JPS6252530A - Liquid crystal panel - Google Patents

Abstract

PURPOSE:To extremely shorten the distance from picture elements to the periphery of substrates without the excess swelled out part of thermoplastic resin adhesive agents from a panel by using a sheet having the thermoplastic resin adhesive agent layer on both faces to adhere two sheets of the substrates. CONSTITUTION:Electrode wirings 2 are formed on the 1st substrate 1 and further an oriented film 3 is coated to the prescribed region on the 1st substrate 1. Spherical spacers 4 are provided thereon. The sheet 7 formed with the layers of the thermoplastic resin adhesive agents 8, 9 on both faces is held in place between the sealing parts of the 1st and 2nd substrates 1 and 5, then pressure and heat are applied to the direction shown by 10. The thermoplastic resin adhesive agents 8, 9 are softened by heating in this stage. The swelling out of the adhesive agents 8, 9 can be considerably decreased by preliminarily setting the suitable thickness and heating time thereof. Finally, the gap between two sheets of the substrates 1 and 5 is determined by the spherical spacers 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to panels used for various displays.

2. Description of the Related Art A typical conventional liquid crystal panel is shown in FIG. The second substrate 25 is a sealing resin.

First, as shown in Figure 2, adhesive 2 is applied onto the transparent substrate 21.
2 is formed in a pattern, for example, by a screen printing method. Glass fibers are mixed in this adhesive 22 to regulate the gap. Since the adhesive 22 has the role of bonding the two substrates together as well as the role of holding the glass fiber, the amount thereof is larger than necessary.

Unfortunately, when the two substrates are bonded together, excess adhesive will ooze out, and the design requires a considerable amount of leeway in the bonding area.

The wiring pattern on the substrate 21 is omitted. Next, as shown in FIG. 2B, the second substrate 24 is overlapped and bonded. In this state, the injection port 23 is open. After injecting liquid crystal through the injection port 23, the liquid crystal panel is completed by sealing with a suitable sealing resin 25.

Problems to be Solved by the Invention In such a conventional configuration, the adhesive 22 around the board may protrude into the pixel area or overflow to the outside and land on the leader line (not shown), causing interference with external circuits. Failures may occur during electrical connection. In addition, for example, when cutting the peripheral part of an LCD panel near the pixels and joining them together to make a larger panel, it is difficult to cut near the pixels with conventional methods, and the gap between the seams becomes wide, resulting in an unnatural appearance. Ta. The present invention solves these problems and easily provides a more advanced liquid crystal panel.

Means to Solve the Problem In order to solve this problem, the present invention uses a sheet having thermoplastic adhesive layers on both sides, and has a structure in which two substrates are bonded together.

Effect By adopting the above structure, the adhesive formed on both sides of the sheet only needs to be in the minimum amount necessary to bond the substrate, and the spread of the thermoplastic resin adhesive is thermosetting. It can be used much less than adhesives.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the main parts of a vessel for explaining an embodiment of the present invention, and FIGS. 2A and B are cross-sectional views of the same manufacturing process. In FIGS. 2 is the first substrate 1
Upper electrode wiring, 3 is an alignment film, 4 is a spherical spacer, 5
is the second substrate, 6 is the electrode wiring on the second substrate 5, 7 is the sheet, 8 and 9 are the thermoplastic resin adhesive layers, 10 is the direction of pressure/heating, and 11 is the direction for injecting the liquid crystal. It is space.

As shown in FIG. 2, electrode wiring 2 is formed on the first substrate 1. Furthermore, an alignment film 3 is applied to a predetermined area on the first substrate 1, and spherical spacers 4 are scattered thereon. Next, as shown in FIG. 2B, a sheet 7 on which a layer of thermoplastic resin adhesive 8.9 is formed on both sides is sandwiched between the sealing parts of the first and second substrates 1 and 5, as shown at 10. Apply pressure and heat in the direction 0 At this time, the thermoplastic resin adhesives 8 and 9 will soften due to heating, but by setting the appropriate thickness and heating time, the protrusion of the thermoplastic resin adhesives 8 and 9 can be minimized. can be reduced to Thus, the two substrates 1.5 are bonded together as shown in FIG. Finally, the gap between the two substrates 1.5 is determined by the spherical spacer 4.

The sheet 7 must be approximately 10 microns thick, so for example, a thin aluminum foil with oxidized on one or both sides may be made of FEP (Fluorinated Ethyl).
It is best to use a thermosetting adhesive such as ene propylene. If necessary, an elastic plastic sheet is used as the material for the sheet 7.

Finally, liquid crystal is injected from the injection port, but regarding this injection port, there is a method of making a cut in advance when pasting the door, and a method of making the injection port in a separate place from the part when pasting the sheet. There is.

Effects of the Invention As described above, according to the present invention, the thickness of the thermoplastic resin adhesive for sealing can be reduced, and since the thermoplastic adhesive is used, the softening time of the adhesive is short, so that the adhesive There is no extra protrusion.

For this reason, the distance from the pixel to the periphery of the substrate can be made very short.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a liquid crystal panel according to an embodiment of the present invention;
Figure 2 is a cross-sectional view showing the manufacturing process, Figure 3 is A-C.
1 is a perspective view showing the manufacturing process of a conventional liquid crystal panel. DESCRIPTION OF SYMBOLS 1... First substrate, 2... First electrode wiring on the substrate, 3... Alignment film, 4...
Spacer, 5...Second board, 6...
・Electrode wiring on the second substrate, 7...Sheet, 8
, 9...Thermoplastic resin adhesive, 1o...
・Direction of pressurization and heating, 11... Space where liquid crystal is injected. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (4)

[Claims] (1) A liquid crystal panel characterized in that the sealing portions of the first and second substrates except for the liquid crystal injection portions are sealed with a sheet having thermoplastic resin adhesive layers formed on both sides. (2) The liquid crystal panel according to claim 1, wherein the sheet is a thin metal film with insulating layers formed on both sides. (3) The liquid crystal panel according to claim 2, wherein the metal thin film is aluminum foil and the insulating layer is an anodized alumina film. (4) The liquid crystal panel according to claim 1, wherein the sheet is made of an elastic resin.