Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Reexamination Certificate
2007-04-17
2007-04-17
Vu, Jimmy (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
C315S291000, C315S307000
Reexamination Certificate
active
11258899
ABSTRACT:
There are provided a discharge lamp drive apparatus which can detect that both ends of at least one of a plurality of discharge lamps is in an open state in a differential drive scheme, and a liquid crystal display apparatus. A first current detection circuit31detects a current flowing through a first discharge lamp connection terminal group P1or a current flowing through a second discharge lamp connection terminal group P3, and generates a first current detection signal S1. A second current detection circuit32detects a current flowing through the second discharge lamp connection terminal group P2or a current flowing through a fourth discharge lamp connection terminal group P4, and generates a second current detection signal S2. A signal processor30receives the first current detection signal S1and the second current detection signal S2, and generates a signal S01which is used to detect an open state of a discharge lamp based on intensities of both the current detection signals S1and S2.
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Gamou Masahiro
Kitajima Nobuo
Maeda Hiroshi
Shinbo Satoshi
Sugimoto Satoshi
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
TDK Corporation
Vu Jimmy
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