Amplification circuit, driver circuit for display, and display
AssigneeSony Corporation
InventorsKeiko Kawaguchi, Koji Tsukamoto
Life of this patent
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Abstract
An amplification circuit includes: an amplifier apparatus configured to amplify an input signal and outputting the amplified signal from an output terminal; and a boost circuit which, when a difference between a voltage of the input signal and a voltage at the output terminal is greater than a given value, supplies a positive or negative constant electrical current to at least one given part of the amplifier apparatus, thus enhancing output responsiveness of the amplifier apparatus.
Claims14
An amplification circuit comprising:
- an amplifier apparatus configured to amplify an input signal and output the amplified signal from an output terminal, the amplifier apparatus comprising an operational amplifier including a differential amplifier receiving the input signal and an output amplifier configured to amplify an output of the differential amplifier and provide an output signal at the output terminal, the output amplifier having a first capacitive element and a second capacitive element;
- and
- a boost circuit connected to the differential amplifier and the output amplifier, and configured to compare a voltage of the input signal and a voltage at the output terminal with respect to a given value, the boost circuit being configured to supply a positive or negative constant electrical current to at least one of the first capacitive element and the second capacitive element of the amplifier apparatus,
- wherein,
- the boost circuit is configured to electrically discharge one or both of the first and second capacitive elements when the voltage of the input signal is higher than the voltage at the output terminal by more than the given value, and
- the boost circuit is configured to electrically charge one or both of the first and second capacitive elements when the voltage of the input signal is lower than the voltage at the output terminal by more than the given value.
A driver circuit for a liquid crystal display, the driver circuit being operable to output a driver signal for driving each pixel formed in a display portion of the LCD for displaying an image, the driver circuit comprising:
- an amplifier apparatus configured to amplify an input signal and output the amplified signal from an output terminal, the amplifier apparatus being an operational amplifier including a differential amplifier and an output amplifier, the output amplifier having a first capacitive element and a second capacitive element, data lines of the display portion are connected to the output terminal;
- and
- a boost circuit configured to compare a voltage of the input signal and a voltage at the output terminal with respect to a given value, the boost circuit being configured to supply a positive or negative constant electrical current to at least one of the first capacitive element and the second capacitive element of the amplifier apparatus, the driver circuit is provided for each data line of the display portion of the LCD,
- wherein,
- the boost circuit is configured to electrically discharge one or both of the first and second capacitive elements when the voltage of the input signal is higher than the voltage at the output terminal by more than the given value, and
- the boost circuit is configured to electrically charge one or both of the first and second capacitive elements when the voltage of the input signal is lower than the voltage at the output terminal by more than the given value.
A display device having a driver circuit for outputting a driver signal used to drive each vertical pixel formed in a display portion configured to display an image,
- wherein,
- the driver circuit has:
- an amplifier apparatus configured to amplify an input signal and output the amplified signal from an output terminal, the amplifier apparatus being an operational amplifier including a differential amplifier and an output amplifier, the output amplifier having a capacitive device;
- and
- a boost circuit configured to compare a voltage of the input signal and a voltage at the output terminal with respect to a given value, the boost circuit being configured to supply a positive or negative constant electrical current to at least the capacitive device, and
- the boost circuit is configured to electrically discharge the capacitive device when the voltage of the input signal is higher than the voltage at the output terminal by more than the given value, and
- the boost circuit is configured to electrically charge the capacitive device when the voltage of the input signal is lower than the voltage at the output terminal by more than the given value.
Dependencies are inferred from the claim text.