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in-plane switching effects, IPS [4] fringe-field switching effect, FFS vertically aligned effects, VA [5] multi-domain vertical alignment, MVA [6] patterned vertical alignment, PVA [7] PI-cell [8] (aka OCB-cell) OCB: optically compensated bend-mode cholesteric-nematic phase-change with dichroic dyes [9]
In the mid-1990s new technologies were developed—typically IPS and vertical alignment (VA)—that could resolve these weaknesses and were applied to large computer monitor panels. One approach patented in 1974 was to use inter-digitated electrodes on one glass substrate only to produce an electric field essentially parallel to the glass ...
Before an electric field is applied, the orientation of the liquid-crystal molecules is determined by the alignment at the surfaces of electrodes. In a twisted nematic (TN) device, the surface alignment directions at the two electrodes are perpendicular to each other, and so the molecules arrange themselves in a helical structure, or twist ...
By the 1990s, TN-effect LCDs were largely universal in portable electronics, although since then, many applications of LCDs adopted alternatives to the TN-effect such as in-plane switching (IPS) or vertical alignment (VA). Many monochrome alphanumerical displays without picture information still use TN LCDs.
These polarizing properties depend on the alignment of the liquid-crystal layer and the specific field-effect used, being either Twisted Nematic (TN), In-Plane Switching (IPS) or Vertical Alignment (VA). Color is produced by applying appropriate color filters (red, green and blue) to the individual subpixels.
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This is an LCD technology derived from the IPS by Boe-Hydis of Korea. Known as fringe field switching (FFS) until 2003, [21] advanced fringe field switching is a technology similar to IPS or S-IPS offering superior performance and color gamut with high luminosity. Color shift and deviation caused by light leakage is corrected by optimizing the ...
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