Abstract
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 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°). 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.
Highlights
Sunlight readability is an important issue for mobile displays, whether it is a liquid crystal display (LCD) [1,2] or an organic light-emitting diode (OLED) display [3,4,5]
Mobile display devices are often used in outdoor environments, where strong sunlight reflected by the bare substrate surface would badly wash out the displayed images
The results indicate that the image quality remains excellent, with an image quality index of 97%
Summary
Sunlight readability is an important issue for mobile displays, whether it is a liquid crystal display (LCD) [1,2] or an organic light-emitting diode (OLED) display [3,4,5]. A straightforward method is to boost the display luminance. Bio-inspired moth-eye nanostructures exhibit excellent AR performance, with exceptional broadband wide-angle low reflectivity [12,13,14,15]. We fabricated an AR moth-eye-like structure on a hard-coating thin film spun on a flexible polyethylene terephthalate (PET) and triacetyl cellulose (TAC) substrate for high-ACR flexible display applications. The moth-eye-like nanostructure exhibits an excellent AR property, with luminous reflectance
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