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issue: May 2005 APPLIANCE Magazine

Electronics Report
Blue LED Displays

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Kingbright has developed a Dual Blue SMD LED display that is said to offer additional flexibility in sizes and color, higher reliability, improved efficiency, and significant cost reduction to the production phase.

The Dual Blue SMD LED display from Kingbright Corporation (City of Industry, CA, U.S.) is said to offer a complete solution to designers requiring brilliant and crisp displaying features with high maneuverability.

In addition to their dual nature, the surface-mount device (SMD) displays are available in alphanumeric and single-digit APSA series with blue color selection. Man Yu, Kingbright engineering manager, says that the goal when designing the new devices was to revitalize the LED display arena with enhanced maneuverability and reliability for product designers that deal with super-thin membrane switch applications widely used in the appliance industry.

The new LED displays can be used in control panel backlighting and push button switches of refrigerators, dishwashers, consumer electronics, small electric appliances, medical, and commercial appliances. They are currently being used in dryers offered by a well-known U.S. appliance brand.

The displays are lightweight and feature a character height of
0.4 in and thickness of only 0.148 in, making them ideal for thin control panel designs. According to Mr. Yu, Kingbright engineers were able to keep weight low by utilizing lightweight epoxies and materials to build the reflectors and PCBs. The display’s compact form factor did, however, present some challenges. “A design challenge in creating these LED displays includes the wire and die-bonding of 14 to16 LED dice within a small area,” Mr. Yu explains. “Our R&D team designed a proprietary method to bond the reflector and PCB tightly together to eliminate any potential light-bleeding effects.”

The displays also reportedly offer extended life up to 100k/hr and an energy consumption rate that meets or exceeds Energy Star standards. “The LED displays are more reliable and efficient in that they operate at low voltage and low current for higher energy efficiency,” explains Mr. Yu “The display’s low heat dissipation feature also drastically improves the overall reliability of the electric circuit.”

A solid piece of protective epoxy covers the LED chips, making them resistant to harsh assembly environments and more reliable than traditional displays. In addition, the devices are packaged in an anti-static carrier tape that is said to be automation-friendly to most pick-and-place machines, which helps reduce the assembly time and manual labor involved in the production process. Operating temperatures range from -40°C to 85°C.

Suppliers mentioned in this article:
Kingbright Corporation

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