Today LG announced a 20" LCD display with built-in "eye tracking" technology that enables glasses-free 3D imaging which moves this technology closer to the consumer market. The image below does, as far as I can tell, not reveal any infrared illuminators, a requirement for all known systems with high accuracy so it's probably more of a rough estimation system than a full-blown remote system. Best known accuracy (published research) under natural light is about 3-4 degrees of angle, with their financial resources they could potentially achieve better results. 
Left. The "special" eye tracking camera sensor. Looks like a rather typical webcam CMOS sensor to me. Unless they are doing some magic it will not allow accurate gaze estimation. Regardless, makes me wonder if 3D displays is the path by which eye tracking goes mainstream? Is this related to the collaboration between Seeing Machines and SuperD announced earlier this year or just a competing solution? Details are sparse, I'll keep you posted as it becomes available. Official press release:
SEOUL, July, 13, 2011 – LG Electronics (LG) today unveiled the world’s first glasses-free monitor utilizing eye-tracking technology to maintain an optimal 3D image from a range of viewing angles. The 20-inch D2000 (Korean model: DX2000) monitor was developed as a fully functional entertainment display capable of reproducing games, movies and images in all their realistic glory.
“With a full line-up of 3D TVs, laptops, projectors and smartphones, LG Electronics is by far and away the industry leader in all things 3D.” said Si-hwan Park, Vice President of the Monitor Division at LG’s Home Entertainment Company. “LG’s position has always been that 3D will and must eventually function without glasses. The D2000 is a look at what the future has in store.”
The D2000’s 3D effect comes courtesy of glasses-free parallax barrier 3D technology, and the application of the world’s first eye-tracking feature to the monitor. The combination of parallax barrier and eye-tracking in a single unit promises to open up new horizons for glasses-free 3D products.
Existing glasses-free 3D technologies generally require viewers to stay within a tightly restricted angle and distance to perceive the 3D images. However, the D2000 has done much to resolve this issue, allowing viewer much freer movement and more comfortable viewing. Eye tracking in the D2000 works via a special camera sensor attached to the monitor which detects changes in the user’s eye position in real-time. With this information, the monitor calculates the angle and position of the viewer and adjusts the displayed image for the optimal 3D effect.
In addition to playing back existing 3D content, the D2000 has a highly refined 2D to 3D conversion feature which adds a new dimension to existing movies and game playing.
The D2000, available in Korea this month, will be introduced in other markets around the world in the latter part of 2011.
