Liquid crystal display polarizing beam splitter with specific in

Details Liquid crystal display polarizing beam splitter with specific in Liquid crystal display polarizing beam splitter with specific in

1997-09-03

2000-07-25

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 8, 349 5, 359494, 359495, G02F 11335, G02B 530

Patent

active

060942401

ABSTRACT:
In a polarizing beam converter, a uniaxial anisotropic transparent medium is inserted and supported between isotropic transparent media; and an optical axis of said uniaxial anisotropic transparent medium is arranged almost perpendicular to an incident light beam or an incident face of the incident light beam at an interface between the isotropic transparent medium and the uniaxial anisotropic transparent medium. A half wavelength plate is placed with an inclined angle of 45.degree. relative to a polarization axis for either of a reflected light component or a transmitted light component at the interface. The retractive index of the isotropic medium, n.sub.p, and a refraction index n.sub.e greater than n.sub.0, of the uniaxial anisotropic transparent medium are substantially equal to one another. Further, at the interface of the isotropic medium and the uniaxial anisotropic transparent medium, an incident angle satisfying sin(.theta.).gtoreq.n.sub.0
.sub.p for satisfying a total reflection angle.

REFERENCES:
patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 5217794 (1993-06-01), Schrenk
patent: 5347380 (1994-09-01), Lehureau
patent: 5555186 (1996-09-01), Shioya
patent: 5729306 (1998-03-01), Miyake et al.
patent: 5748369 (1998-05-01), Yokota
patent: 5867316 (1999-02-01), Carlson et al.
patent: 5898521 (1999-04-01), Okada

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