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

  • US 7,480,164 B2
  • Filed: 10/15/2007
  • Issued: 01/20/2009
  • Est. Priority Date: 04/10/2001
  • Status: Expired due to Fees
First Claim
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1. A display system comprising:

  • a display panel having first and second electrodes; and

    a display controller on a semiconductor substrate, the display controller coupled to the first and the second electrodes of the display panel, the display controller comprising;

    a power supply circuit coupled to receive an external source voltage and generating a positive voltage higher than the external source voltage and a negative voltage lower than a ground potential, the positive voltage and the negative voltage being 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; 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.

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