Eclipse method
Eclipse method
With the eclipse method, a mechanical shutter blocks light from each appropriate eye when the converse eye’s image is projected on the screen. The projector alternates between left and right images, and opens and closes the shutters in the glasses or viewer in synchronization with the images on the screen. This was the basis of the Teleview system which was used briefly in 1922.
A pair of LCD shutter glasses used to view XpanD 3D films.
A variation on the eclipse method is used in LCD shutter glasses. Glasses containing liquid crystal that will let light through in synchronization with the images on the cinema, TV or computer screen, using the concept of alternate-frame sequencing. This is the method used by nVidia, XpanD 3D, and earlier IMAX systems. A drawback of this method is the need for each person viewing to wear expensive, electronic glasses that must be synchronized with the display system using a wireless signal or attached wire. The shutterglasses are heavier than most polarized glasses though lighter models are no heavier than some sunglasses or deluxe polarized glasses.[12] However these systems do not require a silver screen for projected images.
[edit] Interference filter technology
Dolby 3D uses specific wavelengths of red, green, and blue for the right eye, and different wavelengths of red, green, and blue for the left eye. Eyeglasses which filter out the very specific wavelengths allow the wearer to see a 3D image. This technology eliminates the expensive silver screens required for polarized systems such as RealD, which is the most common 3D display system in theaters. It does, however, require much more expensive glasses than the polarized systems. It is also known as spectral comb filtering or wavelength multiplex visualization
The recently introduced Panavision 3D system also uses this technology, though with a wider spectrum and more “teeth” to the “comb” (5 for each eye in the Panavision system). Panavision also claim that their glasses are cheaper to manufacture than those used by Dolby
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Tags: 3D television, Liquid crystal shutter glasses, Nvidia, Panavision, RealD Cinema, Shopping, Teleview, XpanD 3D