5 replies to this topic

[pheggie]

LG Passive 3dtv with firmware update claims full 1080p 3d but you have to turn off Trumotion for it to work
"We tested LG’s LW6500 earlier this year but LG recently made some improvements to their 3D system and software to improve 3D picture quality and Cinema 3D was also recently awarded a Full HD 3D Certified by a German institute.

Before the Cinema 3D technology worked like this: During a time period of 1/200 seconds the TV showed 2 frames; 540 lines for the left eye and 540 lines for the right eye.
The new algorithm shows 4 frames instead of 2 during the 1/200 second time frame. It shows 1080i for the left eye and 1080i for the right eye.

When these are combined the two pictures create a 1080p picture according to LG. LG believes that this update improves picture quality on their Cinema 3D TVs to compete directly with the active 3D TVs such as 3D plasma TVs. You need to turn off TruMotion to utilize the new algorithm. See the illustration below."

http://www.flatpanel...l&id=1313938337

[AndysAtCoffs]

So, if I understand the way the passive 3D works, which is that Lines 1,3,5,7..... are optically permanently  tied to the Left Eye, and 2,4,6,8.... are permanently optically tied to the Right Eye via a polarisation mechanism in the 3D glasses, where the total lines available on the panel are still only 1080 then I cannot see how it is at all possible via firmware, to create an extra 540 Lines that are also optically tied to Left and an extra 540 that are optically tied to the right Eye.

To do what they are suggesting with the pseudo science page that the email above links to, would require that the panel be 2160 lines deep from day 1. I guess thats possible, but highly unlikely of LG to go to the expense of doing that (Think bleeding edge here) and then not release in a way that can be taken advantage of.....

Does it trigger the B/S detector light for anyone else?

Andy

[Orce]

Just upgraded my LG 55 inch and I must say the picture in 3D is excellent. I have also got a samsung 3D TV with active glasses and the LG is way better in 3D in every way.

[MLXXX]

AndysAtCoffs, on 12 March 2012 - 11:10 AM, said:

Does it trigger the B/S detector light for anyone else?

I think there is some stretch of technical credulity. If the technical details are to be read at face value Left "odd and even line material" is directed to half the lines (one polarisation), and Right "odd and even material" is directed to the other half of the lines (the other polarisation). The source material selected alternates between odd and even lines.  It's not all that clear why that would be particularly helpful for 24p movies. [It could possibly help with 25i sport (a "bob" de-interlace)]

When merging Left and Right images for stereoscopic vision, the human brain can tolerate considerable misalignments. A vertical misalignment of one line would be of no consequence to the human brain.

Despite this, if you view a an LG cinema LCD/LED display at close quarters it looks like an old fashioned CRT screen with visible scan lines and gaps in between those scan lines. There is a vertical roughness to the picture.  You need to sit back a little to reduce the roughness.

But do you lose visible resolution,  e.g. ability to read small letters on a name tag? Reportedly, according to LG, you don't.  How can that be right?  I think the main explanation is that Blu-ray video is very smooth to begin with so that it looks like film, rather than a digital TV news bulletin!  If there are small letters appearing on a name tag an actor is wearing, the letters will be a little soft, even watching in full resolution.

Testing

On the weekend I did some testing with Avatar 3D, comparing a Panasonic 50" plasma (VT-20) and shutter glasses with a 42" LED display (a Soniq L42D11A) and passive glasses. [I don't normally rip Blu-rays, but I ripped the main m2ts file for the purpose of testing. I was then able to play the movie on two pcs running the same player software into ATI graphics cards that created 24p frame-packed Full HD 3D at the HDMI socket. Compared with using a standalone BD player the separation between the Left and Right images was sometimes sightly less (I will look into that further when I get the time) but the visible detail was just as good.]

With this setup I was able to pause the movie at various stages so that both displays were showing the same frame (or very near to the same frame). I could then inspect the frame in detail either with the shutter glasses for the 50" display, or the passive glasses for the  42" display. The Panasonic is quite dark when playing Avatar in 3D and I set its picture to "dynamic"  to help overcome that. The Soniq needed no help with brightness in 3D mode (though it's my practice to run the Soniq at somewhat reduced colour and much reduced sharpness boosting compared with its default video settings).

I studied about 6 frames in all, choosing frames that showed detail. On both screens, the video frames looked soft close to the screen. At close quarters, the passive screen had a rougher look vertically, with the missing horizontal lines visible. The plasma screen of course showed no missing lines. It was a more professional looking picture, but there was no actual extra detail that I could see.

Similarly with the video running, the passive screen  although betraying a 'raster' at close viewing distances was no less "legible" for small details than the plasma screen.

The Soniq is a very cheap set and by default (before adjustment) had over prominent orange colours, but it performed very well in this test. No flickering at all (unlike the flickery Panasonic, though I am more sensitive than the average person to flicker).

In a separate test it performed well with 2010 State of Origin side-by-side 3D material: smoother 3D movement than with the plasma..

My only gripe with the Soniq passive display operating in 3D was that even when sitting within the correct critical vertical angle range,  ghosting was visible from time to time. Ghosting was virtually non-existent with the Panasonic, even using "dynamic" for the picture setting.

But I understand users have been pretty happy with the LG Cinema displays from a ghosting viewpoint. Is that right?

[Orce]

There was a new firmware update last night.

No details on what was included.

[yojovo]

From what I've picked up from here and there, LG's passive technology uses a system where the left and right sides pick up different horizontal lines (odds and evens). This provide 540p on each eye, which then combine to form 1080p in total for the viewer. Active technology on the other hand gives a full 1080p to each eye as the glasses flicker on and off, but this doesnt mean the viewer gets 2160p in total.