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Title:
ELECTROLUMINESCENT DEVICE
Document Type and Number:
WIPO Patent Application WO2003103068
Kind Code:
A3
Abstract:
An electroluminescent device (13), such as a light emitting diode, which has a light-reflecting surface (10) causing undesirable reflection of ambient light incident on the device is provided with a combination of a reflective circular polarizer (17) and an absorbing circular polarizer (23) to suppress the undesirable reflection of ambient light thus improving the contrast of the device when used under high intensity ambient lighting conditions while maintaining a satisfactory brightness. The reflection band of the reflective circular polarizer regions (17') of the reflective circular polarizer (17) are preferably tuned to the corresponding emission band of the luminescent regions (9') of the electroluminescent device to further increase the contrast of the device while substantially maintaining the same brightness.

Inventors:
BROER DIRK J (NL)
VAN TONGEREN HENRICUS F J J (NL)
VISSER ROBERT J (US)
Application Number:
IB0302156W
Publication Date:
July 22, 2004
Filing Date:
May 20, 2003
Export Citation:
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Assignee:
KONINKLIJKE PHILIPS ELECTRONICS N.V.
BROER, DIRK, J.
VAN TONGEREN, HENRICUS, F., J., J.
VISSER, ROBERT, J.
International Classes:
H05B33/02; G02B5/30; G02F1/13357; H01L51/50; H01L51/52; H01L27/32; (IPC1-7): H01L51/20; G02B5/30; G02F1/3357
Domestic Patent References:
WO2000065385A12000-11-02
Foreign References:
US5928801A1999-07-27
US6379758B12002-04-30
EP0982605A12000-03-01
EP1223618A22002-07-17
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