How do led televisions display the image?

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asked Jun 30, 2017 in TV's by xxde (910 points)
How do led televisions display the images on the screen?

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answered Jul 15, 2017 by Desperter (410 points)
Liquid crystal display is a form of visual display technology that functions by sandwiching a layer of liquid crystals between two transparent electrodes -- or conductive surfaces.

Liquid crystals are specialized molecules that flow like liquids but polarize light like solid, crystalline structures. An LED TV can alter the alignment of these liquid crystals by applying an electric current to small, specific areas of the liquid crystal layer.

By altering the arrangement of the liquid crystals, an LED can control how the layer transmits the light that flows from the TV's back lighting. In this way, an LED TV can generate on-screen imagery. While a traditional LCD TV relies on the same technology, an LED TV utilizes a more advanced form of back lighting.

LED Lighting
An LED TV illuminates its LCD panel with light-emitting diodes. LEDs consist of small semiconductors, which glow during exposure to electric current.

Specifically, this current flows between LED anodes, which are positively charged electrodes, and LED cathodes, which are negatively charged electrodes. In contrast, a traditional LCD TV utilizes fluorescent lamps for back lighting.

These lamps function by using mercury vapory to create ultraviolet rays, which in turn cause the phosphor coating of the lamps to glow. LEDs have several advantages over fluorescent lamps, including requiring less energy and being able to produce brighter on-screen colors.

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