This article covers LG ウルトラワイド モニター 34U511A-B 平面 34インチ.

Overview

The LG 34U511A-B is a 34-inch UltraWide IPS monitor with a 2560×1080 resolution (21:9 aspect ratio), 100Hz refresh rate, and VESA DisplayHDR 400 certification. It covers 99% of the sRGB color space, making it suitable for photo editing and media consumption. The three-sided borderless design blends well into multi-monitor setups.
Positioned as a mid-range ultrawide monitor, it balances affordability with solid IPS image quality and HDR support. The 21:9 format significantly improves multitasking efficiency by allowing multiple windows side by side.

Connectivity & Compatibility

The monitor provides one HDMI input and one DisplayPort 1.4 input, plus a headphone jack. Full 100Hz refresh rate is achievable via DisplayPort; HDMI also supports 100Hz depending on cable and GPU capabilities.
VESA mount compatibility is not included, so users who want to use monitor arms or wall mounts should look elsewhere. The stand offers only tilt adjustment — no height, swivel, or pivot.

Product Info

Released in late 2025, the LG 34U511A-B typically retails around ¥40,000 (tax included). It comes with a 3-year manufacturer warranty and a zero dead pixel guarantee. Included accessories: HDMI cable (1.5m), power cable, and quick setup guide.
This is a mid-range product. It offers a good balance of IPS color accuracy, HDR400, and ultrawide real estate at a competitive price point. The 100Hz refresh rate is modest compared to gaming-focused models, but sufficient for office work, creative tasks, and casual gaming.

Best Use Cases

  • Office productivity: Ideal for users who work with multiple documents, spreadsheets, or browser tabs simultaneously. The 21:9 screen reduces window switching and improves workflow.
  • Photo/video editing (hobbyist level): With sRGB 99% coverage and an IPS panel, color-critical tasks are handled reasonably well. However, professionals needing Adobe RGB or DCI-P3 should consider higher-end models.
  • Casual gaming: 100Hz and 1ms MBR provide smooth motion for FPS and racing games. Competitive gamers will want 144Hz or higher, but for most players this is perfectly adequate.
  • Home theater: The 21:9 ratio matches cinematic widescreen formats, eliminating black bars for a more immersive movie experience. HDR content is supported.
    Not recommended for esports enthusiasts requiring high refresh rates or professional creators needing wide color gamut coverage.

Product Disclosure (Amazon)

  • Manufacturer: LG
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B0F6CYL2MS
  • Note: This article covers a manufacturer-made product based on Amazon listing details.