LG 27-Inch Full HD (27U421A) 100Hz Curve Monitor – Black

LG 27U421A-B 27-inch Full HD (1920 x 1080) Curved Gaming Monitor, 100Hz, 5ms, HDR10, 3-Side Borderless, Switch, HDMI, USB Type-C 15W PD, Tilt Slim Stand, Black

Display & Performance

• 27-inch VA curved screen (1920 x 1080 resolution)
• 100Hz refresh rate and 5ms (GtG) response time
• 3000:1 contrast ratio with 250 nits typical brightness
• 99% sRGB color gamut coverage

Features & Connectivity

• USB Type-C port (supports display and up to 15W Power Delivery) and HDMI
• Gaming assists: Dynamic Action Sync and Black Stabilizer
• Eye comfort: Reader Mode and Flicker Safe
• Software support via the LG Switch app for screen splitting 

An unboxing and detailed look at the physical setup of the monitor:

Key features

• Full HD clarity and vibrant color on a curve built for everyday focus
• 100Hz refresh rate keeps motion smooth for work, play, and everything else
• USB-C and HDMI keep connections simple, clean, and ready for anything
• Dynamic Action Sync cuts input lag for faster, more responsive gameplay
• Black Stabilizer boosts visibility in dark scenes for a competitive edge
• Customize Your Screen View with the Switch App¹
• Ultra-slim stand frees up desk space for a cleaner, simpler setup
• Three-side narrow bezel for more screen space and fewer distractions

Vivid Color with Full HD Resolution

The 1920x1080 Full HD resolution on the 27" delivers clear visuals and vibrant color on a curved screen designed to keep more of your work in view. Tackle tasks, browse, or stream with clarity that helps you stay focused and efficient.

100Hz Smoother, Seamless Visuals

With a 100Hz refresh rate and 5ms (GtG) response time, motion stays smooth and clear—whether you're scrolling, streaming, or switching between tasks.

Multiple Devices-One Cable

Easily connect to laptops, desktops, or devices with USB Type-C™ and HDMI. USB-C delivers up to 15W power —all through a single, streamlined cable.

Easy Viewing, Comfortable Reading

Reader Mode lowers blue light levels, creating a more comfortable viewing experience—great for reading documents, browsing the web, or working for extended periods.

Action As It Happens

Don’t miss a beat. Dynamic Action Sync helps you spot the action and strike fast by reducing input lag and boosting responsiveness.

Never In The Dark

Brighten up dark scenes and spot enemies faster with Black Stabilizer. It enhances visibility in shadowy areas—giving you the upper hand when the action gets intense.

Customize Your Screen View with the Switch App

The Switch app1 transforms your screen into a multitasking hub for work, gaming, and streaming. Effortlessly split the screen into up to 6 sections, customize display layouts, or launch video calls with a single hotkey. Navigate smart features with ease and switch seamlessly between your PC and the built-in webOS streaming platform, all with intuitive shortcuts.

Sleek Stand, Maximum Desktop Efficiency

Free up your desk with the ultra-slim stand—built to minimize clutter and maximize usable space. Enjoy a cleaner, more organized setup without sacrificing screen size or comfort.

Virtually Borderless Design

Maximize your workspace with the ultra-slim stand, designed to minimize desk clutter and optimize space. Enjoy a cleaner, more organized work area while still experiencing a full, immersive display.