The causes of the banding pattern in the images and the parameters of an optical system related to the banding contrast were studied to suppress the banding patterns that appeared in images displayed by a laser beam scanning system after a two-dimensional exit pupil expansion and to improve the display quality. Next, a method using dual-layered planar waveguide superposition was used to expand the exit pupil and suppress the banding contrast. According to the simulation, when the thicknesses of the dual-layered planar waveguide are 0.64 mm and 0.6 mm, respectively, the banding contrast of the pure color image displayed by the system decreases to 23.2% compared to single-layered waveguide system with thickness of 0.6 mm. This method can suppress the banding contrast and improve the display quality without significantly increasing the system volume or requiring complicated processing requirements. This method offers a solution by applying a laser beam scanning display to an augmented reality system.