# US 10,503,307 B2 · Flexible display device and driving method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,503,307 B2 - Document ID: US10503307B2 - Status: Granted - Kind: B2 - Application number: 15/196,517 - Filed: 2016-06-29 - Published: 2017-05-04 - Granted: 2019-12-10 - Earliest claimed: 2015-11-04 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Won-ki Hong; Beomshik Kim; Jongseo Lee - Web page: https://patentgrep.com/patent/US10503307B2 ## CPC - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 1/1641: {the display being formed by a plurality of foldable display components (G06F1/1647 takes precedence)} - G06F 1/1652: {the display being flexible, e.g. mimicking a sheet of paper, or rollable} - G06F 3/045: using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact - G09G 3/001: {using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background (slide projectors per se G03B23/00 = 42 HP)} - G09G 3/035: {for flexible display surfaces} - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - 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 - H10K 59/131: Interconnections, e.g. wiring lines or terminals - G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - H10K 77/111: {Flexible substrates} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A flexible display device includes a flexible display panel to generate an image and a bending detection screen to detect a bending angle and a bending position. The bending detection screen includes an angle detection sensor and a position detection sensor. The angle detection sensor includes a material with a resistance that changes in correspondence to an intensity of an applied stress. The angle detection sensor has an area per unit length that is substantially constant on a base surface. The position detection sensor includes a material with a resistance that changes in correspondence to an intensity of the applied stress. The position detection sensor has an area per unit length that increases along a length direction on the base surface. Signal lines are connected to the angle and position detection sensors. ## Claims ### Claim 1 A flexible display device, comprising: a flexible display panel to generate an image; and a bending detection screen to detect a bending angle and a bending position, wherein the bending detection screen includes: an angle detection resistive sensor having an area per unit length that is substantially constant on a base surface; a position detection resistive sensor having an area per unit length that increases along a length direction on the base surface such that a slope of a resistance change rate of the position detection resistive sensor according to the bending angle increases along the length direction; signal lines connected to the angle and position detection resistive sensors; and a bending detection circuit configured to detect resistance change values of the angle detection resistive sensor and the position detection resistive sensor in correspondence to an applied stress. ### Claim 2 (depends on 1) The flexible display device as claimed in claim 1, wherein the angle detection resistive sensor includes: an angle detection horizontal resistive sensor extending in a first direction; and an angle detection vertical resistive sensor extending in a second direction intersecting the first direction. ### Claim 3 (depends on 2) The flexible display device as claimed in claim 2, wherein: the angle detection horizontal resistive sensor includes first and second angle detection horizontal resistive sensors, each of the first and the second angle detection horizontal resistive sensors extending in the first direction and wherein the first and the second angle detection horizontal resistive sensors spaced apart from each other in the second direction; and the angle detection vertical resistive sensor includes first and second angle detection vertical resistive sensors, each of the first and the second angle detection vertical resistive sensors extending in the second direction and the first and the second angle detection vertical resistive sensors spaced apart from each other in the first direction. ### Claim 4 (depends on 3) The flexible display device as claimed in claim 3, wherein: each of the first and second angle detection vertical resistive sensors includes a first sub detection resistive sensor and a second sub detection resistive sensor, each of the first sub detection resistive sensor and the second sub detection resistive sensor extends in the second direction, and the first sub detection resistive sensor and the second sub detection resistive sensor are spaced apart from each other in the second direction. ### Claim 5 (depends on 3) The flexible display device as claimed in claim 3, wherein the signal lines includes: at least one first signal line to provide a driving voltage to the first and second angle detection horizontal resistive sensors and the first and second angle detection vertical resistive sensors; and second signal lines respectively connected to the first and second angle detection horizontal resistive sensors and the first and second angle detection vertical resistive sensors. ### Claim 6 (depends on 2) The flexible display device as claimed in claim 2, wherein: the position detection resistive sensor includes first and second position detection horizontal resistive sensors, each of the first and second position detection horizontal resistive sensors extending in the first direction, the first and second position detection horizontal resistive sensors spaced apart from each other in the second direction; and first and second position detection vertical resistive sensors, each of the first and second position detection vertical resistive sensors extending in the second direction, the first and second position detection vertical resistive sensors spaced apart from each other in the first direction. ### Claim 7 (depends on 6) The flexible display device as claimed in claim 6, wherein the signal lines include: at least one first signal line to provide a driving voltage to the first and second position detection horizontal resistive sensors and the first and second position detection vertical resistive sensors; and second signal lines respectively connected to the first and second position detection horizontal resistive sensors and the first and second position detection vertical resistive sensors. ### Claim 8 (depends on 7) The flexible display device as claimed in claim 7, wherein the first signal line is commonly connected to ends of the first and second position detection horizontal resistive sensors and the first and second position detection vertical resistive sensors. ### Claim 9 (depends on 6) The flexible display device as claimed in claim 6, wherein a width of the first position detection horizontal resistive sensor increases linearly in the first direction. ### Claim 10 (depends on 6) The flexible display device as claimed in claim 6, wherein the first horizontal detection resistive sensor includes an ith sensor portion, an i+1th sensor portion having a larger area than the ith sensor portion, and connection lines connecting the ith sensor portion and the i+1th sensor portion. ### Claim 11 (depends on 6) The flexible display device as claimed in claim 6, wherein the first position detection horizontal resistive sensor includes: k sensor potions having different lengths from each other in the first direction and arranged in the second direction, and k−1 connection lines connecting the k sensor portions, wherein ends of the k sensor portions are arranged on a reference line; and an ith connection line among the k−1 connection lines connects an end of an ith sensor portion among the k sensor portions and an end of an i+1th sensor portion, and an i+1th connection line among the k−1 connection lines connects the other end of the i+1th sensor portion among the k sensor portions and one end of an i+2th sensor portion. ### Claim 12 (depends on 11) The flexible display device as claimed in claim 11, wherein each of the k sensor portions has an area per unit length that is substantially constant. ### Claim 13 (depends on 1) The flexible display device as claimed in claim 1, wherein the bending detection screen includes a flexible base member having the base surface. ### Claim 14 (depends on 13) The flexible display device as claimed in claim 13, wherein the angle detection resistive sensor, the position detection resistive sensor, and the signal lines are on a same surface. ### Claim 15 (depends on 1) The flexible display device as claimed in claim 1, wherein the display panel provides the base surface, and the angle detection resistive sensor, the position detection resistive sensor, and the signal lines are on a same surface. ### Claim 16 (depends on 1) The flexible display device as claimed in claim 1, further comprising: a window to provide an input surface of an input device, wherein the window includes a black matrix partially overlapping a base. ### Claim 17 (depends on 16) The flexible display device as claimed in claim 16, wherein the angle detection resistive sensor, the position detection resistive sensor, and the signal lines overlap the black matrix. ### Claim 18 A method for driving a display device, the method comprising: measuring a resistance change value of an angle detection resistive sensor, the angle detection resistive sensor including a material with a resistance that changes in correspondence to intensity of an applied stress and having an area per unit length that is substantially constant; measuring a resistance change value of a position detection resistive sensor, the position detection resistive sensor including a material with a resistance that changes in correspondence to intensity of the applied stress and having an area per unit length that is increased along a length direction such that a slope of a resistance change rate of the position detection resistive sensor according to the bending angle increases along the length direction; calculating a bending angle of a bending event based on the resistance change value of the angle detection resistive sensor; and calculating a bending position of the bending event based on the resistance change value of the angle detection resistive sensor and a resistance change value of the position detection resistive sensor. ### Claim 19 (depends on 18) The method as claimed in claim 18, further comprising: re-measuring the resistance change values of the angle detection resistive sensor and the position detection resistive sensor; determining an occurrence of an additional bending event based on the re-measured resistance change values; and calculating a bending angle and a bending position of an additional bending event based on the re-measured resistance change values. ### Claim 20 (depends on 18) The method as claimed in claim 18, wherein: the position detection resistive sensor includes first and second position detection horizontal resistive sensors, each of the first and second position detection horizontal resistive sensors extending in a first direction and the first and second position detection horizontal resistive sensors spaced in a second direction intersecting the first direction; and first and second position detection vertical resistive sensors, each of the first and second position detection vertical resistive sensors extending in the second direction and the first and second position detection vertical resistive sensors spaced apart from each other in the first direction, and the method includes measuring of the resistance change value of the position detection resistive sensor includes simultaneously measuring resistance change values of the first and second position detection horizontal resistive sensors and the first and second position detection vertical resistive sensors.