Displays and Projectors : Why do we need special 3D displays now when..

Why do we need special 3D displays now when..

We didn't need them in 1997 when ABC did their 3D week and NBC had that '3rd Rock' episode in 3D, We still need glasses for the new displays so what is the advantage in buying a 3DTV when a 15 year old CRT can do the same job?

Re: Why do we need special 3D displays now when..

Because those 3d presentations weren't *really* in 3D, or were severely compromised versions of it. The 3rd Rock episode utilized an optical illusion called the Pulfrich effect, which requires the camera and/or objects to keep moving laterally. ABC's 3D week utilized the good old anaglyph glasses--the colored lenses deal.

The new 3D HDTVs provide true stereoscopy--the program is shot using two cameras side-by-side to mimic the viewer's eyes; the left-hand image is sent to the left eye, the right-hand image is sent to the right eye.

There were actually similar solutions back in the day of SD CRT TVs, where one would buy special boxes that attached to DVD players that sent signals to big clunky electronic shutter glasses. The TV would display the left-hand image, and the glasses' right lens would go opaque so only the left eye would see it, then vice versa. The problem was, given CRT's nature, the images sent out were at 60Hz and field-sequential--meaning that, at best, the image was half the resolution of DVD, and flickered annoyingly.

Today's 3D HDTVs work on the same principle, except that instead of 60Hz, it's 240Hz--better than the refresh rate of most HDTVs--and at up to full HD resolution. So you get the crisp picture of Blu-ray AND in 3D to boot. No funky red and blue or green or magenta tinting, no additional constraints on the moviemakers as to how to plan their shots, no flickering. It's not as good as the stuff you get in movie theaters that utilize polarization and dual simultaneous projected images, but it's as good as it gets without dramatically increasing the price for the technology: you'll notice that 3D HDTVs basically cost as much as last year's mid-high end consumer models at $2K-$3K.

Just as HDTV was an improvement on SDTV, just as Blu-ray is an improvement over DVD, this is all about being BETTER. 3D HDTV is BETTER than any other previous home video solution for watching 3D programming. It's not "doing the same job." It's doing it BETTER.

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