Semiconductor integrated circuit with voltage generation circuit, liquid crystal display controller and mobile electric equipment

A display system comprising:

• a display panel having first electrodes and second electrodes;
• a display controller on a semiconductor substrate, the display controller comprising:
• a power supply circuit coupled to receive an external source voltage, the power supply circuit generating a voltage to be applied to the first electrodes of the display panel and generating a positive voltage higher than the external source voltage or a negative voltage lower than a ground potential, the positive voltage and the negative voltage being to be applied to the second electrodes of the display panel;
• a first wiring feeding the negative voltage as a bias voltage to the semiconductor substrate;
• a second wiring supplying the ground potential;
• a switch element coupled between the first wiring and the second wiring;
• a circuit which generates a first control signal to make the switch element conduct temporarily in accordance with a second control signal for starting up the power supply circuit;
• a first drive circuit which supplies signals for driving the first electrodes of the display panel on the basis of a voltage generated by the power supply circuit;
• and
• a second drive circuit which supplies signals for driving the second electrodes of the display panel on the basis of a voltage generated by the power supply circuit;
• and
• a terminal coupled to receive the negative voltage generated from the power supply circuit;
• and
• a diode whose anode coupled to the terminal of the display controller and whose cathode coupled to the ground potential.