{"id":201805,"date":"2014-01-23T13:10:00","date_gmt":"2014-01-23T12:10:00","guid":{"rendered":"https:\/\/cms.galaxiemedia.fr\/tomshardware\/2014\/01\/23\/prise-en-main-de-lecran-28-pouces-4k-ultra-hd-de-dell-maj-il-est-limite-a-30-hz\/"},"modified":"2018-11-12T12:00:07","modified_gmt":"2018-11-12T11:00:07","slug":"prise-en-main-de-lecran-28-pouces-4k-ultra-hd-de-dell-maj-il-est-limite-a-30-hz","status":"publish","type":"post","link":"https:\/\/www.tomshardware.fr\/prise-en-main-de-lecran-28-pouces-4k-ultra-hd-de-dell-maj-il-est-limite-a-30-hz\/","title":{"rendered":"Prise en main de l&#8217;\u00e9cran 28 pouces 4K Ultra HD de Dell [MAJ : il est limit\u00e9 \u00e0 30 Hz]"},"content":{"rendered":"<p>Nos coll\u00e8gues am\u00e9ricains, au CES de Las Vegas, ont pu prendre en main l&#8217;\u00e9cran de 28 pouces 4K Ultra HD de Dell. Cet \u00e9cran est attendu au prix de 700 $, alors que les autres \u00e9crans Ultra HD d\u00e9passent all\u00e8grement ce prix \u2014 la version 32 pouces dont nous allons reparler vaut par exemple 2 700 \u20ac \u2014. Quelles sont les raisons de ce prix ?<\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 1 : Prise en main de l&#039;\u00e9cran 28 pouces 4K Ultra HD de Dell [MAJ : il est limit\u00e9 \u00e0 30 Hz]\" decoding=\"async\" width=\"755\" height=\"435\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2014\/01\/vlcsnap-2014-01-15-08h38m16s399-755x435.png\" class=\"attachment-purch-755 size-purch-755\" alt=\"\" \/><span class=\"imgCaption\">L&#8217;\u00e9cran de Dell<\/span><\/span><\/span><\/span><\/span><\/p>\n<\/p>\n<h3>Une dalle TN \u00e0 30 Hz<\/h3>\n<\/p>\n<p>Il y a deux raisons. La premi\u00e8re, c&#8217;est qu&#8217;il s&#8217;agit d&#8217;une dalle TN, dont les angles de vue sont assez faibles dans l&#8217;absolu. On est tr\u00e8s loin des possibilit\u00e9s des dalles IPS dans ce domaine, et l&#8217;effet est tr\u00e8s visible d\u00e8s qu&#8217;on se d\u00e9cale un peu du centre de l&#8217;\u00e9cran. Les dalles TN ont tout de m\u00eame quelques avantages, dont \u00e9videmment le prix mais aussi le temps de r\u00e9ponse et le taux de contraste, deux points faibles de l&#8217;IPS.<\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 2 : Prise en main de l&#039;\u00e9cran 28 pouces 4K Ultra HD de Dell [MAJ : il est limit\u00e9 \u00e0 30 Hz]\" decoding=\"async\" width=\"755\" height=\"435\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2014\/01\/vlcsnap-2014-01-15-08h38m42s251-755x435.png\" class=\"attachment-purch-755 size-purch-755\" alt=\"\" \/><span class=\"imgCaption\">Les angles de vue<\/span><\/span><\/span><\/span><\/span><\/p>\n<\/p>\n<p>Le second point g\u00eanant, \u00e0 confirmer lors des tests, c&#8217;est que l&#8217;\u00e9cran ne proposerait la d\u00e9finition de 3 840 x 2 160 qu&#8217;avec une fr\u00e9quence de rafra\u00eechissement de 30 Hz. Pour atteindre 60 Hz, il faudrait passer en 1080p, ce qui est \u00e9videmment un probl\u00e8me. La limitation, nous en avons d\u00e9j\u00e0 parl\u00e9, est g\u00e9n\u00e9ralement li\u00e9e \u00e0 la connexion utilis\u00e9e (le HDMI et le DisplayPort 1.1 n&#8217;ont pas la bande passante n\u00e9cessaire pour d\u00e9passer cette valeur) et il n&#8217;est pas certain qu&#8217;en utilisant une connectique adapt\u00e9e, comme le DisplayPort 1.2, il ne soit pas possible d&#8217;atteindre une d\u00e9finition de 3 840 x 2 160 \u00e0 60 Hz. <\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 3 : Prise en main de l&#039;\u00e9cran 28 pouces 4K Ultra HD de Dell [MAJ : il est limit\u00e9 \u00e0 30 Hz]\" decoding=\"async\" width=\"755\" height=\"435\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2014\/01\/vlcsnap-2014-01-15-08h38m29s167-755x435.png\" class=\"attachment-purch-755 size-purch-755\" alt=\"\" \/><span class=\"imgCaption\">La connectique<\/span><\/span><\/span><\/span><\/span><\/p>\n<\/p>\n<p>Pour le reste, l&#8217;\u00e9cran propose une connectique compl\u00e8te : deux prises DisplayPort (dont une prise utilisable pour le cha\u00eenage), une prise Mini DisplayPort, une prise HDMI et un hub USB 3.0 dot\u00e9 de trois ports.<\/p>\n<\/p>\n<p>La vid\u00e9o de nos coll\u00e8gues (en anglais).<\/p>\n<\/p>\n<div class=\"dService\" data-service=\"Video\" data-guid=\"en_US_Video_11340\"  datatype=\"video\" data-id=\"11340\"><\/div>\n<\/p>\n<p><strong>Mise \u00e0 jour<\/strong> : <a href=\"http:\/\/downloads.dell.com\/Manuals\/all-products\/esuprt_display_projector\/esuprt_Display\/dell-p2815q-monitor_User's%20Guide_en-us.pdf?c=us&amp;l=en&amp;cs=19&amp;s=dhs\">le manuel de l&#8217;\u00e9cran est en ligne<\/a>, et c&#8217;est donc confirm\u00e9, il est bien limit\u00e9 \u00e0 30 Hz en Ultra HD. Il est possible de travailler en 3 840 x 2 160 \u00e0 30 Hz seulement, que ce soit en DisplayPort, en Mini DisplayPort ou en HDMI. Une limitation tr\u00e8s g\u00eanante pour un \u00e9cran de ce prix.<\/p>\n<\/p>\n<p><span class=\"imgContent imgCenter\"><span class=\"imgWrapperOutter\"><span class=\"imgWrapperInner\"><span class=\"iZoom\"><img alt=\"Image 4 : Prise en main de l&#039;\u00e9cran 28 pouces 4K Ultra HD de Dell [MAJ : il est limit\u00e9 \u00e0 30 Hz]\" decoding=\"async\" width=\"200\" height=\"72\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2014\/01\/capture-d-ecran-2014-01-23-a-12-14-54-200x72.png\" class=\"attachment-purch-200 size-purch-200\" alt=\"\" \/><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nos coll\u00e8gues am\u00e9ricains, au CES de Las Vegas, ont pu prendre en main l'\u00e9cran de 28 pouces 4K Ultra HD de Dell.<\/p>","protected":false},"author":36,"featured_media":201806,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[487],"tags":[839],"hubs":[],"acf":{"post_show_excerpt":false,"post_source":{"title":"Tom's Hardware","url":"https:\/\/www.tomshardware.com\/news\/dell-p2815q-28-inch-4k-monitor,25757.html","target":""}},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Prise en main de l&#039;\u00e9cran 28 pouces 4K Ultra HD de Dell [MAJ : il est limit\u00e9 \u00e0 30 Hz]<\/title>\n<meta name=\"description\" content=\"Nos coll\u00e8gues am\u00e9ricains, au CES de Las Vegas, ont pu prendre en main l&#039;\u00e9cran de 28 pouces 4K Ultra HD de Dell.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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