Why can I watch 3D animation on my mobile phone? Why don't I need to wear 3D glasses?

The mobile phone can watch 3D animation or video, mainly because the mobile phone screen itself is a stereoscopic screen, and 3D glasses are not needed.

Traditional 3D movies need to wear 3D glasses, because these movies produce stereoscopic effects by providing different images to the left eye and the right eye respectively. 3D glasses project these different images to the left eye and the right eye respectively, so that the audience can see the stereoscopic effect.

When you watch 3D animation or video on your mobile phone, you usually use a technology called autostereoscopic. This technology makes use of the parallax effect of human eyes to produce stereoscopic effect by alternately displaying the images of left and right eyes on the screen. Specifically, when we see the images alternately displayed on the screen, our left and right eyes will receive different images respectively, thus creating a stereoscopic impression.

The advantage of autostereoscopic technology is that you don't need to wear 3D glasses, and the viewing experience is more convenient and comfortable. However, because this technology can't fully simulate the real 3D effect, there may be some distortion or unreality in the viewing process.

In short, the mobile phone can watch 3D animation or video because it uses the autostereoscopic technology of the screen and does not need to wear 3D glasses. However, the viewing effect may not be as good as that of traditional 3D movies, and it needs to be selected according to the specific situation.