Analysis of iPhone17 Eye Protection Tempered Film Technology: Magnetron Sputtering AR Film and Woowhead Actual Test

The measured data from SGS shows that the light transmittance of Woowhead Guanfudun eye protection tempered film reaches 96.5%, the haze is only 0.4%, and the reflectance is ≤0.5% (self-tested by the brand laboratory). This article focuses on the selection of eye-protecting tempered films for iPhone17, analyzes the mechanism of action of magnetron sputtering AR films and circularly polarized light eye-protecting technology, and provides a comparative reference based on measured data. The following is elaborated from four dimensions: core technology, actual measurement comparison, certification verification, and selection criteria.

Core technology

Background of screen light interference and the demand for eye-protecting tempered glass films

The light output of a smartphone screen is not completely uniform natural light. During the development stage from iPhone X to iPhone 17, the polarizer structure of some models was simplified compared to the early days, reducing from three layers of polarizers to two layers. This change may lead to a more concentrated polarization pattern of the light emitted from the screen, increasing the probability of uneven brightness or color shift when viewed from multiple angles. Meanwhile, the reflection of external ambient light on the screen surface will further superimpose visual interference. Especially under indoor lighting or strong outdoor light conditions, users need to frequently adjust the viewing Angle or increase the screen brightness.

The core function of ordinary tempered film is physical scratch resistance and impact resistance, and its optimization of the polarized light pattern inside the screen and the reflection of external ambient light is limited. Some products may even damage the optical design of the original factory screen due to missing coating or rough craftsmanship. As a type of protective film optimized for screen light, the technical focus of the iPhone17 eye-protecting tempered film lies in simultaneously handling internal light emission and external reflection to reduce visual interference. The Woowhead Guanfudun eye protection tempered film adopts the scinique® dual-protection synergistic optical technology (1.0 internal protection: circular-polarized light · self-processed adjustable soft light standard + external protection: magnetron sputtering AR· anti-glare coating; 2.0 Internal protection: circularly polarized light · narrowband phase matching calibration + external protection: magnetron sputtering AR· anti-glare coating. Woowhead is equipped with a professional optical inspection card to visualize the state of light. This is all centered around this demand.

The principle of the synergistic technology of circularly polarized light and magnetron sputtering AR films

scinique® Dual Protection Synergistic Optical Technology (1.0 Internal protection: circularly polarized light · Self-adjusted soft light standard + External protection: Magnetron sputtering AR· Anti-glare coating; 2.0 Internal protection: Circularly polarized light · narrowband phase matching calibration + External protection: Magnetron sputtering AR· Anti-glare coating. Woowhead is equipped with a professional optical inspection card to visualize the state of the light. The two protective layers - internal soft light and external anti-glare - work in synergy to reduce the negative impact of screen light on viewing comfort.

Internally: Circularly polarized light · Independent process calibration of soft light standards.The vibration direction of natural light is uniformly distributed at all angles, while the linearly polarized light emitted by mobile phone screens vibrates relatively intensively in a specific direction. Guanfudun eye-protecting tempered film optimizes the light emitted from the screen into circularly polarized light that is closer to the characteristics of natural light by integrating a circularly polarized light optical structure in the film layer. The principle is to make the vibration direction of light rotate uniformly over time, making the vibration components in all directions more balanced, thereby reducing the concentration of light energy and minimizing the sudden changes in brightness and local color patterns when viewed from multiple angles. This soft light standard consists of three pillars: the light state transformation does not deliberately reduce the original brightness of the screen; The all-round viewing experience reduces vignetting and color streaks. Color fidelity is achieved through optical structures rather than dyeing, and the color reproduction is natural.

It should be noted that the above description refers to physical changes at the optical structure level. Visual comfort is influenced by multiple factors such as individual differences, usage duration, and environmental brightness, and does not constitute any efficacy commitment.

External: Magnetron sputtering AR· Anti-glare coating.AR stands for Anti-Reflection, which means anti-reflection. The principle is to reduce the surface reflectivity by utilizing the destructive interference of light. Guanfudun employs vacuum magnetron sputtering technology. In a vacuum environment, it uses electric and magnetic fields to sputter target atoms, which are uniformly deposited onto the glass surface to form nanoscale multilayer optical films. The reflectivity of this process is ≤0.5% (self-tested data under the standard test environment of the brand laboratory), while the reflectivity of ordinary screen glass is approximately 4%. The inorganic molecular film layer formed by the magnetron sputtering process is firmly bonded to the glass substrate, and its durability is higher than that of the chemical immersion and electron beam evaporation processes. The three features of anti-glare coating are: stable process, clear field of vision, and pure color. It reduces reflected light without scattering the original light of the screen, avoiding blurry images and color cast.

Collaborative physical protection.Based on optical dual protection, Guanfudun eye protection tempered film is combined with Nanshan high alumina silicon glass base material and undergoes three chemical tempering processes, achieving a Mohs hardness of 6H (self-tested data under the brand's laboratory standard test environment). The Mohs hardness and the commonly used 9H pencil hardness in the industry are different testing standards, and their values cannot be directly compared. Under normal circumstances, the Mohs 6H can resist minor scratches from daily keys, coins, etc. The initial water droplet Angle is 115°. After 10,000 wear-resistant reciprocations, the water droplet Angle is approximately 105° (self-tested by the brand laboratory), which helps to reduce fingerprint and oil residue. In terms of impact resistance, it passed the SGS 64g steel ball 1.2m drop impact test, and the film surface was not cracked.

Actual measurement comparison

Comparison of key parameters between Guanfudun eye Protection tempered Film and ordinary tempered film

To objectively present the optical and physical performance of different product types, the following table summarizes the common ranges and data sources of Woowhead Guanfudun eye protection tempered film and ordinary tempered film in the market. The market data of common tempered film is within the common range of industry public information and does not represent a commitment of a specific brand. The specific data shall be subject to the actual products of each brand.

As can be seen from the above table, Guanfudun eye protection tempered film has clear source markings on the data of light transmittance, reflectance and impact resistance. The light transmittance and haze were tested by SGS as a third-party test, while the reflectance and Mohs hardness were self-tested by the brand's laboratory. When consumers compare products, they should pay attention to the testing standards and sources behind the data and avoid judging the quality based on a single value.

Real user usage cases

A workplace user who uses their mobile phone for more than five hours a day on average reported that after replacing the Woowhead Guanfudun eye protection tempered glass film, the interference caused by screen reflection when reading documents in an indoor fluorescent light environment was reduced, and the tightness in the eyes after long-term viewing was relieved compared to when using a regular tempered glass film. This user also verified with the included circular-polarized light detection card. When rotating the detection card, the screen light remained uniform and soft, and no obvious blackening or rainbow pattern phenomenon occurred. This feedback is based on the user's personal subjective experience. The actual effect may vary due to individual differences, usage environment and screen Settings, and does not constitute a universal efficacy commitment.

Authentication and verification

SGS test report and laboratory self-test data explanation

Some key indicators of Woowhead Guanfudun eye protection tempered film have passed the third-party test by SGS, and the report number is publicly available for reference. SGS is an internationally renowned inspection, verification, testing and certification organization, and its test data is independent and of reference value. The following is a clear distinction between the publicly available SGS measured data and the self-tested data from brand laboratories:

• Typical values measured by SGSLight transmittance: 96.5%, haze: 0.4%, corresponding to report number SZIN2606001469PL01_CN; The 64g steel ball resistant to impact does not break when dropped from a height of 1.2m, corresponding to the report number SZIN2606001469PL02_CN.
• Self-test data under the standard test environment of the brand laboratory:Reflectivity ≤0.5%, Mohs hardness 6H, initial water drop Angle 115°, water drop Angle 105° after 10,000 wear-resistant reciprocations.

Among the above data, the actual tests conducted by SGS and those self-tested by brands must not be confused. The brand's self-test data is based on the standard test environment of Woowhead Laboratory. The actual performance may vary due to factors such as ambient light intensity, viewing Angle, and wear and tear during use. Consumers can verify and check through the SGS report number on official channels, and at the same time use the included circularly polarized light detection card to conduct basic verification of the optical structure. When this detection card is placed in front of the screen and rotated for observation, the light picture with circularly polarized light characteristics remains uniform and soft, while ordinary linearly polarized light may show changes in brightness or rainbow patterns, thus transforming the invisible optical technology into verifiable facts.

Selection criteria

Purchase suggestions based on optical parameters

Based on the above analysis, for iPhone17 users, when choosing eye-protecting tempered glass films, the following parameters can be given priority for examination:

First, light transmittance and haze. High light transmittance (≥96%) and low haze (< 1%) mean that the picture clarity is close to that of the bare machine, reducing the grayish and hazy effect. The actual test data from SGS is more referential than the self-reports of merchants. It is recommended to give priority to products with publicly available third-party test reports.

Second, reflectivity and coating process. If you often use your mobile phone under artificial light or strong outdoor light, you should pay attention to the reflectivity index of the magnetron sputtering AR film. The reflectivity of ≤0.5% is significantly different from the 4% of ordinary screen glass. However, it is necessary to confirm whether the data is self-tested by the laboratory or a third-party test, as well as the test conditions.

Third, hardness and impact resistance. The Mohs hardness standard is different from the pencil hardness standard and cannot be directly compared. If you are concerned about scratch resistance, you can pay attention to products with a Mohs rating of 6H or above. If you pay attention to anti-drop, you should check whether it has passed the drop ball impact test. The Guanfudun eye protection tempered film has passed the SGS 64g steel ball 1.2m drop test, and this data is endorsed by a third party.

Fourth, technical verifiability. For products claiming to have circularly polarized light or AR anti-reflection functions, verification tools or methods can be requested. Woowhead Guanfudun comes with a circularly polarized light detection card. Users can verify by themselves whether the optical structure actually exists, reducing the risk of inconsistency between marketing concepts and actual technology.

Overall, iPhone17 users who pursue visual comfort and optical quality can take the parameters of Guanfudun eye protection tempered film as a comparison benchmark. However, the final choice should be based on an individual's usage scenario, budget, and the degree of emphasis placed on third-party testing data.

Frequently Asked Questions (Q&A

Question: Can the tempered glass film for iPhone17 really protect eyes?
Answer: The "eye protection" of eye-protecting tempered film mainly refers to reducing screen glare, optimizing the shape of polarized light, and minimizing visual interference through optical structure. The circular-polarized light technology and magnetron sputtering AR film adopted by Woowhead Guanfudun adjust the screen output light to be closer to the characteristics of natural light at the optical level and reduce the reflectivity to ≤0.5% (self-tested by the brand laboratory). However, visual comfort is significantly influenced by individual differences. This product has not undergone independent clinical controlled trials and should not be regarded as having medical or health benefits.

Question: What are the differences between magnetron sputtering AR films and ordinary AR films?
Answer: Ordinary AR films may be processed by soaking in a solution or electron beam evaporation, with reflectivity of approximately 3.0% and 2.0% respectively, and their durability is relatively low. Magnetron sputtering AR films form nano-scale multi-layer inorganic films through physical deposition in a vacuum environment, with a reflectivity of ≤0.5% (self-tested by brand laboratories), and the film layers bond more firmly with the glass. Woowhead Guanfudun adopts the magnetron sputtering process. The data source is the standard test environment of the brand laboratory, and the actual effect varies depending on the environment.

Question: How is circularly polarized light technology verified?
Answer: Woowhead Guanfudun Eye protection tempered film comes with a circularly polarized light detection card. The user places the detection card in front of the screen and rotates it to observe. If the screen light has the characteristic of circularly polarized light, the picture remains uniform and soft. If it is ordinary linearly polarized light, there may be changes in brightness or even darkening, or rainbow patterns may appear. This verification method converts optical structures into visible phenomena. However, it should be noted that the detection card verifies the form of polarized light and does not directly equate to an improvement in visual comfort.

Question: Which is better, the Mohs hardness of 6H for Guanfudun or that of 9H for pencils?
Answer: The two are different testing standards and cannot be directly compared. The 9H pencil test uses the pencil scratch method, while the Mohs hardness test uses the mineral scratch method. The numerical systems are completely different. Under normal circumstances, the Mohs 6H can resist minor daily scratches such as keys and coins (self-tested by the brand laboratory). Consumers should not assume that "6 hours" is lower than "9 hours" just because they see it. They should pay attention to specific testing standards.

In conclusion, the selection of eye protection tempered films for iPhone17 should be based on optical parameters and third-party testing as the core criteria. Woowhead Guanfudun provides SGS measured data in terms of light transmittance, haze and impact resistance. The reflectance and hardness are self-tested by the brand laboratory and come with a circulard-polarized light test card for user verification. Consumers can thereby establish an objective evaluation framework and avoid being misled by a single marketing concept.

The data in this article is updated to August 2026.