2D/3D Stereoscopic Displays for LCDs
By Sung J. Lee, Min J. Kim, Kyo H. Lee, and Kwang H. Park, Pavonine Inc.
One problem with the conventional structure of flat-panel LCD displays is that it limits viewing angles and distances. To remedy that, a Korean company has developed two types of a structured 2D/3D switchable stereoscopic LCD display by changing the structure of the conventional thin-film transistor (TFT) LCD. Multiple viewers can watch a 3D image on this display simultaneously and the company expects it to be used as a 2D/3D switchable LCD panel in the next generation of flat-panel LCDs.
The conventional stereoscopic LCD display has a patterned retarder (Figure 1), in which horizontal strips of half-wave (or quarter-wave) retarders alternates with those of transparent glasses attached to the outer surface of the TFT-LCD. This display requires polarized glasses to view 3D images.
A new structure
The proposed structure for the wire grid polarizer (WGP), which contains rows of alternating polarization angles, can be seen in Figure 2. When a voltage is applied, an incidence light (L1) with a polarization orientation of 45 degrees enters WGP 1, transmits it to the liquid crystal layer before being blocked by WGP 3 which has a polarization orientation of 135 degrees. The incidence light (L2) transmits to WGP 2) and the LC (liquid crystal) layer. After this, it is absorbed by WGP 4, which has a polarization orientation of 45 degrees. Of course, when an electric field for the LC layer is turned off, incidence beams L1 and L2 transmit to WGP 3 and WGP 4, respectively1.
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