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

    Yuxuan Zhu,Congwei Liao, Lingxiao Qian,Shengdong Zhang

    IEEE Electron Device Letters（2025）

    School of Electronic and Computer Engineering

    Cited 0|Views8
    Abstract
    This letter introduces an analog pulse width modulation (A-PWM) pixel circuit for progressive-emission (PE) active-matrix micro light-emitting diode (AMμLED) 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 VT shift of 2 V.
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    Key words
    Micro light-emitting diode (μLED),analog pulse width modulation (A-PWM),progressive-emission mode,thin-film transistor (TFT)
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