3D using optical addressing

The problem with using high frame rate liquid crystal displays to create a 3D image is that these displays are only 25 mm across. Lap-top sized displays with high frame rates could be made using polysilicon transistors, but it is difficult to make these accurately on the 50 inch screens needed for video games.
 
We use a device called an "optically addressed spatial light modulator". An optically addressed spatial light modulator comprises a layer of liquid crystal over a layer of photosensor sandwiched beween two sheets of glass coated in transparent conductor. A voltage is placed across the two sheets of glass so that when light lands anywhere on the photosensor, it becomes conducting and electrons pass through to switch the adjacent area of liquid crystal. 

We image a video projector onto the photosensitive side of the optically addressed spatial light modulator, and the projected image is transferred into the liquid crystal. The combination behaves like a liquid crystal display, but optically addressed spatial light modulators are simple devices which need no lithography, so can be made large at low cost.
The three dimensional image is created in the same way as with a liquid crystal display, by scanning the screen with collimated light.

The problem with this system is that it is rather bulky.

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