Title:
投写型表示装置
Document Type and Number:
Japanese Patent JP4990416
Kind Code:
B2
Abstract:
A projection display device has an illumination optical system that includes a light-intensity equalization element, a first optical system, and an aperture regulation member. The aperture regulation member is disposed at a position that is not optically conjugate with the screen, and the aperture regulation member has at least one of the following, using measured or calculated relative illuminances at each of multiple segments of the image formation region or screen: an aperture expansion part provided at a position corresponding to a segment with a low relative illuminance, the aperture expansion part being a cutout that narrows the light-blocking section and widens the aperture section; an aperture contraction part provided at a position corresponding to a segment with a high relative illuminance, the aperture contraction part being a protrusion that widens the light-blocking section and narrows the aperture section.
Inventors:
Kuniko Kojima
Hayato Takeuchi
Asahi Yamada
Hayato Takeuchi
Asahi Yamada
Application Number:
JP2011551730A
Publication Date:
August 01, 2012
Filing Date:
August 18, 2011
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G03B21/14; G02B5/00; G02B19/00
Domestic Patent References:
| JP2006085054A | 2006-03-30 | |||
| JP2006086788A | 2006-03-30 | |||
| JPS63316802A | 1988-12-26 | |||
| JP2003322822A | 2003-11-14 | |||
| JP2005134522A | 2005-05-26 | |||
| JPH02216983A | 1990-08-29 | |||
| JP2002156703A | 2002-05-31 |
Foreign References:
| WO2002088841A1 | 2002-11-07 |
Attorney, Agent or Firm:
Minoru Maeda
Youichi Yamagata
Masahiko Shinohara
Youichi Yamagata
Masahiko Shinohara