CurtPalme.com Home Theater Forum

[CIR Engineering]

[Nashou66]

Craig you need to get a demo unit from Tv-one, it may not be big on calibration features or inputs but it has really high bandwidth capabilities, i tried 800p@120 and it looked pretty good. And wont we be able to save on bandwidth for 3D if they do scope movies with it? We can do AAS then, and use less bandwidth.

Athanasios

[ecrabb]

[VideoGrabber]

I hate to be the bearer of bad tidings, but I have to interject a little reality here. After the refresh rate issues are resolved, along with signal conversion, reduced resolution, etc, etc. CRT owners are still going to have big problems.

> ...and how well our CRTs work with the shutter glasses. <

Our CRT PJs will work fine with the shutter glasses, with a bit of ghosting that will be inevitable from green tube persistence, and the fact that green tends to produce most of the luminance. Many would find it tolerable, and a worthwhile tradeoff.

But, and this is a big but, I'm not sure anyone will want to use it. Why not? Because 3D will turn a 2D CRT from a 12 ftL experience into a 4 ftL experience. That's assuming you had 12 ftL to start with. Unless you also take extraordinary measures... shrink your screen size, or go to a high-power retroreflective screen (and position it to take advantage of the narrow viewing cone), 3D will simply be too dim and lack any punch on CRT displays.

How come? Because the active technology shutter glasses cut the light output in half (each open only 50% of the time), and even when open, they're not 100% transmissive. You'll lose about 2/3 of the light output (they pass about 30-40% per eye). Simple physics dictates that a CRT is not a good match for 3D, because we're already starting out behind the curve on brightness in the first place.

The only way around this would be a stack, with one PJ polarized left-circular, and the other right-circular. And using the passive glasses like they do in the theaters. With a stack, that also resolves any refresh rate and bandwidth issues, but as has been pointed out here, the number of folks that would (or even could, if they wanted to) set up a stack is pretty darn small.

Here's what Rodolfo La Maestra (an industry analyst) recently had to say about his experience of 3D at the CES 2010 show:

"Regarding light output, resolution drop, color shifts, color rendition, impacted whites and blacks, I do not want to sound negative but it feels like viewing a large projection screen with the projector iris totally closed, the lamp at the end of its life, and a totally altered color temperature compared to 2D. However, I enjoyed the 3D LG projector and the 3D Panasonic plasmas (flicker did not affect me)."

Ouch! And that was on bright digital projectors and plasmas, not (comparatively) dim to start CRTs.

[AnalogRocks]

We gotta start reproducing those old Sony 72" screen with the 13 gain

[AnalogRocks]

We gotta start reproducing those old Sony 72" screen with the 13 gain