# US 10,770,482 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 10,770,482 B2 - Document ID: US10770482B2 - Status: Granted - Kind: B2 - Application number: 16/426,293 - Filed: 2019-05-30 - Published: 2019-12-12 - Granted: 2020-09-08 - Earliest claimed: 2018-06-06 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Susumu Kawashima; Naoto Kusumoto - Web page: https://patentgrep.com/patent/US10770482B2 ## CPC - H10D 86/60: wherein the TFTs are in active matrices - H10D 86/423: {comprising semiconductor materials not belonging to the Group IV, e.g. InGaZnO} - H10D 86/441: {Interconnections, e.g. scanning lines} - H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors} - H10F 39/802: {Geometry or disposition of elements in pixels, e.g. address-lines or gate electrodes} - H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout} - H10K 50/19: Tandem OLEDs - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/1216: {the pixel elements being capacitors} - H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT] - H10K 59/32: Stacked devices having two or more layers, each emitting at different wavelengths - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 59/351: {comprising more than three subpixels, e.g. red-green-blue-white [RGBW]} - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A display device capable of improving image quality with low power consumption is provided. A storage node is provided in each pixel and a first signal can be held in the storage node. A second signal is added to the first signal by capacitive coupling to generate a third signal. A display element operates in response to the third signal. Thus, regardless of the output voltage of a driver that supplies data, a high voltage can be supplied to the display element. Consequently, even a display element that requires a relatively high voltage for operation can operate with low power consumption. ## Claims ### Claim 1 A display device comprising a pixel, the pixel comprising: a first transistor, a second transistor, a third transistor, a first capacitor, and a circuit block comprising a light-emitting element, wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one electrode of the first capacitor, wherein the other electrode of the first capacitor is electrically connected to one of a source and a drain of the third transistor and the circuit block, wherein the other of the source and the drain of the first transistor and the other of the source and the drain of the third transistor are electrically connected to a first wiring, wherein a gate of the second transistor and a gate of the third transistor are electrically connected to a second wiring, and wherein the light-emitting element has a tandem structure where two or more light-emitting layers are connected in series. ### Claim 2 (depends on 1) The display device according to claim 1, wherein a channel formation region of the third transistor comprises a metal oxide comprising In and Zn. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the light-emitting element emits white light. ### Claim 4 (depends on 1) The display device according to claim 1, wherein the pixel comprises a first sub-pixel configured to emit red light, a second sub-pixel configured to emit blue light, a third sub-pixel configured to emit green light, and a fourth sub-pixel configured to emit white light. ### Claim 5 (depends on 1) An electronic device comprising the display device according to claim 1. ### Claim 6 A display device comprising a pixel, the pixel comprising: a first transistor, a second transistor, a third transistor, a first capacitor, a light-emitting element, a fourth transistor, and a second capacitor, wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one electrode of the first capacitor, wherein the other electrode of the first capacitor is electrically connected to one of a source and a drain of the third transistor, wherein the other of the source and the drain of the first transistor and the other of the source and the drain of the third transistor are electrically connected to a first wiring, wherein a gate of the second transistor and a gate of the third transistor are electrically connected to a second wiring, wherein a gate of the fourth transistor and one electrode of the second capacitor are electrically connected to the other electrode of the first capacitor, wherein one of a source and a drain of the fourth transistor is electrically connected to the light-emitting element, and wherein the light-emitting element has a tandem structure where two or more light-emitting layers are connected in series. ### Claim 7 (depends on 6) The display device according to claim 6, wherein the other electrode of the second capacitor is electrically connected to the one of the source and the drain of the fourth transistor. ### Claim 8 (depends on 6) The display device according to claim 6, wherein the other electrode of the second capacitor is electrically connected to the other of the source and the drain of the fourth transistor. ### Claim 9 (depends on 6) The display device according to claim 6, wherein a channel formation region of the third transistor comprises a metal oxide comprising In and Zn. ### Claim 10 (depends on 6) The display device according to claim 6, wherein the light-emitting element emits white light. ### Claim 11 (depends on 6) The display device according to claim 6, wherein the pixel comprises a first sub-pixel configured to emit red light, a second sub-pixel configured to emit blue light, a third sub-pixel configured to emit green light, and a fourth sub-pixel configured to emit white light. ### Claim 12 (depends on 6) An electronic device comprising the display device according to claim 6. ### Claim 13 A display device comprising a pixel, the pixel comprising: a first transistor, a second transistor, a third transistor, a first capacitor, a light-emitting element, a fourth transistor, a second capacitor, and a fifth transistor, wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor and one electrode of the first capacitor, wherein the other electrode of the first capacitor is electrically connected to one of a source and a drain of the third transistor, wherein the other of the source and the drain of the first transistor and the other of the source and the drain of the third transistor are electrically connected to a first wiring, wherein a gate of the second transistor and a gate of the third transistor are electrically connected to a second wiring, wherein a gate of the fourth transistor and one electrode of the second capacitor are electrically connected to the other electrode of the first capacitor, wherein one of a source and a drain of the fourth transistor is electrically connected to one of a source and a drain of the fifth transistor and the other electrode of the second capacitor, wherein the other of the source and the drain of the fifth transistor is electrically connected to the light-emitting element, and wherein the light-emitting element has a tandem structure where two or more light-emitting layers are connected in series. ### Claim 14 (depends on 13) The display device according to claim 13, wherein a channel formation region of the third transistor comprises a metal oxide comprising in and Zn. ### Claim 15 (depends on 13) The display device according to claim 13, wherein the light-emitting element emits white light. ### Claim 16 (depends on 13) The display device according to claim 13, wherein the pixel comprises a first sub-pixel configured to emit red light, a second sub-pixel configured to emit blue light, a third sub-pixel configured to emit green light, and a fourth sub-pixel configured to emit white light. ### Claim 17 (depends on 13) An electronic device comprising the display device according to claim 13.