Details

The Perceiva 3D Stereoscopic Display consists of the following major components:

Optical

1. A high intensity, high pressure, mercury vapor arc lamp used as a point light source (user field replaceable).
2. Optics system to convert the lamp energy into a highly collimated source of light impinging on the rear surface of the dual stacked, LCD sandwich.
3. A perfectly aligned pair of LCDs (H, V and rotation); the first one for color & intensity control, the second for polarization control.
4. An AR hard-coated front surface diffuser to spread the collimated light equally at all angles to enable viewing at extremely wide angles, > 160 degrees.
5. A pair of passive polarized viewing glasses matched to the display for proper viewing of the stereo image pair.  

Video

6. An OEM VGA_DVI-D video input board with BNC stereo frame sync input.
7. A proprietary video processing board for: (1) buffering the left-right stereo frames at 60 Hz, (2) detecting stereo frame sync, (3) calculating & storing of the dynamic sub-pixel look up table and (4) providing the output video stream & polarization data to the LCD stack.

Perceiva Display Technical Approach

The Perceiva display is similar to any conventional LCD monitor but consists of (1) a rear projection TV type of light source and optics to provide highly collimated light, (2) two matched LCD panels precisely bonded together, (3) a proprietary video processing computer and (4) a diffuser/AR glass viewing screen.

Most LCDs currently use a variety of diffuse light sources such as fluorescent for example.  However, this type of light will produce low stereo performance due to multiple adjacent pixel cross-talk (Neurok’s iZ3D display for example) along with other drawbacks.  The Perceiva uses a highly collimated light source similar to a conventional rear projection display as described next.

The Perceiva display assembly comprises a series of optical elements as noted further above in the “Optical” section.  From back to front, we have: a point light source, several mirrors and lens system to provide a source of highly collimated light, a polarized filter, the first LCD panel, a second polarized filter at 90 degrees to the first one, the second LCD panel, a thin sheet of quarter wave retarder, a diffuser laminated to an AR glass plate and finally, for proper viewing, a pair of polarized glasses matched to the system.

Contrary to other polarized stereoscopic systems that use only two angles of polarization, one for each eye, the Perceiva technology generates polarization at the proper angle for each and every sub-pixel of the display.  With this feature, it is possible to decompose a stereo-pixel (left/right) into a pixel-intensity controlled by the first LCD panel and a pixel-angle of polarization controlled by the second LCD panel.  The polarizer filters of the glasses will decompose the complex intensity-angle pixel back to left/right pixel information creating a nice stereo image with very little crosstalk.  Elliptical polarization is used to optimize the stereo performance using conventional twisted nematic (TN) LCD technology which rotates the light prior to entering the quarter wave retarder.  The passive polarized glasses are also “elliptical” to properly decode the light output from the display. 

The Perceiva DSD190 has been engineered to provide the best possible stereo performance for each eye with the following features: very wide viewing angle in all directions, excellent color fidelity, low weight, small footprint, single video input to avoid extra video cards or outputs and easy plug-and-play set up.
A version with dual DVI-I and dual VGA inputs is planned for availability in early Q1 2008.  This will enable users to be able to update the computer stored stereo data at 60 Hz per frame as well as provide a means of inputting real time video stereo through a camera interface system provided by the user.

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