6 Differences between capacitive touch screen vs infrared

Generally, most touchscreens are powered by two main types of technology: infrared (IR) and projected capacitive (PCAP). But how exactly do these display types differ? Here are the differences between capacitive touch screen vs infrared; and take a look at how they may be better suited to the needs of certain industries based on factors like cost and practical applications.

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Difference between capacitive touch screen vs infrared

Workings

For PCAP touch screens, There is a layer of transparent electrode film that is fixed between the LCD panel and the cover glass, when the human finger touches the screen, the current through that film changes, and the signal of the X and Y position will be transferred to the computer.

For IR touch screens, the equipment detects the finger&#;s position by detecting the block of invisible lights from the infrared LEDs that are embedded in the touchscreen frames.

Design

You will frequently see frames in IR touchscreens for broadcasting IR light to the surface area of the overlay, whereas PCAP touchscreens do certainly not demand frames.

In advanced industrial settings, there are generally three common types of touch screens used by OEMs to design a variety of applications- capacitive, resistive and infrared. The capacitive and resistive touch screen types have been in usage for many years, but infrared (IR) touch screens have recently gained momentum in industrial applications with several innovative versions.

An infrared touch screen is designed with an LCD display comprising an IR touch frame mounted around its perimeter. This IR touch frame entails Infrared LEDs and photodetectors along with an optical bezel or protective cover. The IR LEDs emit infrared beams (invisible to the naked eye) through the bezel, creating an optical grid on the display&#;s surface. When a touch event happens, it impedes some of the light beams and photodetectors detect these interruptions. Eventually, the controller identifies the touch point through which beams of the X and Y axis&#; are blocked.

This is how an infrared touch screen work. However, there are many other aspects of IR-infrared touch screens. Read on to learn more.

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Overview of Infrared Touch Screens
Infrared touch screens allow touch operations with a finger or pen. However, the considerable advantage of this touch technology can be better utilized in flat panel displays as the infrared raster matrix on which it works needs to be on the same plane.

Infrared detection technology can take a simple infrared detection system by using the infrared emitter and receiver tube of the same wavelength. If there are objects blocking the connection between the infrared emitter and receiver tubes, the signal will drop sharply at receiving end. Infrared touch screens were not popular when the majority of monitors were using Cathode Ray Tubes (CRT) having a curved surface. Hence, there&#;s a large gap between the real sensing touch plane and the arc-shaped corners in the display screen.

On the other hand, if infrared is used at a much closer distance with flat panel displays, the sensing touch is right at the surface which means there is no false activation particularly in the corners where this was a problem with CRT monitors.

Infrared emitters on the bezel transmit a fixed frequency signal, the receiver only senses this frequency, so the anti-jamming ability is powerful in IR touch screens with pulse mode. In case, the pulse mode modulates the signal on the working frequency, it can be used in applications requiring digital communication, which is commonly known as infrared communication. Remote controls of various household appliances, infrared communication of computers, and even the fastest optical fiber communication is typically designed with this particular technology.

Infrared Touch Screens by A D Metro

A D Metro offers the most innovative version of infrared (IR) touch screens known as Linear Correlating Infrared (LCIR) touch technology. LCIR touch screen is a great choice for applications that require multi-touch operations but face difficulty in integrating PCAP technology. Unlike standard IR technology, A D Metro&#;s LCIR (Infrared) touch screen technology offers reliable two-touch functionality and input compatibility with gloves and a 5mm stylus. Most importantly, it also offers 100% sunlight immunity even with strobing sunlight which standard IR can&#;t achieve. Coupled with optical clarity with maximum contrast and insignificant radio emissions, it is a perfect choice for defense and avionic applications.

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