Patent EP0454244A2 successfully refreshed from Google Patents.
EP0454244A2
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EP
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Image display and pick-up apparatus
Assignee: Koninklijke Philips NV
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Filing: 1991-04-22
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Granted: —
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Expires: 2011-04-22
Abstract
Abstract In an image display and pick-up apparatus comprising a display screen (21) with controllable transmissivity, an image projection device (12) disposed behind the screen for projecting on the screen and an image pick-up device (13) disposed behind the screen for taking pictures through the screen of a subject (14) located before the screen, a controllable optical shutter (22) is provided for preventing light from the projection device (12) to reach, via the screen, the image pick-up device (13).
Inventors
- 👤 Yasuhi Tanigaki
- 👤 Yoshikazu Satoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:12
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/14; H04N7/141; H04N7/142; H04N7/144
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
An image display and pick-up apparatus comprising a screen with controllable transmissivity, an image projecting device disposed behind the screen for producing signal light containing information of a picture and for supplying the light to a back surface of the screen to thereby display the picture on the screen, and an image pick-up device disposed behind the screen for taking pictures through the screen of a subject located in front of the screen, characterized by a controllable optical shutter for preventing the signal light from reaching the screen when the subject is to be picked up by the image pick-up device.
Claim 2
Dependent Claim
25 words
An image display and pick-up apparatus according to claim 1, characterized in that said shutter comprises any one of liquid crystal, EC and electro-conductive polymer.
Claim 3
Dependent Claim
76 words
An image display and pick-up apparatus according to claim 1 or claim 2, characterized in that the image projecting device comprises in this order a light source, a transmission-type display element for being driven by a video signal and a projection lens for projecting the light of said light source passed through the screen onto the rear surface of the screen, and in that said shutter is disposed between said display element and said projection lens.
References Cited (Backward Citations)
No citation records indexed.
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