May 6 2009, 09:35 AM
QUOTE(anfieldude @ May 5 2009, 11:36 AM)
Ok. As u know, if u get a Full HD TV, there are 1920 X 1080 pixels (these are divided into sub pixels, Red Green Blue, together they make white). Then there is the backlight. The traditional backlights are horizontally placed behind tthe panel to drive the panel. Pixels are individual pixels that are arranged around the back of the panel. See picture below.
As you can see unless each pixel is backlit by a single LED there is no way there are equal amount of pixels to LED. I believe Sony or Samsung do not state the number of LEDs there are on the backlight. LG claims there are ~ 1500 LEDs in their LED backlighting LCDs. 1500 LEDs to light up an area that has 2 million odd pixels will have the blooming effect that I mentioned and I have seen it on the Samsung A950 series. I have attached link to Cnet's blog explaining this. Oh BTW, I made a mistake with the name of the 3 LED method that Sony uses, it is Triluminous and not Tristimulous. Nice read, check out if interested.
CNET explanation
From the CNET side, for Sony LED backlit, even thought they use RGB LEDs which are muc better than single(white) LED but the amount of LEDs used as seen from the photo are not that many therefore would not be able to perform good local dimming as well.As you can see unless each pixel is backlit by a single LED there is no way there are equal amount of pixels to LED. I believe Sony or Samsung do not state the number of LEDs there are on the backlight. LG claims there are ~ 1500 LEDs in their LED backlighting LCDs. 1500 LEDs to light up an area that has 2 million odd pixels will have the blooming effect that I mentioned and I have seen it on the Samsung A950 series. I have attached link to Cnet's blog explaining this. Oh BTW, I made a mistake with the name of the 3 LED method that Sony uses, it is Triluminous and not Tristimulous. Nice read, check out if interested.
CNET explanation
I have open up Samsung LED backlit LCD, the amount are quite a lot, but not sure got over 1500 LEDs used or not
. but i believe they can perform much better local dimming than Sony. But until i get my hand on Sony LED back lit LCD, i cannot really confirm the amount of LEDs used as compared with Samsung. As of now, i don't think i will pay the overly priced Sony LED backlit LCD.I too have check the blooming effect on Sumsung, my personal view not that visible and when compared to CCFL backlit LCD side by side. CCFL LCD no fight at all.
The life span of LEDs are much longer than CCFL and the production cost for LED back lit LCD is much cheaper than CCFL LCD. however they are sellling it at much higher price now as the performnce is way much better than CCFL, but i believe the price will drop drastically once all LCD maker switch to LED back lit. Therefore for plasma camp side, they are going to have their hand full if they want of resurrect plasma TV.
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