Driver circuit for converting a CMOS level signal to a high-voltage level
First Claim
1. A driver circuit comprising:
- a first MOS transistor having a source, a gate, and a drain, one of the source and drain being connected to a first power source voltage;
a diode connected between the other of said source and drain of said first MOS transistor and an output terminal;
a second MOS transistor having a source, a gate, and a drain, the drain and the source being respectively connected to said output terminal and a ground voltage, and the gate receiving a first drive signal;
a constant voltage element inserted between the gate of said first MOS transistor and the other of said source and drain of said first MOS transistor;
a third MOS transistor having a source, a gate, and a drain, the drain and the source being respectively connected to said gate of said first MOS transistor and the ground voltage, and the gate receiving a second drive signal;
a bipolar transistor having an emitter, a collector, and a base, wherein the emitter is connected to the first power source voltage and the collector is connected to said gate of said first MOS transistor;
current control means, for controlling a value of current supplied to the base of said bipolar transistor in accordance with a plurality of third drive signals; and
drive signal generating means, for generating the first drive signal, the second drive signal, and the plurality of third drive signals on the basis of an input signal and a control signal.
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Accused Products
Abstract
There is disclosed a driver circuit for driving a flat panel display. In this invention, a gate bias for a MOS transistor for charging an output terminal to high level is generated by a constant voltage element. The value of a current supplied to the constant voltage element is controlled by a current control circuit. In order to turn off the charging MOS transistor, a MOS transistor for discharging the node of the gate of the charging MOS transistor is set in an ON state. In order to switch an output, two drive signals are output from a drive signal generator to turn off both the charging MOS transistor for charging the output terminal to high level and the discharging MOS transistor for discharging the output terminal to low level.
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Citations
10 Claims
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1. A driver circuit comprising:
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a first MOS transistor having a source, a gate, and a drain, one of the source and drain being connected to a first power source voltage; a diode connected between the other of said source and drain of said first MOS transistor and an output terminal; a second MOS transistor having a source, a gate, and a drain, the drain and the source being respectively connected to said output terminal and a ground voltage, and the gate receiving a first drive signal; a constant voltage element inserted between the gate of said first MOS transistor and the other of said source and drain of said first MOS transistor; a third MOS transistor having a source, a gate, and a drain, the drain and the source being respectively connected to said gate of said first MOS transistor and the ground voltage, and the gate receiving a second drive signal; a bipolar transistor having an emitter, a collector, and a base, wherein the emitter is connected to the first power source voltage and the collector is connected to said gate of said first MOS transistor; current control means, for controlling a value of current supplied to the base of said bipolar transistor in accordance with a plurality of third drive signals; and drive signal generating means, for generating the first drive signal, the second drive signal, and the plurality of third drive signals on the basis of an input signal and a control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification