Reflective-type liquid crystal display device including resin layer with fine particles
View Patent ↗The present invention provides a reflective-type liquid crystal display device with a reflection electrode thereof formed on a resin binder layer wherein a number of fine particles are mingled in the resin binder layer and protrude their upper portions from the resin binder layer to make an upper surface of the resin binder layer rough, and improves reflection property thereof while simplifying a structure and manufacturing process therefor.
1. A reflective-type liquid crystal display device comprising:
a liquid crystal layer interposed between a first substrate and a second substrate;
a reflective electrode being formed on an inside surface of the first substrate and reflecting incident light from the second substrate back toward the second substrate;
a resin layer into which a plurality of fine particles are embedded and fixed therein being disposed between the first substrate and the reflective electrode;
a leveling layer being formed between the resin layer and the reflective electrode;
an insulation film formed on the reflective electrode; and
a pixel electrode formed on the insulation film, wherein
upper portions of the fine particles protrude from the resin layer to increase a degree of roughness of a reflection surface of the reflective electrode,
the leveling layer covers the resin layer and the upper portions of the fine particles to moderate the degree of roughness of the reflection surface of the reflective electrode, and
the pixel electrode is disposed above the reflective electrode and made of a transparent conductive film.
2. A reflective-type liquid crystal display device according to claim 1 , wherein switching elements for selecting pixels are provided in the inside surface of the first substrate.
3. A reflective-type liquid crystal display device according to claim 1 , wherein a color filter is provided in an inside surface of the second substrate.
4. A reflective-type liquid crystal display device according to claim 1 , wherein a color filter is provided in the inside surface of the first substrate.
5. A reflective-type liquid crystal display device according to claim 4 , wherein the color filter is provided at side of the reflective electrode close to the second substrate.
6. A reflective-type liquid crystal display device according to claim 1 , wherein spacer beads or columnar spacers for preserving a gap between the pair of substrates at a predetermined value are provided therebetween, and the fine particles are finer than the spacer beads or the columnar spacers.
7. A reflective-type liquid crystal display device according to claim 1 , wherein the resin layer is photosensitive.
8. A reflective-type liquid crystal display device according to claim 7 , wherein the fine particles have photo-absorbency.
9. A reflective-type liquid crystal display device according to claim 1 , wherein the fine particles are made of epoxy resin or glass.
10. A reflective-type liquid crystal display device according to claim 1 , wherein the reflective electrode is a thin metal film formed on the leveling film.
11. A reflective-type liquid crystal display device according to claim 10 , wherein the thin metal film is made of Al, Al-Nd, Cr, Ag, and a combination thereof.
12. A reflective-type liquid crystal display device according to claim 10 , wherein the thin metal film is formed on the leveling film by a sputtering method.
13. A reflective-type liquid crystal display device according to claim 1 , wherein an upper surface roughness of the reflective electrode form on the leveling film is not less than 1.2 μm.
14. A reflective-type liquid crystal display device according to claim 13 , wherein an upper surface roughness of the reflective electrode is in a range of 1.2-2.0 μm.