Industrial touch displays are commonly used in both commercial and industrial settings for various applications and it’s likely you’ve interreacted with one already today. They are commonly used in kiosks for self-service terminals, making processes easier and reducing waiting times. Point-of-sale terminals in retail stores and restaurants also use touch screens for faster transactions and reduced errors. In industrial settings, touch screens are also used in factory floor human-machine interfaces, allowing operators to control and monitor industrial processes.
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The available touch technologies for industrial settings are resistive touch, capacitive touch, infrared touch, and projected capacitive touch. Each technology has its own strengths and suitability for different industrial applications. The choice of touch technology depends on factors such as the specific requirements of the application, the environmental conditions, and the desired level of interactivity and durability.
With various touch technologies available how do you know which touch technology is right for your application? Before choosing your next industrial touchscreen monitor there are a couple of operational and environmental factors to consider to get the best performance and longest operation time in the field. You should consider the type of application, the environment in which the industrial touch monitor is being deployed, and the required performance of the HMI you are designing. A few important questions are listed below and shortly followed by the advantages and disadvantages of each touch technology which will help you decide which is best suited for your application.
What display size is suitable for your application?
How will the operator use the touch display? Finger, glove or alternative object?
What is the frequency of operation?
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Will the touchscreen be deployed indoors or outdoors? Will the display need to be high bright or sunlight readable?
What are the required operating conditions? Will the touchscreen be exposed to bad weather or possible contamination?
Will the touchscreen be at risk of vandalism?
Well know in the industry, resistive touch technology was the most widely used touch technology. The resistive touch sensor is composed of a flexible transparent plastic front screen and rear glass or transparent panel with each layer having the inside surfaces covered in a thin metallic coating. The coating is typically made of Indium Tin Oxide and one layer will have a small measured charge applied. A slim air-gap, formed by minuscule glass beads, separates the plastic front display and the back glass. When the user interacts with the front display using their fingers or any solid item, the two metal layers beneath the point of contact connect, leading to an electrical current. Upon touch, a variation in voltage is identified. The touch controller connected then calculates and triangulates the activation point. With the resistive touch display being prone to damage once hit with force or scored into, these are best suited for well maintained, low cost, and low usage applications. With negligible electromagnetic interference these displays are suitable for military and medical applications.
Contrary to the majority of touch technologies, Infrared or “IR” touch screens don’t necessitate a touch-detecting overlay on the front of the display. They employ IR transmitters and receivers housed in a frame, typically made of plastic, which is affixed to the display bezel. This framework generates an unseen barrier or lattice of light rays across the display, from one side to the other and from the top to the bottom. When an object disrupts the infrared barrier, the touch controller identifies the touch location based on the X-Y coordinates of the disrupted signal. Occasionally, a safeguarding glass or plastic shield is positioned over the screen to avert any harm to the delicate LCD surface caused by touches.
Infrared touch technology is best suited for monitored and properly managed indoor uses where a large or cost-effective touchscreen is needed and the risk of frame impairment or pollution is minimal. Infrared touch technology is not ideal for outdoor use because its touch functionality can be significantly impacted by environmental light and weather circumstances.
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