Some monitors have a “No tear off screen film” prompt in a prominent position. In the subconscious mind of many users, isn't the film on the surface of the screen not to protect the screen from scratches? What about the removal? Of course, some monitors may have a protective film on the screen when shipped from the factory, and more monitor surfaces. The layer of film has another name - polarizing film (also known as polarizer, polarizing film), if you "hand owe" to remove it, the display will not display properly
Principle of polarizing film
LCD imaging requires three key components: backlight, LCD, polarizing film. When the display is powered on, the backlight is turned on. At this time, the light (electromagnetic wave) transmitted from the liquid crystal panel is a transverse wave propagating forward, and has vibration perpendicular to the traveling direction (up, down, left, and right), so it is called "polarized light". The problem is that the human eye cannot recognize this "polarized light", and at this time it sees a white picture.
The polarizing film is a dichroic transparent film covering the surface of the liquid crystal panel, which can "translate" the polarized light that is not recognized by the human eye into a recognizable color and present it (Fig. 3). So the problem is simple, the surface of the display is because of a layer of polarizing film to display the picture, and if you uncover it, it is natural to face the "polarized light" without seeing anything.
If it is a touch display (or notebook screen), it will be covered with a protective glass outside the LCD screen and polarizing film, so you don't have to worry about the problem of polarizing the polarizing film. As for the notebook screen, there is also a polarizing film on the surface, but the edge of the LCD is just covered by the screen frame, even if you want to tear it off, there is no place to start. Unless we remove the screen frame and see the exposed LCD as a whole, we can see the existence of the polarizing film from the edge. It will also cause the problem that the screen becomes white and cannot be displayed.
For ordinary users, the display polarizing film can not be touched anyway, otherwise the display will be basically scrapped, and it is difficult to re-purchase the matching polarizing film. But if you have enough hands-on ability and like to taste the pranks, then the polarizer has a very interesting gameplay.
The author briefly introduces the idea: tear the polarizing film on the surface of the display, and the display will be pure white, and nothing can be seen. Look for a pair of glasses, cut the polarized film into small pieces according to the size of the lens, and attach it to the lens. Now, looking at the screen with glasses with a polarizing film, is it normal? But the glasses are white.
That's right, this method is a very different solution for anti-spy film. In fact, the so-called "anti-peep film" on the market is also an extension of the polarizing film. The screen with the anti-spy film will limit the viewing angle to the screen only, from the side. Lack of polarizing film filtration.
When we put the PC, the most unbearable thing is that the screen is straight to the window, which is very important for the reflection of the screen in daylight. The problem is coming, even if we pay attention to the placement of the PC, there are still problems that are easily disturbed by the lights. At this point, the screen named "Anti-Glare" went to the foreground.
What is an anti-glare screen?
As the name implies, the anti-glare screen is a reflection that reduces the direct sunlight, so that the user can always see the screen, and will not feel dizzy due to reflective problems. In general, anti-glare screens are a process applied to the outermost polarizer of a LCD (ie, a polarizing film).
Anti-glare screen (glass), also known as "AG glass", the general principle is to use a chemical syrup such as hydrofluoric acid to perform a special processing on the surface of the glass to make the reflective surface of the original glass into a matte, non-reflective surface. , thereby obtaining a lower reflectance (reflectance is reduced from 8% of ordinary glass to 1%). The so-called "matte screen" in the market is actually a manifestation of anti-glare screens.
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The laptop privacy screen is also called the anti-peep film, which is “left and right anti-theft” (also called 180 degree anti-peeping).