Touch Positioning Using Pre-Lift Track Data
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Solution Overview
Problem
Inaccurate terminal positioning occurs when a user's finger leaves a capacitive touch screen due to uneven deformation of the contact area, causing deviations in calculated tapping positions.
Innovation Solution
A touch positioning method that records first track information of a contact point on a capacitive touch screen, determines second track information before the contact point leaves the screen by discarding information within a specific time period where the contact range continuously changes, and calculates the position based on the contact range at the sampling time point immediately before this period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If track information is used during the process when the contact point leaves the touch screen, then the positioning can be continuous, but the positioning accuracy deteriorates due to uneven deformation of the contact area
Solution Approach 1:
The patent applies preliminary action by identifying and recording the position of the contact point before the leaving process begins. The controller detects when the contact point is about to leave the touch screen and records its position at that moment, rather than attempting to track it during the deformation phase. This ensures accurate positioning by capturing data before the harmful deformation occurs.
Solution Approach 2:
The patent segments the touch interaction process into distinct phases: normal contact phase and leaving phase. By detecting the transition between these phases and selectively processing track information from only the normal contact phase, the system maintains positioning accuracy while ensuring continuity through proper phase identification and transition handling.
2Ease of operation
If the contact area is allowed to deform naturally during the leaving process, then the finger movement is natural, but the calculated position deviates from the actual tapping position
Solution Approach 1:
The system performs preliminary recording of the contact point position before the leaving process causes deformation. By capturing the position at the moment before natural deformation begins, the system maintains both the naturalness of finger movement and the accuracy of position calculation.
Solution Approach 2:
The patent converts the harmful effect of contact area deformation into a detectable signal. By monitoring changes in contact area characteristics, the system identifies the leaving process and uses this information to select appropriate track data for positioning, thereby maintaining accuracy despite the natural deformation that occurs.
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
This method accurately positions the contact point before it leaves the screen, enhancing the accuracy of terminal positioning and user experience by using track information that indicates the actual tapping position.
Implementation Method 1
When a user's finger is in contact with the touch screen, because of existence of a human electric field, a coupling capacitor is formed at a position of a contact point between the finger and the thin-film conductor layer
Implementation Method 2
a low-voltage alternating electric field is formed in the thin-film conductor layer
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Embodiments of the present invention disclose a touch positioning method and apparatus, and a touch screen terminal, where the method includes: recording first track information about moving of a contact point on a touchscreen; determining, from the first track information, second track information that is before a process in which the contact point leaves the touchscreen; and positioning, according to the second track information, a position at which the contact point leaves the touchscreen. In the embodiments of the present invention, a position of a contact point can be accurately positioned according to track information that is before a process in which the contact point leaves a touch screen, so that accuracy of terminal positioning is improved and user experience of a user using a touch screen terminal is enhanced.