# US 2018/0026153 A1 · Light-emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026153 A1 - Document ID: US20180026153A1 - Status: Published application - Kind: A1 - Application number: 15/672,452 - Filed: 2017-08-09 - Published: 2018-01-25 - Earliest claimed: 2002-01-18 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Mitsuaki OSAME; Aya ANZAI; Jun KOYAMA; Makoto UDAGAWA; Masahiko HAYAKAWA; Shunpei YAMAZAKI - Web page: https://patentgrep.com/patent/US20180026153A1 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors} - H10D 86/60: wherein the TFTs are in active matrices - H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies - H10K 59/1213: {the pixel elements being TFTs} - H10K 59/1216: {the pixel elements being capacitors} - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/0254: Control of polarity reversal in general, other than for liquid crystal displays - G09G 2320/043: Preventing or counteracting the effects of ageing - H10K 59/122: Pixel-defining structures or layers, e.g. banks - H10K 59/35: comprising red-green-blue [RGB] subpixels - 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) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A-light-emitting device which realizes a high aperture ratio and in which the quality of image is little affected by the variation in the characteristics of TFTs. The channel length of the driving TFTs is selected to be very larger than the channel width of the driving TFTs to improve current characteristics in the saturated region, and a high VGS is applied to the driving TFTs to obtain a desired drain current. Therefore, the drain currents of the driving TFTs are little affected by the variation in the threshold voltage. In laying out the pixels, further, wiring is arranged under the partitioning wall and the driving This are arranged under the wiring in order to avoid a decrease in the aperture ratio despite of an increase in the size of the driving TFT. ## Claims ### Claim 1 A display device comprising: a driving transistor including a gate electrode and a semiconductor layer; a current supply line electrically connected to the driving transistor; a gate signal line extending in a first direction; a source signal line extending in a second direction; a capacitor; and a light-emitting element electrically connected to the driving transistor, wherein the gate signal line and the source signal line intersect with each other, wherein the gate electrode is arranged under and overlaps with the current supply line, wherein a first length of the gate electrode along the first direction is shorter than a second length of the gate electrode along the second direction, wherein the semiconductor layer is arranged under and overlaps with the current supply line, wherein the semiconductor layer includes a portion in the shape of an S-shape or a meandering shape, wherein the portion is a channel-forming region, wherein the capacitor overlaps with the channel-forming region, and wherein the capacitor includes the gate electrode as one electrode of the capacitor and the current supply line as the other electrode of the capacitor. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the light-emitting element is provided between a substrate arid a plastic member. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the light-emitting element is provided over a substrate, and wherein light from the light-emitting element is directed toward the substrate. ### Claim 4 (depends on 1) The display device according to claim 1, wherein the current supply line extends in the second direction. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the driving transistor includes a channel length L and a channel width W and wherein L×W>200 μm2. ### Claim 6 (depends on 1) An electronic device comprising the display device according to claim 1. ### Claim 7 A display device comprising: a driving transistor including a gate electrode and a semiconductor layer; a current supply line electrically connected to the driving transistor; a gate signal line extending in a first direction; a first source signal line extending in a second direction; a second source signal line extending in the second direction; a capacitor; and a light-emitting element electrically connected to the driving transistor, wherein the gate signal line and the first source signal line intersect with each other, wherein the gate electrode is arranged under and overlaps with the current supply line, wherein a length of the gate electrode along the second direction is longer than a distance between the first source signal line and the second source signal line, wherein the semiconductor layer is arranged under and overlaps with the current supply line, wherein the semiconductor layer includes a portion in the shape of an S-shape or a meandering shape, wherein the portion is a channel-forming region, wherein the capacitor overlaps with the channel-forming region, and wherein the capacitor includes the gate electrode as one electrode of the capacitor and the current supply line as the other electrode of the capacitor. ### Claim 8 (depends on 7) The display device according to claim 7, wherein the light-emitting element is provided between a substrate and a plastic member. ### Claim 9 (depends on 7) The display device according to claim 7, wherein the light-emitting element is provided over a substrate, and wherein light from the light-emitting element is directed toward the substrate. ### Claim 10 (depends on 7) The display device according to claim 7, wherein the current supply line extends in the second direction. ### Claim 11 (depends on 7) The display device according to claim 7, wherein the driving transistor includes a channel length L and a channel width W, and wherein L×W>200 μm2. ### Claim 12 (depends on 7) An electronic device comprising the display device according to claim 7. ### Claim 13 A display device comprising: a driving transistor including a gate electrode and a semiconductor layer; a current supply line electrically connected to the driving transistor; a gate signal line extending in a first direction; a source signal line extending in a second direction; a capacitor; and a light-emitting element electrically connected to the driving transistor, wherein the gate signal line and the source signal line intersect with each other, wherein the gate electrode is arranged under and overlaps with the current supply line, wherein a first length of the gate electrode along the first direction is shorter than a second length of the gate electrode along the second direction, wherein the semiconductor layer is arranged under and overlaps with the current supply line, wherein the semiconductor layer includes a portion in the shape of an S-shape or a meandering shape, wherein the portion is a channel-forming region, wherein the capacitor overlaps with the channel-forming region, wherein the capacitor includes the gate electrode as one electrode of the capacitor and the current supply line as the other electrode of the capacitor, wherein the driving transistor includes a channel length L and a channel width W, and wherein L>5 W. ### Claim 14 (depends on 13) The display device according to claim 13, wherein the light-emitting element is provided between a substrate and a plastic member. ### Claim 15 (depends on 13) The display device according to claim 13, wherein the light-emitting element is provided over a substrate, and wherein light from the light-emitting element is directed toward the substrate. ### Claim 16 (depends on 13) The display device according to claim 13, wherein the current supply line extends in the second direction. ### Claim 17 (depends on 13) The display device according to claim 13, wherein L×W>200 μm2. ### Claim 18 (depends on 13) An electronic device comprising the display device according to claim 13. ### Claim 19 A display device comprising: a driving transistor including a gate electrode and a semiconductor layer; a current supply line electrically connected to the driving transistor; a gate signal line extending in a first direction; a first source signal line extending in a second direction; a second source signal line extending in the second direction; a capacitor; and a light-emitting element electrically connected to the driving transistor, wherein the gate signal line and the first source signal line intersect with each other, wherein the gate electrode is arranged under and overlaps with the current supply line, wherein a length of the gate electrode along the second direction is longer than a distance between the first source signal line and the second source signal line, wherein the semiconductor layer is arranged under and overlaps with the current supply line, wherein the semiconductor layer includes a portion in the shape of an S-shape or a meandering shape, wherein the portion is a channel-forming region, wherein the capacitor overlaps with the channel-forming region, wherein the capacitor includes the gate electrode as one electrode of the capacitor and the current supply line as the other electrode of the capacitor, wherein the driving transistor includes a channel length L and a channel width W, and wherein L>5 W. ### Claim 20 (depends on 19) The display device according to claim 19, wherein the light-emitting element is provided between a substrate and a plastic member. ### Claim 21 (depends on 19) The display device according to claim 19, wherein the light-emitting element is provided over a substrate, and wherein light from the light-emitting element is directed toward the substrate. ### Claim 22 (depends on 19) The display device according to claim 19, wherein the current supply line extends in the second direction. ### Claim 23 (depends on 19) The display device according to claim 19, wherein L×W>200 μm2. ### Claim 24 (depends on 19) An electronic device comprising the display device according to claim 19. ### Claim 25 A display device comprising: a driving transistor including a gate electrode and a semiconductor layer; a current supply line electrically connected to the driving transistor; a gate signal line extending in a first direction; a first source signal line extending in a second direction; a second source signal line extending in the second direction; a capacitor; and a light-emitting clement electrically connected to the driving transistor, wherein the gate signal line and the first source signal line intersect with each other, wherein the gate electrode is arranged under and overlaps with the current supply line, wherein a length of the gate electrode along the second direction is longer than a distance between the first source signal line and the second source signal line, wherein the semiconductor layer is arranged under and overlaps with the current supply line, wherein the semiconductor layer includes a portion in the shape of a U-shape or a spiral shape, wherein the portion is a channel-forming region, wherein the capacitor overlaps with the channel-forming region, wherein the capacitor includes the gate electrode as one electrode of the capacitor and the current supply line as the other electrode of the capacitor, wherein the driving transistor includes a channel length L and a channel width W, and wherein L>5%. ### Claim 26 (depends on 25) The display device according to claim 25, wherein the light-emitting element is provided between a substrate and a plastic member. ### Claim 27 (depends on 25) The display device according to claim 25, wherein the light-emitting element is provided over a substrate, and wherein light from the light-emitting element is directed toward the substrate. ### Claim 28 (depends on 25) The display device according to claim 25, wherein the current supply line extends in the second direction. ### Claim 29 (depends on 25) The display device according to claim 25, wherein L×W>200 μm2. ### Claim 30 (depends on 25) An electronic device comprising the display device according to claim 25.