{"id":101880,"date":"2020-03-19T13:21:30","date_gmt":"2020-03-19T12:21:30","guid":{"rendered":"http:\/\/riverdi.com\/blog\/linterface-daffichage-parallele-rvb-expliquee\/"},"modified":"2024-05-20T11:03:16","modified_gmt":"2024-05-20T09:03:16","slug":"linterface-daffichage-parallele-rvb-expliquee","status":"publish","type":"post","link":"https:\/\/riverdi.com\/fr\/blog\/linterface-daffichage-parallele-rvb-expliquee","title":{"rendered":"L&rsquo;interface d&rsquo;affichage parall\u00e8le RVB expliqu\u00e9e"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #002175;color:#002175\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #002175;color:#002175\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/riverdi.com\/fr\/blog\/linterface-daffichage-parallele-rvb-expliquee\/#Principe_de_fonctionnement_de_lecran_TFT\" >Principe de fonctionnement de l&rsquo;\u00e9cran TFT<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/riverdi.com\/fr\/blog\/linterface-daffichage-parallele-rvb-expliquee\/#Generer_une_couleur_specifique_pour_un_pixel\" >G\u00e9n\u00e9rer une couleur sp\u00e9cifique pour un pixel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/riverdi.com\/fr\/blog\/linterface-daffichage-parallele-rvb-expliquee\/#De_quoi_est_faite_une_interface_parallele_RVB\" >De quoi est faite une interface parall\u00e8le RVB ?<\/a><\/li><\/ul><\/nav><\/div>\n<p id=\"E351\"><span id=\"E352\">Dans cet article de <a href=\"https:\/\/riverdi.com\/category\/display-101\">Display 101<\/a>, nous discutons de <strong>la <\/strong><\/span><strong><br \/>\n  <span id=\"E353\">parall\u00e8le num\u00e9rique <\/span><br \/>\n<\/strong><span id=\"E354\"><strong>RVB<\/strong> et de la mani\u00e8re dont les signaux de commande des lignes et des colonnes sont g\u00e9n\u00e9r\u00e9s \u00e0 partir de l&rsquo;interface RVB parall\u00e8le num\u00e9rique.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Principe_de_fonctionnement_de_lecran_TFT\"><\/span>Principe de fonctionnement de l&rsquo;\u00e9cran TFT<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tout d&rsquo;abord, pr\u00e9sentons le <a href=\"https:\/\/riverdi.com\/blog\/modules-daffichage-lcd-tft-theorie-caracteristiques-speciales-comparaison-tn-tft-vs-ips-lcd-riverdi\">principe de fonctionnement de base d&rsquo;un \u00e9cran TFT<\/a>.<\/p>\n<p>Un \u00e9cran LCD est constitu\u00e9 d&rsquo;un r\u00e9seau de segments \u00e0 cristaux liquides. Le cristal lui-m\u00eame n&rsquo;\u00e9met pas de lumi\u00e8re. En l&rsquo;absence de champ \u00e9lectrique, les cristaux s&rsquo;organisent de mani\u00e8re al\u00e9atoire. Lorsqu&rsquo;un champ \u00e9lectrique est appliqu\u00e9, les cristaux s&rsquo;alignent sur le champ \u00e9lectrique. Les diff\u00e9rentes intensit\u00e9s des champs \u00e9lectriques fonctionnent comme une \u00ab\u00a0porte\u00a0\u00bb pour faire passer diff\u00e9rentes intensit\u00e9s de lumi\u00e8re \u00e0 travers les cristaux. Si les cristaux sont align\u00e9s perpendiculairement au r\u00e9tro\u00e9clairage, ce dernier ne peut pas passer \u00e0 travers les cristaux. [1]<\/p>\n<p>Du point de vue de la structure \u00e9lectronique, un \u00e9cran LCD est constitu\u00e9 d&rsquo;une grille de signaux \u00e9lectriques. Les pixels sont adress\u00e9s par une matrice o\u00f9 chaque interaction appartient \u00e0 un pixel. Chaque pixel est connect\u00e9 perpendiculairement \u00e0 la ligne et \u00e0 la colonne par l&rsquo;interm\u00e9diaire d&rsquo;un transistor. Lorsque la ligne et la colonne sont s\u00e9lectionn\u00e9es par un contr\u00f4leur IC, le pixel r\u00e9pondant \u00e0 l&rsquo;interaction de la ligne et de la colonne est activ\u00e9 ou d\u00e9sactiv\u00e9.<span id=\"E385\"> <\/span><span id=\"E386\">[2]<\/span><\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.1.jpg\"><img decoding=\"async\" class=\"aligncenter wp-image-12351 size-large\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.1.jpg\" alt=\"RVB\" width=\"1024\" height=\"611\"><\/a><\/p>\n<p style=\"text-align: center\"><em><span id=\"E406\">Figure 1.1 La structure \u00e9lectronique d&rsquo;un \u00e9cran LCD <\/span><span id=\"E407\">[2]<\/span><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Generer_une_couleur_specifique_pour_un_pixel\"><\/span>G\u00e9n\u00e9rer une couleur sp\u00e9cifique pour un pixel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Comment g\u00e9n\u00e9rer une couleur sp\u00e9cifique pour un pixel ? Chaque pixel est compos\u00e9 de trois segments qui passent individuellement la lumi\u00e8re \u00e0 travers un filtre rouge, vert et bleu, pour former un pixel de couleur RVB. Pour un \u00e9cran TFT RVB 320*240, il y a 960 (320*3) colonnes et 240 lignes.<span id=\"E419\"><\/span><\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.2.jpg\"><img decoding=\"async\" class=\"wp-image-12350 size-large aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.2.jpg\" alt=\"RVB\" width=\"1024\" height=\"611\"><\/a><\/p>\n<p style=\"text-align: center\"><em><span id=\"E437\">Figure 1.2<\/span><span id=\"E438\"> Disposition matricielle des pixels d&rsquo;un \u00e9cran LCD RVB <\/span><span id=\"E439\">[2]<\/span><\/em><\/p>\n<p>La plupart des \u00e9crans LCD disposent d&rsquo;une interface num\u00e9rique parall\u00e8le RVB. Il fonctionne entre le contr\u00f4leur graphique en tant que source de signal et l&rsquo;entr\u00e9e du module d&rsquo;affichage RVB.<\/p>\n<p>L&rsquo;interface RVB permet d&rsquo;envoyer les informations relatives aux donn\u00e9es de l&rsquo;image (niveau de gris et couleur) en temps r\u00e9el.<\/p>\n<p>Les donn\u00e9es de l&rsquo;image sont transmises num\u00e9riquement sous forme de \u00ab\u00a00\u00a0\u00bb ou de \u00ab\u00a01\u00a0\u00bb par des niveaux de tension TTL. Pour l&rsquo;interface RVB, chaque signal a une ligne correspondante. Les connexions de signaux de l&rsquo;interface d&rsquo;affichage LCD RVB de 24 bits par pixel sont indiqu\u00e9es ci-dessous.<\/p>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.3.jpg\"><img decoding=\"async\" class=\"wp-image-12353 size-full aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.3.jpg\" alt=\"\" width=\"590\" height=\"353\"><\/a><\/p>\n<p id=\"E468\" style=\"text-align: center\"><em><span id=\"E469\">Figure 1.3 Exemple de connexions de signaux TFT (24bpp) via l&rsquo;interface parall\u00e8le RGB <\/span><span id=\"E470\">[2]<\/span><\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"De_quoi_est_faite_une_interface_parallele_RVB\"><\/span>De quoi est faite une interface parall\u00e8le RVB ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p id=\"E471\"><span id=\"E472\">L&rsquo;interface num\u00e9rique parall\u00e8le RVB comprend les \u00e9l\u00e9ments suivants <\/span><span id=\"E473\">de base <\/span><span id=\"E474\">signaux de synchronisation suivants : <\/span><span id=\"E475\">[3]<\/span><\/p>\n<ul>\n<li id=\"E476\" class=\"qowt-li-4_0 qowt-list qowt-stl-ListParagraph\"><span id=\"E477\">VSYNC (Vertical Sync for TFT) est utilis\u00e9 pour r\u00e9initialiser une nouvelle image.  <\/span><\/li>\n<li id=\"E478\" class=\"qowt-li-4_0 qowt-list qowt-stl-ListParagraph\"><span id=\"E479\">HSYNC (Horizontal Sync for TFT) est utilis\u00e9 pour r\u00e9initialiser la ligne ou la rang\u00e9e suivante de l&rsquo;\u00e9cran LCD.<\/span><\/li>\n<li id=\"E480\" class=\"qowt-li-4_0 qowt-list qowt-stl-ListParagraph\"><span id=\"E481\">D0&#8230;.<\/span><span id=\"E483\">dXX<\/span><span id=\"E485\"> (chaque bit a une ligne distincte).<\/span><\/li>\n<li id=\"E486\" class=\"qowt-li-4_0 qowt-list qowt-stl-ListParagraph\"><span id=\"E487\">LCDCLK (horloge LCD) est utilis\u00e9 pour synchroniser les donn\u00e9es de niveau de gris.<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.4.jpg\"><img decoding=\"async\" class=\"wp-image-12354 size-full aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2020\/03\/Figure-1.4.jpg\" alt=\"\" width=\"824\" height=\"456\"><\/a><\/p>\n<p style=\"text-align: center\"><em><span id=\"E506\">Figure 1.4. Les param\u00e8tres de synchronisation de la trame et de la ligne d&rsquo;un  <\/span><span id=\"E507\">interface parall\u00e8le RGB<\/span><span id=\"E508\"> [2]<\/span><\/em><\/p>\n<p id=\"E509\"><span id=\"E510\">T<\/span><span id=\"E512\">e <\/span> <span id=\"E513\">synchronisation verticale VSYNC d\u00e9finit le d\u00e9but d&rsquo;une nouvelle trame. Il n&rsquo;y a pas de donn\u00e9es d&rsquo;image pendant  <\/span><span id=\"E514\">l&rsquo;impulsion de synchronisation VSYNC <\/span><span id=\"E515\">l&rsquo;impulsion de synchronisation<\/span><span id=\"E516\"> qui sont marqu\u00e9es par VBP et VFP. <\/span><span id=\"E517\">[3]<\/span><\/p>\n<p id=\"E518\"><span id=\"E519\">Le m\u00eame principe s&rsquo;applique \u00e0 l&rsquo;impulsion de synchronisation HSYNC <\/span><span id=\"E521\">HSYNC<\/span><span id=\"E523\">Les donn\u00e9es de l&rsquo;enqu\u00eate sur l&rsquo;immigration et la protection des r\u00e9fugi\u00e9s, marqu\u00e9es par le HBP et le HFP, sont \u00e9galement disponibles. L&rsquo;impulsion HSYNC est responsable d&rsquo;une nouvelle ligne.  <\/span><span id=\"E524\">Entre deux <\/span><span id=\"E526\">HSync<\/span><span id=\"E528\"> les donn\u00e9es de couleur RVB en niveau de gris d&rsquo;une ligne doivent \u00eatre transmises.<\/span><span id=\"E529\"> [4]<\/span><\/p>\n<p id=\"E530\"><span id=\"E531\">Comme l&rsquo;\u00e9cran TFT peut piloter 3 segments (1 pixel) par horloge, <\/span><span id=\"E532\">la longueur de <\/span><span id=\"E533\">LCDCLK est d\u00e9termin\u00e9e par le nombre de<\/span><span id=\"E534\"> de colonnes de la r\u00e9solution.<\/span><\/p>\n<p id=\"E535\"><span id=\"E536\"> <\/span><span id=\"E537\">Par exemple<\/span><span id=\"E538\">, <\/span><span id=\"E539\">la r\u00e9solution d&rsquo;un \u00e9cran TFT est de <\/span><span id=\"E540\">480*272<\/span><span id=\"E541\">et nous supposons les param\u00e8tres suivants : <\/span><span id=\"E542\">[2]<\/span><\/p>\n<div class=\"table-1\">\n<table width=\"100%\">\n<thead>\n<tr>\n<th align=\"left\"><strong>Calendrier vertical<\/strong><\/th>\n<th align=\"left\"><\/th>\n<th align=\"left\"><strong>Calendrier horizontal<\/strong><\/th>\n<th align=\"left\"><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\">VFP &amp; VBP<\/td>\n<td align=\"left\">2 lignes<\/td>\n<td align=\"left\">H F P &amp; HBP<\/td>\n<td align=\"left\">2 horloges<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Largeur VSYNC<\/td>\n<td align=\"left\">10 lignes<\/td>\n<td align=\"left\">Largeur HSYNC<\/td>\n<td align=\"left\">41 horloges<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">P\u00e9riode verticale<\/td>\n<td align=\"left\">272 lignes<br \/>\n(r\u00e9solution verticale = 272 pixels)<\/td>\n<td align=\"left\">P\u00e9riode horizontale<\/td>\n<td align=\"left\">480 horloges<br \/>\n(r\u00e9solution horizontale = 480 pixels)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p id=\"E603\"><span id=\"E604\">Sur la base de la figure 1.3, nous pouvons obtenir :<\/span><\/p>\n<ul>\n<li id=\"E605\"><span id=\"E606\">Une seule ligne n\u00e9cessite (2 + 2 + 41 + 480) horloges = 525 horloges\/ligne<\/span><\/li>\n<li id=\"E607\"><span id=\"E608\">Un cadre complet n\u00e9cessite (2 + 2 + 10 + 272) lignes = 286 lignes\/cadre  <\/span><\/li>\n<li><span id=\"E610\">Une image compl\u00e8te en horloges = 286 * 525 = 150150 horloges\/image  <\/span><\/li>\n<\/ul>\n<p id=\"E611\"><span id=\"E612\">Pour une vitesse d&rsquo;horloge de <\/span><span id=\"E613\">7,83 MHz<\/span><span id=\"E614\">l&rsquo;\u00e9cran RGB <\/span><span id=\"E615\">serait rafra\u00eechi \u00e0 7,83M\/150,15K = 52,1Hz.<\/span><\/p>\n<hr>\n<p id=\"E617\"><span id=\"E618\">R\u00e9f\u00e9rences :  <\/span><\/p>\n<p id=\"E619\"><span id=\"E620\">[1] :<\/span><span id=\"E621\"> <\/span><span id=\"E622\">Comment fonctionne le TFT. <\/span><a id=\"E623\" href=\"https:\/\/www.tomshardware.com\/reviews\/tft-guide,114-4.html\" target=\"_blank\" rel=\"noopener noreferrer\"><br \/>\n  <span id=\"E624\" class=\"qowt-stl-Hyperlink\">https:\/\/www.tomshardware.com\/reviews\/tft-guide,114-4.html<\/span><br \/>\n<\/a><\/p>\n<p id=\"E625\"><span id=\"E626\">[2] :<\/span><span id=\"E627\">  Philips. \u00ab\u00a0Introduction aux technologies graphiques et LCD<\/span><\/p>\n<p id=\"E628\"><span id=\"E629\">[<\/span><span id=\"E630\">3<\/span><span id=\"E631\">] :<\/span><span id=\"E632\"> <\/span><span id=\"E633\">Chen, <\/span><span id=\"E635\">Janglin<\/span><span id=\"E637\">Wayne <\/span><span id=\"E639\">Cranton<\/span><span id=\"E641\">et Mark <\/span><span id=\"E643\">Fihn<\/span><span id=\"E645\">, eds. Manuel de la technologie de l&rsquo;affichage visuel. Berlin\/Heidelberg, Allemagne : Springer, 2016.<\/span><\/p>\n<p id=\"E646\"><span id=\"E647\"> <\/span><span id=\"E648\">[<\/span><span id=\"E649\">4<\/span><span id=\"E650\">] :<\/span><span id=\"E651\"> <\/span><span id=\"E652\">Watkinson J, Rumsey F (2003) Chapitre 3 : Transmission num\u00e9rique, Chapitre 7 : Interfaces vid\u00e9o num\u00e9riques. In : Manuel des interfaces num\u00e9riques. Focale,  <\/span><span id=\"E654\">Burlingto<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cet article de Display 101 traite de l&rsquo;interface num\u00e9rique parall\u00e8le RVB et de la mani\u00e8re dont les signaux de pilotage des lignes et des colonnes sont g\u00e9n\u00e9r\u00e9s \u00e0 partir de l&rsquo;interface num\u00e9rique parall\u00e8le RVB.<\/p>\n","protected":false},"author":19,"featured_media":100403,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[1457],"tags":[823,914,560],"class_list":["post-101880","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-affichage-101","tag-apprendre","tag-rvb","tag-semaine-de-laffichage"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L&#039;interface d&#039;affichage parall\u00e8le RVB expliqu\u00e9e - 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