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Optoelectronics/Displays??

Oval LEDs target outdoor ESS market

Posted: 06 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Avago? HLMP-xx61? LEDs? AllnGaP? InGaN?

Avago Technologies has announced three new series of high-brightness full color LEDs for the outdoor electronic signs and signals (ESS) market. Avago's HLMP-xx61 series of oval shaped LED lamps have been specifically designed for use in full color outdoor stadium scoreboards, electronic bill boards, variable display signs, and traffic signals and signs. Other applications include outdoor video displays used to provide information or promote products and events in metropolitan areas.

Oval-shaped radiation pattern
According to Avago, the new LEDs provide an oval-shaped radiation pattern, a wide viewing angle and high illumination intensity to make display characters viewable from any angle in bright sunlight. Moreover, these LED lamps have a smooth, matched radiation pattern to ensure consistent color mixing in full color applications. These extra-bright LEDs are available in red, blue and green colors. Each lamp is made with advanced optical grade epoxy to offer superior high temperature and high moisture resistance in outdoor ESS applications, the company said.

Designers of electronic signs and signals are seeking higher brightness levels to reduce the number of LEDs in a cluster. With this new series of extra-bright oval through-hole LED lamps, electronic signs can be designed using fewer individual LEDs to provide equivalent brightness. Alternatively, signs can be designed with the same number of LEDs, providing substantially higher brightness levels for better readability and contrast. The lead spacing and packages are compatible with conventional high-brightness 5mm standard and miniature oval-pattern LED lamps. A series of 4mm standard oval-pattern LED lamps are also available.

The extra-bright HLMP-xx61 oval lamps are supplied in the company's precision optical performance molded packages, modified for higher current input and increased heat dissipation. The die is attached within the reflector cavity, and the cavity is encapsulated by an Avago proprietary ultraviolet-resistant epoxy blend. The packaging design coupled with carefully selected materials allows the lamps to perform with high reliability in a wide temperature range, Avago said, which is crucial for outdoor applications where the LED is exposed directly to ultraviolent radiation and humid environments.

Red, gree, blue versions
All HLMP-xx61 series LED lamps are available in red (AllnGaP; 630nm), green (InGaN; 525nm) and blue (InGaN; 470nm) in the following viewing angles:

  • 30 by 70, generally used for long-distance viewing in applications such as traffic signals

  • 40 by 100, for wide angle applications such as stadium scoreboards and other message signs

  • 50 by 100, 4mm package suitable for tight pixel pitch applications in indoor signs

The AllnGaP version operates over the -40C to 100C temperature range while the InGaN version operates over -40C to 85C.

Pricing for the HLMP-xx61 extra-bright oval LED lamps are 15 cents (red) 31 cents (blue and green) in 100,000-piece quantities. Samples and production quantities with a four-week lead time are currently available.




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