http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/ Engadget Comments for LG.Philips demos 47-inch LED backlit-LCD with 1,000,000:1 contrast http://www.engadget.com/media/feedlogo.gif http://www.engadget.com en-us Copyright 2012 Weblogs, Inc. The contents of this feed are available for non-commercial use only. Blogsmith http://www.blogsmith.com/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 5th 2007 9:37AMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/
Do you have any idea how long it takes for an LED to burn out???]]>Feb 5th 2007 12:25PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 13th 2007 10:41PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 5th 2007 10:36AMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 5th 2007 2:56PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/
Mantari- Does sound great and with LEDs' life span at 100,000 hours I really don't see an issue of burn out?? Do some research, LEDs are the future. ]]>Feb 5th 2007 10:52AMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/2. But that's a _MEAN_ time between failure. Not a guarantee.
3. A 47" TV could easily have 100 LEDs.
4. You're betting that all LEDs will follow the mean. Guess how many are going to fit outside of one standard deviation? Two standard deviations?
5. If you've had enough LEDs, you'd know that some *will* fail prematurely. Ask people who have run a number of LED christmas lights for two seasons.
6. Another example: one of the Aqua Teen Hunger Force LED displays on eBay? Did you see the one where a bottom LED was burned out? It happens more often than you'd like.
7. LEDs put out less light as they become older
8. White LEDs fade even worse as they become older because they put out UV light which hits against a white phosphor coating. That coating luminesces less and less over time.
9. Other issues can impact LED lifespan, such as heat.
10. A failure of a single LED will be apparent and will create a dark spot in the image.

I like LEDs myself, but experience is a cruel teacher. An expectation of 100 years before they dim is outrageous. Go to PlanetChristmas and ask them about how their LED based Christmas lights seem less intense when it comes to a second season.]]>Feb 5th 2007 11:40PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 17th 2007 4:42PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 5th 2007 1:21PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 5th 2007 1:35PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Feb 8th 2007 5:58PMhttp://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/http://www.engadget.com/2007/02/05/lg-philips-demos-47-inch-led-backlit-lcd-with-1-000-000/Summarizing the above entries, there are three concerns:

1- What if an LED burns out?
2- What if an LED "dims" over time?
3- It isn't true-black, because they pump up the brightness to get their "1,000,000:1 levels"

1 - If an LED burns out, you go to your warranty card, and you have them replace either your entire set, or the faulty LED. That's what warranties are for. That's the best that any TV manufacturer can do for you (LCD, Plasma, CRT, whatever).

2 - If an LED goes dim, then the set can presumably detect the variation in impedance, and pump more power to that LED. I am not just taking a guess here. This set (by LG) can individually dim and brighten the LEDs. It controls them with some kinda on board logic system which is very responsive.

3 - The 1,000,000:1 is not achieved solely by brightening the backlight. It is achieved in part by the ability to DIM the backlight LEDs. This way, areas where there is no light being shown (black parts of the screen) are dimmed from the rear, rather than relying on the LCD's "windowshade" technique of just trying to block out all light.

It is this windowshade technique which is the LCD's Achilles' heel. The fact that the projected light is always at the same intensity, and therefore to get black, you have to try hard to "cover it up". You end up with the black areas of your screen giving just "dark gray". But this technology allows areas which are entirely dark to be dimmed down to near total black. LG has fixed the problem that plagues LCD here.

But what about the areas of the screen where there is "some" light. (Imagine the moon on the left side of the screen, on a darkened sky). Those areas will be tricked by your own eye. You look near the moon, and its not completely dark... bummmer... but luckily your eyes compensate, because you're looking at the moon. Your pupil dilation decreases (in milliseconds).

When you look to other (black) areas, your pupils re-dilate, but now you are looking at areas where the LEDs themselves are progressivly dimmed (as they move away from the part with the moon). See?]]>May 10th 2007 8:32PM