Control of electroluminescent displays

Details Control of electroluminescent displays Control of electroluminescent displays

2006-07-11

2006-07-11

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C345S076000

Reexamination Certificate

active

07075240

ABSTRACT:
A controller2is provided for use with a multi-segment electroluminescent display1. Control signals C1–C5control a plurality of half H-bridges H1–H5, the terminals of the half H-bridges being connected respectively to ground10and to a high voltage DC supply9so 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–V4for the segments of the display. During each cycle, the controller2causes the drive outputs V1–V4to 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.

REFERENCES:
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patent: 4782269 (1988-11-01), Haferl
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patent: 5745085 (1998-04-01), Tomio et al.
patent: 6215462 (2001-04-01), Yamada et al.
patent: 6541921 (2003-04-01), Luciano et al.
patent: 0817536 (1998-01-01), None
patent: WO 2004/015669 (2004-02-01), None

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