# US 2022/0044641 A1 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0044641 A1 - Document ID: US20220044641A1 - Status: Published application - Kind: A1 - Application number: 17/205,119 - Filed: 2021-03-18 - Published: 2022-02-10 - Earliest claimed: 2020-08-10 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Chae Hee PARK; Jong Soo KIM - Web page: https://patentgrep.com/patent/US20220044641A1 ## CPC - G09G 3/3275: Details of drivers for data electrodes - G09G 2300/0413: Details of dummy pixels or dummy lines in flat panels - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes - G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - 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 dummy data unit connected to one end portion of a data line, where the dummy data unit supplies a dummy data signal to the data line; a sensing unit connected to an opposing end portion of the data line, where the sensing unit determines a load of the data line based on the dummy data signal supplied thereto through the data line; and a timing controller which controls a supply timing of a data signal to be supplied to the data line, based on the load. ## Claims ### Claim 1 A display device comprising: a dummy data unit connected to one end portion of a data line, wherein the dummy data unit supplies a dummy data signal to the data line; a sensing unit connected to an opposing end portion of the data line, wherein the sensing unit senses a load of the data line based on the dummy data signal supplied thereto through the data line; and a timing controller which controls a supply timing of a data signal to be to supplied to the data line, based on the load of the data line. ### Claim 2 (depends on 1) The display device of claim 1, further comprising: a data driver which supplies the data signal to the data line; and a gate driver which supplies a gate signal to a gate line. ### Claim 3 (depends on 2) The display device of claim 2, wherein the dummy data unit is disposed in the gate driver, and the sensing unit is disposed in the data driver. ### Claim 4 (depends on 3) The display device of claim 3, further comprising: a connection line electrically connecting the dummy data unit and the data line to each other; and a switching element connected between the connection line and the dummy data unit. ### Claim 5 (depends on 4) The display device of claim 4, wherein the data line supplied with the dummy data signal is disposed adjacent to the gate driver. ### Claim 6 (depends on 4) The display device of claim 4, wherein the switching element is turned on when the dummy data signal is supplied to the data line, and the switching element maintains a turn-off state when the data signal is to supplied to the data line. ### Claim 7 (depends on 1) The display device of claim 1, wherein the sensing unit includes: a converter which converts the dummy data signal into dummy delay data in a digital form; and a delay calculator which generates a data delay value based on the dummy delay data. ### Claim 8 (depends on 7) The display device of claim 7, wherein the data delay value is a first delay value corresponding to a biggest load of the data line. ### Claim 9 (depends on 8) The display device of claim 8, wherein the delay calculator pre-stores a second data delay value corresponding to a smallest load and additionally calculates a third data delay value corresponding to an intermediate load based on the first data delay value and the second data delay value. ### Claim 10 (depends on 2) The display device of claim 2, wherein the data driver includes: a shift register which generates an activation signal; a holding latch which is supplied with and sequentially stores data from the timing controller in response to the activation signal; a control latch simultaneously supplied with the data stored in the holding latch when a source output enable signal is supplied thereto; a digital-to-analog converter which is supplied with the data from the to control latch when the source output enable signal is supplied to the control latch and generates the data signal based on the data supplied thereto from the control latch; and a buffer which transfers the data signal to the data line. ### Claim 11 (depends on 10) The display device of claim 10, wherein the timing controller controls a supply timing of the data signal by changing a supply timing of the source output enable signal. ### Claim 12 (depends on 2) The display device of claim 2, wherein the dummy data unit is disposed at one end portion of the gate driver, and the sensing unit is disposed at an opposing end portion of the gate driver. ### Claim 13 (depends on 12) The display device of claim 12, further comprising: a first connection line electrically connecting the dummy data unit and the data line to each other; a second connection line electrically connecting the sensing unit and the data line to each other; a first switching element connected between the first connection line and the dummy data unit; and a second switching element connected between the second connection to line and the sensing unit. ### Claim 14 (depends on 12) The display device of claim 12, wherein a line electrically connecting the dummy data unit and the sensing unit to each other is a dummy data line. ### Claim 15 (depends on 2) The display device of claim 2, wherein the sensing unit is electrically connected to at least two points of a specific gate line and determines a load of the specific gate line based on a gate signal supplied thereto from the at least two points. ### Claim 16 (depends on 15) The display device of claim 15, wherein the specific gate line is disposed adjacent to the data driver. ### Claim 17 (depends on 15) The display device of claim 15, wherein the sensing unit includes: a first converter which converts the dummy data signal into dummy delay data in a digital form; a second converter which converts the gate signal from the at least two points into gate sensing data in a digital form; and a delay calculator which generates a data delay value based on the dummy delay data and the gate sensing data. ### Claim 18 (depends on 2) The display device of claim 2, wherein the data driver includes: a first data driver disposed at one side of a display panel; and to a second data driver disposed at an opposing side of the display panel, and wherein the dummy data unit is disposed in the first data driver, and the sensing unit is disposed in the second data driver. ### Claim 19 (depends on 2) The display device of claim 2, wherein the dummy data unit is disposed in the data driver disposed at one side of a display panel, and the sensing unit is disposed at an opposing side of the display panel or in the gate driver, and wherein the display device further comprises a connection line electrically connecting the sensing unit and the data line to each other. ### Claim 20 (depends on 2) The display device of claim 2, wherein the timing controller further includes: a source output enable signal controller which controls a supply timing of the data signal; an over-driving controller which controls an over-driving voltage, based on the load; and an amplifier bias controller which controls a bias current to be supplied to amplifiers included in the data driver, based on the load.