Olhos de mariposas inspiram nova tecnologia antirreflexo: mas o design não é mera ilusão na natureza?

quinta-feira, junho 22, 2017

Broadband antireflection film with moth-eye-like structure for flexible display applications

Guanjun Tan, Jiun-Haw Lee, Yi-Hsin Lan, Mao-Kuo Wei, Lung-Han Peng, I-Chun Cheng, and Shin-Tson Wu

Optica Vol. 4, Issue 7, pp. 678-683 (2017) 

Source/Fonte: Inside Science


Sunlight readability is a critical requirement for display devices, especially for mobile displays. Anti-reflection (AR) films can greatly improve sunlight readability by reducing the surface reflection. In this work, we demonstrate a broadband moth-eye-like AR surface on a flexible substrate, intended for flexible display applications. The moth-eye-like nanostructure was fabricated by an imprinting process onto a flexible substrate with a thin hard-coating film. The proposed nanostructure exhibits excellent AR with luminous reflectance <0 .23="" class="GINGER_SOFTWARE_mark" ginger_software_uiphraseguid="51ca75b9-c963-4ac2-a642-2dcd81316c92" gs="" id="352f64d0-7f8e-46ec-8b8c-c89f6aa8567d">%<0 .23="" gs="">% and haze below 1% with indistinguishable image quality deterioration. A rigorous numerical model is developed to simulate and optimize the optical behaviors. Excellent agreement between the experiment and simulation is obtained. Meanwhile, the nanostructure shows robust mechanical characteristics (pencil hardness >3  H>3  H), which is favorable 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°>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.

© 2017 Optical Society of America