基于脉冲宽度调制的p型低温多晶硅薄膜晶体管微发光二极管像素电路在元件波动下的稳健性研究

IF 3.7 3区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Information Display Pub Date : 2022-02-10 DOI:10.1080/15980316.2022.2029778
Jongsu Oh, Jin-Ho Kim, Eun Kyo Jung, Jongsul Min, Hwarim Im, Yong-Sang Kim
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引用次数: 4

摘要

在这项研究中,我们研究了采用脉冲宽度调制(PWM)的p型低温多晶硅(LTPS)薄膜晶体管(TFT)微发光二极管(µLED)像素电路在电路元件波动下的工作稳健性。通过实现PWM抑制了µled的波长漂移,这取决于电流密度。在仿真和测量结果中,PWM像素电路以恒定µLED电流控制发射时间。此外,在10位灰度范围内,波长位移被抑制在0.48%以下。此外,通过模拟不同阈值电压、迁移率、亚阈值摆幅和电容的µLED发射时间错误率,研究了像素电路的元件容差。在元件波动为±10%的情况下,像素电路具有良好的鲁棒性,最大错误率为4.0%。因此,采用PWM的µLED像素电路抑制了µLED的波长偏移,并在元件波动下表现出稳健的电路工作。
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Investigation on operation robustness of p-type low-temperature polycrystalline silicon thin-film transistor-based micro light-emitting diode pixel circuit using pulse width modulation under component fluctuation
In this study, we have investigated the operation robustness of a p-type low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT)-based micro light-emitting diode (µLED) pixel circuit adopting pulse width modulation (PWM) under circuit component fluctuations. The wavelength shift of µLEDs, depending on the current density, was suppressed by implementing PWM. The PWM pixel circuit controlled the emission time with constant µLED current in the simulated and measured results. In addition, the wavelength shift was suppressed below 0.48% within the 10-bit grayscale range. Furthermore, the component tolerance of the pixel circuit was investigated by simulating the error rate of µLED emission time with varying threshold voltage, mobility, subthreshold swing, and capacitance. The pixel circuit exhibited a robust operation with a maximum error rate of 4.0% under a component fluctuation of ±10%. Consequently, the µLED pixel circuit adopting PWM suppressed the wavelength shift of µLEDs and demonstrated robust circuit operation under component fluctuation.
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来源期刊
Journal of Information Display
Journal of Information Display MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.10
自引率
5.40%
发文量
27
审稿时长
30 weeks
期刊最新文献
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