How come you can see 3d on the nintendo 3ds without special 3d glasses?

Answer 1

http://kombo.com/features/How_the_3DS_Works/

Check out this article ^^ The simple answer is Parallax barrier ^^

Answer 2

The 3DS shows two different pictures, from slightly different angles/viewpoints, to your eyes (1 picture per eye). The human brain is able to sense depth this way (which is why humans have two eyes, aka "Stereoscopic vision").

Instead of getting the seperate pictures using glasses (that either block/show a different image per eye), the screen itself is set up so that it will show each eye a different image if held in the right location. (Which is why the 3ds is sensitive to changes in movement. The 3d effect only works when it's held in the proper spot relative to your eyes).

 

TLDR - the 3DS uses two different images, one per eye, to trick the human brain into thinking it's seeing 3D (ie. Depth). The screen is set up special so that when viewed from the proper location, each eye sees something different.

Answer 3

here's an image that explains it

Answer 4

I'm going to say this as simply as possible, there's two screens, one on top of the other, and the send out 2 images, one to each eye.

Answer 5

The way the 3d effect works is by showing each eye a differet image. The images are the same scene but each from a slightly different perspective (about an eye width difference). Most 3d projection schemes use polorized glasses which only let light spinning a certain way through (warning: laymans terms). This lets places like movies theaters the two images to a whole movie theater full of people. The 3ds takes a different approach and just projects the two images using alternative pixel rows in different directions so that if you are facing the 3ds and your eyes are about 3 feet away, you will see the image as 3d. This 3d effect will only work for one person at a time however.