# US 9,520,083 B2 · Organic light emitting display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,083 B2 - Document ID: US9520083B2 - Status: Granted - Kind: B2 - Application number: 14/048,866 - Filed: 2013-10-08 - Published: 2014-12-11 - Granted: 2016-12-13 - Earliest claimed: 2013-06-07 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Jin-Woo Kim - Web page: https://patentgrep.com/patent/US9520083B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - 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 2330/00: Aspects of power supply; Aspects of display protection and defect management - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - 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 An organic light emitting display includes a display panel, a power supply circuit, a voltage detection unit and a voltage compensation unit. The display panel includes a plurality of pixels. The power supply circuit outputs a first power source to the display panel. The voltage detection unit is positioned between the display panel and the power supply circuit, and detects a detection voltage data of the first power source output from the power supply circuit. The voltage compensation unit compares the detection voltage data with a previously stored reference voltage data, and controls the power supply circuit to output the first power source having a voltage level set based on the reference voltage data. ## Claims ### Claim 1 An organic light emitting display device, comprising: a display panel including a plurality of pixels; a power supply circuit configured to output a first power source to the display panel, the power supply circuit being disposed on a first board; a voltage detection unit disposed between the display panel and the power supply circuit, the voltage detection unit detecting a detection voltage data of the first power source output from the power supply circuit; a voltage compensation circuit configured to compare the detection voltage data with a previously stored reference voltage data, and control the power supply circuit to output the first power source having a voltage level set based on the reference voltage data; and a second board disposed between the display panel and the first board, the second board including the voltage detection unit and the voltage compensation circuit, wherein the voltage compensation circuit includes an electrically erasable programmable read-only memory (EEPROM) configured to store the reference voltage data therein, a micro controller unit (MCU) configured to compare the detection voltage data with the reference voltage data and calculate a compensation value set based on a result of comparing the detection voltage data with the reference voltage data, and a digital-analog converter (DAC) configured to convert the compensation value into an analog signal. ### Claim 2 (depends on 1) The organic light emitting display device of claim 1, wherein the first board is a power circuit board, and the second board is a source circuit board. ### Claim 3 (depends on 1) The organic light emitting display device of claim 1, wherein the display panel and the second board are electrically coupled to each other through a coupling member. ### Claim 4 (depends on 3) The organic light emitting display device of claim 3, wherein the coupling member includes any one of a chip on film (COF), a tape carrier package (TCP) and a flexible printed circuit board (FPCB). ### Claim 5 (depends on 1) The organic light emitting display device of claim 1, further comprising: a first power line configured to provide a conduction path for the first power source by electrically coupling the power supply circuit to the display panel; and a feedback line configured to provide a conduction path for a feedback voltage output from the voltage compensation circuit by electrically coupling the voltage compensation circuit to the power supply circuit. ### Claim 6 (depends on 5) The organic light emitting display device of claim 5, wherein the first power line is coupled in parallel to a filtering capacitor and first and second voltage dividing resistors. ### Claim 7 (depends on 5) The organic light emitting display device of claim 5, wherein the feedback line is coupled in parallel to third and fourth voltage dividing resistors. ### Claim 8 (depends on 5) The organic light emitting display device of claim 5, wherein the power supply circuit controls the first power source using the feedback voltage provided from the feedback line. ### Claim 9 (depends on 1) The organic light emitting display device of claim 1, wherein the power supply circuit is a power management IC (PMIC). ### Claim 10 (depends on 1) The organic light emitting display device of claim 1, wherein the voltage detection unit includes an analog-digital converter (ADC) configured to convert the first power source into a digital signal. ### Claim 11 (depends on 1) The organic light emitting display device of claim 1, wherein the reference voltage data is set by an operator in a factory mode. ### Claim 12 (depends on 1) The organic light emitting display device of claim 1, wherein the first power source has different voltage levels respectively corresponding to emission and non-emission periods of an emission signal supplied to the display panel, and wherein the different voltage levels are alternately applied during the emission and non-emission periods. ### Claim 13 (depends on 12) The organic light emitting display device of claim 12, wherein, in the non-emission period, the voltage compensation circuit compares the detection voltage data with a previously stored first reference voltage data, and controls the power supply circuit to output the first power source having a first voltage level according to the first reference voltage data, and wherein, in the emission period, the voltage compensation circuit compares the detection voltage data with a previously stored second reference voltage data, and controls the power supply circuit to output the first power source having a second voltage level according to the second reference voltage data.