# US 9,039,221 B2 · Backlight unit and display apparatus using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,221 B2 - Document ID: US9039221B2 - Status: Granted - Kind: B2 - Application number: 14/151,928 - Filed: 2014-01-10 - Published: 2014-05-08 - Granted: 2015-05-26 - Earliest claimed: 2011-06-30 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Jung Ho Lee; Sung Yong Park - Web page: https://patentgrep.com/patent/US9039221B2 ## CPC - F21V 13/08: the elements being filters or photoluminescent elements and reflectors - F21V 7/00: Reflectors for light sources (characterised by cooling arrangements F21V29/505) - G02B 6/0096: {the lights guides being of the hollow type} - F21V 7/005: {with an elongated shape to cooperate with linear light sources} - F21V 15/01: Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04}) - G02B 6/0051: {Diffusing sheet or layer} - G02B 6/0086: {Positioning aspects} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02F 1/133605: {including specially adapted reflectors} - G02F 1/133608: {including particular frames or supporting means} - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 Disclosed are a backlight unit and a display apparatus using the same. The backlight unit includes first and second reflectors, a light source module, an optical member spaced apart from the second reflector, a first cover to come into contact with the second reflector and optical member, a second cover coupled to the first cover to support the light source module, and a third cover coupled to the first and second covers. The first cover includes a bottom plate, first lateral plates facing each other with respect to a first direction, second lateral plates facing each other in a second direction, a first coupling portion disposed at each first lateral plate and coupled to the second cover, a second coupling portion disposed at each second lateral plate and coupled to the optical member, and a third coupling portion disposed at each second lateral plate and coupled to the third cover. ## Claims ### Claim 1 A backlight unit comprising: first and second reflectors; at least one light source module disposed between the first reflector and the second reflector; an optical member disposed at a predetermined distance from the second reflector; a first cover configured to come into contact with the second reflector and the optical member; wherein the first cover includes: a bottom plate; first lateral plate disposed to face each other with respect to a first direction of the bottom plate; second lateral plate disposed to face each other in a second direction perpendicular to the first direction; and a plurality of pins arranged on an upper surface of the bottom plate and a lower surface of each pin has a greater area than an upper surface of the pin. ### Claim 2 (depends on 1) The backlight unit according to claim 1, wherein the first cover further includes a first coupling portion disposed at a lower portion of each first lateral plate so as to be coupled to the second cover. ### Claim 3 (depends on 2) The backlight unit according to claim 2, wherein the first coupling portion includes a plurality of ridge lines protruding from a lower surface of the first lateral plate. ### Claim 4 (depends on 3) The backlight unit according to claim 3, wherein the ridge lines are spaced apart from one another so as to be disposed in the first direction. ### Claim 5 (depends on 1) The backlight unit according to claim 1, wherein the first cover further includes a second coupling portion disposed at an upper portion of each second lateral plate so as to be coupled to the optical member, and a third coupling portion disposed at a lateral portion of each second lateral plate so as to be coupled to the third cover. ### Claim 6 (depends on 5) The backlight unit according to claim 5, wherein the second coupling portion and the third coupling portion are arranged to correspond to each other in a one to one ratio. ### Claim 7 (depends on 5) The backlight unit according to claim 5, wherein the second coupling portion protrudes from an upper surface of the second lateral plate, and the third coupling portion protrudes from a lateral surface of the second lateral plate. ### Claim 8 (depends on 5) The backlight unit according to claim 5, further comprising a third reflector disposed on an inner surface of each second lateral plate. ### Claim 9 (depends on 5) The backlight unit according to claim 5, wherein a plurality of ribs is disposed on an outer surface of each second lateral plate. ### Claim 10 (depends on 5) The backlight unit according to claim 5, wherein a height of the second lateral plates is greater than a height of the first lateral plates. ### Claim 11 (depends on 1) The backlight unit according to claim 1, further comprising a second cover coupled to the first cover to support the light source module; and a third cover coupled to both the first and second covers. ### Claim 12 (depends on 1) The backlight unit according to claim 1, wherein a plurality of ribs is arranged on a lower surface of the bottom plate. ### Claim 13 (depends on 1) The backlight unit according to claim 1, wherein an air guide is defined in a space between a bottom surface of the first cover and the optical member. ### Claim 14 A backlight unit comprising: first and second reflectors; at least one light source module disposed between the first reflector and the second reflector; an optical member disposed at a predetermined distance from the second reflector; a first cover configured to come into contact with the second reflector and the optical member; wherein the first cover includes: a bottom plate; first lateral plate disposed to face each other with respect to a first direction of the bottom plate; second lateral plate disposed to face each other in a second direction perpendicular to the first direction; and a plurality of ribs is disposed on an outer surface of each second lateral plate. ### Claim 15 (depends on 14) The backlight unit according to claim 14, wherein the second reflector is disposed above the bottom plate and the first lateral plates. ### Claim 16 (depends on 1) The backlight unit according to claim 1, wherein the first cover includes a first coupling portion disposed at a lower portion of each first lateral plate so as to be coupled to the second cover, a second coupling portion disposed at an upper portion of each second lateral plate so as to be coupled to the optical member, and a third coupling portion disposed at a lateral portion of each second lateral plate so as to be coupled to the third cover. ### Claim 17 (depends on 16) The backlight unit according to claim 16, wherein the second cover includes a fourth coupling portion disposed at a lower surface of the second cover so as to be coupled to the first cover, and a fifth coupling portion disposed at a lateral surface of the second cover so as to be coupled to the third cover. ### Claim 18 (depends on 16) The backlight unit according to claim 16, wherein the third cover includes sixth coupling portions disposed at opposite sides of the third cover so as be spaced apart from one another in the first direction, and seventh coupling portions disposed at opposite sides of the third cover so as to be spaced apart from one another in the second direction perpendicular to the first direction, wherein the sixth coupling portions are coupled to the second cover, and the seventh coupling portions are coupled to the first cover. ### Claim 19 (depends on 18) The backlight unit according to claim 18, wherein the third cover further includes eighth coupling portions arranged at a lower surface of the third cover to correspond to the seventh coupling portions in a one to one ratio, the eighth coupling portions being coupled to the first cover. ### Claim 20 A backlight unit comprising: first and second reflectors; at least one light source module disposed between the first reflector and the second reflector; an optical member disposed at a predetermined distance from the second reflector; a first cover configured to come into contact with the second reflector and the optical member; a second cover coupled to the first cover to support the light source module; and a third cover coupled to both the first and second covers, wherein the first cover includes: a bottom plate; first lateral plate disposed to face each other with respect to a first direction of the bottom plate; and second lateral plate disposed to face each other in a second direction perpendicular to the first direction, wherein the bottom plate includes at least one inclined surface, and the at least one inclined surface of the bottom plate includes a plurality of inclined surfaces arranged adjacent to each other about at least one inflection point and having different curvatures.