# US 2014/0198136 A1 · Pixel circuit of an organic light emitting display device and organic light emitting display device including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0198136 A1 - Document ID: US20140198136A1 - Status: Published application - Kind: A1 - Application number: 13/963,644 - Filed: 2013-08-09 - Published: 2014-07-17 - Earliest claimed: 2013-01-16 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Chang-Ho Lee - Web page: https://patentgrep.com/patent/US20140198136A1 ## CPC - G09G 3/3266: Details of drivers for scan electrodes - 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 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 2310/0286: Details of a shift registers arranged for use in a driving circuit - 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 pixel circuit according to an embodiment includes: a capacitor; a first switching unit configured to initialize the capacitor in response to a first scan signal received from a first scan line; a second switching unit configured to receive a second scan signal from a second scan line disposed in a first direction from the first scan line, to receive a third scan signal from a third scan line disposed in a second direction opposite to the first direction from the first scan line, and to be turned on in response to one of the second scan signal and the third scan signal that is activated after the first scan signal is activated to store a data signal in the capacitor; and a driving transistor configured to provide a driving current to an OLED in response to the data signal stored in the capacitor. ## Claims ### Claim 1 A pixel circuit of an organic light emitting device, comprising: a storage capacitor; a first switching unit configured to initialize the storage capacitor in response to a first scan signal received from a first scan line; a second switching unit configured to receive a second scan signal from a second scan line disposed in a first direction from the first scan line, to receive a third scan signal from a third scan line disposed in a second direction opposite to the first direction from the first scan line, and configured to be turned on in response to one of the second scan signal and the third scan signal that is activated after the first scan signal is activated to store a data signal in the storage capacitor; a driving transistor configured to provide a driving current according to the data signal stored in the storage capacitor; and an organic light emitting diode configured to emit light in response to the driving current. ### Claim 2 (depends on 1) The pixel circuit of claim 1, wherein, when the first scan signal, the second scan signal, and the third scan signal are sequentially activated in order of the second scan signal applied through the second scan line, the first scan signal applied through the first scan line disposed in the second direction from the second scan line, and the third scan signal applied through the third scan line disposed in the second direction from the first scan line, the second switching unit is configured to turn on in response to the third scan signal to store the data signal in the storage capacitor. ### Claim 3 (depends on 1) The pixel circuit of claim 1, wherein, when the first scan signal, the second scan signal, and the third scan signal are sequentially activated in order of the third scan signal applied through the third scan line, the first scan signal applied through the first scan line disposed in the first direction from the third scan line, and the second scan signal applied through the second scan line disposed in the first direction from the first scan line, the second switching unit is configured to turn on in response to the second scan signal to store the data signal in the storage capacitor. ### Claim 4 (depends on 1) The pixel circuit of claim 1, wherein the first switching unit comprises: a first transistor configured to apply an initialization voltage to the storage capacitor in response to the first scan signal. ### Claim 5 (depends on 1) The pixel circuit of claim 1, wherein the first switching unit comprises: a plurality of first transistors connected in series, the plurality of first transistors configured to apply an initialization voltage to the storage capacitor in response to the first scan signal. ### Claim 6 (depends on 1) The pixel circuit of claim 1, wherein the second switching unit comprises: a second transistor configured to couple a data line through which the data signal is received to a first terminal of the driving transistor in response to the second scan signal; and a third transistor configured to couple the data line to the first terminal of the driving transistor in response to the third scan signal. ### Claim 7 (depends on 1) The pixel circuit of claim 1, wherein the second switching unit comprises: a plurality of second transistors connected in series, the plurality of second transistors configured to couple a data line through which the data signal is received to a first terminal of the driving transistor in response to the second scan signal; and a plurality of third transistors connected in series, the plurality of third transistors configured to couple the data line to the first terminal of the driving transistor in response to the third scan signal, wherein each of the plurality of second transistors is connected in parallel with a corresponding one of the plurality of third transistors. ### Claim 8 (depends on 1) The pixel circuit of claim 1, further comprising: a third switching unit configured to couple a second terminal of the driving transistor to the storage capacitor, wherein, when the second switching unit is turned on, the second switching unit is configured to transfer the data signal to a first terminal of the driving transistor, the driving transistor is configured to transfer the data signal from the first terminal thereof to the second terminal thereof, and the third switching unit is configured to transfer the data signal from the second terminal of the driving transistor to the storage capacitor. ### Claim 9 (depends on 8) The pixel circuit of claim 8, wherein the third switching unit comprises: a fourth transistor configured to couple the second terminal of the driving transistor to the storage capacitor in response to the second scan signal; and a fifth transistor configured to couple the second terminal of the driving transistor to the storage capacitor in response to the third scan signal. ### Claim 10 (depends on 8) The pixel circuit of claim 8, wherein the third switching unit comprises: a plurality of fourth transistors connected in series, the plurality of fourth transistors configured to couple the second terminal of the driving transistor to the storage capacitor in response to the second scan signal; and a plurality of fifth transistors connected in series, the plurality of fifth transistors configured to couple the second terminal of the driving transistor to the storage capacitor in response to the third scan signal, wherein each of the plurality of fourth transistors is connected in parallel with a corresponding one of the plurality of fifth transistors. ### Claim 11 (depends on 8) The pixel circuit of claim 8, wherein the third switching unit comprises: a diode-connected transistor coupled between the second terminal of the driving transistor and the storage capacitor. ### Claim 12 (depends on 1) The pixel circuit of claim 1, further comprising: a first emission control transistor configured to couple a power supply to the driving transistor in response to an emission control signal; and a second emission control transistor configured to couple the driving transistor to the organic light emitting diode in response to the emission control signal. ### Claim 13 (depends on 1) The pixel circuit of claim 1, wherein at least one of the driving transistor, the first switching unit, and the second switching unit comprises a PMOS transistor. ### Claim 14 (depends on 1) The pixel circuit of claim 1, wherein at least one of the driving transistor, the first switching unit, and the second switching unit comprises an NMOS transistor. ### Claim 15 A pixel circuit of an organic light emitting device, comprising: a storage capacitor comprising a first electrode coupled to a first node and a second electrode coupled to a power supply; a first transistor having a first terminal coupled to the first node, a second terminal coupled to an initialization voltage power supply, and a gate terminal coupled to a first scan line; a second transistor having a first terminal coupled to a data line, a second terminal coupled to a second node, and a gate terminal coupled to a second scan line; a third transistor having a first terminal coupled to the data line, a second terminal coupled to the second node, and a gate terminal coupled to a third scan line; a driving transistor having a first terminal coupled to the second node, a second terminal coupled to a third node, and a gate terminal coupled to the first node; a fourth transistor having a first terminal coupled to the third node, a second terminal coupled to the first node, and a gate terminal coupled to the second scan line; a fifth transistor having a first terminal coupled to the third node, a second terminal coupled to the first node, and a gate terminal coupled to the third scan line; and an organic light emitting diode configured to emit light in response to a driving current received from the driving transistor. ### Claim 16 (depends on 15) The pixel circuit of claim 15, wherein the second scan line is disposed in a first direction from the first scan line, and the third scan line is disposed in a second direction opposite to the first direction from the first scan line, wherein a first scan signal, a second scan signal, and a third scan signal are received from the first scan line, the third scan line, and the third scan line, respectively, and wherein, when the first scan signal, the second scan signal, and the third scan signal are sequentially activated in order of the second scan signal applied through the second scan line, the first scan signal applied through the first scan line disposed in the second direction from the second scan line, and the third scan signal applied through the third scan line disposed in the second direction from the first scan line, the data line is configured to be coupled to the storage capacitor through the third transistor, the driving transistor, and the fifth transistor. ### Claim 17 (depends on 15) The pixel circuit of claim 15, wherein the second scan line is disposed in a first direction from the first scan line, and the third scan line is disposed in a second direction opposite to the first direction from the first scan line, wherein a first scan signal, a second scan signal, and a third scan signal are applied through the first scan line, the second scan line, and the third scan line, respectively, and wherein, when the first scan signal, the second scan signal, and the third scan signal are sequentially activated in order of the third scan signal applied through the third scan line, the first scan signal applied through the first scan line disposed in the first direction from the third scan line, and the second scan signal applied through the second scan line disposed in the first direction from the first scan line, the data line is configured to be coupled to the storage capacitor through the second transistor, the driving transistor, and the fourth transistor. ### Claim 18 (depends on 15) The pixel circuit of claim 15, further comprising: a first emission control transistor having a first terminal coupled to the power supply, a second terminal coupled to the second node, and a gate terminal coupled to an emission control line; and a second emission control transistor having a first terminal coupled to the third node, a second terminal coupled to an anode electrode of the organic light emitting diode, and a gate terminal coupled to the emission control line. ### Claim 19 (depends on 15) The pixel circuit of claim 15, wherein at least one of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the driving transistor comprises a PMOS transistor. ### Claim 20 (depends on 15) The pixel circuit of claim 15, wherein at least one of the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the driving transistor comprises an NMOS transistor. ### Claim 21 An organic light emitting device comprising a plurality of pixel circuits, each of the plurality of pixel circuits comprising: a storage capacitor; a first switching unit configured to initialize the storage capacitor in response to a first scan signal received from a first scan line; a second switching unit configured to receive a second scan signal from a second scan line disposed in a first direction from the first scan line, to receive a third scan signal from a third scan line disposed in a second direction opposite to the first direction from the first scan line, and to be turned on in response to one of the second scan signal and the third scan signal that is activated after the first scan signal is activated to store a data signal in the storage capacitor; a driving transistor configured to provide a driving current according to the data signal stored in the storage capacitor; and an organic light emitting diode configured to emit light according to the driving current.