50.采用导光膜和 LED 的创新键盘设计

50.采用导光膜和 LED 的创新键盘设计
Innovate Keypad Design
With Light Guides and LEDs

White Paper




Introduction
A light guide transmits light with high uniformity and
minimal loss from an LED light source to a particular area
away from its light source. Light guides are made from
optical grade material such as acrylic resin, polycarbonate,
6x Top-red
epoxies and glass. LED
This white paper describes light guide technology and
applications.

Light Guides and LEDs for Mobile Phone Keypad
Backlighting
In a keypad backlight application, a light guide reduces Figure 1. Conventional keypad backlight with six top-re LEDs
the number of illumination LEDs witho