Source drive chip of liquid crystal display
View Patent ↗The present disclosure discloses a source driver chip comprising a reference voltage input terminal and a data signal output channel in which an operational amplifier for outputting a data signal is disposed. When at least one of the operational amplifiers is in idle instead of being used for outputting the data signal, the operational amplifier in idle is connected to the reference voltage input terminal and used to amplify a reference voltage inputted to the reference voltage input terminal; or the operational amplifier in idle is connected to an external circuit and used to amplify an external circuit signal other than the reference voltage. The present disclosure can save the operational amplifiers in the peripheral driving circuit, and reduce the cost of the peripheral driving circuit as well as the power consumption.
1. A source driver chip of a liquid crystal display comprising:
a multiplexer and digital-to-analog conversion module for inputting N data signals;
a first input module for inputting one or more external circuit signals;
an input selection controller connected to the multiplexer and digital-to-analog conversion module and the first input module;
a data signal output channel group connected to the input selection controller and in which M operational amplifiers being disposed, M being larger than or equal to N;
an output selection controller connected to the data signal output channel group;
a data signal output terminal connected to the output selection controller and used to output amplified data signals; and
a first output module connected to the output selection controller and used to output amplified external circuit signals,
wherein the input selection controller and the output selection controller are used to connect N operational amplifiers of the M operational amplifiers to the multiplexer and digital-to-analog conversion module so as to amplify the N data signals respectively, and connect at least one of remaining (M−N) operational amplifiers of the M operational amplifiers to the first input module so as to amplify at least one of the external circuit signals.
2. The source driver chip according to the claim 1 , wherein, an input terminal of each operational amplifier of the M operational amplifiers is connected to the input selection controller, and an output terminal of the each operational amplifier of the M operational amplifiers is connected to the output selection controller, the input selection controller and the output selection controller are used to control the each operational amplifier to amplify the external circuit signals or the data signals, and the external circuit signals include reference voltages or external circuit signals other than the reference voltages.
3. The source driver chip according to the claim 2 , wherein, the input selection controller and the output selection controller are CMOS selection control circuits.
4. The source driver chip according to the claim 3 , wherein, further comprising a signal selection control line connected to the input selection controller and the output selection controller respectively, and used to control the input selection controller and the output selection controller to select amplification on the data signals or the external circuit signals by the operational amplifiers.
5. The source driver chip according to the claim 1 , wherein the input terminals of a part of the M operational amplifiers are connected to the input selection controller, and the output terminals thereof are connected to the output selection controller, the input selection controller and the output selection controller are used to control the part of the M operational amplifiers to amplify reference voltages or the data signals; and
the input terminals of another part of the M operational amplifiers are connected to the input selection controller, and the output terminals thereof are connected to the output selection controller, the input selection controller and the output selection controller are used to control the other part of the M operational amplifiers to amplify external circuit signals other than the reference voltages or the data signals.
6. The source driver chip according to the claim 5 , wherein, the input selection controller and the output selection controller are CMOS selection control circuits.
7. The source driver chip according to the claim 6 , wherein, further comprising a signal selection control line connected to the input selection controller and the output selection controller respectively, and used to control the input selection controller and the output selection controller to select amplification on the data signals or the external circuit signals by the operational amplifiers.
8. The source driver chip according to the claim 1 , wherein, each operational amplifier of the M operational amplifiers includes a first input terminal and a second input terminal as well as a first output terminal and a second output terminal; the first input terminal and the first output terminal are used to connect the each operational amplifier to a data signal channel in which the data signals are normally outputted, the second input terminal and the second output terminal are used to connect the each operational amplifier to an external circuit signal channel in which amplification is performed on the external circuit signals, the external circuit signals including reference voltages or external circuit signals other than the reference voltages; when the remaining (M−N) operational amplifiers exists in each of the source driver chips for the liquid crystal display, the data signal channel is blown by the integrated circuit blowing technology and a program manner of blowing programmer; the at least one of the remaining (M−N) operational amplifiers is connected to the external circuit signal channel through the second input terminal and the second output terminal, and used to amplify the at least one of the external circuit signals.
9. The source driver chip according to the claim 1 , wherein, each operational amplifier of the M operational amplifiers includes a first input terminal and a second input terminal as well as a first output terminal and a second output terminal; the first input terminal and the first output terminal are used to connect the each operational amplifier to a data signal channel in which the data signals are normally outputted, the second input terminal and the second output terminal are used to connect the each operational amplifier to an external circuit signal channel in which amplification is performed on the external circuit signals, the external circuit signals including reference voltages or external circuit signals other than the reference voltages; when the remaining (M−N) operational amplifiers exists in each of the source driver chips for the liquid crystal display, the data signal channel is disconnected in a program manner by a partial programmable logic circuit inside the source driver chip; the at least one of the remaining (M−N) operational amplifiers is connected to the external circuit signal channel through the second input terminal and the second output terminal, and used to amplify the at least one of the external circuit signals.