# US 2013/0278167 A1 · Light Emitting Apparatus, Electronic Equipment and Method of Driving Pixel Circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278167 A1 - Document ID: US20130278167A1 - Status: Published application - Kind: A1 - Application number: 13/827,588 - Filed: 2013-03-14 - Published: 2013-10-24 - Earliest claimed: 2009-04-01 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Gakuji YAMAMOTO - Web page: https://patentgrep.com/patent/US20130278167A1 ## CPC - H05B 47/10: Controlling the light source - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - 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 2320/043: Preventing or counteracting the effects of ageing - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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 A light emitting apparatus includes: a first transistor having a first end a second end, and a first control electrode; a light emitting device having a first electrode and a second electrode; a second transistor having a third end connected to the first end and a fourth end connected to the first electrode; a third transistor having a fifth end connected to the first electrode and a sixth end connected to an first power supply line; a fourth transistor having a seventh end connected to the first control electrode and a eighth end connected to the first end; a capacitive device which has a third electrode connected to first control electrode and a fourth electrode; and a fifth transistor having a ninth end connected to the fourth electrode and a tenth end connected to a data line. ## Claims ### Claim 1 A light emitting apparatus comprising: a first transistor having a first end a second end, and a first control electrode; a light emitting device having a first electrode and a second electrode; a second transistor having a third end directly connected to the first end of the first transistor and a fourth end directly connected to the first electrode of the light emitting device; a third transistor having a fifth end directly connected to the first electrode of the light emitting device and a sixth end directly connected to an first power supply line; a fourth transistor having a seventh end directly connected to the first control electrode of the first transistor and a eighth end directly connected to the first end of the first transistor; a capacitive device which has a third electrode directly connected to first control electrode of the first transistor and a fourth electrode; and a fifth transistor having a ninth end directly connected to the fourth electrode of the capacitive device and a tenth end directly connected to a data line. ### Claim 2 (depends on 1) The light emitting apparatus according to claim 1, further comprising a sixth transistor having a eleventh end directly connected to the fourth electrode of the capacitive device and a twelfth end directly connected to a second power supply line. ### Claim 3 (depends on 1) The light emitting apparatus according to claim 1, further comprising a third power supply line directly connected to the second electrode of the light emitting device, a first potential being supplied to the third power supply line. ### Claim 4 (depends on 3) The light emitting apparatus according to claim 3, the first transistor being a P-channel type transistor. ### Claim 5 (depends on 4) The light emitting apparatus according to claim 4, further comprising a fourth power supply line directly connected to the second end of the first transistor, a second potential higher than the first potential being supplied to the fourth power supply line. ### Claim 6 (depends on 3) The light emitting apparatus according to claim 3, a third potential of the first power supply line being lower than a potential which is higher than the first potential by a threshold voltage of the light emitting device. ### Claim 7 (depends on 1) The light emitting apparatus according to claim 1, the second electrode of the light emitting device being directly connected to the first power supply line. ### Claim 8 (depends on 1) The light emitting apparatus according to claim 1, the fourth transistor and the fifth transistor being the same conduction type transistor. ### Claim 9 A light emitting apparatus comprising a pixel circuit and a driving circuit which drives the pixel circuit, wherein the pixel circuit includes: a first transistor having a first end a second end, and a first control electrode; a light emitting device having a first electrode and a second electrode; a second transistor having a third end directly connected to the first end of the first transistor and a fourth end directly connected to the first electrode of the light emitting device; a third transistor having a fifth end directly connected to the first electrode of the light emitting device and a sixth end directly connected to an first power supply line; a fourth transistor having a seventh end directly connected to the first control electrode of the first transistor and a eighth end directly connected to the first end of the first transistor; a capacitive device which has a third electrode directly connected to first control electrode of the first transistor and a fourth electrode; and a fifth transistor having a ninth end directly connected to the fourth electrode of the capacitive device and a tenth end directly connected to a data line. ### Claim 10 A light emitting apparatus comprising: a first transistor having a first end a second end, and a first control electrode; a light emitting device having a first electrode and a second electrode; a second transistor electrically connected between the first end of the first transistor and the first electrode of the light emitting device; a third transistor electrically connected between the first electrode of the light emitting device and an first power supply line; a fourth transistor electrically connected between the first control electrode of the first transistor and the first end of the first transistor; a capacitive device which has a third electrode connected to first control electrode of the first transistor and a fourth electrode; and a fifth transistor electrically connected between the fourth electrode of the capacitive device and a data line, the first electrode of the light emitting device being directly connected to the second transistor and the third transistor. ### Claim 11 (depends on 1) Electronic equipment including the light emitting apparatus according to claim 1. ### Claim 12 (depends on 2) Electronic equipment including the light emitting apparatus according to claim 2. ### Claim 13 (depends on 3) Electronic equipment including the light emitting apparatus according to claim 3. ### Claim 14 (depends on 4) Electronic equipment including the light emitting apparatus according to claim 4. ### Claim 15 (depends on 5) Electronic equipment including the light emitting apparatus according to claim 5. ### Claim 16 (depends on 6) Electronic equipment including the light emitting apparatus according to claim 6. ### Claim 17 (depends on 7) Electronic equipment including the light emitting apparatus according to claim 7. ### Claim 18 (depends on 8) Electronic equipment including the light emitting apparatus according to claim 8. ### Claim 19 (depends on 9) Electronic equipment including the light emitting apparatus according to claim 9. ### Claim 20 (depends on 10) Electronic equipment including the light emitting apparatus according to claim 10.