1080p 3D Blu-ray vs. 1080p SBS on a 720p projecto - AVS | Home Theater Discussions And Reviews
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post #1 of 9 Old 01-21-2015, 08:28 AM - Thread Starter
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1080p 3D Blu-ray vs. 1080p SBS on a 720p projector

Hi people,

I have a 720p 3D projector (Acer H5380BD). My screen is 100". I've just bought 3D active glasses and tested it using a 1080p SBS video.
It's really impressive. I wonder; does 1080p 3D bluray (frame packed) have any advantage against 1080p SBS 3D on a 720p projector?

Thanks

Last edited by Rairun; 01-21-2015 at 08:54 AM.
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post #2 of 9 Old 01-21-2015, 09:16 AM
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1080p 3D Blu-ray vs. 1080p SBS on a 720p projecto

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Originally Posted by Rairun View Post
Hi people,



I have a 720p 3D projector (Acer H5380BD). My screen is 100". I've just bought 3D active glasses and tested it using a 1080p SBS video.

It's really impressive. I wonder; does 1080p 3D bluray (frame packed) have any advantage against 1080p SBS 3D on a 720p projector?

Even on a 720p projector, frame-packed 1080p from a bluray (which delivers full resolution per eye) will look superior to H-SBS 1080p.

Two reasons: first, there's much less compression on a bluray than almost any rip.
The second reason is resolution: H-SBS means each eye is seeing half the image; split horizontally down the middle. That is, the source resolution per eye is 960x1080 (rather than 1920x1080.)
This half-resolution has fewer vertical columns (960) than the projector can display (1280), which means you're losing out on some native resolution at the same time.

When you get a chance, compare a movie between these two formats and drop some feedback here

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post #3 of 9 Old 01-22-2015, 07:31 AM - Thread Starter
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Hey, thanks for the reply! I will surely give some feedback if i have that oppurtunity.

Btw, i wonder, should i set refresh rate on windows to 120hz or leave it at 60? My glasses are 144hz and the projector supports 144hz...
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post #4 of 9 Old 01-22-2015, 09:23 AM
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1080p 3D Blu-ray vs. 1080p SBS on a 720p projecto

Not a problem.

For refresh rate: you'll notice that you can't actually select 144Hz in Windows.
The 144Hz supported in 3D actually refers to what's known as 3D 'triple-flash', which is effective when the source framerate is 24Hz.

This causes each source frame (at 24Hz) to 'flash' to each eye three times (24 x 3 = 72 frames; per eye - so 144Hz combined). The sequence is along the lines of 'left-right-left-right-left-right'; for each frame of a 24Hz source. This is actually how 3D is rendered in RealD movie theaters.

The reason? The faster glasses shutter time (144Hz) means you perceive less flicker, making 3D viewing more comfortable.


So for 3D viewing, a source refresh-rate of 24Hz (the same as bluray) produces the most comfortable 3D on a projector that supports 144Hz triple-flash like yours.

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post #5 of 9 Old 01-22-2015, 05:37 PM - Thread Starter
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But my projector does not support 24Hz in 720p. So i'm curious about the right refresh rate to set.
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post #6 of 9 Unread Today, 11:08 AM
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Quote:
Originally Posted by Rairun View Post
But my projector does not support 24Hz in 720p. So i'm curious about the right refresh rate to set.

Are you sure? It's rare for a modern projector not to support 24Hz input: I have seen some circumstances where it has to be HDMI-connected in order for it to be supported (eg, not via VGA).
But since this is what blurays are almost all mastered at, I'd be surprised if the projector didn't accept 24Hz input at 720p at all. Do you have a manual to double-check?

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post #7 of 9 Unread Today, 11:48 AM - Thread Starter
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I think 24Hz in 720p is not a standard. ATI CCC doesn't let me set 24Hz when the resolution is set to 720p.
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1080p 3D Blu-ray vs. 1080p SBS on a 720p projecto

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Originally Posted by Rairun View Post
I think 24Hz in 720p is not a standard. ATI CCC doesn't let me set 24Hz when the resolution is set to 720p.
Hmmmmm... you could very well be right.



24Hz is the only way you'll get 144Hz sync from your glasses to the best of my knowledge: what about passing 1080p @ 24Hz and letting the projector down-scale it?

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post #9 of 9 Unread Today, 03:39 PM - Thread Starter
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That seems as an option but i don't know if it will look good. Let me test
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