Liquid crystal display device having uniform brightness

摘要

A liquid crystal display device has brightness uniformity at its front and lateral sides. The liquid crystal display device includes a reflection sheet reflecting light; an optical plate including a substrate for guiding light, a height-varying portion formed on one surface of the substrate, not facing the reflection sheet, and a prism pattern formed on the height-varying portion; and a plurality of light sources arranged on one lateral surface of the optical plate in a first direction so as to correspond to a position of the height-varying portion having a height not greater than an average height from the one surface of the substrate to the height-varying portion. The prism pattern extends in a second direction substantially perpendicular to the first direction. The average height is in a range of about 0.1% to about 10% of the thickness of the substrate.

主权项

1. A liquid crystal display device comprising:
a liquid crystal panel, a backlight assembly comprising an optical plate, and a plurality of light-emitting diode (LED) light sources, wherein the optical plate has a first surface substantially parallel to a bottom surface of the liquid crystal panel, and wherein the optical plate includes a height-varying portion formed on a second surface opposite the first surface and extending fully in a first direction between a first lateral surface and a second lateral surface of the optical plate, and a triangular prism pattern formed along the height-varying portion and extending in the first direction, wherein the plurality of LED light sources are arranged at a predetermined pitch in a second direction perpendicular to the first direction and facing a disposed directly on the first lateral surface of the optical plate, wherein at least one of the plurality of LED light sources is disposed facing thinner portions of the height-varying portion, and wherein the predetermined pitch corresponds to a distance measured between adjacent thinner portions of the height-varying portion.