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