Straight answers, hedged where honesty requires it. The complete 271-question Chinese FAQ is at woowhead.com/faq.html.
Woowhead is a screen-protector brand owned by Dongguan Runjia Technology Co., Ltd. (Dongguan, Guangdong, China). Its VisionGuard product line — the Guanfudun series — is built around the scinique® dual-guard synergy optical technology.
scinique® is the registered trademark (reg. no. 87730287) of Woowhead's optical technology. Current versions are 1.0 and 2.0 "Dual-Guard Synergy Optical Technology": inward, circular-polarized light conditioning; outward, a magnetron-sputtered AR anti-glare coating.
Dyed filters tint the picture. Woowhead's approach works on the light itself: the film converts the screen's linearly polarized output toward circular polarization, closer to the characteristics of natural light, while the AR coating cuts surface reflection. The picture stays clear instead of getting dark or yellow.
Every box includes a circular-polarized detection card. Place it on the screen and rotate it: the light state changes visibly if the circular-polarized layer is present. The three-step guide is on our verification page.
Transmittance 96.5% and haze 0.4% come from SGS report SZIN2606001469PL01_CN. Surface reflectance ≤0.5% and Mohs 6H hardness are brand-laboratory measurements — sources are labeled on each product page.
Both fit direct-screen (non-curved-display) phones. Choose Guanfudun (2.5D, ¥129) if you use a protective case; choose Guanfudun · Qu (3D hot-bend, ¥189) if you prefer a bare-hand, case-free feel. The decision is about feel, not screen curvature.
The current lineup covers iPhone 16–18 series models and mainstream direct-screen Android models. Check the model list on each Chinese product page, or contact support with your exact model.
The film is engineered to keep full touch response and sensor behavior. If you ever experience an issue, the support team provides 1-on-1 remote video guidance.
No — VisionGuard does not use dyed blue-light filtering. It targets reflection and glare instead. If you need specific blue-light behavior, please contact us before buying.
Yes — the circular-polarized design is designed for better compatibility with polarized sunglasses than linearly polarized solutions.
Unopened items can be returned within 7 days with no reason given, through the purchase platform. Opened items with installation failure are covered by the replacement policy described on the after-sales page.
Currently on mainland-China platforms: JD, Taobao, Douyin, Xiaohongshu, Pinduoduo and the WeChat Mini Store. See the purchase page for store links.
Retail shipping currently goes through the China platforms above. For international distribution or dealer inquiries, email wow@woowhead.com.
No. VisionGuard is a screen accessory designed for viewing comfort by reducing reflections and glare. It is not a medical device and nothing on this site is medical advice.
The brand is operated by Dongguan Runjia Technology Co., Ltd. Its optical structures are covered by a Chinese utility-model patent application (no. 2026207463407, under examination, not yet granted).
Customer support: hello@woowhead.com · Business and dealer inquiries: wow@woowhead.com. Chinese-language help center: /support.html.