# US 10,121,414 B2 · Pixel having plurality of storage capacitors, display device including the pixel, and driving method of the display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,121,414 B2 - Document ID: US10121414B2 - Status: Granted - Kind: B2 - Application number: 14/869,863 - Filed: 2015-09-29 - Published: 2016-01-21 - Granted: 2018-11-06 - Earliest claimed: 2011-05-19 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Sang-Myeon Han - Web page: https://patentgrep.com/patent/US10121414B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/003: {to produce spatial visual effects} - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements - H04N 13/341: using temporal multiplexing - 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 2300/0852: being a dynamic memory with more than 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 2310/0205: Simultaneous scanning of several lines in flat panels - G09G 2320/0252: Improving the response speed - G09G 2320/0261: in the context of movement of objects on the screen or movement of the observer relative to the screen - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A display device that includes a pixel including an organic light emitting diode (OLED), a driving transistor connected to the driving voltage and supplying a driving current to the OLED, a compensation capacitor connected to the gate electrode of the driving transistor, and a first storage capacitor and a second storage capacitor electrically connected to or blocked from the compensation capacitor, and a driving method thereof. ## Claims ### Claim 1 A driving method of a display device including a plurality of pixels, each including an organic light emitting diode (OLED), a driving transistor connected to a driving voltage and supplying a driving current to the OLED, a compensation capacitor connected to a gate electrode of the driving transistor, a first storage capacitor, and a second storage capacitor, wherein the compensation capacitor includes one electrode directly connected to the gate electrode of the driving transistor and another electrode directly connected to a first operation control transistor and electrically connected to or disconnected from the first storage capacitor through the first operation control transistor, the method comprising: a reset step in which an anode voltage of the OLED is discharged; a compensation step in which a threshold voltage of the driving transistor is stored to the compensation capacitor; a scan step in which a data voltage is stored to the first storage capacitor according to a corresponding data signal; and a light emitting step in which the OLED emits light according to the driving current flowing to the driving transistor by a data voltage stored to the second storage capacitor, wherein the light emitting steps of the plurality of pixels are concurrently generated, and the scan step and the light emitting step are temporally overlapped, and wherein a voltage supplied to the first storage capacitor in the scan step is different from a voltage supplied to the driving transistor in the light emitting step. ### Claim 2 (depends on 1) The driving method of claim 1, wherein the scan step includes a step in which the connection of the first storage capacitor and the compensation capacitor is blocked, and the first storage capacitor is transmitted with the corresponding data signal. ### Claim 3 (depends on 1) The driving method of claim 1, wherein the light emitting step includes a step in which the second storage capacitor and the compensation capacitor are connected, and the voltage of the gate electrode of the driving transistor is changed by the data voltage stored in the second storage capacitor. ### Claim 4 (depends on 1) The driving method of claim 1, wherein the reset step includes a step in which the driving transistor is turned on such that an anode of the OLED is connected to the driving voltage, and a different driving voltage input to a cathode of the OLED is higher than the driving voltage. ### Claim 5 (depends on 1) The driving method of claim 1, wherein the compensation step includes a step in which the first storage capacitor is connected to the compensation capacitor, a set voltage is input to a node to which the first storage capacitor and the compensation capacitor are connected, and the driving transistor is diode-connected. ### Claim 6 (depends on 1) The driving method of claim 1, wherein the reset step includes a step in which the first storage capacitor and the compensation capacitor are connected, a set reference voltage is transmitted to a node at which the first storage capacitor and the compensation capacitor are connected, and the voltage of the gate electrode of the driving transistor is initialized by the reference voltage. ### Claim 7 (depends on 1) The driving method of claim 1, wherein the display device further includes another driving voltage connected to a cathode of the OLED, and a voltage level of the another driving voltage during the reset step and the compensation step is different than that during the light emitting step. ### Claim 8 A driving method of a display device including a plurality of pixels, each including a driving transistor, a first storage capacitor, and a second storage capacitor, and a compensation capacitor, the compensation capacitor including one electrode directly connected to a gate electrode of the driving transistor and another electrode directly connected to a first operation control transistor and a second operation control transistor and electrically connected to one of the first and second storage capacitors through the first operation control transistor and the second operation control transistor, the method comprising: programming first frame data to the first storage capacitor of each of the plurality of pixels during a first scan period; programming second frame data to the second storage capacitor of each of the plurality of pixels during a second scan period; and emitting light through the plurality of pixels by a driving current flowing in the driving transistor of each of the plurality of pixels according to the first frame data programmed to the first storage capacitor during a first light emitting period, wherein the second scan period and the first light emitting period are temporally overlapped, and wherein a voltage supplied to the first storage capacitor in the first scan period is different from a voltage supplied to the driving transistor in the first light emitting step. ### Claim 9 (depends on 8) The driving method of claim 8, further comprising programming third frame data preceding the first frame data to the second storage capacitor of each of the plurality of pixels; and emitting light through the plurality of pixels by a driving current flowing in the driving transistor of each of the plurality of pixels according to the third frame data programmed to the second storage capacitor of each of the plurality of pixels during a second light emitting period, and the second light emitting period and the first scan period are temporally overlapped. ### Claim 10 (depends on 8) The driving method of claim 8, wherein the first frame data is first view point data, and the second frame data is second view point data different from the first view point data. ### Claim 11 A pixel comprising: an organic light emitting diode (OLED); a driving transistor configured to be electrically connected to a first driving voltage and to supply a driving current to the OLED; a compensation capacitor configured to store a threshold voltage of the driving transistor; a first operation control transistor including one electrode directly connected to another electrode of the compensation capacitor and configured to be controlled by a first operation control signal; a second operation control transistor including one electrode directly connected to the other electrode of the compensation capacitor and configured to be controlled by a second operation control signal; a first storage capacitor including one electrode connected to another electrode of the first operation control transistor and another electrode connected to a set reference voltage different from the first driving voltage; and a second storage capacitor including one electrode connected to another electrode of the second operation control transistor and another electrode connected to the reference voltage, wherein the compensation capacitor includes one electrode directly connected to a gate electrode of the driving transistor and another electrode selectively connected to the first and second storage capacitors, and wherein the second operation control transistor is configured such that when it is turned on, the second storage capacitor and the compensation capacitor are connected during a period in which the first operation control transistor is turned off such that a data voltage is stored to the first storage capacitor according to a corresponding data signal. ### Claim 12 (depends on 11) The pixel of claim 11, further comprising: a first switching transistor including one electrode connected to the one electrode of the first storage capacitor, and another electrode configured to be input with the corresponding data signal and to be controlled by a first scan signal; and a second switching transistor including one electrode connected to the one electrode of the second storage capacitor, and another electrode configured to be input with the corresponding data signal and to be controlled by a second scan signal. ### Claim 13 (depends on 12) The pixel of claim 12, further comprising a compensation transistor connected between the gate electrode and a drain electrode of the driving transistor. ### Claim 14 (depends on 13) The pixel of claim 13, wherein the first switching transistor is configured to be turned on and the compensation transistor is configured to be turned on during a compensation period. ### Claim 15 (depends on 11) The pixel of claim 11, wherein the pixel further includes a source of a fourth driving voltage applied to a cathode of the organic light emitting diode (OLED), and the driving transistor is turned on during a reset period and the first driving voltage has a lower level than the fourth driving voltage. ### Claim 16 A display device comprising: a plurality of data lines for transmitting a plurality of data signals; a plurality of first scan lines for transmitting a plurality of first scan signals; a plurality of second scan lines for transmitting a plurality of second scan signals; a first operation control line and a second operation control line for transmitting a first operation control signal and a second operation control signal; a first voltage line for transmitting a first driving voltage and a second voltage line for transmitting a second driving voltage; and a plurality of pixels each connected to a corresponding data line of the data lines, a corresponding first scan line of the first scan lines, a corresponding second scan line of the second scan lines, the first operation control line, the second operation control line, the first voltage line, and the second voltage line, wherein each of the pixels includes: an organic light emitting diode (OLED) including a cathode connected to the second voltage line; a driving transistor connected to the first voltage line for supplying a driving current to the OLED; a compensation capacitor connected to a gate electrode of the driving transistor; and a first storage capacitor and a second storage capacitor connected between the compensation capacitor and a source of the first driving voltage, and wherein the display device is configured to provide: a first period in which the first storage capacitor is connected to the corresponding data line according to both a first scan signal of the first scan signals transmitted through the corresponding first scan line and the first operation control signal transmitted through the first operation control line, and the compensation capacitor is blocked; and a second period temporally overlapped with the first period and in which the second storage capacitor is blocked from the corresponding data line and is connected to the compensation capacitor according to both a second scan signal of the second scan signals transmitted through the corresponding second scan line and the second operation control signal transmitted through the second operation control line, and wherein a voltage supplied to the first storage capacitor in the first period is different from a voltage supplied to the driving transistor in the second period. ### Claim 17 (depends on 16) The display device of claim 16, wherein the display device further includes a compensation control line for transmitting a compensation signal, and each of the pixels further includes a compensation transistor connected between the gate electrode and a drain electrode of the driving transistor and operated according to the compensation signal. ### Claim 18 (depends on 17) The display device of claim 17, wherein during a reset period in which the compensation transistor is turned on and the first driving voltage transmitted through the first voltage line is at a first level, the display device is configured to provide the second driving voltage with a voltage level transmitted through the second voltage line that is different from the level of the second driving voltage during the first period and the second period. ### Claim 19 (depends on 18) The display device of claim 18, wherein the first driving voltage is at a second level different from the first level during the first period and the second period.