Circuit structure

A circuit structure, applied in a source driver circuit, the source driver circuit comprising a sample register and a digital-to-analog converter, the circuit structure being coupled between the sample register and the digital-to-analog converter, the circuit structure comprising:

• a multi-function switch circuit, having a positive input pole and a negative input pole, the multi-function switch circuit comprising:
• a first switch module, for selectively coupling an elevation voltage terminal to the positive output pole or the negative output pole;
• a second switch module, for selectively coupling a system ground terminal to the positive output pole or the negative output pole;
• and
• a third switch module, controlled by a positive input signal and a negative input signal from the sample register, for selectively coupling the positive output pole or the negative output pole to the system ground terminal;
• and
• a control module, comprising a fourth switch module coupled between the third switch module and the system ground terminal or coupled among the positive output pole, the negative output pole, and the third switch module, the control module selectively conducting or shutting down the fourth switch module according to a latch control signal to make the positive output pole and the negative output pole capable of coupling to the system ground terminal via the third switch module and the fourth switch module or floating;
• wherein when the control module conducts the fourth switch module according to the latch control signal, the third switch module controls output states of the positive output pole and the negative output pole according to the positive input signal and the negative input signal, if the positive input pole is at high voltage level and the negative input pole is at low voltage level, the multi-function switch circuit conducts the elevation voltage terminal to the positive output pole to output an elevation voltage output signal;
• if the positive input pole is at low voltage level and the negative input pole is at high voltage level, the multi-function switch circuit conducts the system ground terminal to the positive output pole;
• when the control module shuts down the fourth switch module according to the latch control signal, the first switch module and the second switch module are used for latching the voltage level of the positive output pole and the voltage level of the negative output pole.