Long story short, more eye-catching and more interactive.
Now at home online classes, the most used devices are nothing more than mobile phones, iPads, and televisions, but they use direct light sources, and projectors are diffuse reflection imaging.
Direct light source is equivalent to light directly into our eyes, diffuse light first projected on the wall, and then into our eyes. In this contrast, diffuse reflection is better for the eyes, and long-term viewing is less harmful to the eyes.
Now many parents' biggest concern is the child's eyes, at this time, the large screen of the projector and its more eye-pleasing diffuse reflection principle, just can hit the parents' pain points.
The whole use down, on the one hand, adults do not always have to urge children to watch the time to arrive, quickly turn off and the like, on the one hand, the screen is large and clear, the interactive effect is strong, and it is easier to stimulate children's interest in learning.