3D display system uses eye-tracking to orient pixels, needs no glasses

June 03, 2014 // By Graham Prophet
Tianma NLT America (TNAM) has announced the development of a new autostereoscopic display system by NLT Technologies (NLT) that optimises parallax from an arbitrary viewpoint to reduce the influence of 3D-crosstalk and display motion parallax.

This 3D eye-tracking system achieves smooth and realistic 3D images, without the use of glasses, by combining NLT’s proprietary 3D image processing engine, called “Truly Realistic 3D imaging” (TR3i-2), with the company’s high density autostereoscopic display method called “Horizontally x Density Pixels” (HxDP), along with an eye-tracking device that detects the observer’s eye position with a high level of accuracy.

Recently, the company says, the demand for autostereoscopic displays has been growing not only for use in consumer games, smart phones, and televisions, but also in professional applications such as medical and educational equipment. This is attributed to the increasing opportunity to use high quality autostereoscopic images, which create a sense of depth, due to the increasing use of stereo cameras in certain applications such as in endoscopic instruments. The industrial market has also recognised the value of 3D technology for various applications. However, there have been some issues that limit the value of 3D technology, such as ghost images, image reversal, and the limitation of suitable 3D viewing space.

To address these issues, increasing the number of viewing points on a multi-view autostereoscopic display will broaden the suitable viewing space and reduce image reversal. However, increasing the number of viewing points also decreases the density of the 3D image. So, it is difficult to both minimise image reversal and achieve a high density 3D image. NLT claims to have resolved this dilemma without using a multi-view 3D display – using only a 2-view 3D display with HxDP technology, the 3D image processing engine called “TR3i-2”, and an eye-tracking device. This system monitors the observer's eye positions, and varies binocular parallax based on the viewing angle without decreasing the density of the 3D image.

The TR3i-2 converts stereo images, optimised for the characteristics of the autostereoscopic display, to correspond to the observer’s eye position, which is detected by the eye-tracking device. With TR3i-2, it is now possible to provide 3D