# US 8,541,804 B2 · Electro-optical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,804 B2 - Document ID: US8541804B2 - Status: Granted - Kind: B2 - Application number: 13/563,796 - Filed: 2012-08-01 - Published: 2013-01-10 - Granted: 2013-09-24 - Earliest claimed: 2000-03-27 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Hajime Kimura - Inventors: Hajime Kimura - Web page: https://patentgrep.com/patent/US8541804B2 ## CPC - G09G 3/3225: using an active matrix - G09G 3/2022: {using sub-frames} - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 85/30: Coordination compounds - G09G 3/2018: {by time modulation using two or more time intervals} - G09G 3/325: the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver - 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 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2300/0876: Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes - G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage - G09G 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes - G09G 2310/06: Details of flat display driving waveforms - G09G 2310/061: for resetting or blanking - H10K 59/12: Active-matrix OLED [AMOLED] displays - H10K 59/1213: {the pixel elements being TFTs} - H10K 85/311: {Phthalocyanine} - H10K 85/341: {Transition metal complexes, e.g. Ru(II)polypyridine complexes (H10K85/331 takes precedence)} - H10K 85/60: Organic compounds having low molecular weight (H10K85/10 - H10K85/50 take precedence) - H10K 2102/3026: {Top emission} - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract An object of the present invention is to realize a numerical aperture higher than that of a pixel having a conventional construction by using a pixel circuit having a novel construction in an electro-optical device. Therefore, it is utilized that the electric potential of a gate signal line in a row except for an i-th row is set to a constant electric potential in a period except for when a gate signal line (106) in the i-th row is selected. A gate signal line 111 in an (i−1)-th row is also used as an electric current supply line for an EL element (103) controlled by the gate signal line (106) in the i-th row. Thus, wiring number is reduced and high numerical aperture is realized. ## Claims ### Claim 1 A display device comprising: a first pixel comprising: a first transistor; a second transistor; a capacitor; an electro luminescence element comprising a white light emitting layer; and a color filter provided corresponding to the electro luminescence element, wherein a gate of the first transistor is electrically connected to a first wiring, wherein one of a source and a drain of the first transistor is electrically connected to a gate electrode of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a second wiring through a connecting electrode, wherein one of a source and a drain of the second transistor is electrically connected to the electro luminescence element, wherein the other of the source and the drain of the second transistor is electrically connected to a third wiring, wherein a first terminal of the capacitor is electrically connected to the gate of the second transistor, wherein the first wiring, the third wiring and the connecting electrode are formed on a same layer, wherein the second wiring and the first wiring partially overlap with each other, and wherein the second wiring and the third wiring partially overlap with each other. ### Claim 2 (depends on 1) The display device according to claim 1, wherein each of the first transistor and the second transistor comprises an island-like semiconductor layer. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the first wiring and the third wiring are over the second wiring. ### Claim 4 (depends on 1) The display device according to claim 1, wherein the first transistor has a double gate structure. ### Claim 5 (depends on 1) The display device according to claim 1, wherein a second terminal of the capacitor is electrically connected to the third wiring. ### Claim 6 (depends on 1) The display device according to claim 1, further comprising a second pixel comprising a third transistor, wherein a gate of the third transistor is electrically connected to the third wiring, and wherein one of a source and a drain of the third transistor is electrically connected to the second wiring. ### Claim 7 (depends on 1) A module comprising the display device according to claim 1 and a flexible printed circuit. ### Claim 8 (depends on 1) An electronic instrument comprising the display device according to claim 1 and an antenna. ### Claim 9 (depends on 1) An electronic instrument comprising the display device according to claim 1 and a battery. ### Claim 10 A display device comprising: a first pixel comprising: a first transistor comprising a first channel formation region; a second transistor comprising a second channel formation region; a capacitor; and an electro luminescence element, wherein a gate of the first transistor is electrically connected to a first wiring, wherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a second wiring through a connecting electrode, wherein one of a source and a drain of the second transistor is electrically connected to the electro luminescence element, wherein the other of the source and the drain of the second transistor is electrically connected to a third wiring, wherein a first terminal of the capacitor is electrically connected to the gate of the second transistor, wherein the first wiring, the third wiring and the connecting electrode are formed on a same layer, wherein the second wiring and the first wiring partially overlap with each other, wherein the second wiring and the third wiring partially overlap with each other, wherein a first polycrystal silicon film over the first channel formation region functions as the gate of the first transistor, and wherein a second polycrystal silicon film over the second channel formation region functions as the gate of the second transistor. ### Claim 11 (depends on 10) The display device according to claim 10, wherein the first transistor comprises a first island-like semiconductor layer comprising the first channel formation region, and wherein the second transistor comprises a second island-like semiconductor layer comprising the second channel formation region. ### Claim 12 (depends on 10) The display device according to claim 10, wherein the first wiring and the third wiring are over the second wiring. ### Claim 13 (depends on 10) The display device according to claim 10, wherein the first transistor has a double gate structure. ### Claim 14 (depends on 10) The display device according to claim 10, wherein a second terminal of the capacitor is electrically connected to the third wiring. ### Claim 15 (depends on 10) The display device according to claim 10, further comprising a second pixel comprising a third transistor, wherein a gate of the third transistor is electrically connected to the third wiring, and wherein one of a source and a drain of the third transistor is electrically connected to the second wiring. ### Claim 16 (depends on 10) A module comprising the display device according to claim 10 and a flexible printed circuit. ### Claim 17 (depends on 10) An electronic instrument comprising the display device according to claim 10 and an antenna. ### Claim 18 (depends on 10) An electronic instrument comprising the display device according to claim 10 and a battery. ### Claim 19 A display device comprising: a first pixel comprising: a first transistor comprising a first channel formation region; a second transistor comprising a second channel formation region; a capacitor; an electro luminescence element comprising a white light emitting layer; and a color filter provided corresponding to the electro luminescence element, wherein a gate of the first transistor is electrically connected to a first wiring, wherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a second wiring through a connecting electrode, wherein one of a source and a drain of the second transistor is electrically connected to the electro luminescence element, wherein the other of the source and the drain of the second transistor is electrically connected to a third wiring, wherein a first terminal of the capacitor is electrically connected to the gate of the second transistor, wherein the first wiring, the third wiring and the connecting electrode are formed on a same layer, wherein the second wiring and the first wiring partially overlap with each other, wherein the second wiring and the third wiring partially overlap with each other, wherein a first polycrystal silicon film over the first channel formation region functions as the gate of the first transistor, wherein a second polycrystal silicon film over the second channel formation region functions as the gate of the second transistor, wherein each of the first wiring, the third wiring and the connecting electrode comprises a first conductive film comprising Ti, a second conductive film comprising Al over the first conductive film and a third conductive film comprising Ti, wherein a cathode electrode of the electro luminescence element comprises Mg and Ag, and wherein a silicon nitride film is formed over the cathode electrode of the electro luminescence element. ### Claim 20 (depends on 19) The display device according to claim 19, wherein the first transistor comprises a first island-like semiconductor layer comprising the first channel formation region, and wherein the second transistor comprises a second island-like semiconductor layer comprising the second channel formation region. ### Claim 21 (depends on 19) The display device according to claim 19, wherein the first wiring and the third wiring are over the second wiring. ### Claim 22 (depends on 19) The display device according to claim 19, wherein the first transistor has a double gate structure. ### Claim 23 (depends on 19) The display device according to claim 19, wherein a second terminal of the capacitor is electrically connected to the third wiring. ### Claim 24 (depends on 19) The display device according to claim 19, further comprising a second pixel comprising a third transistor, wherein a gate of the third transistor is electrically connected to the third wiring, and wherein one of a source and a drain of the third transistor is electrically connected to the second wiring. ### Claim 25 (depends on 19) A module comprising the display device according to claim 19 and a flexible printed circuit. ### Claim 26 (depends on 19) An electronic instrument comprising the display device according to claim 19 and an antenna. ### Claim 27 (depends on 19) An electronic instrument comprising the display device according to claim 19 and a battery.