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| 释义 |
AMOLED (active-matrix organic light-emitting diode, {{IPAc-en|ˈ|æ|m|oʊ|ˌ|l|ɛ|d}}) is a display device technology used in smartwatches, mobile devices, laptops, and televisions. OLED describes a specific type of thin-film-display technology in which organic compounds form the electroluminescent material, and active matrix refers to the technology behind the addressing of pixels. {{as of|2008}}, AMOLED technology has been used in mobile phones, media players and digital cameras, and continued to make progress toward low-power, low-cost and large-size (for example, 40-inch or 100-centimeter) applications.[2][3][4]{{POV statement|date=May 2015}}{{Update inline|date=October 2016}}DesignAn AMOLED display consists of an active matrix of OLED pixels generating light (luminescence) upon electrical activation that have been deposited or integrated onto a thin-film transistor (TFT) array, which functions as a series of switches to control the current flowing to each individual pixel.[5] Typically, this continuous current flow is controlled by at least two TFTs at each pixel (to trigger the luminescence), with one TFT to start and stop the charging of a storage capacitor and the second to provide a voltage source at the level needed to create a constant current to the pixel, thereby eliminating the need for the very high currents required for passive-matrix OLED operation.[6] TFT backplane technology is crucial in the fabrication of AMOLED displays. In AMOLEDs, the two primary TFT backplane technologies, polycrystalline silicon (poly-Si) and amorphous silicon (a-Si), are currently used offering the potential for directly fabricating the active-matrix backplanes at low temperatures (below 150 °C) onto flexible plastic substrates for producing flexible AMOLED displays.[7] DisadvantagesRed and green OLED films have longer lifespans compared to blue OLED films. This variation results in color shifts as a particular pixel fades faster than the other pixels. This is amplified with the effect of pixel burn-in, and that blue pixels are used very frequently.[1] AMOLED displays are prone to screen burn-in, which leaves a permanent imprint of overused colors represented by overused images. This usually only happens if the screen is used at maximum brightness for an extended period of time.[1] Future developmentManufacturers have developed in-cell touch panels, integrating the production of capacitive sensor arrays in the AMOLED module fabrication process. In-cell sensor AMOLED fabricators include AU Optronics and Samsung. Samsung has marketed its version of this technology as "Super AMOLED". Researchers at DuPont used computational fluid dynamics (CFD) software to optimize coating processes for a new solution-coated AMOLED display technology that is competitive in cost and performance with existing chemical vapor deposition (CVD) technology. Using custom modeling and analytic approaches, Samsung has developed short and long-range film-thickness control and uniformity that is commercially viable at large glass sizes.[10] Comparison to other technologiesAMOLED displays provide higher refresh rates than passive-matrix,{{Nonspecific|date=November 2011}} often reducing the response time to less than a millisecond, and they consume significantly less power.[11] This advantage makes active-matrix OLEDs well-suited for portable electronics, where power consumption is critical to battery life. The amount of power the display consumes varies significantly depending on the color and brightness shown. As an example, one commercial QVGA OLED display consumes 0.3 watts while showing white text on a black background, but more than 0.7 watts showing black text on a white background, while an LCD may consume only a constant 0.35 watts regardless of what is being shown on screen.[12] Because the black pixels turn completely off, AMOLED also has contrast ratios that are significantly higher than LCD.[2] AMOLED displays may be difficult to view in direct sunlight compared with LCDs because of their reduced maximum brightness.[14]{{Citation needed|date=February 2017}} Samsung's Super AMOLED technology addresses this issue by reducing the size of gaps between layers of the screen.[15][16] Additionally, PenTile technology is often used for a higher resolution display while requiring fewer subpixels than needed otherwise, sometimes resulting in a display less sharp and more grainy than a non-PenTile display with the same resolution. The organic materials used in AMOLED displays are very prone to degradation over a relatively short period of time, resulting in color shifts as one color fades faster than another, image persistence, or burn-in.[17][18] As of 2010, demand for AMOLED screens was high and, due to supply shortages of the Samsung-produced displays, certain models of HTC smartphones were changed to use next-generation LCD displays from the Samsung-Sony joint-venture SLCD in the future.[3] Flagship smartphones sold as of December 2011 used either Super AMOLED or IPS panel premium LCD. Super AMOLED displays, such as the one on the Galaxy Nexus and Samsung Galaxy S III have often been compared to IPS panel premium LCDs, found in the iPhone 4S, HTC One X, and Nexus 4.[4][5][6] For example, according to ABI Research the AMOLED display found in the Motorola Moto X draws just 92 mA during bright conditions and 68 mA while dim.[7] On the other hand, compared with the IPS, the yield rate of AMOLED is low; the cost is also higher. Marketing termsSuper AMOLED"Super AMOLED" is a marketing term created by device manufacturers for an AMOLED display with an integrated digitizer: the layer that detects touch is integrated into the screen, rather than overlaid on top of it. The display technology itself is not improved. According to Samsung, Super AMOLED reflects one-fifth as much sunlight as the first generation AMOLED.[25][26] Super AMOLED is part of the Pentile matrix family, sometimes abbreviated as SAMOLED. For the Samsung Galaxy S III, which reverted to Super AMOLED instead of the pixelation-free conventional RGB (non-PenTile) Super AMOLED Plus of its predecessor Samsung Galaxy S II, the S III's larger screen size encourages users to hold the phone further from their face to obscure the PenTile effect.[8] Super AMOLED AdvancedSuper AMOLED Advanced is a term marketed by Motorola to describe a brighter display than Super AMOLED screens, but also a higher resolution — qHD or 960×540 for Super AMOLED Advanced than WVGA or 800×480 for Super AMOLED and 25% more energy efficient. Super AMOLED Advanced features PenTile, which sharpens subpixels in between pixels to make a higher resolution display, but by doing this, some picture quality is lost.[9] This display type is used on the Motorola Droid RAZR and HTC One S.[10] Super AMOLED PlusSuper AMOLED Plus, first introduced with the Samsung Galaxy S II and Samsung Droid Charge smartphones, is a branding from Samsung where the PenTile RGBG pixel matrix (2 subpixels) used in Super AMOLED displays has been replaced with a traditional RGB RGB (3 subpixels) arrangement typically used in LCDs. This variant of AMOLED is brighter and therefore more energy efficient than Super AMOLED displays[30] and produces a sharper, less grainy image because of the increased number of subpixels. In comparison to AMOLED and Super AMOLED displays, they are even more energy efficient and brighter. However, Samsung cited screen life and costs by not using Plus on the Galaxy S II's successor, the Samsung Galaxy S III.[5] HD Super AMOLEDHD Super AMOLED is a branding from Samsung for an HD-resolution (above 1280×720) Super AMOLED display. The first device to use it was the Samsung Galaxy Note. The Galaxy Nexus and the Galaxy S III both implement the HD Super AMOLED with a PenTile RGBG-matrix (2 subpixels/pixel), while the Galaxy Note II uses an RBG matrix (3 subpixels/pixel) but not in the standard 3 stripe arrangement.[24] HD Super AMOLED PlusA variant of the Samsung Galaxy S3 using Tizen OS 1 was benchmarked using a non-pentile HD Super AMOLED Plus screen in 2012.[11] Full HD Super AMOLEDAs featured on the Samsung Galaxy S4, Samsung Galaxy S5, and Samsung Galaxy Note 3, this display has a 1920×1080 resolution that is better known as 1080p. It has a color gamut of up to 97% of the Adobe RGB color space.[12][13] Quad HD Super AMOLEDQuad HD Super AMOLED technology was first used by AU Optronics in April 2014.[14] After AU Optronics released their phone which used a Quad HD Super AMOLED screen, other companies such as Samsung released phones utilizing the technology such as the Samsung Galaxy Note 4 and Samsung Galaxy Note 5 Broadband LTE-A and Samsung Galaxy S6 and S7. FutureFuture displays exhibited from 2011 to 2013 by Samsung have shown flexible, 3D, unbreakable, transparent Super AMOLED Plus displays using very high resolutions and in varying sizes for phones. These unreleased prototypes use a polymer as a substrate removing the need for glass cover, a metal backing, and touch matrix, combining them into one integrated layer.[15] So far, Samsung plans on branding the newer displays as Youm[16], or y-octa[17] Also planned for the future are 3D stereoscopic displays that use eye tracking (via stereoscopic front-facing cameras) to provide full resolution 3D visuals. ComparisonBelow is a mapping table of marketing terms versus resolutions and sub-pixel types. Note how the pixel density relates to choices of sub-pixel type.
References1. ^1 {{cite web|url=http://www.versiondaily.com/advantages-and-disadvantages-of-amoled-display-technology/|title=Advantages and disadvantages of AMOLED|publisher=Version Daily|date=2015-12-03|accessdate=2015-12-03|deadurl=no|archiveurl=https://web.archive.org/web/20160120002646/http://www.versiondaily.com/advantages-and-disadvantages-of-amoled-display-technology/|archivedate=20 January 2016|df=dmy-all}} [19][20][21][22][23][24][25][26][27][28][29][30][31][32]2. ^{{Cite web|url=http://www.androidauthority.com/amoled-vs-lcd-differences-572859/|title=AMOLED vs LCD: differences explained|website=Android Authority|language=en-US|access-date=2017-02-06|deadurl=no|archiveurl=https://web.archive.org/web/20161227012435/http://www.androidauthority.com/amoled-vs-lcd-differences-572859/|archivedate=27 December 2016|df=dmy-all}} 3. ^{{cite web |url=http://www.androidpit.com/super-amoled-vs-retina-display |title=Archived copy |accessdate=2012-12-16 |deadurl=no |archiveurl=https://web.archive.org/web/20120907220537/http://www.androidpit.com/super-amoled-vs-retina-display |archivedate=7 September 2012 |df=dmy-all }} Construction of new production facilities in 2011 was expected to increase the production of AMOLED screens to cope with demand. 4. ^{{cite web|url=http://www.digitaltrends.com/mobile/amoled-vs-lcd-which-screen-is-best-for-your-phone/|title=AMOLED vs LCD: Which screen is best for your phone?|author=|date=29 August 2014|website=digitaltrends.com|accessdate=6 May 2018|deadurl=no|archiveurl=https://web.archive.org/web/20180329044710/https://www.digitaltrends.com/mobile/amoled-vs-lcd-which-screen-is-best-for-your-phone/|archivedate=29 March 2018|df=dmy-all}} 5. ^1 {{cite web|url=http://www.androidpit.com/super-amoled-vs-retina-display|title=Smartphone screens explained: display types, resolutions and more - AndroidPIT|author=|date=|website=androidpit.com|accessdate=6 May 2018|deadurl=no|archiveurl=https://web.archive.org/web/20150512050251/http://www.androidpit.com/super-amoled-vs-retina-display|archivedate=12 May 2015|df=dmy-all}} 6. ^{{cite web|url=https://techcrunch.com/2012/11/02/nexus-4-review-not-exactly-perfect-but-close-enough-for-me/|title=Nexus 4 Review: Not Exactly Perfect, But Close Enough For Me – TechCrunch|author=|date=|website=techcrunch.com|accessdate=6 May 2018|deadurl=no|archiveurl=https://web.archive.org/web/20180207110037/https://techcrunch.com/2012/11/02/nexus-4-review-not-exactly-perfect-but-close-enough-for-me/|archivedate=7 February 2018|df=dmy-all}} 7. ^[https://www.abiresearch.com/press/googlemotorola-mobility-display-a-bright-efficient Google/Motorola Mobility Display a Bright Efficient Future], ABI Research 8. ^{{cite web|last=Sakr|first=Sharif|title=Samsung Galaxy S III review|url=https://www.engadget.com/2012/05/25/samsung-galaxy-s-iii-review/|publisher=Engadget|accessdate=February 6, 2013|date=25 March 2012|deadurl=no|archiveurl=https://web.archive.org/web/20130126002229/http://www.engadget.com/2012/05/25/samsung-galaxy-s-iii-review/|archivedate=26 January 2013|df=dmy-all}} 9. ^{{cite web|url=http://www.oled-info.com/super-amoled-advanced|title=Super AMOLED Advanced.|accessdate=March 24, 2014|deadurl=no|archiveurl=https://web.archive.org/web/20140324231743/http://www.oled-info.com/super-amoled-advanced|archivedate=24 March 2014|df=dmy-all}} 10. ^{{cite web|url=https://www.motorola.com/us/consumers/DROID-RAZR-BY-MOTOROLA/78281,en_US,pd.html?selectedTab=tab-2&cgid=mobile-phones#tab|title=DROID RAZR – Thinnest 4G LTE Android Smartphone – Motorola Mobility LLC. 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External links
6 : Mobile phones|Conductive polymers|Display technology|Molecular electronics|Optical diodes|Organic electronics |
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开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。