Account Manager Displays & Systems
Phone: +46 8 531 939 08
Phone: +46 8 531 939 08
Phone: +46 31 458 026
Phone: +46 8 531 939 07
Phone: +46 8 531 939 04
Phone: +45 22 64 50 51
Phone: +358 20 7528 759
Phone: +358 20 7528 736
Phone: +47 23 25 46 14
EG Electronics offers a wide range of touch screen technologies, such as projected capacitive, resistive and infrared, for displays up to 84″.
Our touch screens are widely used in industrial, medical, kiosk, digital signage, monitor, navigation system and gaming industry applications.
Projected Capacitive Touch
Projected Capacitive Touch (PCT or PCAP) technology is a version of Capacitive Touch technology. PCAP Touch is built up by using different conductive materials such as Indium Tin Oxide (ITO) or metallic wires placed in form of a grid in layers on sheets of plastic film. The films are then laminated on the backside of a front glass.
When a voltage is applied to the grid a uniform electrostatic field is created. The electrostatic field reaches through the front glass and when it is interfered by a conductive object such as a human finger or conductive stylus it will be distorted. The distortion can be detected by a controller circuit which will calculate the position.
The front glass can be customized in many ways. For example a screen print can be applied to cover areas outside the active touch area. Other things that can be customized are the shape of the glass, the thickness of the glass, the form of the chamfers, the location of the tails or applying anti-glare treatment or anti-reflexive films to the glass.
For smaller sizes the touch controller often comes as Chip-On-Film (COF) and for larger sizes as a separate printed circuit board.
Resistive touch technology is built up by a bottom glass with two conductive layers on top that are separated by spacers. When a force is applied from a human finger or stylus the two layers are pressed together. This creates a connection between the layers and the resistance is changed which can be determined as coordinate by a controller circuit.
There are more advanced versions of resistive touch screen such as glass-film-glass (GFG) and true-flat frameless touch screens. GFG means that a very thin sheet of glass or heavy duty film is placed on top of the touch screen to increase its resistance against scratches, high temperatures and makes it possible to use chemicals to clean it. A true-flat resistive touch screen is made to look like a PCAP touch
Infrared touch is made up of a frame consisting of LEDs and photodetectors. The LEDs are transmitting IR-light from two of the sides of the frame to create a grid of infrared beams. On the opposite sides of the LEDs there are photodetectors detecting the IR-light. If an object, such as a human finger or any other physical thing, is placed so that it breaks the IR-beam a touch will be detected because some photodetectors will not receive any IR-light. The frame is normally placed on top of the bezel of a display and does not require any front glass.