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Cold Cathode Fluorescent Lamps (CCFLs)

From JKL Components Corporation
 

 
Much attention has been given to the development of inverters to power Cold Cathode Fluorescent Lamps (CCFLs) to achieve high efficiency in portable products. CCFLs are found in an array of consumer, commercial, industrial, and military devices. An understanding of the lamps characteristics is essential for selection of the best CCFL and inverter for a given application. Being a mercury vapor discharge light source CCFLs can present design challenges, especially when low temperature operation is a design criteria. Aspects of temperature performance of the CCFL are examined. For an understanding of 3.0mm diameter CCFLs, which are increasingly found in LCD display modules, and to aid in the selection of a lamp diameter for a particular application, a comparison of photometric, electrical, and temperature characteristics are given for a 3.0mm and a 6.5mm lamp. Results of experimentation to enhance low temperature performance by increasing lamp current in relation to reduced lamp temperature are given. The means of lamp voltage and current measurement for the CCFLs tested is outlined.
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Light-emitting diodes (LED) are PN junction devices that give off light radiation when biased in the forward direction. LEDs are used in a wide variety of indication applications. Search by Specification | Learn more about Light Emitting Diodes (LED)
Fluorescent lamps are high-efficiency lamps that use electrical discharge through low-pressure mercury vapor to produce ultraviolet (UV) energy, which is then transformed into visible light. Search by Specification | Learn more about Fluorescent Lamps
Specialty or proprietary products and accessories related to lamps and light sources. Learn more about Specialty Lamps and Light Sources
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
Halogen lamps are high pressure incandescent lamps containing halogen gases such as iodine or bromine, which allow the filaments to be operated at higher temperatures and higher efficacies. Search by Specification | Learn more about Halogen Lamps
Product Announcements
Lumex, Inc. - High Intensity LED Backlights
Lumex's QuantumBrite™ line of LED backlights provide more than twice the intensity of traditional backlights. In particular, the white QuatumBrite LEDs provide high-intensity brightness of up to... (read more)
Elmet Technologies, Inc. - Lighting Components
Elmet Technologies offers a full array of lighting components both as a manufacturer and as the exclusive North American representative for Philips Lighting components produced globally. Their... (read more)
D/C Industries LLC. - CCFL INVERTERS
In addition to our standard range of LCD and CCFL Inverters AIC Engineers can develop customised CCFL Inverter solutions. (read more)
 
Topics of Interest
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)... (Read More)
DC/AC inverters designed to light Cold Cathode Fluorescent Lamps (CCFL's) are a very specific sub-class of inverters in general. These inverters tend to have very low output currents and very high... (Read More)
Most fluorescent lamps come in tubes of standard diameters, lengths, and wattage ratings. Diameters come in increments of ⅛ in, and standard lengths are 2, 3, 4, and 8 ft. The various... (Read More)
Before a fluorescent lamp lights or the arc is struck, it has high impedance as there are few current carriers. It takes a high voltage— Vns, the nominal striking voltage—to light the... (Read More)
16.1 Why High-Frequency Power Sources? High-frequency power sources for fluorescent lamps represent an enormously high-volume market for the technique of switching power supplies. This may be... (Read More)
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