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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 ...
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]
IPS-Pro: Panasonic: Solely for LCD TV markets and known as IPS Alpha Technology Ltd. [26] Panasonic, Hitachi, Toshiba H-IPS & P-IPS: LG Display: They also produce other type of TFT panels such as TN for OEM markets such as mobile, monitor, automotive, portable AV and industrial panels. LG, Philips, BenQ S-IPS: Hannstar: Chunghwa Picture Tubes ...
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.
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This technology results in wide viewing angles while boasting good contrast ratios and faster response times than those of TN and IPS displays. The major drawback is a reduction in brightness. Patterned Vertical Alignment (PVA): This type of display is a variation of MVA and performs very similarly, but with much higher contrast ratios.
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