JPH03102323A - Liquid crystal panel and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the panel which has no light absence at a spacer part and generates no air bubble at low temperatures by arranging selectively an elastic spacer and a rigid spacer between two substrates. CONSTITUTION:A liquid crystal material 5 is sandwiched between two glass substrates 1a and 1b which have transparent electrodes and a seal material 3 is formed at the peripheral edge part of one substrate 1a. Liquid crystal 5 with which a rigid spacer material 4a is mixed and liquid crystal 5 with which an elastic spacer material 4b is mixed are dripped on the other substrate 1b, then the two substrates are stuck together under a vacuum, and then the seal material is set. Consequently, the rigid spacer material 4a is used, so the number of spacers may be small and light absence is not conspicuous at the spacer part. Further, the spacer material 4b is arranged, so the volumetric shrinkage of liquid crystal at low temperatures is absorbed to prevent air bubbles from being generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal panel and a method for manufacturing the same.

2. Description of the Related Art In general, liquid crystal display devices are thin, lightweight, and consume little power, so they have come to be widely used as display devices in everything from calculators to home appliances, office automation equipment, and the like.

A liquid crystal panel generally has a structure as shown in FIG. 4, in which substrates 1a. A liquid crystal material 5 is sealed between 1b by a sealing material 3. A spacer material 4 is used to maintain a constant gap between the substrates, and is generally made of a rigid material such as glass fiber or an elastic material such as a resin ball. 7 is an alignment film.

Problems to be Solved by the Invention In liquid crystal panels with this structure, the liquid crystal material shrinks in volume when placed in a low temperature environment (-20°C or lower), but if the spacer is made of a rigid material such as glass fiber, In some cases, the volume shrinkage rate of the spacer is one order of magnitude smaller than that of the liquid crystal material, so that bubbles 8 are generated within the panel as shown in FIG.

On the other hand, a spacer made of resin material has elasticity, so the sixth
As shown in the figure, as the liquid crystal material contracts, the gap between the substrates becomes smaller and no bubbles are generated. However, when a resin spacer was used, there were problems described below.

As shown in Figure tJ7, the polarization axis of the incident light is rotated in the liquid crystal layer, but not in a part of the substrate.

Here, 9a and 9b are polarizing plates. Therefore, for example, when the polarizing plates are arranged in parallel, the liquid crystal layer appears black when no voltage is applied, but a portion of the surface area appears white with light passing through. When using resin spacers, the number of spacers must be at least 200 pieces/Wl in order to keep the substrate gap constant and accurate.
2 or more was required, and the omission of part of the subesa was very noticeable.

In view of these problems, the present invention provides a liquid crystal panel that does not generate bubbles at low temperatures and has less light leakage in a part of the substrate.
The purpose is to provide a manufacturing method thereof.

Means for Solving the Problems The present invention achieves the above objects by sandwiching a liquid crystal material between two substrates having transparent electrodes, and using a spacer material having rigidity and a spacer material having elasticity between the two substrates. and are selectively arranged. In addition, the manufacturing method involves forming a sealing material on the periphery of at least one of the substrates that has been subjected to an alignment treatment and has a pair of transparent electrodes, and forming a sealing material on the peripheral edge of at least one of the substrates, and forming a liquid crystal and an elastic material mixed with a rigid spacer material on the other substrate. After selectively dropping liquid crystal mixed with a spacer material having
The two substrates are bonded together in a vacuum, and then the sealing material is cured.

Function: By using a panel having such a structure, since rigid spacers are used, the number of spacers is small, and light leakage is not noticeable. In addition, at low temperatures, the gap between the glasses becomes smaller in the area where the elastic spacer is placed, which absorbs the volume shrinkage of the liquid crystal, thereby preventing the formation of bubbles.

Embodiment An embodiment of the present invention will be explained with reference to FIG. A sealing material 3 is placed on a glass substrate 1a that has been subjected to an orientation treatment on a transparent electrode.
A UV-curable resin is formed by screen printing (the transparent electrode and alignment film are omitted in the drawing).

On the other glass substrate lb, a liquid crystal 2a mixed with 0.05 wt% of glass fiber as a rigid spacer is dropped using a microsyringe in a checkerboard pattern with an interval of 10 squares, and a spherical body of penzoguanamine resin is further added as an elastic spacer. The liquid crystal 2b containing 0.05 wt% of the liquid crystal 2a is dropped at the middle position of the liquid crystal 2a that was dropped earlier. At this time, the total amount of liquid crystals 2a and 2b is set as the amount required for the liquid crystal panel. Next, the two glass substrates 1a and 1b are bonded together in a vacuum chamber, and then the sealing material 3 is irradiated with ultraviolet rays and cured.

FIG. 2 is a cross-sectional view schematically showing the structure of the liquid crystal panel manufactured in this way, where a rigid spacer 4a is placed in the area where the liquid crystal 2a containing a rigid spacer is dropped, and a liquid crystal 2b containing an elastic spacer is placed in the area where the liquid crystal 2a containing a rigid spacer is dropped. Apply elastic baser 4 to the dripped area.
b is placed. In this liquid crystal panel, at a low temperature of -40 DEG C., as shown in FIG. 3, the distance between the substrates becomes smaller in the area where the elastic spacer 4b is arranged, so that the generation of bubbles can be prevented. Further, since the rigid spacer 4a is used, the number of spacers may be 5 to 50 per square 2, and light leakage in a part of the spacer is not noticeable.

The rigid spacer 4a is not limited to glass fiber, but may be any material that has rigidity (for example, a spherical body made of SiO), and the elastic spacer 4b may similarly be made of any material that has elasticity (for example, a spherical body made of polystyrene). body, etc.).

In this embodiment, the liquid crystal 2a containing one rigid spacer and the liquid crystal 2b containing one elastic spacer were arranged in a staggered manner.
As long as the rigid spacer 4a and the elastic spacer 4b do not mix together, other arrangement forms may be used depending on the shape and size of the liquid crystal panel.

Effects of the Invention As described above, according to the present invention, since the rigid spacer and the elastic spacer are selectively arranged in the panel, the substrate spacing becomes smaller in the portion where the elastic spacer is arranged at low temperatures. Therefore, the generation of bubbles can be prevented.

Furthermore, since rigid spacers are used, the number of spacers is small, so that light leakage from a portion of the spacers is not noticeable.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating the manufacturing process of an embodiment of the present invention, FIG. 2 is a sectional view schematically illustrating the structure of a liquid crystal panel according to the present invention, and FIG. 3 is a low temperature diagram of a liquid crystal panel according to the present invention. 4 is a sectional view schematically explaining the structure of a conventional liquid crystal panel; FIG. 5 is a sectional view of a conventional liquid crystal panel using rigid spacers at low temperature; FIG. 6 is a cross-sectional view of a conventional liquid crystal panel using elastic spacers at a low temperature, and FIG. 7 is an explanatory diagram of light leakage through a portion of the spacer. 1a...Glass substrate, 1b...Glass substrate, 2a...Liquid crystal, 2b...Liquid crystal,
3... Seal material, 4a... Rigid spacer 4b... Elastic spacer 5...
·liquid crystal.

Claims (2)

[Claims] (1) A liquid crystal panel in which a liquid crystal material is sandwiched between two substrates having transparent electrodes, and an elastic spacer material and a rigid spacer material are selectively arranged between the two substrates. (2) A sealing material is formed on the peripheral edge of at least one of the substrates that has been subjected to alignment treatment and has a pair of transparent electrodes, and the other substrate has a liquid crystal mixed with an elastic spacer material and a rigid structure. After selectively dropping liquid crystal mixed with a spacer material, bonding the two substrates together in a vacuum,
A method for manufacturing a liquid crystal panel in which the encapsulant is then cured.