A multiview autostereoscopic LCD display with a localized 2D/3D switching function is developed based on the
actively switchable parallax barrier technology. This switchable barrier comprises of an electro-optically switchable
liquid crystal (LC) and a microretarder. Polymer dispersed liquid crystal (PDLC) with switchable clear and diffusing
states and twisted nematic liquid crystal (TNLC) with polarization switching function are used as switching devices. The
microretarder is prepared by self-developed multibeam laser scanning process, which is clean, friendly to the
environment, and easy for scale up and mass production. The influence factors on the image qualities of 3D displays
based on LCD panel technology are analyzed and discussed. Some solutions have proposed to solve the commercial
application issues.
A novel autostereoscopic display system, the Integrated-Screen autostereoscopic display system, has been developed to
substantially increase the total number of pixels on the screen, which in turn increase both the resolution and number of
view-zones of the 3D display. In this system, a series of miniature projectors are arrayed and the projection images are
tiled together seamlessly to form an image of ultra high resolution. For displaying 3D images, a lenticular screen with
pre-designed tilted angle is used to distribute the pixels into the plural view-zones. In this paper, an Integrated-Screen
autostereoscopic display system with 30" screen in diagonal and 15 view-zones is presented. The total resolution of the
tiled image is 2930×2700, which is much higher than traditional Full HD display, and the resulted 3D resolution in
each view-zone is 880×600.
For a spatial-multiplexed 3D display, trade-off between resolution and number of view-zones are usually unavoidable
due to the limited number of pixels on the screen. In this paper, we present a new autostereoscopic system, named as
"integrated-screen system," to substantially increase the total number of pixels on the screen, which in turn increase both
the resolution and number of view-zones. In the integrated-screen system, a large number of mini-projectors are arrayed
and the images are tiled together without seams in between. For displaying 3D images, the lenticular screen with predesigned
tilted angle is used for distributing different viewing zones. In order to achieve good performance, we design a
brand-new projector with special lens set to meet the low-distortion requirement because the distortion of the image will
induce serious crosstalk between view-zones. The proposed system has two advantages. One is the extensibility of the
screen size. The size of the display can be chosen based on the applications we deal with, including the size of the
projected pixel and the number of viewing zones. The other advantage is that the integrated-screen system provides
projected pixels in great density to solve the major problem of the poor resolution that a lenticular-type 3D display has.
An autostereoscopic display provides users great enjoyment of stereo visualization without uncomfortable and
inconvenient drawbacks of wearing stereo glasses. However, bandwidth constraints of current multi-view 3D display
severely restrict the number of views that can be simultaneously displayed without degrading resolution or increasing
display cost unacceptably. An alternative to multiple view presentation is that the position of observer can be measured
by using viewer-tracking sensor. It is a very important module of the viewer-tracking component for fluently rendering
and accurately projecting the stereo video. In order to render stereo content with respect to user's view points and to
optically project the content onto the left and right eyes of the user accurately, the real-time viewer tracking technique
that allows the user to move around freely when watching the autostereoscopic display is developed in this study. It
comprises the face detection by using multiple eigenspaces of various lighting conditions, fast block matching for
tracking four motion parameters of the user's face region. The Edge Orientation Histogram (EOH) on Real AdaBoost to
improve the performance of original AdaBoost algorithm is also applied in this study. The AdaBoost algorithm using
Haar feature in OpenCV library developed by Intel to detect human face and enhance the accuracy performance with
rotating image. The frame rate of viewer tracking process can achieve up to 15 Hz. Since performance of the viewer
tracking autostereoscopic display is still influenced under variant environmental conditions, the accuracy, robustness and
efficiency of the viewer-tracking system are evaluated in this study.
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