Method and device for detecting a threshold voltage drift of a transistor in a pixel circuit

A method for detecting a threshold voltage drift of a transistor in a pixel circuit, the pixel circuit comprises a switching transistor, a driving transistor, a detection transistor, and a storage capacitor;

• wherein the switching transistor has a gate electrically coupled to a first scanning terminal, a first electrode electrically coupled to a data voltage terminal, a second electrode electrically coupled to a first node;
• the driving transistor has a gate coupled to the first node, a drain coupled to a first voltage terminal, and a source electrically coupled to a second node;
• the detection transistor has a gate coupled to a second scanning terminal, a first electrode electrically coupled to the second node, a second electrode electrically coupled to a detection signal terminal;
• and the storage capacitor is electrically coupled to the first node and the second node;
• the method comprises:
• inputting, during an inputting stage, a first turning-on voltage to the second scanning terminal, so as to turn on the detection transistor, enabling writing a first voltage into the second node through the detection signal terminal;
• inputting, during a detection stage, a first turning-off voltage to the second scanning terminal, so as to turn off the detection transistor, and detect an actual voltage at the second node;
• and
• determining a state of the threshold voltage drift of a transistor to be detected according to the actual voltage and the first voltage, wherein the transistor to be detected comprises at least one of the driving transistor and the detection transistor;
• wherein the transistor to be detected is the driving transistor;
• the method further comprises:
• inputting, during a resetting stage previously before the inputting stage, a first control voltage to a first control voltage terminal so as to turn on the switching transistor, and a reset voltage to the data voltage terminal so as to output the reset voltage to the first node, thereby enabling the storage capacitor to be discharged and reset the second node;
• inputting, during the inputting stage, a first control voltage to a first control voltage terminal so as to turn on the switching transistor, and a first data voltage to the data voltage terminal so as to output the first data voltage to the first node;
• and
• inputting, during the detection stage, a first signal to the first scanning terminal, so as to enable the switching transistor to remain in a turned-on state;
• wherein the first data voltage is greater than the first control voltage, and the first voltage is greater than the first control voltage;
• the method further comprises:
• determining, that the threshold voltage of the driving transistor has a negative drift, if the actual voltage is less than the first voltage.