LIGHTGUIDE FILM AND LIGHT EMITTING KEYPAD COMPRISING THE SAME

摘要

A waveguide film and a light emitting keypad having the same are provided to implement side view type LEDs and perform surface emitting through a thinner waveguide film. A light emitting keypad waveguide film(10) guides light made incident from a light source(40) and performs surface-emitting. A diffusion layer(13) is formed at the entire upper or lower surface of the waveguide film or at a portion corresponding to a key region of the light emitting keypad. The diffusion layer contains a light diffusing agent. The content of the light diffusing agent of the diffusion layer is increased as the light diffusing agent becomes away from the region where the light source of the keypad is positioned. The diffusion layer contains phosphor for increasing luminance while changing wavelength of light into long wavelength. The phosphor is selected from phosphor of YAG group, phosphor of a TAG group and phosphor of a silicate group.