# US 2017/0255283 A1 · Touch Sensitive Processing Method, Apparatus and System for Calibrating Pressure Value to Stylus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0255283 A1 - Document ID: US20170255283A1 - Status: Published application - Kind: A1 - Application number: 15/448,798 - Filed: 2017-03-03 - Published: 2017-09-07 - Earliest claimed: 2016-03-03 - Assignees: Egalax_Empia Technology Inc. - Applicants: Egalax_Empia Technology Inc. - Inventors: SHANG-TAI YEH - Web page: https://patentgrep.com/patent/US20170255283A1 ## CPC - G06F 3/03545: {Pens or stylus} - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G06F 3/04162: {for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware} - G06F 2203/04104: Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger - 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 The present invention provides a touch sensitive processing method for calibrating a pressure value to a stylus. The method includes receiving a pressure value to the stylus; receiving a tilt angle between the shaft of the stylus and a touch screen plane; and calculating a calibrated pressure value based on the pressure value and the tilt angle. ## Claims ### Claim 1 A touch sensitive processing method for calibrating a pressure value to a stylus comprising: receiving a pressure value experienced by the stylus; receiving a tilt angle between the shaft of the stylus and a touch screen plane; and calculating a calibrated pressure value based on the pressure value and the tilt angle. ### Claim 2 (depends on 1) The touch sensitive processing method of claim 1, wherein the calibrated pressure value equals to the product of the pressure value and a calibration function of the tilt angle. ### Claim 3 (depends on 2) The touch sensitive processing method of claim 2, wherein the calibrated pressure value equals to the product of said product and an error parameter K plus an error value E. ### Claim 4 (depends on 1) The touch sensitive processing method of claim 1, further comprising adjusting a display content parameter of the touch screen based on the calibrated pressure value. ### Claim 5 (depends on 1) The touch sensitive processing method of claim 1, further comprising detecting the pressure value experienced by the stylus based on electrical signals emitted from the stylus received by a plurality of touch sensitive electrodes of the touch screen. ### Claim 6 (depends on 1) The touch sensitive processing method of claim 1, further comprising detecting the tilt angle between the stylus shaft and the touch screen plane based on electrical signals emitted from a plurality of electrodes of the stylus received by a plurality of touch sensitive electrodes of the touch screen. ### Claim 7 A touch sensitive processing apparatus for calibrating a pressure value to a stylus, comprising: a sensing circuit connected to a plurality of touch sensitive electrodes of a touch screen to which the stylus is in proximity or touching for detecting a pressure value experienced by the stylus based on electrical signals emitted from the stylus received by the plurality of touch sensitive electrodes; and a processor connected to the sensing circuit for receiving a tilt angle between the shaft of the stylus and a touch screen plane, and calculating a calibrated pressure value based on the pressure value and the tilt angle. ### Claim 8 (depends on 7) The touch sensitive processing apparatus of claim 7, wherein the calibrated pressure value equals to the product of the pressure value and a calibration function of the tilt angle. ### Claim 9 (depends on 8) The touch sensitive processing apparatus of claim 8, wherein the calibrated pressure value equals to the product of said product and an error parameter K plus an error value E. ### Claim 10 (depends on 7) The touch sensitive processing apparatus of claim 7, wherein the electrical signals are emitted from a plurality of electrodes on the stylus, and the sensing circuit is further configured for detecting the tilt angle based on the electrical signals emitted from the stylus received by the plurality of touch sensitive electrodes. ### Claim 11 A touch sensitive processing apparatus for calibrating a pressure value to a stylus comprising: a sensing circuit connected to a plurality of touch sensitive electrodes of a touch screen to which the stylus is in proximity or touching for detecting a tilt angle between the shaft of the stylus and a touch screen plane based on electrical signals emitted from a plurality of electrodes of the stylus received by the plurality of touch sensitive electrodes; and a processor connected to the sensing circuit for receiving a pressure value experienced by the stylus, and calculating a calibrated pressure value based on the pressure value and the tilt angle. ### Claim 12 (depends on 11) The touch sensitive processing apparatus of claim 11, wherein the calibrated pressure value equals to the product of the pressure value and a calibration function of the tilt angle. ### Claim 13 (depends on 11) The touch sensitive processing apparatus of claim 11, wherein the calibrated pressure value equals to the product of said product and an error parameter K plus an error value E. ### Claim 14 (depends on 11) The touch sensitive processing apparatus of claim 11, wherein the sensing circuit is further configured for detecting the pressure value based on the electrical signals emitted from the stylus received by the plurality of touch sensitive electrodes. ### Claim 15 (depends on 11) The touch sensitive processing apparatus of claim 11, wherein the sensing circuit is further configured for detecting the pressure value based on electrical signals transmitted and received by the plurality of touch sensitive electrodes. ### Claim 16 A touch sensitive system for calibrating a pressure value to a stylus comprising: a stylus for emitting electrical signals; a touch screen including a plurality of touch sensitive electrodes; and a touch sensitive processing apparatus connected with the touch screen including: a sensing circuit connected to the plurality of touch sensitive electrod for detecting a pressure value experienced by the stylus based on the electrical signals emitted from the stylus received by the plurality of touch sensitive electrodes; and a processor connected to the sensing circuit for receiving a tilt angle between the shaft of the stylus and a touch screen plane, and calculating a calibrated pressure value based on the pressure value and the tilt angle. ### Claim 17 A touch sensitive system for calibrating a pressure value to a stylus comprising: a stylus for emitting electrical signals; a touch screen including a plurality of touch sensitive electrodes; and a touch sensitive processing apparatus connected with the touch screen including: a sensing circuit connected to the plurality of touch sensitive electrodes for detecting a tilt angle between the shaft of the stylus and a touch screen plane based on the electrical signals emitted from a plurality of electrodes of the stylus received by the plurality of touch sensitive electrodes; and a processor connected to the sensing circuit for receiving a pressure value experienced by the stylus, and calculating a calibrated pressure value based on the pressure value and the tilt angle.