Abstract: A light emitting diode (LED) includes an LED chip, a substrate structure, a fluorescence layer, and a lens. The substrate structure includes a cavity. The fluorescence layer covers on the LED chip and is configured in the cavity and covering the LED chip. The lens is installed on the substrate structure. The lens includes a curved lateral wall, a plane at the top, and a conical concave portion at the top center.

Abstract: An optical assembly includes a light source for generating and emitting light, a light guide plate, and a light transmissive plate. The light transmissive plate is disposed above the light guide plate and has a plurality of asymmetric V-shaped structures on a bottom surface thereof. The V-shaped structures may divert the light emitted from an optical element to exit at a collimation angle, thereby enhancing a light utilization, reducing loss of the light, and facilitating the enhancement of a positive gray level. Further, the optical assembly has a simple structure and a low cost.