Image display apparatus having particular phase difference

Details Image display apparatus having particular phase difference Image display apparatus having particular phase difference

2007-03-27

2007-03-27

Qi, Mike (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

C349S117000, C349S119000

Reexamination Certificate

active

10922402

ABSTRACT:
An image display apparatus is disclosed which is capable of obtaining a projected image having high contrast. The image display apparatus includes a luminous flux dividing system dividing light from a light source into a plurality of luminous fluxes and a condensing optical system leading the luminous fluxes emerged from the luminous flux dividing system to a reflective liquid crystal display element. The condensing optical system includes a condenser lens, a field lens making light from the condenser lens substantially telecentric, a polarization beam splitter, and a ¼ phase plate disposed between the polarization beam splitter and the liquid crystal display element. In addition, the phase difference φ that the ¼ phase plate gives to the ray made incident into the ¼ phase plate at an angle θ satisfies:in-line-formulae description="In-line Formulae" end="lead"?π/2×0.8<φ<π/2×1.2.in-line-formulae description="In-line Formulae" end="tail"?

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Chinese Office Action of corresponding Chinese Patent Application No. 2004100576099 mailed Nov. 25, 2005 (3 pages) and partial English translation (1 page).

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