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A Single Sweep Signal Enabled Analog PWM Pixel Circuit for Progressive-Emission Mode Active-Matrix Micro-LED Displays | IEEE Journals & Magazine | IEEE Xplore

A Single Sweep Signal Enabled Analog PWM Pixel Circuit for Progressive-Emission Mode Active-Matrix Micro-LED Displays


Abstract:

This letter introduces an analog pulse width modulation (A-PWM) pixel circuit for progressive-emission (PE) active-matrix micro light-emitting diode (AM \mu LED) displ...Show More

Abstract:

This letter introduces an analog pulse width modulation (A-PWM) pixel circuit for progressive-emission (PE) active-matrix micro light-emitting diode (AM \mu LED) displays, which is enabled by a single sweep signal instead of the conventional multiple sweep signals. The PE mode is implemented by double resetting the in-pixel comparator, thereby dividing one frame into two sub-frames, where each sub-frame contains one segment of the sweep signal, together forming a complete ramp waveform. The proposed pixel circuits were fabricated using amorphous indium gallium zinc oxide thin-film transistors (a-IGZO TFTs). Measurement results showed that the A-PWM pixel circuit can express gray levels in the PE mode, and the error rate is lower than 3.62% at 64 gray level even for a {V} _{\text {T}} shift of 2 V.
Published in: IEEE Electron Device Letters ( Volume: 46, Issue: 3, March 2025)
Page(s): 416 - 419
Date of Publication: 14 January 2025

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