# US 8,786,805 B2 · Backlight unit and image display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,805 B2 - Document ID: US8786805B2 - Status: Granted - Kind: B2 - Application number: 13/420,118 - Filed: 2012-03-14 - Published: 2012-11-22 - Granted: 2014-07-22 - Earliest claimed: 2011-05-16 - Assignees: LG Innotek Co., Ltd. - Applicants: Doohee Kim - Inventors: Doohee Kim - Web page: https://patentgrep.com/patent/US8786805B2 ## CPC - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A backlight unit according to embodiment comprise of a frame, a light emitting device module disposed on a side of the frame and a plurality of light guide members disposed in the direction of the light irradiated from the light emitting device, wherein the light guide members have light transmissivity and reflectivity different from each other. ## Claims ### Claim 1 A backlight unit comprising: a frame; a light emitting device module disposed on a side of the frame; and a plurality of light guide members disposed in a direction of the light irradiated from the light emitting device, wherein the light guide members have light transmissivity and reflectivity different from each other. ### Claim 2 (depends on 1) The backlight unit according to claim 1, wherein the plurality of light guide members comprises a beam splitter for transmitting a part of the light and reflecting the other part of the light. ### Claim 3 (depends on 1) The backlight unit according to claim 1, further comprising a reflection sheet interposed between the frame and the plurality of light guide members. ### Claim 4 (depends on 1) The backlight unit according to claim 1, wherein the light guide member has larger light transmissivity as it closes to the light emitting device module. ### Claim 5 (depends on 1) The backlight unit according to claim 1, wherein the light guide member has smaller light transmissivity as it closes to the light emitting device module. ### Claim 6 (depends on 1) The backlight unit according to claim 1, wherein the plurality of light guide members are apart from each other with an uniform separation distance. ### Claim 7 (depends on 1) The backlight unit according to claim 1, wherein the light guide member has curvature. ### Claim 8 (depends on 1) The backlight unit according to claim 1, wherein the frame comprises a bottom part and a light-source supporting part bent to the bottom part, wherein the plurality of light guiding members are disposed on the bottom part, and wherein the light emitting device module is disposed on the light-source supporting part. ### Claim 9 (depends on 8) The backlight unit according to claim 8, wherein the light guide member comprises a first side that is adjacent to the bottom part and a second side that is apart from the first side, and wherein a distance between the first side and the light emitting device module is smaller than that between the second side and the light emitting device module. ### Claim 10 (depends on 1) The backlight unit according to claim 1, wherein the light guide member is inclined to the frame with an angle. ### Claim 11 (depends on 1) The backlight unit according to claim 1, wherein inclination angles between the light guide members and the frame are the same. ### Claim 12 (depends on 1) The backlight unit according to claim 1, wherein the plurality of light guide members are apart from each other with a predetermined separation distance and the predetermined separation distance is shorter as the light guide member is far from the light emitting device module. ### Claim 13 (depends on 1) The backlight unit according to claim 1, further comprising an optical sheet disposed on the plurality of light guide members, wherein the optical sheet is apart from the plurality of light guide members. ### Claim 14 A backlight unit comprising: a frame; a light emitting device module disposed on a first side and a second side of the frame; and a plurality of light guide members inclined to the frame, wherein the light guide members have light transmissivity and reflectivity different from each other. ### Claim 15 (depends on 14) The backlight unit according to claim 14, wherein an inclination direction of first light guide members of the plurality of light guide members between the first side and a center of the frame is opposite to an inclination direction of second light guide members of the plurality of light guide members between the second side and the center of the frame. ### Claim 16 (depends on 14) The backlight unit according to claim 14, wherein the light guide member has a larger light transmissivity as the light guide member is far from a center of the frame. ### Claim 17 (depends on 14) The backlight unit according to claim 14, wherein the light guide member has a smaller light transmissitivity as the light guide member is far from a center of the frame. ### Claim 18 (depends on 14) The backlight unit according to claim 14, the plurality of light guide members are apart from each other with an uniform separation distance. ### Claim 19 (depends on 14) The backlight unit according to claim 14, the plurality of light guide members are apart from each other with a different separation distance. ### Claim 20 An image display apparatus comprising: a back light unit including a frame, a light emitting device module disposed on a side of the frame and a plurality of light guide members disposed in the direction of the light irradiated from the light emitting device, wherein the light guide members have light transmissivity and reflectivity different from each other; and a liquid crystal display panel disposed on the backlight unit, wherein the liquid crystal comprising a color filter substrate and a thin film transistor substrate opposite to each other.