# US 12,603,055 B2 · Display device including a sweep driver that provides a sweep signal, and electronic device including the display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,055 B2 - Document ID: US12603055B2 - Status: Granted - Kind: B2 - Application number: 19/025,374 - Filed: 2025-01-16 - Published: 2025-10-30 - Granted: 2026-04-14 - Earliest claimed: 2024-04-25 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Sehyun Lee; Dongwoo Kim; Junghwan Hwang; Kwihyun Kim - Web page: https://patentgrep.com/patent/US12603055B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant} - G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)} - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0852: being a dynamic memory with more than 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 2310/066: Waveforms comprising a gently increasing or decreasing portion, e.g. ramp - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - G09G 2320/064: by time modulation of the brightness of the illumination source - 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 Provided is a display device including a display panel including a plurality of pixels, a data driver which provides a data voltage to each of the plurality of pixels, a scan driver which provides a scan signal to each of the plurality of pixels, a sweep driver which provides a sweep signal to each of the plurality of pixels, and a controller. Each pixel includes a light emitting element, a pulse width modulation circuit which receives the data voltage in response to the scan signal, and generates a pulse width modulation signal based on the data voltage and the sweep signal, and a current generation circuit which provides a current to the light emitting element based on the pulse width modulation signal. A slope of the sweep signal is changed in a plurality of modes having different maximum luminances. ## Claims ### Claim 1 A display device comprising: a display panel including a plurality of pixels; a data driver which provides a data voltage to each of the plurality of pixels; a scan driver which provides a scan signal to each of the plurality of pixels; a sweep driver which provides a sweep signal to each of the plurality of pixels; and a controller which controls the data driver, the scan driver and the sweep driver, wherein each of the plurality of pixels includes: a light emitting element; a pulse width modulation circuit which receives the data voltage in response to the scan signal and generates a pulse width modulation signal based on the data voltage and the sweep signal; and a current generation circuit which provides a current to the light emitting element based on the pulse width modulation signal, and a slope of the sweep signal is changed in a plurality of modes having different maximum luminances. ### Claim 2 (depends on 1) The display device of claim 1, wherein the plurality of modes includes a first mode having a first maximum luminance, and a second mode having a second maximum luminance lower than the first maximum luminance, and the sweep signal has a first slope in the first mode and has a second slope having an absolute value greater than an absolute value of the first slope in the second mode. ### Claim 3 (depends on 1) The display device of claim 1, wherein the sweep signal gradually changes in a sweep period in each frame period, and the sweep period includes different time lengths in the plurality of modes. ### Claim 4 (depends on 3) The display device of claim 3, wherein the plurality of modes includes a first mode having a first maximum luminance, and a second mode having a second maximum luminance lower than the first maximum luminance, and the sweep period has a first time length in the first mode and has a second time length shorter than the first time length in the second mode. ### Claim 5 (depends on 4) The display device of claim 4, wherein, in the first mode, the sweep signal gradually changes from a first voltage level to a second voltage level during the sweep period having the first time length, and in the second mode, the sweep signal gradually changes from the first voltage level to the second voltage level during the sweep period having the second time length. ### Claim 6 (depends on 1) The display device of claim 1, wherein the sweep driver generates the sweep signal based on a sweep clock signal, and the sweep clock signal has different clock periods in the plurality of modes. ### Claim 7 (depends on 6) The display device of claim 6, wherein the plurality of modes includes a first mode having a first maximum luminance, and a second mode having a second maximum luminance lower than the first maximum luminance, and the sweep clock signal has a first clock period in the first mode, and has a second clock period shorter than the first clock period in the second mode. ### Claim 8 (depends on 1) The display device of claim 1, wherein the plurality of modes includes: a high brightness mode (HBM) having a first maximum luminance; a normal mode having a second maximum luminance lower than the first maximum luminance; and an always on display (AOD) mode having a third maximum luminance lower than the second maximum luminance. ### Claim 9 (depends on 1) The display device of claim 1, wherein the plurality of pixels includes a red pixel, a green pixel, and a blue pixel, and a first sweep signal applied to the red pixel, a second sweep signal applied to the green pixel and a third sweep signal applied to the blue pixel have different slopes. ### Claim 10 (depends on 9) The display device of claim 9, wherein an absolute value of a slope of the second sweep signal is greater than an absolute value of a slope of the third sweep signal, and an absolute value of a slope of the first sweep signal is greater than the absolute value of the slope of the second sweep signal. ### Claim 11 A display device comprising: a display panel including a red pixel, a green pixel, and a blue pixel; a data driver which provides a data voltage to each of the red pixel, the green pixel and the blue pixel; a scan driver which provides a scan signal to each of the red pixel, the green pixel and the blue pixel; a sweep driver which provides a first sweep signal to the red pixel, provides a second sweep signal to the green pixel and provides a third sweep signal to the blue pixel; and a controller which controls the data driver, the scan driver, and the sweep driver, wherein each of the red pixel, the green pixel, and the blue pixel includes: a light emitting element; a pulse width modulation circuit which receives the data voltage in response to the scan signal and generates a pulse width modulation signal based on the data voltage and a corresponding one of the first, second, and third sweep signals; and a current generation circuit which provides a current to the light emitting element based on the pulse width modulation signal, and the first sweep signal, the second sweep signal, and the third sweep signal include different slopes. ### Claim 12 (depends on 11) The display device of claim 11, wherein an absolute value of a slope of the second sweep signal is greater than an absolute value of a slope of the third sweep signal, and an absolute value of a slope of the first sweep signal is greater than the absolute value of the slope of the second sweep signal. ### Claim 13 (depends on 11) The display device of claim 11, wherein a first sweep period in which the first sweep signal gradually changes, a second sweep period in which the second sweep signal gradually changes, and a third sweep period in which the third sweep signal gradually changes include different time lengths. ### Claim 14 (depends on 13) The display device of claim 13, wherein a time length of the second sweep period is shorter than a time length of the third sweep period, and a time length of the first sweep period is shorter than the time length of the second sweep period. ### Claim 15 (depends on 13) The display device of claim 13, wherein the third sweep signal gradually changes from a first voltage level to a second voltage level during the third sweep period, the second sweep signal gradually changes from the first voltage level to the second voltage level during the second sweep period having a time length shorter than a time length of the third sweep period, and the first sweep signal gradually changes from the first voltage level to the second voltage level during the first sweep period having a time length shorter than the time length of the second sweep period. ### Claim 16 (depends on 11) The display device of claim 11, wherein the sweep driver generates the first sweep signal based on a first sweep clock signal, generates the second sweep signal based on a second sweep clock signal, and generates the third sweep signal based on a third sweep clock signal, and the first sweep clock signal, the second sweep clock signal, and the third sweep clock signal have different clock periods. ### Claim 17 (depends on 16) The display device of claim 16, wherein a clock period of the second sweep clock signal is shorter than a clock period of the third sweep clock signal, and a clock period of the first sweep clock signal is shorter than the clock period of the second sweep clock signal. ### Claim 18 (depends on 11) The display device of claim 11, wherein a slope of each of the first sweep signal, the second sweep signal, and the third sweep signal is changed in a plurality of modes having different maximum luminances. ### Claim 19 (depends on 18) The display device of claim 18, wherein the plurality of modes includes a first mode having a first maximum luminance, and a second mode having a second maximum luminance lower than the first maximum luminance, and each of the first sweep signal, the second sweep signal, and the third sweep signal has a first slope in the first mode, and has a second slope having an absolute value greater than an absolute value of the first slope in the second mode. ### Claim 20 An electronic device comprising: a processor configured to provide input image data; and a display device configured to receive the input image data from the processor, and to display an image based on the input image data, the display device comprising: a display panel including a red pixel, a green pixel, and a blue pixel; a data driver which provides a data voltage to each of the red pixel, the green pixel, and the blue pixel; a scan driver which provides a scan signal to each of the red pixel, the green pixel, and the blue pixel; a sweep driver which provides a first sweep signal having a first slope to the red pixel, provides a second sweep signal having a second slope different from the first slope to the green pixel, and provides a third sweep signal having a third slope different from the first and second slopes to the blue pixel; and a controller which controls the data driver, the scan driver, and the sweep driver, wherein each of the red pixel, the green pixel, and the blue pixel includes: a light emitting element; a pulse width modulation circuit which receives the data voltage in response to the scan signal and generates a pulse width modulation signal based on the data voltage and a corresponding one of the first, second and third sweep signals; and a current generation circuit which provides a current to the light emitting element based on the pulse width modulation signal, and the first slope of the first sweep signal, the second slope of the second sweep signal, and the third slope of the third sweep signal are changed in a plurality of modes having different maximum luminances.