Pre-drive circuit, capacitive load drive circuit and plasma display apparatus
A pre-drive circuit having low deviation of timing of a high level and a low level output voltages is disclosed. A plurality of drive systems are comprised, each having an input amplifier circuits for amplifying input voltages input to input voltage terminals, high level shift circuits for shifting signal levels output from the input amplifier circuits, and output amplifier circuits for amplifying shift signals output from the high level shift circuits, and each drive system has the same constitution.
1. A plasma display apparatus, comprising:
a plurality of X electrodes, a plurality of Y electrodes arranged adjacently to the plurality of X electrodes by turns and each causing a discharge to occur between the neighboring X and Y electrodes, an X electrode drive circuit for applying a discharge voltage to the plurality of X electrodes, and a Y electrode drive circuit for applying a discharge voltage to the plurality of Y electrodes;
a pre-drive circuit comprising first, second, third and fourth drive systems, each having an input amplifier circuit amplifying an input voltage, input to an input voltage terminal, a high level shift circuit shifting a level of a signal output from the input amplifier circuit and an output amplifier circuit amplifying a shift signal output from the high level shift circuit, wherein each drive system has a common constitution and the plurality of drive systems are provided within an IC formed on a common semiconductor chip;
at least one of the X electrode drive circuit and the Y electrode drive circuit comprising:
a first switch supplying a high level voltage to the plurality of X electrodes or the plurality of Y electrodes,
a second switch supplying a low level voltage to the plurality of X electrodes or the plurality of Y electrodes,
a third switch supplying a high level voltage to the plurality of X electrodes or the plurality of Y electrodes via a first coil, and
a fourth switch supplying a low level voltage to the plurality of X electrodes or the plurality of Y electrodes via a second coil;
the first drive system of the pre-drive circuit driving the first switch;
the second drive system of the pre-drive circuit driving the second switch;
the third drive system of the pre-drive circuit driving the third switch; and
the fourth drive system of the pre-drive circuit driving the fourth switch.
2. The plasma display apparatus as set forth in claim 1 , wherein a voltage different from the reference voltage is applied to a terminal of the third switch, other than a terminal thereof connected to the plurality of X electrodes or the plurality of Y electrodes.
3. The plasma display apparatus as set forth in claim 1 , wherein a voltage, other than a middle voltage between the high level voltage and the low level voltage, a supplied to a terminal of the third switch element other than a terminal thereof connected to the plurality of X electrodes or the plurality of Y electrodes.