Threshold voltage compensation circuit of thin film transistor and method for the same, shift register, and display device

摘要

Provided are a threshold voltage compensation circuit of TFT and a method for the same, a shift register and a display device. The threshold voltage compensation circuit includes an input terminal, an output terminal connected to the source of the thin film transistor, a first resistor to a Kth resistor connected in series, and Kth connectable link and at least one first connectable link. Since a voltage dividing circuit having connectable links divides the voltage input to the source of the thin film transistor, such that the gate-source voltage of the thin film transistor can be changed by changing the voltage of the source of the thin film transistor when the voltage of the gate of the thin film transistor is maintained unchanged, so as to control a leakage current of the thin film transistor under a turn-off state, such that the thin film transistor can be turned off normally.

主权项

1. A threshold voltage compensation circuit of a thin film transistor, comprising a compensation module connected to a source of the thin film transistor;
wherein the compensation module comprises an input terminal, an output terminal connected to the source of the thin film transistor a first resistor to a Kth resistor connected in series, a Kth connectable link and at least one first connectable link, wherein K is a positive integer greater than 1; wherein the Kth connectable link corresponds to the Kth resistor and is disposed between the input terminal and the output terminal; the first connectable link is disposed between a node where a kth resistor and a (k+1)th resistor are connected in series and the output terminal, wherein k is a positive integer greater than or equal to 1 and less than or equal to K−1; and the first resistor to the Kth resistor are configured to divide a supply voltage input to the input terminal under controls of the Kth connectable link and at least one first connectable link so as to adjust a voltage applied to the source of the thin film transistor.