I want to build a model of a projective capacitive touchscreen using hardware you can find at school. I read about different geometries of ITO-lines. For my purposes I think that thin lines of aluminium foil can replace the ITO-layers.
The model should provide a realistic view on real mutual capacitive touchscreens. Therefore I wonder how the ITO-lines are run by electricity. I understood, that it works with AC-current which make sense due to the fact that the resistance of capacitors depends on the AC-frequency.
Does anybody know what frequencies are normally used for touchpanels?
My second question: How are the lines and rows of ITO connected to the powersupply? Is it right, that all the lines are connected to the same powersupply and that the rows are only run by current, which is caused by the elektric field form the lines?
Thank you very much for your answers.
If anybody knows someone who already built a model for capacitive touchscreens I would be very thankful for an adress!
Greetings
Lennart Mühlfeld
The model should provide a realistic view on real mutual capacitive touchscreens. Therefore I wonder how the ITO-lines are run by electricity. I understood, that it works with AC-current which make sense due to the fact that the resistance of capacitors depends on the AC-frequency.
Does anybody know what frequencies are normally used for touchpanels?
My second question: How are the lines and rows of ITO connected to the powersupply? Is it right, that all the lines are connected to the same powersupply and that the rows are only run by current, which is caused by the elektric field form the lines?
Thank you very much for your answers.
If anybody knows someone who already built a model for capacitive touchscreens I would be very thankful for an adress!
Greetings
Lennart Mühlfeld
