Patent ID: 7633466

Claim:
An apparatus of luminance adjustment, suitable for a plasma display panel, the apparatus of luminance adjustment comprising: a luminance controller, which is used to output a gray level shifting signal and a power adjustment signal; a gray level shifter, receiving a first luminance video signal and the gray level shifting signal, wherein the first luminance video signal comprises a plurality of gray levels, and after a shifting adjustment on the gray levels of the first luminance video signal according to the gray level shifting signal, outputting a video gray level shifted signal; and a power controller, used to receive the video gray level shifted signal and the power adjustment signal, after a power adjustment on the video gray level shifted signal according to the power adjustment signal, outputting a sub-field controlling signal, wherein the power controller comprises: a display ratio shifter, which is used to receive the power adjustment signal and shift a curve of a power to a display ratio according to the power adjustment signal so as to obtain a display ratio shifting signal; and an automatic power controller, coupled to the display ratio shifter, for receiving the video gray level shifted signal and using the display ratio shifting signal to adjust a sustain pulse frequency of the received video gray level shifted signal so as to output the sub-field controlling signal.