Out‐of‐Plane Strain‐Decoupled Architecture for High‐Fill‐Factor Stretchable OLED Displays

ABSTRACT Stretchable organic light‐emitting diode (SOLED) displays require both high pixel fill factors and large mechanical deformability, yet these requirements intrinsically compete in conventional coplanar island–bridge architectures. Here, a vertically decoupled multilayer SOLED architecture is introduced in which emissive pixel islands and deformable electrode interconnects are separated into distinct functional planes. This configuration alleviates planar area competition while redistributing applied deformation into the vertically separated interconnect layers and low‐modulus elastomeric regions, thereby suppressing strain transfer to the rigid emissive islands. The resulting passive‐matrix SOLED achieves an areal fill factor of ∼75% while sustaining uniaxial strains exceeding 50%. Finite element analysis shows that the island‐region strain remains below 1.5% under 20% applied panel strain, consistent with stable electroluminescent operation during deformation. A 3 × 3 passive‐matrix array maintains uniform pixel emission under 30% biaxial strain. In addition, a transparent parylene‐C/Al 2 O 3 –SiO 2 nanolaminate hybrid encapsulation exhibits a water vapor transmission rate of 9.17 × 10 − 6 g m − 2 day − 1 and an average visible transmittance of 91.78%, extending the operational LT 60 from ∼75 to ∼195 h. This vertically decoupled design provides an architectural route to mitigate the conventional fill‐factor–stretchability trade‐off while enabling mechanically robust and environmentally reliable stretchable OLED displays.