Reference voltage generating circuit and display device

A reference voltage generating circuit, comprising:

• a timing control circuit;
• a memory for providing a digital voltage signal;
• a digital-to-analog conversion circuit , provided with n voltage signal input terminals and n voltage signal output terminals, wherein the n voltage signal input terminals of the digital-to-analog conversion circuit are all connected to a signal transmission terminal of the memory, the digital-to-analog conversion circuit is for receiving the digital voltage signal output by the memory, converting the digital voltage signal into an analog voltage signal, and outputting the analog voltage signal;
• an operational amplifier circuit;
• a drive circuit;
• a switch control circuit, provided with a first signal input terminal, n second signal input terminals, n first signal output terminals and n second signal output terminals, wherein the first signal input terminal of the switch control circuit is connected to a frame signal output terminal of the timing control circuit, the n second signal input terminals of the switch control circuit are all connected to a clock signal output terminal of the timing control circuit;
• upon receiving a frame start signal output by the frame signal output terminal of the timing control circuit, and receiving a clock signal output by the clock signal output terminal of the timing control circuit, the switch control circuit is for outputting a high-level control signal from one of the n first signal output terminals, and outputting a low-level control signal from one of the n second signal output terminals;
• a first switch circuit, provided with n first input terminals, n first controlled terminals and n first output terminals, wherein the n first input terminals of the first switch circuit are connected to the n voltage signal output terminals of the digital-to-analog conversion circuit in a one-to-one correspondence, the n first controlled terminals of the first switch circuit are connected to the n first signal output terminals of the switch control circuit in a one-to-one correspondence, the n first output terminals of the first switch circuit are all connected to an input terminal of the operational amplifier circuit;
• upon receiving the analog voltage signal output by the digital-to-analog conversion circuit, and receiving the high-level control signal output by the switch control circuit, the first switch circuit is for outputting the analog voltage signal from one of the n first output terminals to the operational amplifier circuit;
• and
• a second switch circuit, provided with n second input terminals, n second controlled terminals and n second output terminals, wherein the n second input terminals of the second switch circuit are all connected to an output terminal of the operational amplifier circuit, the n second controlled terminals of the second switch circuit are connected to the n second signal output terminals of the switch control circuit in a one-to-one correspondence, the n second output terminals of the second switch circuit are all connected to the input terminal of the drive circuit;
• upon receiving the analog voltage signal transmitted by the operational amplifier circuit, and receiving the low-level control signal output by the switch control circuit, the second switch circuit is for outputting the analog voltage signal from one of the second output terminals of the n second output terminals to the drive circuit, n is an integer greater than or equal to 1.

A display device, comprising a reference voltage generating circuit and a display panel, a drive circuit of the reference voltage generating circuit being connected to the display panel, wherein the reference voltage generating circuit includes:

• a timing control circuit;
• a digital-to-analog conversion circuit, provided with n voltage signal output terminals, and for providing an analog voltage signal;
• an operational amplifier circuit;
• a drive circuit;
• a switch control circuit, provided with a first signal input terminal, n second signal input terminals, n first signal output terminals and n second signal output terminals, wherein the first signal input terminal of the switch control circuit is connected to a frame signal output terminal of the timing control circuit, the n second signal input terminals of the switch control circuit are all connected to a clock signal output terminal of the timing control circuit;
• upon receiving a frame start signal output by the frame signal output terminal of the timing control circuit, and receiving a clock signal output by the clock signal output terminal of the timing control circuit, the switch control circuit is for outputting a high-level control signal from one of the n first signal output terminals, and outputting a low-level control signal from one of the n second signal output terminals;
• a first switch circuit, provided with n first input terminals, n first controlled terminals and n first output terminals, wherein the n first input terminals of the first switch circuit are connected to the n voltage signal output terminals of the digital-to-analog conversion circuit in a one-to-one correspondence, the n first controlled terminals of the first switch circuit are connected to the n first signal output terminals of the switch control circuit in a one-to-one correspondence, the n first output terminals of the first switch circuit are all connected to an input terminal of the operational amplifier circuit;
• upon receiving the analog voltage signal output by the digital-to-analog conversion circuit, and receiving the high-level control signal output by the switch control circuit, the first switch circuit is for outputting the analog voltage signal from one of the n first output terminals to the operational amplifier circuit;
• and
• a second switch circuit, provided with n second input terminals, n second controlled terminals and n second output terminals, wherein the n second input terminals of the second switch circuit are all connected to an output terminal of the operational amplifier circuit , the n second controlled terminals of the second switch circuit are connected to the n second signal output terminals of the switch control circuit in a one-to-one correspondence, the n second output terminals of the second switch circuit are all connected to the input terminal of the drive circuit;
• upon receiving the analog voltage signal transmitted by the operational amplifier circuit, and receiving the low-level control signal output by the switch control circuit, the second switch circuit is for outputting the analog voltage signal from one of the second output terminals of the n second output terminals to the drive circuit, n is an integer greater than or equal to 1;
• wherein the switch control circuit includes n triggers connected in sequence, clock signal input terminals of the triggers are the second signal input terminals of the switch control circuit, first data output terminals of the trigger are the first signal output terminals of the switch control circuit, second data output terminals of the triggers are the second signal output terminals of the switch control circuit, a data input terminal of a trigger located in a first position is the first signal input terminal of the switch control circuit, and is connected to a first data output terminal of a trigger located in a last position;
• and
• in two adjacent triggers, a first data output terminal of a trigger located in a previous position is connected to a data input terminal of a trigger located in a next position;
• when any first signal output terminal of the switch control circuit outputs a high-level control signal, other n-1 first signal output terminals all output a low-level control signal, and when any second signal output terminal of the switch control circuit outputs a low-level control signal, other n-1 second signal output terminals all output a high-level control signal.