单端注入型LED的光电特性与灰度调制技术研究

Research on photoelectric characteristics and grayscale modulation technology of single-terminal injection type LED

Micro-LED拥有出色的亮度、高发光效率、低能耗、高反应速度、超高解析度与色彩饱和度等优势,且具备自发光和感测能力,是一项十分理想的显示技术。传统的直流灰度调控方法不再适用于驱动单端载流子注入结构的交流型LED,本文根据单端注入型LED器件在不同频率、幅度、占空比以及交流驱动模式下的光电特性,提出一种基于人眼视觉特性的相对占空比混合式灰度调制方案。结果表明,正负方波驱动模式下的器件在相同电压和频率下表现出更强的发光亮度,并且器件随着驱动频率的增加,发光亮度逐渐提升。最后,结合人眼视觉特性,验证了发光器件在不同相对占空比、幅度、频率的混合式调制方法下实现了由2个灰度到8个灰度等级的提升,为未来新型发光器件灰度调制提供新思路。

Micro-LED has such advantages as excellent brightness,high luminous efficiency,low energy consumption,high response speed,ultra-high resolution and color saturation,and capability of lighting and sensing,which make it ideal display technology.The traditional DC grayscale control method is no longer suitable for driving the AC LED with singleterminal injection structure.According to the photoelectric characteristics of single-terminal injection LED under different frequency,amplitude,duty cycle and AC driving modes,a hybrid grayscale modulation scheme was proposed based on the human visual characteristics.The experimental results show that the device shows stronger luminous brightness in positive and negative square wave driving mode at the same voltage and frequency.And the luminous brightness of the device gradually increases at higher driving frequency.Finally,combined with the human visual characteristics,it is verified that the device could achieve eight grayscale levels versus previous two grayscale levels by hybrid modulation methods of different relative duty cycle,amplitude and frequency,which provides a new idea for grayscale modulation of new light-emitting devices in the future.