Using cellophane to convert a liquid crystal display screen into a three dimensional display



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6. Eliminating the Need to Wear Polarizer Glasses


The necessity for the observer to wear polarizer glasses can be eliminated by letting the display screen wear the glasses instead. The use of a magnifying lens becomes practical by encasing the two camera phones in a small box with an opening on its cover. (In case of a laptop computer, make a cover with an opening.) The box is made telescopic so that the depth of the box is adjustable. As shown in Fig. 7, a polarizer sheet is placed in the opening with its transmission axis at 135from the horizontal direction.

 


Fig. 7 Eliminating the need to wear glasses.




The right half of the polarizer sheet is covered by a cellophane sheet in order to change the direction of the transmission axis to 45.

Even though a glass lens was used in Fig. 7, a plastic lens has the advantage of lighter weight. If a plastic lens is used, it should not be placed between any polarizer sheets because it may create birefringent fringe patterns due to residual stress in the plastic lens. The plastic lens should be placed on the outside surface of the box rather than on the inside surface.

It should be added that this approach is possible because both a laptop computer and a camera phone normally have only one viewer at a time, and the viewer instinctively holds his or her head in a position to match the position of the display. But as the position of the eyes move away from the opening, the range of the allowed lateral movement of the eyes decreases and finally the tolerance becomes uncomfortably small.

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