Novel DC drift compensation method for thin-film lithium niobate photonic integrated circuit for laser beam scanning imaging application

Thin-film lithium niobate (TFLN) has electro-optic property and has been attracting attention as a promising material for both high resolution and low power consumption in the field of display devices such as augmented reality (AR) and virtual reality (VR) in recent years. However, DC drift occurred in TFLN-based optical modulators which impedes display device application because it changes the color of the output light over time resulting in the color tone mismatch. In this study, a DC drift compensation method, which adds the compensation signal after image signal so that the average voltage is zero have been proposed. Over a 10s period, which is a sufficiently long period relative to the DC drift time constant, a maximum luminance variation of 0.55% is confirmed by using proposed method.