Browse Prior Art Database

Multicolor Display

IP.com Disclosure Number: IPCOM000078517D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+2]

Abstract

There is disclosed a liquid crystal display device that has multicolor display capability. The device is depicted in the figure.

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Multicolor Display

There is disclosed a liquid crystal display device that has multicolor display capability. The device is depicted in the figure.

Referring to the figure, there is shown a transparent support 10 which is coated on its inner side with a transparent electrode 12.

A transparent support member 14 similar in nature to that of support 10 and coated with a transparent electrode 16 similar to transparent electrode 12, is spaced from support 10 and transparent electrode 12 by a suitable spacer 18. Spaced from transparent support 14 by a suitable spacer 20 is a transparent rigid support member 22, and spaced from transparent rigid support member 22 by a suitable spacer 24 is a similar transparent rigid support member 26. The regions respectively designated by the numerals (1), (2) and (3) are filled with liquid crystalline material in the following manner: Region (1) (C lambda(1)R) A cholesteric material with a pitch yielding a transmission band for right circularly polarized light of wavelength lambda(1).

Region (2) (C lambda(2) L) A cholesteric material with a pitch yielding a transmission band for left circularly polarized light of wavelength lambda(2).

Region (3) (NPA) A nematic material with positive dielectric anisotropy.

Spaced from transparent support member 10 is a suitable polarizer 28.

In considering the operation of the device, it is to be realized that a cholesteric liquid reflects circularly polarized light when the light is in resonance wit...