Patent ID: 9116382
Filing Date: 2015-08-25
Classification: G02B,G02F

Abstract:
1. A liquid crystal display device comprising: a reflection sheet for reflecting light; an optical plate including a substrate for guiding light, and a plurality of prism patterns extending parallel to one another in a first direction on a first surface of the substrate, the prism patterns facing the reflection sheet; and a plurality of light sources arranged on a lateral surface of the optical plate in the first direction, wherein each of the prism patterns has a height-varying portion extending along its vertex, wherein each of the light sources is arranged so as to correspond to a position of the height-varying portion, and a height of the height-varying portion at the position is less than an average height of the prism patterns, wherein the height-varying portion comprises a plurality of convex portions each having a height greater than the average height of the prism patterns, and a plurality of concave portions each having a height less than the average height of the prism patterns and alternating with the convex portions, and wherein the plurality of light sources are point light sources, and a pitch between each of the plurality of light sources is substantially the same as a spacing between the concave portions.