This article covers LG ウルトラワイドモニター LG Smart Monitor AI 34U640SB-W.

Overview

The LG 34U640SB-W is a 34-inch ultrawide curved monitor that stands out by integrating LG's webOS smart TV platform. This means you can stream Netflix, YouTube, and other services directly from the monitor without ever turning on a PC. It also features a 144Hz refresh rate, making it suitable for gaming, and a USB-C port that delivers up to 90W of power delivery to charge a connected laptop. With a 3440×1440 resolution, VA panel, 1800R curvature, sRGB 99% color gamut, and 10-bit color depth (approx. 1.07 billion colors), this monitor delivers vivid, immersive visuals for both work and entertainment. The anti-glare coating reduces reflections, and the height/tilt adjustable stand helps you find a comfortable viewing angle.

Connectivity & Compatibility

The monitor offers USB-C (DisplayPort Alt Mode) with 90W Power Delivery, plus HDMI and DisplayPort inputs. The USB-C port also carries data, and you can plug peripherals into the monitor's USB-A ports to use them as a hub. A remote control is included for navigating webOS and switching inputs. Compatibility is broad: any laptop with USB-C Alt Mode can use a single cable for video, data, and charging. Windows and macOS are both fully supported. Note that you need a DisplayPort Alt Mode‑capable USB-C cable for video, and the host device must support USB PD for charging.

Product Info

Released in mid‑2025, the 34U640SB-W sits in the mid‑to‑high tier of LG's smart monitor lineup. The retail price is around ¥77,000 (as of July 2026 on Japan). LG backs it with a 3‑year manufacturer warranty plus a zero bright‑pixel guarantee, giving extra peace of mind. The package includes a power cable, HDMI cable, remote control, and batteries. The built‑in stereo speakers are adequate for casual streaming, though external speakers would improve the audio experience.

Best Use Cases

Streaming enthusiasts: With webOS built in, you can watch Netflix, YouTube, and other services instantly using the remote. No PC needed – perfect for a bedroom or living room setup. Creative professionals on the go: A single USB-C cable connects a laptop to the monitor, charges it, and acts as a USB hub. The wide color gamut and 10‑bit panel make it suitable for photo and video editing. * Casual gamers: The 144Hz refresh rate and 5ms GTG response time provide smooth gameplay for most titles. The VA panel’s deep blacks enhance immersion in dark scenes. However, competitive players may prefer faster IPS or TN panels. If you don't need the smart TV features, you might get a higher‑refresh or faster‑response monitor at a similar price. But for an all‑in‑one solution that combines a high‑resolution ultrawide, USB‑C docking, and streaming, the 34U640SB-W is a compelling choice.

Product Disclosure (Amazon)

  • Manufacturer: LG
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B0GYPQ4Q2K
  • Note: This article covers a manufacturer-made product based on Amazon listing details.