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US 5,576,862 AGranted
Positive orientations of liquid crystal molecules in a multi-domain liquid crystal display cell
AssigneeStanley Electric Co., Ltd.
InventorsTakashi Sugiyama, Yasuo Toko, Shunsuke Kobayashi, Yasufumi Iimura
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Abstract
A liquid crystal display cell comprising a pair of substrates, a liquid crystal material sandwiched between the pair of substrates, and an optical polarization memory film provided on one or both of the substrates. The optical polarization memory film is exposed by polarized lights to produce a positive orientation means including a multiple micro domains. In the micro domains, orientation direction is uniform in each domain and substantially isotropic as a whole. The visual angular dependency is eliminated. No rubbing treatment is done, and problems caused by rubbing can be solved.
Claims30
A liquid crystal display cell comprising:
- a pair of transparent substrates,
- a layer of liquid crystal molecules sandwiched between said pair of transparent substrates;
- means for positively orientating liquid crystal molecules, disposed on at least one of said substrates and having a multiplicity of micro domains with different orientation directions, the orientation direction being uniform in each micro domain;
- and
- orientation directions of said micro domains occur in substantially every direction at substantially equal probability.
2 more elements
A method of manufacturing a liquid crystal display cell:
- forming positive orientation means on at least one of a pair of transparent substrates, which forms a multiplicity of micro domains having different orientation directions to one another, each of said micro domains having a uniform orientation direction;
- and
- disposing liquid crystal material between said pair of transparent substrates;
- and
- said step of forming a positive orientation means comprises the steps of:
- transmitting a laser light through a polarizer mask having distributed multiple micro domains with different polarization directions;
- and
- irradiating a transmitted light through said mask on an orientation film having polarization memory characteristics.
5 more elements
A liquid crystal display cell comprising:
- a pair of transparent substrates,
- a layer of liquid crystal molecules sandwiched between said pair of transparent substrates;
- means for positively orientating liquid crystal molecules, disposed on at least one of said substrates and having a multiplicity of micro domains with different orientation directions, the orientation direction being uniform in each micro domain;
- and
- a plurality of pixels;
- said positive orientation means defines, on at least one of said transparent substrates, at least one set of four micro domains having a different orientation direction including a pre-tilt angle, within a pixel region;
- and
- said four micro domains have orientation directions differing by one of (i) 90.degree. and (ii) 180.degree. between adjacent micro domains.
5 more elements
A method of manufacturing a liquid crystal display cell, comprising the steps of:
- forming positive orientation means on at least one of a pair of transparent substrates, which forms a multiplicity of micro domains having different orientation directions to one another, each of said micro domains having a uniform orientation direction;
- and
- disposing liquid crystal material between said pair of transparent substrates;
- wherein said step of forming positive orientation means comprises a step of forming an orientation film having an optical polarization memory characteristic on said at least one transparent substrate, and, while irradiating a polarized laser light of a beam spot of a size of said micro domain on said orientation film having an optical polarization memory characteristic, moving said spot of irradiation to scan said orientation film.
1 more element
A method of manufacturing a liquid crystal display cell:
- forming positive orientation means on at least one of a pair of transparent substrates, which forms a multiplicity of micro domains having different orientation directions to one another, each of said micro domains having a uniform orientation direction;
- and
- disposing liquid crystal material between said pair of transparent substrates;
- and
- said step of forming a positive orientation means forms a multiplicity of sets of four micro domains having different orientation directions on at least one of said pair of transparent substrates;
- the orientation direction of said four micro domains being different by one of (i) 90.degree. and (ii) 180.degree. between two adjacent micro domains.
3 more elements
A method of manufacturing a liquid crystal display cell:
- forming positive orientation means on at least one of a pair of transparent substrates, which forms a multiplicity of micro domains having different orientation directions to one another, each of said micro domains having a uniform orientation direction;
- and
- disposing liquid crystal material between said pair of transparent substrates;
- and
- said step of forming a positive orientation means comprises the steps of:
- forming transparent electrodes at a pixel region on surfaces of said transparent substrates, and
- forming a cut-off portion of a predetermined shape in a part of one of said transparent electrodes,
- wherein multiple sets of two micro domains having approximately zero tilt and orientation directions different by 90.degree. to each other are formed in the cell.
5 more elements
Dependencies are inferred from the claim text.