Touchscreen Water Rejection for Accurate Capacitive Touch Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices misidentify touch operations due to water on the touchscreen, leading to inaccurate responses and poor user experience.
Innovation Solution
An electronic device identifies touch operations by detecting first touch information, determining touch areas based on capacitive signal strengths, and distinguishing between finger touch and water touch areas using historical touch information to suppress misidentification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device identifies touch operations based on capacitive signal strength changes, then the touch operation identification is simple and fast, but water on the touchscreen causes misidentification and inaccurate response
Solution Approach 1:
The touch area is divided into multiple sub-areas, and capacitive signal strength changes are analyzed separately for each sub-area. By comparing the distribution pattern of signal changes across sub-areas, the system can distinguish between water (which typically affects multiple sub-areas) and finger touch (which concentrates in specific sub-areas), thereby improving identification accuracy in the presence of water.
Solution Approach 2:
The system transitions from analyzing only the magnitude of capacitive signal strength changes to analyzing the spatial distribution pattern of these changes across multiple sub-areas. This dimensional expansion from scalar to spatial analysis enables the system to differentiate between water and finger touch based on their distinct spatial characteristics.
2Speed
If the electronic device uses capacitive signal threshold comparison to identify touch points, then the response speed is fast, but it cannot distinguish between water-induced signal changes and actual finger touches
Solution Approach 1:
The touchscreen is divided into multiple sub-areas, and the system analyzes capacitive signal strength changes in each sub-area separately. By examining the spatial distribution pattern of signal changes across sub-areas, the system can quickly distinguish between water (affecting multiple sub-areas) and finger touch (concentrated in specific sub-areas), maintaining fast response while improving accuracy.
Solution Approach 2:
The system adds a spatial distribution dimension to the touch detection process, analyzing not just the magnitude but also the location and distribution of capacitive signal changes across multiple sub-areas. This enables rapid differentiation between water and finger touch based on their distinct spatial patterns.
3Productivity
If the electronic device reports all detected touch points, then the system responds to all potential touches, but it incorrectly responds to water-induced touch effects
Solution Approach 1:
The system segments the touch area into multiple sub-areas and analyzes the distribution pattern of capacitive signal changes across these sub-areas. By comparing the spatial distribution characteristics, the system can identify whether detected touches are from water (affecting multiple sub-areas) or finger (concentrated in specific sub-areas), thereby selectively reporting only valid touch points and eliminating false responses to water.
Solution Approach 2:
The system introduces spatial distribution analysis as an additional dimension for touch validation. By examining not just the presence but also the location and distribution of capacitive signal changes across multiple sub-areas, the system can reliably distinguish between water-induced effects and actual finger touches, ensuring accurate response reporting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately identifies touch operations, preventing misidentification and improving user experience by suppressing responses to water-induced touch effects.
Implementation Method 1
an electronic device mainly identifies a touch location of a user based on a change of a capacitive signal on a touchscreen
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This application discloses a method for identifying a touch operation and an electronic device, and relates to the field of terminal technologies. This can improve accuracy of identifying a touch operation of a user, and further ensure accurate response to the touch operation of the user. In particular, when there is water on a touchscreen of the electronic device, a problem of misidentification and misresponse of a touch point caused by the water can be avoided. In this application, the electronic device can identify whether there is water in a touch area, for example, static water, and can identify whether there is water whose track changes in the touch area, and after identifying the water, the electronic device adopts a corresponding suppression means, for example, suppressing response to touch effect of the touch area where there is water, suppressing response to touch effect of the touch area through which water passes, and suppressing response to touch effect within a preset range of a historical touch track. This can avoid a problem of misidentification and misresponse of a touch point caused by the water, and improve user experience.