JPS6251450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device, and particularly to a method for aligning a liquid crystal display device using a dot matrix type liquid crystal panel as a display plate.

Dot matrix type liquid crystal display devices generally include a glass substrate on which parallel band-shaped transparent electrodes are formed in the X direction,
Glass substrates with parallel band-shaped transparent electrodes formed in the Y direction are arranged facing each other with a slight gap between them, a liquid crystal is sealed between the two glass substrates, and the two glass substrates are printed with drive circuits, etc. It has a structure in which it is connected and fixed onto a board via a conductive rubber connector or the like.

In the manufacture of such liquid crystal display devices, accurate alignment between two glass substrates on which transparent electrodes are formed and between the aligned display panel and printed board are important steps. .

Traditionally, this positioning was done by preparing a positioning jig or the like and using the naked eye or a microscope by an operator, but recently the number of characters displayed on LCD panels has increased and electrode dimensions and electrode pitches have become smaller. As a result, conventional alignment methods have the problem of increasing alignment work time and increasing alignment errors.

The purpose of the present invention is to provide a novel positioning method that solves the above-mentioned problems, and for this reason, the present invention is directed to a method for positioning between two flat transparent substrates each having a transparent conductive film electrode formed thereon. In a liquid crystal display device in which a liquid crystal is sealed and the transparent substrate is connected and fixed on a printed circuit board, a conductive alignment pattern is provided on the flat transparent substrate and the printed circuit board, and the overlap of the alignment pattern is electrically connected. The gist of the present invention is a method for aligning a liquid crystal display device, which is characterized in that alignment is performed between the two planar transparent substrates and/or between the planar transparent substrate and the printed circuit board by inspecting continuity.

Next, details of the present invention will be explained with reference to the drawings.

FIG. 1 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a plan view of a Y electrode substrate.
FIG. 3 is a plan view of the X electrode substrate, FIG. 4 is a plan view of the printed circuit board, and FIG. 5 is a plan view of the X electrode substrate, Y electrode substrate, and printed circuit board superimposed.

The liquid crystal display device of the present invention has a configuration as shown in FIG. That is, the metal electrode terminals 2 on the printed circuit board 1 are electrically connected to the transparent conductive film on the upper glass substrate (Y electrode substrate) 4 of the liquid crystal panel via the conductive rubber connector 3. A liquid crystal panel lower glass substrate (X electrode substrate) 6 is bonded to an upper glass substrate 4 with a sealant 5, and a gap 7 is filled with liquid crystal. Terminals 4 are led out from the transparent conductive film on the lower glass substrate 6 to the upper glass substrate 4 via a conductive paste. 8 is a cover, adhesive tape 9 and conductive rubber connector 3
The liquid crystal panels 4 and 6 are fixed onto the printed board 1 by applying pressure.

On the Y electrode substrate 4, as shown in FIG. 2, a Y electrode 11, an electrode terminal 16, and an electrode terminal for inspection 13 are formed, and on the X electrode substrate 6, as shown in FIG. An electrode 17 is formed.

The Y electrode board 4 and the and test electrode 1
7-2 is connected to inspection electrodes 13-3 and 13-4. This display panel is further superimposed and fixed on the printed circuit board 1 as shown in FIG.

Here, the ends of the Y electrode 11, the electrode terminal 16, and the end of the test electrode terminal 13 of the Y electrode board 4 are connected to the metal terminal 2, metal terminal 19, and metal terminal on the printed circuit board 1 by conductive rubber connectors 3, respectively. 15
connected to.

In order to inspect whether or not the alignment has been performed accurately during manufacturing and assembly of the liquid crystal display device as described above, it is necessary to It is sufficient to check the electrical continuity between the metal terminal 15-4 and the metal terminal 15-4.

That is, when the metal terminal 15-1 is pressed, it is connected to the test terminal 13-1 of the Y electrode board 4 through the conductive rubber 3, which conducts in a specific direction, and the test electrode 17-1 of the X electrode board 6. 1 for inspection through 13-2
The inspection terminal 13-2 is further connected to the metal terminal 15- of the printed circuit board 1 via the conductive rubber 3.
2 is connected.

By similarly confirming continuity between the metal terminals 15-3 and 15-4, accurate alignment between the respective boards can be inspected. Note that by forming the widths of the alignment inspection electrodes and terminals to be smaller than the widths of the display electrodes and terminals, even minute positional deviations can be detected and alignment becomes more accurate.

As explained above, according to the alignment method of the present invention, the continuity between the two test terminals of the printed circuit board can be checked by, for example, lighting a lamp, so there is an advantage that the alignment work efficiency can be greatly improved. .

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a plan view of the Y electrode substrate, FIG. 3 is a plan view of the X electrode substrate, and FIG. 4 is a plan view of the printed circuit board. Figure 5 shows the X electrode substrate,
A plan view in which the Y electrode substrate and the printed circuit board are superimposed is shown. In the figure, 1 is a printed circuit board, 2 is a metal electrode terminal, 3 is a conductive rubber, 4 is a Y electrode board, 5 is a sealing material, 6 is an X electrode board, 7 is a liquid crystal, 8 is a case, 9 is an adhesive tape, 10 is an X electrode, 11 is a Y electrode, 13 is a terminal for inspection, 15 is a metal terminal for inspection,
Reference numeral 16 indicates an electrode terminal, 17 indicates an electrode for inspection, and 18 indicates a metal terminal.

Claims (1)

[Claims] 1. In a liquid crystal display device in which a liquid crystal is sealed between two flat transparent substrates each having a transparent conductive film electrode formed thereon, and the transparent substrates are connected and fixed on a printed circuit board, the two flat transparent substrates and the printed circuit board are A conductive alignment pattern is provided on the printed board, and a closed circuit is formed from one terminal of the printed board through the two flat transparent substrates to the other terminal of the printed board. 1. A method for aligning a liquid crystal display device, comprising inspecting overlapping patterns by electrical continuity to align the two planar transparent substrates and between the planar transparent substrate and the printed circuit board.