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post #1 of 7 Old 11-30-2012, 09:59 PM - Thread Starter
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Sorry if this has been covered

First I know how the two types of 3D work, passive and active, and what is done to the picture to produce the 3D effect.
What I don't understand is where and how the decision is made.
What I mean is, there is only one type of 3D blue ray player and disks.
I have an "active" 3D and my brother has a "passive" 3D display but yet we both have the same model of 3D player.
Is the player sending out both types of 3D pictures and the TV, if "active" or "passive" 3D knows to displays that image?
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post #2 of 7 Old 12-01-2012, 08:22 AM
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The player is sending only one type of 3D image, which they call "frame packed," and the 3D display knows how to display that. So an active display shows it active, and the passive display shows it passive. Same with any other 3D source, such as a video game or cable box. Whatever type of 3D you send to the TV is always the same for passive and active. It gets converted to passive or active inside the TV.
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post #3 of 7 Old 12-01-2012, 08:22 AM
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My post was repeated.
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post #4 of 7 Old 12-01-2012, 05:36 PM - Thread Starter
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Thanks for the reply TM

So does the TV have a prossessor to do this, or does it simply extract the relevent data from the frame packet.
Do all displays use the same prossessor/software to do this or are there some better than others?
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post #5 of 7 Old 12-02-2012, 04:23 AM
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Quote:
Originally Posted by Tiki Steve View Post

Thanks for the reply TM
So does the TV have a prossessor to do this, or does it simply extract the relevent data from the frame packet.
Do all displays use the same prossessor/software to do this or are there some better than others?

Actually the frame is "unpacked" by the BD player. Frame packing just uses a complete left eye image and only the difference for the right eye to save disc space (frame packing is a form of data compression so a 3D film can fit on a BD). It then sends a decoded over/under 1920x2205 frame to the TV. This is a complete 1920x1080 image for each eye plus 45 blanking lines between in one frame.
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post #6 of 7 Old 12-02-2012, 01:56 PM
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Quote:
Originally Posted by William View Post

Actually the frame is "unpacked" by the BD player. Frame packing just uses a complete left eye image and only the difference for the right eye to save disc space (frame packing is a form of data compression so a 3D film can fit on a BD). It then sends a decoded over/under 1920x2205 frame to the TV. This is a complete 1920x1080 image for each eye plus 45 blanking lines between in one frame.

Yes that is the more precise description, and it helps explain why the TV is not burdened with a lot of processing - the BluRay player has already done most of it. Yet, that 1920x2205 frame sent to the TV is intimately associated with the frame packed format, and the TV gets such a signal only from frame packed 1080 sources. The TV "recognizes" those 1920x2205 frames as 3D and "knows" how to display them whether the display is active or passive.

Some TVs do that better and faster than others, but that usually has more to do with the type of display technology, the refresh rate of the display,and the efficiency of any video enhancement processing built into the display. This difference is most often discussed in comparing lag times among various displays.
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post #7 of 7 Old 12-03-2012, 01:22 PM
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With Active 3D the tv only displays the left image while the glasses go black on the right eye, and then the tv displays the right image while the lens on the glasses left eye goes black. This happens quickly, like 60 times a second so you don't notice the flickering. With passive both images are always on screen (left and right) but each eye gets a different image due to polarization of light from the TV and polarization filters on the glasses. With passive you only get half the resolution of the image since both left and right are displayed simultaneously. This is a basic description of these 2 technologies, you can use Google for more specific details.
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