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Title:
LIQUID CRYSTAL DISPLAY DEVICE AND RETARDATION FOIL
Document Type and Number:
WIPO Patent Application WO1996006379
Kind Code:
A3
Abstract:
In a liquid crystal display device the number of grey levels is increased by means of a compensation foil comprising a layer having a cholesteric ordering with a helix pattern, in which the pitch of the helix is smaller than (0.26-0.31. DELTA n) mu m, in which DELTA n is the optical anisotropy of the anisotropic layer. Moreover, the viewing angle dependence will be more symmetrical by patterning the cholesteric ordering.

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Inventors:
VAN HAAREN JOHANNES ALBERTUS M
BROER DIRK JAN
LEENHOUTS FRANS
Application Number:
PCT/IB1995/000640
Publication Date:
May 02, 1996
Filing Date:
August 14, 1995
Export Citation:
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Assignee:
PHILIPS ELECTRONICS NV (NL)
PHILIPS NORDEN AB (NL)
International Classes:
G02F1/1335; G02F1/13363; (IPC1-7): G02F1/1335
Foreign References:
EP0576931A21994-01-05
US5243451A1993-09-07
US5241408A1993-08-31
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