| 主权项 |
1. A display driver comprising:
a plurality of drive terminals which are coupled to signal electrodes of a display panel; and a signal electrode driving circuit, wherein the signal electrode driving circuit includes a plurality of source amplifiers which are respectively coupled to the plurality of drive terminals, receive a gradation voltage corresponding to display data, and output a drive voltage corresponding to the gradation voltage to the drive terminals, wherein the source amplifier includes a voltage output circuit which outputs the drive voltage corresponding to an input gradation voltage, and a slew rate assist circuit which accelerates a transition of the output drive voltage of the voltage output circuit, wherein the slew rate assist circuit starts the acceleration after a predetermined time from the start of transition of the output voltage, and the transition starts in response to a start transition of the gradation voltage, wherein the voltage output circuit includes a positive polarity side output transistor, a negative polarity side output transistor, and a first amplification circuit, the positive polarity side output transistor is coupled between a positive polarity side power supply and a drive terminal, the negative polarity side output transistor is coupled between a negative polarity side power supply and the drive terminal, and the first amplification circuit receives the gradation voltage and outputs a positive polarity side control signal which controls a control electrode of the positive polarity side output transistor and a negative polarity side control signal which controls a control electrode of the negative polarity side output transistor, wherein the slew rate assist circuit is configured so as to enable transitions of the positive polarity side control signal and the negative polarity side control signal to be accelerated, wherein the slew rate assist circuit receives a positive polarity side clock and a negative polarity side clock, controls whether or not to accelerate the transition of the positive polarity side control signal based on the positive polarity side clock, and controls whether or not to accelerate the transition of the negative polarity side control signal based on the negative polarity side clock, and wherein the slew rate assist circuit starts the acceleration of the transition of the positive polarity side control signal after a period of a pulse width of the positive polarity side clock from the start of transition of the gradation voltage, and starts the acceleration of the transition of the negative polarity side control signal after a period of a pulse width of the negative polarity side clock from the start of transition of the gradation voltage. |
