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IPS (In-plane switching) is a screen technology for liquid crystal displays (LCDs). It was designed to solve the main limitations of the twisted nematic field effect (TN) matrix LCDs in the late 1980s. These limitations included strong viewing angle dependence and low-quality colour reproduction. In-plane switching involves arranging and switching the orientation of the molecules of the liquid crystal (LC) layer between the glass substrates. This is done, essentially, parallel to these glass plates. == History == The TN method was the only viable technology for active matrix TFT LCDs in the late 1980s and early 1990s. Early panels showed gray inversion from up to down, and had a high response time (for this kind of transition, 1ms is visually better than 5ms). 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-digital electrodes on one glass substrate only to produce an electric field essentially parallel to the glass substrates.〔: R. Soref, ''Liquid crystal electric field sensing measurement and display device'', filed 28 June 1973.〕 However, the inventor was not yet able to implement such IPS-LCDs superior to TN displays. After thorough analysis, details of advantageous molecular arrangements were filed in Germany by Guenter Baur ''et al.'' and patented in various countries including the US on 9 January 1990. The Fraunhofer Society in Freiburg, where the inventors worked, assigned these patents to Merck KGaA, Darmstadt, Germany. Shortly thereafter, Hitachi of Japan filed patents to improve this technology. A leader in this field was Katsumi Kondo, who worked at the Hitachi Research Center.〔(【引用サイトリンク】title=2014 SID Honors and Awards )〕 Later, LG Display and other South Korean, Japanese, and Taiwanese LCD manufacturers adapted IPS technology. Today, IPS technology is widely used in panels for TVs, tablet computers, and smartphones. In particular, all Apple Inc. products marketed with the label ''Retina Display'' (such as iPhone 4 onwards,〔(Technical specifications iPhone 5c )〕 iPad 3 onwards,〔(Comparison of iPad models )〕 iPad Mini 2 onwards, Mac Book Pro with Retina display〔(Technical specifications Mac Book Pro with Retina display )〕) feature IPS LCDs with LED backlighting. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IPS panel」の詳細全文を読む スポンサード リンク
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