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US 8,411,018 B2Granted
Method and apparatus for driving a liquid crystal display device
AssigneeAu Optronics Corporation
InventorsChun-Fan Chung, Sheng-Kai Hsu
Life of this patent
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Abstract
A source driver comprising a first DAC with a positive polarity (PDAC), a second DAC with a negative polarity (NDAC), first and second operational amplifiers. Each operational amplifier is characterized with a 1st & 2nd stage and an output stage. The PDAC and NDAC are coupled to the first and second operational amplifiers through a first pair of switches. The 1st & 2nd and output stages of the first operational amplifier are coupled to the 1st & 2nd and output stages of the second operational amplifier through a second pair of switches. The first and second operational amplifiers are coupled to odd data lines and even data line through a third pair of switches.
Claims30
A source driver for driving a display having a plurality of pixels spatially arranged in a matrix form, and a plurality of data lines, each data line being associated with pixels of a corresponding pixel column, comprising:
- (a) a first pair of switches, a second pair of switches, and a third pair of switches, controlled by a control signal;
- (b) a first analog circuit having a first input electrically coupled to one of the first pair of switches for receiving a first converted signal or a second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a first amplified signal;
- (c) a second analog circuit having a first input electrically coupled to the other of the first pair of switches for receiving the first converted signal or the second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a second amplified signal;
- (d) a first output stage with a positive polarity having a first input electrically coupled to the output of the first analog circuit and the output of the second analog circuit through one of the second pair of switches for receiving the first amplified signal from the first analog circuit or the second amplified signal from the second analog circuit, a second input for receiving the power supply voltage, a third input for receiving the first middle voltage, and an output for outputting a first data signal;
- and
- (e) a second output stage with a negative polarity having a first input electrically coupled to the output of the first analog circuit and the output of the second analog circuit through the other of the second pair of switches for receiving the first amplified signal from the first analog circuit or the second amplified signal from the second analog circuit, a second input for receiving the second middle voltage, a third input for receiving the ground voltage, and an output for outputting a second data signal,
- wherein each odd data line of the plurality of data line are electrically coupled to the output of the first output stage and the output of the second output stage through one of the third pair of switches for receiving the first data signal from the first output stage or the second data signal from the second output stage;
- wherein each even data line of the plurality of data line are electrically coupled to the output of the first output stage and the output of the second output stage through the other of the third pair of switches for receiving the first data signal from the first output stage or the second data signal from the second output stage;
- and
- wherein the third pair of switches is configured such that each odd data line of the plurality of data line receives one of the first and second data signals, while each even data line of the plurality of data line receives the other of the first and second data signals, and vice versa.
7 more elements
A method for driving a display having a plurality of pixels spatially arranged in a matrix form, and a plurality of data lines, each data line being associated with pixels of a corresponding pixel column, comprising the steps of:
- (a) providing a power supply voltage, a ground voltage, a first middle voltage, a second middle voltage, and a control signal, having a low state and a high state;
- and
- (b) providing a source driver comprising:
- (i) a first pair of switches, a second pair of switches, and a third pair of switches, controlled by the control signal;
- (ii) a first analog circuit having a first input electrically coupled to one of the first pair of switches for receiving a first converted signal or a second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a first amplified signal;
- (iii) a second analog circuit having a first input electrically coupled to the other of the first pair of switches for receiving the first converted signal or the second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a second amplified signal;
- (iv) a first output stage with a positive polarity having a first input electrically coupled to the output of the first analog circuit and the output of the second analog circuit through one of the second pair of switches for receiving the first amplified signal from the first analog circuit or the second amplified signal from the second analog circuit, a second input for receiving the power supply voltage, a third input for receiving the first middle voltage, and an output for outputting a first data signal;
- and
- (v) a second output stage with a negative polarity having a first input electrically coupled to the output of the first analog circuit and the output of the second analog circuit through the other of the second pair of switches for receiving the first amplified signal from the first analog circuit or the second amplified signal from the second analog circuit, a second input for receiving the second middle voltage, a third input for receiving the ground voltage, and an output for outputting a second data signal,
- wherein each odd data line of the plurality of data line are electrically coupled to the output of the first output stage and the output of the second output stage through one of the third pair of switches for receiving the first data signal from the first output stage or the second data signal from the second output stage;
- wherein each even data line of the plurality of data line are electrically coupled to the output of the first output stage and the output of the second output stage through the other of the third pair of switches for receiving the first data signal from the first output stage or the second data signal from the second output stage;
- and
- wherein the third pair of switches is configured such that each odd data line of the plurality of data line receives one of the first and second data signals, while each even data line of the plurality of data line receives the other of the first and second data signals, and vice versa.
10 more elements
A source driver for driving a display having a plurality of pixels spatially arranged in a matrix form, and a plurality of data lines, each data line being associated with pixels of a corresponding pixel column, comprising:
- (a) a first pair of switches, a second pair of switches, and a third pair of switches, controlled by a control signal;
- (b) a first operational amplifier comprising:
- a 1st & 2nd stage having a first input electrically coupled to one of the first pair of switches for receiving a first converted signal or a second converted signal, a second input for receiving a power supply voltage, a third input for receiving a ground voltage, and an output for outputting a first amplified signal;
- and
- an output stage having a first input, a second input for receiving the power supply voltage, a third input for receiving a first middle voltage, and an output for outputting a first data signal;
- and
- (c) a second operational amplifier comprising:
- a 1st & 2nd stage having a first input electrically coupled to the other of the first pair of switches for receiving the first converted signal or the second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a second amplified signal;
- and
- an output stage having a first input, a second input for receiving a second middle voltage, a third input for receiving the ground voltage, and an output for outputting a second data signal;
- wherein the first input of the output stage of the first operational amplifier is electrically coupled to the output of the 1st & 2nd stage of the first operational amplifier and the output of the 1st & 2nd stage of the second operational amplifier through one of the second pair of switches for receiving the first amplified signal from the 1st & 2nd stage of the first operational amplifier or the second amplified signal from the 1st & 2nd stage of the second operational amplifier;
- wherein the first input of the output stage of the second operational amplifier is electrically coupled to the output of the 1st & 2nd stage of the first operational amplifier and the output of the 1st & 2nd stage of the second operational amplifier through the other of the second pair of switches for receiving the first amplified signal from the 1st & 2nd stage of the first operational amplifier or the second amplified signal from the 1st & 2nd stage of the second operational amplifier;
- wherein each odd data line of the plurality of data line are electrically coupled to the output of the output stage of the first operational amplifier and the output of the output stage of the second operational amplifier through one of the third pair of switches for receiving the first data signal from the output stage of the first operational amplifier or the second data signal from the output stage of the second operational amplifier;
- wherein each even data line of the plurality of data line are electrically coupled to the output of the output stage of the first operational amplifier and the output of the output stage of the second operational amplifier through the other of the third pair of switches for receiving the first data signal from the output stage of the first operational amplifier or the second data signal from the output stage of the second operational amplifier;
- and
- wherein the third pair of switches is configured such that each odd data line of the plurality of data line receives one of the first and second data signals, while each even data line of the plurality of data line receives the other of the first and second data signals, and vice versa.
13 more elements
A method for driving a display having a plurality of pixels spatially arranged in a matrix form, and a plurality of data lines, each data line being associated with pixels of a corresponding pixel column, comprising the steps of:
- (a) providing a power supply voltage, a ground voltage, a first middle voltage, a second middle voltage, and a control signal, having a low state and a high state;
- and
- (b) providing a source driver comprising:
- (i) a first pair of switches, a second pair of switches, and a third pair of switches, controlled by the control signal;
- (ii) a first operational amplifier comprising:
- a 1st & 2nd stage having a first input electrically coupled to one of the first pair of switches for receiving a first converted signal or a second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a first amplified signal, and
- an output stage having a first input, a second input for receiving the power supply voltage, a third input for receiving the first middle voltage, and an output for outputting a first data signal;
- and
- (iii) a second operational amplifier comprising:
- a 1st & 2nd stage having a first input electrically coupled to the other of the first pair of switches for receiving the first converted signal or the second converted signal, a second input for receiving the power supply voltage, a third input for receiving the ground voltage, and an output for outputting a second amplified signal, and
- an output stage having a first input, a second input for receiving the second middle voltage, a third input for receiving the ground voltage, and an output for outputting a second data signal;
- wherein the first input of the output stage of the first operational amplifier is electrically coupled to the output of the 1st & 2nd stage of the first operational amplifier and the output of the 1st & 2nd stage of the second operational amplifier through one of the second pair of switches for receiving the first amplified signal from the 1st & 2nd stage of the first operational amplifier or the second amplified signal from the 1st & 2nd stage of the second operational amplifier;
- wherein the first input of the output stage of the second operational amplifier is electrically coupled to the output of the 1st & 2nd stage of the first operational amplifier and the output of the 1st & 2nd stage of the second operational amplifier through the other of the second pair of switches for receiving the first amplified signal from the 1st & 2nd stage of the first operational amplifier or the second amplified signal from the 1st & 2nd stage of the second operational amplifier;
- wherein each odd data line of the plurality of data line are electrically coupled to the output of the output stage of the first operational amplifier and the output of the output stage of the second operational amplifier through one of the third pair of switches for receiving the first data signal from the output stage of the first operational amplifier or the second data signal from the output stage of the second operational amplifier;
- wherein each even data line of the plurality of data line are electrically coupled to the output of the output stage of the first operational amplifier and the output of the output stage of the second operational amplifier through the other of the third pair of switches for receiving the first data signal from the output stage of the first operational amplifier or the second data signal from the output stage of the second operational amplifier;
- and
- wherein the third pair of switches is configured such that each odd data line of the plurality of data line receives one of the first and second data signals, while each even data line of the plurality of data line receives the other of the first and second data signals, and vice versa.
14 more elements
Dependencies are inferred from the claim text.