Browse Prior Art Database

Time Multiplexed Single Position display

IP.com Disclosure Number: IPCOM000080058D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Beckley, OE: AUTHOR [+3]

Abstract

Described is a technique and circuit arrangement for sequentially displaying on a single light-emitting diode (LED) display a number of characters. The LED is blanked between characters in a sequence and a longer blanking period is utilized between sequences of characters. This technique permits a reduction in both cost and size of displays, and is useful in many different applications.

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Time Multiplexed Single Position display

Described is a technique and circuit arrangement for sequentially displaying on a single light-emitting diode (LED) display a number of characters. The LED is blanked between characters in a sequence and a longer blanking period is utilized between sequences of characters. This technique permits a reduction in both cost and size of displays, and is useful in many different applications.

The block diagram shows the basic elements required for displaying in sequence four characters. Input data from an I/O bus is gated into one of four character registers via input gates, under the control of an I/O control section. An external clock, in the range of 15 Hz, drives the scanner which generates gating control signals which are applied to the output gating circuits. In addition, the scanner generates blanking signals which are applied to the LED module. The blanking control signals and the gating control signals are graphically illustrated. The blanking control signals turn the LED off for short periods (100 ma) between the four sequential characters, and for a longer period (700 ms) between sequences of characters.

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