{"id":904,"date":"2022-01-27T01:58:51","date_gmt":"2022-01-27T01:58:51","guid":{"rendered":"http:\/\/learnlearn.uk\/igcsecs\/?page_id=904"},"modified":"2022-02-10T06:43:24","modified_gmt":"2022-02-10T06:43:24","slug":"projectors","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/igcsecs\/projectors\/","title":{"rendered":"Projectors"},"content":{"rendered":"<div class=\"responsive-tabs\">\n<h2 class=\"tabtitle\">LCD Projectors<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Liquid Crystal Display Projectors<\/h3>\n<div class=\"nv-iframe-embed\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=CepqasFRxxw\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"How LCD Projectors Work\" title=\"Play video &quot;How LCD Projectors Work&quot;\">https:\/\/www.youtube.com\/watch?v=CepqasFRxxw<\/a><noscript>Video can&#8217;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=CepqasFRxxw\" title=\"How LCD Projectors Work\">How LCD Projectors Work (https:\/\/www.youtube.com\/watch?v=CepqasFRxxw)<\/a><\/noscript><\/div>\n<\/div>\n<p>Can&#8217;t access YouTube at school\/college? <a href=\"https:\/\/drive.google.com\/file\/d\/1PxiO3QDe_U6tZAdo-9YacofcnWU7Oz2D\/view?usp=sharing\">Watch the Google Drive version instead.<\/a><\/p>\n<h3>How LCD Projectors Work<\/h3>\n<p>LCD Projectors use a combination of dichroic mirrors and and transmissive LCD arrays to display full color imagery. The basic steps in the process are:<\/p>\n<ol>\n<li>A single bright light source is split into separate colors (wavelengths) using dichroic mirrors<\/li>\n<li>The separate colors pass through an array of individually polarised LCD pixels<\/li>\n<li>The separate colors are combined into a single light source using a dichroic prism<\/li>\n<li>The light passes through a magnifying lens and is projected onto a separate screen, usually about 3-5 metres from the projector.<\/li>\n<\/ol>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-965\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/ezgif.com-gif-maker-1.gif\" alt=\"\" width=\"786\" height=\"616\" \/><\/p>\n<h3>\u00a0LCD Arrays<\/h3>\n<p>Liquid Crystal Displays contain a grid of millions of tiny semi-transparent pixels that allow light to be transmitted though, hence they are <strong>transmissive<\/strong> by nature. Voltages applied to the individual pixels change the polarization of the pixel and as a result alter the transparency of the pixel.<\/p>\n<p>When light is shone through the array different amounts of light pass through different pixels, this allows an image to be formed. Each red, green and blue channel of the image are created separately and all three channels are combined using a dichroic prism.<\/p>\n<div id=\"attachment_960\" style=\"width: 572px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-960\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-960\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/lcd-polarizing-array-compressed.gif?_t=1644394750\" alt=\"\" width=\"562\" height=\"245\" \/><p id=\"caption-attachment-960\" class=\"wp-caption-text\">The pixels within an LCD array change their transparency depending on the voltage applied.<\/p><\/div>\n<div id=\"attachment_969\" style=\"width: 760px\" class=\"wp-caption alignnone\"><img aria-describedby=\"caption-attachment-969\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-969 size-large\" src=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/3-channels-combined-into-a-single-image-1024x561.png?_t=1644395321\" alt=\"\" width=\"750\" height=\"411\" srcset=\"https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/3-channels-combined-into-a-single-image-1024x561.png 1024w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/3-channels-combined-into-a-single-image-300x164.png 300w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/3-channels-combined-into-a-single-image-768x420.png 768w, https:\/\/learnlearn.uk\/igcsecs\/wp-content\/uploads\/sites\/23\/2022\/01\/3-channels-combined-into-a-single-image.png 1169w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><p id=\"caption-attachment-969\" class=\"wp-caption-text\">The three separate color channels are combined using a dichroic prism to create a single color image<\/p><\/div>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">DLP Projectors<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Digital Light Projector<\/h3>\n<div class=\"nv-iframe-embed\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/youtu.be\/hWtdxl6viIg\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"How DLP Projectors Work\" title=\"Play video &quot;How DLP Projectors Work&quot;\">https:\/\/youtu.be\/hWtdxl6viIg<\/a><noscript>Video can&#8217;t be loaded because JavaScript is disabled: <a href=\"https:\/\/youtu.be\/hWtdxl6viIg\" title=\"How DLP Projectors Work\">How DLP Projectors Work (https:\/\/youtu.be\/hWtdxl6viIg)<\/a><\/noscript><\/div>\n<\/div>\n<p>YouTube blocked at school or college? <a href=\"https:\/\/drive.google.com\/file\/d\/1mcT5MThXIhdkumlv4vSoZ9J6NO_IiMab\/view?usp=sharing\">Watch the Google Drive version<\/a><\/p>\n<p>Digital Light Projectors use a combination of a spinning color wheel, together with a array of millions of tiny, movable mirrors to produce images and video to be displayed.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">LED Projectors<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Light Emitting Diode Projectors<\/h3>\n\n<\/div><h2 class=\"tabtitle\">Resources<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Resources<\/h3>\n<p><a href=\"https:\/\/docs.google.com\/presentation\/d\/1gV7Z6-g9E7IaaYDoHc9z_a-TwqiQ4-MB7RVHzsc7fvI\/edit?usp=sharing\">LCD Projectors Teacher Presentation<\/a><\/p>\n<p><a href=\"https:\/\/docs.google.com\/presentation\/d\/17E-lVPt4mOWRrzeKGLbskmT9ZOqDsxL3a3neNEGWqVE\/edit?usp=sharing\">DLP Projectors Teacher Presentation<\/a><\/p>\n<p><a href=\"https:\/\/scratch.mit.edu\/projects\/641190903\/\">LCD Scratch Animation (can be used as a lesson\/homework task)<\/a><\/p>\n<p><a href=\"https:\/\/scratch.mit.edu\/projects\/641887207\">DLP Scratch Animation (can be used as a lesson \/ homework task)<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Liquid Crystal Display Projectors https:\/\/www.youtube.com\/watch?v=CepqasFRxxwVideo can&#8217;t be loaded because JavaScript is disabled: How LCD Projectors Work (https:\/\/www.youtube.com\/watch?v=CepqasFRxxw) Can&#8217;t access YouTube at school\/college? Watch the Google Drive version instead. How LCD Projectors Work LCD Projectors use a combination of dichroic mirrors and and transmissive LCD arrays to display full color imagery. The basic steps in the&hellip;&nbsp;<a href=\"https:\/\/learnlearn.uk\/igcsecs\/projectors\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Projectors<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Projectors | IGCSE Computer Science | Learnlearn.uk<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/igcsecs\/projectors\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Projectors | IGCSE Computer Science | Learnlearn.uk\" \/>\n<meta property=\"og:description\" content=\"Liquid Crystal Display Projectors https:\/\/www.youtube.com\/watch?v=CepqasFRxxwVideo can&#8217;t be loaded because JavaScript is disabled: How LCD Projectors Work (https:\/\/www.youtube.com\/watch?v=CepqasFRxxw) Can&#8217;t access YouTube at school\/college? 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Watch the Google Drive version instead. How LCD Projectors Work LCD Projectors use a combination of dichroic mirrors and and transmissive LCD arrays to display full color imagery. 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