Voltage supply circuit, display device, electronic equipment, and voltage supply method
View Patent ↗A voltage supply circuit including: first and second nodes; a predetermined potential; and an output transistor having its control terminal connected to the first node, its first terminal connected to the second node and its second terminal connected to an output terminal. The circuit further includes: a switching element which turns on in response to an active reset signal to connect the potential and the first and second nodes together; a first capacitor connected to the first node and supplied with a clock; a second capacitor connected to the second node and supplied with another clock; and an adjustment section adapted to adjust the clock amplitudes so that the potentials of the first and second nodes vary with a predetermined difference maintained therebetween. The reset signal is basically reverse in phase to the clocks.
1. A voltage supply circuit comprising:
first and second nodes;
a predetermined potential;
an output transistor having its control terminal connected to the first node, its first terminal connected to the second node and its second terminal connected to an output terminal;
a switching element which turns on in response to an active reset signal to connect the potential and the first and second nodes together;
a first capacitor connected to the first node and supplied with a clock;
a second capacitor connected to the second node and supplied with another clock; and
an adjustment section adapted to adjust the clock amplitudes so that the potentials of the first and second nodes vary with a predetermined difference maintained therebetween, wherein
the reset signal is basically reverse in phase to the clocks.
2. The voltage supply circuit of claim 1 , wherein
the adjustment section has the capability to generate first and second clocks different in amplitude from each other and feed the first clock to the first capacitor and the second clock to the second capacitor; and wherein
the adjustment section sets the first clock to an amplitude larger than that of the second clock.
3. The voltage supply circuit of claim 1 , wherein
the adjustment section has an additional capacitance connected to the second node; and wherein
the adjustment section has the capability to feed a single clock in parallel to the first and second capacitors.
4. The voltage supply circuit of claim 2 , wherein
the adjustment section has the capability to generate the reset signal and the first and second clocks from a single clock and feed them to the switching element and the first and second capacitors.
5. The voltage supply circuit of claim 3 , wherein
the adjustment section has the capability to generate the reset signal and the clock from a single clock and feed them to the switching element and the first and second capacitors.
6. The voltage supply circuit of claim 2 , wherein the reset signal leads the first and second clocks.
7. The voltage supply circuit of claim 6 , wherein the adjustment section has a delay circuit adapted to delay the clocks with the reset signal.
8. The voltage supply circuit of claim 3 , wherein the reset signal leads the first and second clocks.
9. The voltage supply circuit of claim 8 , wherein the adjustment section has a delay circuit adapted to delay the clocks with the reset signal.
10. The voltage supply circuit of claim 2 , wherein
the reset signal is inactive for a longer period than a potential is output from the output transistor.
11. The voltage supply circuit of claim 3 , wherein
the reset signal is inactive for a longer period than a potential is output from the output transistor.
12. The voltage supply circuit of claim 4 , wherein the adjustment section has the capability to generate the reset signal from a clock and an enable signal.
13. The voltage supply circuit of claim 5 , wherein
the adjustment section has the capability to generate the reset signal from a clock and an enable signal.
14. A voltage supply method for supplying voltage using first and second capacitors and an output transistor, the first capacitor connected to a first node and supplied with a clock, the second capacitor connected to a second node and supplied with another clock, the output transistor having its control terminal connected to the first node, its first terminal connected to the second node, and its second terminal connected to an output terminal, the voltage supply method comprising the steps of:
firstly connecting a predetermined potential and the first and second nodes while a reset signal which is basically reverse in phase to the clocks is active;
secondly adjusting the clock amplitudes so that the potentials of the first and second nodes vary with a predetermined difference maintained therebetween; and
thirdly outputting a voltage commensurate with the potential of the second node from the output transistor in response to a variation in potential.