Color autostereoscopic display

Details Color autostereoscopic display Color autostereoscopic display

1996-06-26

1998-10-20

Wu, Xiao

Computer graphics processing and selective visual display system

Single display system having stacked superimposed display...

Three-dimensional arrays

345 4, 345151, 348 51, G09G 500

Patent

active

058253378

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to three dimensional autostereoscopic displays. Such autostereoscopic displays can be made from a high frame rate two dimensional display and a device which makes the picture on the two dimensional display visible from different directions.
To display an autostereoscopic three dimensional image, a series of views of the object to be imaged are required. These might be captured by, for example, surrounding a solid object with an array of conventional cameras.
With such systems, each view in the series is put up on the two dimensional display in turn and made visible from a particular general direction. If the series is repeated quickly enough that the human eye perceives no flicker, the apparent effect is a display whose image content will depend on from where the human eye looks. By appropriate matching of view to direction of viewability, it is possible to recreate the three dimensional image on the display.
One way of making such a display is to use a cathode ray tube as the two dimensional display, and a lens and a shutter as the device which limits the field of view of the picture on the display.
The lens forms a virtual image of the cathode ray tube. The shutter, which reduces the field of view of the image, is positioned adjacent to the lens.
If the position of the aperture in the shutter can be changed rapidly, the angle from which the image can be seen may be varied as different pictures are presented in turn for display on the CRT screen. Each picture can be the view of some scene taken from a chosen viewpoint. So long as the picture for each direction is repeated sufficiently frequently, typically at least 50 Hz, and the shutter is stepped in sequence with the view on the CRT display, then different views will be seen from different positions and a three dimensional image will be observed. There are several alternative optical and image forming arrangements that are operationally equivalent to the description given above. Implementations can consist of 2 dimensional image forming devices made from an LCD or from a CRT. The shutter can be made from an LCD. The arrangement can place the shutter between the image forming device and the observer or can position the image forming device between the shutter and the observer. The light can be collimated or non-collimated. In a presently preferred implementation, the image forming device is a CRT and a viewing lens is added between the viewer and the shutter to narrow the pencils of rays passing through the aperture into near-parallel beams.
A number of devices for producing a colour 3D display employing the above principles have been proposed. One such way of making a colour three dimensional display is to have a colour CRT. However conventional colour CRT's are not bright because they incorporate shadow masks. Since the shuttering system absorbs a lot of light the CRT in this system needs to be bright, requiring a great deal of power, and brighter than available by current masking techniques.
Another way of making a colour three dimensional display is to use dichroic mirrors to combine the images from one red, one green and one blue CRT. The problem is that, at least in current three dimensional displays, the imaging lens is large, and there is little space for dichroic mirrors. Furthermore, it becomes necessary to register the CRTs so that the position of each pixel is the same on each CRT. The whole system is bulky, heavy and expensive because three times as many components are needed.
The bulk and expense of three CRT's can be avoided by using one CRT with a white phosphor, then filtering the emitted light so that rays of each of the primary colours are transmitted in turn. The disadvantages of this approach are that the CRT needs to operate three times faster than otherwise, it needs to be brighter than otherwise, and a filter which can switch between the primary colours is required.
A filter which switches between the primary colours has been made for a colour two dimensional display. It m

REFERENCES:
patent: 4758884 (1988-07-01), Roy
patent: 5132839 (1992-07-01), Travis
patent: 5589980 (1996-12-01), Bass et al.
patent: 5638082 (1997-06-01), Grimm

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