Conferences and supporting programme
Capacitve Touchscreen Technology for Industrial and Automotive Applications
Capacitive Touchscreen driver IC's are currently based on technology which was developed for consumer electronics applications, in particular for use in mobile handsets and tablet PC's. In some cases these IC's have been been re-purposed with some success for use in more challenging applications such as industrial and automotive market segments but there remain many difficulties in developing end user products which meet all of the requirements which OEM's expect to be met for a successful design-in with no compromises. One of the principal difficulties when designing for non-consumer products is meeting the requirements for stable operation under conditions of high electrical noise; many existing devices try to meet the requirement by increasing the drive voltage and while this has met with some success, there are severe side effects related to emissions and reduced lifetime of sensors when this approach is used. The adoption of force sensing and haptic feedback in systems, particularly in the case of automotive applications is becoming increasingly common and while it is simple in principle to make the force measurements and to drive the haptic actuators, there remain many practical difficulties from both an electronic system point of view, where achieving an acceptable latency is difficult and where the implementation of a suitable mechanical system which is reliable remains elusive. There is also an increasing desire to enhance the way the user interacts with touch surfaces and for the aesthetics of the way they are implemented - this can lead to the need for non-uniform stack-ups and even air gaps in the structure, both of which are very difficult to deal with using existing driver IC's. In this paper we will describe a new approach to touchscreen technology which takes the 'wish-list' of the HMI designer and implements some new methodologies to make the capacitive measurements and to enhance the way they are post processed to overcome the limitations of existing IC's. We will discuss solutions to achieving the lowest latency haptic feedback, triggered by integrated force sensing and will describe the importance and methodologies of achieving a high signal-to-noise-ratio while maintaining a low drive voltage. Finally we will explain how non-uniform thickness touch surfaces can be realised without compromising touch performance.
--- Date: 27.02.2019 Time: 1:15 PM - 1:35 PM Location: Conference Counter NCC Ost