backlight

A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light by themselves—unlike, for example, cathode ray tube (CRT), plasma (PDP) or OLED displays—they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel, unlike frontlights, which are placed in front of the LCD. Backlights are used in small displays to increase readability in low light conditions such as in wristwatches, and are used in smart phones, computer displays and LCD televisions to produce light in a manner similar to a CRT display. A review of some early backlighting schemes for LCDs is given in a report Engineering and Technology History by Peter J. Wild.Simple types of LCDs such as in pocket calculators are built without an internal light source, requiring external light sources to convey the display image to the user. Most LCD screens, however, are built with an internal light source. Such screens consist of several layers. The backlight is usually the first layer from the back. Light valves then vary the amount of light reaching the eye, by blocking its passage in some way. Most use a fixed polarizing filter and a switching one, to block the undesired light.

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  1. S

    Two tellys with black screens

    Telly seemed to be on the fritz and then we couldn’t get it to load up a screen at all, power on etc, light flashes when using the remote but no picture. Pretty old telly so figured it was time for a replacement. New telly arrived Thursday, working fine, tried to turn it on this afternoon and...
  2. snufkin

    LG 43UK6300 Backlight & sound but no image

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  3. SparkyChick

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    Hi all, Wondering if anyone has any information (or could get hold of some) regarding diagnosing and fixing backlight faults on that particular Samsung LCD TV/Monitor? I've managed to get a service manual which helpfully makes it clear that the power supply board (where the CFL inverter is for...

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