Projection type display including a holographic diffuser

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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Details

359837, 359599, 359709, 349 67, 362308, 362328, G02B 532, G02B 502, G02F 11335, F21V 1304

Patent

active

058087591

ABSTRACT:
A light source device including a light emitting element emits a luminous flux, which is converged by a reflecting mirror. A conical light-refracting element receives the luminous flux converged by the reflecting mirror and changes the cone angle of the luminous flux. The luminous flux exiting the conical light-refracting element is diffused by a holographic diffuser and is then converged by at least one lens. The reflecting mirror may have an elliptic curvature or a parabolic curvature. The light source device is also used to form a projector for a projection type display apparatus. In the projector, the luminous flux emitted from the light source device may be separated by color separators into a plurality of colors of light. Then, each color of light is directed to the corresponding one of a plurality of light valves. Then, a color synthesizer synthesizes the colors of light emitted from the light valves into a composite image which in turn is projected onto a screen. A plurality of such projectors are used to construct a multiscreen projection type display system where each of the projectors projects a corresponding image. At least one reflecting mirror for bending a corresponding one of the images is included in the multiscreen projection type display system. The reflecting mirror projects the image onto a screen so that the images emitted from the plurality of projectors are combined into a composite image on the screen.

REFERENCES:
patent: 5471327 (1995-11-01), Tedesco et al.
patent: 5659409 (1997-08-01), Ooi et al.

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