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Views: 286 Author: Kaylee Publish Time: 2023-12-14 Origin: Site
When choosing a touch panel for use in an industrial context, it's important to take the device's reliability and usability into account.
Although there are many different kinds of touch panels available, industrial applications have long relied on analog resistive technologies. Analog resistive devices are not only extremely dependable and rarely require unintended actions, but they can also be used with gloves on.
Because of their high operability and multi-touch capabilities, projected capacitive (PCAP) touch displays, like those seen in smartphones and tablets, are also anticipated to be employed in a wide range of fields. However, because of its sensitivity to noise and difficulties of usage when wearing gloves, such technology has not yet been implemented in industrial domains.
In addition to offering helpful advice for choosing a touch panel to use in an industrial context, the blog that follows explains the characteristics and workings of touch panel systems. The blog also makes predictions on how substantial scientific breakthroughs in electrostatic capacitance will pave the way for future developments in industrial-use touch panels.
The most often used gadgets in the industrial sector are analog resistive touch displays, also known as pressure-sensitive touch panels.
These devices have a straightforward construction: two transparent electrode films are positioned opposite one another, with a tiny space between them. The electrode films come into contact when pressure is applied to the panel, causing current to flow at varying rates based on the key area. The key being pressed is identified by measuring that current.
There are also digital (matrix) resistive touch panels available with two X and Y coordinate pattern layers to help identify the important region coordinates.
Resistive film methods use non-conductive materials for touch responses, while electrostatic capacitance methods use capacitive coupling between the electrodes. This implies that using a finger is not necessary for touch actions. The touch sensor surface is also the most resistant to foreign particles like dust and water droplets when compared to other wavelength-based techniques like infrared (IR), surface acoustic wave (SAW), and others.
However, there are a number of drawbacks, including the inability to do multi-touch operations, low optical transparency, scratch-prone surface, easily worn-out frequently utilized parts, and difficulty producing huge screen sizes.
Since Windows started to enable multi-touch activities, a wide range of LCDs and all-in-one PCs have been introduced.
Infrared LEDs and optical sensors are found in the upper left and right corners of the screen in optical imaging systems. Additionally, the bottom, right, and left sides of the screen are covered in retroreflective sheets. Triangulation is utilized to determine the coordinates of the shadow cast by a finger or other item that touches the screen when it is detected by the optical sensors.
These devices include multi-touch support, glove-friendly touch operations, high transmittance, and durability. It is very simple to expand screen sizes because of the structure.
Though devices are prone to false detections from outside lights and shadows, the bezels must be sufficiently wide to accommodate the light emitters and detectors along the exterior of the screen display area.
One kind of electrostatic capacitance device that was first made available to the general public in the early 2000s was the projected capacitive (PCAP) device.
This approach is commonly utilized in consumer electronics like smartphones and tablets because it offers enhanced functionality over traditional surface capacitive devices. PCAP therefore swiftly took over as the industry standard for touch screens. Surface Capacitive (SCAP)
PCAP devices differ from other devices in that they can perform up to 10-point multi-touch actions and dual-touch turning, zooming, and flipping in the majority of applications.
The electrode film, also known as the ITO (indium tin oxide) layer, in these devices has an electric field produced by a continuous capacitive connection. The capacitive coupling value between the electrodes changes as a finger or other conductive material approaches this layer and generates capacitive coupling between the conductor and the electrode. This change in capacitive coupling is then used to detect the coordinates in the key area.
PCAP displays are frequently utilized in environments where high usage is anticipated, such as ATMs, retail stores, and kiosks, due to their exceptional durability and resistance to scratches. There is also an increase in use in industrial settings. Due to its high transmittance, PCAP screens are a popular option in the medical profession because they provide bright, high-visibility displays.
In the industrial sector, analog resistive touch panels have long been the norm. Surface capacitive (SCAP) devices were previously thought to be suitable for use in industrial settings because of their high reliability, which included a decreased susceptibility to noise and a decreased chance of accidental operations because they could only be operated with bare hands or a specialized stylus. Industrial application, however, proved unfeasible due to the requirement for operability while wearing gloves.
Projection capacitive (PCAP) panels, on the other hand, are extremely susceptible to noise; however, significant advancements in touch panel control technology and noise reduction have mitigated this issue. Enabling glove-free touch operation through the adjustment of the electric field's (or projection area's) size could lead to significant improvements in industrial touch panel technology.
PCAP devices are prone to noise and have a higher chance of inadvertent activities due to their underlying concept. In order to ensure that only legitimate touch events are recognized and prevent accidental operations, frequency hopping—the detection of touch events across different frequency bands—can be used.Kelai tunes industrial equipment for improved quality using a variety of noise countermeasures, including frequency hopping.
Because water can alter capacitance, it can also be a cause of inadvertent touch panel activities. If changes in capacitance particular to water are observed, strategies like frequency hopping can be employed to deactivate critical sections.
Such tuning techniques are being used by Kelai to investigate and create capacitive touch panel computer devices that can be used in wet environments, in addition to drip-proof and waterproof performance.
PCAP devices allow the projection area, or electric field, to be altered for certain uses. For instance, touch operations can be performed while wearing safety or work gloves by adjusting the electric field magnitude and detection distance for touch events based on the thickness and material of the gloves.
