Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Video System for Displaying "Three Dimensional" Illusion

IP.com Disclosure Number: IPCOM000076197D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Johnson, RB: AUTHOR [+3]

Abstract

This arrangement provides an optional "three-dimensional" display with a videotext learning system (VLS) display cathode-ray tube (CRT). The CRT is equipped with two electron guns 11 & 12, a shadow mask 14, and a face plate member having a conventional monochrome phosphor screen 16 deposited thereon. The electron beams impinge on the shadow mask 14, which has a number of apertures therein in the form of narrow vertical slits. Thus only parts of each electron beam will pass through the apertures exciting the phosphor. From the two electron guns there will be excited phosphor dots side-by-side filling the raster. A viewing mask 20 is arranged before the face plate member.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 76% of the total text.

Page 1 of 2

Video System for Displaying "Three Dimensional" Illusion

This arrangement provides an optional "three-dimensional" display with a videotext learning system (VLS) display cathode-ray tube (CRT). The CRT is equipped with two electron guns 11 & 12, a shadow mask 14, and a face plate member having a conventional monochrome phosphor screen 16 deposited thereon. The electron beams impinge on the shadow mask 14, which has a number of apertures therein in the form of narrow vertical slits. Thus only parts of each electron beam will pass through the apertures exciting the phosphor. From the two electron guns there will be excited phosphor dots side-by-side filling the raster. A viewing mask 20 is arranged before the face plate member. With the viewer standing in the proper location, one eye 21 will see the output of one electron gun 11 and the other eye 22 the output of the other electron gun 12. When the signals on the electron guns 11 and 12 are those originally developed by a camera system of the stereopticon variety, the viewer will accept the illusion of a three-dimensional picture.

Two different types of face plates are contemplated. A more-or-less conventional glass face plate with either opaque slits arranged as part of the face plate, or one with two pieces of glass with etched opaque and clear slits fused (or fastened by some other means) together providing the proper spacing.

A less conventional fiber-optic face plate 30, as shown, is preferred. The advantage o...