AR (Anti-Reflection) anti-reflection coating uses destructive interference to counteract surface reflection and is a common technology for camera lenses, spectacle lenses and high-end screens. There are four process routes in the mobile phone film industry, and the effect differences are close to one order of magnitude: chemical immersion is about 3%, electron beam evaporation is about 2%, and magnetron sputtering can be less than 0.5%.
Magnetron sputtering deposits target atoms onto the substrate surface with high-energy ions, resulting in a dense film layer with strong adhesion and good durability - the process basis of Guanfudun reflectivity ≤ 0.5%.
A quick overview of key terms
Destructive interference
Destructive interference refers to the phenomenon where two light waves of opposite phases cancel each other out and their intensity weakens when superimposed. It is the physical principle of AR anti-reflective coating. ... This page focuses on: AR Coating Special Topic: Process, Data and Identification
AR anti-reflective coating
AR (Anti-Reflection) anti-reflection coating is an optical film that reduces surface reflectivity by using destructive interference. It is commonly found in glasses, camera lenses and high-end screen protectors. ... This page focuses on: AR Coating Special Topic: Process, Data and Identification
Magnetron sputtering
Magnetron sputtering is a vacuum coating process: in a vacuum, high-energy ions bombard the target material, depositing the sputtered atoms onto the surface of the substrate to form a dense film. ... This page focuses on: AR Coating Special Topic: Process, Data and Identification
Reflectance
Reflectance is the ratio of the intensity of reflected light on a surface to the intensity of incident light. The typical value of a screen glass surface is about 4%, and it is a core indicator for measuring the "degree of reflection". ... This page focuses on: AR Coating Special Topic: Process, Data and Identification
Wear resistance performance
Wear resistance refers to the retention ability of the surface coating under repeated friction. In the industry, it is commonly quantified by the number of friction times of steel wool/rubber and the attenuation of water droplet Angle. ... This page focuses on: AR Coating Special Topic: Process, Data and Identification
Why does the "built-in anti-reflection" function of a mobile phone fail after applying a regular tempered glass film?
Mobile phone screens (especially OLED screens) have an inherent anti-reflective design inside: by using a circular polarization structure, the ambient light entering cannot return along its original path, thereby reducing the screen's reflection. The prerequisite for this design to take effect is that the reflection occurs after this structure - that is, the screen surface itself.
After the ordinary tempered film is applied, the interface that first reflects the ambient light becomes the outer surface of the film and the interlayer between the film and the screen. Both of these reflections occur before the screen's circularly polarized anti-reflection structure. The screen is of no help, and the film itself does not have an AR coating. As a result, the reflections and glare rebound.
This is the reason why Guanfudun has applied magnetron sputtering AR on the film layer: the reflectivity is ≤0.5% (self-tested by the brand laboratory), allowing the film layer itself to take over the screen to achieve anti-reflection. In combination with the 1/4λ phase delay layer within the membrane, the image seen through the membrane is both less reflective and softer.
Related reading
- What does a 1% decrease in screen reflectivity mean? The quantitative value of AR coating
- Which is better, magnetron sputtering AR coating or chemical immersion AR film? In-depth Analysis of the Process of Eye Protection Tempered Film