Browse Prior Art Database

Electromechanical Dot Matrix Display

IP.com Disclosure Number: IPCOM000086719D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Franklin, RE: AUTHOR

Abstract

A low-cost dot-matrix display includes a rotating cylinder having a series of perforations cut therein for rotation past a rapidly switching light-emitting diode to provide a character matrix display.

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Electromechanical Dot Matrix Display

A low-cost dot-matrix display includes a rotating cylinder having a series of perforations cut therein for rotation past a rapidly switching light-emitting diode to provide a character matrix display.

A single light-emitting diode 11 is provided for each character position. Rotating cylinder 13 has a series of perforations 15 cut therein. The perforations are staggered around the cylinder such that only one perforation appears in the viewing area 17 at any one instant of time. A character is displayed by modulating the light-emitting diode 11 so as to construct the columns of a character in a dot-by-dot fashion. As the perforation in the cylinder corresponding to the first column of a character crosses the viewing area 17, the character generator 19 causes the light emitting diode to be turned on or off at various discrete positions of the perforation along its path, thus creating light dots which make up the first column of the character matrix. As the first column perforation is leaving the viewing area 17, the second column perforation is just entering it, and the second column is generated in the same way as the first. Thus, a single light-emitting diode 11 is utilized for each character of the display.

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