# US 11,307,715 B2 · Display device and touch sensing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,715 B2 - Document ID: US11307715B2 - Status: Granted - Kind: B2 - Application number: 16/009,688 - Filed: 2018-06-15 - Published: 2018-10-11 - Granted: 2022-04-19 - Earliest claimed: 2015-01-27 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Se Hyoung Cho; Kyung-Hoon Kim; Kang Moon Jo; Dong Woo Kim; Il Gon Kim - Web page: https://patentgrep.com/patent/US11307715B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G02F 1/13338: {Input devices, e.g. touch panels} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/044: by capacitive means - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - H10K 59/124: Insulating layers formed between TFT elements and OLED elements - H10K 59/40: OLEDs integrated with touch screens - H10W 90/00: Package configurations - G02F 1/133603: {with LEDs} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F 2203/04111: Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate - G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0852: being a dynamic memory with more than one capacitor - G09G 2320/0295: by monitoring each display pixel - H10K 59/873: {Encapsulations} - 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) - 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 - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract In a display device, a driving element is disposed on a rear substrate, and a passivation layer covers the driving element. A pixel electrode is disposed on the passivation layer and is connected to the driving element. An organic emission layer is disposed on the pixel electrode and is configured to emit light toward the rear substrate. A common electrode is disposed on the organic emission layer. A touch electrode is disposed between the rear substrate and the passivation layer, and it forms a capacitive component when an external touch occurs. ## Claims ### Claim 1 A display device comprising: a substrate; a driving element disposed on the substrate; a buffer layer disposed on and directly contacting the substrate; a gate insulating layer disposed on and directly contacting the buffer layer; a first passivation disposed on and directly contact the gate insulating layer; a second passivation layer disposed on and directly contact the first passivation layer, the second passivation layer covering the driving element; a pixel electrode disposed on and directly contacting the second passivation layer and connected to the driving element; an organic emission layer disposed on the pixel electrode and configured to emit light toward the substrate; a common electrode disposed on the organic emission layer; a touch electrode disposed between and directly contacting the substrate and the buffer layer and configured to form a capacitance with a touch object on the substrate; and a connection electrode extending through the buffer layer, the gate insulating layer, and the first passivation layer to directly contact the touch electrode, wherein the pixel electrode extends through the second passivation layer to directly contact the connection electrode. ### Claim 2 (depends on 1) The display device of claim 1, wherein the buffer layer is disposed between the substrate and the driving element. ### Claim 3 (depends on 1) The display device of claim 1, wherein the touch electrode overlaps the organic emission layer in a plan view and includes a transparent conductive material. ### Claim 4 (depends on 1) The display device of claim 1, wherein the touch electrode exposes the organic emission layer in a plan view and includes a reflective conductive material. ### Claim 5 (depends on 1) The display device of claim 1, wherein the connection electrode directly electrically connects the touch electrode to the pixel electrode. ### Claim 6 A display device comprising: a substrate; a driving element disposed on the substrate; a sensing element disposed on a same layer as the driving element and configured to transmit a sensing signal for sensing a touch; a passivation layer covering the driving element; a pixel electrode disposed on the passivation layer and connected to the driving element, wherein the passivation layer is between the substrate and the pixel electrode; an organic emission layer disposed on the pixel electrode and configured to emit light toward the substrate; a common electrode disposed on the organic emission layer; a touch electrode disposed between the substrate and the passivation layer and configured to form a capacitance with a touch object, wherein the touch electrode includes a semiconductor layer of the sensing element; and an auxiliary electrode disposed on a same layer as the pixel electrode and separated from the pixel electrode, wherein the auxiliary electrode is connected to the touch electrode. ### Claim 7 A display device comprising: a substrate; a driving element disposed on the substrate; a sensing element disposed on a same layer as the driving element and configured to transmit a sensing signal for sensing a touch; a passivation layer covering the driving element; a pixel electrode disposed on the passivation layer and connected to the driving element, wherein the passivation layer is between the substrate and the pixel electrode; a gate insulation layer disposed between the substrate and the passivation layer; an organic emission layer disposed on the pixel electrode and configured to emit light toward the substrate; a common electrode disposed on the organic emission layer; and a touch electrode disposed between the substrate and the passivation layer and configured to form a capacitance with a touch object, wherein the driving element includes a first gate electrode and a second gate electrode disposed on the first gate electrode, the first gate electrode and the second gate electrode being disposed between the substrate and the passivation layer, wherein the touch electrode and the first gate electrode are both directly disposed on a same surface of the gate insulation layer and are directly connected together.