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US 4,906,073 AGranted
Liquid crystal display device using nematic liquid crystal having twisted helical structure and a phase correction plate
AssigneeHitachi, Ltd.
InventorsKatuyuki Hunahata, Yuji Mori, Jun-ichi Hirakata, Yoshiharu Nagae, Hideaki Kawakami, Kiyoshige Kinugawa, Yasuhiko Kando
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Abstract
In a liquid crystal display device, light transmitting through a liquid crystal layer is colored depending on the structural conditions of the liquid crystal display device. The phase of the transmission light is corrected by means of a phase correction plate to make the transmission light approximate achromatic color, thereby permitting monochromatic display or color display.
Claims12
A liquid crystal display device comprising:
- a liquid crystal layer of the twist nematic type having a twist angle which exceeds 90.degree., said layer being interposed between a plurality of electrodes which are opposed to each other;
- a pair of polarizer plates so disposed as to sandwich said liquid crystal layer;
- and
- a phase plate means for providing phase correction interposed between said pair of polarized plates, said phase plate means comprising a birefringent organic film having substantially the same characteristic of wavelength dispersion as that of said liquid crystal layer and with a selected optical thickness determined by the optical thickness and twist angle of the liquid crystal layer, said phase plate means being disposed at an angle with respect to a polarization axis or absorption axis of the polarizer plate to cause birefrigence to retard an overall wavelength of visible light.
1 more element
A liquid crystal display device comprising:
- a first liquid crystal layer of the twist nematic type having a twist angle which exceeds 90.degree.,said layer being interposed between a plurality of electrodes which are opposed to each other;
- a pair of polarizer plates so disposed as to sandwich said first liquid crystal layer;
- and
- at least one second liquid crystal layer having a twist angle which is substantially 0.degree. or 180.degree. and interposed between said paired polarizer plates.
1 more element
Dependencies are inferred from the claim text.