CA2107862A1 - Large-Screen Display System - Google Patents

Large-Screen Display System

Info

Publication number
CA2107862A1
CA2107862A1 CA2107862A CA2107862A CA2107862A1 CA 2107862 A1 CA2107862 A1 CA 2107862A1 CA 2107862 A CA2107862 A CA 2107862A CA 2107862 A CA2107862 A CA 2107862A CA 2107862 A1 CA2107862 A1 CA 2107862A1
Authority
CA
Canada
Prior art keywords
image
concave mirror
video
mirror
user
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2107862A
Other languages
French (fr)
Other versions
CA2107862C (en
Inventor
Richard H. Janow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2107862A1 publication Critical patent/CA2107862A1/en
Application granted granted Critical
Publication of CA2107862C publication Critical patent/CA2107862C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7408—Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display

Abstract

A folded, magnifying, front projection arrangement for video displays includes a video image source, such as a flat panel display unit out of the user's field of view, projects its image onto a concave mirror also out of the user's field of view.
The video image source is maintained off-axis with respect to the optic axis of the concave mirror and at a distance from the concave mirror between one and two times the distance from the concave mirror to its principal focal surface, which would be the principal focal plane if the concave mirror were a spherical or a parabolic mirror.
The concave mirror, in turn, reflects and focuses the light from the video image source onto a projection screen, within the user's field of view, resulting in a magnified image. The distortion of the projected image that would otherwise result from off axis projection is compensated for by maintaining the plane of the video image source at a non-perpendicular angle to the optic axis of the mirror. As a result, the image formed on the projection screen is undistorted and in focus across its full width and breadth. Since the projection screen is not an active element, a small aperture, or hole, can easily be cut through it so that a video camera, for capturing the image of the viewer of the screen, may be positioned behind it.
The image resulting from such camera placement provides good eye contact to a remote party viewing the image.
CA002107862A 1992-12-22 1993-10-06 Large-screen display system Expired - Fee Related CA2107862C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US995,425 1992-12-22
US07/995,425 US5394198A (en) 1992-12-22 1992-12-22 Large-screen display system

Publications (2)

Publication Number Publication Date
CA2107862A1 true CA2107862A1 (en) 1994-06-23
CA2107862C CA2107862C (en) 1999-09-28

Family

ID=25541771

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002107862A Expired - Fee Related CA2107862C (en) 1992-12-22 1993-10-06 Large-screen display system

Country Status (2)

Country Link
US (1) US5394198A (en)
CA (1) CA2107862C (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5572248A (en) * 1994-09-19 1996-11-05 Teleport Corporation Teleconferencing method and system for providing face-to-face, non-animated teleconference environment
US5762413A (en) * 1996-01-29 1998-06-09 Alternate Realities Corporation Tiltable hemispherical optical projection systems and methods having constant angular separation of projected pixels
US6231189B1 (en) 1996-01-29 2001-05-15 Elumens Corporation Dual polarization optical projection systems and methods
US5975703A (en) 1996-09-30 1999-11-02 Digital Optics International Image projection system
US5864431A (en) * 1997-07-07 1999-01-26 Redifun Stimulation, Inc. Method and apparatus for elimination of distortion in rear projection to curved surfaces
US6445407B1 (en) * 1998-12-07 2002-09-03 Donald Edward Wright 3-dimensional visual system
US20020175990A1 (en) * 1999-03-31 2002-11-28 Jacquelyn Annette Martino Mirror based interface for computer vision applications
US6530667B1 (en) 2000-02-08 2003-03-11 Elumens Corporation Optical projection system including projection dome
US6554433B1 (en) * 2000-06-30 2003-04-29 Intel Corporation Office workspace having a multi-surface projection and a multi-camera system
US7714943B2 (en) * 2002-06-12 2010-05-11 Geo Semiconductor Inc. Ultra-thin image projection system
DE60321170D1 (en) * 2002-06-12 2008-07-03 Silicon Optix Inc Short-range image projection system and method
US20070165192A1 (en) * 2006-01-13 2007-07-19 Silicon Optix Inc. Reduced field angle projection display system
JP2004113655A (en) * 2002-09-27 2004-04-15 Nec Viewtechnology Ltd Desk with large screen display function
US6882358B1 (en) * 2002-10-02 2005-04-19 Terabeam Corporation Apparatus, system and method for enabling eye-to-eye contact in video conferences
WO2004064370A2 (en) * 2003-01-08 2004-07-29 Silicon Optix Inc. Image projection system and method
US6888562B2 (en) * 2003-03-26 2005-05-03 Broadcom Corporation Integral eye-path alignment on telephony and computer video devices using a pinhole image sensing device
US8299979B2 (en) * 2003-05-14 2012-10-30 Broadcom Corporation Integral eye-path alignment on telephony and computer video devices using two or more image sensing devices
US7766483B2 (en) * 2005-04-06 2010-08-03 Suresh Balu Optical projection system and methods for configuring the same
US7209577B2 (en) * 2005-07-14 2007-04-24 Logitech Europe S.A. Facial feature-localized and global real-time video morphing
US20070230794A1 (en) * 2006-04-04 2007-10-04 Logitech Europe S.A. Real-time automatic facial feature replacement
JP2009080144A (en) * 2007-09-25 2009-04-16 Toshiba Corp Stereoscopic image display apparatus and stereoscopic image display method
US8721149B2 (en) 2008-01-30 2014-05-13 Qualcomm Mems Technologies, Inc. Illumination device having a tapered light guide
JP2011512006A (en) 2008-01-30 2011-04-14 デジタル オプティクス インターナショナル，リミティド ライアビリティ カンパニー Thin lighting system
US8042948B2 (en) * 2008-09-18 2011-10-25 Disney Enterprises, Inc. Apparatus that produces a three-dimensional image
US8029140B2 (en) 2008-09-18 2011-10-04 Disney Enterprises, Inc. Device to produce a floating image

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4167311A (en) * 1978-04-12 1979-09-11 Mcdonnell Douglas Corporation Projection system and process
JPS56119586A (en) * 1980-02-25 1981-09-19 Suzuyo Tanigaki Picture display and image pickup device
JPS56152452U (en) * 1980-04-14 1981-11-14
FR2621198B1 (en) * 1987-09-25 1993-07-30 Guichard Jacques VISUAL AND SOUND COMMUNICATION TERMINAL, ESPECIALLY VISIOPHONE, WITH ARTICULATED HOUSING
JPH0228893A (en) * 1988-07-19 1990-01-30 Sanyo Electric Co Ltd Graphic drawing processor
US4890314A (en) * 1988-08-26 1989-12-26 Bell Communications Research, Inc. Teleconference facility with high resolution video display
JPH039686A (en) * 1989-06-07 1991-01-17 Asahi Optical Co Ltd Picture display device possible to be image picked-up
US5162897A (en) * 1989-08-02 1992-11-10 Hitachi, Ltd. Projection type stereoscopic image display system
US5117285A (en) * 1991-01-15 1992-05-26 Bell Communications Research Eye contact apparatus for video conferencing
US5157503A (en) * 1991-07-16 1992-10-20 Hughes Aircraft Company Near-infinity image display system

Also Published As

Publication number Publication date
CA2107862C (en) 1999-09-28
US5394198A (en) 1995-02-28

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