Title:
REFLECTIVE LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP3467210
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an achromatic display high in contrast and high in lightness.
SOLUTION: A normally black(NB) mode reflective liquid crystal display device 1 comprises a liquid crystal cell having a supertwisted nematic(STN) liquid crystal layer 9, a first optical retardation plate 4, a second optical retardation plate 3 and a polarizing plate 2 successively arranged on the one surface side of the cell and a reflection layer 15 constituting the other surface of the cell and arranged inside the cell. The product of birefringence and thickness of the liquid crystal layer 9 ΔnLc.dLC, the product of birefringence and thickness of the first optical retardation plate 4 Δn1.d1 and the product of birefringence and thickness of the second optical retardation plate 3 Δn2.d2 are selected within ranges 660 to 830 nm, 120 to 240 nm and 300 to 430 nm respectively. The twist angle χ is selected within 220 to 260° range. Specified angles θ, &phiv and ψ are selected within ranges -130 to -75°, -20 to -60° and -15 to -45° respectively.
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Inventors:
Atsushi Doi
Application Number:
JP15866299A
Publication Date:
November 17, 2003
Filing Date:
June 04, 1999
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G02F1/133; G02F1/1335; G02F1/13363; G02F1/139; (IPC1-7): G02F1/13363; G02F1/133; G02F1/1335
Domestic Patent References:
| JP10161110A | ||||
| JP200098385A | ||||
| JP2000284275A |
Attorney, Agent or Firm:
Keiichiro Saikyo