# US 11,908,423 B2 · 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 11,908,423 B2 - Document ID: US11908423B2 - Status: Granted - Kind: B2 - Application number: 17/864,764 - Filed: 2022-07-14 - Published: 2023-06-08 - Granted: 2024-02-20 - Earliest claimed: 2021-12-06 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Boyong Chung; Jonghee Kim; Hyuk Kim; Joosun Yoon; Tak-Young Lee - Web page: https://patentgrep.com/patent/US11908423B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - 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 - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3275: Details of drivers for data electrodes - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/0272: Details of drivers for data electrodes, the drivers communicating data to the pixels by means of a current - G09G 2310/066: Waveforms comprising a gently increasing or decreasing portion, e.g. ramp - G09G 2320/0295: by monitoring each display pixel - G09G 2330/021: Power management, e.g. power saving - G09G 2330/025: Reduction of instantaneous peaks of current - G09G 2330/026: Arrangements or methods related to booting a display - G09G 2330/027: Arrangements or methods related to powering off a display - 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 A display device includes a display panel including a plurality of pixels, a gate driver which provides a gate signal to corresponding pixels of the plurality of pixels, a data driver which provides a data voltage to the corresponding pixels of the plurality of pixels, a power voltage generator which provides a pixel power voltage to each of the plurality of pixels, and provides a gate power voltage to the gate driver, and a controller which provides a gate control signal to the gate driver. The pixel power voltage, the data voltage, and the gate control signal sequentially have a ground voltage level in response to a power-off signal. ## Claims ### Claim 1 A display device, comprising: a display panel including a plurality of pixels; a gate driver which provides a gate signal to corresponding pixels of the plurality of pixels; a data driver which provides a data voltage to the corresponding pixels of the plurality of pixels; a power voltage generator which provides a pixel power voltage to each of the plurality of pixels, and provides a gate power voltage to the gate driver; and a controller which provides a gate control signal to the gate driver, wherein the pixel power voltage, the data voltage, and the gate control signal sequentially have a ground voltage level in response to a power-off signal so that a scan clock signal, a sensing clock signal and a carry clock signal of the gate control signal only have the ground voltage level after the data voltage has the ground voltage level. ### Claim 2 (depends on 1) The display device of claim 1, wherein the pixel power voltage includes a first power voltage and a second power voltage having a voltage level lower than a voltage level of the first power voltage after a power-on, and wherein the second power voltage has the ground voltage level after the first power voltage has the ground voltage level in response to the power-off signal. ### Claim 3 (depends on 2) The display device of claim 2, wherein the first power voltage gradually decreases from a normal voltage level to the ground voltage level in response to the power-off signal. ### Claim 4 (depends on 3) The display device of claim 3, wherein the first power voltage decreases to the ground voltage level after the first power voltage decreases to a voltage level between the normal voltage level and the ground voltage level in response to the power-off signal. ### Claim 5 (depends on 1) The display device of claim 1, wherein a time interval between a time point at which the data voltage has the ground voltage level and a time point at which the gate control signal has the ground voltage level is at least one frame time. ### Claim 6 (depends on 1) The display device of claim 1, wherein the gate control signal and the gate power voltage substantially simultaneously have the ground voltage level in response to the power-off signal. ### Claim 7 (depends on 1) The display device of claim 1, wherein the gate control signal, the data voltage, and the pixel power voltage sequentially have a normal voltage level in response to a power-on signal. ### Claim 8 (depends on 7) The display device of claim 7, wherein the pixel power voltage includes a first power voltage and a second power voltage having a voltage level lower than a voltage level of the first power voltage after a power-on, and wherein the first power voltage has the normal voltage level after the second power voltage has the normal voltage level in response to the power-on signal. ### Claim 9 (depends on 8) The display device of claim 8, wherein the first power voltage gradually increases from the ground voltage level to the normal voltage level in response to the power-on signal. ### Claim 10 (depends on 9) The display device of claim 9, wherein the first power voltage increases to the normal voltage level after the first power voltage increases to a voltage level between the ground voltage level and the normal voltage level in response to the power-on signal. ### Claim 11 (depends on 1) The display device of claim 1, wherein the gate control signal and the data voltage substantially simultaneously have the ground voltage level in response to a shutdown signal. ### Claim 12 (depends on 11) The display device of claim 11, wherein the gate control signal, the data voltage, and the gate power voltage substantially simultaneously have the ground voltage level in response to the shutdown signal. ### Claim 13 (depends on 1) The display device of claim 1, wherein the gate control signal includes a plurality of clock signals and a plurality of control signals. ### Claim 14 (depends on 1) The display device of claim 1, wherein the gate power voltage includes a plurality of power voltages. ### Claim 15 A method of driving a display device, the method comprising: controlling a pixel power voltage provided to a plurality of pixels from a power voltage generator to have a ground voltage level in response to a power-off signal; controlling a data voltage provided to corresponding pixels of the plurality of pixels from a data driver to have the ground voltage level after the pixel power voltage has the ground voltage level; and controlling a scan clock signal, a sensing clock signal and a carry clock signal of a gate control signal provided to a gate driver from a controller to only have the ground voltage level after the data voltage has the ground voltage level. ### Claim 16 (depends on 15) The method of claim 15, wherein the pixel power voltage includes a first power voltage and a second power voltage having a voltage level lower than a voltage level of the first power voltage after a power-on, and wherein the controlling the pixel power voltage to have the ground voltage level includes: controlling the first power voltage to have the ground voltage level in response to the power-off signal; and controlling the second power voltage to have the ground voltage level after the first power voltage has the ground voltage level. ### Claim 17 (depends on 16) The method of claim 16, wherein the first power voltage gradually decreases from a normal voltage level to the ground voltage level in response to the power-off signal. ### Claim 18 (depends on 15) The method of claim 15, wherein a time interval between a time point at which the data voltage has the ground voltage level and a time point at which the gate control signal has the ground voltage level is at least one frame time. ### Claim 19 (depends on 15) The method of claim 15, further comprising: controlling the gate control signal to have a normal voltage level in response to a power-on signal; controlling the data voltage to have the normal voltage level after the gate control signal has the normal voltage level; and controlling the pixel power voltage to have the normal voltage level after the data voltage has the normal voltage level. ### Claim 20 (depends on 15) The method of claim 15, further comprising: controlling the gate control signal and the data voltage to substantially simultaneously have the ground voltage level in response to a shutdown signal.