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Optoelectronics/Displays

LEDs replace CCFL in LCD panels

Posted: 26 Sep 2007

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Keywords: LCD CCFL LEDs

[Summary of tips] Even if the next LCD you buy has pretty much the same characteristics as the last LCD you bought, a change is likely to have occurred behind the scenes. In display sizes below about 15 inches, the tried-and-true cold-cathode fluorescent lamp (CCFL) lighting system for the LCD is rapidly being replaced by light-emitting diodes.T......

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Related Terms

What is LCD? What is an LCD TV?
A display technology that uses rod-shaped molecules (that flow like liquid and bend light. Unenergized, the crystals direct light through two polarizing filters, showing a natural background color. When energized, the crystals redirect the light to be absorbed in one of the polarizers, causing the dark appearance of crossed polarizers to show. The contrast and viewing angle improve as the molecules are twisted further.
LCD TV
Liquid-colour display television (LCD TV) sets use LCD technology to display images. LCD TVs are lighter than CRT TV sets and consume less power.

What is CCFL?
Cold cathode fluorescent lamps (CCFLs) have a cathode element that is not independently heated. If sufficient voltage is present, electrons can be stripped even out of a cathode operating at ambient temperature. Most cold cathode devices use mercury or other hazardous heavy metal vapours for ionisation.

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