US 8,552,960 B2Granted

Output amplifier circuit and data driver of display device using the circuit

AssigneeRenesas Electronics Corporation

InventorHiroshi Tsuchi

Life of this patent

Estimating the term…

Loading patent…

Abstract

An output amplifier includes a differential stage having a reference voltage supplied to a first input, a first output stage that receives an output of the differential stage, a second output stage whose output is connected to a load, a capacitor element having a first end connected to a second input of the differential stage, and connection control circuits that control switching of first and second connection modes. In the first connection mode, there are provided a non-conductive state between output of the differential stage and input of the second output stage, a non-conductive state between output of the first output stage and output of the second output stage, a conductive state between output of the first output stage and the second input of the differential stage, and voltage of a second end of the capacitor element is an input voltage from the input terminal. In the second connection mode, there are provided a conductive state between output of the differential stage and input of the second output stage, a conductive state between output of the first output stage and output of the second output stage; a non-conductive state between output of the first output stage and the second input of the differential stage, a non-conductive state of the second end of the capacitor element from the input terminal, and a conductive state between the output of the first output stage and the second end of the capacitor element.

Claims20

Dependent claims

An output amplifier circuit comprising:

an input terminal that receives an input voltage;
a differential stage having a first input supplied with a reference voltage, a second input, and first and second outputs;
a first output stage having first and second inputs connected respectively to the first and second outputs of the differential stage;
a second output stage having first and second inputs and having an output connected to a load;
a capacitor element having a first end connected to the second input of the input pair of the differential stage;
and
a control circuit that controls switching between a first connection mode and a second connection mode, wherein
the control circuit controls such that
in the first connection mode,
a non-conductive state is set between the first and second outputs of the differential stage and the first and second inputs of the second output stage,
a non-conductive state is set between an output of the first output stage and the output of the second output stage,
a conductive state is set between the output of the first output stage and the second input of the differential stage, and
a conductive state is set between a second end of the capacitor element and the input terminal, the second end of the capacitor being supplied with the input voltage from the input terminal, and
in the second connection mode,
a conductive state is set between the first and second outputs of the differential stage and the first and second inputs of the second output stage;
a conductive state is set between the output of the first output stage and the output of the second output stage;
a non-conductive state is set between the output of the first output stage and the second input of the differential stage;
a non-conductive state is set between the second end of the capacitor element and the input terminal;
and
a conductive state is set between the output of the first output stage and the second end of the capacitor element.

17 more elements

An output amplifier circuit comprising:

an input terminal that receives an input voltage;
an output terminal that outputs an output voltage;
a differential stage having a non-inverting input terminal supplied with a reference voltage and an inverting terminal and having first and second outputs;
a first output stage having first and second inputs connected to the first and second outputs of the differential stage, respectively;
a second output stage having first and second inputs and having an output connected to the output terminal;
a first switch connected between the first output of the differential stage and the first input of the second output stage;
a second switch connected between the second output of the differential stage and the second input of the second output stage;
a third switch connected between an output of the first output stage and the output of the second output stage;
a capacitor element having a first end connected to the inverting input terminal of the differential stage;
a fourth switch connected between the input terminal that receives an input voltage and a second end of the capacitor element;
a fifth switch connected between the output of the first output stage and the first end of the capacitor element;
a sixth switch connected between the output of the first output stage and the second end of the capacitor element;
and
a control circuit that controls conductive and non-conductive states of the first to sixth switches.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/899,149Filed 6 Oct 2010
Priority: JP 2009-2338907 Oct 2009
Published: US 2011/0080214 A17 Apr 2011
Granted: 8 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G09G 3/3688
Details of drivers for data electrodes: suitable for active matrices only
G09G 3/3614
Control of matrices with row and column drivers: control of polarity reversal in general
G09G 2310/027
Details of driving circuits: details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
G09G 2310/0291
Details of driving circuits: details of output amplifiers or buffers arranged for use in a driving circuit