JPH0248092B2 - EKISHOHYOJISOSHINOSEIZOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a liquid crystal display element having two liquid crystal layers, upper and lower.

[Conventional technology]

A liquid crystal display element having two upper and lower liquid crystal layers is constructed by sealing an upper substrate 3, an intermediate substrate 4, and a lower substrate 5, each of which has a transparent electrode 1 and an alignment film 2 on their facing surfaces, as shown in FIG. 2, for example. At the same time, the transparent electrodes 1 of each substrate 3, 4, and 5 are electrically connected by a conductive adhesive 8 formed by printing, and a liquid crystal 9 is sealed inside. It consists of:

In the manufacturing process of such a liquid crystal display element, a conductive adhesive 8 is applied to the shaded area 10 at the position shown in FIG. 3 when viewed from above each substrate 3, 4, 5.
To print, (1) make small holes 11 as shown in Figure 4;
A method of printing on each upper surface of the intermediate substrate 4 and the lower substrate 5 in an upright state using a screen 11 having a screen 11,
(2) A method of printing upside down on the lower surfaces of the upper substrate 3 and the intermediate substrate 4 using a screen 12 having small holes 12a as shown in FIG. Two types of screens 11 and 1 as shown
2 is used to print on the lower surface of the upper substrate 3 upside down and on the upper surface of the lower substrate 5 in the upright position.

[Problem that the invention seeks to solve]

However, in the methods (1) and (2) above, the intermediate substrate 4
When printing, there was a problem in that the surface opposite to the surface to be printed touched the stage of the printing press, damaging the alignment film 2. Furthermore, the above method (3) requires two types of screens 11 and 12, which has the problem of increasing costs and complicating the process.

In view of the above-mentioned problems, the present invention aims to provide a method for manufacturing a liquid crystal display element that is free from damage to the alignment film of the intermediate substrate, is inexpensive, and has simple steps.

[Means and actions for solving problems]

The method for manufacturing a liquid crystal display element according to the present invention uses one type of screen in which a plurality of small holes are provided laterally or vertically symmetrically and one printing machine, and the lower surface of the upper substrate is printed upside down. A conductive adhesive is printed on the upper surface of each substrate in an upright position, and the upper, middle, and lower substrates, each of which has a transparent electrode on their facing surfaces, are stacked in an upright position, and the conductive adhesive is printed. However, by making sure that the transparent electrode is not present on at least one of the two substrates connected via the conductive adhesive, there is no printing on the intermediate substrate. This eliminates the need to use a single screen.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIG. 1 and the above-mentioned FIGS. 2 and 3. FIG. 1 shows a screen used in the method of the present invention, and this screen 13 has a plurality of small A hole 13a is provided. In the manufacturing process of the liquid crystal display layer as shown in FIG. 2, in order to electrically connect the transparent electrodes 1 of each substrate 3, 4, and 5 via the conductive adhesive 8, the method shown in FIG. In order to print the conductive adhesive 8 on the shaded area 10 at such a position, use this screen 13 to print the conductive adhesive 8 on the lower surface of the upper substrate 3.
A conductive adhesive 8 is printed on the upper surface of the lower substrate 5 while the substrate is turned upside down. After printing, if the upper substrate 3, intermediate substrate 4, and lower substrate 5 are placed one on top of the other in a normal position, the transparent electrodes 1 of each substrate 3, 4, and 5 are brought into conduction. However, in this case, the conductive adhesive 8 is printed in areas other than the shaded area 10 in FIG. The condition that the transparent electrode 1 is not present is required.

In this way, a liquid crystal display element is manufactured. According to the manufacturing method of the present invention, since the conductive adhesive 8 can be easily printed on the upper substrate 3 and the lower substrate 5 using one type of screen 13, printing on the intermediate substrate 4 is possible. As a result, the central substrate 4 is sent to the next process without passing through the printing process, so there is no fear of damaging the alignment film 2. Also, one type of screen 13 can be used to cover the upper substrate 3.
and the lower substrate 5, the cost of the screen is about half that of the case where two types of screens are used, making it cheaper. Further, for the same reason, there is no need to use two types of screens as in the conventional method, and printing can be performed continuously on the upper substrate 3 and the lower substrate 5 with one printing machine, which simplifies the process.

In the above example, the horizontally symmetrical screen 13 is used, but it goes without saying that a vertically symmetrical screen may be used instead.

〔Effect of the invention〕

As described above, according to the method for manufacturing a liquid crystal display element according to the present invention, when the transparent electrodes of each substrate are electrically connected via a conductive adhesive, there is no fear of damaging the alignment film of the intermediate substrate, and the cost is reduced. It also has the practically important effect of simplifying the process.

[Brief explanation of drawings]

Fig. 1 is a plan view of a screen used in the method of the present invention, Fig. 2 is a cross-sectional view of a liquid crystal display element, Fig. 3 is a plan view showing areas where conductive adhesive is to be printed, and Figs. 4 and 5 are 1A and 1B each show a plan view of a screen used in the conventional method; DESCRIPTION OF SYMBOLS 1... Transparent electrode, 2... Alignment film, 3... Upper substrate, 4... Intermediate substrate, 5... Lower substrate, 6... Seal material, 7... Gap control material, 8... Conductive adhesive Agent, 9...Liquid crystal, 13...Screen.

Claims (1)

[Claims] 1. In a method for manufacturing a liquid crystal display element having two upper and lower liquid crystal layers, one type of screen in which a plurality of small holes are provided horizontally or vertically symmetrically and one printing machine are used to form a liquid crystal display device on the lower surface of an upper substrate. is upside down, conductive adhesive is printed on the upper surface of the lower substrate in the upright position, and the upper, middle, and lower substrates with transparent electrodes provided on the surfaces facing each other are stacked in the upright position. The transparent electrode is not present on at least one of the two substrates connected via the conductive adhesive in a place where the conductive adhesive is printed but does not require conduction. A method for manufacturing a liquid crystal display element.