Patent ID: 7253796

Claim:
A circuit for driving a liquid crystal panel of a liquid crystal projector having a plurality of lamps as light sources, comprising: a CPU circuit for managing the overall system and data of the liquid crystal projector; a video signal processing circuit for converting a video signal input from an external source into a digital signal; and a panel correcting circuit for correcting the digital video signal generated by said video signal processing circuit depending on characteristics of a liquid crystal panel of the liquid crystal projector so as to match the liquid crystal panel; wherein said CPU circuit outputs corrective data depending on how the lamps are energized to said panel correcting circuit, and said panel correcting circuit corrects the video signal using said corrective data, and wherein said CPU circuit has data which are different from each other depending on how the lamps are energized, for correcting the video signal depending on the characteristics of the liquid crystal panel in the panel correcting circuit, and outputs corresponding data depending on how the lamps are energized as corrective data to said panel correcting circuit.