# US 9,437,832 B2 · Light-emitting device and peeling method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,832 B2 - Document ID: US9437832B2 - Status: Granted - Kind: B2 - Application number: 14/621,914 - Filed: 2015-02-13 - Published: 2015-08-20 - Granted: 2016-09-06 - Earliest claimed: 2014-02-19 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Tatsuya Sakuishi; Yutaka Uchida; Hiroki Adachi; Saki Eguchi; Junpei Yanaka; Kayo Kumakura; Seiji Yasumoto; Kohei Yokoyama; Akihiro Chida - Web page: https://patentgrep.com/patent/US9437832B2 ## CPC - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 7/06: permitting easy separation - B32B 15/08: of synthetic resin - B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} - B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} - B32B 17/00: Layered products essentially comprising sheet glass, or glass, slag, or like fibres - B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} - B32B 27/20: using fillers, pigments, thixotroping agents - B32B 27/286: {comprising polysulphones; polysulfides} - B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers} - B32B 27/325: {comprising polycycloolefins} - B32B 27/34: comprising polyamides - B32B 27/36: comprising polyesters - B32B 27/365: {comprising polycarbonates} - B32B 37/02: characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations - B32B 37/10: characterised by the pressing technique, e.g. using action of vacuum or fluid pressure - B32B 37/18: involving the assembly of discrete sheets or panels only - B32B 38/10: Removing layers, or parts of layers, mechanically or chemically - H10K 59/873: {Encapsulations} - H10K 71/80: using temporary substrates - H10K 77/111: {Flexible substrates} - B32B 37/1292: {selectively, e.g. in stripes, in patterns (B32B37/0076 takes precedence)} - B32B 2250/05: 5 or more layers - B32B 2255/20: Inorganic coating - B32B 2260/021: Fibrous or filamentary layer - B32B 2260/046: Synthetic resin - B32B 2264/102: Oxide or hydroxide - B32B 2307/202: Conductive - B32B 2307/40: having particular optical properties - B32B 2307/50: having particular mechanical properties - B32B 2307/536: Hardness - B32B 2307/558: Impact strength, toughness - B32B 2310/0843: using laser - B32B 2315/08: Glass - B32B 2457/20: Displays, e.g. liquid crystal displays, plasma displays - H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour - H10K 2102/311: {Flexible OLED} - Y02E 10/549: Organic PV cells - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A flexible device is provided. The hardness of a bonding layer of the flexible device is set to be higher than Shore D of 70, or preferably higher than or equal to Shore D of 80. The coefficient of expansion of a flexible substrate of the flexible device is set to be less than 58 ppm/° C., or preferably less than or equal to 30 ppm/° C. ## Claims ### Claim 1 A light-emitting device comprising: a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; a second bonding layer between the second substrate and the element layer, wherein the element layer comprises a light-emitting element, wherein the first bonding layer comprises a first portion whose hardness is higher than Shore D of 70, wherein the second bonding layer comprises a second portion whose hardness is higher than Shore D of 70, wherein the first substrate comprises a third portion whose coefficient of expansion is less than 58 ppm/° C., and wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than 58 ppm/° C. ### Claim 2 (depends on 1) The light-emitting device according to claim 1, wherein the hardness of the first portion is higher than or equal to Shore D of 80, and wherein the hardness of the second portion is higher than or equal to Shore D of 80. ### Claim 3 (depends on 1) The light-emitting device according to claim 1, wherein the coefficient of expansion of the third portion is less than or equal to 30 ppm/° C., and wherein the coefficient of expansion of the fourth portion is less than or equal to 30 ppm/° C. ### Claim 4 (depends on 1) The light-emitting device according to claim 1, wherein the insulating layer comprises: a first silicon oxynitride film; a silicon nitride film over the first silicon oxynitride film; a second silicon oxynitride film over the silicon nitride film; a silicon nitride oxide film over the second silicon oxynitride film; and a third silicon oxynitride film over the silicon nitride oxide film. ### Claim 5 A light-emitting device comprising: a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; a second bonding layer between the second substrate and the element layer, wherein the element layer comprises a light-emitting element, wherein the first bonding layer comprises a first portion whose hardness is higher than or equal to Shore D of 80, wherein the second bonding layer comprises a second portion whose hardness is higher than or equal to Shore D of 80, wherein the first substrate comprises a third portion whose coefficient of expansion is less than or equal to 27 ppm/° C., and wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than or equal to 27 ppm/° C. ### Claim 6 (depends on 5) The light-emitting device according to claim 5, wherein the insulating layer comprises: a first silicon oxynitride film; a silicon nitride film over the first silicon oxynitride film; a second silicon oxynitride film over the silicon nitride film; a silicon nitride oxide film over the second silicon oxynitride film; and a third silicon oxynitride film over the silicon nitride oxide film. ### Claim 7 A light-emitting device comprising: a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; a second bonding layer between the second substrate and the element layer, wherein the element layer comprises a light-emitting element, wherein the first bonding layer comprises a first portion whose hardness is higher than Shore D of 70, wherein the second bonding layer comprises a second portion whose hardness is higher than Shore D of 70, wherein the first substrate comprises a third portion whose coefficient of expansion is less than 58 ppm/° C., wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than 58 ppm/° C., and wherein a display portion comprising the light-emitting element is a curved display portion. ### Claim 8 (depends on 7) The light-emitting device according to claim 7, wherein a display surface of the display portion is bent. ### Claim 9 (depends on 7) The light-emitting device according to claim 7, wherein a housing of the light-emitting device comprises a front surface and a side surface, and wherein the display portion comprises a region corresponding to the front surface and a region corresponding to the side surface. ### Claim 10 (depends on 7) The light-emitting device according to claim 7, wherein a housing of the light-emitting device comprises a front surface, a shorter side surface, and a longer side surface, and wherein the display portion comprises a region corresponding to the front surface, a region corresponding to the shorter side surface, and a region corresponding to the longer side surface. ### Claim 11 (depends on 7) A portable information terminal comprising the light-emitting device according to claim 7. ### Claim 12 A light-emitting device comprising: a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; a second bonding layer between the second substrate and the element layer, wherein the element layer comprises a light-emitting element, wherein the first bonding layer comprises a first portion whose hardness is higher than Shore D of 70, wherein the second bonding layer comprises a second portion whose hardness is higher than Shore D of 70, wherein the first substrate comprises a third portion whose coefficient of expansion is less than 58 ppm/° C., wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than 58 ppm/° C., and wherein the light-emitting device is a foldable light-emitting device. ### Claim 13 (depends on 12) The light-emitting device according to claim 12, wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface face each other. ### Claim 14 (depends on 12) The light-emitting device according to claim 12, wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface do not face each other. ### Claim 15 (depends on 12) The light-emitting device according to claim 12, wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface face each other and the second region of the display surface and a third region of the display surface do not face each other. ### Claim 16 (depends on 12) A portable information terminal comprising the light-emitting device according to claim 12. ### Claim 17 A light-emitting device comprising: a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; a second bonding layer between the second substrate and the element layer, wherein the element layer comprises a light-emitting element, wherein the first bonding layer comprises a first portion whose hardness is higher than or equal to Shore D of 80, wherein the second bonding layer comprises a second portion whose hardness is higher than or equal to Shore D of 80, wherein the first substrate comprises a third portion whose coefficient of expansion is less than or equal to 27 ppm/° C., wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than or equal to 27 ppm/° C., and wherein a display portion comprising the light-emitting element is a curved display portion. ### Claim 18 (depends on 17) The light-emitting device according to claim 17, wherein a display surface of the display portion is bent. ### Claim 19 (depends on 17) The light-emitting device according to claim 17, wherein a housing of the light-emitting device comprises a front surface and a side surface, and wherein the display portion comprises a region corresponding to the front surface and a region corresponding to the side surface. ### Claim 20 (depends on 17) The light-emitting device according to claim 17, wherein a housing of the light-emitting device comprises a front surface, a shorter side surface, and a longer side surface, and wherein the display portion comprises a region corresponding to the front surface, a region corresponding to the shorter side surface, and a region corresponding to the longer side surface. ### Claim 21 (depends on 17) A portable information terminal comprising the light-emitting device according to claim 17. ### Claim 22 A light-emitting device comprising: a first substrate having flexibility; a second substrate having flexibility; an element layer between the first substrate and the second substrate; an insulating layer between the first substrate and the element layer; a first bonding layer between the first substrate and the insulating layer; a second bonding layer between the second substrate and the element layer, wherein the element layer comprises a light-emitting element, wherein the first bonding layer comprises a first portion whose hardness is higher than or equal to Shore D of 80, wherein the second bonding layer comprises a second portion whose hardness is higher than or equal to Shore D of 80, wherein the first substrate comprises a third portion whose coefficient of expansion is less than or equal to 27 ppm/° C., wherein the second substrate comprises a fourth portion whose coefficient of expansion is less than or equal to 27 ppm/° C., and wherein the light-emitting device is a foldable light-emitting device. ### Claim 23 (depends on 22) The light-emitting device according to claim 22, wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface face each other. ### Claim 24 (depends on 22) The light-emitting device according to claim 22, wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface do not face each other. ### Claim 25 (depends on 22) The light-emitting device according to claim 22, wherein the light-emitting device is foldable so that a first region of a display surface of the light-emitting device and a second region of the display surface face each other and the second region of the display surface and a third region of the display surface do not face each other. ### Claim 26 (depends on 22) A portable information terminal comprising the light-emitting device according to claim 22.