Touchscreen - QuickField simulation example
This is a simplified model of the capacitive touchscreen, where the capacitance of the finger and human body is replaced by the grounded touch area on the touchscreen surface.
How to find capacitive touchscreen finger coupling model?
Answer Typical applications Geometry
Given
Task
Solution
Results
Due to symmetry you can use a single chart to measure all electrodes currents. Origin x=0, y=0 correspons to the center of the touch screen.
Electric potential is applied to the electrodes in the four corners of the conductive sheet. Conductive object with zero potential boundary touches the sheet and the currents in the electrodes depend on the touch position.
Engineering question
Set up a plane-parallel QuickField DC Conduction problem for a capacitive touchscreen model and evaluate finger coupling from computed field results.
capacitive touchscreens, grounded touch panels, finger sensing surfaces
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Simulation problem
Problem Type
Plane-parallel problem of DC Conduction.
Screen thickness is 0.1 mm
Electrical conductivity of the touchscreen 100 S/m.
A,B,C,D electrodes voltage +1V.
Finger voltage 0V.
Determine the currents in A,B,C,D electrodes as a function of the touchosition.
Different touch positions are simulated by separate models. Creation of the new problems, geometry model modification and results measurements are automated with LabelMover.
Electric field distribution in touch screen.
Video
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