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Alpha Numeric Displays

IP.com Disclosure Number: IPCOM000078034D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Blum, JM: AUTHOR [+2]

Abstract

A low-cost display is provided having small power consumption, small physical size, and a "latch" capability (i.e., no refresh circuits are required). This display utilizes an array of light-emitting diodes (LED) in combination with a light-sensitive film.

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Alpha Numeric Displays

A low-cost display is provided having small power consumption, small physical size, and a "latch" capability (i.e., no refresh circuits are required). This display utilizes an array of light-emitting diodes (LED) in combination with a light- sensitive film.

A top and side view of the system is shown. A photosensitive film loop comprises, for instance, a photochromic film. The loop is driven by a drive reel 1 in combination with an idler reel 2. An LED array 3 having associated therewith driver circuitry 4 (Fig. 2), is located within the film loop. On the other side of the film is a photodiode 5 (Fig. 2) used for synchronization of the images produced on the film. An erase tube 6 provides illumination to erase the characters produced on the film. The entire apparatus may be contained within a box 7.

Activation of diode array 3 causes printing of a single line segment of a character to be displayed on the film. Movement of the film or of the diode array registers a new area of the film for printing of the next single line segment of the character, etc. In this manner a recorded image of a whole line of characters is established on the film. Movement of the film can be either step-by-step or a continuous linear scan, with the scan rate suitably synchronized with the diode printing rate. If desired, marker pulses may be derived photoelectrically from the film to initiate each single scan of array 3.

Photochromic films require 0.1 nj/mu/2/ writi...