A typical light field virtual reality head-mounted display (VR HMD) is comprised of a lenslet array and a display for each eye. An array of tiled subobjects shown on the display reconstructs the light field through the lenslet array, and the light field is synthesized into one image on the retina. In this paper, we present a novel compact design of binocular spatially multiplexed light field display system for VR HMD. Contrary to the flat lenslet array and flat display used in current light field displays, the proposed design explores the viability of combining a concentric curved lenslet array and curved display with optimized lenslet shape, size and spacing. The design of placing lenslet array on a spherical surface is investigated and the specification tradeoffs are shown. The system displays highest resolution at the direction wherever the eye gazes. The design form is thin and lightweight compared to most other VR optical technologies. Furthermore, the use of a curved display reduces the complexity of optical design and wastes fewer pixels between subobjects. The design simultaneously achieves a wide field of view, high spatial resolution, large eyebox and relatively compact form factor.
A smart glass augmented reality (AR) display system is designed with a streamlined form factor featuring an off-axis mirror design. The main component of the combiner optics is in the shape of a regular pair of eyeglasses or sunglasses, with no diffractive gratings, waveguides (lightguides), prisms or Fresnel surfaces involved. High quality see-through performance is achieved with a low-cost combiner that consists of only highly manufacturable reflective surfaces. The 20-degree full field of view of the AR display is centered at about 30 degrees with respect to the center of the ocular vision. Such a design allows the user to have a clear unobscured central field of view. At the same time, the projected image is accessible by moving the eyeball off the central vision. The system is designed with a circular eye box with more than 10 mm in diameter.
Discrete zoom systems are commonly used as laser beam expanders and infrared zoom lenses. The reason to design a
discrete zoom lens is that they are often a desirable compromise between fixed-focal length lenses and continuous zoom
lenses, offering many advantages to imaging systems of all types. They have the advantage over continuous zoom systems
for containing fewer elements, thus reducing the weight of the system, and having one mechanical motion instead of two.
In literature there is little information on the first order parameters and starting requirements for discrete systems. This
work derives the first order equations for two different discrete zoom systems. The equations are derived from the
requirements of first order parameters which define the starting group focal lengths. The two design configurations studied
are: one zoom group flipping in and out of the system; one zoom group moving laterally along the optical axis. This work
analyzes the first order equations for both configurations and discusses the starting point for the designs taking into
consideration system limitations. Final designs for both configurations are then compared over several parameters: group
focal lengths, lens diameters, overall length, number of elements, materials, and performance.