Display Technology


Accelerate small display integration with plug-and-play 3.5” IPS HDMI TFTs


By Rolf Horn, applications engineer, DigiKey D


esigners selecting displays for industrial controls, medical equipment, and other compact systems need to squeeze more information into smaller screens


while improving legibility, ease of use, and reliability. At the same time, they need to lower costs while accelerating development. With traditional options, it is challenging enough to find the right combination of size, resolution, brightness, and industrial performance. Then the problem becomes ease of integration. Small industrial displays are typically offered as panels or modules, but these require designers to expend considerable effort wrestling with low-level drivers, backlighting, and electromagnetic interference (EMI) mitigation.


This article briefly reviews the challenges designers face in developing compact systems. It then introduces 3.5”, high- visibility plug-and-play displays from Newhaven Display and shows how they can be quickly integrated and deployed.


Rising demands for compact high-resolution displays Historically, small-form-factor equipment could make do with low-resolution screens. With their limited functionality, these legacy systems needed little more than simple menus and basic indicators. However, modern equipment requires high-resolution displays that can present complex data with a polished user experience.


These changes have been driven by the introduction of features such as Internet of Things (IoT) connectivity and sophisticated analytics. Consider portable diagnostic tools and measurement equipment. These devices need to do more than just report readings. They must provide deep performance insights and give visual guidance when addressing issues.


Platform evolution also drives resolution requirements. As classic embedded RTOS environments give way to modern platforms such as Linux, Windows Embedded, and Raspberry Pi, designers face a practical


26 May 2026


Figure 1: Shown are 3.5” IPS HDMI TFT displays that integrate a sharp 640 × 480 panel into a complete plug-and-play assembly. (Image source: Newhaven Display)


constraint: modern operating systems expect display resolutions of at least 640 × 480, which traditional displays for small-form- factor equipment simply cannot deliver. From a development perspective, higher resolutions make it practical to reuse user interface frameworks, widgets, and icon libraries originally developed for desktops, tablets, or embedded systems with larger displays. This reuse helps ensure consistent branding and behaviour across product families while avoiding one-off, low-level GUI work.


Why traditional small displays complicate integration


To meet these demands, designers are moving away from the 320 × 240 resolution common in small displays toward crisp, responsive 640 × 480 thin-film-transistor (TFT) screens with technologies


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such as in-plane switching (IPS) for accurate colour and wider viewing angles. This quadrupling of pixel count delivers a superior user interface but also introduces two interrelated challenges.


High-resolution displays under 5 in. are typically offered as bare panels accessed through interfaces such as 24-bit RGB, LVDS,


or MIPI-DSI. To integrate these panels, designers must contend with high-speed circuit design, fussy cabling, and EMI from the high-frequency signals. Similarly, small displays often come with “just-the-basics” backlighting, leaving designers to source LED drivers and implement dimming controls. On the software side, bare panels lack


Figure 2: The NHD-3.5-HDMI-HR-RSXP-CTU integrates a sharp 640 × 480 panel into a complete display assembly with EMI shielding around the high-frequency components. (Image source: Newhaven Display, modified by author)


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