# US 2019/0102030 A1 · Display device with touch detection function > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0102030 A1 - Document ID: US20190102030A1 - Status: Published application - Kind: A1 - Application number: 16/139,963 - Filed: 2018-09-24 - Published: 2019-04-04 - Earliest claimed: 2017-09-29 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Yuto KAKINOKI; Naoki TAKADA - Web page: https://patentgrep.com/patent/US20190102030A1 ## CPC - G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 3/041662: {using alternate mutual and self-capacitive scanning} - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 3/04182: {Filtering of noise external to the device and not generated by digitiser components} - G06F 3/0443: {using a single layer of sensing electrodes} - G06F 2203/04105: Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A display device with a touch detection function includes a touch detection electrode, first and second electrodes, a touch detection controller, and a force detection controller. The force detection controller performs interpolation processing on reference values to calculate an interpolation value when a reference force is applied to a position in an input surface at which a force has been applied by an object and calculates a force detection value based on a ratio of a detection value detected based on capacitance between first and second electrodes to the interpolation value. The position at which the force is applied is specified based on a position detected by the touch detection controller as a position of contact with the input surface by the object. The reference values are detected based on the capacitance between the first and second electrodes when the reference force is applied to reference positions. ## Claims ### Claim 1 A display device with a touch detection function, the display device comprising: a first substrate having an input surface; a touch detection electrode provided to the first substrate and facing the input surface; a first electrode provided to a second substrate and facing the touch detection electrode; a second electrode facing the first electrode with a dielectric layer interposed between the first electrode and the second electrode; a touch detection controller configured to detect a position at which a detection target object is in contact with or in proximity to the input surface based on capacitance between the first electrode and the touch detection electrode; a force detection controller configured to detect a force applied to the input surface by the detection target object based on capacitance between the first electrode and the second electrode and calculate a force detection value indicating the force; and storage configured to store therein a plurality of reference values detected by the force detection controller, wherein the force detection controller configured to perform interpolation processing on the reference values to calculate an interpolation value when a reference force is applied to a position at which the force has been applied, and calculate the force detection value based on a ratio of a detection value detected based on the capacitance between the first electrode and the second electrode relative to the interpolation value, wherein the position at which the force is applied is specified based on a position detected by the touch detection controller as the position of contact with the input surface by the detection target object, and wherein the reference values are detected based on the capacitance between the first electrode and the second electrode when the reference force is applied to a plurality of reference positions. ### Claim 2 (depends on 1) The display device with a touch detection function according to claim 1, wherein the display device comprises a plurality of the second electrodes, wherein the storage stores therein a plurality of reference values of a first group for one second electrode that are detected based on capacitance between the first electrode and the one second electrode when the reference force is applied to the reference positions, wherein the force detection controller performs the interpolation processing on the reference values of the first group to calculate a first interpolation value when the reference force is applied to the position at which the force has been applied, calculates a first ratio of a first detection value detected based on capacitance between the first electrode and the one second electrode relative to the first interpolation value, detects a plurality of reference values of a second group for another second electrode based on capacitance between the first electrode and the other second electrode when the reference force is applied to the reference positions, performs the interpolation processing on the reference values of the second group to calculate a second interpolation value when the reference force is applied to the position at which the force has been applied, calculates a second ratio of a second detection value detected based on capacitance between the first electrode and the other second electrode relative to the second interpolation value, calculates a weighted average or an average of the first ratio and the second ratio, and calculates the force detection value based on the weighted average or the average. ### Claim 3 (depends on 1) The display device with a touch detection function according to claim 1, wherein the display device comprises a plurality of the second electrodes, wherein the storage stores therein a plurality of reference values of a first group for one second electrode that are detected based on capacitance between the first electrode and the one second electrode when the reference force is applied to the reference positions, and wherein the force detection controller performs the interpolation processing on the reference values of the first group to calculate a first interpolation value when the reference force is applied to the position at which the force has been applied, detects a plurality of reference values of a second group for another second electrode based on capacitance between the first electrode and the other second electrode when the reference force is applied to the reference positions, performs the interpolation processing on the reference values of the second group to calculate a second interpolation value when the reference force is applied to the position at which the force has been applied, calculates a first average of the first interpolation value and the second interpolation value, calculates a second average of a first detection value detected based on the capacitance between the first electrode and the one second electrode and a second detection value detected based on the capacitance between the first electrode and the other second electrode, and calculates the force detection value based on a ratio of the first average relative to the second average. ### Claim 4 (depends on 1) The display device with a touch detection function according to claim 1, wherein the force detection controller detects the force applied to the input surface by the detection target object in a period during which the touch detection controller detects the position at which the detection target object is in contact with or in proximity to the input surface. ### Claim 5 (depends on 1) The display device with a touch detection function according to claim 1, wherein the dielectric layer includes an air gap. ### Claim 6 (depends on 1) The display device with a touch detection function according to claim 1, wherein the dielectric layer includes a multilayered body included in a configuration of a backlight illuminating the input surface. ### Claim 7 (depends on 6) The display device with a touch detection function according to claim 6, wherein the second electrode is provided on a surface of the multilayered body opposite to a surface on a side of the input surface. ### Claim 8 (depends on 6) The display device with a touch detection function according to claim 6, wherein the second electrode is provided on a surface of the multilayered body on a side of the input surface. ### Claim 9 (depends on 6) The display device with a touch detection function according to claim 6, wherein the second electrode is provided in an inner layer of the multilayered body. ### Claim 10 (depends on 1) The display device with a touch detection function according to claim 1, wherein the interpolation processing is polynomial interpolation or linear interpolation. ### Claim 11 A display device with a touch detection function, the display device comprising: a first substrate having an input surface; a first electrode provided to the first substrate; a second electrode facing the first electrode with a dielectric layer interposed between the first electrode and the second electrode; a touch detection controller configured to detect a position at which a detection target object is in contact with or in proximity to the input surface based on capacitance of the first electrode; and a force detection controller configured to detect a force applied to the input surface by the detection target object based on capacitance between the first electrode and the second electrode and calculate a force detection value indicating the force; and storage configured to store therein a plurality of reference values detected by the force detection controller, wherein the force detection controller configured to perform interpolation processing on the reference values to calculate an interpolation value when a reference force is applied to a position at which the force has been applied, and calculate the force detection value based on a ratio of a detection value detected based on the capacitance between the first electrode and the second electrode relative to the interpolation value, wherein the position at which the force has been applied is specified based on a position detected by the touch detection controller as the position of contact with the input surface by the detection target object, and wherein the reference values are detected based on the capacitance between the first electrode and the second electrode when the reference force is applied to a plurality of reference positions. ### Claim 12 (depends on 11) The display device with a touch detection function according to claim 11, wherein the storage stores therein a plurality of reference values of a first group for one portion of the second electrode that are detected based on capacitance between the first electrode and the one portion of the second electrode when the reference force is applied to the reference positions, and wherein the force detection controller performs the interpolation processing on the reference values of the first group to calculate a first interpolation value when the reference force is applied to the position at which the force has been applied, calculates a first ratio of a first detection value detected based on capacitance between the first electrode and the one portion relative to the first interpolation value, detects a plurality of reference values of a second group for another portion of the second electrode based on capacitance between the first electrode and the other portion of the second electrode when the reference force is applied to the reference positions, performs the interpolation processing on the reference values of the second group to calculate a second interpolation value when the reference force is applied to the position at which the force has been applied, calculates a second ratio of a second detection value detected based on capacitance between the first electrode and the other portion relative to the second interpolation value, calculates a weighted average or an average of the first ratio and the second ratio, and calculates the force detection value based on the weighted average or the average. ### Claim 13 (depends on 11) The display device with a touch detection function according to claim 11, wherein the storage stores therein a plurality of reference values of a first group for one portion of the second electrode that are detected based on capacitance between the first electrode and the one portion of the second electrode when the reference force is applied to the reference positions, and wherein the force detection controller performs the interpolation processing on the reference values of the first group to calculate a first interpolation value when the reference force is applied to the position at which the force has been applied, detects a plurality of reference values of a second group for another portion of the second electrode based on capacitance between the first electrode and the other portion of the second electrode when the reference force is applied to the reference positions, performs the interpolation processing on the reference values of the second group to calculate a second interpolation value when the reference force is applied to the position at which the force has been applied, calculates a first average of the first interpolation value and the second interpolation value, calculates a second average of a first detection value detected based on capacitance between the first electrode and the one portion and a second detection value detected based on the capacitance between the first electrode and the other portion, and calculates the force detection value based on a ratio of the first average relative to the second average. ### Claim 14 (depends on 11) The display device with a touch detection function according to claim 11, wherein the force detection controller detects the force applied to the input surface by the detection target object in a period during which the touch detection controller detects the position at which the detection target object is in contact with or in proximity to the input surface. ### Claim 15 (depends on 11) The display device with a touch detection function according to claim 11, wherein the dielectric layer includes an air gap. ### Claim 16 (depends on 11) The display device with a touch detection function according to claim 11, wherein the dielectric layer includes a multilayered body included in a configuration of a backlight illuminating the input surface. ### Claim 17 (depends on 16) The display device with a touch detection function according to claim 16, wherein the second electrode is provided on a surface of the multilayered body opposite to a surface on a side of the input surface. ### Claim 18 (depends on 16) The display device with a touch detection function according to claim 16, wherein the second electrode is provided on a surface of the multilayered body on a side of the input surface. ### Claim 19 (depends on 16) The display device with a touch detection function according to claim 16, wherein the second electrode is provided in an inner layer of the multilayered body. ### Claim 20 (depends on 11) The display device with a touch detection function according to claim 11, wherein the interpolation processing is polynomial interpolation or linear interpolation.