Browse Prior Art Database

Character Display System

IP.com Disclosure Number: IPCOM000086716D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Liebschutz, LC: AUTHOR [+2]

Abstract

A character display includes a linear set of light sources which are selectively illuminated in timed relation to a rotating scanner cylinder to provide an inexpensive character display.

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Character Display System

A character display includes a linear set of light sources which are selectively illuminated in timed relation to a rotating scanner cylinder to provide an inexpensive character display.

The character display unit (Fig. 1) includes a linear set of light-emitting diodes 11, one for each vertical character picture element, a rotating scanner cylinder 13, a drive system 15 and a character generator 17 which energizes the light- emitting diodes in proper sequence. The display output which is the cylinder 13 viewed edge-on is formed by the combination of light-emitting diode excitation and cylinder rotation. The scanner cylinder 13 includes a vertical stack of radially imbedded optical fibers 19 (Fig. 2) for conducting light from the light-emitting diodes to the periphery of the cylinder.

Thus, as the cylinder spins, an energized light-emitting diode will appear as a scan line of light to a viewer looking at the edge of the cylinder. Pulsing the light source results in control over the corresponding picture element. The stationary light-emitting diodes are pulsed by character generator 17 which is responsive to the shaft-position indicator 21 and a character input.

Fig. 3 shows a further version where multiple display lines are made possible by inserting the optical paths at an angle. Here, one set of fibers sweeps out one line and another set sweeps out the other line. Line displacement is the result of the displacement of fibers at the cylin...