Cold cathode

A cold cathode is a cathode (a type of electrode) that is not heated directly by a filament or element, although a cold cathode can heat up during use as a side effect of normal current flow. The term cold cathode is often used to refer to cold cathode fluorescent lamps (CCFLs), which are often used where a long life is needed. Applications for cold cathode lamps include general lighting, backlights for LCD TVs and computer monitors, and artistic lighting such as computer case mods and automotive customization.

Cold Cathode Media

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  A set of cold cathode discharge tubes

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  The stacked digit arrangement in a Nixie tube is visible here

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  A standard computer case fitted with blue and green cold-cathode tubes

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  Cold-cathode fluorescent lamp backlight