LED backlights in color screens comes in two flavors: white LED backlights and RGB LED backlights. White LEDs are used most often in notebooks and desktop screens, and in virtually all mobile LCD screens. A white LED is typically a blue LED with broad spectrum yellow phosphor to give the impression of white light. Since the spectral curve peaks at yellow, it is a poor match to the transmission peaks of the red and green color filters of the LCD. This causes the red and green primaries to shift toward yellow, reducing the color gamut of the display. RGB LED consist of a red, a blue, and a green LED and can be controlled to produce different temperatures of white. RGB LED for backlighting are found in high end color proofing displays such as HP Dream Color LP2480zx monitor or selected HP EliteBook notebooks, as well as newer consumer grade displays such as Dell's Studio series laptops which have an optional RGB LED display.
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