Patent ID: 8587628
Filing Date: 2013-11-19
Classification: B41J

Abstract:
1. A driver apparatus for driving a plurality of light emitting elements commonly connected to a common terminal, comprising: a clock driver configured to output a first clock pulse to a first output terminal and a second clock pulse to a second output terminal, the first clock pulse and the second clock pulse being produced based on a scanning square signal and outputted alternately; a differentiating circuit formed of an inductor and a resistor, the differentiating circuit differentiating the first clock pulse thereby to produce a first clock and differentiating the second clock pulse to thereby produce a second clock, the first clock and the second clock each having a waveform that is produced by back electromotive force induced across the inductor; a first clock terminal to which the first clock is outputted from the differentiating circuit; a second clock terminal to which the second clock is outputted from the differentiating circuit; a data driver circuit that outputs a data signal to the common terminal in response to an ON/OFF command signal; a scanning circuit including a plurality of cascaded sub scanning stages which starts to operate in response to a starting signal such that the cascaded sub scanning stages turn on in sequence one at a time, the plurality of cascaded sub scanning stages having an odd-numbered sub scanning stage that turns on in response to the first clock and outputs a drive signal to a corresponding one of the light emitting elements, and an even-numbered sub scanning stage that turns on in response to the second clock and outputs a drive signal to a corresponding one of the light emitting elements, wherein the light emitting elements emit light only when the drive signal and the ON/OFF command signal are fed to the light emitting elements.