New antireflective coating makes screen reading in sunlight easier
The moth-eye-like nanostructure was fabricated by an imprinting process onto a flexible substrate with a thin hard-coating film.
Inspired by nature
The proposed nanostructure exhibits excellent antireflection (AR) with luminous reflectance < 0.23% and haze below 1% with indistinguishable image quality deterioration. A rigorous numerical model is developed to simulate and optimise the optical behaviours. Excellent agreement between the experiment and simulation is obtained. Meanwhile, the nanostructure shows robust mechanical characteristics (pencil hardness > 3 H), which is favourable for touch panels. A small bending radius (8 mm) was also demonstrated, which makes the proposed nanostructure applicable for flexible displays.
Additionally, a fluoroalkyl coating was applied onto the moth-eye-like surface to improve the hydrophobicity (with a water contact angle > 100°). Such a self-cleaning feature helps protect touch panels from dust and fingerprints. The proposed moth-eye-like AR film is expected to find widespread applications for sunlight readable flexible and curved displays.
The study is published in: Optica, Vol. 4, Issue 7, 2017