# US 8,786,527 B2 · Method of driving display device, display device, and electronic appliance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,527 B2 - Document ID: US8786527B2 - Status: Granted - Kind: B2 - Application number: 12/906,539 - Filed: 2010-10-18 - Published: 2011-04-21 - Granted: 2014-07-22 - Earliest claimed: 2009-10-20 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Atsushi Umezaki; Ryo Arasawa - Inventors: Atsushi Umezaki; Ryo Arasawa - Web page: https://patentgrep.com/patent/US8786527B2 ## CPC - G09G 3/22: using controlled light sources - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - 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 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - 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 2310/0264: Details of driving circuits - G09G 2310/061: for resetting or blanking - 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) ## Abstract The present invention is a method of driving a display device including a transistor, a capacitor one electrode of which is electrically connected to a first terminal of the transistor and the other electrode of which is electrically connected to a gate of the transistor, and a display element a first electrode of which is electrically connected to a second terminal of the transistor, including the steps of: electrically connecting the gate of the transistor, the first terminal of the transistor, and both electrodes of the capacitor to a first line in a first period; electrically connecting the gate of the transistor and the other electrode of the capacitor to a second line in a second period; and electrically connecting the first terminal of the transistor and one electrode of the capacitor to a third line in a third period. ## Claims ### Claim 1 A method of driving a display device comprising a transistor, a capacitor one electrode of which is electrically connected to a first terminal of the transistor and the other electrode of which is electrically connected to a gate of the transistor, and a display element a first electrode of which is electrically connected to a second terminal of the transistor, comprising the steps of: electrically connecting the gate of the transistor, the first terminal of the transistor, and both electrodes of the capacitor to a first line in a first period; electrically connecting the gate of the transistor and the other electrode of the capacitor to a second line in a second period; and electrically connecting the first terminal of the transistor and one electrode of the capacitor to a third line through a switch in a third period, wherein the third line is electrically disconnected from the first terminal of the transistor in the first period. ### Claim 2 (depends on 1) The method of driving a display device according to claim 1, wherein the display element is an EL element. ### Claim 3 (depends on 1) The method of driving a display device according to claim 1, wherein the display element is a liquid crystal element. ### Claim 4 (depends on 1) The method of driving a display device according to claim 1, wherein the transistor is a p-channel transistor. ### Claim 5 A method of driving a display device comprising a transistor, a capacitor one electrode of which is electrically connected to a first terminal of the transistor and the other electrode of which is electrically connected to a gate of the transistor, a display element a first electrode of which is electrically connected to a second terminal of the transistor, a first switch electrically connected between the gate of the transistor and a second line, a second switch electrically connected between the gate of the transistor and the first terminal of the transistor, a third switch electrically connected to the first terminal of the transistor and a first line, and a fourth switch electrically connected to the first terminal of the transistor and a third line, comprising the steps of: bringing the first switch into an off state, the second switch into an on state, the third switch into the on state, and the fourth switch into the off state in a first period; bringing the first switch into the on state, the second switch into the off state, the third switch into the off state, and the fourth switch into the off state in a second period; and bringing the first switch into the off state, the second switch into the off state, the third switch into the off state, and the fourth switch into the on state in a third period. ### Claim 6 (depends on 5) The method of driving a display device according to claim 5, wherein the display element is an EL element. ### Claim 7 (depends on 5) The method of driving a display device according to claim 5, wherein the display element is a liquid crystal element. ### Claim 8 (depends on 5) The method of driving a display device according to claim 5, wherein the transistor is a p-channel transistor. ### Claim 9 (depends on 5) The method of driving a display device according to claim 5, wherein the first switch, the second switch, the third switch and the fourth switch are transistors. ### Claim 10 (depends on 5) The method of driving a display device according to claim 5, wherein the first switch, the second switch, the third switch and the fourth switch are diodes. ### Claim 11 A display device comprising: a transistor; a capacitor; a display element comprising a first electrode; a first switch electrically connected to a gate of the transistor and a second line; a second switch electrically connected to the gate of the transistor and a first terminal of the transistor; a third switch electrically connected to the first terminal of the transistor and a first line; and a fourth switch electrically connected to the first terminal of the transistor and a third line, wherein one electrode of the capacitor is directly connected to the first terminal of the transistor, wherein the other electrode of the capacitor is directly connected to the gate of the transistor, wherein the first electrode of the display element is directly connected to a second terminal of the transistor, and wherein the fourth switch is configured to control electrical connection between the one electrode of the capacitor and the third line and electrical connection between the first terminal of the transistor and the third line. ### Claim 12 (depends on 11) The display device according to claim 11, wherein the display element is an EL element. ### Claim 13 (depends on 11) The display device according to claim 11, wherein the display element is a liquid crystal element. ### Claim 14 (depends on 11) The display device according to claim 11, wherein the transistor is a p-channel transistor. ### Claim 15 (depends on 11) The display device according to claim 11, wherein the first electrode of the display element is larger than the one electrode of the capacitor; and wherein capacitance of the display element is larger than capacitance of the capacitor. ### Claim 16 (depends on 11) The display device according to claim 11, wherein the first switch, the second switch, the third switch and the fourth switch are transistors. ### Claim 17 (depends on 11) The display device according to claim 11, wherein the first switch, the second switch, the third switch and the fourth switch are diodes. ### Claim 18 (depends on 11) An electronic appliance comprising the display device according to claim 11.