What do the 3A cover plates of LCD screens refer to and corresponding functions?
Date:2025-10-22
The "3A cover plate" of a LCD screen refers to a glass cover plate that integrates three processing technologies: AG (anti glare), AR (anti reflection), and AF (anti fingerprint). It is mainly used to enhance the visual experience and durability of display screens. The following table can help you quickly understand their core functions:
Technical Name | Core functionality |
AG (anti glare) | By finely roughening the glass surface, strong specular reflection is transformed into soft diffuse reflection, thereby preventing glare interference and improving visibility under strong light. |
AR (anti reflection) | Using optical coating technology to reduce the light reflectivity of glass surfaces, improve the transparency of screens, and make the colors and details of the images more vivid and clear. |
AF (anti fingerprint) | Cover the glass surface with a nano scale film layer to give it hydrophobic and oleophobic properties, making it difficult for fingerprints and oil stains to adhere and easier to wipe clean. |
Technical principles and synergistic effects
AG (anti glare): Its technical principle is to form countless tiny concave convex structures on the surface of glass. When light shines on this surface, diffuse reflection occurs, dispersing concentrated and glaring light to avoid direct reflection into the human eye and causing discomfort. This is particularly important in outdoor sunlight or indoor strong light environments.
AR (anti reflection): By coating multiple layers of precisely calculated optical thin films (such as a combination of Nb ₂ O ₅ and SiO ₂) on the surface of glass. These film layers utilize the principle of light interference to cancel out the light reflected from the front and rear surfaces of the film layer, thereby fundamentally reducing the reflectivity physically. This not only reduces interference light, but also significantly improves the contrast and color fidelity of the image.
AF (anti fingerprint): Its key technology is to spray a layer of nano coating mainly composed of fluorinated compounds on the surface. This film can significantly reduce the surface energy of the glass, making it have excellent hydrophobicity and oleophobicity like a lotus leaf surface (usually with a water droplet angle ≥ 100 °). In this way, sweat and oil on the hands are difficult to wet and adhere to the surface of the glass.
When these three technologies are integrated onto a cover glass, they can produce a synergistic effect of "1+1+1>3": the AR layer ensures that more light enters your eyes instead of being reflected, the AG layer diffuses residual reflected light that cannot be eliminated into harmless diffused light, and the AF layer ensures that the microstructure and optical film manufactured by the AG and AR layers are always not obscured by oil stains, lasting as new.
Summary and Application
In summary, the 3A cover plate integrates AG, AR, and AF technologies to comprehensively solve the core problems of glare interference, high reflection, and easy fingerprint retention that affect display performance and user experience.
At present, this technology has been widely applied in fields that require high display quality and reliability, such as high-end car displays (such as those adopted by some well-known brand car manufacturers), smartphones, tablets, and other high-end industrial display devices.
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