Do you know what is privacy screen protector? How do it work? Do we need privacy screen protector for cellphone, tablet, laptop and computer?

Many readers should have the feeling that when playing mobile phones on the subway, bus or other public situation, there are always someone staring at your screen. Although they may not have any thoughts, people still don’t like to be seen by strangers, then you need a little privacy protection.

So, what technology does the privacy screen protector use that make your screen can be seen only by yourself?

lost privacy in public place

What is a privacy screen protector?

Anti-Spy Film is short for anti-peeping (looking) film or privacy film, another common term is anti-peeping film; Other names. Privacy protection film or: privacy filter.


In terms of viewing angle of commercially available products, it can be divided into:

  • left and right 25-degree viewing angle;
  • left and right 30-degree viewing angle;
  • and left and right 45-degree viewing angle. etc.;

In a word, the smaller the visible angle, the greater the peephole angle, the better the peephole effect.


The direction of peephole can be divided into:


  1. left and right peephole (i.e. 180 degree peephole);
  2. four-sided peephole (i.e. 360 degree peephole, up, down, left and right four-sided) ).

The thickness of the anti-screening film is between 0.15mm and 0.6mm.


The purpose of the privacy screen is to make the screen be viewed only from the front through a filter. When the viewing angle is off the center, the screen will be darker until it is completely black.

Filters with this effect can prevent others from peeking from your side of your screen thus to protect your privacy.

anti spy effect for iphone privacy screen protector

In fact, anti-spy film has long been used in ATM screens and other public places that need to protect users’ privacy. In addition, as the data in smartphones becomes more and more important, anti-spy screen protector for mobile phones has become popular.

Do we need one in the digital information age?

We will meet many people in the big world. We don’t refuse to reach out to this society, but our privacy may leak in a casual moment, protecting ourselves is also protecting our family.

In public, private information, album, confidential documents and business information in the phone can be saw by the other around in the public easily which is really embarrassed for us and other.

key privacy information in public

PERFECTSIGHT privacy screen protector use micro-louver optical technology and provide a screen display effect with 60 degrees clear in the front.While 180 degrees dark in the side which protect your privacy also your eyes.

PERFECTSIGHT privacy screen protector can protect your screen information from prying eyes in public.

  • Easy chat
  • Secure transaction
  • Private journey
  • Trade secrets
  • More protection, more peace of mind

If you like the effect of anty spy tempered glass screen protector, pls click following link »»

How do privacy screen protectors work?

The technical principle of the privacy screen protector is “Microlouver Technology“, and according to our further verification, this name should come from 3M company.

Although the technology of the privacy screen protector sounds very cool, it is actually not that complicated.

Its principle is simply similar to vertical blinds, when you stand in front of the opened vertical blinds, the scenery in front of you can be seen at a glance.But when you stand on the side, the scenery outside the window will be blocked by the blinds.

micro-louver technology silimar to window shade principle
micro-louver technology silimar to window shade principle

The privacy screen protector is to make the blades of the blinds thin enough, and embed hundreds of blades in a film, so that the front view is not affected, and the screen is slightly darker when the viewing angle is slightly sideways.

At this point, careful readers may find that, according to the principle, the privacy screen protector can only prevent the left and right from being peeped, but it will not affect the viewing experience of the screen in the up and down direction, that is to say, only the left and right sides will be non-visible with a viewing angle over 30°.

anti spy effect for PERFECTSIGHT privacy screen protector
anti spy effect for PERFECTSIGHT privacy screen protector

The technical principle of the anti-spy screen protector is simple, and the effect is quite good, so it has been favored by many computer and mobile phone users.

Are privacy screen protectors bad for your eyes?

Although the privacy screen protector is effective, which is a simple and effective means of protecting your privacy, but its shortcomings are also very obvious.

After all, there is a small “blade” structure in the anti-peep film. This special structure will block some of the light. Even if you look at the screen from the front, you will still feel that the screen is darker than before, so that the brightness and color of the screen will be affected to a certain degree.

In addition, the automatic brightness control of the mobile phones with the privacy screen protector will not be as sensitive as before, because the original brightness is not bright enough after the film is applied, so you need to manually adjust to increase the screen brightness, which will cost more power consumption.

Finally, long-term viewing of the screen under dim brightness conditions has a negative impact on our vision. If you do need this screen protector to protect your privacy, we recommend you adjust the screen to the proper brightness when using it to avoid the screen being too dark.

Final Conclusion on anti spy screen protector

iphone privacy screen protector

In general, the anti-peep screen protector is indeed a useful tool for privacy protection, but it is currently impossible to does not affect the brightness and color of the screen at all, which must be noted. At present, the price of the privacy screen protector is not expensive, the readers who are particularly concerned with privacy can try it.

Are privacy screen protectors good?

  • Privacy screen protectors are from the ultimate privacy solution that some phone owners want. It’s not perfect either, so you’ll have to get used to a slightly reduced display experience.
  • Keeping prying eyes away in public areas might be necessary for some though, and that’s when the privacy screen protector is an absolute must-have.
  • If it all possible, it would be best to simply avoid accessing sensitive information while in public though. Phone and display makers spend millions to offer impressive viewing experiences and no user wants to have that taken away. That said, privacy trumps showing off a vivid display. Ultimately, you’re the best person to judge whether a privacy screen protector is something you’ll need.

Does a privacy screen protector reduce blue light?

  • As far as antispy screen protector itself is concerned, it doesn’t reduce blue light.


  • But as far as the principle of the anti-peep film is concerned, since it reduces the light transmission rate and brightness, it also block part of the blue light to some extent, from From this point of view, he is acting as an interceptor of blue light, which is very limited in effect.

What is the best privacy screen protector?

A good privacy filter is bound to the first requirement is the anti-spyglass effect to be good, the second requirement of light transmission rate should be high.

In addition, the anti-spy film can not have stripes, can not have black spots, no surface scratches, etc..

There are a lot of technical difficulties that need to be overcome in the current production technology, such as the overall light transmittance is not high, and the current material is not good. The transmittance is distributed between 50% and 85%; the overall color is dark, grayish black.

Does the privacy screen protector affect your vision?

Most people usually have this question because the brightness of the original screen is reduced after the privacy filter is applied, and some have streaks and some are right. The surface of the anti-peeping film has a frosted (AG treatment, the main anti-glare, reflective need) texture discomfort.

It is recommended that you use the anti-spy screen protector, the brightness of the appropriate brighter, both sides of the computer anti-spy glass screen protector can be facing outward, under bright light is recommended AG! Face (matte surface) facing outward, can be anti-reflective, but also anti-scratch, AG surface has done hardening treatment, the surface hardness of 3H;

The obvious streaks are caused by the processing technology of the anti-peep film, and can be solved by choosing products with strict quality control.