Invention Grant
- Patent Title: Rear-surface projection-type video display apparatus
- Patent Title (中): 背面投影式视频显示装置
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Application No.: US13091501Application Date: 2011-04-21
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Publication No.: US08384995B2Publication Date: 2013-02-26
- Inventor: Koji Hirata , Hidehiro Ikeda , Toshihiko Matsuzawa , Tadashi Sato
- Applicant: Koji Hirata , Hidehiro Ikeda , Toshihiko Matsuzawa , Tadashi Sato
- Applicant Address: JP Tokyo
- Assignee: Hitachi Consumer Electronics Co., Ltd.
- Current Assignee: Hitachi Consumer Electronics Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: McDermott Will & Emery LLP
- Priority: JP2010-128391 20100604
- Main IPC: G03B21/60
- IPC: G03B21/60

Abstract:
A rear-type projection board apparatus (rear-surface projection-type video display apparatus), of new structure, having no necessity of a housing, being superior in portability, cheaply producible, comprises a transmission-type screen, being disposed within an interior space, under a condition of exposing both surfaces thereof in the space, and for transmitting a visual light projected onto a rear surface therethrough, so as to display it on a video display surface on a front surface, and a video projection apparatus (projector), being disposed at a predetermined position on a rear surface side of the transmission-type screen, and for projecting the visual light from a rear surface of the transmission-type screen, enlargedly, wherein the transmission-type screen has a Fresnel lens having Fresnel lens surfaces, covering over an entire light receiving surface for receiving the visual light, which is enlargedly projected from the video projection apparatus, whereby guiding the visual light received from the video projection apparatus into a direction perpendicular to the video display surface, while guiding external lights within the interior space downwards.
Public/Granted literature
- US20110298993A1 REAR-SURFACE PROJECTION-TYPE VIDEO DISPLAY APPARATUS Public/Granted day:2011-12-08
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