[其它] Adaptive Parallax Autostereoscopic LED Display

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发表于 2011-12-21 09:25:32 |只看该作者 |倒序浏览

Introduction

Autostereoscopic 3D displays using static parallax barrier or

lenticular lens are commercially available in these days. In these

methods, however, the number of viewpoints is fixed at the time

of manufacturing. Active parallax barrier [Perlin, 2000] and

dynamic parallax barrier [Peterka, 2008] have been proposed to

improve the resolution and number of viewpoints by moving the

position of the parallax barriers. To implement an

autostereoscopic display, with dynamic parallax barriers, duallayered

LCD panel is a common approach as is mentioned by

[Hirsch, 2010]. And a method of optimizing the parallax barriers

[Lanman, 2010] has been proposed to represent more

perceptually-acceptable imagery. Remaining limitations of the

dual-layered LCD method are the refresh rate and brightness of

the LCD panel. Commonly used high-speed LCD has 120Hz in

refresh rate and around 500cd/m2 in brightness so that

conventional systems did not have enough quality to be used in

public. To solve this problem, we propose an adaptive parallax

autostereoscopic display composed of a high-density/highfrequency

LED panel and a high-speed/high-contrast LCD panel.

Implementation

!!We implemented a novel 38inch high-density LED panel that has

240Hz refresh rate and 1500cd/m2 brightness. More than 160,000

full-color LEDs are arranged on the panel with 1.5mm pitch. A

moving image rendered on the basis of a particular parallax

barrier pattern is displayed on the LED display, and a 240Hz VA

type LCD panel with HD resolution, which works as dynamic

parallax barrier, is placed in front of the LED panel. The distance

between the LED panel and LCD panel is 45mm and both the

images on the LED and the LCD panels are displayed

synchronously. Consequently, appropriate rays of light are

delivered to each viewpoint as shown in Figure 2. As the barrier

pattern can be varies arbitrarily, the number and direction of

motion parallax can be flexibly controlled according to the

viewer’s condition.

Figure 3. (Left) Cons***ction of the 3D display using a LED

panel as light source and a LCD panel as dynamic parallax

barrier. (Right) Our developed high-density LED module

When a viewer stands in front of the display, the system

recognizes the rough position of the viewer’s head by a camera,

and then the viewpoints are densely arranged around the viewer’s

head so as to maximize the range of the horizontal motion

parallax. When the viewer lies down in front of the display, the

parallax would automatically changed to vertical. Further, when

there are multiple users in front of the display, the number and

angle of horizontal parallax would be changed according to the

distribution of the people. This proposed system enhances the

viewing style of 3DTV from individual use as gaming to public

use as digital signage.

References

Perlin, K., Paxia, S. and Kollin, J. 2000. An Autostereoscopic

Display. In Proc. of ACM SIGGRAPH 2000, pp. 319-326.

Peterka, T., Kooima, R. L., Sandin, D. J., Johnson, A., Leigh, J.,

DeFanti, T. A., 2008. IEEE Trans. on Visualization and

Computer Graphics, Vol. 14, No. 3, pp. 487-499.

Hirsch, M. and Lanman, D., 2010. Build your own 3D display, In

Proc. of ACM SIGGRAPH ASIA 2010 Courses, Article 16.

Lanman, D., Hirsch, M., Kim, Y., and Raskar, R., 2010. Content-

Adaptive Parallax Barriers: Optimizing Dual-Layer 3D

Displays using Low-Rank Light Field Factorization, ACM

Transactions on Graphics, Vol. 29, Issue 6, Article 163.