Power saving drive circuit for tfel devices

Details Power saving drive circuit for tfel devices Power saving drive circuit for tfel devices

G - Physics

09

G

375/47

G09G 3/00 (2006.01) G09G 3/30 (2006.01) H05B 33/08 (2006.01)

Patent

CA 2022971

55,423 ABSTRACT OF THE DISCLOSURE A power saving voltage drive circuit for a TFEL edge emitter device of the type having a plurality of pixels, with each pixel having a first terminal and all pixels on a device sharing a common second terminal, is comprised of a demultiplexing channel driver being selectively connected to the second terminal. A bidirectional switch selectively connects one of the first terminals to a source of voltage thereby enabling current to flow into and out of the pixel. A transformer has a primary winding connected between the first terminal and the bidirectional switch for enabling the pixel to charge to an operating voltage, and a secondary winding connected in series with a diode across the source voltage and ground for limiting the value of that operating voltage. The bidirectional switch is operated so that a substantial portion of the energy used to charge the pixel is returned to the source of voltage at the end of the pulse duration.

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