Control of electroluminescent displays

Details Control of electroluminescent displays Control of electroluminescent displays

2006-10-10

2006-10-10

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C315S291000, C315S224000, C315S307000, C345S076000, C345S212000, C345S214000

Reexamination Certificate

active

07119493

ABSTRACT:
A controller for use with a multi-segment electroluminescent display1. Control signals C1–CN control a plurality of half H-bridges H and Hc, the terminals of the half H-bridges being connected respectively to ground and to a high voltage DC supply9. One of said half H-bridges provides a common output Vcommon and the remaining H-bridges provide drive voltages V1–VN for the segments of the display. The H bridges are driven by an oscillator14so that an AC voltage is selectively applied to the segments of the display. A power supply24provides a predetermined amount of power per unit area of the display. This is controlled by an area summation engine22having a segment data input, a segment counter and a memory containing area data corresponding to the segment(s) of the display. Based on the input from the segment data input, the area(s) of the segment(s) that are to be lit are obtained from the memory and summed to provide the total area to be lit. This is fed to the power supply24, which then feeds the correct amount of power to display1via the half H-bridges.

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