Cholesteric liquid crystal layer, optical element, lighting devi

Details Cholesteric liquid crystal layer, optical element, lighting devi Cholesteric liquid crystal layer, optical element, lighting devi

1999-02-02

2000-07-11

Parker, Kenneth

Liquid crystal cells, elements and systems

Cell containing liquid crystal of specific composition

In cholesteric phase

349175, C09K 1902

Patent

active

060880791

ABSTRACT:
A cholesteric liquid crystal layer which is inhibited from appearing to be colored when viewed from slant directions and thus has excellent viewing angle characteristics, while enabling an improvement in the brightness of liquid crystal displays, etc.; and an optical element and an lighting device with each of which liquid crystal displays and the like excellent in brightness and perceptibility can be fabricated. The cholesteric liquid crystal layer (1) has a helical pitch changing in the thickness direction and shows circular dichroism over a wavelength region having a width of at least 50 nm and including a wavelength of 550 nm, wherein the linearly polarized light obtained through a quarter-wavelength plate has a maximum degree of polarization at a wavelength not shorter than 550 nm, or the degree of polarization thereof in a wavelength region on the longer-wavelength side of 550 nm is higher than that in a wavelength region on the shorter-wavelength side of 550 nm. The optical element comprises a multilayer structure composed of the cholesteric liquid crystal layer and at least one optical layer superposed thereon which is a retardation compensating plate, a polarizing plate, a light conductive plate, or a quarter-wavelength plate having an Nz of -1.2 or larger and disposed on the longer-helical-pitch side of the liquid crystal layer. The lighting device or liquid crystal display comprises the cholesteric liquid crystal layer or optical element disposed on one side of a surface light source or liquid crystal cell.

REFERENCES:
patent: 5245456 (1993-09-01), Yoshimi et al.
patent: 5375006 (1994-12-01), Haas
patent: 5506704 (1996-04-01), Broer et al.
patent: 5825444 (1998-10-01), Broer et al.

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