Since the eyes always send two images to the brain at once, people are able to apprehend their surroundings in three dimensions. The different viewing angles are then translated into the geometric dimensions of an object – height, depth and width. This perception works in three ways: Using special glasses, the display image can be split into an image for the right eye and one for the left. Polarization glasses thus make use of purely optical effects. Shutter glasses use an electro-optical effect when switching. Leading manufacturers are currently working on autostereoscopic displays. They represent different images in different viewing angles – the viewer does not need glasses.
Perception with shutter glasses
The TV sector is signaling a new era for 3D television, since image quality in conjunction with high definition televisions (HDTV) is not yet satisfactory with most 3D technologies. The 'frame sequential' method is currently the most widespread. This 3D HDTV technology shows images for the left and right eye alternately at high speed – at 120 hertz, for example, this means 60 images per second for each eye. This technology can only be used with shutter glasses. The impression of depth is created in the brain and a three-dimensional image is formed. The lenses in the shutter glasses switch electronically between permeable and impermeable by darkening the right or left lens alternately as the displayed images switch. For shutter glasses, displays are used which permit very high frame rates, so that the overlap between the image for the right eye and the image for the left is imperceptible.
High speed liquid crystal mixtures from EMD Performance Materials
EMD Performance Materials develops, produces and sells high speed liquid crystal mixtures for active 3D shutter glasses. Liquid crystals and reactive mesogens from EMD Performance Materials allow the high frame rates in 3D screens necessary for 3D applications with shorter switching times.