Patent ID: 6407725
Filing Date: 2002-06-18
Classification: G09G,Y10S

Abstract:
An apparatus for detecting lowering of at least one of first and second output voltages from a driving apparatus of a plasma display panel below a corresponding threshold voltage due to excessive current flow in the plasma display panel and generating an output control signal transmitted to the driving apparatus, the apparatus for detecting comprising:a switching transistor having a collector to which a bias voltage is applied, an emitter which is grounded, and a base, the switching transistor being operated according to a voltage applied to the base and generating an output control signal through the collector; a voltage signal generating portion connected between the base of the switching transistor and a port of a first output voltage produced by a plasma display panel driving apparatus, and between the base and a port of a second output voltage produced by the plasma display panel driving apparatus, respectively, for changing a bias voltage applied to the base as the first and second output voltages change; and a switching support portion connected between the emitter of the switching transistor and at least one of the ports of the first and second output voltages, for applying a lowered voltage to the emitter when at least one of the first and second output voltages is lower than a corresponding threshold voltage, preventing incorrect operation of the switching transistor.