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LCD televisions use liquid crystals to open and close tiny shutters, three for each pixel of the image. As each shutter opens and closes, light can pass through in varying amounts. Using a red, a green and a blue filter in front of the three crystal shutters allows any color and any brightness to be created. The liquid crystals don't actually emit their own light.
This is where the back light comes in. Behind the liquid crystal layer is a light layer. Most LCD televisions have used cold cathode lamps but more recently, LED back lights have been used as an alternative. LED lighting is smaller and generates less heat than the cold cathodes but they both do the same job.
At the time of writing (Summer 2012), LED televisions are in fact LCD televisions with back lighting by LED. Very shortly, OLED televsions are to be released by a few manufacturers. These use LEDs to generate every pixel of the image without any additional back light layer. These are different to the LCD LED televisions currently available.
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What does it mean when LCD TVs are advertised as 'backlit'?
The backlighting is exactly what it says. There's an LED light source behind the screen which improves the brightness of the display electronically.
How are LCD TVs different from conventional TVs?
Conventional televisions use tubs to generate pictures on the screen. An LCD television has no tubes, it generates pixels directly on the screen which are backlit in order to make them visible.
How many watts does a 32 inch Samsung LCD TV use?
An LCD TV with a traditional flourescent backlight uses about 110 watts of power. A LED backlit LCD TV uses about 85 watts of power in the 32-inch size.
What is the most reliable 22 inch Samsung LCD tv?
The Samsung UN22C4000 22" LED-backlit LCD TV 720p seems to be the best bet for money and reliability. The other Samsung TVs seem to have minor problems with refresh rate.
How do you tell if your TV has a plasma screen?
There is no certain way to tell if is plasma just by looking at it. A flourescent backlit LCD TV looks just like a Plasma TV. You can Google the model of the TV or look at the manual.
Which is more energy efficient lcd or led tv?
Power consumption varies between individual models, but LED-backlit LCD televisions typically consume less power than plasma televisions.
Are there good 3D TV deals out there?
The most popular 3D television for the price is the Samsung UN55D7000 55" LED-backlit LCD 3D television. Although it costs $1,500 and is more than other televisions, it is the best rated on the market.
What is the best mark for an LCD TV?
I am not sure what you mean by "best mark" in the market. Their are many different brands that sell LCD TVs at different qualities consumersearch.com/lcd-tv has reviews of many different LCD TVs.
What does OCM mean on LCD TV mean and do?
Liquid crystal display
Does the led tv panel gives better contrast and colour picture compared to ccfl LCD?
Good question! My friend, undoubtedly LED-backlit gives a better contrast, offer wider colour gamut with lower power comsumption.
What household items have leds?
LEDs make light, so some lights, usually outdoor ones, and some new TVs are LED backlit. Also most computer LCD screens are LED based. There are some more though.
Does Panasonic have an led tv?
On current market, only Samsung is selling LED TVs ------------------------------------------------- Correction, Sharp also has LED Backlit Flat Panel HDTV's. Further correction, majority of desktop flat panel monitors for computers are now coming out in LED tech; LCD is the past.
