Autostereoscopic displays are a promising three dimensional display technology for its convenience and compatibility with current display systems which has attracted considerable attention. We describe in detail an autostereoscopic display system with full-parallax using a directional light-guide device with continuously variable spatial frequency sub-micron grating structures. The optimization process of parameters of the multi-direction light-guide is given. A method of implementing sub-micron grating pixels (SMGPs) based on an ultraviolet continuously variable spatial frequency photolithography process has been proposed. The process aims to provide low cost fabrication of variable spatial frequency grating pixels with high efficiency. We fabricate 2 inch backlight plate with nine viewing directions, and the pitch of each diffractive pixel varies between 441 nm and 578 nm. The properties of SMGPs are investigated by the measurement of diffraction efficiency dependence on viewing angle under a collimated 650 nm LED light source at an incidence angle of 60°. The variation of diffraction efficiency with regards to viewing angle is weak. The measured diffraction efficiency is around 6%, which is in good agreement with the simulated value.
Micro-nano optics and digital dot matrix hologram (DDMH) technique has been combined to code and fabricate glassfree 3D image. Two kinds of true color 3D DDMH have been designed. One of the design releases the fabrication complexity and the other enlarges the view angle of 3D DDMH. Chromatic aberration has been corrected using rainbow hologram technique. A holographic printing system combined the interference and projection lithography technique has been demonstrated. Fresnel lens and large view angle 3D DDMH have been outputted, excellent color performance of 3D image has been realized.
A polarizing color filter, combining the function of polarizer and color filter, is proposed and
theoretically investigated. The proposed color filter comprises of a metal grating and a dielectric layer
on a glass substrate. The influence of the geometrical parameters of dielectric layer on the transmission
efficiency are discussed in detail by rigorous coupled-wave analysis (RCWA). The result shows that a
dielectric layer of high equivalent refractive index can enhance its performance effectively. A optimum
tricolor filter with more than 74.1% broadband transmission and a polarization extinction ratio of
8.39dB is obtained.For TE-polarized light, it is reflected and can be recycled in the backlight units to
increase the total energy utility. The numerical result shows that the peak transmission efficiency can
increase 21.5% by using the proposed devices.
A novel subwavelength dual-layer metallic nanowire-grid polarizer is designed for visible region. The difference
between the designed and the available nanowire-grid polarizer is that the former adds a high refractive index dielectric
layer between the substrate and the dielectric grating. It is found that the high refractive index dielectric layer can
improve the performance of polarizer. Effects of the thickness of the high refractive index dielectric layer, the incident
angle and the duty cycle on the TM polarization transmission efficiency as well as the extinction ratios are analyzed
using rigorous couple-wave theory. Based on the simulation results, a polarizer with high TM transmission efficiency and
high extinction ratios over a wide incident angle is designed. It gives TM transmission efficiency over 79% and
extinction ratios higher than 56.6dB until the incident angle is