Birefringent compensator for reflective polarizers

Details Birefringent compensator for reflective polarizers Birefringent compensator for reflective polarizers

1995-09-28

1998-03-24

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359499, 359 73, G02F 11335

Patent

active

057318867

ABSTRACT:
An optical device for transforming light and an associated liquid crystal display is disclosed. The device includes a layer of cholesteric material of the type which transmits light having a first circular helicity and reflects light having a second circular helicity. A quarter-wave plate positioned on a first side of the layer of cholesteric material converts the transmitted light having the first circular helicity into linearly polarized light. A compensator including a positively birefringent C-plate layer is disposed between the layer of cholesteric material and the quarter-wave plate. The compensator reduces undesirable phase effects in the transmitted light introduced by the layer of cholesteric material. The disclosed LCD employs the optical device to increase backlighting efficiency while improving field of view and chromaticity of the display.

REFERENCES:
patent: 5235443 (1993-08-01), Barnik et al.
patent: 5319478 (1994-06-01), Funfschilling
patent: 5486935 (1996-01-01), Kalmanash
patent: 5506704 (1996-04-01), Broer et al.

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