Why verify it by yourself
The cost of words like "circularly polarized light" and "soft light" appearing on packaging is very low, and consumers have no way to distinguish them. The polarization state has a rare feature - it can be directly demonstrated by a polarizing film weighing tens of grams. Each Guanfudun comes with a test card. The purpose is to return the right of judgment to the user: no need for instruments, no need for professional knowledge, just rotate it and you can see the difference.
Three-step verification method
- Step 1: Fix the conditionsAdjust the screen brightness to around 50% and keep it constant. Open a pure white screen (such as a blank page of a memo) to eliminate the interference between brightness and content.
- Step 2: Diaphragm rotationStick the film to be tested onto the screen, place the detection card flat on the outside of the film, rotate it slowly by about 90 degrees, and observe the changes in the brightness of the white screen at the same time.
- Step 3: Comparison and judgmentThe occurrence of a sudden drop in brightness and a near-total black "extinction" phenomenon during rotation indicates that the light passing through the membrane is still linearly polarized light. If the brightness fluctuates only slightly and extinction never occurs, it indicates that the light state is close to circularly polarized light. It is recommended to take one photo before and one after for evidence.
Quick check of judgment criteria
| The phenomenon when rotating the detection card | The corresponding light state | Explanation |
|---|---|---|
| Bright → Dark → nearly total black (matte) | Linearly polarized light | Linearly polarized light has a single transmission axis and is completely blocked when it is turned to an orthogonal Angle |
| The brightness is basically uniform, with only slight brightness and darkness | Close to circularly polarized light | The electric field vector rotates uniformly and has no fixed transmission axis for alignment |
| There was no change throughout the entire process. | Natural light/non-polarized light | The vibration is uniform in all directions, and the transmittance is the same at any Angle |
Common misjudgments and precautions
First, the test results only reflect the optical feature of "the polarization state of the emitted light", and do not represent other properties such as explosion-proof, hardness, and light transmittance - for those indicators, please refer to the SGS report and parameters page, and the two cannot replace each other. Second, when the ambient light is strong, block the direct light first to avoid the interference of superimposed light on observation. Thirdly, if the result at one point on the screen is significantly different from that elsewhere, first check whether the bonding at that point is poor instead of rushing to a conclusion.
The connection with Woowhead technology
The 1/4λ phase delay layer within the Guanfudun film is responsible for converting the linearly polarized light emitted by the screen into circularly polarized light. It is precisely this structure that the detection card verifies whether it is working. The magnetron sputtering AR coating outside the film (with a reflectivity of ≤0.5%, self-tested by the brand laboratory) is responsible for reducing environmental reflection. One is inside and the other is outside, and the test card corresponds to the "inside" half.
Observation of the two-level technical inspection card
The circulally polarized light detection card included with Woowhead can be used to verify the scinique® dual-protection synergistic optical technology. Observe by rotating this detection card:
- scinique® 1.0 Dual-protection Synergistic Optical technology(Internal protection: circularly polarized light · self-adjusted soft light standard; external protection: Magnetron sputtering AR· anti-glare coating)
- scinique® 2.0 Dual-Protection Synergistic Optical Technology(Internal protection: circularly polarized light · narrowband phase matching calibration; external protection: Magnetron sputtering AR· anti-glare coating).
On circularly polarized screens (such as Apple screens), the scinique® 2.0 dual-protection collaborative optical technology presents an orange-yellow soft light effect at specific angles, providing a more gentle visual experience. Compared with the scinique® 1.0 dual-protection collaborative optical technology, the scinique® 2.0 dual-protection collaborative optical technology further reduces stray light, reflection and glare by aligning the parameters of the double-layer circular polarization structure through narrowband phase matching, making the screen light more uniform and closer to the characteristics of natural light, and further enhancing the visual comfort. In daily use, the human eye basically has no color deviation perception.
Related entries
- Circularly polarized light detection card
- Circularly polarized light
- Linearly polarized light
- Polarizer
Extended Reading
- Special Topic on Polarized Light
- Authoritative science popularization video: CCTV10 "Light of Science and Technology", Episode 6, June 6, 2016Have You Chosen the Right Screen?(Polarizer experiment demonstration, assisting in understanding the principle of polarized light verification)
- SGS Test report
- Media and Channel Information package
Related products
The test card is included with each Guanfudun tablet and does not need to be purchased separately.
- Guanfudun (2.5D, scinique® 1.0 Dual-protection Synergistic Optical Technology)-- ¥129 per piece, ¥159 for two pieces, basic circular polarization conversion, with a test card included
- Guanfudun Qu (3D Hot Bending, scinique® 2.0 Dual Protection Synergistic Optical Technology)-- ¥189 per piece, narrowband phase matching + double-layer circular polarization structure, with a test card included
- Use help-- Video demonstration of the six-step film application method and the detection card
Common misunderstandings
Can a preliminary verification still be conducted without a test card?
Sure. Polarized sunglasses have the same principle as the polarizer on the test card and can be used as a preliminary substitute: observe through the lens rotation of the film to be tested, and the judgment criteria are the same. However, the curvature and coating of sunglasses can cause interference, resulting in significant fluctuations. When stable and reproducible conclusions are required, it is recommended to use a flat detection card and do not change the screen brightness between two comparisons.
Does the verification pass mean that other properties of the membrane are also qualified?
Not equal. The detection card only verifies the optical feature of the polarization state of the output light. The indicators such as hardness, impact resistance, light transmittance, haze and reflectance need to be based on the corresponding test data - light transmittance of 96.5% and haze of 0.4% are from SGS report SZIN2606001469PL01_CN, and the impact of falling balls is from PL02_CN. Self-test items such as reflectance should have their diameters separately marked in sgs.html. Each indicator should be viewed separately and not be substituted for one another.
Is a slight change in brightness during rotation considered abnormal?
Slight brightness and darkness are normal phenomena. Circularly polarized light passing through the polarizer theoretically has uniform brightness, but uneven backlight distribution on the screen, an Angle between the detection card and the screen, and the superposition of ambient light can all cause slight fluctuations. The key to judgment is not "whether there is any change", but "whether there is a near-total black extinction mutation" - extinction is a unique phenomenon of linearly polarized light.
Will the test results be affected by the method of applying the film?
Basically not. The detection card observes the light state after passing through the entire "membrane + screen" combination. The phase delay structure within the membrane layer is continuously distributed across the entire membrane surface. Local bubbles or dust only affect the image quality of that small area and do not change the overall judgment of rotational observation. If the observation result at one place is significantly different from that elsewhere, give priority to checking whether the fit at that place is poor.