Liquid crystal device, method of manufacturing the same, and electronic apparatus
View Patent ↗A liquid crystal device includes a pair of substrates with a liquid crystal layer interposed therebetween. A reflective display region for reflective display and a transmissive display region for transmissive display are provided in a subpixel region. A retardation film is provided in a region of one of the pair of substrates corresponding to the reflective display region. The retardation film is formed by laminating a plurality of liquid crystal material layers with an alignment film interposed therebetween.
1. A liquid crystal device comprising:
a pair of substrates with a liquid crystal layer interposed therebetween,
wherein a reflective display region for reflective display and a transmissive display region for transmissive display are provided in a subpixel region,
a retardation film is provided in a region of a first one of the pair of substrates corresponding to the reflective display region, and a resin layer is provided in a region of a second one of the pair of substrates corresponding to the reflective display region, the retardation film and the resin layer both protruding toward the liquid crystal layer to reduce a thickness of the liquid crystal layer in the reflective display region,
the retardation film has a layered structure of a plurality of liquid crystal material layers with a first alignment film interposed therebetween, and
a second alignment film formed on an inner surface of the retardation film and that coats the entire surface of the reflective display region and the transmissive display region,
wherein alignment directions of each of the plurality of liquid crystal material layers are in parallel with alignment-directions of the other liquid crystal material layer,
wherein the resin layer has an uneven resin layer surface, and a reflecting layer is formed on the resin layer and has an uneven reflecting layer surface following the uneven surface of the resin layer, and
wherein a common electrode is provided directly on the uneven reflecting layer surface of the reflecting layer, an interlayer insulating film is provided on the common electrode, and an pixel electrode is provided on the interlayer insulating film, and each of the common electrode, interlayer insulating film and pixel electrode are formed in both the reflective display region and the transmissive display region.
2. The liquid crystal device according to claim 1 ,
wherein the retardation film protrudes toward the liquid crystal layer, and
the thickness of the liquid crystal layer in the reflective display region is smaller than the thickness of the liquid crystal layer in the transmissive display region.
3. The liquid crystal device according to claim 1 ,
wherein at least one liquid crystal material layer among the plurality of liquid crystal material layers contains a liquid crystal material having a birefringence different from the birefringence of the other liquid crystal material.
4. The liquid crystal device according to claim 1 ,
wherein each of the plurality of liquid crystal material layers contains a liquid crystal material having the same birefringence.
5. The liquid crystal device according to claim 1 ,
wherein the retardation film has a half-wave phase difference, and the liquid crystal layer in a region where the retardation film is formed has a quarter-wave phase difference.
6. A method of manufacturing a liquid crystal device,
which includes a pair of substrates with a liquid crystal layer interposed therebetween, a reflective display region for reflective display and a transmissive display region for transmissive display being provided in a subpixel region, and a retardation film having a layered structure of a plurality of liquid crystal material layers being provided in a region of a first one of the pair of substrates corresponding to the reflective display region, a second alignment film is formed on an inner surface of the retardation film and that coats the entire surface of the reflective display region and the transmissive display region, and a resin layer is provided in a region of a second one of the pair of substrates corresponding to the reflective display region, the retardation film and the resin layer both protruding toward the liquid crystal layer to reduce a thickness of the liquid crystal layer in the reflective display region,
wherein the process of foil ing the retardation film includes:
forming a first alignment film on the one substrate;
coating the alignment film with a liquid crystal material;
curing the liquid crystal material while the liquid crystal material is aligned by the alignment film to form one of the plurality of liquid crystal material layers; and
repeatedly performing the forming of the first alignment film, the coating of first the alignment film, and the curing of the liquid crystal material multiple times to form the retardation film having the plurality of liquid crystal material layers,
wherein alignment directions of each of the plurality of liquid crystal material layers are in parallel with alignment-directions of the other liquid crystal material layer,
wherein the resin layer has an uneven resin layer surface, and a reflecting layer is formed on the resin layer and has an uneven reflecting layer surface following the uneven surface of the resin layer, and
wherein a common electrode is provided directly on the uneven reflecting layer surface of the reflecting layer, an interlayer insulating film is provided on the common electrode, and an pixel electrode is provided on the interlayer insulating film, and each of the common electrode, interlayer insulating film and pixel electrode are formed in both the reflective display region and the transmissive display region.
7. The method according to claim 6 ,
wherein at least one liquid crystal material layer among the plurality of liquid crystal material layers contains a liquid crystal material having a birefringence different from the birefringence of the other liquid crystal materials.
8. The method according to claim 6 ,
wherein each of the plurality of liquid crystal material layers contains a liquid crystal material having the same birefringence.
9. An electronic apparatus comprising the liquid crystal device according to claim 1 .
10. A liquid crystal device comprising:
a pair of substrates with a liquid crystal layer interposed therebetween,
wherein a reflective display region for reflective display and a transmissive display region for transmissive display are provided in a subpixel region,
a retardation film is provided in a region of a first one of the pair of substrates corresponding to the reflective display region, and a resin layer is provided in a region of a second one of the pair of substrates corresponding to the reflective display region, the retardation film and the resin layer both protruding toward the liquid crystal layer to reduce a thickness of the liquid crystal layer in the reflective display region,
the retardation film has a layered structure of a plurality of liquid crystal material layers with a first alignment film interposed therebetween, and
a second alignment film is formed on an inner surface of the retardation film and that coats the entire surface of the reflective display region and the transmissive display region,
wherein each of the plurality of liquid crystal material layers contains a liquid crystal material having the same birefringence,
wherein the resin layer has an uneven resin layer surface, and a reflecting layer is formed on the resin layer and has an uneven reflecting layer surface following the uneven surface of the resin layer, and
wherein a common electrode is provided directly on the uneven reflecting layer surface of the reflecting layer, an interlayer insulating film is provided on the common electrode, and an pixel electrode is provided on the interlayer insulating film, and each of the common electrode, interlayer insulating film and pixel electrode are formed in both the reflective display region and the transmissive display region.