A frameless multi-view display module that consists of an array of microelectromechanical system (MEMS) based projectors, a sparse lenticular lens, and a vertical diffuser is proposed to provide a large-screen autostereoscopic display. The projectors are positioned in a horizontal vector form or in a matrix form in front of the transfer screen in order to produce the same number of three-dimensional (3D) pixels in each cylindrical lens constituting the lenticular lens to increase the horizontal resolution of the module. The projectors generate a slanted two-dimensional array of dots on the vertical diffuser to provide a large number of viewpoints. The experimental display system was constructed using four projectors. The system had a 3D resolution of 160 × 120, and it provided 64 views. The screen size was 14.4 in.
Several kinds of micro optics array have been developed to form aerial images in the mid-air, and we propose evaluation methods for imaging performance of the optical system using the micro optics array. To evaluate the influence caused by aperture limitation of micro optics array and diffraction, the MTF measurement method using a knife edge has been improved considering the viewing direction/angle dependence.
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