Patent ID: 9207379
Filing Date: 2015-12-08
Classification: G02B

Abstract:
1. A light guide plate, comprising: a light emitting surface; and a plurality of side surfaces perpendicular to and connected to the light emitting surface, the plurality of side surfaces including at least one first side surface and at least one second side surface; and wherein the light guide plate further comprises: at least one set of folded surfaces perpendicular to and connected to the light emitting surface, in which each set of folded surfaces is connected between a different pair formed of the first side surface and the second side surface which are adjacent with each other, and each set of folded surfaces includes a plurality of light incident surfaces which are connected one by one, wherein, in the plurality of light incident surfaces in the same set of folded surfaces, any two adjacent light incident surfaces form an obtuse angle opened toward inside of the light guide plate, each set of folded surfaces includes a first light incident surface and a second light incident surface, wherein the first light incident surface is adjacent to and connected to the first side surface, and the second light incident surface is adjacent to and connected to the second side surface, and an acute angle between the first light incident surface and the plane to which the first side surface connected to the first light incident surface belongs is al, an acute angle between the second light incident surface and the plane to which the second side surface connected to the second light incident surface belongs is α2, and α1 and α2 satisfy conditions as follows: where R is the maximal refraction angle of light emitted from the light source for the light guide plate when the light is incident into the light guide plate.