# US 10,769,997 B2 · Organic electroluminescent display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,769,997 B2 - Document ID: US10769997B2 - Status: Granted - Kind: B2 - Application number: 16/563,534 - Filed: 2019-09-06 - Published: 2019-12-26 - Granted: 2020-09-08 - Earliest claimed: 2006-02-27 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Naoki Tokuda; Hiroshi Kageyama; Masamitsu Furuie - Web page: https://patentgrep.com/patent/US10769997B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - H05B 33/04: Sealing arrangements {, e.g. against humidity} - H05B 44/00: Circuit arrangements for operating electroluminescent light sources (for operating light emitting diodes H05B45/00) - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/1315: {comprising structures specially adapted for lowering the resistance} - G09G 2300/0426: Layout of electrodes and connections - G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0257: Reduction of after-image effects - G09G 2320/0266: Reduction of sub-frame artefacts - G09G 2330/00: Aspects of power supply; Aspects of display protection and defect management - G09G 2330/02: Details of power systems and of start or stop of display operation - H10K 2102/311: {Flexible OLED} - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract The present invention overcomes image defects such as the brightness inclination or smears by reducing the line resistance of a power source bus line which supplies electricity to organic EL elements. A plurality of pixels which are arranged in a matrix array is connected to power source lines, and the plurality of power source lines are connected to a power source bus line. Both ends of the power source bus line are connected to a power source part via a FPC. By supplying electricity to both ends of the power source bus line from the power source part, the line resistance of the power source bus line can be reduced. ## Claims ### Claim 1 An organic EL display device including a display region comprising: a substrate; a plurality of pixels in the display region including a cathode; a first power source bus line electrically connected with the plurality of pixels, the first power source bus line comprising a first portion disposed along a first side of the display region, a second portion disposed along a second side of the display region, and a third portion disposed along a third side of the display region which is connecting the first side and the second side; a cathode contact electrically connecting the cathode, the cathode contact comprising a first portion extended along a fourth side of the display region which is facing the third side of the display region with the display region therebetween; and a scanning line drive circuit disposed along the third side of the display region, and transmitting scanning signals to the plurality of pixels, wherein the first power source bus line and the cathode contact are supplied with different voltage levels from each other, and the third portion of the first power source bus line is disposed between the display region and the scanning line drive circuit, and wherein the first portion, the second portion, and the third portion of the first power source bus line are positioned outside the display region. ### Claim 2 (depends on 1) The organic EL display device according to claim 1, wherein the first power source bus line further comprises a fourth portion disposed between the first portion of the cathode contact and the display region. ### Claim 3 (depends on 1) The organic EL display device according to claim 1, further comprising: a first flexible print circuit on a side of the substrate. ### Claim 4 (depends on 3) The organic EL display device according to claim 3, wherein the cathode contact further comprises a second portion which is disposed between the first portion of the first power source bus line and the first flexible print circuit. ### Claim 5 (depends on 3) The organic EL display device according to claim 3, wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit at both ends of the first portion the first power source bus line. ### Claim 6 (depends on 3) The organic EL display device according to claim 3, wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit through at least one portion disposed in a middle part of the first power source bus line. ### Claim 7 (depends on 3) The organic EL display device according to claim 3, further comprising a second flexible print circuit disposed on an opposite side of the substrate to the side where the first flexible print circuit is disposed. ### Claim 8 An organic EL display device including a display region comprising: a substrate; a plurality of pixels in the display region including a cathode; a first power source bus line electrically connected with the plurality of pixels, the first power source bus line comprising a first portion extended along a first side of the display region, and a second portion extended along a second side of the display region; a cathode contact electrically connecting the cathode, the cathode contact comprising a first portion disposed along a third side of the display region which is connecting the first side and the second side; and a scanning line drive circuit disposed along a fourth side of the display region which is facing the first side of the display region with the display region therebetween, wherein the first power source bus line and the cathode contact are supplied with different voltage levels from each other, and a voltage supplied to the second portion of the first power source bus line is transmitted only through the first portion of the first power source bus line, and wherein the first portion and the second portion of the first power source bus line are positioned outside the display region. ### Claim 9 (depends on 8) The organic EL display device according to claim 8, further comprising: a first flexible print circuit on a side of the substrate. ### Claim 10 (depends on 9) The organic EL display device according to claim 9, wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit at both ends of the first portion the first power source bus line. ### Claim 11 (depends on 9) The organic EL display device according to claim 9, wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit through at least one portion disposed in a middle part of the first power source bus line. ### Claim 12 (depends on 9) The organic EL display device according to claim 9, further comprising: a data line drive circuit transferring data signals to the plurality of pixels. ### Claim 13 (depends on 12) The organic EL display device according to claim 12, wherein the first power source bus line receives electricity from the first flexible print circuit through a first path disposed between the data line drive circuit and an edge of the substrate. ### Claim 14 (depends on 13) The organic EL display device according to claim 13, wherein the cathode contact receives a voltage from the first flexible print circuit through a second path disposed between the first path and the edge of the substrate. ### Claim 15 (depends on 14) The organic EL display device according to claim 14, wherein the edge of the substrate is adjacent to the third side of the display region. ### Claim 16 (depends on 13) The organic EL display device according to claim 13, wherein the scanning line drive circuit receives signals from first flexible print circuit through a third path disposed between the first path and the edge of the substrate. ### Claim 17 (depends on 16) The organic EL display device according to claim 16, wherein the edge of the substrate is adjacent to the fourth side of the display region. ### Claim 18 (depends on 9) The organic EL display device according to claim 9, wherein the voltage supplied to the second portion of the first power source bus line is transmitted from the first flexible print circuit only through the first portion of the first power source bus line. ### Claim 19 (depends on 8) The organic EL display device according to claim 8, wherein the first portion of the first power source bus line and the second portion of the first power source bus line are connected each other only on the display region.