The projector is relatively less harmful.
The projector is projected on the wall or screen, and the light is diffusely reflected into the eyes, close to the natural light, compared to other electronic displays more suitable for the human body to accept, and the projection screen itself does not have radiation. And the projected image is wide, more in line with the visual habits of the human eye, can effectively reduce the child's eyestrain, from the root to eliminate eyestrain caused by vision loss.
But if the brightness, resolution, and contrast adjustment of the projection equipment are not balanced, and if the characters on the projector are adjusted to a smaller size, the child's prolonged gaze on the projector screen is likely to cause visual fatigue and lead to myopia. LCD TV hard-screen panel than soft-screen has a higher dynamic clarity, more suitable for watching sports images.
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Experts judge that improper use of the projector can indeed cause visual impairment. Due to amplification, the projector itself image clarity is lower than the computer screen, more likely to cause eye fatigue, and even more inappropriate for a long time to watch the movement of the screen. Plus if the projector's brightness, contrast, font color settings are not reasonable, it will cause excessive eye use, causing eye function spasm, and eye function spasm is the precursor of myopia.
Baidu Encyclopedia-Projector