Thin film transistor threshold voltage offset compensation circuit, goa circuit, and display

A compensation circuit for a threshold voltage drift of an output thin film transistor, including a first capacitor, a first switching unit, a charging signal, a first clock signal;

• wherein:
• the first capacitor includes a first electrode and a second electrode, the first electrode is connected to a gate of the output thin film transistor and receives the charging signal, the second electrode is connected to a drain of the output thin film transistor;
• and the first capacitor is used for ensuring the first electrode and the second electrode to have a same voltage under the control of the charging signal, such that a voltage difference between the drain and a source of the output thin film transistor is equal to the threshold voltage of the output thin film transistor;
• the first switching unit is connected to the drain and the source of the output thin film transistor respectively, and is turned on under the control of the first clock signal, such that the voltage difference between the gate and the source of the output thin film transistor is equal to the threshold voltage of the output thin film transistor;
• wherein the capacitance of the first capacitor is greater than the capacitance of the output thin film transistor and the capacitance of the first switching unit by a set value.

A GOA circuit for driving a row of pixels on an array substrate including:

• an output thin film transistor for controlling the output terminal of the GOA circuit to output an output signal,
• wherein the output thin film transistor is connected to the compensation circuit for threshold voltage drift of the output thin film transistor, and the voltage difference between a gate and a source of the output thin film transistor is equal to the threshold voltage thereof under the control of the compensation circuit, wherein
• the compensation circuit for a threshold voltage drift of the output thin film transistor, includes a first capacitor, a first switching unit, a charging signal, a first clock signal;
• wherein:
• the first capacitor includes a first electrode and a second electrode, the first electrode is connected to a gate of the output thin film transistor and receives the charging signal, the second electrode is connected to a drain of the output thin film transistor;
• and the first capacitor is used for ensuring the first electrode and the second electrode to have a same voltage under the control of the charging signal, such that a voltage difference between the drain and a source of the output thin film transistor is equal to the threshold voltage of the output thin film transistor;
• the first switching unit is connected to the drain and the source of the output thin film transistor respectively, and is turned on under the control of the first clock signal, such that the voltage difference between the gate and the source of the output thin film transistor is equal to the threshold voltage of the output thin film transistor;
• wherein the capacitance of the first capacitor is greater than the capacitance of the output thin film transistor and the capacitance of the first switching unit by a set value.

A display including the GOA circuit for driving a row of pixels on an array substrate, wherein,

• the GOA circuit for driving a row of pixels on an array substrate including:
• an output thin film transistor for controlling the output terminal of the GOA circuit to output an output signal,
• wherein the output thin film transistor is connected to the compensation circuit for threshold voltage drift of the output thin film transistor, and the voltage difference between a gate and a source of the output thin film transistor is equal to the threshold voltage thereof under the control of the compensation circuit, wherein
• the compensation circuit for a threshold voltage drift of the output thin film transistor, includes a first capacitor, a first switching unit, a charging signal, a first clock signal;
• wherein:
• the first capacitor includes a first electrode and a second electrode, the first electrode is connected to a gate of the output thin film transistor and receives the charging signal, the second electrode is connected to a drain of the output thin film transistor;
• and the first capacitor is used for ensuring the first electrode and the second electrode to have a same voltage under the control of the charging signal, such that a voltage difference between the drain and a source of the output thin film transistor is equal to the threshold voltage of the output thin film transistor;
• the first switching unit is connected to the drain and the source of the output thin film transistor respectively, and is turned on under the control of the first clock signal, such that the voltage difference between the gate and the source of the output thin film transistor is equal to the threshold voltage of the output thin film transistor;
• wherein the capacitance of the first capacitor is greater than the capacitance of the output thin film transistor and the capacitance of the first switching unit by a set value.