Extended-Depth Light Field Display Based on Controlling-Light Structure in Cross Arrangement

Abstract

AbstractDespite the light field display with many advantages is considered as one of the most potential three-dimensional display technologies, the limited depth range is common drawback which restricts its applications. Small depth of focus (DOF) caused by diffraction is one of the reasons those limit the display depth range. Here, the proposed method extends the display depth range by enlarging DOF of the lens. In order to verify the feasibility of the method, a 32-inch three-dimensional light-field display system based on the controlling-light structure in cross arrangement and holographic functional screen (HFS) is demonstrated. Two extended DOFs are superposed to form the extended depth due to the controlling-light structure in cross arrangement combined by lenslet array and aperture array. The function of HFS is to modulate and rebuild the light field distribution so as to eliminate the gaps between the adjacent lenslets and increase the fill factor of the controlling-light structure. In terms of contrast experiments, the depth range of the improved display system is extended effectively, which is extended from 6 cm to 13 cm on the premise of the 40° horizontal and vertical viewing angle and acceptable resolution.KeywordsLight field displayDepth rangeControlling-light structure