Browse Prior Art Database

GRID MAPPED CRT FOR DISTORTIONLESS DISPLAY

IP.com Disclosure Number: IPCOM000024515D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

Since most of the state of the art cathode ray tubes exhibit display distortion, these devices are not well suited for reprographics. Further, these devices do not easily support flat screen or other shaped screens. This distortion impedes efficient narrow band data transmission. That is, a tube with picture elements which could otherwise be permanently stored for respective transmission once, then modified by minor frame subelement change, cannot be implemented.

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XEROX DISCLOSURE JOURNAL

GRID MAPPED CRT FOR DISTORTIONLESS DISPLAY U.S. Cl. 313/364 James H. Lindwedel

Proposed Classification

Int. Cl. HOlj 29/00

Since most of the state of the art cathode ray tubes exhibit display distortion, these devices are not well suited for reprographics. Further, these devices do not easily support flat screen or other shaped screens. This distortion impedes efficient narrow band data transmission. That is, a tube with picture elements which could otherwise be permanently stored for respective transmission once, then modified by minor frame subelement change, cannot be implemented.

An article in EDN, April 20, 1979, page 63, et seq., disclosed a single beam CRT utilizing sets of four vertical phosphor stripes, including red, green, blue and an ultraviolet emitting stripe. The present invention, however, discloses a CRT having an X - Y grid map with secondary energy emission. The secondary emission can be used to digitally indicate the CRT electron beam position using external counting circuits. Because photolithographic means can be used to print controlled position blocks of video emission elements, the electron beam can be raster scanned to produce an image with very little distortion. Color and gray scales can be supported with importantly increased resolution. One implementation includes an X - Y grid CRT with 2 different (horizontal and vertical) secondary emission elements. Such a CRT should be capable of generating at least 300 l...