This article covers ベンキュージャパン BenQ ゲーミングモニターMOBIUZ EX321UZ 31.5インチ.

Overview

The BenQ MOBIUZ EX321UZ is a 31.5-inch gaming monitor that combines a 4K QD-OLED panel with a 240Hz refresh rate and a 0.03ms GtG response time. This puts it at the very top of the consumer gaming monitor market, offering virtually no motion blur and stunning contrast. The panel reaches a peak brightness of 1000 cd/m² in HDR mode and carries VESA DisplayHDR True Black 500 certification, delivering deep blacks and bright highlights. With 99% DCI-P3 coverage, color accuracy is excellent out of the box. BenQ also includes its AI-powered Smart Game Art feature, which analyzes over 120 gameplay scenarios to automatically adjust color modes for the best visual experience. Additional image-processing tools like gradient correction and high-pixel contrast adjustment further refine the picture. The monitor includes a remote control, KVM functionality, and a built-in USB hub, making it a versatile centerpiece for a multi-device setup.

Connectivity & Compatibility

Connectivity is comprehensive: two HDMI 2.1 ports, one DisplayPort 2.1, and one USB-C port that supports video input, data transfer, and up to 65W power delivery. This allows a single-cable connection for compatible laptops. The USB-C port also supports DisplayPort Alt Mode. The KVM function enables sharing a keyboard and mouse between two connected PCs, switching automatically with the video source. An eARC-capable HDMI port simplifies audio output to a soundbar. All video inputs support 4K at 240Hz, making the monitor fully compatible with the latest gaming PCs and consoles. However, the Smart Game Art feature requires the Color Shuttle software to be installed on a Windows PC; it does not work via the monitor's on-screen menu alone.

Product Info

The MOBIUZ EX321UZ launched in 2025 and occupies the premium tier of the gaming monitor market. Its combination of a 31.5-inch 4K QD-OLED panel, 240Hz refresh rate, and DisplayPort 2.1 connectivity is cutting-edge even by 2026 standards. The price on is around ¥236,000 (as of July 2026), reflecting its flagship status. The monitor comes with a three-year manufacturer warranty. Included accessories: power cable, DisplayPort cable, HDMI cable, USB-C cable, remote control, quick start guide, and a factory calibration report.

Best Use Cases

First, the EX321UZ is ideal for competitive gamers who demand the lowest latency and smoothest motion. The 240Hz refresh rate and 0.03ms response time give a clear advantage in fast-paced shooters and racing games. However, casual gamers or those on a strict budget may find the cost hard to justify. Second, creative professionals who work with color-critical content will appreciate the 99% DCI-P3 coverage and factory calibration. The QD-OLED panel offers wide color volume and deep blacks, suitable for photo and video editing. Keep in mind the burn-in risk with static UI elements; using screen savers or hiding the taskbar is advisable. Third, users with multiple PCs or consoles will benefit from the built-in KVM and USB hub. Switching between a gaming desktop and a work laptop becomes seamless with a shared keyboard and mouse. The remote control further enhances convenience, letting you change inputs without reaching behind the monitor.

Product Disclosure (Amazon)

  • Manufacturer: ASUS
  • Seller: オーデイズオンライン☆30日間返金保証☆
  • Fulfilled by: Amazon
  • ASIN: B09T9H1YNV
  • Note: This article covers a manufacturer-made product based on Amazon listing details.