Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1997-05-13
1999-12-14
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359453, 359455, 359456, 359457, 359452, G02B 532, G03B 2160
Patent
active
06002500&
ABSTRACT:
A holographic screen of a rear projection type for use in a projector for transmitting projection light received from a rear end of the projector onto a viewing surface. The holographic screen includes a holographic sheet including a viewing surface for forming the received projection light into an image viewing, a plurality of diffusion protrusions disposed on the viewing surface in predetermined intervals along horizontal and vertical directions of the viewing surface for diffusing incident projection light, and a plurality of scattering protrusions formed over the entire viewing surface for scattering the received projection light, and a plurality of light absorbers formed between the plurality of protrusions, for absorbing ambient light incident to the viewing surface. Thus, an image with improved contrast is displayed on a viewing surface of the holographic screen.
REFERENCES:
patent: 4960314 (1990-10-01), Smith et al.
patent: 4979801 (1990-12-01), Park
patent: 5365354 (1994-11-01), Jannson et al.
patent: 5473454 (1995-12-01), Blanchard
patent: 5513037 (1996-04-01), Yoshida et al.
patent: 5615045 (1997-03-01), Takuma et al.
Chang Audrey
Samsung Electronics Co,. Ltd.
Spyrou Cassandra
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