# US 10,373,553 B2 · Organic light emitting diode display device and method of driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,373,553 B2 - Document ID: US10373553B2 - Status: Granted - Kind: B2 - Application number: 15/821,521 - Filed: 2017-11-22 - Published: 2018-05-24 - Granted: 2019-08-06 - Earliest claimed: 2016-11-23 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Jeonghwan Shin - Web page: https://patentgrep.com/patent/US10373553B2 ## CPC - G09G 3/3225: using an active matrix - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3275: Details of drivers for data electrodes - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with 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 2310/0262: 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 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - 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 2330/021: Power management, e.g. power saving - 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 diode display device including a display panel including a pixel, a power supply configured to apply a voltage to the pixel, and a current measurement circuit connected to the pixel, wherein the pixel includes a pixel circuit and an organic light emitting diode, the pixel circuit including a plurality of switching elements and one or more capacitors, and wherein the current measurement circuit includes a current integration circuit including an amplifier, the amplifier including a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to the pixel circuit, a threshold voltage compensation circuit connected to the second input terminal of the amplifier, and an analog-to-digital converter connected to the output terminal of the amplifier. ## Claims ### Claim 1 An organic light emitting diode display device comprising: a display panel comprising a pixel; a power supply configured to apply a voltage to the pixel; and a current measurement circuit connected to the pixel, wherein the pixel comprises a pixel circuit and an organic light emitting diode, the pixel circuit comprising a plurality of switching elements and one or more capacitors, and wherein the current measurement circuit comprises: a current integration circuit comprising an amplifier, the amplifier comprising a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to the pixel circuit; a threshold voltage compensation circuit connected to the second input terminal of the amplifier, and configured to selectively apply a reference voltage and a sum of the reference voltage and a threshold voltage of the organic light emitting diode to the second input terminal of the amplifier; an analog-to-digital converter connected to the output terminal of the amplifier; and wherein a current corresponding to the sum of the reference voltage and the threshold voltage is applied to the current integration circuit and the organic light emitting diode. ### Claim 2 (depends on 1) The organic light emitting diode display device of claim 1, wherein the threshold voltage compensation circuit comprises a plurality of switches and a threshold voltage storage capacitor. ### Claim 3 (depends on 2) The organic light emitting diode display device of claim 2, wherein the power supply is configured to supply the reference voltage, and the threshold voltage compensation circuit is connected to the power supply. ### Claim 4 (depends on 3) The organic light emitting diode display device of claim 3, wherein the threshold voltage compensation circuit is connected to a ground potential source. ### Claim 5 (depends on 1) The organic light emitting diode display device of claim 1, wherein the current integration circuit further comprises: a feedback capacitor connected to the first input terminal and the output terminal of the amplifier; and a feedback switch connected in parallel with the feedback capacitor between the first input terminal and the output terminal of the amplifier. ### Claim 6 (depends on 5) The organic light emitting diode display device of claim 5, wherein the analog-to-digital converter is connected to the feedback capacitor and the feedback switch of the current integration circuit. ### Claim 7 An organic light emitting diode display device comprising: a display panel comprising a pixel; a power supply configured to apply a voltage to the pixel; and a current measurement circuit connected to the pixel, wherein the pixel comprises a pixel circuit and an organic light emitting diode, the pixel circuit comprising a plurality of switching elements and one or more capacitors, and wherein the current measurement circuit comprises: a current integration circuit comprising an amplifier, the amplifier comprising a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to the pixel circuit; a threshold voltage compensation circuit connected to the second input terminal of the amplifier; and an analog-to-digital converter connected to the output terminal of the amplifier, wherein the threshold voltage compensation circuit comprises a plurality of switches and a threshold voltage storage capacitor, wherein the plurality of switches of the threshold voltage compensation circuit comprise a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch, wherein one end of the second switch is connected to the organic light emitting diode and another end of the second switch is connected to the third switch, the threshold voltage storage capacitor, and the fifth switch, wherein one end of the third switch is connected to the second switch, the threshold voltage storage capacitor, and the fifth switch, and another end of the third switch is connected to the current integration circuit, wherein one end of the fourth switch is connected to the threshold voltage storage capacitor, the fifth switch, and the sixth switch, and another end of the fourth switch is connected to a ground potential source, wherein one end of the fifth switch is connected to the second switch, the third switch, and the threshold voltage storage capacitor, and another end of the fifth switch is connected to the fourth switch and the sixth switch, wherein one end of the sixth switch is connected to the fourth switch and the fifth switch, and another end of the sixth switch is connected to the power supply, and wherein one end of the threshold voltage storage capacitor is connected to the second switch, the third switch, and the fifth switch, and another end of the threshold voltage storage capacitor is connected to the fourth switch, the fifth switch, and the sixth switch. ### Claim 8 A method of driving an organic light emitting diode display device, the method comprising: initializing a threshold voltage compensation circuit and a current integration circuit connected to the threshold voltage compensation circuit; storing a threshold voltage of an organic light emitting diode in the threshold voltage compensation circuit; and measuring a driving current of the organic light emitting diode by compensating a reference voltage with the stored threshold voltage of the organic light emitting diode, wherein the measuring of the driving current of the organic light emitting diode comprises: applying a sum of the reference voltage and the stored threshold voltage to the threshold voltage compensation circuit and the organic light emitting diode. ### Claim 9 (depends on 8) The method of claim 8, wherein the initializing the threshold voltage compensation circuit comprises applying the reference voltage to the threshold voltage compensation circuit. ### Claim 10 (depends on 8) The method of claim 8, wherein the threshold voltage compensation circuit comprises a threshold voltage storage capacitor. ### Claim 11 (depends on 10) The method of claim 10, wherein the storing the threshold voltage of the organic light emitting diode in the threshold voltage compensation circuit comprises applying a threshold voltage of the organic light emitting diode to the threshold voltage storage capacitor of the threshold voltage compensation circuit. ### Claim 12 (depends on 8) The method of claim 8, wherein the reference voltage has a value greater than a value of the threshold voltage. ### Claim 13 A method of driving an organic light emitting diode display device, the method comprising: initializing a threshold voltage compensation circuit and a current integration circuit connected to the threshold voltage compensation circuit; storing a threshold voltage of an organic light emitting diode in the threshold voltage compensation circuit; and measuring a driving current of the organic light emitting diode by compensating a reference voltage with the stored threshold voltage of the organic light emitting diode, wherein the measuring the driving current of the organic light emitting diode comprises: applying a sum of the reference voltage and the stored threshold voltage to the threshold voltage compensation circuit and the organic light emitting diode; and applying a current corresponding to the sum of the reference voltage and the stored threshold voltage through the current integration circuit and the organic light emitting diode.