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I thought the led tvs didn't require a back light, and that's why they where 40% more efficient.
This is true however Sony has a local dimming model.
Well yesterday I learnt that LCD monitors now come with a led backlight and are slightly more expensive. I went into my local puter shop tonight and looked at a 23" led LCD an found it drew around 60 watts. The ccfl 19" LCD I bought only draws 25 watts. So much for led's using less current than ccfl in a LCD. Don't go saying as the led LCD has a bigger screen it uses more power as the psu supplied is the same on the smaller led LCD's too...
No one has introduced 'LED' TV's.
Actually there is one, Sony - XEL-1 - 11" OLED TV. Only about $2000.
LG is just about to intro a 15" 15EL9500 in Europe for about 2000 euros. Said to have 10,000,000:1 contrast ratios and 0.001ms response times.
Another advantage of some of the LED tv's (LED's for back lighting of course) is the ability to dim in response to program information. The overall effect is a higher contrast, but also deeper blacks sort of like a CRT.
You mean EXACTLY the same as any remotely modern CCFL backlit LCD
Dynamic backlighting isn't anything new, or specific to LED LCD.