US 6,204,903 B1 · Reflector, reflective polarizing plate and reflective liquid crystal display

Abstract

A reflector having one or two reflection angles exhibiting maximums in an angle-dependent distribution curve of intensity of reflected light which is generated when light is illuminated from a light source on the surface of the reflector at specific angles, wherein at least one angle exhibiting the maximum deviates by at least 5 degrees from a regular reflection angle in relation to the incidence angle of the light, and the surface roughness of the reflector is between 200 nm and 1500 nm in terms of a center line average roughness (Ra), and a semi-transmissive reflector having one or two reflection angles which exhibit maximums in an angle-dependent distribution curve of intensity of reflected light which is generated when light is illuminated from a light source on the surface of the reflector at specific angles, wherein at least one angle exhibiting the maximum deviates by at least 5 degrees from a regular reflection angle in relation to the incidence angle of the light. A reflective liquid crystal can display bright images with good visibility, when such a reflector is attached on the liquid crystal display and the screen is viewed from an angle at which the reflection of the external light is avoided.

Claims18

Dependent claims

A reflector having only one or two reflection angles which exhibit maximums in an angle-dependent distribution curve of intensity of reflected light which is generated when light is illuminated from a light source on the surface of the reflector at specific angles,

wherein at least one angle exhibiting said maximum deviates by at least 5 degrees from a regular reflection angle with respect to the horizontal plane of the reflector in relation to the incidence angle of the light, and the surface roughness of the reflector is between 200 nm and 1500 nm in terms of a center line average roughness (Ra),
wherein the surface part of said reflector is in the shape of similar or congruent triangular prisms, depressions or projections with cross sections, which appear in at least one direction, forming an asymmetric wave, or pyramids, which are arranged in adjacent to each other form slopes on the surface of said reflector, each having i) a bottom length of 10 to 500 μm and ii) an elevation or depression angle of 2.5 to 10 degrees, and
wherein the surfaces of said prisms, depressions or projections, or said pyramids are roughened to have a surface roughness of in the range between 200 nm and 1500 nm in terms of a center line average roughness (Ra).

A semi-transmissive reflector having only one or two reflection angles which exhibit maximums in an angle-dependent distribution curve of intensity of reflected light which is generated when light is illuminated from a light source on the surface of the reflector at specific angles,

wherein at least one angle exhibiting said maximum deviates by at least 5 degrees from a regular reflection angle with respect to the horizontal plane of the reflector in relation to the incidence angle of the light,
wherein the surface part of said reflector is in the shape of similar or congruent triangular prisms, depressions or projections with cross sections, which appear in at least one direction, forming an asymmetric wave, or pyramids, which are arranged in adjacent to each other form slopes on the surface of said reflector, each having i) a bottom length of 10 to 500 μm and ii) an elevation or depression angle of 2.5 to 10 degrees, and
wherein the surfaces of said prisms, depressions or projections, or said pyramids are roughened to have a surface roughness of in the range between 200 nm and 1500 nm in terms of a center line average roughness (Ra).

Dependencies are inferred from the claim text.

Reflector, reflective polarizing plate and reflective liquid crystal display

Life of this patent

Reflector, reflective polarizing plate and reflective liquid crystal display

Life of this patent

Abstract

Claims18