JPH01213621A - Production of composed liquid crystal display - Google Patents

Abstract

PURPOSE:To reduce a feeling of visual disorder by pressing and joining respective end faces of plural substrates against/to each other with a bonding agent consisting of polymeric materials and radiating laser beams to the projected bonding agent to etch it so that a level difference between the projection and the surface of the substrate is <=5mum. CONSTITUTION:The bonding agent 6 consisting of polymeric materials is applied to the end faces of the circuit substrates to press the end faces of the substrates 1 against each other and preparatorily join them. In order to increase mechanical intensity, the rear face of the circuit substrate 1 may be joined with a base substrate. Laser beams 7 are radiated to the projected bonding agent 6 to etch the bonding agent 6 so that a level difference between the surface of the substrate 1 and the bonding agent 6 is <=5mum. The circuit substrate 1 and an opposite substrate 3 are sealed with a bonding agent 4 for sealing them with a proper gap and liquid crystal 2 is injected to the gap. Consequently, a non- display area can be reduced and a feeling of visual disorder can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a composite liquid crystal display that functions as one liquid crystal display by combining circuit boards of at least two liquid crystal displays.

[Conventional technology]

FIG. 2 is a sectional view showing a conventional composite liquid crystal display disclosed in, for example, Japanese Unexamined Patent Publication No. 62-124527. In the figure, (1) is the circuit board of the liquid crystal display, (2) is the liquid crystal, (3) is the counter board that faces the circuit board of the liquid crystal display with an appropriate gap, and (4) is the seal between the circuit board and the counter board. (5) is a thin plate that seals the end faces; (6) is an adhesive that joins the end faces. First, one liquid crystal display block is formed by a liquid crystal display circuit board (1), a liquid crystal (2), a counter substrate (3), a sealing adhesive (4), and a thin plate (5) for sealing the end face. Thereafter, a plurality of these liquid crystal display blocks are bonded together using an adhesive (6) for bonding the end faces to manufacture a composite liquid crystal display that functions as one liquid crystal display.

[Problem to be solved by the invention]

Since the conventional method for manufacturing a composite liquid crystal display is configured as described above, a non-display area exists between each liquid crystal display block, which may cause visual discomfort. Become. Furthermore, in the conventional example, the liquid crystal display block moves independently without being electrically connected, so there are problems such as 1. The mounting of the driving circuit is large-scale.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a composite liquid crystal display that can reduce visual discomfort.

[Means to solve the problem]

The method for manufacturing a composite liquid crystal display according to the present invention includes a step of crimping and bonding a plurality of substrates to each other at their end surfaces using an adhesive made of a polymeric material, and a laser beam is applied to the adhesive protruding from the surface of the substrates by the crimping. a step of etching the adhesive material by irradiating it to make the level difference with the surface of the substrate 5 μm or less, and a step of sandwiching a liquid crystal between the substrate and a counter substrate facing this substrate to create a display element. It is something that is given.

[Effect]

According to the method of manufacturing a composite liquid crystal display according to the present invention, the bonding area between the substrates of the liquid crystal display can be reduced, and as a result, the non-display area can be reduced and the visual discomfort can be reduced.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Figure 1 (a
) (b) and (c) are process diagrams each showing a method for manufacturing a composite liquid crystal display according to an embodiment of the present invention. The steps in each figure will be explained.

(a) Apply adhesive (6) made of a polymeric material (epoxy adhesive in this case) to the end surfaces of the circuit board (1) of the liquid crystal display, and press the end surfaces of the circuit boards (1) together. and pre-bond. At this time, the back surface of the circuit board (1) may be bonded onto the base board to enhance mechanical strength. (Not shown) The bonding distance between the end surfaces of the circuit boards bonded in this manner is approximately w μm, which can be made smaller than the size of one pixel of a liquid crystal display.

Note that since the adhesive (6) before curing has viscosity, it will naturally protrude from the surface of the circuit board (1).

As will be described later, the gap between the circuit board (1) and the counter substrate (3) must be uniform (5 μm to 10 μm) in a plane, and the protruding adhesive obstructs the formation of this uniform gap. Furthermore, if a circuit pattern is formed on this protruding adhesive, it will be electrically short-circuited to the counter substrate (3), resulting in a display defect. Therefore, this protrusion is removed in the next step.

(b) The protruding adhesive is irradiated with a laser beam (7) and etched to reduce the level difference by 5μ from the surface of the circuit board (1).
In this case, irradiate excimer laser light (1 mJ) in the ultraviolet range for a few seconds to remove the difference in height from 2 to 30 m.
It was set to 3 μm. After this, a circuit pattern may be formed on the smoothed adhesive, and the mounting of the drive circuit can be made smaller.

(C) This bonded circuit board (1) and counter board (3)
) is sealed with a sealing adhesive (4) leaving an appropriate gap (5 μm-10 μm), and liquid crystal (2) is injected to form a composite liquid crystal display. At this time, the counter substrate (3) may also be constructed by bonding a plurality of substrates together, similar to the circuit board (1).

In the above embodiment, an excimer laser was used as the laser beam, but a visible-light Xe laser may also be used.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of substrates are bonded to each other at their end surfaces by pressure bonding using an adhesive made of a polymeric material, and a laser beam is irradiated to the bonding material protruding from the surface of the substrates due to the pressure bonding. and then etched the adhesive material.
A composite liquid crystal display is manufactured by performing a step of making the level difference with the surface of the substrate 5 μm or less, and a step of creating a display element by sandwiching a liquid crystal between the substrate and a counter substrate facing this substrate. This has the effect of reducing visual discomfort.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (C) are process diagrams showing a method for manufacturing a composite liquid crystal display according to an embodiment of the present invention, and FIG. 2 is a cross-sectional configuration diagram showing a conventional composite liquid crystal display. It is. (1)...Circuit board (2)...Liquid crystal (3)...
・Counter substrate (6)...Adhesive (7)...Laser light Note that in the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A step of bonding a plurality of substrates by pressing them together at their end surfaces with an adhesive made of a polymeric material, irradiating the adhesive material protruding from the surface of the substrates due to the pressure bonding with a laser beam to etch the adhesive material, and etching the adhesive material. A method for manufacturing a composite liquid crystal display, which includes the steps of: making the height difference with the surface of a substrate 5 μm or less; and creating a display element by sandwiching a liquid crystal between the above substrate and a counter substrate facing this substrate.