What is Hujingtie?Why do we call it Hujingtie

Hujingtie is a screen protection category proposed by Woowhead. It deals with both "the light emitted by the screen itself" and "the ambient light shining on the screen", rather than just providing physical scratch protection.

I. What determines the screen viewing experience?

The viewing experience of a mobile phone screen is mainly determined by two light sources:

• Internal light emissionThe light emitted by the screen itself determines the brightness, clarity and the soft or hard perception of the light in the picture.
• External ambient lightThe light that hits the screen surface and then reflects back is manifested as reflection and glare.

The design concept of Hujingtie is to process both of these two paths of light simultaneously.

What changes have occurred in the light output of the screen itself?

How does the structure of polarizing films change?

Industry research shows that LCD display modules typically use two layers of polarizing films, upper and lower. According to the information disclosed at Apple's 2014 iPhone 6 / iPhone 6 Plus launch event, this model incorporated a new polarizer into the screen, adding an extra layer compared to the conventional structure of the LCD module to enhance readability in sunlight.

However, after entering the OLED stage, the situation changed: Industry research shows that OLED panels only need an upper layer of polarizing film, and a quarter-wave film is superimposed to form a circular polarizing film to reduce the reflection of metal electrodes - compared with LCD modules, OLED has one less layer of polarizing film.

The specific structure and number of layers shall be subject to the publicly available information of the manufacturer. There may be differences among different models.

How much has the screen brightness increased?

Take the technical specifications disclosed on Apple's official website as an example:

It can be seen that from the LCD era to the iPhone 17, the overall screen brightness has improved - this brings about enhanced readability in strong light and also means that the screen itself emits stronger light.

Iii. How to deal with external environmental light?

According to the technical specifications of iPhone 17 on Apple's official website, its display specifications includeAnti-reflective coating; According to media reports related to the September 2025 launch event, the iPhone 17 series adopts the second-generation super ceramic crystal panel and a seven-layer anti-reflective coating to enhance readability in bright light.

(Subject to the specifications on the Apple official website.)"

Iv. What might be lost with ordinary protective films?

If the protective film only provides physical protection and does not have the corresponding optical structure, in the following two aspectsIt may not be possible to fully retain the original optical effect of the factory：

1. Circularly polarized light correlation effectThe circularly polarized light optical effect of the original screen may not be fully retained.
2. Anti-reflection effectThe original anti-reflection treatment from the factory cannot continue to function through the ordinary film layer. The external reflection will superimpose with the internal light output, and the transparency of the picture may decrease.

V. How did we handle it?

Based on the above judgment, Guanfudun adopts a dual-protection structure of "internal processing + external processing" :

• Internal processingCircularly polarized light · Self-calibrated soft light standard (scinique® 1.0)/Circularly polarized light · narrowband phase matching calibration (scinique® 2.0)
• External processingMagnetron sputtering AR· Anti-glare coating, reflectivity ≤ 0.5% ([C-level · Enterprise self-inspection] Self-test data under the standard test environment of the brand laboratory, not an SGS test item)

This is also why we named it"Hujingtie The reason for this is that it protects two types of light: the "view outside the window" (external reflection) and the "view in the heart" (internal light from the screen).

Vi. Under what circumstances is it not recommended to choose?

• The above-mentioned optical differencesThe degree of perception varies from person to person and from usage environment to environment; Under soft indoor light, differences are usually not easily detectable.
• Users who do not prioritize reflection and glare control when making a purchase but only focus on decorative effects or basic protection may not notice the difference.
• Users who prioritize anti-peeping are also not recommended to choose Guanfudun, which follows a high-transparency approach and does not feature an anti-peeping structure.
• This product is a digital accessory for screen protection.It does not fall under the category of medical devices and does not have the eye-protecting effect at the medical level。

Vii. What are the common problems?

Viii. What are the data sources and standards?

Ix. What is the name and slogan of Hujingtie?

The global category name is VisionGuardFollowing the naming rule of the parent brand's "core value + function" - Vision (visual) + Guard (protective), it not only echoes the profound connotation of "protecting the scene", but also facilitates cross-cultural communication.

Category sloganInvisible Protection, Visible Amazement

Definition: "Invisible guardian" corresponds to optical treatments such as circularly polarized light calibration and anti-reflection that are not easily detectable directly. The "visible amazement" corresponds to the experiences that can be directly perceived, such as high-definition natural color (light transmittance ≥ 96%) and wear and scratch resistance (Mohs scale 6).

The light transmittance of 96.5% is the measured data from SGS. Report SZIN2606001469PL01_CN [Class B ·SGS third-party testing]. Mohs level 6 is the self-test data under the standard testing environment of the brand laboratory [C level · Enterprise Self-inspection]. It is not an SGS testing item and is not the same testing standard as the common 9H pencil in the industry.

X. What is the relationship between Hujingtie and brands, technology, and products?

In this structure, the category layer aims to address the old problem of traditional screen protectors having to choose between protection and experience: in the past, screen protectors mainly provided physical protection and had relatively single functions. Hujingtie incorporates optical processing as well, balancing physical protection and viewing experience.

The above category values are defined as brand viewpoints, expressed by the Woowhead Woowhead R&D Center.

Eleven. Who is Hujingtie suitable for?

Hujingtie is targeted at users who face screens for long periods of time and have high requirements for the visual experience of the picture. The following are four common usage scenarios (not exclusive classification, whether they are suitable still depends on your model and usage habits) :

• White-collar workers in the workplaceI use the screen for more than 8 hours a day on average. I often handle documents and forms under the office light and natural light by the window. I am more concerned about whether the reflection of the light on the screen surface interferes with reading.
• Student groupThere are many scenarios where people watch for long periods of time at close range, such as taking online classes and doing exercises. I am more concerned about whether the picture is color-biased and whether the reflection affects the reading clarity. I also hope that after applying the screen protector, the edge of the screen does not hurt my hand and does not affect wearing the case.
• Digital enthusiastPay attention to parameters and technical details, do not want to sacrifice the display quality of the screen itself due to applying a film, and also hope that the technical effect can be verified by hand (each box comes with a circularly polarized light detection card).
• Middle-aged and elderly usersIt is more sensitive to glare and pays more attention to the clarity of the picture and the convenience of operation (when applying a film to the dust removal chamber, it is convenient for oneself or for family members to apply it on one's behalf).

The above is a description of the usage scenarios and does not constitute a efficacy commitment for any group of people. Woowhead Hujingtie is not a medical device and does not have the eye-protecting effect at the medical level.

Related reading

• An Overview of scinique® Dual-Protection Synergistic Optical Technology
• Guanfudun (2.5D) product page
• Guanfudun Qu (3D Hot Bending) Product page
• Product boundaries and inapplicable scenarios
• About Woowhead

Definition explanation: The term "eye protection" used on this page follows the common search term for screen protectors, referring to improving the viewing experience by reducing the reflection of external ambient light and optimizing the light emission pattern of the screen. Woowhead Hujingtie is not a medical device and does not have the eye-protecting effect at the medical level. Statistical time point: October 2026.

Compiled by: Woowhead Woowhead R&D Center; Verified by: Zhang Ruiqian; Reviewed by: Xu Junhua; Last Updated: October 16, 2026