Touchscreen - QuickField simulation example
Currents at the four corner electrodes of a capacitive touchscreen versus touch position, showing the electrical signals used to determine contact location.
How to calculate the four corner-electrode currents as a function of touch position in this touchscreen 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
Simulate each grounded touch position in a plane-parallel DC-conduction model and calculate the currents at electrodes A, B, C, and D.
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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