SO CONFUSED ON 3D REQUIRMENTS - AVS Forum
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post #1 of 7 Old 06-20-2013, 04:21 AM - Thread Starter
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So I have been more confused than anyone as of lately. I am looking to buy a new 3D projector and cannot find out some simple info on ALL 3D Devices in general.

Are ALL the 3D devices I see like 3DTVs, LEDS, Plasmas, Projectors running at special refresh rates to produce 3D? It seems that some devices are 60hz and yet they say they are 3D capable? Mainly the newer HDMI 1.4 3D standard devices like 3DTVs etc. All I want to know are a few things before I go crazy! The main thing being :

- Are ALL 3D labeled devices required to have a 120hz (60hz per eye) spec?

So many people have feed me opinions... I just NEED to know that no mater what a manufacturer states in the specs, even if 120hz isnt mentioned.... That because Its labeled as being 3D ready, or 3D DLP Ready... IT will automatically mean it has the required specs needed for proper 3D viewing. I know TV sets only accept an input of 60hz BUT what about the actual refresh rate these units use for displaying 3D content? Some people have told me that ALL 3D labeled devices are capable of 120hz regardless of what the specs my state... And others have said that 60hz 3DTVs dont have TRUE 120hz and Run 60hz for all the 3D they view...

I AM NOT TALKING ABOUT MOTION INTERPOLATION nor a back scanning light.

Seems like the older model of the projector I want could do 120hz 3D mode? I checked the manual for the newer model but it says 60hz? So I thought ARE all 3D devices required 120hz/60hz per eye minimum? Or are some devices 60hz MAX and claim to handle 3D?

BTW The Projector I want uses DLP Link Active Shutter Glasses and requires them. That fact alone would make me assume its 120hz like ALL other newer 3D projectors.

I also found in the manual where the timings and resolution modes for 3D formats are listed... Something strange... It said the 720p (1280x720) Frame-packing 3D mode supported 90Khz Horizontal Scan rate : If you do the formula to find MAX refresh rate for that display mode @ 1280x720 : You get a surprising 119hz?! So does that mean it DOES support 120hz in (1280x720) 720p BUT only in Frame-packing 3d mode?


All of these numbers confuse the hell outta me. I just need someone to clear the air on somethings... Am I wrong?


- Are ALL 3D labeled devices required to have a 120hz (60hz per eye) spec? (Even if not stated as 120hz) "NOT TALKING ABOUT A SCANNING BACK-LIGHT"

- I thought ALL the newer standards for HDMI 1.4 frame-packing/SBS/T&B : 3D formats only need 60hz max for both eyes... (60hz True refresh rate 3DTVs)

- 120hz is only needed for frame sequential format (2 Full) & separate frames, where as frames are not packed or split into 1 whole/compressed frame... (Frame-packed/SBS/T&B)

- The Old Checkerboard format for 3D only used a 60hz refresh rate MAX, and used wobulation to display a slightly interlaced half-resolution 3D image in (1 frame) @ 60hz


Please ANYONE Correct me if I am wrong. I have had one other professional person who sells 3D hardware and knows more than me tell me I am wrong. He says Frame-packed 3D format requires a minimum of 120hz (60hz per eye) AND THAT ALL 3D DEVICES PERIOD HAVE THIS SPEC OR ARE NOT 3D OR CONSIDERED 3D.


Thanks Jonathan
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post #2 of 7 Old 06-20-2013, 07:35 AM
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Sorry, I can not answer your question, this is the projection screen forum.. But I do have a 3D projector for sale!

Doug

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post #3 of 7 Old 06-20-2013, 05:29 PM - Thread Starter
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So I was able to make forced refresh rates of (70hz - 120hz) on my Panasonic Plasma with Custom EDID timings... Anything higher than (70-85hz) on Progressive formats caused screen waves and frequency shaking "distortion".

1920x1080i (Interlaced) @ 120hz
1280x720i (Interlaced) @ 120hz
1920x1080p (Progressive) @ 70-85Hz
1280x720p (Progressive) @ 70-85Hz

So now I wonder to myself something...

I wonder if the nVidia 3D vision Kit I am getting soon would work on this Plasma! smile.gif

http://www.nvidia.com/object/3d-vision-system-requirements.html

All nVidia says you need is a 120hz capable display + 3D Vision kit and glasses + nvidia GPU + PC


MAYBE! I just wonder If I could get Nvidia 3D vision to accept the 1080i,720i 120hz signal?
MAYBE! if it could just accept the beefier 70-85hz modes for 1080p,720p?! biggrin.gif


Honestly my Panasonic has great interlacing/interlacing tech performance... I couldn't really tell the difference between the 1080i 120hz and 1080p 85hz as far as picture quality goes.

Check this site out. LOTS of people are testing their TV capabilities with EDID edits and custom timings only to find hidden supported refresh rates! biggrin.gif



Any thoughts on this and if there is a way to make custom resolutions and timings for Nvidia 3D Vision?
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post #4 of 7 Old 06-20-2013, 07:36 PM
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NVIDIA only lists DLP TV's from Mitsubishi under "supported 3D HDTV's".
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post #5 of 7 Old 06-20-2013, 07:40 PM - Thread Starter
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Thats Checkerboard only. I think my idea might work if i can force the mode and timings. The Panasonic is showing a full 120hz in 1080i and in 720i

Not sure if 70-85hz is good enough for progressive 3d modes though
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post #6 of 7 Old 06-20-2013, 08:47 PM
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1080P @ 120 Hz. Exceeds the bandwidth limits of hdmi cables. The limit is 5.4 GB/s iirc. Dual link DVI and Display Port cables on PC have the bandwidth to do 1080P @ 120 Hz, assuming u have a display capable of refreshing at 120 Hz.
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post #7 of 7 Old 06-24-2013, 09:20 PM
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By the way, this section is for projection screens, which is probably why you are not getting many helpful responses. Try your luck over in 3D Central.
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