# US 10,872,562 B2 · Pixel 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 10,872,562 B2 - Document ID: US10872562B2 - Status: Granted - Kind: B2 - Application number: 16/279,109 - Filed: 2019-02-19 - Published: 2019-08-22 - Granted: 2020-12-22 - Earliest claimed: 2018-02-19 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Ji Su Na - Web page: https://patentgrep.com/patent/US10872562B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0809: Several active elements per pixel in active matrix panels - G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2310/0297: Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0626: for control of overall brightness - 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 includes an OLED, a driving transistor, first to third transistors, and a first capacitor. The driving transistor controls an amount of current supplied from a first power source to the OLED. The first power source is coupled to a first electrode of the driving transistor. The current corresponds to a voltage of a first node. The first transistor is coupled between a data line and a second node. The first capacitor is coupled between the first node and the second node. The second transistor is coupled between the first node and a second electrode of the driving transistor. The third transistor is coupled between the first node and an initialization power source. A turn-on time of the first and second transistors overlaps that of the third transistor. ## Claims ### Claim 1 A pixel, comprising: an organic light emitting diode; a driving transistor configured to control an amount of current supplied from a first power source to the organic light emitting diode, wherein the first power source is coupled to a first electrode of the driving transistor, and the current corresponds to a voltage of a first node; a first transistor coupled between a data line and a second node, wherein the first transistor comprises a gate electrode coupled to an ith scan line, and i is a positive integer; a first capacitor coupled between the first node and the second node; a second transistor coupled between the first node and a second electrode of the driving transistor, wherein the second transistor comprises a gate electrode coupled to the ith scan line; a third transistor coupled between the first node and an initialization power source, wherein the third transistor comprises a gate electrode coupled to an ith initialization control line; and a fourth transistor coupled between the second node and the initialization power source, wherein the fourth transistor comprises a gate electrode coupled to an (i+2)th initialization control line, wherein a turn-on time of the first and second transistors overlaps a turn-on time of the third transistor. ### Claim 2 (depends on 1) The pixel of claim 1, wherein the turn-on time of the first and second transistors is longer than the turn-on time of the third transistor. ### Claim 3 (depends on 2) The pixel of claim 2, further comprising: a fifth transistor coupled between the initialization power source and the organic light emitting diode, wherein the fifth transistor comprises a gate electrode coupled to the (i+2)th initialization control line. ### Claim 4 A pixel, comprising: an organic light emitting diode; a driving transistor configured to control an amount of current supplied from a first power source to the organic light emitting diode, wherein the first power source is coupled to a first electrode of the driving transistor, and the current corresponds to a voltage of a first node; a first transistor coupled between a data line and a second node, wherein the first transistor comprises a gate electrode coupled to an ith scan line, and i is a positive integer; a first capacitor coupled between the first node and the second node; a second transistor coupled between the first node and a second electrode of the driving transistor, wherein the second transistor comprises a gate electrode coupled to the ith scan line; a third transistor coupled between the first node and an initialization power source, wherein the third transistor comprises a gate electrode coupled to an ith initialization control line; a fourth transistor coupled between the second node and the initialization power source, wherein the fourth transistor comprises a gate electrode coupled to an (i+3)th initialization control line; and a fifth transistor coupled between the initialization power source and the organic light emitting diode, wherein the fifth transistor comprises a gate electrode coupled to the (i+3)th initialization control line, wherein a turn-on time of the first and second transistors overlaps a turn-on time of the third transistor. ### Claim 5 (depends on 4) The pixel of claim 4, further comprising: a sixth transistor coupled between the organic light emitting diode and the second electrode of the driving transistor, wherein the sixth transistor comprises a gate electrode coupled to an emission control line; and a second capacitor coupled between the first node and the first power source. ### Claim 6 An organic light emitting display device, comprising: a plurality of pixels; a plurality of scan lines; a plurality of data lines; a plurality of initialization control lines, wherein the pixels are coupled to the scan lines, the data lines, and the initialization control lines; a scan driver configured to supply a scan signal to the scan lines; a data driver configured to supply a data signal to the data lines; and an initialization driver configured to supply an initialization control signal to the initialization control lines, wherein each of the pixels comprises: an organic light emitting diode; a driving transistor configured to control an amount of current supplied from a first power source to the organic light emitting diode, wherein the first power source is coupled to a first electrode of the driving transistor, and the current corresponds to a voltage of a first node; a first transistor coupled between a data line and a second node, wherein the first transistor comprises a gate electrode coupled to an ith scan line, and i is a positive integer; a first capacitor coupled between the first node and the second node; a second transistor coupled between the first node and a second electrode of the driving transistor, wherein the second transistor comprises a gate electrode coupled to the ith scan line; a third transistor coupled between the first node and an initialization power source, wherein the third transistor comprises a gate electrode coupled to an ith initialization control line; and a fourth transistor coupled between the second node and the initialization power source, wherein the fourth transistor comprises a gate electrode coupled to an (i+2)th initialization control line, wherein, during a first period of one frame, the scan signal supplied to the ith scan line and the initialization control signal supplied to the ith initialization control line overlap each other. ### Claim 7 (depends on 6) The organic light emitting display device of claim 6, wherein the one frame comprises a second period subsequent to the first period, and the scan driver supplies the scan signal to the ith scan line during the first period and the second period. ### Claim 8 (depends on 7) The organic light emitting display device of claim 7, wherein the initialization driver supplies the initialization control signal to the ith initialization control line during the first period. ### Claim 9 (depends on 8) The organic light emitting display device of claim 8, wherein the one frame further comprises a third period subsequent to the second period, and the initialization driver supplies the initialization control signal to the (i+2)th initialization control line during the third period. ### Claim 10 (depends on 8) The organic light emitting display device of claim 8, wherein the one frame further comprises a third period subsequent to the second period, and the initialization driver supplies the initialization control signal to an (i+3)th initialization control line during the third period. ### Claim 11 (depends on 10) The organic light emitting display device of claim 10, further comprising: an emission driver configured to supply an emission control signal to a plurality of emission control lines coupled to the pixels. ### Claim 12 (depends on 11) The organic light emitting display device of claim 11, wherein the one frame further comprises a fourth period subsequent to the third period, and the emission driver supplies the emission control signal to an ith emission control line during the fourth period. ### Claim 13 (depends on 6) The organic light emitting display device of claim 6, wherein each of the pixels further comprises: a fifth transistor coupled between the initialization power source and the organic light emitting diode, wherein the fifth transistor comprises a gate electrode coupled to the (i+2)th initialization control line. ### Claim 14 An organic light emitting display device, comprising: a plurality of pixels; a plurality of scan lines; a plurality of data lines; a plurality of initialization control lines, wherein the pixels are coupled to the scan lines, the data lines, and the initialization control lines; a scan driver configured to supply a scan signal to the scan lines; a data driver configured to supply a data signal to the data lines; and an initialization driver configured to supply an initialization control signal to the initialization control lines, wherein each of the pixels comprises: an organic light emitting diode; a driving transistor configured to control an amount of current supplied from a first power source to the organic light emitting diode, wherein the first power source is coupled to a first electrode of the driving transistor, and the current corresponds to a voltage of a first node; a first transistor coupled between a data line and a second node, wherein the first transistor comprises a gate electrode coupled to an ith scan line, and i is a positive integer; a first capacitor coupled between the first node and the second node; a second transistor coupled between the first node and a second electrode of the driving transistor, wherein the second transistor comprises a gate electrode coupled to the ith scan line; a third transistor coupled between the first node and an initialization power source, wherein the third transistor comprises a gate electrode coupled to an ith initialization control line; a fourth transistor coupled between the second node and the initialization power source, wherein the fourth transistor comprises a gate electrode coupled to an (i+3)th initialization control line; and a fifth transistor coupled between the initialization power source and the organic light emitting diode, wherein the fifth transistor comprises a gate electrode coupled to the (i+3)th initialization control line, wherein, during a first period of one frame, the scan signal supplied to the ith scan line and the initialization control signal supplied to the ith initialization control line overlap each other. ### Claim 15 (depends on 14) The organic light emitting display device of claim 14, wherein each of the pixels further comprises: a sixth transistor coupled between the organic light emitting diode and the second electrode of the driving transistor, wherein the sixth transistor comprises a gate electrode coupled to an emission control line; and a second capacitor coupled between the first node and the first power source. ### Claim 16 (depends on 6) The organic light emitting display device of claim 6, wherein the data driver is coupled to a plurality of output lines, and the organic light emitting display device further comprises a plurality of demultiplexers configured to selectively couple the data lines and the output lines. ### Claim 17 (depends on 16) The organic light emitting display device of claim 16, further comprising: a controller configured to control the demultiplexers such that the data signal is simultaneously supplied to two or more data lines. ### Claim 18 (depends on 17) The organic light emitting display device of claim 17, wherein each of the demultiplexers comprises a plurality of demultiplexer switches coupled between the data lines and the output lines, wherein a first group of the demultiplexer switches is turned on by a first demultiplexer control signal transmitted by the controller to couple a first output line to two or more data lines, and a second group of the demultiplexer switches is turned on by a second demultiplexer control signal transmitted by the controller to couple a second output line to two or more data lines. ### Claim 19 (depends on 18) The organic light emitting display device of claim 18, wherein the controller alternately supplies the first demultiplexer control signal and the second demultiplexer control signal during one horizontal period. ### Claim 20 (depends on 6) The organic light emitting display device of claim 6, wherein a voltage of the initialization power source is set to be lower than a voltage of the data signal.