# US 10,319,306 B2 · Pixel, organic light emitting display device using the same, and method of driving the organic light emitting display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,306 B2 - Document ID: US10319306B2 - Status: Granted - Kind: B2 - Application number: 15/601,012 - Filed: 2017-05-22 - Published: 2017-12-21 - Granted: 2019-06-11 - Earliest claimed: 2016-06-17 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Jin Tae Jeong; Min Ku Lee; Ji Hyun Ka; Tae Hoon Kwon; Seung Kyu Lee; Seung Ji Cha - Web page: https://patentgrep.com/patent/US10319306B2 ## CPC - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 3/3225: using an active matrix - H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT] - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2310/0216: Interleaved control phases for different scan lines in the same sub-field, e.g. initialization, addressing and sustaining in plasma displays that are not simultaneous for all scan lines - 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 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels - G09G 2320/0238: Improving the black level - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - 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 A pixel includes an organic light emitting diode (OLED), a pixel circuit, and first and second transistors. The OLD includes a cathode electrode connected to a second power source. The pixel circuit includes a driving transistor having a gate electrode initialized by a third power source. The driving transistor controls the amount of current flowing from a first power source to the second power source via the OLED. The first transistor is connected between a fourth power source and the second power source and an anode electrode of the OLED. The first transistor is turned on based on a scan signal is supplied to a scan line. The second transistor is connected between a data line and the pixel circuit. The second transistor is turned on when the scan signal is supplied to the ith scan line. ## Claims ### Claim 1 A pixel, comprising: an organic light emitting diode (OLED) including a cathode electrode connected to a second power source; a pixel circuit including a driving transistor having a gate electrode to be initialized by a third power source, the driving transistor to control an amount of current that flows from a first power source to the second power source via the OLED; a first transistor connected between a fourth power source different from the third power source and the second power source and an anode electrode of the OLED, the first transistor to be turned on based on a scan signal supplied to an ith (i is a natural number) scan line; and a second transistor connected between a data line and the pixel circuit, the second transistor to be turned on when the scan signal is supplied to the ith scan line. ### Claim 2 (depends on 1) The pixel as claimed in claim 1, wherein a voltage of the third power source is greater than a voltage of the fourth power source. ### Claim 3 (depends on 1) The pixel as claimed in claim 1, wherein a voltage of the fourth power source is greater than a voltage of the second power source. ### Claim 4 (depends on 1) The pixel as claimed in claim 1, wherein a voltage of the third power source is lower than a voltage of a data signal supplied to the data line. ### Claim 5 (depends on 1) The pixel as claimed in claim 1, wherein the pixel circuit includes: at least one third transistor connected between a gate electrode of the driving transistor and the third power source, the at least one third transistor to be turned on based on a scan signal supplied to an (i−1)th scan line; at least one fourth transistor connected between the gate electrode of the driving transistor and a second electrode of the driving transistor, the at least one fourth transistor to be turned on based on the scan signal supplied to the ith scan line; a fifth transistor connected between a first electrode of the driving transistor and the first power source, the fifth transistor to have a turn-on period that does not overlap a turn-on period of the second transistor; and a sixth transistor connected between the second electrode of the driving transistor and the anode electrode of the OLED, the fifth and sixth transistors to be simultaneously turned on and turned off. ### Claim 6 (depends on 5) The pixel as claimed in claim 5, wherein the second transistor is connected to the first electrode of the driving transistor. ### Claim 7 An organic light emitting display device, comprising: a plurality of pixels connected to scan lines, data lines, and emission control lines; a scan driver to supply scan signals to the scan lines; an emission control driver to supply emission control signals to the emission control lines; and a data driver to supply data signals to the data lines, wherein each of the pixels on an ith (i is a natural number) horizontal line includes: an OLED having a cathode electrode connected to a second power source; a pixel circuit including a driving transistor to control an amount of current that flows from a first power source to the second power source via the OLED; a first transistor connected between a fourth power source different from a third power source and the second power source and an anode electrode of the OLED, the first transistor to be turned on based on a scan signal supplied to an ith scan line; a second transistor connected between a data line and the pixel circuit, the second transistor to be turned on based on the scan signal supplied to the ith scan line; and a third transistor connected between a gate electrode of the driving transistor and the third power source, the third transistor to be turned on based on a scan signal supplied to an (i−1)th scan line. ### Claim 8 (depends on 7) The organic light emitting display device as claimed in claim 7, wherein a voltage of the third power source is greater than a voltage of the fourth power source. ### Claim 9 (depends on 7) The organic light emitting display device as claimed in claim 7, wherein a voltage of the fourth power source is greater than a voltage of the second power source. ### Claim 10 (depends on 7) The organic light emitting display device as claimed in claim 7, wherein a voltage of the third power source is lower than a voltage of the data signal. ### Claim 11 (depends on 7) The organic light emitting display device as claimed in claim 7, wherein an emission control signal to be supplied to an ith emission control line overlaps the scan signals to be supplied to the (i−1)th scan line and the ith scan line. ### Claim 12 (depends on 11) The organic light emitting display device as claimed in claim 11, wherein the pixel circuit includes: at least one fourth transistor connected between the gate electrode of the driving transistor and a second electrode of the driving transistor, the at least one fourth transistor to be turned on based on the scan signal supplied to the ith scan line; a fifth transistor connected between a first electrode of the driving transistor and the first power source, the fifth transistor to be turned off based on the emission control signal supplied to the ith emission control line; and a sixth transistor connected between the second electrode of the driving transistor and the anode electrode of the OLED, the sixth transistor to be turned off based on the emission control signal supplied to the ith emission control line. ### Claim 13 (depends on 12) The organic light emitting display device as claimed in claim 12, wherein the second transistor is connected to the first electrode of the driving transistor. ### Claim 14 A method for driving an organic light emitting display device, including pixels connected to scan lines and data lines, the pixels including driving transistors to control amounts of currents supplied to organic light emitting diode (OLEDs) based on data signals, the method comprising: initializing gate electrodes of the driving transistors based on a voltage of a third power source; storing the data signals and initializing anode electrodes of the OLEDs based on a voltage of a fourth power source; and controlling amounts of currents that flow from a first power source to a second power source, via the OLEDs, based on the data signals, wherein a voltage of the fourth power source is greater than a voltage of the second power source. ### Claim 15 (depends on 14) The method as claimed in claim 14, wherein a voltage of the third power source is greater than a voltage of the fourth power source. ### Claim 16 (depends on 14) The method as claimed in claim 14, wherein a voltage of the third power source is lower than a voltage of the data signal.