| 主权项 |
1. A display drive circuit comprising:
a first amplifier circuit and a second amplifier circuit each amplifying either one of two input signals that are in-phase and antiphase; a switching circuit which selectively switches the two input signals in accordance with a switching signal and supplies the two input signals thus switched to the first amplifier circuit and the second amplifier circuit, respectively; and a switching control circuit which controls switching of the switching circuit by supplying the switching signal to the switching circuit, wherein the switching control circuit supplies the switching signal to the switching circuit, the switching signal having a higher frequency than a horizontal synchronization signal; when the switching signal has a first electric potential, a first intrinsic offset voltage that is a characteristic of the first amplifier circuit is selected by the switching control circuit; when the switching signal has a second electric potential, a second intrinsic offset voltage that is a characteristic of the second amplifier circuit is selected by the switching control circuit; and the switching signal has an electric potential that is switched so that:
after the first electric potential is selected, the first electric potential is switched to the second electric potential before an offset voltage produced in the first amplifier circuit reaches the first intrinsic offset voltage; andafter the second electric potential is selected, the second electric potential is switched to the first electric potential before an offset voltage produced in the second amplifier circuit reaches the second intrinsic offset voltage. |
