| 主权项 |
1. A light guide module, configured to be adjacent to a light source capable of emitting an incident light, comprising:
a light guide plate having a light output surface and an light incident surface, the light incident surface being connected to an end of the light output surface, and the light incident surface being adjacent to and facing toward the light source for receiving the incident light; and a gradient index lens having a first surface, a second surface and a third surface with two ends which are opposite to each other, the first surface being parallel to and opposite to the second surface, the first surface and the second surface being connected to the two ends of the third surface, respectively, the first surface of the gradient index lens being attached to the light output surface of the light guide plate, and both the third surface of the gradient index lens and the light incident surface of the light guide plate facing toward the light source for receiving the incident light; wherein a plurality of internal refractive indexes of the gradient index lens is increased gradually from the first surface to the second surface, a minimum refractive index of the plurality of internal refractive indexes is less than a refractive index of the light guide plate, such that after the incident light enters the gradient index lens, the incident light is refracted a plurality of times within the gradient index lens, and totally reflected back to the light guide plate by the second surface of the gradient index lens. |
