The cover glass, also known as the front glass or cover lens, is the component of the display system with which a user interacts through direct contact.
It has a variety of tasks:
Since the introduction of PCAP technology, the cover glass has been of particular importance, as this touch technology is the first to separate function (touch sensor) from design (cover glass).
Designed as safety glass or tempered glass, it resists attacks on the surface or is destroyed in a defined manner (breaking into small, blunt pieces).
The surface is part of the look of the overall system and is coated as anti-glare or anti-reflective depending on the requirements and environment. Other functions such as anti-fingerprint or a coating to kill germs are also possible. For special applications in medical and food technology, a plastic replaces the glass material.
As the cover glass is larger than the outer dimensions of the display, the edge can be graphically designed. This starts with a simple black print and extends to icons and company logos. Sensors, e.g. for brightness and presence, can simply be hidden behind the cover glass. Different processes (screen printing, ceramic printing, digital printing) each have advantages and disadvantages and must be selected depending on the application. The printing is always done on the back of the cover glass, so that wear and tear due to abrasion is not relevant.
The processing options for the cover glass also allow non-rectangular contours and openings, e.g. for an emergency stop button.
If a touch sensor made of foil is used, it is glued to the back of the cover glass. The entire structure is in turn bonded to the display behind it. Methods for this are "tape bonding", in which double-sided adhesive tape is used, and "optical bonding", which is described in more detail below.
In many cases, the individual features can also be combined with each other, and customized cuts in all possible sizes are possible.
The white paper highlights topics such as components, application areas, advantages and challenges of optical bonding and explains in detail the individual bonding processes for display and touch. (This Whitepaper is in german.)
Especially during the winter months and in the current situation, protection against bacteria on touchscreens is essential. With the Antibacterial Glasses we have the ideal solution for medical monitors or terminals in the public sector such as ticket machines or elevator controls.
Our Antibacterial Glass makes colonization by bacteria much more difficult. In the tests carried out so far, none of the bacterial species applied on a trial basis were able to settle on the glass.
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