发明名称 |
ILLUMINATION SYSTEM, LINEAR POLARIZER FOR SUCH AN ILLUMINATION SYSTEM AND A DISPLAY DEVICE COMPRISING SUCH AN ILLUMINATION SYSTEM |
摘要 |
An illumination system comprises a radiation source and a broadband, cholesteric polarizer. Such a polarizer includes a layer of a polymeric material having a cholesteric ordering, the material being ordered such that the axis of the molecular helix is oriented transversely to the layer. The broadband character of the polarizer is obtained by increasing the pitch of the molecular helix from a minimum value at a first surface of the cholesteric layer to a maximum value at the second surface of the layer. The polarizer must be positioned in the illumination system in such a manner that the second surface of the cholesteric layer faces the radiation source. By virtue thereof, the illumination system attains a surprisingly low viewing-angle dependence of the brightness and the colour. This property is further improved by using a quarter lambda plate having a negative an isotropy in the refractive index. |
申请公布号 |
WO9602016(A3) |
申请公布日期 |
1996.02.29 |
申请号 |
WO1995IB00528 |
申请日期 |
1995.06.29 |
申请人 |
PHILIPS ELECTRONICS N.V.;PHILIPS NORDEN AB |
发明人 |
VAN HAAREN, JOHANNES, ALBERTUS, MATTHIJS, MARIA;BROER, DIRK, JAN |
分类号 |
G02F1/1335;G02B5/30;G02F1/13357 |
主分类号 |
G02F1/1335 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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