T-Glasses is LetinAR’s truly eyeglasses-shaped lightweight augmented reality device which uses plastic optical combiners. Thanks to its unique PinTILT (Total Internal reflection minimized Lightguide Technology) structure, it shows moderate optical manufacturing tolerance allowing injection molding suitable for low-cost mass production. In this talk, Dr. Park introduces the latest advancement of PinMR (Pin Mirror) optical structure: PinTILT, and how it can minimize the number of total internal reflections by adopting a modified birdbath structure, which results in the minimal form factor of AR glasses.
In this paper, we propose the see-through parallax barrier type multi-view display with transparent liquid crystal display
(LCD). The transparency of LCD is realized by detaching the backlight unit. The number of views in the proposed
system is minimized to enlarge the aperture size of parallax barrier, which determines the transparency. For
compensating the shortness of the number of viewpoints, eye tracking method is applied to provide large number of
views and vertical parallax. Through experiments, a prototype of see-through autostereoscopic 3D display with parallax
barrier is implemented, and the system parameters of transmittance, crosstalk, and barrier structure perception are
analyzed.
Autostereoscopic (glasses-free) displays provide perspectives of images according to the position of the observer. This book introduces various autostereoscopic technologies, from the fundamental principles of the parallax-barrier method to the latest multi-projection, super multi-view displays. Display basics and fundamentals of 3D displays are presented first, followed by descriptions of multi-view system configurations. Because the technological advancement of conventional 2D display affects the development of 3D displays, the book also covers the basics of 2D displays, including flat panel and projection-type displays. For readers with some knowledge of 3D display technologies, detailed explanations of advanced display technologies such as the slanted lens technique and multi-projection system are also included. The book is suitable for readers ranging from undergraduate students to display manufacturers in the industry.
We propose a compact multi-projection system based on integral floating method with waveguide projection. Waveguide projection can reduce the projection distance by multiple folding of optical path inside the waveguide. The proposed system is composed of a wedge prism, which is used as a waveguide, multiple projection-units, and an anisotropic screen made of floating lens combined with a vertical diffuser. As the projected image propagates through the wedge prism, it is reflected at the surfaces of prism by total internal reflections, and the final view image is created by the floating lens at the viewpoints. The position of view point is decided by the lens equation, and the interval of view point is calculated by the magnification of collimating lens and interval of projection-units. We believe that the proposed method can be useful for implementing a large-scale autostereoscopic 3D system with high quality of 3D images using projection optics. In addition, the reduced volume of the system will alleviate the restriction of installment condition, and will widen the applications of a multi-projection 3D display.
KEYWORDS: Polarizers, Scattering, Light scattering, 3D image processing, Polarization, 3D displays, Linear polarizers, Projection systems, Integral imaging, 3D volumetric displays
A bi-directional 2D/3D convertible integral imaging system is proposed. Two optical modules composed of a scattering
polarizer and a linear polarizer are adopted, and 2D or 3D mode operation is easily changed by converting polarization
states of the projected images. In the 2D mode, the incident light is scattered at the scattering polarizer and the scattered
light facing the lens-array is blocked, a 2D image is observable only at the same side as the projector. In the 3D mode,
the incident light with the transmission polarization is directly projected onto a lens-array, and the 3D images are
integrated. Our proposed system is able to display the 3D images as well as the 2D images for the observers who are
placed in front and rear side of the system.
We propose novel depth-fused three-dimensional (DFD) method using polarization distribution, which is one kind of
multifocal plane display that provides autostereoscopic image with small visual fatigue. The DFD method is based on the
characteristic of human depth perception when the luminance-modulated two-dimensional (2D) images are overlapped.
The perceived depth position is decided by the luminance ratio of each plane. The proposed system includes the
polarization selective scattering films and the polarization modulating device. The polarization selective scattering film
has the characteristics of partial scattering according to the polarization state and transmits the rest light from the
scattering. When the films are stacked with the scattering axis rotated, each layer of film provides different scattering
ratio according to the incident polarization. Consequently, the appropriate modulation of polarization can provide DFD
image through the system. The depth map provides depth information of each pixel as a gray scale image. Thus, when a
depth map is displayed on a polarization modulating device, it is converted into a polarization distributed depth map. The
conventional twisted nematic liquid crystal display can be used as a polarization modulating device without complicated
modification. We demonstrate the proposed system with simple experiment, and compare the characteristic of the system
with simulated result.
KEYWORDS: LCDs, 3D image processing, 3D displays, Integral imaging, 3D image enhancement, Imaging systems, Polarization, 3D vision, Scattering, 3D image reconstruction
We propose 2D/3D convertible display system with enhanced 3D viewing angle based on integral imaging. We use 3
LCD devices and a lens array in the proposed system. The LCD device 1is used for displaying an elemental image which
turn into a 3D image through the lens array. The LCD device 2 is used as a polarization switcher to control the
transparent and the opaque region of elemental image. The LCD device 3 is used as both mask pattern and 2D image
displaying device. On the back glass of LCD device 3, we attach polarization-selective scattering film which makes LCD
device 3 used as a mask pattern and a 2D display device at the same time. Behind of the LCD device 3, the lens array is
located for displaying 3D image by the integral imaging method. The whole system is as compact as conventional
integral imaging system. With the LCD device 2 and 3, the viewing angle of 3D image can be enhanced both vertically
and horizontally according to the arrangement of elemental image. We prove the feasibility of proposed system by basic
experiments.
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