Patent ID: 8908124
Filing Date: 2014-12-09
Classification: G02B

Abstract:
1. A light guide plate for a backlight unit of a liquid crystal display device, comprising: one side surface where light from a first light source is incident; the other side surface opposite to the one side surface; a front surface combining the one and the other side surfaces; a rear surface including a plurality of light guide patterns, each of the plurality of light guide patterns including a protruding portion and a groove portion; and flat portions located between adjacent ones of the plurality of light guide patterns, wherein one of the protruding portion and the groove portion is positioned at a center of the other one of the protruding portion and the groove portion, and the protruding portion protrudes outwardly from the rear surface, wherein, with respect to the front surface, the rear surface of the flat portion has a height smaller than that of the protruding portion and greater than that of the groove portion, wherein a surface of the groove portion is entirely flat and parallel with the rear surface of the flat portion, wherein a surface of the protruding portion is entirely flat and parallel with the rear surface of the flat portion, and wherein the one of the protruding portion and the groove portion has a width being one-third or half of a width of the other one of the protruding portion and the groove portion and wherein each protruding portion is surrounded by its own individual groove portion and the same groove portion does not surround another protruding portion.