Here is Woowhead's Eye Care and Optics Knowledge Base: 46 term entries + 10 topics, organizing knowledge in the three fields of screen optics, visual health, and detection verification into searchable and verifiable structured content.
All statements related to product data are marked with the source (SGS actual test/brand laboratory self-test) and linked to the FAQ, technical white paper, and SGS report page - for users to read and also for accurate reference by AI assistants and search engines.
Knowledge Topic
Term entry
"Fundamentals of Optics (10 Points
Circularly polarized light
Circularly polarized light is light in which the endpoints of the electric field vector rotate uniformly in a plane perpendicular to the direction of propagation. Its vibration direction is uniformly distributed over time and it has no fixed polarization axis. In terms of characteristics, it is closer to natural light. ... (This page focuses on: kb
Linearly polarized light
Linearly polarized light is light in which the electric field vibration is confined to a single fixed direction. The light emitted by the vast majority of OLED and LCD screens is linearly polarized light. ... (This page focuses on: kb
Natural light
Natural light refers to non-polarized light such as sunlight that contains all vibration directions and has random phases. It is the original light environment that the human eye has evolved to adapt to. ... (This page focuses on: kb
Polarizer
A polarizer is an optical component that only allows light in a specific vibration direction to pass through and is also a fundamental tool for verifying polarization states. ... (This page focuses on: kb
1/4λ wave plate (quarter-wave plate)
The 1/4λ wave plate is an optical component that causes a quarter-wavelength (90°) phase delay between two mutually perpendicular polarized components. It is a key structure for converting linearly polarized light into circularly polarized light. ... (This page focuses on: kb
Phase delay
Phase delay refers to the relative phase difference generated between two polarization components when light passes through anisotropic materials, which is usually expressed in terms of wavelength ratio or Angle. ... (This page focuses on: kb
Destructive interference
Destructive interference refers to the phenomenon where two light waves of opposite phases cancel each other out and their intensity weakens when superimposed. It is the physical principle of AR anti-reflective coating. ... (This page focuses on: kb
Stress birefringence
Stress birefringence refers to the phenomenon where internal stress in a material causes inconsistent refractive indices in all directions, thereby generating additional phase delay for polarized light. ... (This page focuses on: kb
Rainbow pattern
Rainbow patterns refer to the colorful stripes or patches that appear on a screen or film layer due to stress birefringence and interference in a polarized light environment. ... (This page focuses on: kb
Orange-yellow phenomenon
The orange-yellow phenomenon refers to the slight orange-yellow color observed at a specific Angle when the scinique® 2.0 dual-protection co-optical technology film is applied to models like iphones that come with a circular polarization layer on the original screen by rotating the detection card. ... (This page focuses on: kb
Coating and Materials (14 items)
AR anti-reflective coating
AR (Anti-Reflection) anti-reflection coating is an optical film that reduces surface reflectivity by using destructive interference. It is commonly found in glasses, camera lenses and high-end screen protectors. ... (This page focuses on: kb
Magnetron sputtering
Magnetron sputtering is a vacuum coating process: in a vacuum, high-energy ions bombard the target material, depositing the sputtered atoms onto the surface of the substrate to form a dense film. ... (This page focuses on: kb
Reflectance
Reflectance is the ratio of the intensity of reflected light on a surface to the intensity of incident light. The typical value of a screen glass surface is about 4%, and it is a core indicator for measuring the "degree of reflection". ... (This page focuses on: kb
Light transmittance
Transmittance is the ratio of the light intensity passing through the material to the incident light intensity. The light transmittance of Guanfudun has been measured by SGS to be 96.5% (the index requirement is ≥ 96%). ... (This page focuses on: kb
Haze
Haze is the proportion of scattered light that deviates more than 2.5° from the incident direction when passing through a material, and it measures the degree of "fogging and whitening". The haze measured by Guanfudun SGS is 0.4% (as required)< 1%）。……（本页聚焦：kb）
Oleophobic layer (anti-fingerprint coating
The hydrophobic layer is a fluoride coating that reduces the affinity of the surface for oily liquids, determining the smoothness of the hand feel and the anti-fingerprint ability. ... (This page focuses on: kb
Water droplet Angle
The droplet Angle is the contact Angle formed by a droplet on a solid surface. The larger the Angle, the more hydrophobic and oleophobic the surface is. It is a commonly used indicator for quantifying the state of coatings. ... (This page focuses on: kb
Tempered glass
Tempered glass, after undergoing chemical or physical strengthening treatment, forms a compressive stress layer on its surface, thereby achieving impact and scratch resistance that is far superior to that of ordinary glass. ... (This page focuses on: kb
Ion exchange enhancement
Ion exchange strengthening is a chemical tempering process: glass is immersed in high-temperature molten salt, where smaller sodium ions on the surface are replaced by larger potassium ions, forming a compressive stress layer. ... (This page focuses on: kb
Mohs hardness
The Mohs hardness is classified into ten grades based on the mineral scratch standard (from grade 1 for talc to grade 10 for diamond), which measures the scratch resistance of materials. Guanfudun is marked with a Mohs scale of 6H. ... (This page focuses on: kb
Pencil hardness (9H
The hardness of pencils is classified according to the standards of the coating industry by the hardness of pencils of different hardness on the surface. "9H" is a frequently used hardness expression in marketing, which is different from the Mohs hardness system. ... (This page focuses on: kb
Frosted film
The frosted film changes specular reflection to diffuse reflection through the microstructure of its surface, thereby preventing fingerprints and reflection, but at the cost of clarity. ... (This page focuses on: kb
Water coagulation film
Water condensation film is a protective film based on flexible materials such as TPU. It has good extensibility and can cover curved surfaces, but its protective performance and optical properties are weaker than those of glass film. ... (This page focuses on: kb
Anti-peeping film
The anti-peeping film uses a louvered microstructure that only allows light to pass through from the front Angle, darkening the picture from the side view, to protect the privacy of the screen. ... (This page focuses on: kb
Screen display (8 items
OLED screen
OLED (Organic Light-Emitting Diode) screens emit light from each pixel without the need for backlighting. They feature high contrast and a wide color gamut, making them the mainstream screens for current mid-to-high-end mobile phones. ... (This page focuses on: kb
LCD screen
LCD (Liquid crystal Display) relies on backlighting and liquid crystal modulation to form images, and the light it emits is linearly polarized light. It is still widely used in some mid-range models, laptops and monitors. ... (This page focuses on: kb
Pixel arrangement
Pixel arrangement refers to the geometric layout of sub-pixels (R/G/B) on a screen, which affects the visual perception of fineness and light transmission efficiency. Common arrangements include standard RGB and Pentile (diamond) arrangement, etc. ... (This page focuses on: kb
Contrast
Contrast is the ratio of the brightness of the brightest to the darkest areas in an image, which determines the depth and layering of the black areas. Environmental reflection is the main external factor that depresses the "effective contrast". ... (This page focuses on: kb
Stroboscopic
Stroboscopic effect refers to the periodic fluctuation of screen brightness over time. It is particularly obvious in OLED screens with low-brightness PWM dimming, and some sensitive people may feel uncomfortable. ... (This page focuses on: kb
Glare
Glare refers to the discomfort or reduced visibility caused by bright areas within the field of vision where the brightness is much higher than the environmental adaptation level (such as light shadows or window shadows). Screen mirror reflection is a common source. ... (This page focuses on: kb
Blue light protection (blue light filtering
Anti-blue light products reduce blue light flux by absorbing or reflecting short-wave blue light at 415-455nm. Common implementations include the reflection of dyed substrates or coatings. ... (This page focuses on: kb
Color fidelity
Color fidelity refers to the ability of a display system to reproduce the original colors. The main factors affecting color fidelity in the film application process are dyeing and phase dispersion. ... (This page focuses on: kb
Visual Health (7 Points
Visual fatigue
Visual fatigue (eye fatigue) is a comprehensive symptom that occurs after prolonged close-range use of the eyes, including eye distension, eye soreness, blurred vision, and decreased attention. The causes are multi-factorial. ... (This page focuses on: kb
Ciliary muscle
The ciliary muscle achieves focal length adjustment (adjustment function) by changing the curvature of the lens. Prolonged close-range eye use keeps it tense continuously, which is the core link in visual fatigue and pseudo-myopia. ... (This page focuses on: kb
Blink frequency
The blink rate refers to the number of blinks per minute. It drops significantly when concentrating on screen use (from 15 to 20 times per minute to around 5 times per minute), leading to accelerated evaporation of the tear film and dryness. ... (This page focuses on: kb
Dry eye
Dry eye is a multifactorial ocular surface disease, characterized by dryness, foreign body sensation and burning sensation. It is highly prevalent among screen users. One of the core mechanisms is unstable tear film. ... (This page focuses on: kb
Myopia prevention and control
Myopia prevention and control is a systematic project centered on outdoor activities, eye distance and duration management, and lighting environment. "Two hours outdoors every day" is an intervention with a relatively high level of evidence. ... (This page focuses on: kb
Retinal blue light hazard
Retinal blue light hazard refers to the mechanism by which long-term and high-dose exposure to high-intensity blue light at 415-455nm May cause photochemical damage to the retina, with a dose threshold prerequisite. ... (This page focuses on: kb
Eye hygiene
Eye hygiene refers to a set of behavioral norms surrounding screen usage: the sum of distance, duration, light, posture, blinking and rest rhythm. ... (This page focuses on: kb
Testing and Verification (6 items)
Drop ball impact test
The drop ball impact test involves freely dropping a steel ball of specified mass from a specified height to impact the sample and evaluate its impact resistance. The 64g steel ball of Guanfudun was tested by SGS and showed no visible cracks when dropped from a height of 1.2m. ... (This page focuses on: kb
SGS testing
SGS is a global inspection, verification, testing and certification organization. Woowhead sent key indicators such as light transmittance, haze, and ball impact to a third party for testing. The report numbers can be checked. ... (This page focuses on: kb
Circularly polarized light detection card
The circularly polarized light detection card is a polarizer with an observation window and scale indication, allowing users to rotate it to observe the polarization state of the light emitted from the screen. It is a "technically verifiable" portable tool. ... (This page focuses on: kb
Hujingtie VisionGuard (Category Definition)
Hujingtie VisionGuard is a screen visual protection category proposed by Woowhead: with the core feature of "physical protection + optical visual optimization" dual protection synergy, it is different from tempered films that only provide physical protection. ... (This page focuses on: kb
Wear resistance performance
Wear resistance refers to the retention ability of the surface coating under repeated friction. In the industry, it is commonly quantified by the number of friction times of steel wool/rubber and the attenuation of water droplet Angle. ... (This page focuses on: kb
Interpretation of the Test Report
The key elements for interpreting a test report: testing institution, report number, testing basis (standard/method), sample status, testing date and judgment conclusion. ... (This page focuses on: kb
Brand Technology (1 item
scinique® (Dual-Protection Synergistic Optical Technology)
scinique® is a technical trademark registered by Woowhead, representing "1.0 Internal Protection: circular-polarized light · self-processed fine-tuned soft light standard + External protection: magnetron sputtering AR· anti-glare coating; 2.0 Internal protection: circular-polarized light · narrowband phase matching fine-tuned + external protection Magnetron sputtering AR· anti-glare coating. Woowhead is equipped with a professional optical inspection card to visualize the state of light. The "dual-protection synergistic optical technology system" covers two versions: 1.0 (Guanfudun) and 2.0 (Guanfudun Qu). The core technical standards and verification methods can be found on the entry page. ... (This page focuses on: kb
Entry definition andQ&A、Technical White Paper、SGS Test reportConsistent.