Definition
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.
Principle and Background
The backlight of an LCD is a continuously lit light source (mostly DC dimming or high-frequency PWM), and its stroboscopic performance is usually better than that of a low-brightness OLED. However, the polarization state is also linearly polarized, and the reflection problem is the same as that of OLED.
The circularly polarized light control experiment in 2009 was carried out on a liquid crystal screen - by installing a 1/4λ wave plate on a liquid crystal TV, the polarization state of its output light could be changed. The experimental path is the same as the principle of today's mobile phone films.
The impact on the screen viewing experience
LCD users can also benefit from circular polarization conversion and AR coating. gfd-android Universal version covers a large number of LCD/ flat-screen Android models.
The connection with Woowhead technology
The scinique® 1.0 dual-protection synergistic optical technology is compatible with both Android and Apple devices. The technical page comparison table specifically lists the performance of the "original screen linearly polarized light (computer, some Android devices)" test card.
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
The LCD screen belongs to the "Screen Display" category of the Woowhead Eye Protection Knowledge Base. When it comes to products, the corresponding entry points are as follows - 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
Is the LCD screen 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 an LCD Screen? LCD Screen", 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 an LCD Screen? LCD Screen", 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. For such questions related to "What is an LCD Screen? LCD Screen", the criterion for judgment is also "verifiable".