Homeotropic and hybrid alignment types of liquid crystal displays and a manufacturing method thereof
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKAZUHIRO NISHIYAMA, YUKIO TANAKA, KAZUNORI KOMORI, AKIO TAKIMOTO
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Abstract
The present invention is intended to eliminate any leakage of light which would occur, while in a black display state, due to a disordered alignment of liquid crystals around a pixel electrode in a liquid crystal device and to provide an improved contrast. The leakage of light around pixels can be suppressed and the contrast can be improved, for example, by rubbing the surface in a direction at an angle of 45 degrees with respect to any of the edges of a square pixel electrode 25 (a direction shown by the arrow 30) in a homeotropic type liquid crystal device.
Claims6
A liquid crystal device comprising a first substrate which has at least rectangular or square electrodes divided into microstructures, a second substrate which has a transparent electrode, and a liquid crystal layer which is filled between said-two substrates and has a negative anisotropy in dielectric constant wherein a homeotropic alignment is accomplished over said first substrate, characterized in that said alignment over said first substrate is accomplished at an angle of 40 to 50 degrees with respect to any of the edges of an electrode on said first substrate and a homeotropic alignment is accomplished over said second substrate.
A method of manufacturing a liquid crystal device comprising the steps of:
- accomplishing over a first substrate which has at least rectangular or square electrodes divided into microstructures, an alignment at angle of 40 to 50 degrees with respect to any of the edges of an electrode on said first substrate,
- accomplishing a homeotropic alignment over a second substrate which has a transparent electrode, and
- forming a liquid crystal layer between said first and second substrates which has a negative anisotropy in dielectric constant.
A liquid crystal device comprising a first substrate which has at least rectangular or square electrodes divided into microstructures, a second substrate which has a transparent electrode, and a liquid crystal layer which is filled between said two substrates and has a negative anisotropy in dielectric constant wherein a homeotropic alignment is accomplished over said first substrate, characterized in that a homogeneous alignment over said second substrate is accomplished at an angle of 40 to 50 degrees with respect to any of the edges of an electrode on said first substrate.
A method of manufacturing a liquid crystal device comprising the steps of:
- accomplishing a homeotropic alignment over a first substrate which has at least rectangular or square electrodes divided into microstructures,
- accomplishing over a second substrate which has a transparent electrode, a homogeneous alignment at an angle of 40 to 50 degrees with respect to any of the edges of an electrode on said first substrate, and
- forming a liquid crystal layer between said first and second substrates which has a negative anisotropy in dielectric constant.
A reflection type liquid crystal device comprising a first substrate which has at least rectangular or square reflecting electrodes divided into microstructures, a second substrate which has a transparent electrode, and a liquid crystal layer which is filled between said first and second substrates and has a negative anisotropy in dielectric constant and an anisotropy in refractive index An between 0.07 and 0.15 wherein a homeotropic alignment is accomplished over said first substrate, characterized in that said alignment over said first substrate is accomplished at an angle of 40 to 50 degrees with respect to any of the edges of an electrode on said first substrate and a homeotropic alignment is accomplished over said second substrate.
A method of manufacturing a reflection type liquid crystal device comprising a first substrate which has at least rectangular or square reflecting electrodes divided into microstructures, a second substrate which has a transparent electrode, and a liquid crystal layer which is filled between two substrates, such as said first and second substrates and has a negative anisotropy in dielectric constant and an anisotropy in refractive index An between 0.07 and 0.15 wherein a homeotropic alignment is accomplished over said first substrate, characterized in that said alignment over said first substrate is accomplished at an angle of 40 to 50 degrees with respect to any of the edges of an electrode on said first substrate and a homeotropic alignment is accomplished over said second substrate.
Dependencies are inferred from the claim text.