Sign Applications With LEDs

• Full Color Video
• Monochrome Message Boards
• Traffic/VMS
• Transportation - Passenger Information

Light Emitting Diodes in VMS (Variable Message Signs) have been widely used and accepted since the late 1980's. This "single color" signage is visible in a myriad of applications including traffic management, commercial advertising, shopping malls and public transportation to name a few. It wasn't until the mid 1990's with the advent and cost reduction of high brightness InGaN blue LEDs that full color, RGB LED signs began their major entry into the video display market. Sign builders often face a variety of difficulties when integrating RGB technology into their video systems. These include:

• Patchiness due to variations in lamp brightness, forward voltage, color and/or far field pattern
• Heat dissipation issues due to clustering of LED lamps and direct ultra violet exposure
• Lamp malfunctions due to ESD (Electro Static Discharge)

LEDs For Indoor Or Outdoor Applications

Sanken Optoelectronics offers a variety of products and services to help our customers overcome these problems. One of which is the new "Screen Master" LED series provided by CREE. These LEDs are designed for either indoor or outdoor applications and insure:

• Consistency in brightness and color
• Uniform far field pattern across a large, open area
• Flexibility in chip usage. Innovative package technology where various chip/die can be used and matched for RGB patterns
• Excellent viewing angles

In addition to providing superior LEDs, Marktech has teamed up with TOSHIBA in developing Constant Current to support virtually all LED Display applications ranging from single color/monochromatic message boards to full color video displays.

« back to led applications