EMI coupling for capacitive touch screens can be a problem which can result in the touch screen assembly being affected by external noise and emissions from the rest of the system.
As well as the system’s power and data processing functions, the display and associated electronics which may also emit EMI.
To address the issues of EMI in capacitive touch panels, display module supplier andersDX is now using customised driver ICs that have EMI specific filter circuits.
Mike Logan, display and input technology manager at andersDX said:
“Engineers understand that EMC needs to be tackled from the ground up. Capacitive touch screens are sensitive to EMI and protection can’t be added as an afterthought.”
These techniques will need to be applied on a case by case basis taking into account multiple factors and in particular the environment and the design of the host product.
“There is no one-size-fits-all solution here. We will work with customers from initial concept right through to qualification, to ensure that the display works reliably in their application, doesn’t interfere with other systems in the environment and complies with the required standards,” said Logan.
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