{"product_id":"4-inch-wide-temperature-lcd-display-30-c-to-80-c-720-720-ttl-high-brightness-650nits-tft-lcd-display-with-capacitive-touch","title":"4 Inch Wide Temperature LCD Display -30°C to 80°C 720×720 TTL High Brightness 650nits TFT LCD Display With Capacitive Touch","description":"\u003cp\u003e\u003cimg class=\"alignnone size-full wp-image-36534\" src=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/%E5%AE%BD%E6%B8%A9%E8%AF%A6%E6%83%85%E9%A1%B5_03-1.jpg.webp\" alt=\"\" width=\"930\" height=\"123\" srcset=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/宽温详情页_03-1.jpg.webp 930w, https:\/\/www.youritech.com\/uploads\/2026\/03\/宽温详情页_03-1-768x102.jpg.webp 768w\" sizes=\"(max-width: 930px) 100vw, 930px\"\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003e4 Inch Wide Temperature LCD Display \u003c\/span\u003e\u003cspan class=\"magic-8\"\u003e\u003cspan class=\"magic-9\"\u003e\u003cspan\u003eOverview\u003c\/span\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003eET040HD21-KT is a 4-inch diagonal TFT-LCD display module, featuring a transmissive display mode. ET040HD21-KT supports a resolution of 720×720, delivering clear and bright image performance with a square aspect ratio. It adopts a TTL interface for reliable signal transmission, with pixels arranged to ensure stable and consistent visual output. The module features an active area of 71.93(W) × 71.93(H) mm and an outline size of 84(W) × 85.99(H) mm. ET040HD21-KT provides a typical brightness of 650 cd\/m² and supports wide viewing angles of 85° in all directions (L\/R\/U\/D). Designed for wide temperature environments, it operates from -30°C to 80°C with storage support up to -30°C to 85°C, and it is integrated with a capacitive touch panel for touch interaction functionality.\u003cbr\u003e\u003cimg class=\"alignnone size-full wp-image-36752\" src=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT_01.jpg.webp\" alt=\"\" width=\"930\" height=\"393\" srcset=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT_01.jpg.webp 930w, https:\/\/www.youritech.com\/uploads\/2026\/03\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT_01-768x325.jpg.webp 768w\" sizes=\"(max-width: 930px) 100vw, 930px\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMore 4 Inch Wide Temperature Displays For Reference\u003cbr\u003e\u003c\/strong\u003eET040HD20-K (LCD\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e,\u003c\/strong\u003e 720×720, MIPI, IPS, 700nits, -30~80°C, 77×80mm)\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003eET040HD20-KT (LCD\u003cstrong\u003e,\u003c\/strong\u003e 720×720, MIPI, IPS, 650nits, -30~80°C, 84×85.99mm, CTP)\u003cbr\u003eET040HD21-KT (LCD\u003cstrong\u003e,\u003c\/strong\u003e 720×720, TTL, IPS, 650nits, -30~80°C,84×85.99mm, CTP)\u003cbr\u003eET040HD21-K (LCD\u003cstrong\u003e,\u003c\/strong\u003e 720×720, TTL, IPS, 700nits, -30~80°C, 80×77mm)\u003cbr\u003eET040HD22-K (LCD\u003cstrong\u003e,\u003c\/strong\u003e 720×720, LVDS, IPS, 700nits, -30~80°C, 77×80mm)\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"alignnone size-medium wp-image-36753\" src=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT_02.jpg.webp\" alt=\"\" width=\"930\" height=\"266\" srcset=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT_02.jpg.webp 930w, https:\/\/www.youritech.com\/uploads\/2026\/03\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT_02-768x220.jpg.webp 768w\" sizes=\"(max-width: 930px) 100vw, 930px\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWide Temperature Displays Technology\u003cbr\u003e\u003cimg class=\"alignnone size-full wp-image-36535\" src=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/%E5%AE%BD%E6%B8%A9%E8%AF%A6%E6%83%85%E9%A1%B5_04-1.jpg.webp\" alt=\"\" width=\"930\" height=\"565\" srcset=\"https:\/\/www.youritech.com\/uploads\/2026\/03\/宽温详情页_04-1.jpg.webp 930w, https:\/\/www.youritech.com\/uploads\/2026\/03\/宽温详情页_04-1-768x467.jpg.webp 768w\" sizes=\"(max-width: 930px) 100vw, 930px\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eYOURITECH. Comprehensive Manufacturing of  Touchscreen, Driver Board Options\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.youritech.com\/uploads\/2025\/06\/%E8%A7%A6%E6%91%B8%E5%B1%8F%E5%AE%98%E7%BD%91%E8%AF%A6%E6%83%85%E9%A1%B5%E9%80%9A%E7%89%88_01-2.jpg.webp\"\u003e\u003cimg src=\"https:\/\/www.youritech.com\/uploads\/2025\/06\/%E8%A7%A6%E6%91%B8%E5%B1%8F%E5%AE%98%E7%BD%91%E8%AF%A6%E6%83%85%E9%A1%B5%E9%80%9A%E7%89%88_08-2.jpg.webp\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eYouritech Driver Board\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003eYouritech's R\u0026amp;D team provides experienced display panel motherboard solutions including industrial-grade driver boards,manufacturing and designing industry-standard TTL\/LVDS interface\/CON driver boards, LCD driver boards\/LCD inverters\/EDP driver boards\/4K driver boards,industrial displays solutions.\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"alignnone size-full wp-image-32033\" src=\"https:\/\/www.youritech.com\/uploads\/2025\/11\/driver-board.jpg.webp\" alt=\"\" width=\"930\" height=\"347\" srcset=\"https:\/\/www.youritech.com\/uploads\/2025\/11\/driver-board.jpg.webp 930w, https:\/\/www.youritech.com\/uploads\/2025\/11\/driver-board-768x287.jpg.webp 768w\" sizes=\"(max-width: 930px) 100vw, 930px\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eYouritech Production and Manufacturing\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cimg class=\"alignnone wp-image-30390\" src=\"https:\/\/www.youritech.com\/uploads\/2025\/10\/%E4%B8%B2%E5%8F%A3%E8%AF%A6%E6%83%85%E9%A1%B5_13.jpg.webp\" sizes=\"(max-width: 930px) 100vw, 930px\" srcset=\"https:\/\/www.youritech.com\/uploads\/2025\/10\/串口详情页_13.jpg.webp 930w,  https:\/\/www.youritech.com\/uploads\/2025\/10\/串口详情页_13-768x496.jpg.webp 768w\" alt=\"\" width=\"930\" height=\"601\"\u003e\u003c\/p\u003e","brand":"YOURITECH","offers":[{"title":"ET040HD21-KT Display","offer_id":53450342072629,"sku":"ET040HD21-KT","price":22.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/2221\/3685\/files\/4.0-inch-TTL-wide-temperature-screen-ET040HD21-KT-1.jpg?v=1788412155","url":"https:\/\/youritech-online.com\/products\/4-inch-wide-temperature-lcd-display-30-c-to-80-c-720-720-ttl-high-brightness-650nits-tft-lcd-display-with-capacitive-touch","provider":"YOURITECH","version":"1.0","type":"link"}