{"id":6542,"date":"2023-05-31T06:27:25","date_gmt":"2023-05-31T06:27:25","guid":{"rendered":"https:\/\/www.alltouchdisplay.com\/?p=6542"},"modified":"2023-05-31T06:27:26","modified_gmt":"2023-05-31T06:27:26","slug":"what-is-tn-lcd-twist-nematic-liquid-crystal-display","status":"publish","type":"post","link":"https:\/\/www.alltouchdisplay.com\/what-is-tn-lcd-twist-nematic-liquid-crystal-display\/","title":{"rendered":"What is TN LCD (Twist Nematic Liquid Crystal Display) ?\ufffc"},"content":{"rendered":"\n<p>Fully understand TN LCD (Twist Nematic Liquid Crystal Display) technology, we will understand what is nematic liquid crystal first.<\/p>\n\n\n\n<h2>What is Nematic Liquid Crystal?<\/h2>\n\n\n\n<p>All of us know that water (chemical formula is H2O )has 3 states: Solid (ice), Liquid(water) and Gas(Vapor).&nbsp;<strong>Liiquid state is isotropic, which means that its properties are uniform in all directions\u2014 the result of H<\/strong><strong>2<\/strong><strong>O molecules being in constant random motion.&nbsp;<\/strong>Solid state is crystalline, all the H2O molecules have their fixed position, is anisotropic; optical- and other properties such as thermal and electrical conductivity vary with direction.<\/p>\n\n\n\n<p><strong>The Nematic liquid crystal state is a unique state not included in the above 3 states<\/strong>. It is a state between the crystalline (solid) and isotropic (liquid) states. Even in the state of liquid crystals, there are several types of liquid crystal states, as below.<\/p>\n\n\n\n<h2>Nematic Phase<\/h2>\n\n\n\n<p>The nematic liquid crystal phase is characterized by molecules maintain the general order of tending to point in the same direction. It has one dimensional order. See Fig.1<\/p>\n\n\n\n<h2>Smectic Phase<\/h2>\n\n\n\n<p>In smectic phase, molecules show two-dimensional order not present in the nematic. The molecules maintain the general orientationally of nematic, but also tend to align themselves in layers or planes. It is the state between nematic (one-dimensional order) and solid state (three-dimensional order). See Fig.1.<\/p>\n\n\n\n<h2>Cholesteric Phase<\/h2>\n\n\n\n<p>The cholesteric (or chiral nematic) liquid crystal phase is typically the molecules are directionally oriented and stacked in a helical pattern, with each layer rotated at a slight angle to the ones above and below it. See Fig.1.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img width=\"706\" height=\"384\" src=\"https:\/\/www.alltouchdisplay.com\/wp-content\/uploads\/2023\/05\/Picture-13222.jpg\" alt=\"\" class=\"wp-image-6543\" srcset=\"https:\/\/www.alltouchdisplay.com\/wp-content\/uploads\/2023\/05\/Picture-13222.jpg 706w, https:\/\/www.alltouchdisplay.com\/wp-content\/uploads\/2023\/05\/Picture-13222-300x163.jpg 300w, https:\/\/www.alltouchdisplay.com\/wp-content\/uploads\/2023\/05\/Picture-13222-600x326.jpg 600w, https:\/\/www.alltouchdisplay.com\/wp-content\/uploads\/2023\/05\/Picture-13222-64x35.jpg 64w\" sizes=\"(max-width: 706px) 100vw, 706px\" \/><figcaption><strong>Fig.1. Nematic, Smectic and Cholesteric Phases<\/strong><\/figcaption><\/figure>\n\n\n\n<p>In LCD display technology,\u00a0<strong>only nematic liquid crystal has practically use and cholesteric liquid crystal is doped with small amount to help nematic liquid crystal molecules to twist<\/strong>. That is the origin of the term \u201cTwisted Nematic\u201d or TN for Nematic Display in short.\u00a0\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fully understand TN LCD (Twist Nematic Liquid Crystal Display) technology, we will understand what is nematic liquid crystal first.<\/p>\n","protected":false},"author":1,"featured_media":6543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[67],"tags":[205,237,238,325,326],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.10 - 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