High-resolution compact reflective liquid crystal displays have been developed in recent years. The eyepiece optical
system is compact, but it remains difficult to achieve a very wide FOV using LCDs of this type. To achieve a wide FOV,
it is preferable to use an optical system in which an intermediate image is formed. However, this intermediate-image
system ends up making displays very large compared to those using the eyepiece optical system. To solve this problem,
we have developed a new optical system, called the "shuttle" optical system, in which a shuttle (bidirectional) optical
path is formed in a decentered FFS (free-form surface) optical system with an intermediate image. The shuttle optical
system allows the intermediate-image optical system to be compact. Through the use of this shuttle optical system as
well as electronic distortion-compensation, we have developed a
high-resolution SXGA compact video see-through
HMD with a high FOV of 76 degrees for mixed reality.
The HMD optical system composed of 'free form surface prism' (FFS prism) was presented by Canon Inc. at the 1996 SPIE conference. This prism was consists of aspherical surfaces without rotational symmetry. This HMD was suitable for compact HMD and was the 180,000 pixels display which has 34 degrees horizontal FOV and less than 15mm prism thickness. We have developed a new see-through 3D HMD with high resolution, wide field of view (FOV) by improving this FFS prism technique. The new HMD with 51 degrees horizontal FOV and large viewing eyebox shows clear full color image with 920,000 pixels. In spite of the wide FOV, the thickness of this new FFS prism is very thin, 17.9 mm. In this paper, we report this new HMD and 'the AR2 hockey system' as an example of this HMD application.
We have developed a prototype 3D Display system without any eyeglasses, which we call `Rear Cross Lenticular 3D Display' (RCL3D), that is very compact and produces high quality 3D image. The RCL3D consists of a LCD panel, two lenticular lens sheets which run perpendicular to each other, a Checkered Pattern Mask and a backlight panel. On the LCD panel, a composite image which consists of alternately arranged horizontally striped images for right eye and left eye, is displayed. This composite image form is compatible with the field sequential stereoscopic image data. The light from backlight panel goes through the apertures of the Checkered Pattern Mask and illuminates the horizontal lines of images for right eye and left eye on LCD and goes to the right eye position and left eye position separately by the function of the two lenticular lens sheets. With this principle, the RCL3D shows 3D image to an observer without any eyeglasses. We applied simulation of viewing zone, using random ray tracing to the RCL3D and found that illuminated areas for right eye and left eye are separated clearly as series of alternate vertical stripes. We will present the prototype of the RCL3D (14.5', XGA) and simulation results.
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