Types of 3D technology
• Active shutter: This technology requires glasses that electronically open and close liquid crystal lenses over each eye, synchronized with a 3-D video display. When this display presents a left eye image, the glasses cover the right eye so only the left eye sees the display, and vice versa for the other eye. This process is repeated more than a hundred times per second and is virtually undetectable to the user. Although movies in active shutter 3-D are extremely rare, the technology is often used for PC games in 3-D and 3-D education projection.
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