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Henkel Adhesive Technologies

Henkel Adhesive Technologies

When a competitive edge is no edge at all

How a disruptive technology is bringing smartphone screens to infinity and beyond.
5 min.

In the fierce smartphone market, the drive for differentiation is pushing device manufacturers to the edge. After nearly two decades of constant design modifications, massive upgrades to camera capability, faster connection speeds, remarkable battery life improvements, and many other added features, the next battlefield in the smartphone (and wearables and tablets, too) market is delivering a bigger, better view. Consumers – especially gamers and video aficionados – want more surface area for their consumption of vibrant graphics. And brand owners are giving it to them.

In late 2024, Apple debuted the iPhone 16 Pro and iPhone 16 Pro Max with a bezel measuring a remarkable 1.41 mm / 1.36 mm. They have company: Oppo’s Find X8 boasts a bezel border of 1.45 mm, and the Xiaomi 15 comes in at 1.38 mm. A few tenths of a millimeter reduction from model to model or brand to brand may not seem like much, but to certain consumers, it is a big deal. It’s also a big deal to make it happen. When considering the design alterations, structural changes, and protection mechanisms required to achieve such minute frames without impacting any of the other necessary hardware, the feat is pretty stunning. 

Not as simple as bigger glass, smaller frame

The bezel, which is the frame of the phone (think picture frame), provides more than structural integrity alone. All the components on the front of the phone are within the confines of the bezel, except for the screen. The frame (bezel) houses essential electronics and cameras. Shrinking the bezel has tremendous impact on the entire smartphone structure, its durability (i.e., drop resistance), performance, and reliability. Plus, the device has certain usability size constraints. It needs to fit in your palm and back pocket, so increasing the overall footprint to allow a bigger screen is out. The only option is to decrease the width of the bezel. But it’s not as easy as reducing the frame size and making the display cover glass bigger. 

Simply put, this is the anatomy of a smartphone: a back cover, a mid-frame, a frame (bezel), a myriad of components, compact camera modules, etc., and the cover glass. To integrate all the functionality, cameras, and electronic packages required for today’s smartphones and reduce the bezel size, design changes are needed. Naturally, every brand owner has a different approach. 

Out with the old, in with the view

Historically, most smartphone designs used a chip-on-glass (COG) approach, where integrated circuits (IC) were attached directly to the surface of the LCD screen. When connected to the flexible printed circuit (FPC), which is wrapped to the underside and connects to the motherboard, this creates a relatively wide ‘chin’ and a larger bezel. 

Moving the IC from the surface of the glass to the FPC in a chip-on-flex (COF) design, the FPC becomes the carrier of the chip and, thus, reduces the space required in the older COG method as the FPC can be folded behind the glass (LED or OLED). This then enables a narrower chin and the shrinking of the protective bezel.  

Finally, for flexible OLED displays, a technique called chip-on-plastic (COP) has emerged to enable a larger screen-to-body ratio. With COP, the chip is placed on a flexible plastic substrate, allowing improved screen module compression. Here, the chin is nearly eliminated to enable the achievement of a full screen.  

The disappearance of the “chin” of mobile phones

With this, smartphones can deliver a full-screen experience. However, to make these next-generation designs possible, a disruptive technology was necessary to balance design and durability. Immersive viewing cannot come at the expense of reliability and performance. 

FDP potting breaks the glass ceiling

To solve the narrow bezel dilemma and accommodate required design modifications, a disruptive protective potting technology has emerged as the most viable approach to device protection for compact form factors. Pioneered by Henkel, flexible display protection (FDP) potting elevates reliability and streamlines processing compared to previous techniques, moving from conventional molded plastics to a sophisticated adhesive solution.

This novel approach to creating a near bezel-less device with an edge-to-edge display has benefits beyond a better view. FDP potting opens new design possibilities, offers a faster, more straightforward process, and delivers outstanding protection and reliability. 

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Excellent protection and reliability

Incredible design possibilities

FDP potting achieves ultra-narrow bezels within compact form factors.

Faster, simplified manufacturing process

The conventional assembly process is reduced to two simple steps (injection and curing), shrinking the end-to-end processing time from 62-122 minutes to 20 minutes per device. A good flow rate, fast UV cure, and easy demolding deliver high throughput, and a more sustainable approach (lower energy consumption and a reduced carbon footprint).

Excellent protection and reliability

FDP potting creates a non-intrusive, robust mechanical structure around sensitive parts, maintains structural integrity to ensure better drop performance.

Together, these material and process capabilities enable new smartphone designs and have also been leveraged for many wearable and tablet devices. It’s a new, borderless frontier in the consumer devices sector and, as usual, the smartphone – enabled by FDP potting – is leading the charge. 

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