LG 40U990A

LG 40U990A Review & Specifications

40U990A by LG from the UltraFine series, is a 39.70″ IPS monitor with a resolution of 5120 × 2160 pixels and a refresh rate of up to 120 Hz. It supports a 8-bit color depth, displays up to 16777216 colors, and offers the following color space coverage: 99.00% DCI-P3 . The panel delivers 450 nits of brightness, and can reach up to 600 nits peak, has a static contrast ratio of 2000:1, a response time of 5.00 ms. The panel is manufactured by LG Display (model: LM400RW2-SSA1). It has a pixel density of 140 PPI, with viewing angles of 178 ° (degrees)° horizontal and 178 ° (degrees)° vertical. The screen covers 91.57% of the front surface, and it features a 2500R curved panel. It uses a Edge LED (Local Dimming) backlight and has a Anti-glare/Matte (3H) screen coating. Built-in 2 x 10 W (watts) speakers are included. The display supports local dimming (Edge-lit), with 8 dimming zones. Typical power consumption is 45.00 W.

General Work Usage

The LG 40U990A achieves an outstanding 96.2% work usage score, making it an excellent choice for productivity-focused users, including professionals who engage in coding, document editing, and multitasking in office applications. It utilizes an IPS panel—a top-tier choice for productivity. IPS and similar panels deliver exceptional color accuracy, wide viewing angles, and consistent brightness across the screen. Their resistance to burn-in makes them especially well-suited for prolonged use involving static content like spreadsheets, toolbars, and text editors. The monitor’s extremely high resolution of 5120×2160 provides an abundance of screen real estate, ideal for multitasking, side-by-side window use, or detailed content creation. With a pixel density of 140 ppi, the display offers very clear text and smooth images. Some users may still prefer scaling settings to enhance readability, especially for long working sessions. With a typical brightness of 450 nits, and peaks up to 600 nits, this monitor maintains excellent visibility even in well-lit office spaces.

The LG 40U990A has color space coverage of: 99.00% DCI-P3 , which gives this monitor exceptional color gamut coverage, making it a top-tier choice for professionals working in color-sensitive applications such as photo editing (Photoshop, Lightroom), video grading, or design production. Colors appear rich, consistent, and accurate across supported spaces. Despite the excellent color coverage, the standard 8-bit panel limits color depth and smoothness in gradient transitions, making it less ideal for critical design or publishing workflows.

The work performance-per-price score of 10.7% indicates that this monitor does not offer strong value for professional productivity use. However, its exceptional work usage score of 96.2% may justify the price for users who value quality, clarity, and ergonomics in demanding workflows.

Gaming and Media Usage

The LG 40U990A earns a solid 81.9% rating for gaming and media use, offering smooth visuals, decent color accuracy, and responsive performance that will satisfy most gamers and movie enthusiasts. It utilizes an IPS panel, which is widely appreciated for accurate color reproduction, wide viewing angles, and consistent brightness. These panels are a balanced and reliable choice for gamers who enjoy vivid visuals and moderate HDR. High-end IPS models often support local dimming zones and high peak brightness levels, enhancing the experience in HDR games and bright rooms. While response times are slightly slower than OLED or TN, recent advancements have greatly reduced motion blur and input lag. The monitor’s extremely high resolution of 5120×2160 delivers incredibly sharp visuals and exceptional detail, ideal for immersive single-player games and 4K media playback. However, running modern titles at this resolution requires a very powerful GPU to maintain smooth frame rates. The monitor offers a high refresh rate of 120 Hz, providing fluid gameplay and improved responsiveness over standard 60 Hz displays, though some minor motion blur may occur with its 5.00 ms response time.

The monitor provides very good ergonomic support, enabling users to adjust it for improved comfort during extended gaming, viewing, or daily activities, and offers excellent connectivity, supporting a wide range of usage scenarios and seamless integration with various devices and setups.

Specific ergonomic adjustments and connectivity details can be found in the specifications section below.

Performance per Price

The gaming performance-per-price score of 6.4% indicates that this monitor does not offer strong value for gaming-focused users. Its respectable gaming suitability rating of 81.9% may still justify the price for certain use cases, though better-valued options exist.

With a performance-per-price score of just 10.0%, this monitor does not offer strong value in its category. However, its high-end overall quality of 90.3 pts may still justify the purchase for users prioritizing build excellence, display fidelity, or brand preference over cost.