Large‐Area Writable Textile Display via Parallel‐Aligned Electroluminescent Fibers and Field‐Activated Dielectric Inks

Electronic textiles have emerged as a transformative paradigm in human‐computer interaction due to their unique wearing comfort and multifunctional integration. Textile displays, serving as essential components of electronic textiles, face limitations in widespread adoption owing to bulky driving circuits and complex control systems. Here, a writable textile display is proposed, constructed by weaving parallel‐aligned electroluminescent fibers and utilizing polar dielectric mediums (e.g., hydrogel or deionized water) as field‐activated inks. The electroluminescent fibers exhibit superior light‐emitting performance with a high brightness of 350.2 cd m −2 , high luminance homogeneity (<2.1% deviation across 360° rotation over 6‐meter length), and remarkable stability under mechanical deformations. By eliminating external control modules, this design enables direct writing through spatially defined polarization of dielectric mediums. A scalable textile display (30 cm × 200 cm) with sharp patterns (micrometer‐scale resolution) is demonstrated, which are fully erasable and rewritable without performance degradation. The system shows exceptional environmental robustness, maintaining 98.8% luminance after 100 000 friction cycles, 30 industrial washes, and 7‐day thermal cycling (4 °C to 95 °C). Integrated with capacitive sensing arrays, the textile enables real‐time interactive applications in smart wearables and canvases, functioning as an effective platform for everyday communications and artistic expression.