# US 2020/0396807 A1 · Display device and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0396807 A1 - Document ID: US20200396807A1 - Status: Published application - Kind: A1 - Application number: 17/005,714 - Filed: 2020-08-28 - Published: 2020-12-17 - Earliest claimed: 2014-07-31 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Hisao IKEDA; Nozomu SUGISAWA; Yuichi YANAGISAWA - Web page: https://patentgrep.com/patent/US20200396807A1 ## CPC - H10K 59/18: Tiled displays - H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces - G02F 1/133305: {Flexible substrates, e.g. plastics, organic film} - G02F 1/13336: {Combining plural substrates to produce large-area displays, e.g. tiled displays} - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/871: {Self-supporting sealing arrangements} - H10K 2102/311: {Flexible OLED} - Y02E 10/549: Organic PV cells - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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 - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A display device that can display an image along a curved surface is provided. In the display device, a first display panel and a second display panel overlap each other with a light-transmitting layer provided therebetween. The light-transmitting layer is positioned on a display surface side of the first display panel, and on a side opposite to the display surface of the second display panel. The light-transmitting layer has an average transmittance of 80% or more with respect to light in the wavelength range of 450 nm to 700 nm and a refractive index higher than that of air. A display region of the first display panel overlaps a region transmitting visible light of the second display panel with the light-transmitting layer provided therebetween. It is preferred that the display region of the first display panel not overlap with a region blocking visible light of the second display panel. ## Claims ### Claim 1 A display device comprising: a first display panel being at least partly flexible; and a second display panel being at least partly flexible, wherein the first display panel includes a first region and a second region, wherein the first region has a function of performing display, wherein the second region has a function of blocking visible light, wherein the second display panel includes a third region and a fourth region, wherein the third region has a function of performing display, wherein the fourth region has a function of transmitting visible light, wherein the third region is adjacent to the fourth region, wherein the second display panel is bent in the third region or in the fourth region, wherein the fourth region overlaps the first region, wherein a first flexible printed circuit is in contact with and electrically connected to the first display panel, and wherein a second flexible printed circuit is in contact with and electrically connected to the second display panel. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the first region includes a light-emitting element, wherein the third region includes a light-emitting element, and wherein the fourth region includes a bonding layer. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the second display panel includes a fifth region, wherein the fifth region is adjacent to the third region, wherein the fifth region has a function of blocking visible light, and wherein the fifth region does not include a region overlapping with the first region. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the fifth region functions as a wiring portion electrically connected to a light-emitting element included in the third region. ### Claim 5 (depends on 1) The display device according to claim 1, further comprising a light-transmitting layer, wherein the light-transmitting layer includes a light-transmitting material having a transmittance with respect to light in a wavelength range of 450 nm to 700 nm of 90% or more. ### Claim 6 (depends on 5) The display device according to claim 5, wherein the light-transmitting material has a refractive index of higher than or equal to 1.3 and lower than or equal to 1.8. ### Claim 7 (depends on 5) The display device according to claim 5, wherein the light-transmitting layer is detachably in contact with at least one of the first display panel and the second display panel. ### Claim 8 (depends on 5) The display device according to claim 5, wherein the light-transmitting layer includes an inert material. ### Claim 9 (depends on 5) The display device according to claim 5, wherein the light-transmitting layer includes a nonvolatile material. ### Claim 10 (depends on 5) The display device according to claim 5, wherein the light-transmitting layer has a material with a viscosity of greater than or equal to 1 mPa·s and less than or equal to 1000 Pa·s. ### Claim 11 (depends on 1) An electronic device comprising: the display device according to claim 1, and an antenna, a battery, a housing, a speaker, a microphone, an operation switch, or an operation button. ### Claim 12 A display device comprising: a first display panel being at least partly flexible; and a second display panel being at least partly flexible, wherein the first display panel includes a light-blocking region, wherein a part of the second display panel overlaps a part of the first display panel, wherein the second display panel is bent in a region having a function of performing display or a region overlapping with the first display panel, wherein a first flexible printed circuit is in contact with and electrically connected to the first display panel, and wherein a second flexible printed circuit is in contact with and electrically connected to the second display panel. ### Claim 13 (depends on 12) The display device according to claim 12, further comprising a light-transmitting layer, wherein the light-transmitting layer includes a light-transmitting material having a transmittance with respect to light in a wavelength range of 450 nm to 700 nm of 90% or more. ### Claim 14 (depends on 13) The display device according to claim 13, wherein the light-transmitting material has a refractive index of higher than or equal to 1.3 and lower than or equal to 1.8. ### Claim 15 (depends on 13) The display device according to claim 13, wherein the light-transmitting layer is detachably in contact with at least one of the first display panel and the second display panel. ### Claim 16 (depends on 13) The display device according to claim 13, wherein the light-transmitting layer includes an inert material. ### Claim 17 (depends on 13) The display device according to claim 13, wherein the light-transmitting layer includes a nonvolatile material. ### Claim 18 (depends on 13) The display device according to claim 13, wherein the light-transmitting layer has a material with a viscosity of greater than or equal to 1 mPa·s and less than or equal to 1000 Pa·s. ### Claim 19 (depends on 12) An electronic device comprising: the display device according to claim 12, and an antenna, a battery, a housing, a speaker, a microphone, an operation switch, or an operation button.