Like most things in life, displays change, evolve and, happily, improve. As classic displays and control elements are increasingly being replaced by modern display stacks (Display Touch Cover lens or DTC), naturally new processes will come into play to bond the cover glasses or DTCs into their housings.
As the word ‘stack’ might suggest, various parts of these displays are bonded together. Firstly, the cover glass is bonded over its entire surface with a touch sensor using a transparent adhesive. The cover glass touch unit is then bonded to the display module using the same method.
Either a damping or structural adhesive can be used for the subsequent bonding of the display stack into a frame or housing. Of course, we must add a brief caveat here, as the overall process depends on several factors: the application area, material, DTC design and construction requirements. Because bonding a display stack isn’t always as straightforward as it might seem and there are plenty of considerations and challenges to be taken into account at every stage.
For example, the bonds must be resistant to moisture, grease, chemicals and UV rays. Then, additionally, each material expands and contracts at different rates and the chosen adhesive must be able to compensate for this. This means that judgements must be made in the early stages to decide which kind of bonding is the most appropriate. Simply – it’s all about the pros and cons.
| Double-sided tape bonding | |
|---|---|
| Pros | - ‘Easier’ bonding in the front frame - Fast further processing of the assembly (DTC + front frame) - Cost-effective solution |
| Cons | - Visible gap between front frame and cover glass - Dirt accumulation in the joint |
Well, what do you know, another SimplePlus product has been added to our portfolio! Hot on the heels of the muscular new 7” SimplePlus, we have added a new and pleasingly low-cost 5” display.
When it comes to the world of sensor technology, we like to think that we know our stuff. And while the principles that are central to pressure sensors have been around for some time, we’re certainly seeing a new interest in the latest advancements in the field.
| Liquid adhesive bonding | |
|---|---|
| Pros | - Gap between front frame and cover glass is filled, which contributes to better sealing - Achievable protection class IP6X - Ensures better stability between frame and DCT |
| Cons | - The liquid adhesive takes longer to harden than the tape - The further processing of the assembly takes longer - High effort when dosing and positioning the parts |
|
|
Alexander Sommerfeld - Solution Manager Display Integration, Avnet Displays After getting his diploma in mechatronics, Alexander entered the world of display solutions at MSC in 2006 as a designer for display housings. After a short time, he also took over as team coach for new product manufacturing of open frame display solutions. From 2010, he continued to work as a project developer in the display sector and supported sales and customers with design and integration. In 2013, Alexander took over the planning and completion of the clean rooms and the new display production line. After completion and relocation in 2015, he dedicated himself to the new task of optical bonding processes and specialized in this area. In his current role as Solution Manager Display Integration, Alexander supports the Avnet team and their customers concerning the integration of display products into customer applications and steers and extends the product lines of SimplePlus and MipiPlus display solutions. Read More |
Our Avnet Displays come in a range of form-factors and our display-experts are on hand to guide you in the creation of display or touch solutions that meet your requirements. Find out how Avnet Displays can propel your product innovation and get in touch today.