Illumination system using cholesteric polarizer, linear polarize

Details Illumination system using cholesteric polarizer, linear polarize Illumination system using cholesteric polarizer, linear polarize

1996-11-19

1998-10-20

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 62, 349175, G02F 11335, G02F 113

Patent

active

058254447

ABSTRACT:
The Application relates to an illumination system comprising a fluorescent lamp and a broadband, cholesteric polarizer. Such a polarizer contains a layer of a polymeric material having a cholesteric order, which material is ordered in such a way that the axis of the molecular helix extends at right angles to the layer. The broadband character of the polarizer is obtained by causing the pitch of the molecular helix to increase from a minimum value at a first surface of the cholesteric layer to a maximum value at the second surface of the layer. In accordance with the invention, the polarizer should be positioned in the illumination system in such a manner that the cholesteric layer is directed towards the fluorescent lamp with its first surface. In addition, the value of the product p.sub.max.n.sub.e of the maximum value of the pitch in the cholesteric layer p.sub.max and of the extraordinary refractive index n.sub.e must range between 0.61 micron and 0.76 micron. By virtue of these measures, the illumination system has a surprisingly low viewing-angle dependence of the lightness and the color. The Application further relates to a linear polarizer for use in this illumination system as well as to a display device which comprises such a linear polarizer.

REFERENCES:
patent: 5506704 (1996-04-01), Broer et al.
patent: 5721603 (1998-02-01), De Vaan et al.

Affiliated with

Also associated with

Rating

Illumination system using cholesteric polarizer, linear polarize does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Illumination system using cholesteric polarizer, linear polarize, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Illumination system using cholesteric polarizer, linear polarize will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-250357