# US 10,502,889 B2 · Backlight unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,889 B2 - Document ID: US10502889B2 - Status: Granted - Kind: B2 - Application number: 15/577,896 - Filed: 2017-07-24 - Published: 2019-01-03 - Granted: 2019-12-10 - Earliest claimed: 2017-06-30 - Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd - Inventors: Huazhu Lei; Gege Zhou - Web page: https://patentgrep.com/patent/US10502889B2 ## CPC - G02B 6/0085: {Means for removing heat created by the light source from the package} - G02B 6/009: {of the light source in the package (G02B6/0021 takes precedence)} - G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels} - G02F 1/1336: {Illuminating devices} - G02F 1/133603: {with LEDs} - G02F 1/133608: {including particular frames or supporting means} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02F 1/133317: {Intermediate frames, e.g. between backlight housing and front frame} - G02F 1/133628: {with cooling means} - 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 The present invention provides a backlight unit including: a middle frame, a reflector disposed in the middle frame, a light guide plate provided on a surface of the reflector, and an LED light strip disposed at one side of the middle frame and opposite to a side edge of the light guide plate. The middle frame is formed with a heat radiating plate corresponding to the reflector and attached to a surface of the reflector at one side thereof. The heat radiating plate includes a heat radiating layer, a first cover layer and a second cover layer at two sides of the heat radiating layer. The first cover layer is opposite to the reflector, and the first cover layer is provided with a first notch for contacting a circuit board with the heat radiating layer at one side thereof adjacent to the LED light strip. ## Claims ### Claim 1 A backlight unit comprising: a middle frame; a reflector disposed in the middle frame; a light guide plate provided on a surface of the reflector; and an LED light strip disposed at one side of the middle frame and opposite to a side edge of the light guide plate, wherein the middle frame is formed with a heat radiating plate corresponding to the reflector and attached to a surface of the reflector at one side thereof, wherein the heat radiating plate comprises a heat radiating layer, a first cover layer and a second cover layer at two sides of the heat radiating layer, the first cover layer is opposite to the reflector, and the first cover layer is provided with a first notch for contacting a circuit board with the heat radiating layer at one side thereof adjacent to the LED light strip, and wherein the first notch causes the heat radiating layer to be exposed to form an exposed portion, and the circuit board and the exposed portion are attached to each other. ### Claim 2 (depends on 1) The backlight unit according to claim 1, wherein the second cover layer is provided with a first extension portion opposite to the LED light strip, and the first extension portion is attached to the middle frame. ### Claim 3 (depends on 1) The backlight unit according to claim 1, wherein the second cover layer is provided with a first extension portion opposite to the LED light strip, and the first extension portion is attached to the middle frame. ### Claim 4 (depends on 1) The backlight unit according to claim 1, wherein a filling portion for filling the first notch and being connected to the heat radiating layer is disposed in the first notch, the heat radiating layer is formed in an L-shape, and the filling portion and the circuit board are attached to each other. ### Claim 5 (depends on 3) The backlight unit according to claim 3, wherein the filling portion completely fills the first notch. ### Claim 6 (depends on 3) The backlight unit according to claim 3, wherein the filling portion partially fills the first notch, the second cover layer forms a contact portion at an edge thereof adjacent to the LED light strip, and the contact portion and the middle frame are attached to each other. ### Claim 7 (depends on 4) The backlight unit according to claim 4, wherein the filling portion and the radiating layer are made from same material. ### Claim 8 (depends on 5) The backlight unit according to claim 5, wherein the filling portion and the radiating layer are made from same material. ### Claim 9 (depends on 6) The backlight unit according to claim 6, wherein the filling portion and the radiating layer are made from same material. ### Claim 10 (depends on 7) The backlight unit according to claim 7, wherein a surface of the filling portion is flush with a surface of the first cover layer opposite to the reflector. ### Claim 11 (depends on 8) The backlight unit according to claim 8, wherein a surface of the filling portion is flush with a surface of the first cover layer opposite to the reflector. ### Claim 12 (depends on 9) The backlight unit according to claim 9, wherein a surface of the filling portion is flush with a surface of the first cover layer opposite to the reflector. ### Claim 13 (depends on 1) The backlight unit according to claim 1, wherein the heat radiating layer is made from graphite material. ### Claim 14 (depends on 1) The backlight unit according to claim 1, wherein the middle frame defines a second notch at one edge thereof adjacent to the LED light strip.