Structure factor design of a liquid crystal beam steering device for augmented reality applications

Abstract

The applications of AR and VR devices have been increasingly important in our daily life. There are some disadvantages remaining to be improved for real time application. In this paper, we demonstrated the design of an experiment based on the Taguchi method targeting a beam steering liquid crystal device possessing a 6 degree steering angle with fast switching (>60Hz) ability for viewing angle expansion in AR/VR devices. The approach of the best structure design was suggested from the recall table that concluded the optical phenomenon was affected by the selected parameters from simulation. The resulting design rule was a tape-out design to prepare the pattern ITO glass. The beam steering device was assembled according to the suggested cell gap. The device evaluation showed a 6.1 degree steering angle as predicted. The response time was measured as 10.5 ms, which is able to be driven well above 60 Hz.