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PCAP technology

PCAP technology is based on a capacitive (CAP) principle. The user changes the charge of an electric field created on the surface of the sensor by touching it with one or more of their fingers. These changes are recognised as input by a downstream touch controller. The sensor surfaces are installed behind a glass cover and perfectly protected against damage or wear.

 

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Thanks to its specialised, protected construction, in PCAP technology capacity changes are indirect. This means they are projected through the cover glass (the P in PCAP). (The abbreviation PCT is also used for this type of technology, or projected capacitive touch). The following criteria are some reasons for choosing PCAP technology.

PCAP technology

Advantages:

  • Multi-touch operation possible
  • High transparency
  • Sensors are installed behind the cover glass, creating a closed surface with a “seamless” front.
  • Combined with customer-specific rear printing, these sensors can offer a high-quality design and very easy cleaning.
  • Resistant to water, cleaning agents, and chemicals
  • Dynamically adapt to specific requirements like operation with gloves, ball of the thumb recognition, etc.
  • Dynamic frequency management for harmonised electromagnetic compatibility (EMC)

Disadvantages:

  • Specialised stylus required or can only be operated with prosthesis following adaptation
  • Restricted function at low temperatures
    (if condensation occurs)
  • Sensitive (accidental activation) to strong electromagnetic radiation. (Controller may need to be adjusted, or resistive technology used)

Sensor structures

PCAP technology sensors can be constructed using glass or foil. Both of these typically use a glass cover.

 

Glass sensor

In a glass sensor, the transparent, conductive coating is applied to the front and back sides of a glass carrier
(OGS, one glass solution, high transparency). This indium tin oxide coating is also abbreviated ITO.

 

Successful glass sensor processing since 2014!

 

Advantages:

  • More transparent than PCP on foil base and resistive technology
  • Sensor offers better UV resistance, making it suitable for outdoor use
  • Optical bonding to TFT screen possible


Disadvantages:
(The disadvantages is compensated by the latest equipment)

The glass substrate makes processing more difficult

 

Foil sensor

In foil sensors, a combination of multiple foils coated in ITO serves as the substrate.

 

Advantages:

  • The foil structure is flexible and easier to process                    

Disadvantage:

  • The foil structure is only somewhat UV resistant

 

 

Available sizes for PCAP technology:

4.3 zoll to 65 zoll

Available glasses / glass materials

Richard Wöhr GmbH

 

Enclosures

 

Input systems

 

System technology

 

Mechanics

 

Surface technology