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Patent Searching and Data


Title:
PROJECTION TYPE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/111724
Kind Code:
A1
Abstract:
A projection type display device includes: a light source (21); a spatial light modulation element (25) for modulating the incident light according to the video signal applied and emitting it; an illumination optical system (23) for collecting light from the light source (21) and illuminating the spatial light modulation element (25); a projection lens (27) for projecting the emission light from the spatial light modulation element (25); light shading means (1) arranged for the spatial light modulation element (25) along the light path of the side of the illumination optical system (23) or the projection lens (27) so as to change the light shading amount of the light passing; and video signal correction means (3, 4, 5, 6) for performing correction of the video signal applied to the spatial light modulation element (25) according to the current light shading amount of the light shading means (1) for each of the regions into which the screen of the spatial light modulation element (25) is divided. Thus, it is possible to perform appropriate uniformity correction even when the light angle distribution emitted from the spatial light modulation element and reaching the screen changes.

Inventors:
SATO YOSHIHISA (JP)
Application Number:
PCT/JP2004/008389
Publication Date:
December 23, 2004
Filing Date:
June 09, 2004
Export Citation:
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Assignee:
SONY CORP (JP)
SATO YOSHIHISA (JP)
International Classes:
G03B21/13; G03B37/04; H04N5/202; H04N5/74; H04N9/69; H04N9/68; H04N9/73; (IPC1-7): G03B21/00
Foreign References:
JPH08106090A1996-04-23
JPH11113019A1999-04-23
JP2003107422A2003-04-09
JP2002303931A2002-10-18
JPH07199183A1995-08-04
Other References:
See also references of EP 1531357A4
Attorney, Agent or Firm:
Tsunoda, Yoshisue (8-1 Nishishinjuku 1-chom, Shinjuku-ku Tokyo, JP)
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