JPS6167823A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE:To adhere two electrode substrates uniformly and to seal them efficiently by adhering the two substrates to one of which a sealing agent is applied successively from one direction while pressing them by rollers. CONSTITUTION:The lower electrode substrate 1b to which the sealing agent 2 has been previously applied is superposed to the upper electrode substrate 1a at their leading end parts, the leading end part are inserted into a gap between press rollers 3, and while discharging air existing between the substrate 1b and the sealing agent 2, both the substrates 1a, 1b are pressed and adhered successively. In the succeeding adhering process, these substrates 1a, 1b are pressed by a pair of pressing plates 4 from the upper and lower directions and the adhesion is completed by hardening the sealing agent. Thus, both the electrode substrates can be uniformly adhered and efficiently sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a liquid crystal display element comprising a flexible electrode substrate.

(Prior Art) Liquid crystal display elements that are currently in widespread use are formed by forming an alignment film on the inner surfaces of a pair of electrode substrates, each consisting of a transparent conductive film provided on the inner surface of a glass plate, and sealing the edges of these electrode substrates. The liquid crystal is injected between the two electrode substrates, which are bonded together by printing and applying a liquid crystal.

Incidentally, in recent years, liquid crystal display elements have become increasingly lighter, smaller, and thinner, but liquid crystal display elements that use glass for the electrode substrate as described above naturally have problems due to mechanical strength and manufacturing constraints. There are limitations and it is not possible to adequately respond to such trends. Glass also has the disadvantage that it has poor impact resistance, so there is a risk of breakage.

Therefore, as an alternative to glass, a liquid crystal display element using plasti or 7-layer film as an electrode substrate has been proposed.

(Problems to be Solved by the Invention) However, since plastic films have flexibility, problems that do not occur in the case of glass occur in the step of bonding the electrode substrates and the subsequent bonding step. That is, in the case of glass, since the electrode substrates do not deform and have a smooth surface, two electrode substrates can be bonded together simultaneously and uniformly, and the occurrence of sealing defects is extremely small. However, in the case of a plastic film, the electrode substrates a are easily bent and it is difficult to maintain the entire electrode substrate a in a uniformly smooth state during bonding.

A could not be bonded together at the same time and uniformly.

As shown in FIG. 3, the bonding becomes only partial. For this reason, the part C where bonding is not performed
Air is introduced into ... during the first bonding process.

As shown in Fig. 4, there is also a problem that air bubbles are formed in the sealing part. After the bonding process is finished, parts of the bonded parts may float, and when this happens, air gets trapped in the lifted areas, causing air bubbles to form in the seal during the bonding process. There is. especially.

When a thermosetting resin is used as a sealant.

These bubbles d... expand, causing problems such as deterioration of the seal shape and poor sealing performance.

(Means for Solving the Problems) The method for manufacturing a liquid crystal display element of the present invention includes applying a sealant to one of two electrode substrates and bonding both electrode substrates together.
These electrode substrates are successively pasted together from one direction while being pressed by a roller.

(Function) The roller presses the two electrode substrates sequentially from the end backwards, and also presses the two electrode substrates together while expelling the air between one of the electrode substrates and the sealant.

(Example 1) This example will be explained with reference to FIG.

First, two electrode substrates 1a made of plastic film are
, lb, the lower electrode substrate 1'b is preliminarily coated with sealant 2.
After printing and coating, both the upper and lower electrode substrates 1a.

The tips of the rollers 1b are overlapped and fed between the two rollers 3a and 3b of the roller pressure section 3. At this time.

The upper electrode substrate 1a is supplied obliquely from above so that the upper electrode substrate 1a does not accidentally stick to the lower electrode substrate 1a.

Two rollers 3a constitute the roller pressure section 3.

3b has a width equal to or longer than the width of both electrode substrates 1a and lbO, and is arranged above and below at a predetermined interval. ! They are rotated in opposite directions by an appropriate driving means (not shown) as indicated by arrows A in the figure. Moreover, these rollers 3a.

3b are pressed in directions facing each other by appropriate pressure means (not shown), and the pressure is such that the adhesive strength of the sealant and the electrode substrate 1a will not peel off naturally after bonding. 2 is designed to be effective.

Then, both the electrode substrates 1a and lb are wound up by the rollers 3a and 3b and sent forward. At this time, both electrode substrates 1a and lb are sequentially pressed from their ends by rollers 3a and 3b, and the upper electrode substrate 1b
The air between the sealant 2 and the sealant 2 is expelled to the outside as they are bonded together.

Both electrode groups i1a are bonded together in this way.

1b is sent to the next bonding process, where both electrode substrates la,
lb is a pair of press plates 4a with smooth surfaces.

4b pressurizes from above and below to harden the sealant 2. This completes the bonding of both electrode substrates 1a and lb.

The press plates 4a and 4b are made of, for example, a steel plate or a glass plate.

In addition, although the sealant 2 is applied to the lower electrode substrate lb side in the above, it may be applied to the upper electrode substrate la side.

(Example 2) This example will be explained with reference to FIG.

In this example, one roller 3C connects both electrode substrates 1a.

1b, and a substrate fixing table 5 is used in place of the lower roller 3b in the first embodiment.

The board fixing table 5 has a smooth upper surface, and a plurality of suction holes 6 are provided on that surface. omission)
and is evacuated by the suction means.

Place the rail agent 2 on the board fixing table 5 in advance.
The electrode substrate 1b printed and coated with is placed thereon.

When the suction holes 6 are evacuated, the electrode substrate 1b is pulled by the suction holes 6 and fixed onto the substrate fixing table 5.

Next, one end of both the upper and lower electrode substrates 1a and Ib are overlapped, and pressure is sequentially applied from the overlapped part to the other end while rotating the roller 3C in the direction shown by arrow B (. Substrate 1a.

The bonding of 1b is completed.

Subsequently, the bonded electrode substrates 1a and lb are sent to the bonding process described in Example 1 above and are completely bonded.

(Effects of the Invention) According to the present invention, the nine electrode substrates can be bonded uniformly, and air does not enter between the electrode substrate and the sealant, so air bubbles are not formed in the sealing part. Good sealing performance can be obtained without any problems.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the method for manufacturing a liquid crystal display element according to the present invention. FIG. 2 is a schematic diagram showing another embodiment of the present invention. FIGS. 3 and 4 are diagrams showing conventional problems. point, the third
The figure is a side view showing a defective bonding of both electrode substrates, and FIG. 4 is a side view showing a state in which bubbles are formed in the sealant. la, Ib... electrode substrate, 2... sealant 3 a,
3 b, 3 c---o-ra and 1 other figure 7 figure 2 figure 3 figure 4

Claims (1)

[Claims] 1) A method for manufacturing a liquid crystal display element in which a liquid crystal is sealed between two flexible electrode substrates, which comprises: applying a sealant to one of the two electrode substrates; A method for manufacturing a liquid crystal display element, characterized in that when bonding these electrode substrates together, the electrode substrates are bonded one after another from one direction while being pressed by a roller.