Anomalous-Pulsewidth Modulation of Single-Contact Light-Emitting Diode for Grayscale Control

Xiao, Tianyu; Wang, Kun; Li, Wenhao; Zhang, Yongai; Zhou, Xiongtu; Lin, Shanling; Lin, Zhixian; Guo, Tailiang; Wu, Chaoxing

doi:10.1109/ted.2023.3336290

Cited by 1 publication

(1 citation statement)

References 30 publications

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“…The digital PWM driving method is to divide one frame into some subframes, which can achieve accurate grayscale control since the PWM signal is generated by the peripheral circuit of the panel [12,13]. For the analog PWM driving method, the PWM control signal is generated by the comparison between the data voltage signal coupled with the sweep signal and the threshold voltage of PWM TFTs [14][15][16][17][18][19][20][21][22][23][24]. However, the PWM signal exists a long rising/falling time since the sweep signal voltage slowly cross the PWM TFT subthreshold region, resulting in image distortion especially in the low grayscale display.…”

Section: Introductionmentioning

confidence: 99%

An analog PWM pixel circuit with shaping function for low grayscale display of Micro-LEDs

Liu,

Zhou,

Zhou

et al. 2024

Eng. Res. Express

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This paper presents a new analog pulse width modulation (PWM) micro light-emitting diode(LED) pixel circuit with a shaping function. The rising/falling time of PWM signal generated by the proposed pixel circuit can be greatly reduced to improve the low grayscale display quality of micro-LED. Metal oxide thin film transistors with the top-gate (TG) coplanar structure are used to realize the proposed pixel circuit on the glass substrate. It is shown that the pulse width of micro-LED current can be linearly modulated by the data voltage.Furthermore, the measured rising time and falling time of the PWM signal are 15.6 μs and 25.5 μs, respectively, which are much smaller than that of the PWM signal in the conventional analog PWM pixel circuits.

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