Patent ID: 9140829
Filing Date: 2015-09-22
Classification: G02B,G02F

Abstract:
1. A backlight unit comprising: a light source configured to generate a light; a light guide panel configured to guide the light incident thereon from the light source, the light guide panel having an upper pattern which is formed on a front side thereof for emitting the light guided thus upwards and a lower pattern which is formed on a backside thereof for reflecting or refracting the light; and a prism sheet on a front of the light guide panel, wherein the lower pattern of the light guide panel is formed in an intaglio pattern to be recessed into the light guide panel, and having a vertical angle at which two inclined planes meet, and one of the two inclined planes the light from the light source incident thereon has an angle of 45˜55°, wherein the prism sheet includes: a base film; and a prism portion formed on a front of the base film having a continuous arrangement of mountain patterns and valley patterns arranged parallel to the upper pattern of the light guide panel, and wherein the light guide panel includes a plurality of lower patterns, the plurality of lower patterns are arranged in one of zigzag pattern and a line pattern, and a ratio of a height of the lower pattern to a width of the lower pattern is 0.2˜0.5.