The only difference between liquid crystal display monitors and light-emitting diode LCD display screens is the type of backlighting used to illuminate the screen. LED-LCD displays, also called LED, utilise the same liquid crystal display technology as traditional LCD screens but utilise an LED backlight, instead of a traditional cold cathode fluorescent light.
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The picture quality of LED displays compared to LCD displays really varies on the picture itself, the environment of the display, and opinion. Editors at "PC Magazine" say LED screens are exceptional at removing shadows and displaying areas of extreme white or black, especially around the edges of the screen. LED screens are also claimed to perform better in darker viewing environments, but since so much can vary between manufacturers, viewing environments, and display settings, there is really no clear cut winner.
LED displays are clearly the most expensive on the market, mostly because many utilise the technology's capabilities into a thinner design. According to CNET's David Katzmaier, the extra price tag of an LED display is not worth it for the average consumer. LEDs really only present an advantage to videophiles who can tell the difference between the technologies, and those that prefer the design aspects of LED screens.
The electrical components required to run a traditional CCFL backlight on an LCD screen require much more space than an LED-based backlight. LEDs also use a technique referred to as "edge lighting," which allows for LED displays to be much thinner, with models like the LG Infinia measuring in at just 1.2 inches thick.
Generally, LED screens are the most energy efficient displays on the market. Screen size, brightness, and other settings can directly affect power consumption, but when optimal settings are reached, LED TVs are the most power efficient. A CNET study comparing television displays showed LCD screens, on average, used 111 watts, while LEDs were slightly lower at 101 watts.
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