P-174: Pulse Width Modulation IGZO Gate on Array Structure for OLED Driving

Abstract

A novel gate driver on array (GOA) circuit topology based on pulse width modulation (PWM) technique has been proposed for internal compensation AMOLED pixel driving. The output width of PWM GOA basic unit can be easily adjusted by tuning start pulse (STU) signal width. The performance of this circuit has been verified by simulation and the prototype has been fabricated in 5 inch AMOLED panel with IGZO TFT process. There are three main features of PWM GOA circuit, (1) PWM GOA is properly designed with depletion mode IGZO TFTs (2) Output pulse width can be easily changed by tuning STU's width without additional circuits (3) Interface and accessory of PWM GOA is custom designed to realize different function of each block. ThisGOA structure provides a practical way to realize narrow bezel design.

P‐48: Integrated a‐IGZO TFT Gate Driver with Programmable Output for AMOLED Display

“…However, almost all the conventional GOA schematics can only generate single pulses with fixed width [8]- [10], and are not capable of driving pixel circuits shown in Figure.1. Although, the output signals can be served as starting and resetting signals for the neighboring GOA stages with conventional circuits [11], the dynamic power consumption will be increased for the generation of complex waveforms.…”

“…Thus, it is important to develop a new circuit topology for GOA circuit of for AMOLEDs [12]. The GOA circuit proposed by Li et al can generate single pulses with programmable width [8]. And Cao et al reported a circuit that can produce outputs with programmable pulse width and number [9].…”