The realization method of light barrier 3D technology is to use switch LCD screen, polarizing film and polymer liquid crystal layer, and make a series of 90 vertical stripes by using liquid crystal layer and polarizing film. These stripes are tens of microns wide, and the light passing through them forms a vertical fine grating pattern, which is called "parallax barrier". This technology makes use of parallax barrier between backlight module and LCD panel. In stereoscopic display mode, when an image that should be seen by the left eye is displayed on the LCD screen, opaque stripes will block the right eye. Similarly, when the image that should be seen by the right eye is displayed on the LCD screen, the opaque stripes will block the left eye, and the viewer can see the 3D image by separating the visual images of the left eye and the right eye.

The advantage of this technology is the cost advantage, such as Sharp's 3D mobile phone and Nintendo's 3DS game console. However, the screen brightness using this technology is low. Cylindrical lens technology, also known as micro-cylindrical lens 3D technology, is to position the image plane of LCD screen on the focal plane of the lens, so that the pixels of the image under each cylindrical lens are divided into several sub-pixels, so that the lens can project each sub-pixel in different directions. So when you look at the display from different angles, you will see different sub-pixels.

Cylindrical lens technology will not affect the brightness of the screen like a light barrier, so it has better display effect than the latter.