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US 5,472,635 AGranted
Phase plate and liquid crystal display using same
AssigneesNippon Oil Co., Ltd., Ricoh Company, Ltd.
InventorsShigeki Iida, Takehiro Toyooka, Hiroyuki Itoh, Yasuyuki Takiguchi, Akihiko Kanemoto, Haruo Iimura
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Abstract
Provided is a phase plate comprising a light transmitting base, an alignment layer formed on said base, and a film formed on said alignment layer by a liquid crystalline polymer which exhibits a nematic orientation in the state of liquid crystal and assumes a glassy state at a temperature below the liquid crystal transition point of the polymer.
Claims2
A liquid crystal display comprising:
- a liquid crystal cell including a pair of bases having electrodes and a liquid crystal layer sandwiched in between said bases and having a positive dielectric anisotropy, said liquid crystal layer being twist-oriented substantially horizontally in the absence of voltage and with a spiral axis facing perpendicularly to the bases;
- polarizers disposed outside said bases;
- and
- a compensator disposed between said liquid crystal cell and one of said polarizers, said compensator containing as a main constituent a film of a homogeneously orientated liquid crystalline polymer which exhibits a nematic phase in the state of liquid crystal and assumes a glassy state at a temperature below the liquid crystal transition point of the polymer.
1 more element
Dependencies are inferred from the claim text.