# US 10,373,983 B2 · 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 10,373,983 B2 - Document ID: US10373983B2 - Status: Granted - Kind: B2 - Application number: 15/664,703 - Filed: 2017-07-31 - Published: 2018-02-08 - Granted: 2019-08-06 - Earliest claimed: 2016-08-03 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Kei Takahashi; Hiroyuki Miyake - Web page: https://patentgrep.com/patent/US10373983B2 ## CPC - H10D 86/60: wherein the TFTs are in active matrices - G09G 3/3225: using an active matrix - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - H10D 86/0212: {comprising manufacture, treatment or coating of substrates} - H10D 86/421: {having a particular composition, shape or crystalline structure of the active layer} - H10D 86/423: {comprising semiconductor materials not belonging to the Group IV, e.g. InGaZnO} - H10D 86/471: {having different architectures, e.g. having both top-gate and bottom-gate TFTs} - H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors} - G09G 3/3275: Details of drivers for data electrodes - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0465: Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2330/023: using energy recovery or conservation - G09G 2354/00: Aspects of interface with display user - G11C 19/28: using semiconductor elements (G11C19/14, G11C19/36 take precedence) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - 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) - G11C: STATIC STORES (semiconductor memory devices H10B) ## Abstract A display device including a display portion with an extremely high resolution is provided. The display device includes a pixel circuit and a light-emitting element. The pixel circuit includes a first element layer including a first transistor and a second element layer including a second transistor. A channel formation region of the first transistor includes silicon. The first transistor has a function of driving the light-emitting element. The second transistor functions as a switch. A channel formation region of the second transistor includes a metal oxide. The metal oxide functions as a semiconductor. The second element layer is provided over the first element layer. ## Claims ### Claim 1 A display device comprising: a pixel circuit including a first element layer comprising a first transistor and a second element layer comprising a second transistor; and a light-emitting element including a first conductive layer, an Electro-Luminescent (EL) layer over the first conductive layer, a second conductive layer, wherein a channel formation region of the first transistor comprises silicon, wherein a channel formation region of the second transistor comprises a metal oxide functioning as a semiconductor, wherein the first transistor is configured to drive the light-emitting element, wherein the second transistor functions is configured to operate as a switch for supplying voltage to a gate of the first transistor, wherein the second element layer is provided over the first element layer, wherein an insulating layer is provided on and in contact with an end portion of the first conductive layer, and wherein the EL layer is overlapping with the channel formation region of the first transistor, the channel formation region of the second transistor, and the insulating layer. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the second element layer further comprises a capacitor including a terminal electrically connected to the gate of the first transistor. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the second element layer further comprises a third transistor configured to operate as a switch for monitoring an amount of current flowing through the first transistor. ### Claim 4 (depends on 1) An electronic device comprising: the display device according to claim 1; a lens; an operation button; and a fixing member. ### Claim 5 A display device comprising: a pixel circuit including a first element layer comprising a first transistor and a second element layer comprising a second transistor; and a light-emitting element including a first conductive layer, an Electro-Luminescent (EL) layer over the first conductive layer, a second conductive layer, wherein a channel formation region of the first transistor comprises silicon, wherein a channel formation region of the second transistor comprises a metal oxide functioning as a semiconductor, wherein the first transistor is configured to drive the light-emitting element, wherein the second transistor functions is configured to operate as a switch for supplying voltage to a gate of the first transistor, wherein the second element layer is provided over the first element layer, wherein the light-emitting element is provided over the second element layers wherein an insulating layer is provided on and in contact with an end portion of the first conductive layer, and wherein the EL layer is overlapping with the channel formation region of the first transistor, the channel formation region of the second transistor, and the insulating layer. ### Claim 6 (depends on 5) The display device according to claim 5, wherein the second element layer further comprises a capacitor including a terminal electrically connected to the gate of the first transistor. ### Claim 7 (depends on 5) The display device according to claim 5, wherein the second element layer further comprises a third transistor configured to operate as a switch for monitoring an amount of current flowing through the first transistor. ### Claim 8 (depends on 5) An electronic device comprising: the display device according to claim 5; a lens; an operation button; and a fixing member. ### Claim 9 A display device comprising: a pixel circuit including a first element layer comprising a first transistor and a second element layer comprising a second transistor; a light-emitting element including a first conductive layer, an Electro-Luminescent (EL) layer over the first conductive layer, a second conductive layer; and a driver circuit comprising a fourth transistor, wherein a channel formation region of each of the First transistor and the fourth transistor comprises silicon, wherein a channel formation region of the second transistor comprises a metal oxide functioning as a semiconductor, wherein the first transistor is configured to drive the light-emitting element, wherein the second transistor functions is configured to operate as a switch for supplying voltage to a gate of the first transistor, wherein the second element layer is provided over the first element layer, wherein an insulating layer is provided on and in contact with an end portion of the first conductive layer, and wherein the EL layer is overlapping with the channel formation region of each of the first transistor and the fourth transistor, the channel formation region of the second transistor, and the insulating layer. ### Claim 10 (depends on 9) The display device according to claim 9, wherein the second element layer further comprises a capacitor including a terminal electrically connected to the gate of the first transistor. ### Claim 11 (depends on 9) The display device according to claim 9, wherein the second element layer further comprises a third transistor configured to operate as a switch for monitoring an amount of current flowing through the first transistor. ### Claim 12 (depends on 9) An electronic device comprising: the display device according to claim 9; a lens; an operation button; and a fixing member. ### Claim 13 A display device comprising: a pixel circuit including a first element layer comprising a first transistor and a second element layer comprising a second transistor; a light-emitting element including a first conductive layer an Electro-Luminescent (EL) layer over the first conductive layer, a second conductive layer; and a driver circuit comprising a fourth transistor, wherein a channel formation region of each of the first transistor and the fourth transistor comprises silicon, wherein a channel formation region of the second transistor comprises a metal oxide functioning as a semiconductor, wherein the first transistor is configured to drive the light-emitting element, wherein the second transistor functions is configured to operate as a switch for supplying voltage to a gate of the first transistor, wherein the second element layer is provided over the first element layer, wherein the light-emitting element is provided over the second element layer, wherein an insulating layer is provided on and in contact with an end portion of the first conductive layer, and wherein the EL layer is overlapping with the channel formation region of each of the first transistor and the fourth transistor, the channel formation region of the second transistor, and the insulating layer. ### Claim 14 (depends on 13) The display device according to claim 13, wherein the second element layer further comprises a capacitor including a terminal electrically connected to the gate of the first transistor. ### Claim 15 (depends on 13) The display device according to claim 13, wherein the second element layer further comprises a third transistor configured to operate as a switch for monitoring an amount of current flowing through the first transistor. ### Claim 16 (depends on 13) An electronic device comprising: the display device according to claim 13; a lens; an operation button; and a fixing member.