Lapis Technology Co., Ltd.

Takuro Kotaki

Hiroshi Tsuchi

Atsushi Hirama

The present invention includes first to j-th DA conversion circuits that are fixedly coupled to one of a plurality of gradation reference voltage generating circuits steadily generating respective gradation reference voltage groups according to gamma correction characteristics of color components different from one another, and select a gradation reference voltage corresponding to a pixel data piece among the gradation reference voltage group generated by the one of gradation reference voltage generating circuits to output the gradation reference voltage as a gradation voltage, an output unit that assigns the first to j-th gradation voltages to respective first to j-th driving voltage signals in a mode according to an output switching signal, and outputs the first to j-th driving voltage signals to the display panel, and an output control unit that generates the output switching signal to switch modes of assigning the first to j-th gradation voltages to the first to j-th driving voltage signals at every division period obtained by dividing a horizontal scanning period by a division number indicated by a division number setting signal, and outputs an input switching signal that causes the first to j-th driving voltage signals to be input in turn to the respective data lines as many as the division number at a cycle of the division periods for the respective first to j-th driving voltage signals.

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Yokohama, Japan

Takuro Kotaki