1) "Backlighting" -- As to backlighting
back·light
Pronunciation: -"lIt
Function: noun
: illumination from behind; also : the source of such illumination
- backlight transitive verb
Pronunciation Symbols

This article is about backlights in LCD displays. Backlight is also used to refer to the rear window of an automobile. A third meaning for backlight is the practice of lighting from the back in the context of lighting design.

A backlight is the form of illumination used in an LCD display. Backlights differ from frontlights because they illuminate the LCD from the side or back, where frontlights are in front of the LCD. They are used in small displays to increase readability in low light conditions, and in computer displays and LCD televisions to produce light in a manner similar to a CRT display.

The light source can be an incandescent light bulb, one or more light-emitting diodes (LEDs), an electroluminescent panel (ELP), one or more cold cathode fluorescent lamp (CCFL) or hot cathode fluorescent lamps (HCFL). An ELP gives off uniform light over its entire surface, but other backlights usually employ a diffuser to provide even lighting from an uneven source.

Backlights can be any color. Monochrome LCDs usually have yellow, green, blue or white backlights, while color displays use white backlights that cover most of the color spectrum.

LED backlighting is used in small, inexpensive LCD panels. The light is usually colored, although white LED backlighting is becoming more common. ELP backlighting is often used for larger displays or when even backlighting is important; it can also be either colored or white. An ELP must be driven by relatively high voltage AC power, which is provided by an inverter circuit. CCFL backlights are used on large displays like computer monitors, and are usually white in color. These also require the use of an inverter and diffuser. Incandescent backlighting can be used when very high brightness is desired, but a drawback is the limited life of incandescent bulbs, and the amount of heat generated, which often means that the bulb needs to be mounted away from the display.

LED backlighting in larger displays helps to improve the color representation of the LCD display. LED light is created by three separate LED's to produce a color spectrum that closely matches the c..."

Further Data On Term for backlighting
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