Invention Grant
- Patent Title: Image display device and Fresnel lens sheet used therefor
- Patent Title (中): 图像显示装置和用于其的菲涅尔透镜片
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Application No.: US11474150Application Date: 2006-06-22
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Publication No.: US07675679B2Publication Date: 2010-03-09
- Inventor: Hiroki Yoshikawa , Takanori Hisada , Tetsu Ohishi , Koji Hirata , Daisuke Imafuku
- Applicant: Hiroki Yoshikawa , Takanori Hisada , Tetsu Ohishi , Koji Hirata , Daisuke Imafuku
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Townsend and Townsend and Crew LLP
- Priority: JP2005-369013 20051222; JP2006-058851 20060306
- Main IPC: G03B21/60
- IPC: G03B21/60
Abstract:
A Fresnel lens sheet used for an image display device is disclosed. The Fresnel lens sheet is provided with a first prism group in an area of a light entrance plane of the Fresnel lens sheet where the incident angle of light is equal to or more than a predetermined incident angle and a second prism group in an area of a light entrance plane of the Fresnel lens sheet where the incident angle of light is less than the predetermined value.
Public/Granted literature
- US20070146879A1 Image display device and Fresnel lens sheet used therefor Public/Granted day:2007-06-28
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