Digital to analog converter, method for driving the same, and display device

A digital to analog converter, comprising:

• a first resistor string, 2m first multiplexers, a first voltage selector, a second resistor string, a second voltage selector, and a second multiplexer, wherein:
• the first resistor string comprises:
• 2m pairs of first resistors and first switches connected in series between a high-voltage reference signal terminal and a low-voltage reference signal terminal, wherein the first resistors have same resistance, and the first switches are initially turned on;
• and the 2m first resistors constitute (2m+1) first voltage dividing ends, the (2m+1) first voltage dividing ends one-to-one corresponding to (2m+1) input-output ends of the first voltage selector, wherein 2m first voltage dividing ends are one-to-one coupled with 2m input-output ends through the 2m first multiplexers, and the remaining one first voltage dividing end is coupled directly with the remaining one input-output end;
• the 2m first multiplexers are configured to connect the 2m input-output ends with control ends of their corresponding 2m first switches upon reception of a first control signal, and to connect the 2m input-output ends with their corresponding 2m first voltage dividing ends upon reception of a second control signal;
• the second resistor string comprises 2n second resistors connected in series between a high-voltage terminal of the first voltage selector and the second multiplexer, wherein a sum of the resistances of the 2n second resistors is equal to the resistance of a first resistor, and the 2n second resistors constitute 2n second voltage dividing ends;
• the second multiplexer is configured to connect a low-voltage terminal of the first voltage selector with ground upon reception of the first control signal, and to connect the low-voltage terminal of the first voltage selector with the second resistor string upon reception of the second control signal;
• the first voltage selector is configured to select one of the first switches to be turned off, according to a received m-bit digital signal when the low-voltage terminal is grounded, and to select the second resistor string, instead of the first resistor paired with the turned-off first switch, to be connected in series to the first resistor string, according to the received m-bit digital signal when the low-voltage terminal is connected with the second resistor string;
• and
• the second voltage selector is configured to select a voltage signal at one of the second voltage dividing ends for output, according to a received n-bit digital signal.