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Understanding Cold Cathode Fluorescent Lamps (CCFL'S)

From JKL Components Corporation
 

 
Portable devices predominately use a liquid crystal display (LCD) to convey information to the user. It is important to efficiently backlight the LCD, for which cold cathode fluorescent lamps (CCFLs) have come to be used very extensively. CCFL's efficiently convert electrical energy into visible white light providing a backlight, with the capability of a full spectrum of color filtered out and displayed. In addition to back lighting, CCFL's provide visible and ultraviolet energy for scanning and detection applications in portable devices. Lamp size (diameter and length) substantially influences electrical dynamics. An overview of the lamp's physics and construction in relation to gas discharge and phosphor stimulation helps in an understanding of the lamp's ignition and the ionized gas arc. A royer oscillator typically drives CCFL's with a sinusoidal waveform with a nominal frequency of 20-100 kHz.Direct current (D.C.) operation of the lamp improves efficiency and reduces RFI causing harmonics but induces a rapid deterioration of the lamp's performance.
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Lamps are light sources that emit incoherent light for illumination. There are many different types of products. Examples include fluorescent lamps, halogen lamps, heat lamps, incandescent lamps, LED lamps, projection lamps, spectral lamps, and stage lamps. Specialized and proprietary lamps are also available. Search by Specification | Learn more about Lamps
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Topics of Interest
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