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LED Backlight Technology White Paper

From Densitron Corporation of America

This white paper was developed to provide an overview on backlight technologies. It is intended to help the reader better understand the different technologies along with the advantages and disadvantages. The paper begins with an introduction addressing the importance backlight technology plays in the design of Liquid Crystal Displays and then takes you through the various types of backlights. The technologies included are Electroluminescent (EL) lighting, LEDs, Fiber Optic, Array LEDs with Edge lit LED Lightguides, and Cold Cathode Fluorescent (CCFL) backlights. For each technology, the theory, structure, advantages and disadvantages are discussed. Backlights are used for electronic devices with flat panel displays that require illumination from the back and includes devices as small as hand held PCs or as large as big screen TVs. A typical backlight consist of a light source such as a Cold Cathode Fluorescent (CCFL) or Light Emitting Diodes (LED) and a rectangular light guide, which is also referred to as light pipe.
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