JPS60112088A - Passive reflector for liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflective plate or a transflective plate (hereinafter referred to as a reflective plate) VC used in a reflective or transflective liquid crystal display device.

A reflective or transflective liquid crystal display device generally consists of a liquid crystal cell, two polarizing plates placed on both sides of the cell, and a reflective plate placed outside the polarizing plate on the side opposite to the visible side. The reflecting plate is arranged in close contact with the polarizing plate or with a predetermined gap. It is something that has been tested.

Various types of reflectors have been proposed and used so far, such as metal foils such as aluminum with hairline or matte finish surfaces, sheets or films with metal vapor deposited on the treated surface of roughened plastic sheets or films. , a plastic sheet or film in which a light-reflecting powder substance is dispersed, a plastic microfoamed sheet, etc. are widely used.

However, these reflectors have a uniform display area over the entire surface.
In other words, since the entire surface has the same reflective function, reflective or semi-transmissive liquid crystal display devices using this reflector can only provide a monotonous display with no change in the background, and lack decorativeness. Met.

The present invention provides a light reflecting plate that solves these drawbacks, and its gist is that it is a reflecting plate (or semi-transparent reflecting plate) disposed on one side of a liquid crystal cell. , the irregular surface of the reflector is formed with two or more different reflective functions in a pattern.

According to the reflective plate of the present invention, a liquid crystal display device with good decorativeness and easy visibility can be obtained.

The term "reflection function" in the present invention means reflectance or glossiness, and different fouling function means that one or both of the reflectance and glossiness are different by two or more on the same plane. However, the reflectance or glossiness is determined by the physical reflectance of the material, the surface condition, the difference in refractive index with the material in instant contact, etc. Therefore, if the surface condition is the same, -C is also the reflectance. In some cases, the reflectance is the same, but only the glossiness is different. Furthermore, visual expression deviation is due to the pattern or brightness that humans visually perceive within the achromatic color range, and is used in LCD display devices. This means that the amount of light can be obtained.

The reflective plate in the present invention refers to a reflective plate used in a liquid crystal display device when the display light source is used only by reflection from external light. This refers to a transflective plate that is used when the transmitted light is also used when the light is projected, and the former type of reflector can be a single metal foil such as aluminum or a metal foil such as aluminum. Composite of metal foil and plastic layer, roughened plastic sheet or (:
1 A sheet or film with a metal vapor deposited on the treated surface of the film, a plastic sheet or film with a light-reflecting powder material uniformly dispersed therein, a plastic microfoamed sheet, or a plastic sheet or film with the A sheet or film coated with a resin liquid containing a substance can be exemplified.

The method of imparting different reflective functions in a pattern to the reflection direction of such a reflector varies depending on the material of the reflector, but if the reflector is made of metal, the desired areas are masked with adhesive masking. It is effective to perform a treatment such as sandblasting on the exposed areas, and in the case of metal vapor deposition on a roughened plastic base material, it is effective to apply a treatment such as sandblasting to the exposed areas. It is effective to uniformly deposit the metal by tightening or forming a pattern, or to deposit different metals in a pattern on a uniformly roughened surface.

Furthermore, it is effective to obtain a semi-transmissive reflector by applying a resin liquid containing a light-reflecting powder substance in a pattern on its reflective surface, for example.

When a reflective plate having reflective surfaces having different reflective functions obtained by these methods is mounted on a liquid crystal display device, it has the characteristics of providing an easy-to-read display surface with excellent decorativeness and excellent contrast.

The present invention will be specifically explained below with reference to embodiments shown in the drawings.

Example 1 A reflective substrate is obtained by bonding an aluminum foil (thickness: 30/1 m) with hairline treatment on the surface to a polyester film having a thickness of 100/1 m using an adhesive.

An adhesive masking material with rectangular holes is pasted on the aluminum foil surface of this substrate, the exposed foil surface is sandblasted, and then the masking material is peeled off to form a liquid crystal display with different reflective functions. A reflective plate for use was obtained.

FIG. 1 is a perspective view of the obtained reflector, in which 1 is a polyester film, 2 is an aluminum foil with a hairline treatment 3 on the surface, and 4 is a non-directional satin surface treated by sandblasting.

When the reflector formed in this way is combined with a liquid crystal cell that displays a clock so that the non-directional pear-shaped surface part (4) displays the date, and the hairline treated part (3) displays the time, it becomes decorative. I was able to see the excellent, easy-to-read display.

Example 2 An acrylic resin liquid (8) containing 40% by weight solid content of aluminum powder with an average particle size of 10 to 30 μm was added to the surface of a 100 μm thick polyester film, and
70fin% aluminum powder with solid content of 40% by weight
The blended acrylic resin liquid (B) was applied in a pattern as shown in FIG. 2 to obtain a transflective plate having reflective surfaces with different reflective functions.

In FIG. 2, 1 is a polyester film, 5 is a part coated with resin liquid (4), and 6 is a part coated with resin liquid CB).

When the transflective plate thus formed is assembled with a liquid crystal cell for displaying a game, a novel and unexpected display part is obtained in which the display moves to different reflective surfaces depending on the development of the game. was completed.

Note that the reflector is generally placed on the back side of the liquid crystal cell (opposite to the viewing side) with a desired gap or closely spaced, but with the recent trend toward miniaturization (thinner thickness) It is used as

In this case, if the reflective plate has an adhesive layer formed on its surface in advance, it has the advantage of simplifying the mounting work. However, since the level difference absorbing ability due to the viscoelasticity of the viscous thickening layer (thickness is lO ~ 1 (IQ/Im')) is about half or less of the layer thickness,
It is desirable that each pattern be substantially flat with no step difference, or even if there is, the difference should be 50/Im or less.

[Brief explanation of drawings]

1 and 2 are perspective views showing an example of the present invention. Patent applicant Nitto Electric Industry Co., Ltd. Representative Tsuchikata Sanbu Figure/Figure Figure 2

Claims (1)

[Claims] A reflective plate (or semi-transmissive reflective plate) disposed on one surface of a liquid crystal cell, characterized in that the reflective surface of the reflective plate has two or more different reflective functions formed in a pattern. Reflector for LCD display.