The display illumination methods developed by POL, typically for LCD backlighting, have also been applied to the keypad illumination of mobile telecoms products and other similar applications.

Keypad lightguides of down to 0.5mm thickness are designed to give efficient light handling and even illumination intensity over the key pad area. Optical features are incorporated to manage the correct transport of the light through the keypad lightguide plane, then laser etched scattering patterns are applied to the mould tool surface to finally optimise the evenness of the keypad illumination.

This provides a very efficient, compact and cost effective solution with excellent illumination evenness.