Goro Hamagishi

Step barrier system multiview glassless 3D display

The step barrier technology with multiple parallax images has overcome the problem of conventional parallax barrier system that the image quality of each image deteriorates only in the horizontal direction. The step barrier distributes the resolution problem both to the horizontal and the vertical directions. The system has a simple structure, which consists of a flat-panel display and a step barrier. The apertures of the step barrier are not stripes but tiny rectangles that are arranged in the shape of stairs, and the sub-pixels of each image have the same arrangement. And three image processes for the system applicable to computer graphics and real image have been proposed. Then, two types of 3-D displays were developed, 22-inch model and 50-inch model. The 22-inch model employs a very high-definition liquid crystal display of 3840 x 2400 pixels. The number of parallax images is seven and the resolution of one image is 1646 x 800. The 50-inch model has four viewing points on the plasma display panel of 1280 x 768 pixels. It can provide stereoscopic animations and the resolution of one image is 960 x 256 pixels. Moreover, the structural or electric 2-D 3-D compatible system was developed.

54.3: SXGA Non-Glasses 3-D Displays with New Image Splitter Head Tracking System

16″ and 18″ SXGA non-glasses 3-D displays are newly developed. Those displays are equipped with new head tracking system, consisting of electrically movable LC image splitter and CCD camera, which enlarges stereoscopic viewing area. Those displays are compatible with 2-D images by eliminating the effect of image splitter electrically.

Development of an autostereoscopic monitor and 2D-to-3D conversion for medical and surgical uses: requirements, clinical trials, and degree of acceptance

Previous attempts at popularizing stereoscopic devices for surgical use have been only minimally successful. In this paper, we point out what we perceive as past errors and misdirected designs. Although the perfect viewing medium has yet to be identified, certain basic principles and needs are summarized in order to enhance and promote acceptance of stereoscopic methods for surgical procedures, especially in the minimally invasive area. In addition, we present a newly developed autostereoscopic screen and accompanying 2D and 3D converter for medical/surgical use. A summary of the clinical testing performed and the degree of acceptance is also presented. Particular design requirements are unique to the surgical environment and these parameters are presented. The operator acceptance of the device and the value added requirements for stereoscopic endoscopic viewing are discussed.

Development of a color 3D display visible to plural viewers at the same time without special glasses by using a ray-regenerating method

We have newly developed a few kinds of new auto-stereoscopic 3D displays adopting a ray-regenerating method. The method is invented basically at Osaka University in 1997. We adopted this method with LCD. The display has a very simple construction. It consists of LC panel with a very large number of pixels and many small light sources positioned behind the LC panel. We have examined the following new technologies: 1) Optimum design of the optical system. 2) Suitable construction in order to realize very large number of pixels. 3) Highly bright back-light system with optical fiber array to compensate the low lighting efficiency. The 3D displays having wide viewing area and being visible for plural viewers were realized. But the cross-talk images appeared more than we expected. By changing the construction of this system to reduce the diffusing factors of generated rays, the cross-talk images are reduced dramatically. Within the limitation of the pixel numbers of LCD, it is desirable to increase the pinhole numbers to realize the realistic 3D image. This research formed a link in the chain of the national project by NEDO (New Energy and Industrial Technology Development Organization) in Japan.

A High-Intensity Flat Vacuum Fluorescent Lamp.

A high-intensity flat vacuum fluorescent lamp utilizing cathode-luminescence has been developed for LCD backlighting. The apparatus used was a glass vessel consisting of two concave-shaped pieces of glass with two mesh-shaped grid electrodes and the line cathodes fixed at the solder glass fritting seal section between the front and rear pieces of glass. The lamp consists of tetrode. The glass vessel is made of Barium-Strontium glass, so that a high voltage can be applied to the anode and so that a high luminous efficiency can be obtained. As we adopt an interference filter and a liquid-cooling system to add high power to the phosphor layer, this lamp can produce an intensity of 70, 000 cd/m2 (Green). Moreover, excellent results concerning brightness uniformity, brightness control and temrperature stability are also obtained.This lamp is expected to be used for LCD backlighting of LC projectors and for head-up displays of cars and planes.