Human Machine Interface
Resistance and special features A particular problem can arise as the size or resolution of the displays increases and the pixel size decreases as a result: if the microstructure of the anti-glare matting of a coverglass remains the same, the so-called “sparkling effect” can occur. “Sparkling” is the visual perception of phenomena that appear as glitter or sparkles on the screen. To eliminate the sparkling effect, the microstructure of the etched anti-glare cover glass must be adapted to the high-resolution displays and must not be in the same order of magnitude.
To increase the resistance of HMI operating units, the touch sensor, coverglass and display can be bonded using various optical bonding processes. Bonding enables almost loss-free light transmission and improved readability of the screen content even in a bright environment. At the same time, reflections are also reduced, resulting in an overall more brilliant optical performance of the displayed screen content. Robustness against mechanical effects can also be increased by optical bonding and further enhanced by integrating thermally tempered cover glass instead of untreated glass. In addition,
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thanks to optical bonding, the possible penetration of moisture or contamination into the HMI system can be prevented. For high-resolution HMIs with large diagonals, there are many special features to consider, especially in the area of touch extensions and the associated bonding proficiency. Depending on the application, format or location, the components to be used have a potential influence on the performance as well as the design of the HMI. Touch experts like DATA MODUL have years of experience in optical bonding, offer all bonding methods in-house and also have the necessary expertise in selecting and treating the required cover glasses.
Areas of application and their challenges
Human machine interfaces, as the name suggests, form the bridge between man and machine. Consequently, they can be used wherever interaction is necessary. High-resolution HMIs also pursue the goal of displaying content as precisely, brilliantly and/or in as much detail as possible. Usually, high-resolution HMI systems are used in the digital signage sector to present content in an eye-catching way and at the same time to provide information and
interaction with users. The challenges here are usually to reconcile large diagonals with, for example, readability in sunlight, special housing or design concepts or 24/7 operation. But enhancements such as facial recognition or gesture control are also attracting more and more attention.
The situation is different in medical environments: with MRI/CT or surgical operating units, for example, the focus is on precise and reliable display of high-resolution image data. In addition, there are special requirements such as necessary hygiene and housing concepts, as well as particularly fast data processing. Here, all hardware and software components must be perfectly matched in order to sustainably meet the requirements in this sensitive field of application.
But the need for large diagonals and high-resolution systems is also increasing for conventional industrial HMIs. The level of detail of images and content is constantly increasing, and with it the amount of data to be processed. Modern HMI applications must then not only be able to display content well, but above all have the necessary computing
power to be used efficiently and with high performance.
Summary
The demand for high-resolution HMIs is growing steadily, but with it the demands on the components are also increasing. We are increasingly encountering resolutions up to UHD and diagonals over 80 inches and soon this will increase further. The basis of every HMI unit is always the perfect interaction of display and suitable control. But other factors such as individual design requirements, touch enhancements or even the integration of additional features are increasingly desired and must be taken into account during implementation. The selection of suitable components is not only demanding, but also depends on many parameters that need to be considered in advance. Good advice and comprehensive know-how across the entire component spectrum are particularly useful in the field of high-resolution HMIs. The support of a competent partner is indispensable here, offering advice and assistance right from the start.
www.data-modul.com Components in Electronics May 2023 45
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