Overcoming Limitations of Traditional Infrared Touch ...

Earlier resistive and capacitive touch screens had a strong foothold in the touch screen market. However, as the demand for touch applications spurred, more technologies have been introduced to streamline the production process with all kinds of needs. Infrared (IR) touch screens are one of those technologies that become an excellent alternative for applications where capacitive or resistive touch technology doesn&#;t fit right.

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What is IR-Infrared Touch Screen Technology?
An infrared touch screen is composed of an LCD monitor and an IR touch frame. The touch frame outfitted with LEDs and photodetectors, consists of an optical bezel or protective cover that enables LEDs to emit infrared beams but are invisible to the naked eye. This process creates an optical grid on the display&#;s surface, and during the touch event, it blocks some of the light beams, allowing photodetectors to detect these interruptions.

Given their reliability, accuracy, and durability, IR-Infrared Touch Screens are used for a variety of interactive applications, including retail, gaming, healthcare, and manufacturing. However, the traditional IR touch sensor technology also has a few limitations.

Limitations of Infrared Touch Screens

Susceptibility to from Bright Light Interference:
Ambient light can cause problems with infrared touch screens. Touch detection can be hampered by strong sources of infrared light, such as strobing sunlight or bright interior illumination.

Restricted Touch Detection in Some Conditions:
When a user operates a touch application using a stylus which is too narrow to interrupt light beams, the screen may become inactive. Styluses must be wide enough to break at least one of the light beams to trigger a touch event.

Power Consumption is Higher Than Other Touch Technologies:
Traditional infrared touch screens require more power than other touch screen technologies, such as capacitive or resistive. The demand for continuous infrared light emission quire often requires a more robust power supply.

Overcoming These Limitations with A D Metro&#;s LCIR Touch Technology:
Considering these limitations and challenges of using traditional infrared touch screens, A D Metro has engineered an advanced IR touch sensor known as linear correlating infrared (LCIR) touch technology. A D Metro&#;s patented linear correlating infrared (LCIR) touch technology delivers highly responsive, precise, glove-compatible, two-touch, zero-force operation.

The LCIR design improves over traditional infrared touch systems in several ways. Traditional infrared touch systems include rectangular sensor frames, LEDs, and photodetectors, optionally enclosed by a bezel or cover which also includes the controller interface. Whereas LCIR touch systems consist of a sensor frame and a separate external controller board. This makes the touch frame very compact and easy to integrate into most displays where other makes are quite large with restricting frame heights and widths which can make integration a challenge. Also, LCIR does not use a glass substrate panel to mount the optics frame onto to keep narrow beam optics used in standard IR optically aligned. Such a glass panel can interfere with the clarity and transmissivity of the display. If the display has contrast enhancements applied, this glass panel will greatly diminish the effectiveness of such enhancements like anti-reflective films or circular polarizers and produce a lot of reflectance and reduce transmissivity.

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The linear correlation technology does not look at just one light beam at a time but look at a group of 5 simultaneously as the groups progress across each plane of the screen. This allows for wider beam optics and negates the need for a glass panel to keep narrow beam optics aligned so there is nothing between the user&#;s eyes and the display itself. This type of touch detection also provides complete ambient light immunity no matter if it&#;s strong sunlight or strobing light or both. The LCIR design provides two-touch performance by employing optical scans at different angles across the touch sensing area &#; ideal for pinch, zoom, and rotate actions.

The revolutionary LCIR solution from A D Metro is an excellent alternative for applications that demand multi-touch functionality but struggle to integrate projected capacitive (PCAP) touch sensors because of their operational limitations. Even in harsh settings like high radio frequency interference (RFI) and full sunlight interference, LCIR technology provides:

• 100% optical clarity/maximum contrast due to the absence of a substrate layer;
• 100% sunlight immunity, including strobing sunlight;
• Reliable two-touch functionality;
• Compatible with Gloved fingers and 5mm stylus touch input.

Conclusion:
A D Metro&#;s patented LCIR touch technology helps improve the usability of traditional IR-infrared touch screens for a variety of interactive applications. Most importantly, the LCIR touch screens are an excellent solution for defense, automotive, aviation, and medical applications and all markets where ultra-reliable touch screen function is critical.

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.

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.

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