JPH0363628A - Spacer and formation thereof - Google Patents

Abstract

PURPOSE:To improve image quality by forming columnar projecting parts at prescribed intervals as the spacers of a liquid crystal display device. CONSTITUTION:Polished glass 4 is etched to form recesses of a prescribed area and depth at prescribed intervals. The liquid crystal sealing side of a glass substrate 3 is coated with a UV curing type transparent resin. This forming mold is brought into pressurized contact with the resin coated surface and is irradiate with UV rays from a UV light source 7 to cure the coating layer 2. The projecting spacers 1 are formed on the coating layer 2 in such a manner. The spacings between picture elements and picture elements are formed by determining the positions of the spacers in such manner. The light leakage in the picture elements caused by the scattering of the beads which is heretofore executed is thereby obviated and the image quality having the high contrast of lightness and saturation is obtd.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a liquid crystal display device.

<Prior Art> In general, in a liquid crystal display device, uniform control of the gap between the substrates is an important element that influences the display quality of the liquid crystal display device. As a method for controlling the gap between the two substrates, a spacer is mixed into the seal portion to make the thickness of the seal portion constant, and spacers are dispersed inside the cell to keep the gap between the two substrates constant.

Spherical or columnar glass fiber powder (beads) is used as a spacer.

<Problems to be solved by the invention> As liquid crystal panels become larger and STN liquid crystals are adopted,
Dimensional accuracy and uniformity of substrate gaps have become more required than ever before. Even with the conventional control method using beads, it is possible to respond to substrate gaps with high precision by dispersing more beads. However, beads have the property of scattering light in liquid crystal, and by increasing the amount of beads, even in the mode where light is blocked, there is light leakage due to diffuse reflection from the beads, which causes deterioration of image quality such as contrast. It has become.

Means for Solving the Problems> The present invention is a spacer and a method for forming the same, which are formed by the following steps.

B. The process of etching polished glass to form recesses of a predetermined area and depth at predetermined intervals to create a molded wall.

The process of coating the opening and the liquid crystal enclosure side of the substrate with UV-curable transparent resin.

At this time, the area is smaller than the gap between pixels of the liquid crystal panel, and the depth is a depth corresponding to the width of the gap between the substrates.

C. Pressing the mold onto the resin-coated surface and curing the coating layer by irradiating ultraviolet rays from the mold side.

2. Peeling off the molded wall.

Function> The columnar convex portion made of ultraviolet curable resin whose bottom is formed by a molded wall made of polished glass serves as a spacer to control the gap between the substrates when bonding two glass substrates together. Also,
Since the molded wall is made of polished glass, the resin surface of the flat part has a smoothness corresponding to that of the substrate, and there is no problem with the liquid crystal.

While conventional beads are scattered all over the pixel surface, the spacers according to the present invention can be formed in optimal locations, such as gaps between pixels that are unrelated to the display.

Since this invention is a method of curing the resin while keeping the polished glass in close contact with it, it is necessary to use a resin that does not generate a solvent (solvent-free type), and an ultraviolet curable resin is most suitable.

Moreover, when using this invention, after forming the spacer, the IT
Formation of the O film requires patterning and orientation treatment, but sputtering is used for film attachment, offset printing is used for patterning, and conventional methods can be used for orientation. Since the resist film is printed with a blanket cylinder, the difference in height in units of cubic meters is not a problem, and the same is true in the alignment process.

<Effect of the invention> By accurately determining the position of the spacer that maintains the gap between the substrates and forming it in the gap between the pixels, the light leakage phenomenon in the pixels that occurs when scattering beads in the past is eliminated, and the brightness and I was able to obtain image quality with high contrast in color saturation.

In addition, spacers can be formed at the same time when forming coating layers such as the FF1 layer and leveling layer, which are added to obtain the resistance and smoothness of color filters, etc.
There is no need to increase the number of processes.

1 is a cross-sectional view of a liquid crystal panel using a sensor.

1 is a spacer part, 2 is a coating layer, 3 is a glass substrate, 4 is polished glass, 5 is a bead, 6 is a pixel electrode,
7 is an ultraviolet light source.

Claims (2)

[Claims] (1) When forming a coating layer using transparent resin on the inside of opposing substrates of a liquid crystal display device, a mold is used to form a columnar convex portion with a predetermined area and height on one substrate. Spacers formed on the coating layer at intervals,
As the transparent resin, an ultraviolet curing transparent resin is used. (2) A method for forming a spacer according to claim (1), comprising the following steps. B. A process of etching polished glass to form recesses of a predetermined area and depth at predetermined intervals to create a mold. B. The process of coating the liquid crystal sealed side of the substrate with ultraviolet curing transparent resin. C. Pressing the mold onto the resin-coated surface and curing the coating layer by irradiating ultraviolet rays from the mold side. D. A step of peeling off the mold.