JPH06160869A - LCD panel - Google Patents

Abstract

(57) [Summary] [Object] A liquid crystal display device of the present invention has an object to prevent a phenomenon in which alignment of liquid crystals is disturbed and display quality is deteriorated due to generation of static electricity during manufacturing. [Structure] A metal plating spacer is used as the spacer particles 10 for keeping the liquid crystal layer thickness constant. [Effect] A high DC voltage is not applied to the periphery of the spacer particles, and it is possible to prevent the liquid crystal alignment disorder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel.

[0002]

2. Description of the Related Art A sectional view of a portion sandwiched between transparent electrodes of a conventional liquid crystal panel is shown in FIG.

Conventionally, as the spacer particles 12 for keeping the liquid crystal layer thickness constant, resin-based or silicon oxide-based insulating particles have been used. The specific resistance of the liquid crystal layer 20 is 10 ¹⁰ to 10 ¹¹
On the other hand, the resin-based or silicon oxide-based spacer particles 12 have a specific resistance of 10 ¹⁴ to 10 ¹⁵ Ω · cm, which is 1000 to 10000 times higher than that of about 10 Ω · cm.

[0004]

In the manufacturing process, a high DC voltage may be applied between the upper and lower transparent electrodes due to the generation of static electricity or defective connection of electric circuits. The specific resistance of the resinous or silicon oxide type spacer particles used in the liquid crystal panel having the conventional structure is 1000 to 10000 of that of the liquid crystal material.
Therefore, when a high DC voltage is applied, the electric field is concentrated in the peripheral region of the spacer particles, which deforms the molecular orientation of the liquid crystal material in this region. The alignment disorder was not completely recovered even after the application of the DC voltage was canceled, and the display irregularity was generated when the liquid crystal panel was driven.

[0005]

In order to solve the above problems, spacer particles having higher conductivity than that of the liquid crystal layer are used to prevent alignment disorder of liquid crystal due to application of high voltage around the spacer particles. .

[0006]

In the liquid crystal panel having the structure of the present invention, the spacer particles have higher conductivity than the liquid crystal layer. Therefore, even when a high DC voltage is applied between the upper and lower transparent electrodes, the spacer particles are electrolyzed in the peripheral region of the spacer particles. Are not concentrated, and the alignment disorder of the liquid crystal layer does not occur.

[0007]

EXAMPLE As an example of the present invention, a cross-sectional view of a portion sandwiched between transparent electrodes of a liquid crystal display device using a nickel-plated spacer is shown in FIG. As shown in (Table 1), a panel was prepared so that the distribution density of the nickel-plated spacers 10 having an average particle size of 5.0 to 7.0 μm was 100 to 300 pieces / mm ² .

Regarding a liquid crystal panel using a nickel-plated spacer and a liquid crystal panel using a conventional resin spacer, a DC voltage of 50 V is applied between the upper and lower transparent electrodes 50 and 60, and then multiplex driving is performed to cause liquid crystals around the spacer particles. The state of disordered orientation of the layer 11 was observed. The occurrence rate of orientation disorder for each panel is shown in (Table 1).

[0009]

[Table 1]

As shown in (Table 1), the occurrence rate of alignment disorder around the spacer particles was 60% or more in the case of the liquid crystal panel using the conventional resin spacer, regardless of the average particle diameter and the dispersion density. However, in the case of a liquid crystal panel using a nickel-plated spacer, it could be suppressed to 30% or less.

In this embodiment, the average particle size is 5.0 to
7.0 to 100 μm nickel plated spacer
I made a liquid crystal panel by spraying with a density of 0 pieces / mm ² .
In principle, if the spacer has higher conductivity than the liquid crystal layer, it is considered that the alignment disorder around the spacer particles can be suppressed regardless of the spacer particle size and the dispersion density.

Although nickel-plated spacers are used in this embodiment, other metals or metal-plated spacers may be used as long as they have higher conductivity than liquid crystal.

[0013]

EFFECTS OF THE INVENTION By using spacer particles having higher conductivity than the liquid crystal layer, even if a high DC voltage is applied between the upper and lower transparent electrodes, compared with the liquid crystal layer in a region distant from the spacer particles, Since the voltage applied to the liquid crystal layer around the particles is low, the alignment around the spacer particles is not disturbed.

As described above, according to the present invention, it is possible to prevent the occurrence of alignment disorder around the spacer particles due to the application of a DC high voltage, and to obtain a liquid crystal panel having high contrast and good display uniformity.

[Brief description of drawings]

FIG. 1 is a sectional view of a portion sandwiched between transparent electrodes according to an embodiment of the present invention.

FIG. 2 is a sectional view of a portion sandwiched between transparent electrodes of a conventional liquid crystal panel.

[Explanation of symbols]

 10 Nickel Plated Spacer 11 Area around Spacer Particles 12 Resin or Silicon Oxide Spacer Particles 20 Liquid Crystal Layer 30 Alignment Film 40 Insulating Layers 50, 60 Transparent Electrode 70 Glass Substrate

Claims (2)

[Claims] 1. An insulating layer is formed on at least one transparent electrode of a liquid crystal panel sandwiching a liquid crystal layer between two upper and lower substrates having a transparent electrode, and the liquid crystal layer is formed to keep the liquid crystal layer thickness constant. A liquid crystal panel, characterized in that the spacer particles arranged therein have higher conductivity than the liquid crystal layer. 2. The liquid crystal panel according to claim 1, wherein the spacer particles are made of an insulating material and the surface of which is metal-plated.