# US 12,603,048 B2 · Organic light emitting diode (OLED) display device reducing flicker by reflecting distance between display device and the user > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,048 B2 - Document ID: US12603048B2 - Status: Granted - Kind: B2 - Application number: 18/921,717 - Filed: 2024-10-21 - Published: 2025-05-08 - Granted: 2026-04-14 - Earliest claimed: 2023-11-06 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Sanghun Baek; Minki Kim - Web page: https://patentgrep.com/patent/US12603048B2 ## CPC - 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 2300/0842: 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 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2330/021: Power management, e.g. power saving - G09G 2354/00: Aspects of interface with display user - 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 may include a display panel including a plurality of subpixels, a mode control circuit configured to control a driving mode by determining a state of a user, a compensation control circuit configured to control compensation for at least one of a driving voltage and a data signal according to the user's state, a data driving circuit configured to supply a compensated data signal to the display panel according to control of the compensation control circuit, and a power management circuit configured to supply a compensated driving voltage to the display panel according to control of the compensation control circuit. ## Claims ### Claim 1 A display device, comprising: a display panel including a plurality of subpixels; a mode control circuit configured to control a driving mode by determining a state of a user; a compensation control circuit configured to output a target driving voltage corresponding to a changed driving mode at a time when the driving mode is changed or configured to output a compensated data signal with a first offset reflecting a deviation of a gate-source voltage of a driving transistor constituting the plurality of subpixels according to the user's state; a data driving circuit configured to supply the compensated data signal to the display panel according to control of the compensation control circuit; and a power management circuit configured to supply a compensated driving voltage to the display panel according to control of the compensation control circuit, wherein the compensated driving voltage is gradually changed based on a resistance component and a capacitance component between a node to which a driving voltage is applied and the display panel. ### Claim 2 (depends on 1) The display device of claim 1, wherein the mode control circuit includes: a distance sensor configured to measure a user distance from the display panel to the user; a non-use counter configured to detect a non-use time; and a mode output circuit configured to generate a mode flag indicating a driving mode according to the user distance and the non-use time. ### Claim 3 (depends on 2) The display device of claim 2, wherein the non-use counter is configured to detect the non-use time by counting an internal clock signal from a time when an input signal is finally received from an input device to a time when a next input signal is received. ### Claim 4 (depends on 1) The display device of claim 1, wherein the driving mode includes: a normal driving mode of driving the display panel at a normal driving frequency; a display-off mode of turning off a screen of the display panel by determining that the user is absent; and a low-speed driving mode of determining that the user does not generate an input signal for a predetermined time or longer to supply the data signal at a low-speed driving frequency lower than the normal driving frequency. ### Claim 5 (depends on 4) The display device of claim 4, wherein the low-speed driving mode includes a plurality of low-speed driving modes with a one-to-one correspondence to a driving frequency. ### Claim 6 (depends on 4) The display device of claim 4, wherein the low-speed driving mode includes a refresh frame in which image data is output and an anode reset frame in which image data is not output. ### Claim 7 (depends on 6) The display device of claim 6, wherein: in the refresh frame, a data voltage corresponding to the image data is transferred through a data line as the data signal; and wherein in the anode reset frame, a park voltage for preventing a voltage variation of a driving transistor constituting the plurality of subpixels is transferred through the data line as the data signal. ### Claim 8 (depends on 1) The display device of claim 1, wherein each of the plurality of subpixels includes: a light emitting element having a cathode electrode configured to receive a low-potential base voltage; the driving transistor configured to provide a driving current to the light emitting element; a first switching transistor having a gate electrode configured to receive a first scan signal, a drain electrode connected to a gate electrode of the driving transistor and a storage capacitor, and a source electrode connected to a source electrode of the driving transistor; a second switching transistor having a gate electrode configured to receive a second scan signal, a drain electrode configured to receive a data voltage, and a source electrode connected to a drain electrode of the driving transistor; a third switching transistor having a gate electrode configured to receive a light emission signal, a drain electrode configured to receive the driving voltage, and a source electrode connected to the drain electrode of the driving transistor; a fourth switching transistor having a gate electrode configured to receive the light emission signal, a drain electrode connected to the source electrode of the driving transistor, and a source electrode connected to an anode electrode of the light emitting element; a fifth switching transistor having a gate electrode configured to receive a third scan signal, a drain electrode configured to receive an initialization voltage, and a source electrode connected to the source electrode of the driving transistor; and a sixth switching transistor having a gate electrode configured to receive a fourth scan signal, a drain electrode configured to receive a reset voltage, and a source electrode connected to the anode electrode of the light emitting element. ### Claim 9 (depends on 8) The display device of claim 8, wherein the target driving voltage includes a park voltage supplied through a data line in an anode reset frame in which the initialization voltage, the reset voltage, and image data are not output. ### Claim 10 (depends on 8) The display device of claim 8, wherein the compensated data signal further includes: a second offset reflecting a deviation due to a variation in the driving voltage. ### Claim 11 (depends on 10) The display device of claim 10, wherein the second offset reflects a variation amount of the low-potential base voltage and the reset voltage. ### Claim 12 (depends on 8) The display device of claim 8, wherein the first offset reflects a variation amount of the initialization voltage. ### Claim 13 A display driving method, comprising: detecting a user's state information based on at least one of a distance to the user and a non-input time for a display; determining a driving mode according to the user's state information; calculating a time delay according to a resistance component and a capacitance component between a node to which a driving voltage is applied and a display panel; determining a target driving voltage corresponding to the driving mode; generating a data signal corresponding to the target driving voltage; and supplying a compensated driving voltage and the data signal, wherein the compensated driving voltage is gradually changed according to the time delay. ### Claim 14 A display driving method, comprising: detecting a user's state information based on at least one of a distance to the user and a non-input time for a display; determining a driving mode according to the user's state information; determining a target driving voltage corresponding to the driving mode; generating a data signal corresponding to the target driving voltage; and supplying a compensated driving voltage and the data signal, wherein the data signal includes: a first offset reflecting a deviation of a gate-source voltage of a driving transistor constituting a plurality of subpixels, or a second offset reflecting a deviation due to a variation in a driving voltage.