Projection type image display device maintaining resolution of a

Details Projection type image display device maintaining resolution of a Projection type image display device maintaining resolution of a

1994-05-26

1995-12-12

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 41, 359 42, 359 53, G02F 11335, G02F 1133

Patent

active

054755131

ABSTRACT:
An image display device is arranged to have a liquid crystal light valve, a liquid crystal display panel, a backlighting unit, and a rod lens array. The liquid crystal light valve serves to form an image from the light applied thereto. The liquid crystal display panel serves to form a light pattern to be written to the liquid crystal light valve. The backlighting unit serves to apply light to the panel. The rod lens array is located between the liquid crystal panel and the liquid crystal light valve so that each of the light acceptance angle .theta. (half angle) and the degree of parallelization .alpha. (half angle) of light are not less than tan.sup.-1 {P/(3.sup.1/2.multidot.L)} (P is a pitch and L is a distance between the incident end of light and the pixel of the matrix type liquid crystal display panel) and at least one of the light acceptance angle .theta. (half angle) and the degree of parallelization a of light is 20.degree. or less.

REFERENCES:
patent: 5083854 (1992-01-01), Zampolin et al.
patent: 5329388 (1994-07-01), Yoshimizu
"A 1.9-in. 1-5-MPixel Driver Fully-Integrated Poly-Si TFT-LCD for HDTV Projection", Takafuji et al., Society for Information Display International symposium Digest of Technical Papers vol. XXIV, May 18-20, 1993.

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