Abstract: The adjustable LED lens has a body having a light incident surface and a light-emitting surface respectively mounted on two opposite sides of the body. The light-emitting surface has a concave tapered surface. The adjustable LED lens is mounted on a holder. A distance between the adjustable LED lens and the holder is changeable. An LED is mounted on the holder, wherein a light generated by the LED passes through the light incident surface and the light-emitting surface of the body. The concave tapered surface of the light-emitting surface increases a light distribution angle to increase an illumination range and decrease a glare. The distance between the adjustable LED lens and the LED is changeable to adjust a light shape as desired.

Abstract: A backlight module is provided, comprising a light emitting diode (LED), a light guide plate and a fluorescence material. The fluorescence material is disposed in a transmission path of a first light or within the light guide plate. Then the fluorescence material is excited by the first light to generate one or more second lights. The first light and the second light are mixed or the second lights with different wavelengths are mixed to form a white light to generate a plane light source with a desired color temperature.