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US 8,310,422 B2Granted
Operational amplifier circuit and display apparatus using the same
AssigneeRenesas Electronics Corporation
InventorKouichi Nishimura
Life of this patent
Estimating the term…
Abstract
An operational amplifier circuit includes: an input differential stage circuit supplied with power supply voltages in a first voltage range; and an output stage circuit supplied with power supply voltages in a second voltage range which is different from the first voltage range. The operational amplifier circuit amplifies a signal supplied to the input differential stage circuit and outputs the amplified signal from the output stage circuit to drive a load.
Claims14
An operational amplifier circuit comprising:
- an input differential stage circuit supplied with power supply voltages in a first voltage range;
- an output stage circuit supplied with power supply voltages in a second voltage range which is different from said first voltage range;
- a positive polarity amplifier;
- and
- a negative polarity amplifier,
- wherein said operational amplifier circuit amplifies a signal supplied to said input differential stage circuit and outputs the amplified signal from said output stage circuit to drive a load,
- an input differential stage circuit of said positive polarity amplifier is supplied with first and second voltages as the power supply voltages,
- an output stage circuit of said positive polarity amplifier is supplied the second voltage and a third voltage higher than the first voltage as the power supply voltages,
- an input differential stage circuit of said negative polarity amplifier is supplied with the first voltage and the second voltage as the power supply voltages, and
- an output stage circuit of said negative polarity amplifier is supplied with the first voltage and a fourth voltage lower than the second voltage as the power supply voltage.
7 more elements
A display apparatus comprising:
- a digital-analog converter configured to output one of reference voltages outputted from a gray scale voltage generating circuit to an operational amplifier circuit based on a display signal;
- a display panel having a pixel;
- and
- said operational amplifier circuit configured to drive said pixel based on the output from said digital-analog converter,
- wherein said operational amplifier circuit comprises:
- an input differential stage circuit supplied with power supply voltages in a first voltage range and configured to amplify a signal outputted from said digital-analog converter;
- an output stage circuit supplied with power supply voltages in a second voltage range which is different from said first voltage range, and configured to output the amplified signal to drive the pixel as a load;
- a positive polarity amplifier;
- and
- a negative polarity amplifier, and
- wherein an input differential stage circuit of said positive polarity amplifier is supplied with first and second voltages as the power supply voltages,
- an output stage circuit of said positive polarity amplifier is supplied the second voltage and a third voltage higher than the first voltage as the power supply voltages,
- an input differential stage circuit of said negative polarity amplifier is supplied with the first voltage and the second voltage as the power supply voltages;
- and
- an output stage circuit of said negative polarity amplifier is supplied with the first voltage and a fourth voltage lower than the second voltage as the power supply voltage.
12 more elements
Dependencies are inferred from the claim text.