# US 9,437,781 B2 · Light emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,781 B2 - Document ID: US9437781B2 - Status: Granted - Kind: B2 - Application number: 14/927,112 - Filed: 2015-10-29 - Published: 2016-05-05 - Granted: 2016-09-06 - Earliest claimed: 2014-10-29 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Se Yeon Jung; Yong Gyeong Lee - Web page: https://patentgrep.com/patent/US9437781B2 ## CPC - H10H 20/8312: {extending at least partially through the bodies} - H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures - H10H 20/8162: {Current-blocking structures} - H10H 20/833: Transparent materials - H10H 20/841: Reflective coatings, e.g. dielectric Bragg reflectors - H10H 20/819: characterised by their shape, e.g. curved or truncated substrates - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10W 74/00: Encapsulations, e.g. protective coatings - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract Disclosed is a light emitting device which includes a light emitting structure including a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer, a first current blocking layer, a second current blocking layer arranged on the light emitting structure to be separated from each other, a light-transmitting conductive layer arranged on the first current blocking layer, the second current blocking layer and the light emitting structure, first electrode and second electrode electrically coupled to the first conductive semiconductor layer and the second conductive semiconductor layer, respectively, a through hole formed through the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer to a portion of the first conductive semiconductor layer, and a through electrode arranged inside the through hole. Here, the through electrode does not overlap the first current blocking layer in a vertical direction. ## Claims ### Claim 1 A light emitting device comprising: a light emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer arranged in a vertical direction; a first current blocking layer and a second current blocking layer arranged on the light emitting structure to be separated from each other; a light-transmitting conductive layer arranged on the first current blocking layer and the second current blocking layer and the light emitting structure; a first electrode and a second electrode electrically coupled to the first semiconductor layer and the second conductive semiconductor layer, respectively; a through hole formed through the light-transmitting conductive layer, the second conductive semiconductor layer and the active layer to a portion of the first conductive semiconductor layer; and a through electrode arranged inside the through hole, wherein the through electrode extends from the first electrode, wherein the through electrode non-overlaps with the first current blocking layer in the vertical direction, and wherein the first electrode overlaps the first current blocking layer in the vertical direction. ### Claim 2 (depends on 1) The light emitting device of claim 1, further comprising an insulation layer arranged between the first electrode and the first current blocking layer and between the second electrode and the second current blocking layer. ### Claim 3 (depends on 2) The light emitting device of claim 2, wherein the through hole is formed through the insulation layer. ### Claim 4 (depends on 1) The light emitting device of claim 1, wherein the through electrode and the first current blocking layer are linearly arranged in a horizontal direction. ### Claim 5 (depends on 1) The light emitting device of claim 1, wherein the insulation layer is arranged in the through hole to extend around the through electrode. ### Claim 6 (depends on 1) The light emitting device of claim 1, wherein the first electrode comprises a first bonding pad and a first branched-finger electrode. ### Claim 7 (depends on 6) The light emitting device of claim 6, wherein the first bonding pad is arranged at a first edge region of the light emitting device. ### Claim 8 (depends on 6) The light emitting device of claim 6, wherein at least a portion of the first branched-finger electrode overlaps the through electrode and the first current blocking layer in the vertical direction. ### Claim 9 (depends on 1) The light emitting device of claim 1, wherein the through electrode has a length smaller than a distance between neighboring through electrodes. ### Claim 10 (depends on 1) The light emitting device of claim 1, wherein the second electrode comprises a second bonding pad and a second branched-finger electrode. ### Claim 11 (depends on 10) The light emitting device of claim 10, wherein the second bonding pad is arranged at a second edge region of the light emitting device. ### Claim 12 (depends on 10) The light emitting device of claim 10, wherein a portion of the second branched-finger electrode overlaps the second current blocking layer in the vertical direction. ### Claim 13 (depends on 1) The light emitting device of claim 1, wherein a portion of the insulation layer is opened to form an open region, and the light-transmitting conductive layer is exposed through the open region. ### Claim 14 (depends on 13) The light emitting device of claim 13, wherein the light-transmitting conductive layer and the second electrode are brought into direct contact at the open region. ### Claim 15 (depends on 13) The light emitting device of claim 13, wherein the open region and the through electrode are alternately arranged in a horizontal direction. ### Claim 16 (depends on 1) The light emitting device of claim 1, wherein at least one of the first current blocking layer and the second current blocking layer is a distributed Bragg reflector (DBR) or an omni-directional reflector (ODR). ### Claim 17 A light emitting device comprising: a light emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer; a first current blocking layer and a second current blocking layer having a DBR or ODR structure and arranged on the light emitting structure to be separated from each other; a light-transmitting conductive layer arranged on the first current blocking layer, the second current blocking layer and the light emitting structure and having the smallest thickness at regions corresponding respectively to the first current blocking layer and the second current blocking layer; a first electrode and a second electrode electrically coupled to the first conductive semiconductor layer and the second conductive semiconductor layer, respectively; a through hole formed through the light-transmitting conductive layer, the second conductive semiconductor layer, and the active layer to a portion of the first conductive semiconductor layer; and a through electrode arranged in the through hole. ### Claim 18 (depends on 17) The light emitting device of claim 17, wherein the first current blocking layer has a plurality of portions arranged spaced apart from each other. ### Claim 19 (depends on 18) The light emitting device of claim 18, wherein the through hole is formed through the light-transmitting conductive layer, the second conductive semiconductor layer, and the active layer to a portion of the first conductive semiconductor layer, the light emitting device further comprises a through electrode arranged in the through hole, and a spacing between the portions constituting the first current blocking layer is the same as a length of the through hole. ### Claim 20 A light emitting device comprising: a light emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer arranged in a vertical direction; a first current blocking layer and a second current blocking layer arranged on the light emitting structure to be separated from each other; a light-transmitting conductive layer arranged on the first current blocking layer and the second current blocking layer and the light emitting structure; a first electrode and a second electrode electrically coupled to the first semiconductor layer and the second conductive semiconductor layer, respectively; and an insulation layer arranged between the first electrode and the first current blocking layer and between the second electrode and the second current blocking layer, wherein a through hole is formed through the insulation layer, the light-transmitting conductive layer, the second conductive semiconductor layer, and the active layer to a portion of the first conductive semiconductor layer, wherein the through hole does not overlap the first current blocking layer in the vertical direction, wherein the first electrode overlaps the first current blocking layer in the vertical direction, wherein a portion of the insulation layer is opened to form an open region, and the light-transmitting conductive layer is exposed through the open region, and wherein the open region and the through hole are alternately arranged in a horizontal direction.