3D Scam Thread in Techrepublic

[kaushik]

consumers are getting confused to death!

 

[santanusinha]

Also, its very easy for you to dismiss other people's knowledge as conjecture and say you have no time for it. In my opinion, the whole point of being at a forum is to learn and share from others.

Since I do not know anything about what is the requirement for light intensity in a theater, commenting on that would be useless conjecture on my part. (Not on yours since you clearly have some knowledge on the subject). That is what i meant. Hope that clear things out about the conjecture part.

 

[Thad E Ginathom]

I'm not very interested in TV of any kind, but my daily round of gadget blogs doesn't show up much enthusiasm for 3d TV

 

[Bluu]

I'm not very interested in TV of any kind, but my daily round of gadget blogs doesn't show up much enthusiasm for 3d TV

That can only be good news!

 

[santanusinha]

3D refresh rate (other than 3D BR) is 50/60Hz mostly on Plasma panels and this years cheaper 100Hz LCDs... However they are 100/120Hz for 200/240Hz LCD panels..

Talking of 3D BR, again you don't see 24Hz on each glass! Its ATLEAST doubled to 48Hz for each eye (in plasmas and other 100Hz LCD TVs). 240Hz TVs multiply them 4 to 5 times (96 to 120 Hz) for each eye. Such conversion happens in 2D 24Hz playback also...

Here it is again: 3D HDTV and HDMI Explained | HD Guru

Let me explain, what I have understood from the article:

The original signal for 3D BD is 1920x2205 @24 hz. It also supports corresponding over/under 720p at 60Hz or 50Hz. So transmission for FHD3D is ALWAYS at 24fps from the BD player.

For 3d, the frame size is different than from 2D. 2D frame size is ~1920x1080 (+ some padding?). For 3D, checkout the following:

The 1920 x 2205 frame contains info for both the left and the right eye and is the input that your TVs receive from a 3D BD player.

For frame sequential, it's 1920x1080 @48Hz. That is, the BD player would send out interleave 24 frames of left eye images with 24 frames of right eye images per second. But essentially still, it will provide only 24 frames of data for each eye.

After that, if you have turned on any kind of extrapolating feature (such as motionflow etc), the TV will create extra frames and show it to you. That can be whatever the TV's processor can support (100Hz, 200Hz etc). If not, the input frames are just sliced off and transmitted to each eye at 24Hz.

At least, that is the way it is done for normal 2D-BDs. I don't think it's drastically different in 3D Tvs.

And just to mention, I turn off motion compensation on my V20 as it creates visible interpolation artifacts in some scenes. (I can give specific instances of scenes but i don't think that is necessary here)


Please do feel free to correct me if I am wrong.

Regards,
Santanu

 

[akhil7j]

I think you have misunderstood me on a couple of counts.

1) Brightness is an issue in theaters not on a 3DTV.

2) About 60Hz, that is not with regards to 3D BD. 3D BDs do not even support that refresh rate. Optimally, for 3D gaming, it would be desirable to have 60Hz per eye pictures (60fps is considered desirable frame-rates in the gaming community). At this moment, the HDMI standard (1.4a) supports 720p/60Hz over/under configuration. (Notice the lower resolution?)

So finally 3D tv's would need to match up to 1080p/60Hz over/under config to deliver full-HD 3D games.
[So they will shove this down again our throats in the recent future in a new HDMI spec. The cables have the required bandwidth, but the transmitters/receivers don't.]

Regarding LG Cinema 3D, no, I have not seen it. Personally, I like plasmas, but, since you recommend them so highly, I plan to take a look. I think I read somewhere that they give you half the resolution (correct me if I am wrong), since they use different polarizations for even and odd lines on the display. If yes, wouldn't that be like taking a step backwards?

I like Po's initial fight sequence in Kung Fu Panda 2 as well as the next man (in fact, I was completely blown away by it). But, to tell you the truth, I had a terrible headache after I came out of the theater.

Right now, I think the equipment manufacturers are just experimenting with the different options at our expense. That is what I do not like with the current state of affairs in 3d. And this, as I understood, is the exactly the point that the original author was tying to put forward in the actual article that started this thread.

- Santanu

PS: Ref: 3D HDTV and HDMI Explained | HD Guru

Half resolution problem was corrected with the updated firmware before launching the TVs in India. So its an old news.

Over/Under, Side by Side are not the actual 3D formats. They are old now and gives you half the resolution. Even checkerboard format gives you half resolution which is for DLP TVs. However better than Over/Under & SBS.

Frame Sequential is the format with gives you actual FHD resolution without any loss. So while taking the demo, make sure the format is Frame Sequential.

The horizontal lines in Cinema 3D TVs are because of 3D (Polarized) Films on top of screen. They are only visible if you will watch the TV from close. For 47" TV, 2mtrs viewing distance is minimum.