Patterned polarizers

The application of photoalignment to the fabrication of polarizers has a unique advantage over other methods such as mechanical shearing. The polarizer can be patterned - both the spatial pattern as well as the orientation of the optical axis can be finely patterned by photolithography. This may offer a new technique for making many new displays, such as a 3D display with the left and right eye seeing different polarizations. 

It is more useful to pattern the polarizer in pixelated form. For example, it may be possible to make transflective displays with subpixels having different polarizer orientations, with one subpixel being in the transmissive mode and the other one being in the reflective mode. We shall discuss such a possibility in Section 5.3. 

Another application of pixelated polarizers is in making 3D displays. It is possible to have the left and right eye seeing different pictures on the same LCD screen if alternate pixels have different polarized output. Thus a simple eye glass with complementary polarizers will allow a 3D image to be observed. 

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The interpretation of what these peaks mean in terms of structure was made by Tanaka et al. by comparing the numerical values of peaks shown in Table 5.38 with values obtained for the corresponding solids where the structure is known by means of the interpretation of X-ray diffraction patterns. Polarized light in the exciting source was used in the investigation and indicated the degree of symmetry in the structure of the ion being observed. 

Matsunaga D, Tamaki T, Akiyama H, Ichimura K. 2002. Photofabrication of micro patterned polarizing elements for stereoscopic displays. Adv Mater 14 1477 1480. 

Figure 12.7 Structure of carbon fiber, (a) A schematic iiiustralion of tree trunk or onion skin structure (ieft) and radial structure (right), (b) A typicai opticai micrograph of carbon fiber cross sections under polarized light in crossed nicols condition showing maltose cross patterns. Polarizer and analyzers are parallel to picture edges. Source Reprinted from Nyo H, Heckler AJ, Hoemschemeyer DL, Characterizing the structures of PAN based carbon fibers, 24 Nat Symposium, San Francisco, 179, 51-60, May 8-10.

To calculate the characteristics of an antenna, the distribution of current on the elements must be known in advance. From the current distribution, the vector potential can be computed, and ultimately the electric field E and magnetic field H can be found. With this information, the radiation pattern, polarization, directivity, and other parameters can be described. 

Manufacturing of new optical elements for LC technology, such as patterned polarizers and phase retarders, tunable optical filters, polarization non-sensitive optical lenses, with voltage-controllable focal distance etc. 

To compare various applications of photoalignment technology for in-cell patterned polarizers and phase retarders, transflective and microdisplays, security... 

Figure 5.7 shows a patterned polarizer [7]. In this case the polarizer has a fixed pattern. Presumably it can also be a pixelated pattern. The color of the polarizer... 

Transflective LCD ifh Photo-patterned Polarizers and Phase Retarders... 

With the help of simple masks, photoalignment provides a means of patterning polarizers and phase retarders inside an LCD. It offers display designers much more freedom in optimizing the performance of the display. In addition to patterned polarizers and retardation films, photoalignment also allows different areas or subpixels to have different LCD modes. Many types of displays will become possible with the availability of such patterning of the pixels and subpixels. One... 

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