Eye lamp? Why does it sound so unreliable? Whether it can really play an eye protection role remains to be examined.
But it's true that electronic screens can hurt the eyes, especially when used for a long time. For children whose vision is still developing, online classes should choose a display device that is less harmful to the eyes, such as a home projector.
Compared with electronic products such as mobile phones and computers, projectors are indeed more helpful in protecting children's vision, but they cannot be watched for a long time every day, and parents need to strictly control their children's viewing time. Next, Lingying will analyze why the projector is more suitable for online lessons for children:
The first is light. Mobile phone, computer or TV is the principle of direct light source, light directly into the eyes, easy to cause visual fatigue, more damage to the eyes. The home projector uses the principle of diffuse reflection imaging, the light is first projected onto the white wall or curtain, and then enters the eyes, and there is more than one turning process in the middle, which is more helpful for alleviating eye fatigue and protecting vision.
This is followed by blue light. Computers, television such display screens are the use of backlight to improve the brightness of the screen, the need to emit white light, but there is no white light in nature, so white light needs to be mixed with blue light and green light, yellow light after presentation, which leads to screen backlight contains more blue light, more likely to cause damage to the eyes.
In addition, the size of the screen, the projector screen is larger than the TV, computer, the child can maintain a long viewing distance, effectively relieve eye fatigue, protect vision.
And the splash screen, although it is now difficult for the naked eye to detect the flickering of mobile phones, computers or TV screens, but it is objectively existent, easy to cause eye fatigue, the projector through the wall or curtain reflection imaging, into the human eye has been quite stable, the eye damage is relatively small.
These are the use of projectors to give children online lessons more advantages than other equipment, as for how to choose, Lingying also summarized a few points for your reference.
1. If the budget allows, try to choose high brightness. In general, projectors above 2000 ANSI lumens can be used normally during the day, avoiding the need to use with blackout curtains, resulting in low brightness in the indoor environment and causing visual fatigue.
2. Projection ratio, if it is a 100-inch picture, it is recommended that the projection distance is more than 3.5 or 4 meters, and the viewing distance that is more favorable to the eyes can be maintained under the premise of ensuring clear picture quality.
3. Similarly, choose a high brightness, the resolution should also be high, it is recommended 1080P or above. Here Xiaoying wants to remind everyone: look at the resolution to see the standard resolution in the parameters, not the compatible resolution. For example, the standard resolution is 1080P, the compatible resolution is 2k/4k, then its actual resolution is only 1080P, the so-called 2k/4k is obtained through decoding, not the real picture quality.
4. System. It is recommended to give priority to the intelligent projector, with its own system, easy to operate, some (such as Lingying intelligent education projection series) can also choose the adolescent learning mode, to avoid children addicted to entertainment, after exiting the mode, adults can freely watch movies and games. One machine dual use, free switching.