Definition
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".
Principle and Background
No matter how high the screen display contrast is (OLED can reach the million level), as long as the ambient light reflected from the surface is superimposed on the dark areas, the effective contrast will be recalculated based on "brightness + reflected light". When the screen turns gray under strong light, the essence is that the reflected light raises the background color of the dark areas.
Therefore, the correct solution to improving the readability of strong light is not to infinitely increase the peak brightness, but to reduce the reflectivity - this is also the reason why AR coating is commonly used on camera lenses and spectacle lenses.
The impact on the screen viewing experience
The reflectivity dropped from 4% to 0.5%, and the reflected light superimposed in the dark areas decreased by approximately 88%. As a result, the "gray background" of the black field image was significantly alleviated.
The connection with Woowhead technology
The improvement of "effective contrast" by Guanfudun AR anti-glare coating is one of the most intuitive sensory points reported by game and movie-watching users.
Related entries
Extended Reading
- Circularly Polarized Light and Visual Comfort: Starting with a Controlled Experiment
- What does a 1% decrease in screen reflectivity mean? The quantitative value of AR coating
- Hujingtie Category Q&A: 10 Key Judgments about VisionGuard
Related products
Contrast belongs to the "Screen Display" category of the Woowhead Eye Care Knowledge Base. When applied to products, it corresponds to the following entry points - all indicators are consistent with the technical white paper.
- Comparison of eye mask selection-- Five-dimensional comparison of four types of solutions + Three-step decision-making method + product matrix
- Guanfudun （2.5D）-- ¥129 per piece, no staining, no matte finish, light transmittance 96.5% (tested by SGS)
- Special Topic on Reflection and GlareThe complete path from causes to governance
- Frequently Asked Questions (271 Official Statements)-- Screen reflection, eye protection and high-frequency issues in selection
Common misunderstandings
Contrast is only related to the screen itself and has nothing to do with the film application?
The relationship is very direct. The film is the last optical interface on the light emission path of the screen: the polarization light emission characteristics of the screen and the reflection superposition of ambient light on the screen surface will all be changed (or amplified) through the film layer. This is also the reason why the difference in visual perception can be clearly perceived when the same screen is replaced with a different film. Put this conclusion back into the context of "What is Contrast? Contrast Rati", and the order of judgment remains unchanged.
Is eye mask a tax on intelligence?
The key lies in whether it addresses the real pain points. Most of the dazzling screen effects come from environmental reflections and the conflict of adaptation between environmental brightness and screen brightness, rather than "too much blue light". If a film claims to block blue light through dyeing, but the cost is that the entire screen will turn yellow and the light transmittance will decrease, the benefit and cost will be inverted. If it aims at reflectivity and light output state (no staining, no matte finish), the pain points and methods will be in line. As for "What is Contrast? Contrast Rati", the method for checking the aperture is the same as mentioned above.
Is it true that the more expensive the eye mask, the better?
No, there is no monotonous relationship between price and experience. Anti-peeping films and frosted films each have their own costs, and optical structural solutions may not be the most expensive one for every demand. First, determine the demand (clarity first, privacy first or anti-fingerprint first), and then see which route can solve it at the lowest cost. The criterion for such questions related to "What is Contrast? Contrast Rati" is also "verifiable".