# US 2013/0154965 A1 · Touch detection system 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 2013/0154965 A1 - Document ID: US20130154965A1 - Status: Published application - Kind: A1 - Application number: 13/572,575 - Filed: 2012-08-10 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Inventors: Hee-Chul Hwang; Dong-Won Lee; Joo-Hyung Lee - Web page: https://patentgrep.com/patent/US20130154965A1 ## CPC - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - 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: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A touch sensing system for detecting at least one touch is provided. The touch sensing system includes a touch sensing unit having a plurality of touchable regions for outputting sensing signals of the at least one touch, an operating unit for determining difference values between the sensing signals and a baseline value, a group setting unit for grouping ones of the regions in which the difference values exist into one or more groups, and a threshold value determining unit for determining maximum difference values from the groups to determine first threshold values of the groups corresponding to the determined maximum difference values. The touch sensing system increases the correctness of the touch detection by adaptively changing the first threshold value in accordance with the touch strength. A method of driving the touch sensing system is also provided. ## Claims ### Claim 1 A touch sensing system for detecting at least one touch, the touch sensing system comprising: a touch sensing unit comprising a plurality of touchable regions for outputting sensing signals of the at least one touch; an operating unit for determining difference values between the sensing signals and a baseline value; a group setting unit for grouping ones of the regions in which the difference values exist into one or more groups; and a threshold value determining unit for determining maximum difference values from the groups to determine first threshold values of the groups corresponding to the determined maximum difference values. ### Claim 2 (depends on 1) The touch sensing system as claimed in claim 1, further comprising a touch determining unit for determining touched regions from the ones of the regions whose difference values are larger than their corresponding first threshold values. ### Claim 3 (depends on 2) The touch sensing system as claimed in claim 2, wherein the touched regions correspond to the at least one touch. ### Claim 4 (depends on 1) The touch sensing system as claimed in claim 1, wherein the group setting unit is configured to group adjacent regions from the ones of the regions into a same group. ### Claim 5 (depends on 1) The touch sensing system as claimed in claim 1, wherein the threshold value determining unit is configured to multiply a first ratio by the determined maximum difference values to calculate the first threshold values of the groups. ### Claim 6 (depends on 5) The touch sensing system as claimed in claim 5, wherein the first ratio is set to a value between 0 and 1. ### Claim 7 (depends on 1) The touch sensing system as claimed in claim 1, wherein the touch sensing unit comprises first sensor electrodes and second sensor electrodes that cross each other to implement a capacitance method of touch sensing. ### Claim 8 (depends on 1) The touch sensing system as claimed in claim 1, in which the difference values exist when they exceed a second threshold value. ### Claim 9 (depends on 1) The touch sensing system as claimed in claim 1, in which the difference values exist when they are not 0. ### Claim 10 (depends on 1) The touch sensing system as claimed in claim 1, wherein the touch sensing unit is a touch screen. ### Claim 11 A method of driving a touch sensing system for detecting at least one touch, the method comprising: outputting sensing signals of the at least one touch from a plurality of touchable regions of a touch sensing unit; determining difference values between the sensing signals and a baseline value; grouping ones of the regions in which the difference values exist into one or more groups; and determining maximum difference values from the groups to determine first threshold values of the groups corresponding to the determined maximum difference values. ### Claim 12 (depends on 11) The method as claimed in claim 11, further comprising determining touched regions from the ones of the regions whose difference values are larger than their corresponding first threshold values. ### Claim 13 (depends on 12) The method as claimed in claim 12, wherein the touched regions correspond to the at least one touch. ### Claim 14 (depends on 11) The method as claimed in claim 11, wherein the grouping the ones of the regions comprises grouping adjacent regions from the ones of the regions into a same group. ### Claim 15 (depends on 11) The method as claimed in claim 11, wherein the determining the maximum difference values from the groups to determine the first threshold values of the groups corresponding to the determined maximum difference values comprises multiplying a first ratio by the determined maximum difference values to calculate the first threshold values of the groups. ### Claim 16 (depends on 15) The method as claimed in claim 15, wherein the first ratio is set to a value between 0 and 1. ### Claim 17 (depends on 11) The method as claimed in claim 11, wherein the touch sensing unit comprises first sensor electrodes and second sensor electrodes that cross each other to implement a capacitance method of touch sensing. ### Claim 18 (depends on 11) The method as claimed in claim 11, in which the difference values exist when they exceed a second threshold value. ### Claim 19 (depends on 11) The method as claimed in claim 11, in which the difference values exist when they are not 0. ### Claim 20 (depends on 11) The method as claimed in claim 11, wherein the touch sensing unit is a touch screen.