Invention Grant
- Patent Title: Light source unit and projection type video display apparatus using the same
- Patent Title (中): 光源单元和使用其的投影型视频显示装置
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Application No.: US11035709Application Date: 2005-01-13
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Publication No.: US07806566B2Publication Date: 2010-10-05
- Inventor: Futoshi Yamasaki , Masahiko Yatsu
- Applicant: Futoshi Yamasaki , Masahiko Yatsu
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Townsend and Townsend and Crew LLP
- Priority: JP2004-008620 20040116
- Main IPC: F21V7/00
- IPC: F21V7/00
Abstract:
In a projection type video display apparatus, in order to assure sufficient brightness by suppressing a decrease in light utilization efficiency inside a limited output aperture area of a light source unit, a transmission or reflection type liquid crystal is used for a video display device and the light source unit having a plurality of reflectors or focusing mirrors in correspondence with LED's representing light sources is so constructed as to satisfy D
Public/Granted literature
- US20050190307A1 Light source unit and projection type video display apparatus using the same Public/Granted day:2005-09-01
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