Reduction of short-time image sticking in organic light-emitting diode display through transient analysis of low-temperature polycrystalline silicon thin-film transistor

IF 3.7 2区工程技术 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE Displays Pub Date : 2024-07-09 DOI:10.1016/j.displa.2024.102794

Jiwook Hong , Jaewon Lim , Jongwook Jeon

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Abstract

Accurate compensation operation of low-temperature polycrystalline-silicon (LTPS) thin-film transistor (TFT) in pixel circuits is crucial to achieve steady and uniform luminance in organic light-emitting diode (OLED) display panels. However, the device characteristics fluctuate over time due to various traps in the LTPS thin film transistor and at the interface with the gate insulator, resulting in abnormal phenomena such as short-time image sticking and luminance fluctuation, which degrade display quality during image change. Considering these phenomena, transient analysis was conducted through device simulation to optimize the pixel compensation circuit. In particular, we analyzed the behavior of traps within LTPS TFT in correlation with compensation circuit operation, and based on this, proposed a methodology for designing a reset voltage scheme for the driver TFT to reduce the image sticking phenomenon.

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通过低温多晶硅薄膜晶体管的瞬态分析减少有机发光二极管显示屏的短时图像粘滞现象

低温多晶硅（LTPS）薄膜晶体管（TFT）在像素电路中的精确补偿操作对于实现有机发光二极管（OLED）显示面板的稳定和均匀亮度至关重要。然而，由于 LTPS 薄膜晶体管中以及与栅极绝缘体接口处存在各种陷阱，器件特性会随时间发生波动，从而导致短时图像粘连和亮度波动等异常现象，在图像变化时降低显示质量。考虑到这些现象，我们通过器件仿真进行了瞬态分析，以优化像素补偿电路。特别是，我们分析了 LTPS TFT 内陷阱的行为与补偿电路工作的相关性，并在此基础上提出了设计驱动 TFT 复位电压方案的方法，以减少图像粘连现象。

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来源期刊

Displays 工程技术-工程：电子与电气

CiteScore

4.60

自引率

25.60%

发文量

138

审稿时长

92 days

期刊介绍： Displays is the international journal covering the research and development of display technology, its effective presentation and perception of information, and applications and systems including display-human interface. Technical papers on practical developments in Displays technology provide an effective channel to promote greater understanding and cross-fertilization across the diverse disciplines of the Displays community. Original research papers solving ergonomics issues at the display-human interface advance effective presentation of information. Tutorial papers covering fundamentals intended for display technologies and human factor engineers new to the field will also occasionally featured.