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Retina Display (marketed by Apple with a lowercase 'D' as Retina display) is a brand name used by Apple for screens that have a higher pixel density than their previous models.〔 The goal of Retina Displays is to make the display of text and images extremely crisp, so pixels are not visible to the naked eye. This allows displays to rival the smooth curves and sharpness of printed text and immediacy of photographic prints.〔(【引用サイトリンク】url=https://www.apple.com/pr/library/2012/03/07Apple-Launches-New-iPad.html )〕 These better quality displays have been gradually released over a number of years, and the term is now used for nearly all of Apple products containing a screen, including the Apple Watch, iPhone, iPod Touch, iPad, Macbook, MacBook Pro, and iMac.〔(【引用サイトリンク】title=Apple – Learn about the Retina display )〕 Apple uses slightly different versions of the term for these models, including ''Retina HD Display'' (iPhone 6 models), and ''Retina 5K Display'', ''Retina HD Display'' or ''Retina 4K/5K Display'' (iMac). Apple's Retina Displays are not an absolute standard but vary depending on the size of the display on the device, and how close the user would typically be viewing the screen. Where the user views the screen closer to them, as on smaller devices with smaller displays, they have higher PPI, while on larger devices with larger displays where the user views the screen further away, have a lower PPI. Later device versions have had additional improvement, either counted by an increase in the screen size (the iPhone 6 Plus) and/or by PPI (the iPhone 6 and 6 Plus, and iMac with Retina 4K/5K Display), thus Apple using the name "Retina HD Display" or "Retina 4K/5K Display". When an Apple product has a Retina Display, each user interface widget is doubled in width and height to compensate for the smaller pixels. Apple calls this mode ''HiDPI mode''. Apple has applied to register the term "Retina" as a trademark in regard to computers and mobile devices with the United States Patent and Trademark Office, Canadian Intellectual Property Office, and in Jamaica.〔 Claims priority filing date with respect to prior application in Jamaica.〕〔 Also cites prior application in Jamaica.〕 On November 27, 2012 the US Patent and Trademark office approved Apple's application and "Retina" is now a registered trademark for computer equipment. ==Models== The displays are manufactured worldwide by different suppliers. Currently, the iPad's display comes from Samsung, while the MacBook Pro, iPhone, and iPod Touch displays are made by LG and Japan Display Inc.〔(【引用サイトリンク】title=News related to IPO of Japan Display Inc. )〕 There was a shift of display technology from twisted nematic (TN) liquid-crystal displays (LCDs) to in-plane switching (IPS) LCDs starting with the iPhone 4 models. Apple markets the following devices as having a Retina Display, Retina HD Display, or Retina 4K/5K Display: 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「retina display」の詳細全文を読む スポンサード リンク
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