Browse Prior Art Database

Two-Way Desk-Top Display System

IP.com Disclosure Number: IPCOM000106030D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Goodman, DS: AUTHOR

Abstract

Disclosed is a display device that permits two-way communication between users. A video cameras at each display views its user, whose image can then be transmitted to the other. It is desirable to view the other user head-on to produce the feel of a face-to-face conversation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

Two-Way Desk-Top Display System

      Disclosed is a display device that permits two-way
communication between users.  A video cameras at each display views
its user, whose image can then be transmitted to the other.  It is
desirable to view the other user head-on to produce the feel of a
face-to-face conversation.

      As shown in the Figure, the image is seen on a screen onto
which it is front projected.  Such projection is necessarily oblique,
so keystone distortion results, but this can be compensated by
optical methods or by digitally transforming the image produced by
the primary display device.

      The user of the display device is viewed through the screen.
One method is by holes in the screen that are too small to be
perceived by the user, but large enough for television resolution.
The simplest screen is a flat diffuser with holes.  To improve the
display's brightness, the surface of the screen can be made of tilted
facets that direct the light toward the viewer.  Another type of
screen makes use of wavelength-dependent scattering.  If particles in
the screen are held in a different medium and the refractive indices
of particles and medium vary with wavelength, then the composite
scatters, except at a wavelength where the indices are the same.
(This principle is used in the Christiansen filter.)  If the display
is a color one, with three source spectra, between two of which there
is a spectral window, then the observation can take place in...