JPH05142548A - LCD display panel - Google Patents

Abstract

PURPOSE:To enable the uniform gap control between electrode substrates and to prevent the generation of bubbles when the liquid crystal display panel is rested at a low temp. by disposing hollow spacers having a specific average grain size into the panel. CONSTITUTION:The hollow spacer materials 2 having 1 to 20mum average diameters are dispersely disposed as spacing control particles by a spraying method, etc., on the inside surface of either of the upper electrode substrate or lower electrode substrate of the electrode substrates 1 which consist of transmissive glass substrates and are formed with transparent electrodes on the inside surface side. In addition, a liquid crystal material 3 is provided. The liquid crystal material 3 consisting of an org. polymer has the higher coefft. of thermal expansion to the glass constituting the electrode substrates 1 and, therefore, such a deformation as to diminish the cell gap is generated by the volumetric shrinkage of the liquid crystal material 3 when the panel is rested in a low-temp. atmosphere. The spacers 2 are, however, made deformable at the time of resting at the low temp. by using the hollow spacer materials 2. The drop of the internal pressure is relieved and the generation of the bubbles is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel, and more particularly to a structure of a spacer which is effective in preventing bubbles from appearing at low temperatures.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional liquid crystal display panel. In Fig. 3, 1 is the electrode substrate, and 3
Is a liquid crystal and 5 is a spacer material. On the LCD panel,
In order to secure a predetermined cell gap, a spherical or columnar spacer material 5 made of silica, alumina, plastic, or the like is arranged between the upper and lower electrode substrates 1 facing each other so as to be in contact with the inner surfaces of both electrode substrates 1. I am allowed to do it.

[0003]

However, in the liquid crystal display panel thus constructed, the glass constituting the electrode substrate, the spacer material dispersed to secure the cell gap, and the thermal expansion coefficient of the liquid crystal material are different from each other. Since the liquid crystal display panels are significantly different from each other, there is a drawback that when the liquid crystal display panel is left in a low temperature atmosphere, bubbles, that is, a non-existing portion of the liquid crystal material is generated on the effective display surface.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal display panel in which uniform gap control between electrode substrates is prevented and bubbles are prevented from being generated when left at a low temperature. It is a thing.

[0005]

In order to solve this problem, the present invention provides a hollow spacer material for securing a cell gap of a liquid crystal display panel.

[0006]

According to the above means, the spacer material having the hollow portion is deformed when the liquid crystal material contracts in volume when left at a low temperature,
This reduces the pressure decrease inside the liquid crystal display panel and prevents the generation of bubbles.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. It should be noted that the following (FIG. 1) is only shown schematically for easy understanding of the present invention, and transparent electrodes, alignment films, color filters, thin film transistors, etc. are omitted.

FIG. 1 is a sectional view of a liquid crystal display panel according to the present invention. Reference numeral 1 denotes an electrode substrate made of a translucent glass substrate and having a transparent electrode formed on the inner surface side thereof. On one of the inner surfaces of the upper electrode substrate and the lower electrode substrate, as an interval control fine particle, for example, an average diameter of about 6 μm Hollow spacer materials 2 are dispersed and arranged by a spray method or the like. 3 is a liquid crystal material.

FIG. 2 is a sectional view when the liquid crystal display panel of FIG. 1 is left at a low temperature. Since the liquid crystal material composed of organic molecules has a larger coefficient of thermal expansion than the glass constituting the electrode substrate 1, when the liquid crystal material is left in a low temperature atmosphere, the liquid crystal material contracts in volume to cause a cell like (Fig. 2). Deformation occurs such that the gap becomes smaller. Since the conventional spacer material is hardly deformed even when such a stress is applied, bubbles are generated in the liquid crystal layer, that is, a portion where the liquid crystal material is absent.

However, if a hollow spacer material such as 2 in (Fig. 1) is used, the spacer material will remain (Fig. 2) when left at a low temperature.
4a, 4b, 4c can be deformed, and the decrease in internal pressure can be relieved, so that no bubbles are generated.

As described above, according to the present invention, by disposing the hollow spacer material in the liquid crystal display panel, it is possible to control the uniform gap between the electrode substrates and to prevent the generation of bubbles when left at a low temperature. Can be prevented.

Good results were obtained when the average diameter of the spacer material was in the range of 1 to 20 μm.

[0013]

As is apparent from the above description, according to the present invention, by disposing a hollow spacer material in a liquid crystal display panel, it is possible to control a uniform gap between electrode substrates and to leave it at a low temperature. It is possible to realize an excellent liquid crystal display panel that can prevent the generation of bubbles.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid crystal display panel in which a spacer material is arranged according to an embodiment of the present invention.

[Figure 2] Cross-section of Figure 1 when left at low temperature

FIG. 3 is a cross-sectional view of a liquid crystal display panel in which a conventional spacer material is arranged.

[Explanation of symbols]

 1 Electrode substrate 2 Spacer material 3 Liquid crystal 4a, 4b, 4c Spacer material 5 Spacer material

Claims (1)

[Claims] 1. A liquid crystal display panel comprising a glass substrate and a pair of substrates for liquid crystal display, each having a transparent electrode of a required pattern and an alignment film formed thereon, facing each other with a spacer material interposed therebetween, wherein the average diameter of the spacer material is 1 to 20 μm. And a liquid crystal display panel having a hollow interior.