Japan launched the LED can minimize the number of light guide film

NEC electronics, an affiliate of the company, has launched a "light guide film" for the surface of the LIGHT, which has been used to efficiently illuminate the phone keys, and has been selling since July 2008.

According to the optical simulation results, the light guide pattern is formed on the optical film with thickness of only 0.1 ~ 0.2mm by screen printing. The light guide film end surface is provided with a luminous LED, so that the light of the LED is diffused, so that the key of the mobile phone is evenly distributed. This will reduce the number of LED equipped. The company said that the use of this light guide film and equipped with about 2 of the LED, with the use of light guide film and when equipped with 10 LED light, the former can achieve the same brightness and uniform emission characteristics.

This new product has 2 different manufacturing methods. The surface emitting type is adopted in the screen printing mode, and the side lighting type with special cutting process is adopted". The light emitting surface of the light guiding film is provided with an end surface luminous type LED, which can lead the light to pass from the end surface of the light conducting film. The incident light is reflected on the bottom surface of the light guiding film and the light guide pattern made of special reflecting material, so that the light is irradiated on the surface of the light guiding film. And the side light type is carried out on the light guide film based on optical simulation of the special groove processing, and in the end of the configuration of the end of the light type LED. The light is reflected by the half cylinder shaped cutting pattern to the side of the groove.

In addition, the company also put into operation on the 2mm thick acrylic board surface printed with the same light pattern of the LED packaging substrate light guide module". Its size is 150mm * 50mm. Equipped with a monochrome LCD backlight module on a vehicle mounted device.

New product performance indicators are customized according to customer requirements. The price of the sample, the mobile phone key light guide film is about 100 yen. The company plans in 2009 to reach about 1 million monthly production scale.

The principle of light emitting film

Side glowing semi cylindrical luminous pattern

Source: Nikkei BP