Monday, 1 October 2018

PCAP Touch Displays - Overcoming The Challenges



Touchscreens are rapidly becoming the prevalent technology for any interaction between human and machine. The push in the last decade has come from projected capacitive (PCAP) touchscreens being rapidly adopted in a range of sectors.

An example of these are sectors are:

  • Industrial
  • Medical
  • Security
  • Vending
  • Point of Sale 

PCAP Development

To develop a PCAP touchscreen for a wide range of applications and environments, it requires complete understanding of the individual components. Examples of the components are; the cover lens material, touch sensor or any modular shortcut capacitive keys.

The first consideration should always be who will be using the touchscreen. How will they be using it and where? This will then drive the selection of the individual components and how they will work together.



The Challenges

Consideration needs to be given to how the following challenges will be overcome during the process.

Multi touch use: how will the touch display be used? Do all ten fingers need to be recognised or is this less?

EMC requirements: where will the machine be used and what are the electromagnetic compatibility standards required? This is very important in some areas such as a hospital critical care unit or in some military equipment. EMI in the environment is also an important factor as electrical interference can produce false “ghost” touches if not factored into the selection of components and tuning of the controller firmware. This can be critical in environments with lots of machines operating such as a factory.

Water, condensation and steam: both water and steam can produce ghost actuations on a PCAP screen. With the complete knowledge of the firmware in the PCAP controller, the system can be made to identify and ignore the presence or water, steam and condensation.

>> Read more on Touch Technologies in the Great Outdoors

Will the machine operators be using gloves: if known at the initial stages, the PCAP design can be specifically designed to operate perfectly for a variety of gloves.

Could this machine be subject to vandalism: a PCAP touchscreen can be ruggedised to perform in harsh environments such as door access, ATM or ticket machines. An increased thickness of chemically strengthened or toughened glass can be used to withstand situations where machines may be subject to deliberate vandalism.



The SCHURTER Solution

Only a manufacturer with in-depth knowledge gained from working with the individual components of the touchscreen can produce the correct design and product for complex modern environments. 

SCHURTER has been designing and producing touch solutions for over 40 years and with its supreme knowledge, skills and experience in capacitive solutions, we are the partner of choice for some of the most prominent European manufacturers of machines in a multitude of markets.

To find out more on our touch display solutions visit our website. Alternatively you can email our team for to arrange a FREE consultation.