignment is determined by visual inspection (FIG. 3A), and then the alignment is completed with a non-energized state.

The sizes of φ□ and φ29 Ll Ω differ depending on the accuracy of alignment.

FIG. 4 is a diagram showing another example of alignment marks, in which alignment is completed in this non-conducting state.

The dimensions of the alignment marks 13.23 vary depending on the required alignment accuracy.

According to the positioning method of the present invention, alignment can be performed simply and with high precision using a small device.

Note that although the above description has focused on alignment between the liquid crystal display cell and the drive circuit board, the present invention can be similarly applied to other alignments.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the method of the present invention. Figures 2A, 2B, 2C, and 3A. FIGS. 3B and 4 are diagrams showing the alignment mark shape and alignment state. 11...Liquid crystal display cell 13.15...Match mark 21...Printed circuit board 23.25...Match mark 31...Continuity checker Fig. 1

Claims (1)

[Claims] 1. In a method of overlapping a first object and a second object to align the two objects, first and second conductive matching marks are formed on opposing surfaces of the first object and the second object, respectively. . An alignment method, comprising aligning the first and second objects by detecting the presence or absence of electrical continuity between the first and second conductive alignment marks.