Oca storage modulus

Why do we need a high T G & modulus for foldable OCA?

The low T g and fixed modulus at operating temperature range are required to foldable OCA, while it secures high adhesion strength to the plastic substrate. Some high T g and functional monomers used for the increase of adhesion strength have a limit to be used because of its high T g and modulus.

What is the difference between foldable Oca and standard OCA?

Compared to standard OCA, the foldable OCA’s low modulus is suitable for foldable equipment, and the improved foldable OCA has the modulus of 10–100 kPa even at high temperatures by preventing modulus decrease at high temperature. The decrease of modulus causes poor adhesion and mechanical durability in high temperature.

Which OCA has a lower storage modulus?

3M CEF35 has a lower storage modulus than that of 3M OCA 8211 and exhibits a more elastic behavior as indicated by its lower tan(delta) value (Table 1) than that of 3M OCA 8211. The simulation was repeated for these two layups bonded either by 3M Foldable OCA CEF3501 or by 3M OCA 8211, both 25 microns thick.

Why is OCA used in flexible display?

Summary In the flexible display, OCA is used for protecting TFT, TFE, and OLED in addition to the existing roles in the flat display. The low T g and fixed modulus at operating temperature range are required to foldable OCA, while it secures high adhesion strength to the plastic substrate.

Why is 3m foldable Oca better than standard OCA?

In reality, the lay-up construction (modulus and thickness of each layer), in addition to assembly (such as tension during the lamination process) of the test specimen or display stack will influence stress profiles. 3M Foldable OCA has a lower modulus over a wide range of operating temperatures, as compared to standard commercial OCAs.

What is the difference between 3 m foldable Oca and 8180 OCA?

The first one is 3 M foldable OCA and has lower modulus and higher elasticity, and the other one is 3 M OCA 8180. The softer OCA, 3 M foldable OCA, contributes less bending stress of display panel and less tensile strain of OLED layer than the other OCA. Also, they show buckling due to residual strain after unfolding.