# US 10,482,820 B2 · Method of compensating luminance of OLED and display system using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,482,820 B2 - Document ID: US10482820B2 - Status: Granted - Kind: B2 - Application number: 15/187,809 - Filed: 2016-06-21 - Published: 2017-12-21 - Granted: 2019-11-19 - Earliest claimed: 2016-06-21 - Assignees: Novatek Microelectronics Corp. - Applicants: NOVATEK Microelectronics Corp. - Inventors: Chun-Chieh Lin; Hua-Gang Chang; Hsueh-Yen Yang; Shang-Yu Su; Feng-Ting Pai - Web page: https://patentgrep.com/patent/US10482820B2 ## CPC - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - 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 2300/0861: 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 2310/0251: 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 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0285: using tables for spatial correction of display data - G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - G09G 2320/043: Preventing or counteracting the effects of ageing - 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 compensating luminance of an organic light-emitting diode (OLED) operated with a transistor in a pixel cell of a display panel includes measuring a first parameter of the transistor and a parameter of the OLED, and generating a lookup table accordingly; converting original display data to target display data according to the lookup table; outputting the target display data to the pixel cell; and compensating a second parameter of the transistor when the target display data is received by the pixel cell. ## Claims ### Claim 1 A method of compensating luminance of an organic light-emitting diode (OLED) operated with a transistor in a pixel cell of a display panel, comprising: measuring an electronic mobility and an oxide capacitance of the transistor and a luminous efficiency of the OLED, and generating a first lookup table comprising information for compensating the electronic mobility and the oxide capacitance of the transistor without compensating a threshold voltage of the transistor and a second lookup table comprising information for compensating the luminous efficiency of the OLED; converting original display data to target display data according to the first lookup table and the second lookup table; outputting the target display data to the pixel cell; and compensating the threshold voltage of the transistor when the target display data is received by the pixel cell; wherein the compensation of threshold voltage is an internal compensation performed by the pixel cell. ### Claim 2 (depends on 1) The method of claim 1, wherein the step of converting original display data to target display data according to the first lookup table and the second lookup table comprises: performing a transistor compensation to allow a voltage mismatch existing between a voltage value of the transistor and a target voltage value, wherein the voltage mismatch is within a specific range that is able to be dealt with by compensating the threshold voltage. ### Claim 3 (depends on 1) The method of claim 1, wherein the first lookup table and the second lookup table indicate a compensation value for converting the original display data to the target display data. ### Claim 4 A display system, comprising: a display panel, comprising a plurality of pixel cells, each of which comprising an organic light-emitting diode (OLED) operated with a transistor; an external compensation module, for measuring an electronic mobility and an oxide capacitance of the transistor and a luminous efficiency of the OLED, and generating a first lookup table comprising information for compensating the electronic mobility and the oxide capacitance of the transistor and a second lookup table comprising information for compensating the luminous efficiency of the OLED; and a controller, for converting original display data to target display data according to the first lookup table and the second lookup table, and outputting the target display data to one of the plurality of pixel cells; wherein the threshold voltage of the transistor is compensated when the target display data is received by the pixel cell; wherein the compensation of the threshold voltage is an internal compensation performed by the pixel cell. ### Claim 5 (depends on 4) The display system of claim 4, wherein the controller performs a transistor compensation to allow a voltage mismatch existing between a voltage value of the transistor and a target voltage value, wherein the voltage mismatch is within a specific range that is able to be dealt with by compensating the threshold voltage. ### Claim 6 (depends on 4) The display system of claim 4, wherein the first lookup table and the second lookup table indicate a compensation value for converting the original display data to the target display data.