An infrared touch screen consists of an LCD monitor, IR touch frame, and an infrared touch overlay.
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Commonly, the overlay is a piece of protective glass hemmed in by the IR touch frame, in which Infrared LEDs and photo-detectors are embedded. A kind of optical bezel will be inserted between the glass and the frame to fix the frame and transmit infrared light emitted by those LEDs.
Through the optical bezel, IR LEDs emit invisible infrared beams forming grids on the surface of the overlay, Photo-detectors are installed across from the LEDs to detect interruptions of beams if touch events on the overlay happen.
The IR touch screen works by detecting interruptions of infrared beams emitted by LEDs embedded in the frame around the touchscreen overlay.
There are two rows of IR LEDs, which generate horizontal and vertical invisible IR beams. They form a large beam grid that covers the surface of the overlay. In the meantime, two rows of photo receptors are installed on the opposite side of the LEDs.
As long as an opaque object touches the surface, it will blot out the light beams. Photo-receptors in both directions (vertical and horizontal) can detect this interruption by that object, finally localize the x and y coordinates, and then send the signal to the processor to respond with relevant action.
Maintenance is a good solution to sustain the equipment with an IR touchscreen, however, it entails cleaning and installing the interface (overlay).
1. First, you need to remove screws from the bracket, which is used to fix the LCD monitor and touchscreen overlay.
2. Second, remove the bracket
3. Third, put the overlay on a flat workbench.
4. Clean the dust inside the sheet metal frame with a canned air duster
5. Clean the inside surface of the glass overlay, by using mild cleaner only, do not use chemical solvents
6. Clean the surface of the monitor
7. with the help of a partner, gently install the overlay back
8. return the bottom bracket to its original position
9. secure the bracket with new screws
Besides IR touch, resistive touch and capacitive touch in today&#;s market are also mature technology, which performs stably.
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
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* 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.
* 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.
Touchscreen technology is used in the majority of modern devices we use today and has revolutionized nearly all industries where a human-machine interface exists. A capacitive touch display developed by Eric Johnson in is commonly regarded as history&#;s first. It was not until the early s however that the touchscreen became widely commercialized. The iPhone&#;s release in marked a major step in the widespread global popularization of touchscreens.
Applications In Military and Aerospace
When the first touchscreen was invented in by Johnson, it was intended to help air traffic controllers interact with their computers more efficiently. The introduction of touchscreens addressed issues with older technology, such as a higher risk of failure, as well as the large amount of space traditional control equipment requires, including many buttons, switches, and a mouse or keyboard. A touchscreen&#;s longer and more stable life eliminates the issue of loose connections and malfunctioning buttons in traditional equipment. Furthermore, touchscreens are more ruggedized than previous technologies to withstand harsh environmental conditions, including high temperatures, low temperatures, and humidity.
Touchscreens allow users to interact with displayed information enabling monitoring of equipment, navigation, and processing of data among other things. They can also facilitate the improvement of combat capabilities through simulation training. Common applications within military and aerospace settings are command and control systems, military vehicles, aircraft and ships, maintenance of military equipment, simulation training, and military medical equipment to name a few.
Types of Touchscreens: Resistive, Capacitivative, Infrared
Capacitive touch screens, the first to be invented, are the most common type of touchscreen used today. They are created by printing a thin layer of conductive metal on the underside of the display&#;s outer surface. An electrical charge is drawn when the screen is touched, becoming the functioning capacitor. Their advanced capabilities make them a modern and advanced touchscreen option, often found in smartphones, tablets, appliances, and monitors. The technology allows for touch gestures, responds to multiple touch points, and is durable with higher-contrast images. Due to the complexity of the manufacturing process, this technology is more expensive.
In the &#;s, after the capacitive touch screen was invented, the first resistive touchscreen was developed. A resistive panel detects pressure on the top layer of the display and sends a signal to the circuit layer. Devices like these consist of two layers separated by a gap, activated by pressure when the layers are touched. Due to their pressure-sensitive nature, these devices can be operated with any input device, such as a gloved hand or a pen, and do not require a conductive item. Resistive devices can be more susceptible to damage and have poorer visibility in direct sunlight than a PCAP in the same arrangement.
In Infrared Touchscreens, the touch functionality is achieved by a series of LED emitters and detectors installed within the touchscreen overlay. Detectors embedded in the touchscreen overlay detect interruptions from infrared beams generated by the infrared LEDs. When an object touches the surface, it blocks the beams, sending a signal to the processor to respond with an action. The advantages of IR touch screens include their vivid images as they do not obstruct the viewing area, multi-touch capability, and short response times. The performance of this technology can be affected by direct light, and its resolution may be lower than that of other types of touchscreens.
Cevians Touchscreen Technologies
A leader in touchscreens specifically engineered for defense and aerospace applications, Cevians offers a broad range of standard and custom touchscreen products. The high-performance touchscreens from Cevians are designed for harsh environments, are sunlight readable, and have a long lifecycle. With a wide operating temperature range of -40 to +80, our touchscreens are MIL-STD-810-approved for military ground and airborne applications.
Contact us to discuss your requirements of custom infrared touch screen. Our experienced sales team can help you identify the options that best suit your needs.