January 27th, 2011 by admin

All displays of this kind ( including Sony’s prototypes at the same show ) use parallax barrier technology, which basically produces “sections” around the TV where viewers can stand and experience a full on 3D effect. In our experience, the effect was maximised at dead center, and slight body movements often broke apart the 3D image. In other words, even if the first models were not discouragingly dear, you wouldn’t desire one in your living space anyhow. Not yet, at least. But the 3D TV which need glasses have advanced with the addition of passive glasses.

Active shutter glasses are heavy, costly, require batteries, and have to be in constant communication with an IR transmitter on top of the TV to stay in synchronization. They’ve been the standard for purchaser TVs up till now. Passive glasses are the same kind you use at a production theater when you go see a production like Avatar, and now, they come with some TVs. They are light-weight, cheap ( you can just about walk out of a theater with a pair ), don’t need batteries, and because they do not have to communicate with the TV at all, they’re universal. Your passive glasses will work with a friend’s TV.

On a technical level, active glasses work by flicking open and shut LCD lenses thousands of times per minute to make sure the right eyes receives photographs for the right eye, and vice versa. Passive glasses work with polarized lenses that correspond with the polarization of photographs shown on the TV. Besides making them much cheaper and lighter, this design also minimizes crosstalk.

Crosstalk happens when photographs intended for one eye unintentionally appear to both eyes, manufacturing a flickery, ghost-like image. The symptom usually springs from the basic imprecision of trying hard to get a couple of glasses and a TV to perform a coordinated dance of split-second maneuvers sixty times per second. It is not invariably going to be perfect. Since passive glasses are not subject to the same razer-slim margins for gaffe, they help decrease crosstalk.

In 2011, both LG and Vizio will be offering televisions with passive display technology — although not each single TV in their lines. LG will migrate all of its new 3D LCD TVs to passive tech, but all of its 3D plasmas will stay active. LG will offer passive technology on its flagship televisions, like its 65-inch Theater 3D edge-lit LED HDTV.

http://3dtvsets.co.uk