5.2.4 LCD glasses
This method is mostly used to view images on the computer display, but it can also be used to view stereo images projected on the reflecting screen. It is based on the following principle:
- the viewer puts on glasses with liquid crystal elements inside them, which can become opaque when they receive a signal;
- the right and left images are displayed on the screen in turns. The frequency of changing images should be high enough (not less than 60 Hz) for the viewer not to notice flicker;
- synchronously with images displayed on the screen, liquid crystal shutter glasses interrupt the light flow for the left and right eyes in turns.
- Glasses are controlled by synchronous impulses that can be transmitted either by cable or using a wireless method.
You can see the liquid crystal shutter glasses "E-D glasses" manufactured byeDimensional, Inc (www.edimensional.com) in Fig. 19.
Fig. 19. Liquid crystal shutter stereo glasses and connection accessories (picture from www.really.ru)