Splitting of the mechanical neutral plane is a promising concept for foldable displays because it reduces the folding stress in each layer of the display. We verified the splitting concept experimentally and revealed a linear relation between the relative position of the neutral plane and the logarithm of the adhesive's elastic modulus. As the modulus decreased, the position of the neutral plane approached that of perfect splitting. On the basis of the neutral‐plane splitting concept, we developed 5.5‐inch full high‐definition foldable active matrix organic light‐emitting diode (AMOLED) displays, which endured 150 k inward folding cycles and 150 k outward folding cycles with folding radii of 3 and 5 mm, respectively. This study is expected to improve the flexibility of designing foldable AMOLED displays, enabling better balance of the portability versus practicality trade‐off in mobile displays.

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Flicker and image persistence are major issues for low frequency driving. The photo leakage current in an outdoor light environment causes further image quality deterioration. We developed 7.0-inch WUXGA (1200×RGBW×1920) reflective fullcolor LCD, equipped with light-shielding metal layer which suppress photo leakage current, driven by LTPS TFT at 1Hz.