Control of electroluminescent displays
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United States of America Patent
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-
Jul 11, 2006
Grant Date -
Jan 13, 2005
app pub date -
Jul 28, 2003
filing date -
Jul 7, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A controller 2 is provided for use with a multi-segment electroluminescent display 1. Control signals C1 C5 control a plurality of half H-bridges H1 H5, the terminals of the half H-bridges being connected respectively to ground 10 and to a high voltage DC supply 9 so that the half H-bridges each provide an AC voltage. One of said half H-bridges provides a common output Vcommon and the remaining H-bridges provide drive voltages V1 V4 for the segments of the display. During each cycle, the controller 2 causes the drive outputs V1 V4 to either be in phase or in anti-phase with the common output Vcommon. This selectively turns the segments on and off at a rate much higher than the human eye can perceive. The brightness of the segments is controlled by varying the proportion of the time that each segment is illuminated.
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