| 摘要 |
<p>An output pulse of a level shifter (311) which is always in the power ON state is used to set a level shifter (321) of the next hierarchy to an operation state. Output pulses of the level shifter (311) and the level shifter (321) are used to generate control pulses LT1 and LT2, respectively. These control pulses LT1 and LT2 are used to set level shifters of the next hierarchy (341 to 346) to an operation state. One of the output pulses of the level shifters is used to set the level shifters of the next hierarchy (351, 352, 353) to an operation state. Thus, by performing hierarchical control, each level shifter is set to an operation state only for a necessary period, thereby reducing DC current consumption in the level conversion circuit. This enables construction of a level conversion circuit in which DC current consumption is reduced and the power consumption in the entire apparatus is reduced, a display apparatus using the circuit, and a cellular terminal apparatus using the display apparatus as an output display unit.</p> |
