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Multiplexed Driving of Segmented Display

IP.com Disclosure Number: IPCOM000088573D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Shipp, KO: AUTHOR

Abstract

With three binary signal lines, eight combinations of signals can be presented. If these eight combinations are used to drive a numeric display, only eight different digits may be represented, for example, 0 through 7. This technique allows the display of the digits 8 and 9 on a 7-segment numeric display with three binary inputs.

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Multiplexed Driving of Segmented Display

With three binary signal lines, eight combinations of signals can be presented. If these eight combinations are used to drive a numeric display, only eight different digits may be represented, for example, 0 through 7. This technique allows the display of the digits 8 and 9 on a 7-segment numeric display with three binary inputs.

The digits 0 through 7 are represented by unique binary combinations of the three input lines in the conventional manner. To display an 8, the digits 6 and 7 are alternately displayed for equal amounts of time at a high enough speed so that it appears to an observer that the single digit 8 is continuously displayed. Similarly, a 9 is displayed by alternating the display of a 4 and a 7 in the same manner. For a light-emitting diode display, approximately 160 microseconds has been found to be a suitable time period for display of each of the composite digits that comprise the 8 or 9.

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