Image projection system

Details Image projection system Image projection system

1991-09-16

1992-11-17

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358232, H04N 931

Patent

active

051648210

ABSTRACT:
A projection system comprises a light source, a dichroic mirror for separating white light into blue, green and red color light beams, a halfwave plate for converting the direction of polarization, three light valves for forming optical images depending on a picture signal, and three projection lenses for projecting the optical images on the light valves onto a screen. By using the halfwave plate, the color light of p-polarized light component or s-polarized light component emitted from the dichroic mirror is entered into the liquid crystal panel. The gradient width of the spectral distribution of the color light entering the liquid crystal panel is smaller, and the color nonuniformity of projected image by changes of spectral transmittance characteristic of the dichroic mirror with respect to the incident angle is reduced.

REFERENCES:
patent: 4989076 (1991-01-01), Owada
Institute of Television Engineers of Japan Technical Report, CE '89-17, pp. 55-60.

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