Enhancement of picture quality on ultra-low brightness by optimizing the electrical potential required for OLED charging in the AMOLED displays

IF 3.7 3区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Information Display Pub Date : 2021-05-28 DOI:10.1080/15980316.2021.1923581
Sehwan Na, Won Kyung Min, Do Hyung Kim, H. Hwang, Yong‐Min Ha, Hyun Jae Kim
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引用次数: 6

Abstract

The principal causes of the poor picture quality on active matrix organic light-emitting diode (AMOLED) displays, operating under extremely low brightness and gray-scale conditions, were analyzed and verified by measuring and modelling of the electrical simulations. Through the analysis, it was found that the deteriorated picture quality was induced by a delayed saturation voltage, which means the electric potential difference between the initial voltage applied to the anode of the OLED (Vinit) and the OLED saturated voltage (Vsat) for emission. This is because the deviations of pico-ampere-level currents and delayed OLED charging prior to light emission increased the saturation voltage when there were low driving currents. Thus, we optimized the voltage by increasing Vinit from −4.5 to −2.7 V, effectively eliminating image deterioration by reducing the OLED charging delay. Thus, the proposed approach opens up advancements of obtaining superior picture quality with ultra-low luminance, even in the dark illuminance environments. We discuss how OLED picture quality may be enhanced under low brightness, including the driving methods, design considerations, and processes involved.
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通过优化AMOLED显示器中OLED充电所需的电势,在超低亮度下增强图像质量
通过电模拟的测量和建模,分析并验证了在极低亮度和灰度条件下工作的有源矩阵有机发光二极管(AMOLED)显示器画面质量差的主要原因。通过分析发现,劣化的图像质量是由延迟的饱和电压引起的,这意味着施加到OLED阳极的初始电压(Vinit)和用于发射的OLED饱和电压(Vsat)之间的电势差。这是因为当存在低驱动电流时,微微安培电平电流的偏差和发光之前延迟的OLED充电增加了饱和电压。因此,我们通过将Vinit从−4.5增加到−2.7来优化电压 V、 通过减少OLED充电延迟来有效地消除图像劣化。因此,即使在暗照度环境中,所提出的方法也能以超低亮度获得卓越的图像质量。我们讨论了如何在低亮度下提高OLED的画质,包括驱动方法、设计注意事项和相关工艺。
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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
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