| US 7,480,164 B2 | ||
| Semiconductor integrated circuit with voltage generation circuit, liquid crystal display controller and mobile electric equipment | ||
| Kazuya Endo, Higashimurayama (Japan); Naoki Miyamoto, Kodaira (Japan); Toshio Mizuno, Tokyo (Japan); Takayuki Nakaji, Tachikawa (Japan); Takatoshi Uchida, Kokubunji (Japan); Kazuo Ookado, Kokubunji (Japan); and Yoshikazu Yokota, Kokubunji (Japan) | ||
| Assigned to Renesas Technology Corp., Tokyo (Japan) | ||
| Filed on Oct. 15, 2007, as Appl. No. 11/907,536. | ||
| Application 11/033308 is a division of application No. 10/091405, filed on Mar. 07, 2002, granted, now 6,898,096. | ||
| Application 11/907536 is a continuation of application No. 11/797793, filed on May 08, 2007, granted, now 7,317,627. | ||
| Application 11/797793 is a continuation of application No. 11/503234, filed on Aug. 14, 2006, granted, now 7,233,511. | ||
| Application 11/503234 is a continuation of application No. 11/033308, filed on Jan. 12, 2005, granted, now 7,110,274. | ||
| Claims priority of application No. 2001-110813 (JP), filed on Apr. 10, 2001. | ||
| Prior Publication US 2008/0049480 A1, Feb. 28, 2008 | ||
| Int. Cl. H02M 1/00 (2007.01); H03K 3/01 (2006.01); G09G 3/36 (2006.01); G05F 1/40 (2006.01) | ||
| U.S. Cl. 363—147 [327/534; 345/87] | 13 Claims |
| 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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