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Hittorf observed that some unknown rays were emitted from the ] (negative electrode) which could cast shadows on the glowing wall of the tube, indicating the rays were traveling in straight lines. In 1890, ] demonstrated cathode rays could be deflected by ]s, and ] showed they could be deflected by magnetic fields. In 1897, ] succeeded in measuring the charge-mass-ratio of cathode rays, showing that they consisted of negatively charged particles smaller than atoms, the first "]s", which had already been named '']s'' by Irish physicist, ] in 1891. The earliest version of the CRT was known as the "Braun tube", invented by the German physicist ] in 1897.<ref>Ferdinand Braun (1897) (On a process for the display and study of the course in time of variable currents), ''Annalen der Physik und Chemie'', 3rd series, '''60''': 552–559.</ref> It was a ] ], a modification of the ] with a ]-coated screen. | |||
The first cathode-ray tube to use a ] was developed by ] (who gave his name to the term ]) and Harry Weiner Weinhart of ], and became a commercial product in 1922.{{cn|date=February 2020}} The introduction of hot cathodes allowed for lower acceleration anode voltages and higher electron beam currents, since the anode now only accelerated the electrons emitted by the hot cathode, and no longer had to have a very high voltage to induce electron emission from the cold cathode.<ref name="auto68">{{Cite book|author=Thorn-AEI Radio Valves and Tubes Limited <!--http://www.r-type.org/articles/art-004e.htm-->|title=Electrons in Picture Tubes|location= United Kingdom|date=1964}}</ref> | |||
In 1926, ] demonstrated a CRT television that received images with a 40-line resolution.<ref name="nhk.or.jp">, NHK (Japan Broadcasting Corporation), 2002, retrieved 23 May 2009.</ref> By 1927, he improved the resolution to 100 lines, which was unrivaled until 1931.<ref>{{cite book |last1=Forrester |first1=Chris |title=High Above: The untold story of Astra, Europe's leading satellite company |date=2011 |publisher=Springer Science & Business Media |isbn=978-3-642-12009-1 |page=220 |url=https://books.google.com/books?id=wQhlFaxDwrsC&pg=PA220 }}</ref> By 1928, he was the first to transmit human faces in half-tones on a CRT display.<ref name="abramson">Albert Abramson, ''Zworykin, Pioneer of Television'', University of Illinois Press, 1995, p. 231. {{ISBN|0-252-02104-5}}.</ref> By 1935, he had invented an early all-electronic CRT television.<ref>'']'', </ref> | |||
It was named in 1929 by inventor ],<ref>Albert Abramson, ''Zworykin, Pioneer of Television'', University of Illinois Press, 1995, p. 84. {{ISBN|0-252-02104-5}}.</ref> who was influenced by Takayanagi's earlier work.<ref name="abramson"/> ] was granted a trademark for the term (for its cathode-ray tube) in 1932; it voluntarily released the term to the public domain in 1950.<ref>"RCA Surrenders Rights to Four Trade-Marks," Radio Age, October 1950, p. 21.</ref> | |||
In the 1930s, ] made the first CRTs to last 1,000 hours of use, which was one of the factors that led to the widespread adoption of television.<ref>{{cite news |last1=Hart |first1=Hugh |title=Jan. 29, 1901: DuMont Will Make TV Work |url=https://www.wired.com/2010/01/jan-29-1901-dumont-will-make-tv-work-2/ |work=Wired |date=28 January 2010 }}</ref> | |||
The first commercially made electronic television sets with cathode-ray tubes were manufactured by ] in Germany in 1934.<ref>, Early Electronic TV Gallery, Early Television Foundation.</ref><ref>, Television History: The First 75 Years.</ref> | |||
From 1949 to the early 1960s there was a shift from circular CRTs to rectangular CRTs, although the first rectangular CRTs were made in 1938 by Telefunken.<ref>{{Cite web|url=http://www.earlytelevision.org/telefunken_rfb_t2.html|title=Telefunken RFB/T2|website=www.earlytelevision.org}}</ref><ref name="auto68"/><ref>Television Digest, 1949 issue<!--https://worldradiohistory.com/Archive-TV-Digest/40s/TV-Digest-1949-01.pdf--></ref><ref name="auto42">https://worldradiohistory.com/Archive-Radio-Age/ElectronicAge-1964-Autumn.pdf</ref><ref name="auto102">https://www.earlytelevision.org/motorola_prototype_crt.html</ref><ref name="auto30">https://vintagetek.org/wp-content/uploads/2017/07/Tek-CRT-History-Keller-Oct-2007-Pt5.pdf</ref> While circular CRTs were the norm, European TV sets often blocked portions of the screen to make it appear somewhat rectangular while American sets often left the entire front of the CRT exposed or only blocked the upper and lower portions of the CRT.<ref>{{Cite web|url=https://collection.sciencemuseumgroup.org.uk/objects/co8067379/raytheon-model-m-1601-console-television-receiver-television-receiver|title=Raytheon Model M-1601 console television receiver | Science Museum Group Collection|website=collection.sciencemuseumgroup.org.uk}}</ref><ref>{{Cite web|url=https://www.earlytelevision.org/westinghouse_890cku19.html|title=Westinghouse 19 Inch Color TV Ad|website=www.earlytelevision.org}}</ref> | |||
In 1954 RCA produced some of the first color CRTs, the 15GP22 CRTs used in the ],<ref name="auto90">{{Cite web|url=https://www.earlytelevision.org/15gp22.html|title=15GP22 Color CRT|website=www.earlytelevision.org}}</ref> the first color TV set to be | |||
mass produced.<ref>{{Cite web|url=https://lancasteronline.com/news/rca-pioneers-remember-making-the-first-color-tv-tube/article_2d5e6fb1-6c7d-55ce-82b8-255fe3c15497.html|title=RCA pioneers remember making the first color TV tube|first=Tim Mekeel And Laura|last=Knowles|website=LancasterOnline}}</ref> The first rectangular color CRT were also made in 1954.<ref>{{cite web|url=https://www.earlytelevision.org/dumont_color_crt.html|title=DuMont Experimental Color|author= Early Television Museum}}</ref><ref>https://www.earlytelevision.org/pdf/zenith_rectangular_crt.pdf</ref> However, the first color rectangular CRTs to be offered to the public were made in 1963. One of the challenges that had to be solved to produce the rectangular color CRT was convergence at the corners of the CRT.<ref name="auto102"/><ref name="auto42"/> In 1965, brighter rare earth phosphors began replacing dimmer and cadmium-containing red and green phosphors. Eventually blue phosphors were replaced as well. <ref>{{Cite web|url=https://patents.justia.com/patent/3989977|title=US Patent for Color picture tube Patent (Patent # 3,989,977 issued November 2, 1976) - Justia Patents Search|website=patents.justia.com}}</ref><ref>{{Cite web|url=https://patents.google.com/patent/US3394084A/en|title=Rare earth activated indium borate cathodoluminescent phosphors}}</ref><ref>{{Cite web|url=https://patents.google.com/patent/US3418246A/en|title=Rare earth activated yttrium and gadolinium oxy-chalcogenide phosphors}}</ref><ref name="auto93">http://bitsavers.trailing-edge.com/components/rca/crt/TPM-1508A_RCA_Phosphors_Oct61.pdf</ref><ref name="auto40">{{cite web|url=https://toshiba-mirai-kagakukan.jp/learn/history/ichigoki/1972cathode_ray/index_j.htm|title=東芝未来科学館:世界初のブラック・ストライプ方式ブラウン管|language=Japanese|author=Toshiba Corporation}}</ref><ref>{{Cite web|url=https://patents.google.com/patent/US3440080A/en|title=Cathode ray tube color screen and method of producing same}}</ref> | |||
The size of CRTs increased over time, from 19 inches in 1938,<ref>{{Cite web|url=https://www.crtsite.com/page3.html|title=The Cathode Ray Tube site, Cathode Ray Tubes.|website=www.crtsite.com}}</ref> to 21 inches in 1955,<ref name="auto59">{{Cite web|url=http://www.earlytelevision.org/21axp22.html|title=21AXP22|website=www.earlytelevision.org}}</ref><ref>{{Cite web|url=https://www.earlytelevision.org/22_inch_color_tubes.html|title=CBS and Westinghouse 22 Inch Rectangular Color Tubes|website=www.earlytelevision.org}}</ref> 35 inches by 1985,<ref>{{Cite web|url=https://www.pcworld.com/article/142550/article.html|title=1988 vs. 2008: A Tech Retrospective|date=22 February 2008|website=PCWorld}}</ref> and 43 inches by 1989.<ref>https://docs.sony.com/release/PVM4300.pdf The KX-45ED1 by sony was even larger, at 45 visible inches, and it was released in 1988 in Japan, but i couldn't find any reliable sources about it</ref> However, experimental 31 inch CRTs were made as far back as 1938.<ref>{{Cite web|url=https://www.earlytelevision.org/rca_31inch_crt.html|title=RCA 31 Inch CRT|website=www.earlytelevision.org}}</ref> | |||
In 1960 the ] was invented. It was a CRT in a flat panel display format with a single electron gun.<ref>{{Cite web|url=https://www.earlytelevision.org/geer_color_crt.html|title=Geer Experimental Color CRT|website=www.earlytelevision.org}}</ref><ref>{{Cite web|url=https://www.theatlantic.com/photo/2011/10/50-years-ago-the-world-in-1961/100172/|title=50 Years Ago: The World in 1961 - The Atlantic|first=Alan|last=Taylor|website=www.theatlantic.com}}</ref> Deflection was electrostatic and magnetic but due to patent problems it was never put into production. It was also envisioned as a ] in aircraft.<ref>{{Cite web|url=http://www.earlytelevision.org/fairchild_crt.html|title=Fairchild Flat Screen CRT|website=www.earlytelevision.org}}</ref> By the time patent issues were solved RCA had already invested heavily in conventional CRTs.<ref>{{Cite web|url=http://blog.modernmechanix.com/flat-screen-tv-in-1958/|title=Flat Screen TV in 1958 - Popular Mechanics (Jan, 1958)}}</ref> | |||
In 1987, flat screen CRTs were developed by Zenith for computer monitors, reducing reflections and helping increase image contrast and brightness.<ref name="auto106">{{Cite web|url=https://books.google.com/books?id=Frbtc4mssNQC&q=crt+shadow+mask+metal&pg=PA24|title=Popular Science|first=Bonnier|last=Corporation|date=5 August 1986|publisher=Bonnier Corporation|via=Google Books}}</ref><ref name="auto84">{{Cite web|url=https://books.google.com/books?id=kwEAAAAAMBAJ&q=shadow+mask+heat+warping&pg=PA45|title=Popular Science|first=Bonnier|last=Corporation|date=5 April 1992|publisher=Bonnier Corporation|via=Google Books}}</ref> Such CRTs were expensive which limited their use to computer monitors.<ref name="auto94">{{Cite web|url=https://www.chicagotribune.com/news/ct-xpm-1991-09-30-9103140692-story.html|title=TV MAKERS TUNING IN TO FLAT SCREENS TO HELP ROUND OUT SALES|first=Rich|last=Warren|website=chicagotribune.com}}</ref> Attempts were made to produce flat screen CRTs using inexpensive and widely available ].<ref name="auto37">{{Cite web|url=https://www.crtsite.com/page3-3.html|title=Prototype CRT's|website=www.crtsite.com}}</ref> | |||
In 1990, the first CRTs with HD resolution were released to the market by Sony.<ref>{{Cite web|url=http://home.bt.com/tech-gadgets/television/retro-tech-the-crt-tv-11363858003032|title=History of the CRT TV|website=BT.com}}</ref> | |||
In the mid 1990s, some 160 million CRTs were made per year.<ref name="auto27">{{Cite web|url=https://www.toshiba.co.jp/about/press/1995_12/pr2101.htm|title=Toshiba : Press Releases 21 December, 1995}}</ref> | |||
]s dropped in price and started significantly displacing cathode-ray tubes in the 2000s. After several predictions,<ref>{{Cite web|url=https://amp.smh.com.au/national/lcds-to-outsell-crt-monitors-soon-idc-20051007-gdm7ln.html|title=LCDs to outsell CRT monitors soon: IDC|website=amp.smh.com.au}}</ref><ref>{{Cite web|url=https://www.computerworld.com/article/2580706/idc--lcds-to-outsell-crt-monitors-in-2003.amp.html|title=IDC: LCDs to outsell CRT monitors in 2003 | Computerworld|website=www.computerworld.com}}</ref> LCD monitor sales began exceeding those of CRTs in 2003-2004<ref>{{Cite web|url=https://www.zdnet.com/article/lcds-outsell-crts-in-q4-2003/|title=LCDs outsell CRTs in Q4 2003|first=Kristyn|last=Maslog-Levis|website=ZDNet}}</ref><ref>{{Cite web|url=https://www.audioholics.com/news/lcds-overtake-and-outsell-crts-in-q3-2004|title=LCDs Overtake and Outsell CRTs in Q3 2004!|website=Audioholics Home Theater, HDTV, Receivers, Speakers, Blu-ray Reviews and News}}</ref><ref>{{Cite web|url=https://www.eetimes.com/lcd-monitors-outsold-crts-in-q3-says-displaysearch/|title=LCD monitors outsold CRTs in Q3, says DisplaySearch | EE Times}}</ref> and LCD TV sales started exceeding those of CRTs in the US in 2005,<ref>{{Cite web|url=https://www.tvtechnology.com/news/canada-daytek-adds-40inch-lcd-hd|title=Canada: Daytek Adds 40-Inch LCD HD|first=TVTechnology 28|last=September 2005|website=TVTechnology}}</ref> in Japan in 2005-2006,<ref>{{Cite web|url=https://www.arnnet.com.au/article/149076/lcd_tv_shipments_beat_crt_japan_2005/|title=LCD TV shipments beat CRT in Japan in 2005|website=ARN}}</ref><ref>{{Cite web|url=https://www.macworld.com/article/1055675/bigscreen_crt_tv_business_in_j.html|title=Big-screen CRT TV business in Japan all but over|date=24 July 2006|website=Macworld}}</ref><ref>{{Cite web|url=https://www.cio.com/article/2445384/big-screen-crt-tv-biz-in-japan-all-but-finished.html|title=Big-Screen CRT TV Biz in Japan All But Finished|first=C. I. O.|last=Staff|date=24 July 2006|website=CIO}}</ref> in Europe in 2006,<ref>{{Cite web|url=https://www.macworld.com/article/1054094/lcdsales.amp.html|title=LCDs outsell CRTs in Europe | Macworld|website=www.macworld.com}}</ref> globally in 2007-2008,<ref>{{Cite web|url=https://www.theregister.com/2008/02/22/displaysearch_crt_lcd_global_q4/|title=Global LCD TV sales overtake CRT|first=James|last=Sherwood|website=www.theregister.com}}</ref><ref>{{Cite web |url=http://graphics.thomsonreuters.com/10/04/GLB_TVTECH0410.gif |title=Archived copy |access-date=3 April 2018 |archive-url=https://web.archive.org/web/20131011135725/http://graphics.thomsonreuters.com/10/04/GLB_TVTECH0410.gif |archive-date=11 October 2013 |url-status=dead }}</ref> and in India in 2013.<ref>{{Cite web|url=https://www.thehindubusinessline.com/news/Indians-switch-off-cathode-ray-TVs/article20802085.ece|title=Indians switch off cathode ray TVs|first=Amit|last=Mitra|website=@businessline}}</ref> | |||
In the mid 2000s, Canon and Sony presented the ] and ]s, respectively. They both were flat panel displays that had one (SED) or several (FED) electron emitters per subpixel in place of electron guns; the electron emitters were placed on a sheet of glass and the electrons were accelerated to a nearby sheet of glass with phosphors using an anode voltage; the electrons were not focused making each subpixel essentially a flood gun CRT. They were never put into mass production as LCD technology was significantly cheaper, eliminating the market for such displays.<ref>{{Cite web|url=https://www.goodgearguide.com.au/article/357585/canon_signals_end_road_sed_tv_dreams/|title=Canon signals end of the road for SED TV dreams|website=Good Gear Guide}}</ref> | |||
The last known manufacturer of (in this case, recycled)<ref>{{Cite web|url=https://resource-recycling.com/e-scrap/2015/01/09/three-more-years-of-videocon-crt-demand/|title=Three more years of Videocon CRT demand?|date=9 January 2015}}</ref> CRTs, ], ceased in 2015.<ref name="auto88">{{Cite web|url=https://resource-recycling.com/e-scrap/2020/03/12/a-look-at-where-californias-crt-glass-is-going/|title=A look at where California's CRT glass is going|date=12 March 2020}}</ref><ref>{{Cite web|url=https://www.npr.org/sections/alltechconsidered/2016/08/15/489629491/saying-goodbye-to-old-technology-and-a-legendary-nyc-repair-shop|title=Saying Goodbye To Old Technology — And A Legendary NYC Repair Shop|website=NPR.org}}</ref> CRT TVs stopped being made around the same time.<ref>{{Cite web|url=https://www.business-standard.com/article/companies/onida-exits-dvd-business-aims-to-phase-out-crt-tv-manufacturing-by-2015-114012800284_1.html|title=Onida exits DVD business, aims to phase out CRT TV manufacturing by 2015|website=Business Standard}}</ref> | |||
In 2015, several CRT manufacturers were convicted in the US for ]. The same occurred in Canada in 2018.<ref>{{Cite web|url=https://globalnews.ca/news/4648296/price-fixing-settlement-old-tvs/|title=Price fixing settlement: If you owned a TV in 1995 you could get money back|website=Global News}}</ref><ref>{{cite news |last1=Levine |first1=Dan |title=Companies in cathode ray tube price fixing lawsuit reach $528 million deal |url=https://www.reuters.com/article/us-samsung-philips-settlement-idUSKBN0OH3BX20150601 |work=Reuters |date=1 June 2015 }}</ref> | |||
===Demise=== | |||
Worldwide sales of CRT computer monitors peaked in 2000, at 90 million units, while those of CRT TVs peaked in 2005 at 130 million units.<ref name="auto20">{{Cite web|url=https://news.mit.edu/2010/crt-recycle|title=CRTs going down the tubes? Hardly|website=MIT News | Massachusetts Institute of Technology}}</ref> | Worldwide sales of CRT computer monitors peaked in 2000, at 90 million units, while those of CRT TVs peaked in 2005 at 130 million units.<ref name="auto20">{{Cite web|url=https://news.mit.edu/2010/crt-recycle|title=CRTs going down the tubes? Hardly|website=MIT News | Massachusetts Institute of Technology}}</ref> | ||
Beggining in the late 90s to the early 2000s CRTs began to be replaced with LCDs, starting first with computer monitors smaller than 15 inches in size<ref>{{Cite web|url=http://edition.cnn.com/2002/TECH/ptech/02/15/crt.monitors.idg/|title=CNN.com - Are you looking at your last CRT? - February 15, 2002|website=edition.cnn.com}}</ref> largely because of their lower bulk.<ref>{{Cite web|url=https://fcw.com/articles/1999/07/25/flexscan-l66-a-sound-choice-in-flatpanel-displays.aspx|title=FlexScan L66: A sound choice in flat-panel displays -|first1=By Pat|last1=McClung|first2=1999|last2=Jul 25|website=FCW}}</ref> Among the first<ref>{{Cite web|url=https://apnews.com/article/e8298d721b0631753c8a451d73591073|title=GE Announces Tube Plant Closing; 790 Jobs Cut|website=AP NEWS}}</ref> manufacturers to stop CRT production was ], in 2001,<ref>{{Cite web|url=https://www.extremetech.com/extreme/50240-hitachi-will-still-manufacture-crt-monitors|title=Hitachi Will Still Manufacture CRT Monitors - ExtremeTech|website=www.extremetech.com}}</ref><ref>{{Cite web|url=https://www.theregister.com/2001/07/26/hitachi_to_ditch_crt_monitors/|title=Hitachi to ditch CRT monitors|first=Robert|last=Blincoe|website=www.theregister.com}}</ref> followed by Sony in Japan in 2004,<ref name="auto62">{{Cite web|url=https://www.marketwatch.com/story/sony-to-stop-making-old-style-cathode-ray-tube-tvs|title=Sony to stop making old-style cathode ray tube TVs|website=MarketWatch}}</ref> ] in the US in 2004,<ref>{{Cite web|url=https://www.tvtechnology.com/amp/news/thomson-shuts-down-american-picture-tube-production|title=Thomson shuts down American picture tube production | TV Technology|website=www.tvtechnology.com}}</ref><ref>{{Cite book|url=https://books.google.com/books?id=wpatIq2M5FYC&q=asahi+closes+crt+plant&pg=SL8-PA23|title=Certain Color Television Receivers from China, Invs. 731-TA-1034 (Final)|publisher=DIANE Publishing|isbn=9781457820526|via=Google Books}}</ref> ] ] picture display in 2005 in the US,<ref>{{Cite web|url=https://www.computerworld.com/article/2811895/hitachi--matsushita--toshiba-cement-lcd-venture-plan.amp.html|title=Hitachi, Matsushita, Toshiba cement LCD venture plan | Computerworld|website=www.computerworld.com}}</ref> 2006 in Malaysia<ref name="auto51">{{Cite web|url=https://www.networkworld.com/article/2305303/panasonic-toshiba-venture-to-shut-malaysia-crt-plant.html|title=Panasonic-Toshiba venture to shut Malaysia CRT plant|first=Martyn|last=Williams|date=27 July 2006|website=Network World}}</ref> and 2007 in China,<ref>{{Cite web|url=http://www.digitimes.com/news/a20070906PB203.html|title=Panasonic China stops CRT TV production at Shandong plant|website=DIGITIMES}}</ref> Sony in the US in 2006,<ref>{{Cite web|url=https://hackaday.com/2018/11/30/retrotechtacular-some-of-the-last-crts-from-the-factory-floor/|title=Retrotechtacular: Some Of The Last CRTs From The Factory Floor|date=30 November 2018}}</ref> Sony in Singapore and Malaysia for the Latin American and Asian markets in 2008,<ref name="auto62"/><ref>{{Cite web|url=https://spectrum.ieee.org/tech-talk/semiconductors/devices/sony_pulls_plug_on_historic_tr|title=Full Page Reload|website=IEEE Spectrum: Technology, Engineering, and Science News}}</ref> Samsung SDI in 2007<ref>{{Cite web|url=https://m.koreatimes.co.kr/pages/article.asp?newsIdx=15271|title=Samsung SDI Struggles to Close CRT Lines|date=10 December 2007|website=m.koreatimes.co.kr}}</ref><ref>{{Cite web|url=http://world.kbs.co.kr/service/news_view.htm?lang=e&Seq_Code=49355|title=Samsung Hungary to Halt CRT Production|website=world.kbs.co.kr}}</ref> and 2012<ref>{{Cite web|url=https://m.pulsenews.co.kr/view.php?year=2012&no=206660|title=Samsung SDI halts CRT production in Malaysia plant - Pulse by Maeil Business News Korea|website=m.pulsenews.co.kr}}</ref><ref>{{Cite web|url=https://www.mk.co.kr/news/english/view/2012/04/206660/|title=Samsung SDI halts CRT production in Malaysia plant|date=3 April 2012|website=www.mk.co.kr}}</ref> and Cathode Ray Technology(formerly Philips) in 2012<ref>{{Cite web|url=https://www.crtsite.com/page3-2.html|title=Cathode Ray Technology|website=www.crtsite.com}}</ref><ref>{{Cite web|url=http://lampes-et-tubes.info/cr/cr131.php?l=e|title=Cathode Ray Technology B.V. Engineering Model Type D10-XXX|website=lampes-et-tubes.info}}</ref> and ] in 2015-16.<ref>{{Cite web|url=https://resource-recycling.com/e-scrap/2015/10/22/videocon-shuts-down-furnaces-and-stokes-concerns/|title=Videocon shuts down furnaces - and stokes concerns|date=22 October 2015}}</ref><ref name="auto43">{{Cite web|url=https://resource-recycling.com/e-scrap/2018/02/01/demand-dwindling-questions-swirl-around-videocon/|title=With demand dwindling, questions swirl around Videocon|date=1 February 2018}}</ref><ref name="auto72">{{Cite web|url=https://resource-recycling.com/e-scrap/2016/03/03/videocon-begins-accepting-crt-glass-again/|title=Videocon begins accepting CRT glass again|first=Bobby|last=Elliott|date=3 March 2016}}</ref><ref name="auto88"/> Ekranas in Lithuania<ref>{{Cite web|url=https://www.baltictimes.com/news/articles/15121/|title=Ekranas files for bankruptcy, Vilniaus Vingis braces for worst|website=www.baltictimes.com}}</ref> and LG.Philips Displays<ref>{{Cite web|url=https://www.electronicsweekly.com/news/products/led/lg-philips-seeks-bankruptcy-protection-in-europe-2006-01/|title=LG.Philips seeks bankruptcy protection in Europe|first=Steve|last=Bush|date=27 January 2006}}</ref> went bankrupt in 2005 and 2006 respectively. Matsushita Toshiba stopped in the US in 2004 due to losses of $109 million,<ref>{{Cite web|url=https://www.computerweekly.com/news/2240058540/LCD-plant-coming-soon-after-CRT-close-down|title=LCD plant coming soon after CRT close-down|website=ComputerWeekly.com}}</ref> and in Malaysia in 2006 due to losses that almost equaled their sales.<ref name="auto51"/> The last CRT TVs at CES were shown by Samsung in 2007<ref name="auto86">{{Cite web|url=https://www.engadget.com/2007-01-07-samsung-introduces-2007-lcd-plasma-dlp-and-crt-lineup.html|title=Samsung introduces 2007 LCD, plasma, DLP and CRT lineup|website=Engadget}}</ref><ref name="auto86"/> and the last mass produced model was introduced by LG in 2008 for developing markets due to its low price.<ref>https://www.techradar.com/news/television/tv/world-s-thinnest-crt-tv-bucks-all-trends-167665</ref><ref name="auto101">{{Cite web|url=https://news.softpedia.com/news/LG-Presents-the-Slimmest-CRT-TV-Display-49012.shtml|title=LG Presents the Slimmest CRT TV Display|first=Bogdan|last=Solca|website=softpedia}}</ref> The last CRT TV by a major manufacturer was introduced by LG in 2010.<ref>{{Cite web|url=https://www.engadget.com/amp/2010-01-25-lgs-classic-tv-gives-old-crt-new-legs.html|title=LG's Classic TV gives old CRT new legs|website=Engadget}}</ref><ref>{{Cite web|url=https://www.techhive.com/article/187656/Retro_LG_Introduce_CRT_TV.amp.html|title=LG Goes Retro, Introduces New CRT TV | TechHive|website=www.techhive.com}}</ref> | Beggining in the late 90s to the early 2000s CRTs began to be replaced with LCDs, starting first with computer monitors smaller than 15 inches in size<ref>{{Cite web|url=http://edition.cnn.com/2002/TECH/ptech/02/15/crt.monitors.idg/|title=CNN.com - Are you looking at your last CRT? - February 15, 2002|website=edition.cnn.com}}</ref> largely because of their lower bulk.<ref>{{Cite web|url=https://fcw.com/articles/1999/07/25/flexscan-l66-a-sound-choice-in-flatpanel-displays.aspx|title=FlexScan L66: A sound choice in flat-panel displays -|first1=By Pat|last1=McClung|first2=1999|last2=Jul 25|website=FCW}}</ref> Among the first<ref>{{Cite web|url=https://apnews.com/article/e8298d721b0631753c8a451d73591073|title=GE Announces Tube Plant Closing; 790 Jobs Cut|website=AP NEWS}}</ref> manufacturers to stop CRT production was ], in 2001,<ref>{{Cite web|url=https://www.extremetech.com/extreme/50240-hitachi-will-still-manufacture-crt-monitors|title=Hitachi Will Still Manufacture CRT Monitors - ExtremeTech|website=www.extremetech.com}}</ref><ref>{{Cite web|url=https://www.theregister.com/2001/07/26/hitachi_to_ditch_crt_monitors/|title=Hitachi to ditch CRT monitors|first=Robert|last=Blincoe|website=www.theregister.com}}</ref> followed by Sony in Japan in 2004,<ref name="auto62">{{Cite web|url=https://www.marketwatch.com/story/sony-to-stop-making-old-style-cathode-ray-tube-tvs|title=Sony to stop making old-style cathode ray tube TVs|website=MarketWatch}}</ref> ] in the US in 2004,<ref>{{Cite web|url=https://www.tvtechnology.com/amp/news/thomson-shuts-down-american-picture-tube-production|title=Thomson shuts down American picture tube production | TV Technology|website=www.tvtechnology.com}}</ref><ref>{{Cite book|url=https://books.google.com/books?id=wpatIq2M5FYC&q=asahi+closes+crt+plant&pg=SL8-PA23|title=Certain Color Television Receivers from China, Invs. 731-TA-1034 (Final)|publisher=DIANE Publishing|isbn=9781457820526|via=Google Books}}</ref> ] ] picture display in 2005 in the US,<ref>{{Cite web|url=https://www.computerworld.com/article/2811895/hitachi--matsushita--toshiba-cement-lcd-venture-plan.amp.html|title=Hitachi, Matsushita, Toshiba cement LCD venture plan | Computerworld|website=www.computerworld.com}}</ref> 2006 in Malaysia<ref name="auto51">{{Cite web|url=https://www.networkworld.com/article/2305303/panasonic-toshiba-venture-to-shut-malaysia-crt-plant.html|title=Panasonic-Toshiba venture to shut Malaysia CRT plant|first=Martyn|last=Williams|date=27 July 2006|website=Network World}}</ref> and 2007 in China,<ref>{{Cite web|url=http://www.digitimes.com/news/a20070906PB203.html|title=Panasonic China stops CRT TV production at Shandong plant|website=DIGITIMES}}</ref> Sony in the US in 2006,<ref>{{Cite web|url=https://hackaday.com/2018/11/30/retrotechtacular-some-of-the-last-crts-from-the-factory-floor/|title=Retrotechtacular: Some Of The Last CRTs From The Factory Floor|date=30 November 2018}}</ref> Sony in Singapore and Malaysia for the Latin American and Asian markets in 2008,<ref name="auto62"/><ref>{{Cite web|url=https://spectrum.ieee.org/tech-talk/semiconductors/devices/sony_pulls_plug_on_historic_tr|title=Full Page Reload|website=IEEE Spectrum: Technology, Engineering, and Science News}}</ref> Samsung SDI in 2007<ref>{{Cite web|url=https://m.koreatimes.co.kr/pages/article.asp?newsIdx=15271|title=Samsung SDI Struggles to Close CRT Lines|date=10 December 2007|website=m.koreatimes.co.kr}}</ref><ref>{{Cite web|url=http://world.kbs.co.kr/service/news_view.htm?lang=e&Seq_Code=49355|title=Samsung Hungary to Halt CRT Production|website=world.kbs.co.kr}}</ref> and 2012<ref>{{Cite web|url=https://m.pulsenews.co.kr/view.php?year=2012&no=206660|title=Samsung SDI halts CRT production in Malaysia plant - Pulse by Maeil Business News Korea|website=m.pulsenews.co.kr}}</ref><ref>{{Cite web|url=https://www.mk.co.kr/news/english/view/2012/04/206660/|title=Samsung SDI halts CRT production in Malaysia plant|date=3 April 2012|website=www.mk.co.kr}}</ref> and Cathode Ray Technology(formerly Philips) in 2012<ref>{{Cite web|url=https://www.crtsite.com/page3-2.html|title=Cathode Ray Technology|website=www.crtsite.com}}</ref><ref>{{Cite web|url=http://lampes-et-tubes.info/cr/cr131.php?l=e|title=Cathode Ray Technology B.V. Engineering Model Type D10-XXX|website=lampes-et-tubes.info}}</ref> and ] in 2015-16.<ref>{{Cite web|url=https://resource-recycling.com/e-scrap/2015/10/22/videocon-shuts-down-furnaces-and-stokes-concerns/|title=Videocon shuts down furnaces - and stokes concerns|date=22 October 2015}}</ref><ref name="auto43">{{Cite web|url=https://resource-recycling.com/e-scrap/2018/02/01/demand-dwindling-questions-swirl-around-videocon/|title=With demand dwindling, questions swirl around Videocon|date=1 February 2018}}</ref><ref name="auto72">{{Cite web|url=https://resource-recycling.com/e-scrap/2016/03/03/videocon-begins-accepting-crt-glass-again/|title=Videocon begins accepting CRT glass again|first=Bobby|last=Elliott|date=3 March 2016}}</ref><ref name="auto88"/> Ekranas in Lithuania<ref>{{Cite web|url=https://www.baltictimes.com/news/articles/15121/|title=Ekranas files for bankruptcy, Vilniaus Vingis braces for worst|website=www.baltictimes.com}}</ref> and LG.Philips Displays<ref>{{Cite web|url=https://www.electronicsweekly.com/news/products/led/lg-philips-seeks-bankruptcy-protection-in-europe-2006-01/|title=LG.Philips seeks bankruptcy protection in Europe|first=Steve|last=Bush|date=27 January 2006}}</ref> went bankrupt in 2005 and 2006 respectively. Matsushita Toshiba stopped in the US in 2004 due to losses of $109 million,<ref>{{Cite web|url=https://www.computerweekly.com/news/2240058540/LCD-plant-coming-soon-after-CRT-close-down|title=LCD plant coming soon after CRT close-down|website=ComputerWeekly.com}}</ref> and in Malaysia in 2006 due to losses that almost equaled their sales.<ref name="auto51"/> The last CRT TVs at CES were shown by Samsung in 2007<ref name="auto86">{{Cite web|url=https://www.engadget.com/2007-01-07-samsung-introduces-2007-lcd-plasma-dlp-and-crt-lineup.html|title=Samsung introduces 2007 LCD, plasma, DLP and CRT lineup|website=Engadget}}</ref><ref name="auto86"/> and the last mass produced model was introduced by LG in 2008 for developing markets due to its low price.<ref>{{Cite web|url=https://www.techradar.com/news/television/tv/world-s-thinnest-crt-tv-bucks-all-trends-167665|title=World's thinnest CRT TV bucks all trends|first=J. Mark Lytle 09|last=March 2007|website=TechRadar}}</ref><ref name="auto101">{{Cite web|url=https://news.softpedia.com/news/LG-Presents-the-Slimmest-CRT-TV-Display-49012.shtml|title=LG Presents the Slimmest CRT TV Display|first=Bogdan|last=Solca|website=softpedia}}</ref> The last CRT TV by a major manufacturer was introduced by LG in 2010.<ref>{{Cite web|url=https://www.engadget.com/amp/2010-01-25-lgs-classic-tv-gives-old-crt-new-legs.html|title=LG's Classic TV gives old CRT new legs|website=Engadget}}</ref><ref>{{Cite web|url=https://www.techhive.com/article/187656/Retro_LG_Introduce_CRT_TV.amp.html|title=LG Goes Retro, Introduces New CRT TV | TechHive|website=www.techhive.com}}</ref> | ||
CRTs were first replaced by LCD in developed markets such as Japan and Europe in the 2000s and continued to be popular in developing markets such as Latin America,<ref>{{Cite web|url=https://amp.smh.com.au/technology/lg-samsung-try-to-save-the-crt-20050819-gdlwh2.html|title=LG, Samsung try to save the CRT|website=amp.smh.com.au}}</ref><ref name="auto20"/> China, Asia and the Middle East due to their low price compared to contemporary flat panel TVs,<ref>{{Cite web|url=https://www.techradar.com/news/television/what-s-happening-to-all-the-crt-tvs-525649|title=What's happening to all the CRT TVs?|first=Dean Evans 06|last=February 2009|website=TechRadar}}</ref> and later in markets like rural India, however in around 2014 even rural markets started favoring LCD over CRT, leading to the demise of the technology.<ref>{{Cite web|url=https://www.thehindubusinessline.com/info-tech/Rise-of-flat-screen-televisions-lowers-the-curtain-on-the-bulky-box/article20921397.ece|title=Rise of flat-screen televisions lowers the curtain on the bulky box|first=R.|last=Ravikumar|website=@businessline}}</ref> | CRTs were first replaced by LCD in developed markets such as Japan and Europe in the 2000s and continued to be popular in developing markets such as Latin America,<ref>{{Cite web|url=https://amp.smh.com.au/technology/lg-samsung-try-to-save-the-crt-20050819-gdlwh2.html|title=LG, Samsung try to save the CRT|website=amp.smh.com.au}}</ref><ref name="auto20"/> China, Asia and the Middle East due to their low price compared to contemporary flat panel TVs,<ref>{{Cite web|url=https://www.techradar.com/news/television/what-s-happening-to-all-the-crt-tvs-525649|title=What's happening to all the CRT TVs?|first=Dean Evans 06|last=February 2009|website=TechRadar}}</ref> and later in markets like rural India, however in around 2014 even rural markets started favoring LCD over CRT, leading to the demise of the technology.<ref>{{Cite web|url=https://www.thehindubusinessline.com/info-tech/Rise-of-flat-screen-televisions-lowers-the-curtain-on-the-bulky-box/article20921397.ece|title=Rise of flat-screen televisions lowers the curtain on the bulky box|first=R.|last=Ravikumar|website=@businessline}}</ref> | ||
Despite being a mainstay of display technology for decades, CRT-based computer monitors and televisions are now virtually a dead technology. Demand for CRT screens dropped in the late 2000s. The rapid advances and falling prices of ] ] technology — first for computer monitors, and then for televisions — spelled doom for competing display technologies such as CRT, ], and ].<ref>{{cite news |last=Wong|first=May|title=Flat Panels Drive Old TVs From Market |publisher=AP via USA Today |date= 22 October 2006 |url=https://www.usatoday.com/tech/products/gear/2006-10-22-crt-demise_x.htm |accessdate=8 October 2006}}</ref> Efforts from Samsung and LG to make CRTs competitive with their LCD and plasma counterparts, offering slimmer and cheaper models to compete with similarly sized and more expensive LCDs<ref>{{Cite web|url=https://www.cnet.com/news/lg-philips-displays-ups-production-of-slim-crts/|title=LG.Philips Displays ups production of slim CRTs|first=Richard|last=Shim|website=CNET}}</ref><ref>{{Cite web|url=https://www.smh.com.au/technology/lg-samsung-try-to-save-the-crt-20050819-gdlwh2.html|title=LG, Samsung try to save the CRT|date=19 August 2005|website=The Sydney Morning Herald}}</ref><ref>{{Cite web|url=https://m.hexus.net/ce/news/audio-visual/4947-samsung-unveils-hdtv-compatible-crt/|title=Samsung unveils HDTV-compatible CRT - Audio Visual - News - HEXUS.net|website=m.hexus.net}}</ref><ref name="auto9">https://www.scmp.com/article/404922/philips-division-launches-slim-crts</ref><ref>{{Cite web|url=https://amp.smh.com.au/world/worlds-slimmest-crt-digital-tv-built-20040720-gdjdmo.html|title=World's slimmest CRT digital TV built|website=amp.smh.com.au}}</ref> CRTs eventually became obsolete and were relegated to developing markets once LCDs fell in price, with their lower bulk, weight and ability to be wall mounted coming as pluses. | Despite being a mainstay of display technology for decades, CRT-based computer monitors and televisions are now virtually a dead technology. Demand for CRT screens dropped in the late 2000s. The rapid advances and falling prices of ] ] technology — first for computer monitors, and then for televisions — spelled doom for competing display technologies such as CRT, ], and ].<ref>{{cite news |last=Wong|first=May|title=Flat Panels Drive Old TVs From Market |publisher=AP via USA Today |date= 22 October 2006 |url=https://www.usatoday.com/tech/products/gear/2006-10-22-crt-demise_x.htm |accessdate=8 October 2006}}</ref> Efforts from Samsung and LG to make CRTs competitive with their LCD and plasma counterparts, offering slimmer and cheaper models to compete with similarly sized and more expensive LCDs<ref>{{Cite web|url=https://www.cnet.com/news/lg-philips-displays-ups-production-of-slim-crts/|title=LG.Philips Displays ups production of slim CRTs|first=Richard|last=Shim|website=CNET}}</ref><ref>{{Cite web|url=https://www.smh.com.au/technology/lg-samsung-try-to-save-the-crt-20050819-gdlwh2.html|title=LG, Samsung try to save the CRT|date=19 August 2005|website=The Sydney Morning Herald}}</ref><ref>{{Cite web|url=https://m.hexus.net/ce/news/audio-visual/4947-samsung-unveils-hdtv-compatible-crt/|title=Samsung unveils HDTV-compatible CRT - Audio Visual - News - HEXUS.net|website=m.hexus.net}}</ref><ref name="auto9">{{cite web | title=Philips division launches slim CRTs | website=South China Morning Post | date=2003-01-28 | url=https://www.scmp.com/article/404922/philips-division-launches-slim-crts | language=id | access-date=2020-12-11}}</ref><ref>{{Cite web|url=https://amp.smh.com.au/world/worlds-slimmest-crt-digital-tv-built-20040720-gdjdmo.html|title=World's slimmest CRT digital TV built|website=amp.smh.com.au}}</ref> CRTs eventually became obsolete and were relegated to developing markets once LCDs fell in price, with their lower bulk, weight and ability to be wall mounted coming as pluses. | ||
Most high-end CRT production had ceased by around 2010,<ref>{{cite news |url=http://www.veritasetvisus.com/LCDTVA/LCDTVA-8,%20Spring-Summer%202009.pdf |title= The Standard TV|publisher= Veritas et Visus |accessdate=12 June 2008}}</ref> including high-end Sony and Panasonic product lines.<ref>{{cite news |url=http://www.signonsandiego.com/uniontrib/20060120/news_1n20sony.html |title=End of an era |newspaper=The San Diego Union-Tribune |date=20 January 2006 |accessdate=12 June 2008 |archive-url=https://web.archive.org/web/20080615135249/http://www.signonsandiego.com/uniontrib/20060120/news_1n20sony.html |archive-date=15 June 2008 |url-status=dead }}</ref><ref>{{cite news |url=http://www.engadgethd.com/2005/12/01/matsushita-says-good-bye-to-crts/ |title=Matsushita says good-bye to CRTs |publisher=engadgetHD |date=1 December 2005 |accessdate=12 June 2008 |url-status=dead |archive-url=https://web.archive.org/web/20090114110526/http://www.engadgethd.com/2005/12/01/matsushita-says-good-bye-to-crts/ |archive-date=14 January 2009}}</ref> In Canada and the United States, the sale and production of high-end CRT TVs ({{Convert|30|in|cm|adj=on}} screens) in these markets had all but ended by 2007. Just a couple of years later, inexpensive "combo" CRT TVs ({{Convert|20|in|cm|adj=on}} screens with an integrated VHS player) disappeared from discount stores. | Most high-end CRT production had ceased by around 2010,<ref>{{cite news |url=http://www.veritasetvisus.com/LCDTVA/LCDTVA-8,%20Spring-Summer%202009.pdf |title= The Standard TV|publisher= Veritas et Visus |accessdate=12 June 2008}}</ref> including high-end Sony and Panasonic product lines.<ref>{{cite news |url=http://www.signonsandiego.com/uniontrib/20060120/news_1n20sony.html |title=End of an era |newspaper=The San Diego Union-Tribune |date=20 January 2006 |accessdate=12 June 2008 |archive-url=https://web.archive.org/web/20080615135249/http://www.signonsandiego.com/uniontrib/20060120/news_1n20sony.html |archive-date=15 June 2008 |url-status=dead }}</ref><ref>{{cite news |url=http://www.engadgethd.com/2005/12/01/matsushita-says-good-bye-to-crts/ |title=Matsushita says good-bye to CRTs |publisher=engadgetHD |date=1 December 2005 |accessdate=12 June 2008 |url-status=dead |archive-url=https://web.archive.org/web/20090114110526/http://www.engadgethd.com/2005/12/01/matsushita-says-good-bye-to-crts/ |archive-date=14 January 2009}}</ref> In Canada and the United States, the sale and production of high-end CRT TVs ({{Convert|30|in|cm|adj=on}} screens) in these markets had all but ended by 2007. Just a couple of years later, inexpensive "combo" CRT TVs ({{Convert|20|in|cm|adj=on}} screens with an integrated VHS player) disappeared from discount stores. | ||
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CRTs' demise has made maintaining arcade machines made before the wide adoption of flat panel displays difficult, due to a lack of spare replacement CRTs. (CRTs may need replacement due to wear as explained further below) Repairing CRTs, although possible, requires a high level of skill.<ref name="auto65">{{Cite web|url=https://venturebeat.com/2017/03/03/what-the-death-of-the-crt-display-technology-means-for-classic-arcade-machines/|title=Donkey Kong's failing liver: What the death of the CRT display technology means for classic arcade machines|date=3 March 2017}}</ref> | CRTs' demise has made maintaining arcade machines made before the wide adoption of flat panel displays difficult, due to a lack of spare replacement CRTs. (CRTs may need replacement due to wear as explained further below) Repairing CRTs, although possible, requires a high level of skill.<ref name="auto65">{{Cite web|url=https://venturebeat.com/2017/03/03/what-the-death-of-the-crt-display-technology-means-for-classic-arcade-machines/|title=Donkey Kong's failing liver: What the death of the CRT display technology means for classic arcade machines|date=3 March 2017}}</ref> | ||
=== Current uses === | |||
While CRTs had declined dramatically in the late 2000s, they are still widely used by consumers and some industries. CRTs do have some distinct advantages over other newer technologies. | |||
Because a CRT doesn't need to draw a full image and instead uses ] lines, a CRT is faster than an LCD which draws the entire image. CRTs are also able to correctly display certain ], such as the 256x224 resolution of the ] (NES).<ref>{{Cite web|title=Nintendo Entertainment System Specs|url=https://www.cnet.com/products/nintendo-entertainment-system/|access-date=8 September 2020|website=CNET|language=en}}</ref> This is also an example of the most common usage of CRTs by consumers, retro video gaming. Some reasons for this include: | |||
*CRTs are able to correctly display the often 'oddball' resolutions that many older consoles use. | |||
*Pre-] were designed with CRTs completely in mind; even if a console could be displayed on an LCD, it would almost always look substantially better on a CRT. | |||
*CRTs have near zero input lag for pre-seventh generation consoles as compared to LCDs. | |||
Some industries still use CRTs because it is either too much effort, downtime, and/or cost to replace them, or there is no substitute available; a notable example is the airline industry. Planes such as the ] and the ] used CRT instruments in their ]s instead of mechanical instruments.<ref>{{Cite web|last=Pal|first=Soumyadeep|title=The Iconic Boeing 747 Heads Into The Sunset. An Enduring Legacy.|url=https://qnewshub.com/business/the-iconic-boeing-747-heads-into-the-sunset-an-enduring-legacy/|access-date=8 September 2020|website=QNewsHub|language=en-US}}</ref> Airlines such as ] still use CRT technology, which also uses ] for ].<ref>{{Cite web|date=11 August 2020|title=The Boeing 747-400 Is Still Updated With Floppy Disks - Here's Why|url=https://simpleflying.com/boeing-747-400-floppy-disk-updates/|access-date=8 September 2020|website=Simple Flying|language=en-US}}</ref> | |||
CRTs also tend to be more rugged than their flat panel counterparts,<ref name="auto105"/> although rugged LCDs also exist. | |||
====Comparison with other technologies==== | |||
{{main|Comparison of CRT, LCD, Plasma, and OLED displays}} | |||
*LCD advantages over CRT: Lower bulk, power consumption and heat generation, higher refresh rates (up to 360hz),<ref>{{Cite web|url=https://www.pcmag.com/reviews/asus-rog-swift-360hz-pg259qn|title=Asus ROG Swift 360Hz PG259QN Review|website=PCMAG}}</ref> higher contrast ratios | |||
*CRT advantages over LCD: Better color reproduction, no motion blur, multisyncing available in many monitors, no input lag<ref name="eurogamer"/> | |||
*OLED advantages over CRT: Lower bulk, similar color reproduction,<ref name="eurogamer"/> higher contrast ratios, similar refesh rates(over 60Hz, up to 120hz)<ref>{{Cite web|url=https://www.cnet.com/news/best-tv-for-ps5-and-xbox-series-x-series-s-in-2020-lg-oled-samsung-qled-sony-tcl-and-vizio/|title=Which TV is best for PS5 and Xbox Series X?|first=Geoffrey|last=Morrison|website=CNET}}</ref><ref>{{Cite web|url=https://www.rtings.com/tv/reviews/lg/c9-oled|title=LG C9 OLED Review (OLED55C9PUA, OLED65C9PUA, OLED77C9PUA)|website=RTINGS.com}}</ref><ref>{{Cite web|url=https://www.gizchina.com/2020/11/07/lg-admits-that-oled-tvs-will-have-problems-with-variable-refresh-rate-vrr-below-120-hz/|title=LG admits that OLED TVs will have problems with variable refresh rate (VRR) below 120 Hz|date=November 7, 2020|website=Gizchina.com}}</ref> but not on computer monitors,<ref>{{Cite web|url=https://www.displayninja.com/best-oled-monitor/|title=OLED Monitors In 2020 : Current Market Status|date=23 November 2020|website=DisplayNinja}}</ref> also suffers from motion blur<ref>{{Cite web|url=https://www.cnet.com/how-to/to-120hz-and-beyond-the-pros-and-cons-of-how-4k-tvs-reduce-motion-blur/|title=Motion blur on 4K TVs: What it is and how to fight it|first=Geoffrey|last=Morrison|website=CNET}}</ref> | |||
On CRTs, refresh rate depends on resolution, both of which are ultimately limited by the maximum horizontal scanning frequency of the CRT; motion blur also depends on the decay time of the phosphors; phosphors that decay too slowly for a given refresh rate may cause smearing or motion blur on the image. In practice CRTs are limited to a refresh rate of 160hz.<ref>{{Cite web|url=https://www.cnet.com/products/samsung-syncmaster-997mb-crt-monitor-19-series/|title=Samsung SyncMaster 997MB - CRT monitor - 19" Series Specs|website=CNET}}</ref> LCDs that can compete with OLED (Dual Layer, and mini-LED LCDs) are not available in high refresh rates, although quantum dot LCDs (QLEDs) are available in high refresh rates (up to 144Hz)<ref>{{Cite web|url=https://www.displayninja.com/samsung-c32hg70-review/|title=Samsung C32HG70 Review 2020: What You Need To Know|date=29 October 2020|website=DisplayNinja}}</ref> and are competitive in color reproduction with OLEDs.<ref>{{Cite web|url=https://www.cnet.com/news/samsung-qled-vs-lg-oled-how-the-two-best-tv-technologies-compare-in-2020/|title=QLED or OLED? We compare the two best TV technologies|first=David|last=Katzmaier|website=CNET}}</ref> | |||
CRT monitors can still outperform LCD and OLED monitors in input lag, as there is no signal processing between the CRT and the display connector of the monitor, since CRT monitors often use VGA which provides an analog signal that can be fed to a CRT directly. Video cards designed for use with CRTs may have a ] to generate the analog signals needed by the CRT.<ref>{{cite journal |last1=Kim |first1=Chul |title=Production of shadow-mask-improved technology |journal=Journal of Materials Processing Technology |date=3 October 2002 |volume=127 |issue=3 |pages=409–418 |doi=10.1016/s0924-0136(02)00435-1 }}</ref><ref name="auto105"/> Also, CRT monitors are often capable of displaying sharp images at several resolutions, an ability known as ].<ref>{{Cite web|url=https://www.nec-display.com/ap/en_display/25th/index.html|title=MultiSync 25th Anniversary - The Evolution of the MultiSync | NEC Display Solutions|website=www.nec-display.com}}</ref><ref>{{cite journal |last1=Bagher |first1=Askari Mohammad |last2=Vahid |first2=Mirzaei Mahmoud Abadi |last3=Mohsen |first3=Mirhabibi |title=A Review of Challenges in Display Technology |journal=International Journal of Electrical Components and Energy Conversion |date=19 May 2017 |volume=3 |issue=2 |pages=26 |doi=10.11648/j.ijecec.20170302.12 |doi-access=free }}</ref> Due to these reasons CRTs are sometimes preferred by PC gamers in spite of their bulk, weight and heat generation.<ref>{{cite web | last=Martindale | first=Jon | title=New Report States CRT Monitors Are Still Better Than Modern Gaming Displays | website=Digital Trends | date=2019-09-17 | url=https://www.digitaltrends.com/computing/crt-monitor-modern-gaming/ | access-date=2020-12-11}}</ref><ref name="eurogamer">{{Cite web|url=https://www.eurogamer.net/amp/digitalfoundry-2019-modern-games-look-beautiful-on-crt-monitors|title=We played modern games on a CRT monitor - and the results are phenomenal | Eurogamer|website=www.eurogamer.net}}</ref> | |||
==References== | ==References== |
Revision as of 23:06, 11 December 2020
Workspace
Hittorf observed that some unknown rays were emitted from the cathode (negative electrode) which could cast shadows on the glowing wall of the tube, indicating the rays were traveling in straight lines. In 1890, Arthur Schuster demonstrated cathode rays could be deflected by electric fields, and William Crookes showed they could be deflected by magnetic fields. In 1897, J. J. Thomson succeeded in measuring the charge-mass-ratio of cathode rays, showing that they consisted of negatively charged particles smaller than atoms, the first "subatomic particles", which had already been named electrons by Irish physicist, George Johnstone Stoney in 1891. The earliest version of the CRT was known as the "Braun tube", invented by the German physicist Ferdinand Braun in 1897. It was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen.
The first cathode-ray tube to use a hot cathode was developed by John Bertrand Johnson (who gave his name to the term Johnson noise) and Harry Weiner Weinhart of Western Electric, and became a commercial product in 1922. The introduction of hot cathodes allowed for lower acceleration anode voltages and higher electron beam currents, since the anode now only accelerated the electrons emitted by the hot cathode, and no longer had to have a very high voltage to induce electron emission from the cold cathode.
In 1926, Kenjiro Takayanagi demonstrated a CRT television that received images with a 40-line resolution. By 1927, he improved the resolution to 100 lines, which was unrivaled until 1931. By 1928, he was the first to transmit human faces in half-tones on a CRT display. By 1935, he had invented an early all-electronic CRT television.
It was named in 1929 by inventor Vladimir K. Zworykin, who was influenced by Takayanagi's earlier work. RCA was granted a trademark for the term (for its cathode-ray tube) in 1932; it voluntarily released the term to the public domain in 1950.
In the 1930s, Allen B. DuMont made the first CRTs to last 1,000 hours of use, which was one of the factors that led to the widespread adoption of television.
The first commercially made electronic television sets with cathode-ray tubes were manufactured by Telefunken in Germany in 1934.
From 1949 to the early 1960s there was a shift from circular CRTs to rectangular CRTs, although the first rectangular CRTs were made in 1938 by Telefunken. While circular CRTs were the norm, European TV sets often blocked portions of the screen to make it appear somewhat rectangular while American sets often left the entire front of the CRT exposed or only blocked the upper and lower portions of the CRT.
In 1954 RCA produced some of the first color CRTs, the 15GP22 CRTs used in the CT-100, the first color TV set to be mass produced. The first rectangular color CRT were also made in 1954. However, the first color rectangular CRTs to be offered to the public were made in 1963. One of the challenges that had to be solved to produce the rectangular color CRT was convergence at the corners of the CRT. In 1965, brighter rare earth phosphors began replacing dimmer and cadmium-containing red and green phosphors. Eventually blue phosphors were replaced as well.
The size of CRTs increased over time, from 19 inches in 1938, to 21 inches in 1955, 35 inches by 1985, and 43 inches by 1989. However, experimental 31 inch CRTs were made as far back as 1938.
In 1960 the Aiken tube was invented. It was a CRT in a flat panel display format with a single electron gun. Deflection was electrostatic and magnetic but due to patent problems it was never put into production. It was also envisioned as a Head-up display in aircraft. By the time patent issues were solved RCA had already invested heavily in conventional CRTs.
In 1987, flat screen CRTs were developed by Zenith for computer monitors, reducing reflections and helping increase image contrast and brightness. Such CRTs were expensive which limited their use to computer monitors. Attempts were made to produce flat screen CRTs using inexpensive and widely available float glass.
In 1990, the first CRTs with HD resolution were released to the market by Sony.
In the mid 1990s, some 160 million CRTs were made per year.
Flat panel displays dropped in price and started significantly displacing cathode-ray tubes in the 2000s. After several predictions, LCD monitor sales began exceeding those of CRTs in 2003-2004 and LCD TV sales started exceeding those of CRTs in the US in 2005, in Japan in 2005-2006, in Europe in 2006, globally in 2007-2008, and in India in 2013.
In the mid 2000s, Canon and Sony presented the Surface-conduction electron-emitter display and Field-emission displays, respectively. They both were flat panel displays that had one (SED) or several (FED) electron emitters per subpixel in place of electron guns; the electron emitters were placed on a sheet of glass and the electrons were accelerated to a nearby sheet of glass with phosphors using an anode voltage; the electrons were not focused making each subpixel essentially a flood gun CRT. They were never put into mass production as LCD technology was significantly cheaper, eliminating the market for such displays.
The last known manufacturer of (in this case, recycled) CRTs, Videocon, ceased in 2015. CRT TVs stopped being made around the same time.
In 2015, several CRT manufacturers were convicted in the US for price fixing. The same occurred in Canada in 2018.
Demise
Worldwide sales of CRT computer monitors peaked in 2000, at 90 million units, while those of CRT TVs peaked in 2005 at 130 million units.
Beggining in the late 90s to the early 2000s CRTs began to be replaced with LCDs, starting first with computer monitors smaller than 15 inches in size largely because of their lower bulk. Among the first manufacturers to stop CRT production was Hitachi, in 2001, followed by Sony in Japan in 2004, Thomson in the US in 2004, Matsushita Toshiba picture display in 2005 in the US, 2006 in Malaysia and 2007 in China, Sony in the US in 2006, Sony in Singapore and Malaysia for the Latin American and Asian markets in 2008, Samsung SDI in 2007 and 2012 and Cathode Ray Technology(formerly Philips) in 2012 and Videocon in 2015-16. Ekranas in Lithuania and LG.Philips Displays went bankrupt in 2005 and 2006 respectively. Matsushita Toshiba stopped in the US in 2004 due to losses of $109 million, and in Malaysia in 2006 due to losses that almost equaled their sales. The last CRT TVs at CES were shown by Samsung in 2007 and the last mass produced model was introduced by LG in 2008 for developing markets due to its low price. The last CRT TV by a major manufacturer was introduced by LG in 2010.
CRTs were first replaced by LCD in developed markets such as Japan and Europe in the 2000s and continued to be popular in developing markets such as Latin America, China, Asia and the Middle East due to their low price compared to contemporary flat panel TVs, and later in markets like rural India, however in around 2014 even rural markets started favoring LCD over CRT, leading to the demise of the technology.
Despite being a mainstay of display technology for decades, CRT-based computer monitors and televisions are now virtually a dead technology. Demand for CRT screens dropped in the late 2000s. The rapid advances and falling prices of LCD flat panel technology — first for computer monitors, and then for televisions — spelled doom for competing display technologies such as CRT, rear-projection, and plasma display. Efforts from Samsung and LG to make CRTs competitive with their LCD and plasma counterparts, offering slimmer and cheaper models to compete with similarly sized and more expensive LCDs CRTs eventually became obsolete and were relegated to developing markets once LCDs fell in price, with their lower bulk, weight and ability to be wall mounted coming as pluses.
Most high-end CRT production had ceased by around 2010, including high-end Sony and Panasonic product lines. In Canada and the United States, the sale and production of high-end CRT TVs (30-inch (76 cm) screens) in these markets had all but ended by 2007. Just a couple of years later, inexpensive "combo" CRT TVs (20-inch (51 cm) screens with an integrated VHS player) disappeared from discount stores.
Electronics retailers such as Best Buy steadily reduced store spaces for CRTs. In 2005, Sony announced that they would stop the production of CRT computer displays. Samsung did not introduce any CRT models for the 2008 model year at the 2008 Consumer Electronics Show; on 4 February 2008, they removed their 30" wide screen CRTs from their North American website and did not replace them with new models.
In the United Kingdom, DSG (Dixons), the largest retailer of domestic electronic equipment, reported that CRT models made up 80–90% of the volume of televisions sold at Christmas 2004 and 15–20% a year later, and that they were expected to be less than 5% at the end of 2006. Dixons ceased selling CRT televisions in 2006.
CRTs' demise has made maintaining arcade machines made before the wide adoption of flat panel displays difficult, due to a lack of spare replacement CRTs. (CRTs may need replacement due to wear as explained further below) Repairing CRTs, although possible, requires a high level of skill.
Current uses
While CRTs had declined dramatically in the late 2000s, they are still widely used by consumers and some industries. CRTs do have some distinct advantages over other newer technologies.
Because a CRT doesn't need to draw a full image and instead uses interlaced lines, a CRT is faster than an LCD which draws the entire image. CRTs are also able to correctly display certain resolutions, such as the 256x224 resolution of the Nintendo Entertainment System (NES). This is also an example of the most common usage of CRTs by consumers, retro video gaming. Some reasons for this include:
- CRTs are able to correctly display the often 'oddball' resolutions that many older consoles use.
- Pre-seventh generation video game consoles were designed with CRTs completely in mind; even if a console could be displayed on an LCD, it would almost always look substantially better on a CRT.
- CRTs have near zero input lag for pre-seventh generation consoles as compared to LCDs.
Some industries still use CRTs because it is either too much effort, downtime, and/or cost to replace them, or there is no substitute available; a notable example is the airline industry. Planes such as the Boeing 747-400 and the Airbus A320 used CRT instruments in their glass cockpits instead of mechanical instruments. Airlines such as Lufthansa still use CRT technology, which also uses floppy disks for navigation updates.
CRTs also tend to be more rugged than their flat panel counterparts, although rugged LCDs also exist.
Comparison with other technologies
Main article: Comparison of CRT, LCD, Plasma, and OLED displays- LCD advantages over CRT: Lower bulk, power consumption and heat generation, higher refresh rates (up to 360hz), higher contrast ratios
- CRT advantages over LCD: Better color reproduction, no motion blur, multisyncing available in many monitors, no input lag
- OLED advantages over CRT: Lower bulk, similar color reproduction, higher contrast ratios, similar refesh rates(over 60Hz, up to 120hz) but not on computer monitors, also suffers from motion blur
On CRTs, refresh rate depends on resolution, both of which are ultimately limited by the maximum horizontal scanning frequency of the CRT; motion blur also depends on the decay time of the phosphors; phosphors that decay too slowly for a given refresh rate may cause smearing or motion blur on the image. In practice CRTs are limited to a refresh rate of 160hz. LCDs that can compete with OLED (Dual Layer, and mini-LED LCDs) are not available in high refresh rates, although quantum dot LCDs (QLEDs) are available in high refresh rates (up to 144Hz) and are competitive in color reproduction with OLEDs.
CRT monitors can still outperform LCD and OLED monitors in input lag, as there is no signal processing between the CRT and the display connector of the monitor, since CRT monitors often use VGA which provides an analog signal that can be fed to a CRT directly. Video cards designed for use with CRTs may have a RAMDAC to generate the analog signals needed by the CRT. Also, CRT monitors are often capable of displaying sharp images at several resolutions, an ability known as multisyncing. Due to these reasons CRTs are sometimes preferred by PC gamers in spite of their bulk, weight and heat generation.
References
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- Bagher, Askari Mohammad; Vahid, Mirzaei Mahmoud Abadi; Mohsen, Mirhabibi (19 May 2017). "A Review of Challenges in Display Technology". International Journal of Electrical Components and Energy Conversion. 3 (2): 26. doi:10.11648/j.ijecec.20170302.12.
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