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LG UltraWide™ 34 Inch 144Hz WQHD Curved (1800R) Monitor 34U640B with USB-C, HDR 10, and sRGB 99% (Typ.)
Product Information Sheet
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Key Features

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LG UltraWide™ 34 Inch 144Hz WQHD Curved (1800R) Monitor 34U640B with USB-C, HDR 10, and sRGB 99% (Typ.)
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LG UltraWide Monitor Curved logo. LG UltraWide Monitor Curved logo.

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LG UltraWide Curved Monitor on a modern desk, displaying immersive first-person gaming on a wide curved screen alongside a multitasking interface, delivering expansive visuals, smooth gameplay, and enhanced productivity in a home office workspace setup. LG UltraWide Curved Monitor on a modern desk, displaying immersive first-person gaming on a wide curved screen alongside a multitasking interface, delivering expansive visuals, smooth gameplay, and enhanced productivity in a home office workspace setup.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
*The above keyboard and mouse are not included in the package (sold separately).
LG UltraWide Curved Monitor feature overview showing a 34-inch WQHD curved display, HDR10 with sRGB 99% color accuracy, all-in-one USB-C connectivity, smooth 144Hz refresh rate, AMD FreeSync Premium support, and a slim stand with tilt and height adjustment for immersive gaming and efficient multitasking. LG UltraWide Curved Monitor feature overview showing a 34-inch WQHD curved display, HDR10 with sRGB 99% color accuracy, all-in-one USB-C connectivity, smooth 144Hz refresh rate, AMD FreeSync Premium support, and a slim stand with tilt and height adjustment for immersive gaming and efficient multitasking.

21:9 WQHD Curved Display

The UltraWide™ WQHD (3440×1440) resolution with a 21:9 aspect ratio offers ample screen space to run multiple programs simultaneously, enhancing work efficiency. The 1800R curvature follows the natural field of view to reduce distortion, while the 3-side virtually borderless screen provides an unobstructed, wide display for a more immersive and comfortable viewing experience.
LG UltraWide Monitor displaying multiple applications across a 34-inch 21:9 screen, with a highlighted comparison showing the additional horizontal space over a standard 27-inch 16:9 display. LG UltraWide Monitor displaying multiple applications across a 34-inch 21:9 screen, with a highlighted comparison showing the additional horizontal space over a standard 27-inch 16:9 display.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
HDR10 with sRGB 99%

True-to-life color
with advanced color accuracy

HDR10 compatibility and 99% sRGB coverage provide accurate color reproduction and tone mapping in HDR scenes.
LG UltraWide Curved Monitor displaying vivid creative content on a wide curved screen with HDR10 support and sRGB 99% color coverage, delivering rich color accuracy, enhanced contrast, and precise visual detail for creative work and immersive viewing. LG UltraWide Curved Monitor displaying vivid creative content on a wide curved screen with HDR10 support and sRGB 99% color coverage, delivering rich color accuracy, enhanced contrast, and precise visual detail for creative work and immersive viewing.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
*sRGB 99% is typical. Color gamut may vary by model.
Futuristic motorcyclists racing through a neon-lit city street, with motion blur in the background and a highlighted section showing sharp, clear visuals to demonstrate the smooth performance and clarity of a 144Hz refresh rate. Futuristic motorcyclists racing through a neon-lit city street, with motion blur in the background and a highlighted section showing sharp, clear visuals to demonstrate the smooth performance and clarity of a 144Hz refresh rate.

Fluid gaming experience
with 144Hz refresh rate

Delivers smooth and responsive performance with a 144Hz refresh rate, delivering fluid visuals and clearer motion for more responsive gameplay that gives you a competitive edge.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
AMD FreeSync™ Premium

Smooth motion that keeps you immersed

Powered by AMD FreeSync™ Premium certification, this monitor provides tear-free, ultra-smooth visuals and low latency, delivering unmatched gaming precision and fluidity.
LG UltraWide Curved Monitor illustrating AMD FreeSync technology with a side-by-side comparison of disabled and enabled modes, showing reduced screen tearing and smoother, more fluid motion for responsive and immersive gameplay. LG UltraWide Curved Monitor illustrating AMD FreeSync technology with a side-by-side comparison of disabled and enabled modes, showing reduced screen tearing and smoother, more fluid motion for responsive and immersive gameplay.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
*The performance of the feature is compared to the models not applying the sync technology.
*Actual results or performance may vary depending on the use environment
*Errors or delays may occur depending on the network connection.
  • Comparison of gameplay with Dynamic Action Sync off and on, highlighting reduced input lag on the UltraWide monitor.

    Dynamic Action Sync

    Reducing input lag with Dynamic Action Sync, gamers can catch critical moments in real-time and respond quickly.

  • Comparison of gameplay with Black Stabilizer off and on, showing enhanced visibility in dark scenes on the UltraWide monitor.

    Black Stabilizer

    Black Stabilizer helps gamers detect snipers lurking in the darkest corners and swiftly navigate through flash explosions.

*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
USB Type-C® with 65W Power Delivery

All-in-one USB-C connectivity

This monitor offers USB Type-C®, DisplayPort, two HDMI ports, and two USB-A ports to ensure smooth connectivity with various devices.
The USB Type-C® port supports both display output and data transfer, allowing easy connection to your laptop with a single cable.
LG UltraWide Curved Monitor with all-in-one USB-C connectivity, providing video, data transfer, and up to 65W power delivery through a single cable, enabling a clean desk setup and efficient multitasking with a connected laptop. LG UltraWide Curved Monitor with all-in-one USB-C connectivity, providing video, data transfer, and up to 65W power delivery through a single cable, enabling a clean desk setup and efficient multitasking with a connected laptop.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
*To work properly, the usb type-c cable is required (sold separately).
LG UltraWide Curved Monitor enabling control of multiple devices with a single monitor, keyboard, and mouse through Dual Controller (KVM switch), supporting seamless multitasking and easy file sharing across two connected PCs.
Dual Controller (KVM* Switch)

Control multiple devices with a single monitor

Work seamlessly across two PCs with one monitor, keyboard, and mouse—just drag and drop files using the Dual Controller.
*The cables included in the package are USB-C, HDMI and DP. *KVM stands for Keyboard, Video, and Mouse. *The KVM Switch enables control of multiple devices with one keyboard, mouse, and monitor.
*Feature availability may vary by model and region.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.

Enhanced comfort in each detail

This animation shows the LG Switch app being used.
LG Switch app

Switch swiftly

You can readily divide the whole display into up to 6 sections, change the theme design, or even launch a video call platform with a mapped hotkey. It also supports PBP and PIP modes for efficient multitasking across multiple input sources.
Download
*The images are simulated to enhance feature understanding and may differ from actual use.
*To download the latest LG Switch app, search in the LG.com Support Menu.
LG ultra-wide monitor showing a side-by-side comparison of Reader Mode Off and On, with the right half displaying warmer tones and reduced blue light for comfortable viewing.

Reader Mode

Adjusts color temperature and brightness to help reduce eye fatigue when viewing documents for extended periods.
LG ultra-wide monitor displaying a split-screen comparison of a mountain landscape, with the left side showing screen flicker and the right side showing a clear, flicker-free image

Flicker Safe

Minimizes invisible screen flicker to help reduce eye strain and support a more comfortable viewing experience during extended use.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
*Above feature may vary depending on real use conditions that the user is using.

Clutter-free with slender stand

Experience our 3-side virtually borderless design with an adjustable base that supports both tilt and height control. Its slender, clutter-free stand minimizes desk space and reduces unused space, creating a cleaner and more refined workspace.

Tilt adjustable icon. Tilt -5°~15°

Height adjustable icon. Height 80mm

Top view of a LG UltraWide Curved Monitor on a desk with a coffee cup, wireless keyboard, and mouse, alongside a close-up of the slim, square-shaped monitor base designed for stability and a clutter-free workspace. Top view of a LG UltraWide Curved Monitor on a desk with a coffee cup, wireless keyboard, and mouse, alongside a close-up of the slim, square-shaped monitor base designed for stability and a clutter-free workspace.
*Images have been simulated to enhance feature understanding, and may differ from actual use experience.
*The above keyboard and mouse are not included in the package (sold separately).
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COMPLIANCE INFORMATION
  • The safety information for accessories is included with the safety information for the product and is not provided separately.
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*Prices, promotions and availability may vary by store and online. Prices subject to change without notice. Quantities are limited. Check with your local retailers for final price and availability.
With an LG computer monitor you’ll discover cutting-edge display technology and slim designs, from the LG 21:9 UltraWide monitors to our latest TV monitors, which offer state-of-the-art display and features. You’ll get a new outlook on life with 2 in 1 TV+Monitors and other IT products from LG. LG makes life good.