Mini-LED Pixel Circuit Reset Module for Threshold Voltage Drift

The patent applies preliminary anti-action by introducing a reset module that outputs a reset signal with opposite polarity to the data signal. This reset signal is written to the gate of the driving transistor in a reset stage before the data signal writing stage, creating a preliminary counteracting effect that neutralizes the forward bias stress before it can cause significant threshold voltage drift. The reset module includes a reset transistor and capacitor that generate and store the reset signal with magnitude equal to or greater than the data signal magnitude but with opposite polarity.

The patent changes the electrical parameters of the driving transistor gate by introducing a reset signal that alters the gate voltage from the data signal voltage (Data_H) to a reset voltage (Reset_H) with opposite polarity. This parameter change is achieved by controlling the reset transistor to connect the gate to the reset voltage source, thereby changing the operating point of the transistor to counteract the bias stress effect.

The patent implements periodic action by alternating between reset signal writing stages and data signal writing stages. The display refresh cycle is divided into distinct phases: a reset stage where the reset signal is written to the gate, followed by a data signal writing stage. This periodic switching between opposite polarity voltages prevents the gate from remaining at high potential continuously, thereby reducing the cumulative bias stress while maintaining operational control.

The reset signal writing is performed as a preliminary action before the data signal writing in each refresh cycle. By first establishing the gate voltage at the reset potential with opposite polarity, the system prepares the driving transistor to withstand the subsequent data signal application without excessive threshold voltage drift, effectively pre-conditioning the transistor for stable operation.