Invited; Circuit architecture and pixel array driving methods for AMOLED and Mini/Micro-LED displays


Chih-Lung Lin

Conference Dates

May 15-18, 2023


This work contributes to our recent efforts in thin-film-transistor-based (TFT-based) pixel circuits and driving schemes for active-matrix organic light-emitting diode (AMOLED) and mini/micro-light-emitting diode (mini/micro-LED) display technologies. The pixel circuits incorporating the specific benefits of various driving methods are presented. For application in high-resolution mobile AMOLED displays, a new 6T2C pixel circuit using low-temperature polycrystalline silicon (LTPS) TFTs is proposed. Adopting a parallel addressing scheme extends the effective compensation times for operating threshold voltage (VTH) compensation in the pixel circuit. The effectiveness of the VTH compensation is confirmed that displayed red, green, and blue images with long compensation times are more uniform than that with short compensation times. Therefore, the proposed pixel circuit is suitable for use in high-resolution AMOLED displays. Mini/micro-LED displays with self-emission, high brightness, and long lifetime are promising for a new generation. However, cost and driving schemes remain barriers to real product applications. Recent advancements in pulse-width modulation (PWM) driving methods are proposed for mini/micro-LED displays.

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