Official LG "XXLH90" 240hz LED Owners Forum [NO PRICE TALK] - Page 7

Originally Posted by ltgary

If you check back a few pages you will see there is much debate about how many leds are in these sets. LG apparently releases the number of groups for leds but doesnt tell how many actual individual lamps there are. But why does it really matter???? Whether it has 1,000 or 3,000 what counts is do you like the picture. LG gives the contrast ratio as 2,000,000/1. What does that really mean to the end user. My 47lg90 from last year is supposed to only have 1/2 the leds as my 55lh90 from this year. However I cant see a difference in picture quality/brightness etc so what does it matter how many are in each set??????????????????The picture on both, IMO, is great. Dont base your buying decision on MANUFACTURERS specs. They are all trying to out do each other.

Originally Posted by Nightmare

When I first setup the TV i noticed a super jittery picture on the first HD channel I watched. It might have been the "source" and not the TV. I have the same DISH Vip722 DVR and sometimes my recordings act up. I can usually fix it if I jump forward or backward, sometimes I need to stop the show and then re-start.

I worked at a Home Theater place in Sacramento several years back and I can see things that most/many peopel miss.

I was at Bestbuy the other day looking at the wall mounts. They had Transformers on demo; trying to show the difference between 120hz and non-120. The picture on both TVs was total crap. The colors were WAY WAY oversaturated and there was more grain than a box of Wheeties.

Originally Posted by ltgary

In theory I might agree with Flyers: More leds would seem to be better for the reasons he pointed out. But that would presume that all the leds were identical. Are they? I know from my flashlights that leds come in different colors, wattages, and sizes. My one watt flashlight is not nearly as bright as my three watt flashlight but both use a single led driven with the same amount of C cell batteries. My UV flashlights are very different from my white ones. Catalogs show leds in different mm sizes(diameters). There may be alot of science involved here besides just numbers??? If my memory is correct Sony speaks about the color of their paticular leds. So maybe Flyers is right and we should be concerned with numbers and then again maybe that isnt so important. I really dont know. Maybe its not the numbers but the grouping or placement of the leds behind the screen??
I just know that to my tired old non-technical eyes both my sets look fine even though one is supposed to have twice as many leds as the other. It would have been nice if LG in their literature would have told us what the additional leds were supposed to do. We know there are more but why did they feel it necessary to increase the amount from last years model??

Originally Posted by ltgary

In theory I might agree with Flyers: More leds would seem to be better for the reasons he pointed out. But that would presume that all the leds were identical. Are they? I know from my flashlights that leds come in different colors, wattages, and sizes. My one watt flashlight is not nearly as bright as my three watt flashlight but both use a single led driven with the same amount of C cell batteries. My UV flashlights are very different from my white ones. Catalogs show leds in different mm sizes(diameters). There may be alot of science involved here besides just numbers??? If my memory is correct Sony speaks about the color of their paticular leds. So maybe Flyers is right and we should be concerned with numbers and then again maybe that isnt so important. I really dont know. Maybe its not the numbers but the grouping or placement of the leds behind the screen??
I just know that to my tired old non-technical eyes both my sets look fine even though one is supposed to have twice as many leds as the other. It would have been nice if LG in their literature would have told us what the additional leds were supposed to do. We know there are more but why did they feel it necessary to increase the amount from last years model??

Originally Posted by flyers

I don't really know if all the LED's in the backpanel are all the same wattage or size, however, I would make the assumption that they are the same size wattage and color temp and only because there would be "hot spots" and a very non-uniform screen if they varied. I believe the "older" sets had few more likely because the more LED's you have the more complex the hardware and software needs to be. As technology gets better and cheaper it's easier to "add more" LEDs. Now, there is a point where there can be "too many" and that is probably the balance that they take into consideration during development.

Sony and Samsung didn't divulge how many LED's they have but I do know that Sony and the lone Sharp panel both use RGB LED lights rather than the cheaper white LED's. I'm not sure about the Sharp but the Sony used 2 green, 1 blue and 1 red LED. in each cluster and then they is put into zones. That is why the XBR 8 has unmatched flesh tones.

LG has stated they have 240 zones and almost 3,000 LED lights and yes this is double than the amount on last years LH90. Why, probably because of halo effect and better grey scale uniformity. But of course who really know why.

Originally Posted by Benny42

My take:

More dimming zones (accurately controlled by software!) = potentially smaller halos (if controlled intelligently) and potentially thinner sets (the gap between the LED and the panel doesn't need to be as large)
I believe the latter is the biggest advantage in the market and the companies will make sure that their new sets are thin as hell!

More LEDs = uniform picture (overlapping light cones of the LEDs) but higher wattage (this is why the Sony XBR8 uses more power than the Samsung A950, but still much less than a CCFL-LCD of the same size)

Now it gets more theoretical:

RGB-LEDs (regardless of the dimming capability) = potentially wider color gamut meaning "truer", "richer" colors (sadly no source material really makes use of that ATM). There are some potential PC applications (notebooks & monitors with RGB backlight are out now) but AFAIK nobody supplies color profiles for TVs...

RGB-LEDs used as a white light source (no RGB dimming) = "better" white than pseudo-white LEDs, easier to tune with the color filter (the XBR8 is better out of the box) and longer life (when a white LED ages all colors are affected...)

RGB-LEDs used as RGB local dimming (only the Sharp XS1 at this time, *not* the XBR8) = Potentially better colors in dark areas, potentially even better colors - according to some reviews.
However, all reviews I have seen are from december 2008, january 2009 and they apparently tested a (pre/early-)release model of the XS1 which had a lot of bugs and/or missing features (no 100/120 Hz mode).
These reviews also critized some aspects about the picture and said that it is a bitch to calibrate (apparently the colored light of the BLU is difficult to tune with the color filter of the panel and the software/user interface isn't very helpful).

That being said I see a huge potential in this until OLED becomes the standard.

bye
Benny42

Originally Posted by ltgary

See Flyers you validate my prior comments: These sets according to you still look like crap with their super high price and all of their manufacturer specs. It really comes down not to what the manufacturer claims but how the picture actually looks. It could have two purple leds and be fine if it produced the kind of picture you and I want. Who really cares how they got there--if the picture displayed causes your jaw to drop and the price is affordable--its a winner

Sony and Samsung didn't divulge how many LED's they have but I do know that Sony and the lone Sharp panel both use RGB LED lights rather than the cheaper white LED's. I'm not sure about the Sharp but the Sony used 2 green, 1 blue and 1 red LED. in each cluster and then they is put into zones. That is why the XBR 8 has unmatched flesh tones.

Originally Posted by flyers

I am really starting to consider this set, especially a 55 LD at that price point. I wonder how it compares to the Sammy edge lit 8000. I know LD is technically better, but the 8000 is one nice TV but too pricey.

How does the LG handle SD content?

Please post some pictures soon.

Originally Posted by ALMA

Sony XBR8/X4500 has 72 zones (each zone 4x 4 LEDs - 2 green, 1 red, 1 blue) for 46" and 100 zones for 55".

Originally Posted by SoSo

The 55B8000 and the 55LH90 both will be in the tv shootout this weekend. It may worth check it out.

Originally Posted by Benny42

Interesting! Where did you get these numbers?
While I would agree that the 46" has less zones than the 55" - the sets use the same LED-modules, AFAIK - I find the numbers somewhat puzzling.
How do 72 zones translate to horizontal and vertical dimensions? 9 x 8 doesn't really fit and 12 x 6 isn't necessarily better for the 16:9 format either.
And how would 100 zones fit the 55"? 96 zones could be 12 x 8...

bye
Benny42

Originally Posted by Nightmare

I took a couple photos today, but they were all slightly out of focus( no flash).
I'll try it again with a tripod, but I'm not too sure that will work either.
The camera is a Kodak 7 MP point and shoot. I think it may take a GOOD SLR to capture an accrate photo of the TV.

Interesting! Where did you get these numbers?
While I would agree that the 46" has less zones than the 55" - the sets use the same LED-modules, AFAIK - I find the numbers somewhat puzzling.
How do 72 zones translate to horizontal and vertical dimensions? 9 x 8 doesn't really fit and 12 x 6 isn't necessarily better for the 16:9 format either.
And how would 100 zones fit the 55"? 96 zones could be 12 x 8...

Originally Posted by ALMA

From a officially paper by Sony.
The 55" has 1600 LED´s! One dimming zone has 16 LED´s = 4 x a group of 4 LED´s (2 x G, 1 x R, 1 x B). 4 x 4 = 16

Originally Posted by mtman58

doppler1, Did you take a look at the 55LH55?

I am about to buy my first TV in 13 years. Want to get it right.

I am thinking of either the 55LH55 or the 55LH90. Which one??

Originally Posted by Yukon Trooper

Basically, the Tosh did average.
D-Nice said the LG came in a close fourth overall for him, and that was right behind the Samsung plasma. His calibration report for the LG reflects this in its accuracy for colors and high contrast ratio.

Originally Posted by rahzel

Yeah, the Toshiba didn't do so well. I think for LCD, it would go LG -> Samsung -> Toshiba -> Sony. For Plasma, Pioneer -> Panasonic -> Samsung seemed pretty close) -> LG.

Originally Posted by marcp

i had a hard time make heads or tails of the shootout live feed. no idea why they chose to test a xbr9 over a xbr8? of what was on test, these guys indicate the lh90 did well -

http://www.avsforum.com/avs-vb/showt...151605&page=27