# US 2014/0192103 A1 · Method of controlling a dimming operation and organic light emitting display device performing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192103 A1 - Document ID: US20140192103A1 - Status: Published application - Kind: A1 - Application number: 14/107,521 - Filed: 2013-12-16 - Published: 2014-07-10 - Earliest claimed: 2013-01-09 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Sang-Kwon Ha - Web page: https://patentgrep.com/patent/US20140192103A1 ## CPC - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant} - G09G 3/2022: {using sub-frames} - G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)} - G09G 2300/0809: Several active elements per pixel in active matrix panels - 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 2320/045: 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) ## Abstract A method of controlling a dimming operation of an organic light emitting display device that includes an organic light emitting element, a first transistor connected to a data line and a gate line, and a second transistor connected to the first transistor and the organic light emitting element, is provided. By the method, image data is compensated using a plurality of look-up tables respectively corresponding to a plurality of dimming modes, to be outputted compensation data. The compensation data are converted to a data voltage to be provided the organic light emitting element with the data voltage. A level of a current applied to the organic light emitting element is adjusted according to the dimming. ## Claims ### Claim 1 A method of controlling a dimming operation of an organic light emitting display device that includes an organic light emitting element, a first transistor connected to a data line and a gate line, and a second transistor connected to the first transistor and the organic light emitting element, the method comprising: compensating image data using a plurality of look-up tables respectively corresponding to a plurality of dimming modes, to output compensation data corresponding to the image data; converting the compensation data to a data voltage to provide the organic light emitting element with the data voltage; and adjusting a level of a current applied to the organic light emitting element according to each of the dimming modes. ### Claim 2 (depends on 1) The method of claim 1, wherein the adjusting the level of the current comprising: providing a third transistor with a current-control voltage having a voltage difference with respect to a first source voltage, the voltage difference being different according to the dimming mode, the third transistor including an input electrode receiving the first source voltage, a control electrode receiving the current-control voltage and an output electrode connected to the second transistor. ### Claim 3 (depends on 2) The method of claim 2, wherein the compensation data stored in the plurality of look-up tables are determined based on a plurality of reference points predetermined on a voltage-current curve of the third transistor. ### Claim 4 A method of controlling a dimming operation of an organic light emitting display device that includes an organic light emitting element, a first transistor connected to a data line and a gate line, a second transistor connected to the first transistor and the organic light emitting element, the method comprising: compensating image data using a look-up table to output compensation data; and adjusting a pulse width of a scan signal applied to the gate line according to on each of a plurality of dimming modes. ### Claim 5 (depends on 4) The method of claim 4, wherein the adjusting the pulse width comprising: adjusting the pulse width of the scan signal to a first pulse width in a high dimming mode; and adjusting the pulse width of the scan signal to a second pulse width less than the first pulse width in a low dimming mode. ### Claim 6 (depends on 4) The method of claim 4, further comprising: providing the organic light emitting element with a current of a level fixed without reference to the dimming mode. ### Claim 7 (depends on 4) The method of claim 4, wherein the adjusting the pulse width comprising: providing a third transistor with a current-control voltage having a voltage difference with respect to a first source voltage without reference to the dimming mode, the third transistor including an input electrode receiving the first source voltage, a control electrode receiving the current-control voltage and an output electrode connected to the second transistor. ### Claim 8 (depends on 4) The method of claim 4, wherein the compensation data stored in the look-up table are determined based on a single reference point preset on a voltage-current curve of the third transistor. ### Claim 9 An organic light emitting display device comprising: a display panel including a plurality of sub-pixels, and each of the sub-pixels comprising an organic light emitting element, a first transistor connected a data line and a gate line, a second transistor connected to the first transistor and the organic light emitting element, and a third transistor connected to the second transistor and adjusting a level of a current applied to the organic light emitting element; a data compensating part compensating image data using a plurality of look-up tables respectively corresponding to a plurality of dimming modes, to output compensation data; a data driving part converting the compensation data to a data voltage to provide the data line with the data voltage; and a scan driving part generating a scan signal to provide the gate line with the scan signal. ### Claim 10 (depends on 9) The organic light emitting display device of claim 9, further comprising: a current-control voltage generating part providing the third transistor with a current-control voltage having a voltage difference with respect to a first source voltage, the voltage difference being different according to the dimming mode, the third transistor including an input electrode receiving the first source voltage, a control electrode receiving the current-control voltage and an output electrode connected to the second transistor. ### Claim 11 (depends on 9) The organic light emitting display device of claim 9, wherein the compensation data stored in the plurality of look-up tables are determined based on a plurality of reference points predetermined on a voltage-current curve of the third transistor. ### Claim 12 An organic light emitting display device comprising: a display panel including a plurality of sub-pixels, and each of the sub-pixels comprising an organic light emitting element, a first transistor connected a data line and a gate line, a second transistor connected to the first transistor and the organic light emitting element, and a third transistor connected to the second transistor and adjusting a level of a current applied to the organic light emitting element; a data compensating part compensating image data using a look-up table to output compensation data; a data driving part converting the compensation data to a data voltage to provide the data line with the data voltage; and a scan driving part generating a scan signal to provide the scan signal with the gate line, the scan signal having a different pulse width according to the dimming mode. ### Claim 13 (depends on 12) The organic light emitting display device of claim 12, further comprising: a timing control part adjusting the pulse width of the scan signal according to the dimming mode. ### Claim 14 (depends on 13) The organic light emitting display device of claim 13, wherein the scan driving part generates the scan signal having a first pulse width in a high dimming mode and generates the scan signal having a second pulse width less than the first pulse width in a low dimming mode. ### Claim 15 (depends on 12) The organic light emitting display device of claim 12, further comprising: a current-control voltage generating part providing the third transistor with a current-control voltage, wherein the current-control voltage generating part provides the organic light emitting element with the current-control voltage of a predetermined level fixed without reference to the dimming mode. ### Claim 16 (depends on 15) The organic light emitting display device of claim 15, wherein the third transistor includes an input electrode receiving a first source voltage, a control electrode receiving the current-control voltage and an output electrode connected to the second transistor, and the current-control voltage generating part provides the third transistor with the current-control voltage having a voltage difference with respect to the first source voltage without reference to the dimming mode. ### Claim 17 (depends on 12) The organic light emitting display device of claim 12, wherein the compensation data stored in the look-up table are determined based on a single reference point predetermined on a voltage-current curve of the third transistor.