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Rohm Expands Colours of ultra Compact LEDs

Contributes to improved design flexibility in wearables, drones, and other devices

Rohm has added seven new intermediate colours to its PICOLED series of low profile, ultra-compact chip LEDs optimised for wearable tech, portable devices, and drones, allowing for greater colour expression and improved design freedom.

The number of applications using LEDs in conjunction with a notification function has grown significantly along with demand for greater miniaturisation. In response, Rohm developed the SML-P1 series of compact chip LEDs using its strengths in element technology to eliminate wavelength variations that in the past have proven problematic. As a result, Rohm has been able to increase the number of colours from eight to 15.

In addition, combining a lower gold wire loop with a thinner light emitting element (developed using proprietary technology) makes it possible to achieve a thin form factor of 0.2mm, contributing to greater compactness, lower profile and weight saving in mobile applications.

By taking into consideration usage conditions during reflow, Rohm has also prevent solder intrusion into the resin by implementing penetration countermeasures within the package itself. This is expected to prevent failures caused by solder infiltration during the customer's soldering process, improving reliability considerably.

Going forward, Rohm says it will focus on strengthening its PICOLED lineup to include high brightness types as well as expand its lineup of RGB LEDs capable of improved colour mixing.

The small package size (1.0x0.6mm) and lightweight design (0.2mg) meets the need for weight reduction demanded by portable devices and drones, according to the company.

In addition, package miniaturisation technology makes it possible to position the light emitting element in a 0.6mmx0.6mm square area, providing square emission characteristics ideal for dot matrix displays. 

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