Bias potential generating apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorKazuyoshi Nishi
Life of this patent
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Abstract
A bias potential generating apparatus for generating a plurality of bias potentials by switching with a standby potential set for each bias potential is disclosed. The generated potential is restored to a bias potential from a standby potential by a potential restoration circuit. A drive control circuit controls the drive operation of the potential restoration circuit. The potential restoration circuit is provided for each bias potential. Further, the drive time of the potential restoration circuit is set arbitrarily by a drive time setting circuit.
Claims22
A bias potential generating apparatus for generating a plurality of potentials as bias potentials and generating each of the potentials by switching between a bias potential and a standby potential, comprising:
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- and
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- wherein the potential restoration circuit is provided for each of the generated potential.
A bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential, comprising:
- a potential restoration circuit for restoring a generated potential from the standby potential to the bias potential;
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- and
- a drive time setting circuit for setting the drive time of the potential restoration circuit arbitrarily.
A bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential, comprising:
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- and
- a current setting circuit for arbitrarily setting the restoration current used in the potential restoration circuit at the time of restoring the potential.
A bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential, comprising:
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- and
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- wherein the potential restoration circuit includes a plurality of MOS transistors connected in series with each other for generating a threshold voltage by shorting the gate potential and the drain potential;
- and
- wherein the restoration voltage used for restoring the bias potential can be arbitrarily set by changing the number of the MOS transistors of the potential restoration circuit.
A bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential, comprising:
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- and
- a reference potential generating circuit for generating a reference potential equivalent to the bias potential;
- wherein the drive control circuit drives the potential restoration circuit during the period when the generated potential fails to reach the reference potential, and stops driving the potential restoration circuit when the generated potential reaches the reference potential.
A bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential, comprising:
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- and
- a restoration potential generating circuit for generating a restoration potential equivalent to the bias potential;
- wherein the potential restoration circuit shorts the generated potential and the restoration potential at the time of restoring the bias potential.
A liquid crystal driving apparatus comprising:
- a bias potential generating apparatus for generating a plurality of potentials as bias potentials and generating each potential by switching between a bias potential and a standby potential;
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- and
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- wherein the potential restoration circuit is provided for each of the generated potentials.
A liquid crystal driving apparatus comprising:
- a bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential;
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- and
- a drive time setting circuit for setting the drive time of the potential restoration circuit arbitrarily.
A liquid crystal driving apparatus comprising:
- a bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential;
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- and
- a current setting circuit for arbitrarily setting the restoration current used in the potential restoration circuit at the time of restoring the potential.
A liquid crystal driving apparatus comprising:
- a bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential;
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- and
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- wherein the potential restoration circuit includes a plurality of MOS transistors connected in series with each other for generating a threshold voltage by shorting the gate potential and the drain potential thereof;
- and
- wherein the restoration voltage of the potential restoration circuit used for restoring the bias potential can be arbitrarily set by changing the number of the MOS transistors.
A liquid crystal driving apparatus comprising:
- a bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential;
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- a drive control circuit for controlling the drive operation of the potential restoration circuit;
- and
- a reference potential generating circuit for generating a reference potential equivalent to the bias potential;
- wherein the drive control circuit drives the potential restoration circuit during the period when the generated potential fails to reach the reference potential and stops driving the potential restoration circuit when the generated potential reaches the reference potential.
A liquid crystal driving apparatus comprising:
- a bias potential generating apparatus for generating a potential by switching between a bias potential and a standby potential;
- a potential restoration circuit for restoring the generated potential from the standby potential to the bias potential;
- and
- a restoration potential generating circuit for generating a restoration potential equivalent to the bias potential;
- wherein the potential restoration circuit shorts the generated potential to the restoration potential at the time of restoring the bias potential.
Dependencies are inferred from the claim text.