# US 2019/0172985 A1 · Light source module and backlight unit having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0172985 A1 - Document ID: US20190172985A1 - Status: Published application - Kind: A1 - Application number: 16/256,712 - Filed: 2019-01-24 - Published: 2019-06-06 - Earliest claimed: 2013-05-09 - Assignees: Seoul Semiconductor Co., Ltd. - Applicants: Seoul Semiconductor Co., Ltd. - Inventors: Young Jun SONG; Da Hye Kim; Seoung Ho Jung - Web page: https://patentgrep.com/patent/US20190172985A1 ## CPC - H10H 20/8514: {characterised by their shape, e.g. plate or foil} - G02B 6/0073: {Light emitting diode [LED]} - H10H 20/856: Reflecting means - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - 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 A backlight unit including a light guide plate, a first light source and a second light source adjacent to the light guide plate, each of the light sources including a light emitting diode chip including a substrate and a semiconductor stack disposed on the substrate, a wavelength conversion layer covering the light emitting diode chip, and a plurality of reflectors disposed on at least two opposing side surfaces of the light emitting diode chip, in which at least a portion of the wavelength conversion layer of the first light source facing the second light source is exposed by the reflectors. ## Claims ### Claim 1 A backlight unit comprising: a light guide plate; a first light source and a second light source adjacent to the light guide plate, each of the light sources comprising: a light emitting diode chip comprising a substrate and a semiconductor stack disposed on the substrate; a wavelength conversion layer covering the light emitting diode chip; and a plurality of reflectors disposed on at least two opposing side surfaces of the light emitting diode chip, wherein at least a portion of the wavelength conversion layer of the first light source facing the second light source is exposed by the reflectors. ### Claim 2 (depends on 1) The backlight unit of claim 1, wherein the first and second light sources face each other through a surface on which the reflectors are not disposed, respectively. ### Claim 3 (depends on 1) The backlight unit of claim 1, wherein the reflectors comprise a first reflector and a second reflector, the first and second reflectors disposed on a substantially same plane as top and bottom surfaces of the light guide plate, respectively. ### Claim 4 (depends on 1) The backlight unit of claim 1, wherein the first and second light sources are disposed along a longitudinal direction of the substrate with a first interval therebetween. ### Claim 5 (depends on 4) The backlight unit of claim 4, wherein: the wavelength conversion layer has a first surface facing a light entering surface of the light guide plate, and second side surfaces opposing each other; and the first surface and the second side surfaces are exposed by the reflectors. ### Claim 6 (depends on 1) The backlight unit of claim 1, wherein: the wavelength conversion layer includes a first region disposed on an upper surface of the light emitting diode chip, and a second region disposed on side surfaces of the light emitting diode chip; and the first region and the second region have the same thickness. ### Claim 7 (depends on 1) The backlight unit of claim 1, wherein: the wavelength conversion layer includes a first region disposed on an upper surface of the light emitting diode chip, and a second region disposed on side surfaces of the light emitting diode chip; and the first region has a greater thickness than the second region. ### Claim 8 (depends on 1) The backlight unit of claim 1, wherein one end of the reflector faces the light guide plate and the other end thereof faces the substrate. ### Claim 9 (depends on 1) The backlight unit of claim 1, wherein a surface of the wavelength conversion layer interfacing the reflector has a convex-concave pattern. ### Claim 10 (depends on 1) The backlight unit of claim 1, wherein the reflector comprises at least one of a resin coated with a reflective layer and a resin including a reflective material. ### Claim 11 A backlight unit comprising: a light guide plate having a substantially flat shape; and at least one light source disposed adjacent to the light guide plate, the light source comprising; a semiconductor stack; a wavelength conversion layer covering the semiconductor stack; and a reflective unit disposed on at least one side surfaces of the wavelength conversion layer. ### Claim 12 (depends on 11) The backlight unit of claim 11, wherein the reflective unit comprises: a first reflector disposed on a first surface of the light source, the first surface being disposed on a substantially the same plane as an upper surface of the light guide plate; and a second reflector disposed on a second surface of the light source, the second surface being disposed on a substantially the same plane as a bottom surface of the light guide plate. ### Claim 13 (depends on 12) The backlight unit of claim 12, further comprising a printed circuit board (PCB), wherein: the light source is provided in plural on the PCB; and the reflective unit of each light source covers each side surface of the wavelength conversion layer that contacts the PCB and is substantially parallel to a longitudinal direction of the PCB. ### Claim 14 (depends on 11) The backlight unit of claim 11, wherein a surface of the wavelength conversion layer interfacing the reflective unit has a convex-concave pattern. ### Claim 15 (depends on 14) The backlight unit of claim 14, wherein the reflective unit comprises at least one of a resin coated with a reflective layer and a resin including a reflective material. ### Claim 16 (depends on 11) The backlight unit of claim 11, wherein an upper surface of the reflective unit is flush with an upper surface of the wavelength conversion layer. ### Claim 17 (depends on 16) The backlight unit of claim 16, wherein a lower surface of the reflective unit is flush with a lower surface of the wavelength conversion layer. ### Claim 18 (depends on 12) The backlight unit of claim 12, wherein the first and second reflectors are not disposed on a surface of the light source that faces an adjacent light source.