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Home/Tech/TrendForce: Viscoelastic glue hides crease in Apple's foldable iPhone
VERIFIEDBy Xavier Rivera· ·1 min read

TrendForce: Viscoelastic glue hides crease in Apple's foldable iPhone

TrendForce credits a special hi-tech glue with enabling an invisible crease on Apple's expected foldable iPhone. This breakthrough overcomes a major hurdle that delayed the device and positions Apple to grab significant foldable market share.

Source:9to5Mac
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TrendForce: Viscoelastic glue hides crease in Apple's foldable iPhone
TL;DRAI · 60 sec read

TrendForce identifies viscoelastic optically clear adhesive (OCA) as key to hiding the crease on Apple's upcoming foldable iPhone. The glue stays soft during bends to cut stress fatigue and stiffens under impacts. Apple rejected Samsung prototypes for visible creases, then optimized neutral layer positioning, stress distribution, and variable-thickness glass per patents. OCA stabilizes layers and cuts light scattering. TrendForce projects 20% foldable market share for Apple this year.

TrendForce analysts pinpoint an advanced optically clear adhesive (OCA) as pivotal to Apple's near-invisible crease on its upcoming foldable iPhone. The glue's viscoelastic properties allow it to remain soft during bends, reducing fatigue stress, while stiffening under impacts for added support.

Apple rejected multiple Samsung display prototypes over visible creases, stemming from neutral layer misalignment in the panel stack. Designers addressed this last year through precise stress distribution, optimized neutral layer positioning, and variable-thickness ultra-thin glass—thinner at the fold axis, thicker elsewhere for durability, as detailed in Apple patents.

The OCA further stabilizes the neutral layer and fills microscopic gaps, minimizing light scattering that highlights creases. TrendForce notes these combined innovations enable Apple's entry into foldables. The firm projects Apple capturing 20% of the foldable smartphone market this year, according to reports citing the analysts.
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