Novel TFT-Based emission driver in high performance AMOLED display applications

摘要

A novel integrated row driver for emission control with n-type thin-film transistors (TFTs) was proposed. A single stage of the proposed driving circuit consists of charge supplement unit, improved inverter, and power conservation unit besides input TFT and driving TFTs. Simulations were carried out with fabricated LTPS TFT. The results show the driving circuit achieves leakage prevention with no floating state and high reliability even under the Vth shift of 3 V. What's more, further measurement results show a 3 μs pulse width can be generated by the circuit, supporting 8k4k resolution with high refresh rate of 120 Hz. And the capability of low refresh rate (1 Hz) driving also can be achieved without degradation. In addition, only three control signals (two non-overlap clocks and one input signal) are used in the proposed circuit, where input signal of present stage is connected with the output of its previous stage. That means the row driver can work under independent control and be not susceptible, which contributes to generating adjustable pulse width for pulse width modulation (PWM) in active matrix organic light-emitting diode (AMOLED) displays.