A new gate driver employing linearly sweep signal generated module for high-resolution micro-LED display with line-by-line pulse width modulation driving method

A new gate driver with metal oxide thin-film transistors (MO-TFTs) has been presented for micro-light-emitting diode (Micro-LED) display. The proposed gate driver employing linearly decreasing sweep signal generated module could realize the line-by-line pulse width modulation (PWM) driving method, which is valuable for application in high-resolution Micro-LED display compared with the conventional driving method employing global sweep signal. A simple Micro-LED pixel circuit including an inverter module driven by the analog PWM method is employed to demonstrate the feasibility of the proposed gate driver. A 10 × 10 green Micro-LED display array has been fabricated with MO-TFTs backplane technology. It is shown that a 10-μs width pulse and linearly scanning sweep signal can be successfully output. Consequently, the pixel circuit array can be driven properly under analog line-by-line PWM driving method.