Besides IR touch, resistive touch and capacitive touch in todays market are also mature technology, which performs stably.
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Resistive or capacitive touch screen technology exists even longer than IR touch screens.
But, why do engineers choose IR touch screen for interactive whiteboards, which are widely used for business meetings and distance learning? Here are some benefits of infrared touch screens.
* Economical option compared to other touch screens, the cost of IR touch screens is relatively cheap in large size.
* Better display without other substance between the LCD and overlay, IR touch screens offer the best light transmission, so they can render more vivid images without color and brightness loss.
* Supports multi-touch with windows and android 9.0 double OS, it can support as many as 40 touch-points simultaneously. That means it can support up to 4 students interacting together on an interactive touch display.
* Short response time commonly less than 8ms, IR touch screens localized touch events by detecting light interruption, so they are accurate and quick to respond with actions.
* Better writing experience its overlay is often a piece of tempered glass, and it is smooth to write on it.
* Free of scratches since the LCD monitor is protected by glass overlay, you can rest assured that there will no scratches problems
* More flexible in customizing screen sizes by adjusting the numbers of LEDs and photo-detectors embedded in the overlay frame, you can fit any custom-made monitor with an infrared touch interface
* Maintenance there is no adhesive substance between the monitor and overlay, so you can disassemble the two parts freely by releasing a few screws when doing regular maintenance, such as cleaning the surface, and wiping dust.
* Clear images compared with many camera or projector-based systems, equipment with IR touch screens often adopts backlight LED. So, wherever the lighting environment they perform in, they can provide clear images to the audience.
* 4K resolution they can support 4K resolution screens and work well with high-pixel monitors
* No loss of screen display Since LEDs and sensors are designed to be fixed in the frame that is around the monitor, the screen can display an unrestricted view.
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* Write with any object you can write on an IR touch screen with anything, a bare finger, a gloved finger, wet hands, or a pen, as long as it is not transparent.
* No calibration a traditional smart projector board may require regular calibration to display correct pictures, however, devices with IR touchscreen do not need to calibrate the IR LEDs and sensors to guarantee a normal function.
* No pressure is required to write Resistive touch screen technology perceives the writing track by pressure, which can damage the screen after a long time of usage, while IR touch screen technology by detecting light interruption, so you can write freely without having to push hard on the screen.
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 displays 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.
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, theres 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 Metros 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 cant 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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