Method for manufacturing a broadband cholesteric polarizer

Details Method for manufacturing a broadband cholesteric polarizer Method for manufacturing a broadband cholesteric polarizer

1997-08-14

1999-09-07

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

2522997, 252585, 359 63, 359 65, 359105, 359500, G02B 530, G02F 11335, C09K 1936

Patent

active

059488310

ABSTRACT:
A liquid-crystalline cholesterically ordered layer comprising reactive chiral monomers and reactive nematogenic monomers having a different reactivity is polymerized by exposure to radiation. The intensity of the radiation is increased substantially, preferably by a factor of 10 or more, when a desired edge position of the band is reached. As a result, the bandwidth and edge position of the reflection band reached at that moment are frozen as it were. A monochromatic sensor can be used to determine whether said edge position has been reached, the wavelength used by the sensor corresponding to the wavelength of the desired edge position of the band. Broadband, cholesteric polarizers having a well-defined bandwidth and edge position can very advantageously be used in a display.

REFERENCES:
patent: 5188760 (1993-02-01), Hikmet et al.
patent: 5506704 (1996-04-01), Broer et al.
patent: 5721603 (1998-02-01), De Vaan et al.
patent: 5737044 (1998-04-01), Van Haaren et al.
patent: 5825444 (1998-10-01), Broer et al.

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