| US 7,586,467 B2 | ||
| Load drive circuit, integrated circuit, and plasma display | ||
| Junichi Sakano, Hitachi (Japan); Kenji Hara, Hitachi (Japan); and Mutsuhiro Mori, Mito (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan); and Advanced PDP Development Center Corporation, Tokyo (Japan) | ||
| Filed on May 17, 2006, as Appl. No. 11/434,913. | ||
| Claims priority of application No. 2005-147964 (JP), filed on May 20, 2005. | ||
| Prior Publication US 2006/0267408 A1, Nov. 30, 2006 | ||
| Int. Cl. G09G 3/28 (2006.01) | ||
| U.S. Cl. 345—60 [345/63; 345/211; 315/169.4] | 20 Claims |
| 1. A load drive circuit using voltage-drive type semiconductor switching elements to supply high and low voltages to a load,
said load drive circuit comprising:
first and second semiconductor switching elements connected in series with a main power source;
said load connected in parallel with said second semiconductor switching element;
a switching command circuit that generates two pulse signals as switching commands to supply voltages to said load;
a bistable circuit that is switched between two stable states in response to said two pulse signals and that holds a gate-emitter
voltage of said first semiconductor switching element at either one of said high and low voltages; and
a control circuit that responds to said two pulse signals to control said second semiconductor switching element to be turned
on/off complementary with said first semiconductor switching element, wherein a power source to said bistable circuit is supplied
from said main power source or another power source connected to a fixed potential point of said main power source, and a
potential of a positive terminal of said source power to said bistable circuit is maintained higher than that of a positive
terminal of said main power source.
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