Projection type liquid crystal display unit including orthogonal

Details Projection type liquid crystal display unit including orthogonal Projection type liquid crystal display unit including orthogonal

1990-03-23

1992-10-20

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

353 31, 353 34, 359 73, G03G 2100, G03G 2126

Patent

active

051575230

ABSTRACT:
A projection type liquid crystal display unit has dichroic mirrors capable of dividing a light from a light source into R, G and B components which are guided along respective light paths. Each of at least two of these light paths in provided with an optical system which includes a pair of polarizing plates, a twist nematic liquid crystal and at least one phase plate. The angles of the retardation phase axis of the phase plate and light-interruption axes of the polarizing plates or, alternatively, the retardation of the phase plate is determined so as to improve the light-interruption of the liquid crystal panel in light-interruption mode, thereby enhancing contrast of the display image.

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