Patent ID: 8545075
Filing Date: 2013-10-01
Classification: G02F

Abstract:
1. A backlight unit, comprising: a housing; a substrate formed in a single piece on the housing; a plurality of light emitting diodes on the substrate; a reflection sheet disposed on the substrate and including a plurality of holes; a fixing means coupling the reflection sheet, the substrate and the housing, and configured to reflect light; a plurality of optical receiving parts being formed of an optical fiber and disposed on the reflection sheet so as to detect light from the plurality of light emitting diodes; and a plurality of transmission lines disposed on the reflection sheet and configured to transmit light detected at the plurality of optical receiving parts into a color optical receiving sensor, wherein the plurality of light emitting diodes are inserted into the plurality of holes of the reflection sheet and a top portion of the plurality of light emitting diodes is protruded from a top surface of the reflection sheet, wherein a top portion of the plurality of holes in the reflection sheet has a larger width than an under portion of the plurality of holes, wherein the housing includes a slanted side surface and the slanted side surface of the housing is disposed at an outer side of the substrate, the plurality of light emitting diodes and the reflection sheet, so as to reflect light from the plurality of light emitting diodes, wherein each of the plurality of light emitting diodes is located at the center of each of the plurality of holes of the reflection sheet, respectively, and a minimum tolerance of a distance between each of the plurality of light emitting diodes and each of the plurality of holes of the reflection sheet, respectively, is equal to 0.001 mm, wherein a thickness of the reflection sheet is 50% to 90% of a height of the plurality of light emitting diodes, wherein the top portion of each of the plurality of light emitting diodes is formed in a hemisphere shape, and wherein each diameter of the plurality of holes at a center region in the reflection sheet is greater than each diameter of the plurality of holes at an outer region in the reflection sheet.