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



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7. Using a single camera phone


It is possible to produce a 3D display using a single camera phone. The display of a camera phone has to share two stereoscopic images, and the left and right images have to be transposed. The details of the slip-on stereoscopic mirrors are shown in Fig. 8 (from Ref. 4). The scene taken in by the right outer 100 % reflecting ordinary mirror reaches the left side of the stereoscopic image by way of the inner two 50 % reflecting half mirrors, and similarly, that taken in by the left outer mirror reaches the right side of the stereoscopic image. Thus, the transpose of the image is achieved.

 




Fig. 8 Diagram of the slip-on stereoscopic mirrors.




The slip-on stereoscopic mirrors have a wide strap to slip the camera phone securely in place as shown in Fig. 9 (from Ref 4).



Fig. 9 Photograph of slip-on stereoscopic mirrors.




One takes a pair of stereoscopic images by pressing the shutter key of the camera phone. The stereoscopic pair is then sent to a dialed distant receiver phone. On the receiver end, only the left half of the receiver phone's liquid crystal is covered by the cellophane sheet so as to rotate the direction of the polarization of the light from the left half of the liquid crystal display. Thus, a stereoscopic pair of images with orthogonal polarization is made on the receiver camera phone display. The observer at the receiver end can view the 3D image by wearing a crossed polarizer glasses such as shown in Fig. 3 or clip-on polarizer glasses which can be flipped up for ordinary viewing. Figure 9 shows the operation of the slip-on stereoscopic mirrors.

An interesting feature of this camera is that at the time the 3D picture is taken, the composition of the 3D image can be readily examined on a preview screen even before the shutter is activated if the cellophane sheet remains on the left half of the display screen of the transmitter camera phone at all times. It behaves like a real-time 3D display. The sender can examine the 3D image. The 3D effect is more dramatic if the object is a close object like faces, flowers, birds, pets or trains or gardens, but the 3D is not as effective with far objects like scenery, mountains, or countryside. The sender can pre-examine the photo before sending the picture.



The quality of the transmitted 3D picture is compared with that taken in an ordinary manner in Fig. 10 (from Ref 4). The slip-on stereoscopic mirrors inflicted no noticeable degradation in picture quality.



Fig. 10 Comparison of the 3D pictures. The picture on the left was taken in an ordinary manner, and the right, taken with the slip-on stereoscopic mirrors.



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