Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-07-24
2007-07-24
Tran, Thuy Vinh (Department: 2821)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S102000, C345S204000
Reexamination Certificate
active
11516474
ABSTRACT:
The present invention provides a driving circuit with protection function for driving a set of external electrode fluorescent lamps (EEFL) . The drive circuit includes, a transformer connected to the set of EEFLs, a switching network connected to the transformer which delivers power to the transformer, a sensing circuit connected to the set of EEFLs which detects disconnection if one light source is disconnected, and a controller connected to the switching network which controls the switching network to reduce the total current supplied to the EEFLs which remain connected, if the sensing circuit detects that one EEFL is disconnected. Appropriate protection can therefore be implemented when the EEFL is disconnected on one end or both ends.
REFERENCES:
patent: 7119495 (2006-10-01), Jang
patent: 2004/0183465 (2004-09-01), Jang
patent: 2005/0078080 (2005-04-01), Kang et al.
patent: 2005/0116662 (2005-06-01), Sanchez
patent: 2005/0174818 (2005-08-01), Lin et al.
Lin Yung-Lin
Liu Da
O2Micro International Limited
Tran Thuy Vinh
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