Patent ID: 7872499
Filing Date: 2011-01-18
Classification: G09G,H03K

Abstract:
1. A level shift circuit, comprising: an input terminal for receiving an input signal of a relatively low amplitude in a predetermined cycle; an output terminal for outputting an output signal in response to the input signal; a complementary output terminal for outputting a complementary value of the output signal of the output terminal; a first level shifter connected between a first power supply terminal that supplies a first voltage and the output terminal, the first level shifter setting the output terminal to a first voltage level when the input signal received at the input terminal assumes a first value; a second level shifter connected between the output terminal and a second power supply terminal that supplies a second voltage, the second level shifter setting the output terminal to a second voltage level when the input signal received at the input terminal assumes a complementary value of the first value; and a feedback control unit that performs switching between a selection of one of a voltage level at the output terminal and a voltage level at the complementary output terminal and a non-selection of the voltage level at the output terminal and the voltage level at the complementary output terminal, based on control signals supplied thereto in predetermined time intervals of the predetermined cycle, and supplies a signal with a selected voltage level to the first level shifter or to the first and second level shifters to perform a control of deactivating a level shift operation of at least one of the first level shifter and the second level shifter and to cause the output terminal to output the output signal in response to the input signal.