Intelligent projector, this product completely irrelevant to the TV, with the advancement of projector intelligent technology in the past two years, began to really go to the "opposite side" of the TV. At the same time, the advertising words such as “No Screen TVâ€, “Private Theater†and “Home Theater†gradually entered the public eye. Technically, the miniature projectors equipped with intelligent systems have gradually emerged. However, the two are better and worse, and it still needs time to verify. Xiaobian here mainly focuses on the protection of vision.
I believe that everyone has heard such advice "less watching TV, hurting the eyes", and the fact is true. What is the TV that hurts our eyes? The same is to look at the eyes, what is the difference between the projector and the TV? How can we avoid this kind of damage to protect our eyes? Let's take a look at Xiaobian!
First, direct light and reflected light
Most TVs are now "LED backlight LCD TVs", which directly stimulate the human eye with RGB-LED backlight illumination, so we call the TV here direct light; and the pico projector is through RGB-LED The light source illuminates and then projects onto the curtain or the wall is visible to the human eye, so the projection is reflected light. That is to say, we watch TV directly staring at the light source, and looking at the projection is the projection reflection surface. Just like reading a book, it is to reflect the sunlight instead of looking directly at the sun. From this point of view, the TV's damage to the human eye is obviously higher than the projector.
In addition to increasing the brightness of the liquid crystal display, in addition to the brightness of the light pipe behind the screen, it is also generally used to make the surface of the display surface look like a piece of glass after a special "brightening technology". It also increases the color contrast and saturation of the screen. But it also reflects light like glass. Especially when the light shines on the screen, it will increase the light reflection. Consumers who use this type of display are easily "stabbed" by light and have symptoms of eye fatigue, which can slowly cause health problems such as decreased vision and headache. The wall projected by the projector obviously does not have specular reflection like the display.
Second, the blue light hazard
When it comes to light, here is the "first killer of the human eye" - Blu-ray, the full name of Blu-ray is called High Energy Visible Lights, we know that light is an electromagnetic radiation, which is enhanced by the increase of energy and frequency. . The blue light is the most energetic light in visible light, which is higher than the UV frequency that we can avoid in our daily life, and the damage is even greater. So it is not horrifying to say that Blu-ray may cause "blindness". This is one of the biggest reasons for the sharp rise in the rate of teenage myopia in the electronic digital age.
Both the projector and the TV use RGB-LED light source, that is, red, yellow and blue three-color LED light source, and these three color LEDs are most important as "blue LED", and weakening blue light will cause color distortion. The overall picture is reddish yellow. Let's take a look at the spectral composition of the two main LED modules, W-LED (common) and GB-LED. As shown below:
Spectral composition of LED displays
It can be seen that whether it is W-LED or GB-LED, the proportion of short-wave blue component is high, and the long-term use will be more irritating to the human eye. But the same light source, the micro projector that is imaged by reflection is obviously less harmful than the direct TV. Projection has a parameter called brightness. If the brightness is suitable, it will have no effect. If it is too dark and too bright, it will also be bad for vision. The home entertainment suggests that the actual brightness is about 250 ANSI lumens. (A cat has too many virtual marks on a certain treasure, it is recommended to choose a big brand. ).
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