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US Patent 7973491 Multi-lamp backlight apparatus

Patent 7973491 was granted and assigned to Darfon Electronics Corp. on July, 2011 by the United States Patent and Trademark Office.

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Patent attributes

Current Assignee
‌
Darfon Electronics Corp.
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7973491
Date of Patent
July 5, 2011
Patent Application Number
12263744
Date Filed
November 3, 2008
Patent Primary Examiner
‌
Shawki S Ismail
Patent abstract

A multi-lamp backlight apparatus is disclosed. The multi-lamp backlight apparatus includes 2N lamps, N balancing transformers, and a high-voltage power source. N is a positive integer and k is an integer index ranging from 1 to N. The kth balancing transformer among the N balancing transformers includes a first primary winding, a second primary winding, and a secondary winding. The first primary winding connects in series with the (2k−1)th lamp of the 2N lamps. The second primary winding connects in series with the first primary winding and the (2k)th lamp. The secondary winding corresponds to the first primary winding and the second primary winding. The high-voltage power source is connected between the first primary windings and the second primary windings.

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