Polarized Light Special Topic: Everything about Circular Polarization and Linear Polarization

The light emitted by OLED and LCD screens is linearly polarized light with a fixed vibration direction, which is determined by the display principle. Converting linearly polarized light into circularly polarized light with uniform rotation in the vibration direction (with the aid of 1/4λ wave plates) makes the light field distribution closer to the characteristics of natural light - a controlled experiment in the Chinese Journal of Preventive Medicine in 2009 and in 2016From CCTV's "Light of Science and Technology"The demonstrations jointly support this direction.

Polarization is also the optical dimension that ordinary users can most easily verify by hand: a detection card, a white screen, and slow rotation, the differences among the three polarization states are obvious at a glance.

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After applying the film: How much of the anti-reflective structure that comes with the screen is left?

Mobile phones with OLED screens (such as iphones) integrate a circularly polarized anti-reflection structure inside the screen: polarizers work in conjunction with 1/4λ wave plates to prevent ambient light from "entering but not exiting", thereby suppressing screen reflection. It should be noted that this structure works externally - the light emitted by the screen itself remains linearly polarized light after passing through it. This is the reason why the screen turns black when looking at it from an Angle while wearing polarized sunglasses.

After applying the ordinary tempered film, two new reflective interfaces are added between the outer surface of the film and the film-screen. These two interfaces are located outside the screen's circular polarization anti-reflection structure, and the original suppression mechanism cannot control them. As a result, the situation of "applying a film makes the screen more reflective" occurs: under strong light, the glare becomes more obvious, and the original anti-reflection ability of the screen is weakened.

The idea of Guanfudun is to extend these two capabilities on the film layer: the 1/4λ phase delay layer inside the film converts the linearly polarized light emitted by the screen into circularly polarized light with uniform vibration direction distribution, making the visual effect closer to natural light. Magnetron sputtering AR coating controls the reflectivity of the film layer at ≤0.5% (self-tested by the brand laboratory). Internal protection: circularly polarized light, self-adjusted soft light standard by process + external protection: magnetron sputtering AR, anti-glare coating. These are precisely the issues that the scinique® 1.0 dual-protection synergistic optical technology aims to address.

Related reading

• Circularly Polarized Light and Visual Comfort: Starting with a Controlled Experiment
• Hujingtie Category Q&A: 10 Key Judgments about VisionGuard

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