The LCD (Liquid Crystal Display) was the display technology breakthrough that made laptop computers possible. Before LCDs, there were some portable computers known as “luggables” that employed a small tube display that took up half the room and power. LCD Thunderbolt monitor is lightweight, consumes minimal power, and unlike the old-fashioned tube displays, is well suited to getting bounced around.
The LCD panel itself acts as a sort of electronic color film, but the images it produces are nearly invisible to the eye.
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If you remember the old 35 mm slides that used to be popular in photography, you’ll remember how hard it was to make out the picture without a slide projector or a light table.
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The light source that turns the LCD “film” into a bright display is called the “backlight.”
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Short about LCD
The current generation of laptops employ a special type of fluorescent light, a CCFL (Cold Cathode Fluorescent Lamp) tube, which provides a bright white light that is evenly distributed behind the LCD screen by reflective surfaces. The CCFL tubes are very thin and relatively long lived, but they require a special power source to light them.
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This power is provided by the inverter, a circuit that transforms the low voltage DC power your laptop runs on into a high voltage, high frequency electronic signal. Inverters are the Achilles heel of laptop display systems. If the LCD only displays the faintest of images, it means the backlight isn’t lit.
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Inverter or wiring failure is more common than actual backlight burn-out.
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