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US 5,477,359 AGranted
Liquid crystal projector having a vertical orientating polyimide film
AssigneeSharp Kabushiki Kaisha
InventorTsuyoshi Okazaki
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AssigneeSharp Kabushiki Kaisha
InventorTsuyoshi Okazaki
Estimating the term…
In the present invention, a liquid crystal projector has a reflective type liquid crystal element having opposed substrates and a liquid crystal layer between the substrates and projects a light image generated by the reflective type liquid crystal element. A orienting means of liquid crystal molecules provided in the reflective type liquid crystal element is a polyimide film with a vertical orientating characteristic as an orientation means. By rubbing the orienting means, a angle of inclination (pre-tilt angle) is predetermined. By using the reflective type liquid crystal element, the liquid crystal projector has a excellent light stability and a excellent display quality.
A liquid crystal projector having a reflective type liquid crystal element including opposed substrates and a liquid crystal layer between said substrates, said projector for projecting a light image generated by said reflective type liquid crystal element, said projector comprising an orienting means disposed in said reflective type liquid crystal element for orienting liquid crystal molecules of said liquid crystal layer, said orienting means being made of a polyimide film with a vertical orientating characteristic, and being rubbed so as to orient said liquid crystal molecules at a predetermined angle of inclination as a pre-tilt angle, and said liquid crystal layer comprising a nematic liquid crystal with a negative dielectric anisotropy having an operating mode of the deformation of vertical aligned phase type electrically controlled birefringence mode.
Dependencies are inferred from the claim text.
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By organic films, e.g. polymeric films: polyimide, polyamide-imide
Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers: for homeotropic alignment
Active matrix addressed cells: through-hole connection of the pixel electrode to the active element through an insulation layer
Function characteristic: reflective
Term ended 21 Jan 2014 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a liquid crystal projector which is excellent in light stability.
2. Description of the Related Art
FIG. 1 is a sectional view showing a simplified arrangement of an optical addressed liquid crystal light valve according to the first embodiment.
FIG. 2 is a graph showing a relation between a rubbing density and a pre-tilt angle,
FIG. 3 is a sectional view showing a simplified arrangement of a rubbing device used in this invention,
Later, the description will be oriented to the embodiments of the present invention with reference to the drawings.
The following embodiments show methods for fabricating reflective type liquid crystal elements provided for a liquid crystal projector of the present invention.
Embodiment 1 shows a method for fabricating an optical addressed liquid crystal light valve.