All-in-one teaching has become a "powerhouse" of education informationization and equipment, and gradually accepted the "pioneers" projector "baton", for the major national primary and secondary school teachers and students has brought the new intelligent, personalized interactive teaching and learning experience, education becoming an information based society popularization to more areas.
Recently, the comparison between teaching and projection equipment on health issues (especially the visual effects of teachers and students) has become a hot topic. The national radio and television product quality supervision and inspection center (hereinafter referred to as the national radio and television quality inspection center) gave a clear answer to this: teaching one-sider is more protective than projection.

In the use of the projector in the classroom, the students watch the images are projected on the screen of the projector reflected light, if we want to ensure desktop illumination reached 150 lx, by now the minimum contrast (minimum standards of image recognition), the brightest part of projectors projected on the screen illumination should reach 1500 lx, if is the classroom use of 100 - inch screen, projector to at least 4050 lumens, it only can satisfy the engineering projectors. In general, the number of projectors used in the classroom is below 3000. Therefore, to ensure the visibility of the screen, teachers often need to draw the shade curtain to reduce the illumination of the ambient light in the classroom. But it caused the fall of student desktop illumination, while the students view when switching on the desktop and screen repeatedly, equivalent to a switch in the dark field and light field, repeatedly over the long term, the students' visual fatigue caused by extremely easily, cause eyesight to drop.
And the projector in use after a period of time, aging lens, lens and dust and other reasons cause the projection image fuzzy, when students are watching the ciliary muscle needs repeated focusing lens, are more likely to cause eyestrain.
Interactive intelligent plate, on the other hand, USES a built-in back light, belong to the direct light source, surface brightness between 300-500 nit, affected by the ambient light is not big, without reducing environment brightness when actual use, this is to ensure the students to read the desktop has a bright environment.
And the difference between the desktop illumination and the front of the screen is not big, the change of the pupil is very small when the view is switched between the desktop and the screen, and it is not easy to cause visual fatigue. Tablet at the same time, the interactive intelligence service life can reach more than 50000 hours, the entire life cycle without replacement bulbs and other consumables, without dust removal process, the screen resolution and contrast can guarantee is far higher than the projection, reduction of color is more real, can effectively relieve eye fatigue.
Of course, if the user with eyes, there's not a good habit, for example, ignore the environment light, do not pay attention to use eye sanitation, do not pay attention to the adjustment of the eye and protection, so even if you don't use multimedia display device, its vision will decline because of the improper with the eye.