LG ELECTRONICS LG 39.7" UltraWide 5K 120Hz Curved Monitor (40U990A-W)
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Key specs
- Display resolution5120 x 2160 pixels
- Display diagonal100.8 cm (39.7")
- Panel typeNano IPS
In stock
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Overview
The World’s First 5K2K Monitor with Thunderbolt™ 5
The LG UltraFine™ 40U990A is the world’s first 5K2K widescreen monitor with Thunderbolt™ 5, delivering ultra-fast data transfer, 96W charging, and dual display support. The monitor's 40” curved (2500R), Nano IPS Black panel offers brilliant color, and spectacular contrast - a new go-to display for creators, multritaskers and gamers.
5K2K Means More Pixels for More Creative Control
The 5K2K (5120x2160) Nano IPS Black display offers 33% more pixels than standard 4K UHD, delivering ultra-wide resolution, vivid color, and razor-sharp detail—creating a spacious, precise workspace ideal for video editing, graphic design, photography, and color-critical tasks.
Built for creators. Ready for professionals.
Built for creative flow, the UltraFine™ 5K2K screen makes it easy to work across complex timelines, layered interfaces, and multiple windows—ideal for editing, producing, and programming.
VESA DisplayHDR™ 600 Meets Nano IPS Black Brilliance
VESA DisplayHDR™ 600 and Nano IPS Black combine to deliver deep blacks, vivid highlights, and cinematic color—ideal for creators who need precision in light, shadow, and texture.
Up to 99% DCI-P3 Color Brilliance for Visual Pros
With up to 99% DCI-P3 color gamut coverage, this UltraFine™ display delivers bold, vibrant color across a wide spectrum—ideal for impactful video, photo, and design work in print, digital, and broadcast formats.
2000:1 Contrast for Stunning Visual Depth
Nano IPS Black enhances contrast to 2000:1, revealing richer shadows, deeper blacks, and sharper detail—perfect for bold color, improved depth, and edge-to-edge consistency.
5K2K Production Powered by Thunderbolt™ 5
Thunderbolt™ 5 supports commercial-level video, film, and game production with faster data transfer, 96W charging, and seamless 5K2K output—all through a single, stable, high-speed cable.
Daisy Chain Enhances Multitasking Efficiency
Daisy chain two monitors and a laptop via Thunderbolt™ 5 and DisplayPort—simplifying your workspace while expanding screen space for multitasking, content creation, or focused productivity
Versatile Ports for Limitless Possibilities
Thunderbolt™ 5, HDMI 2.1 (x2), DisplayPort 2.1 (UHBR 13.5) and USB-C let you connect laptops, cameras, and drives—no adapters needed. Enjoy stable, streamlined performance across creative, gaming, or professional workflows.
Dual Speakers. Deep, Immersive Sound.
Let the action surround you with dual speakers and Rich Bass—delivering deeper, fuller sound that enhances cinematic scenes.
FreeSync™ Premium Smooths Every Frame
FreeSync™ Premium keeps motion smooth and responsive, reducing screen tearing and stutter while mixing audio, gaming, or reviewing high-resolution video.
Personalized Your Display with Switch App
Easily customize image settings, split your screen into 11 layouts, and launch video calls instantly with the LG Switch App—streamlining your setup for productivity and entertainment.
Designed for Comfort and Focus
The narrow bezeled, 3-sided virtually borderless design and compact L-stand save space and reduce distractions, while tilt, height, and swivel adjustments support comfort and focus during long creative sessions.
Specifications
Display
| HDCP | Yes |
|---|---|
| Display brightness (typical) | 450 cd/m² |
| Screen shape | Curved |
| Display number of colours | 1.06 billion colours |
| Native aspect ratio | 21:9 |
| Pixel density | 139 ppi |
| Colour gamut | 99% |
| Maximum refresh rate | 120 Hz |
| Display brightness (min) | 320 cd/m² |
| HD type | WUHD |
| Display technology | LCD |
| Viewing angle, horizontal | 178° |
| Viewing angle, vertical | 178° |
| Pixel pitch | 0.1815 x 0.1815 mm |
| Aspect ratio | 32:9 |
| 3D | No |
| Backlight type | Edge-Lit |
| Display resolution | 5120 x 2160 pixels |
| Display diagonal | 100.8 cm (39.7") |
| Contrast ratio (typical) | 2000:1 |
| Response time (fast) | 5 ms |
| Touchscreen | No |
| High Dynamic Range (HDR) supported | Yes |
| Panel type | Nano IPS |
| DCI-P3 coverage | 99% |
| High Dynamic Range (HDR) technology | DisplayHDR 600, HDR Effect, High Dynamic Range 10 (HDR10) |
| Screen curvature rating | 2500R |
| Display diagonal (metric) | 101 cm |
| LED backlight | Yes |
| Display brightness | 400 cd/m² |
| Colour gamut standard | DCI-P3 |
| Response time measurement type | GTG (Gray to Gray) |
Audio
| Built-in speaker(s) | Yes |
|---|---|
| RMS rated power | 20 W |
Show all 103 specificationsShow fewer specifications
Performance
| Built-in microphone | No |
|---|---|
| Built-in camera | No |
| AMD FreeSync type | FreeSync Premium |
| AMD FreeSync | Yes |
| NVIDIA G-SYNC | No |
| Brand specific technologies | Black Stabilizer |
| Low input lag | No |
| FPS counter | No |
Management features
| On Screen Display (OSD) | No |
|---|---|
| Plug and Play | Yes |
| Picture-in-Picture | Yes |
Multimedia
| Number of speakers | 2 |
|---|---|
| Multiroom | No |
| Adaptive Sound Pro | No |
| Audio Return Channel (ARC) | No |
Design
| Market positioning | Professional |
|---|---|
| Country of origin | China |
| Product colour | Black |
| Refurbished | No |
Ports & interfaces
| Built-in USB hub | No |
|---|---|
| USB upstream port type | USB Type-C |
| USB Type-C downstream ports quantity | 4 |
| Headphone out | Yes |
| HDMI ports quantity | 2 |
| DisplayPorts quantity | 1 |
| HDMI | Yes |
| HDMI version | 2.1 |
| DisplayPort version | 2.1 |
| Charging port type | USB Type-C |
| Number of USB Type-C upstream ports quantity | 1 |
| Built-in KVM switch | Yes |
| HDCP version | 2.2 |
| USB required | No |
| Bluetooth | No |
| Ethernet LAN | Yes |
Ergonomics
| Wall mountable | Yes |
|---|---|
| VESA mounting | Yes |
| Cable lock slot | No |
| Panel mounting interface | 100 x 100 mm |
| Swivelling | Yes |
| Height adjustment | Yes |
| Tilt adjustment | Yes |
| Picture-by-Picture (PbP) | Yes |
Power
| Power supply type | Internal |
|---|---|
| AC input voltage | 100 - 240 V |
| AC input frequency | 50/60 Hz |
| Power consumption (standby) | 1.2 W |
| Power consumption (typical) | 40 W |
| Power consumption (off) | 0.3 W |
| Energy efficiency scale | A to G |
| Energy efficiency class (SDR) | F |
| Energy efficiency class (HDR) | G |
| Energy consumption (SDR) per 1000 hours | 45 kWh |
| Energy consumption (HDR) per 1000 hours | 58 kWh |
Weight & dimensions
| Height (without stand) | 419.1 mm |
|---|---|
| Depth (without stand) | 106.7 mm |
| Width (without stand) | 947.4 mm |
| Width (with stand) | 947.4 mm |
| Depth (with stand) | 259.1 mm |
| Height (with stand) | 614.7 mm |
| Weight (with stand) | 14.1 kg |
| Weight (without stand) | 9.21 kg |
| Package width | 1206.5 mm |
| Package depth | 200.7 mm |
| Package height | 419.1 mm |
| Package weight | 17.8 kg |
Packaging content
| Installation CD | No |
|---|---|
| Swivel arm | No |
Other features
| Supplied AC adapter type | 144, - |
|---|
Manuals & downloads
Customer reviews
Delivery & returns
Delivery
- FREE standard delivery on orders over €50, otherwise €4.99 (3–5 working days).
- Express delivery €9.99 (1–3 working days) on selected products.
- Northern Ireland delivery €9.99 (3–5 working days).
- PlayStation and Arozzi products use a 5–7 working-day service.
- Orders are processed within 24 hours, Monday to Friday excluding bank holidays. All deliveries must be signed for.
Returns
- Changed your mind? Tell us within 14 days of receiving your item, then return it within a further 14 days, unused and in its original packaging. A minimum €9.99 collection fee applies.
- Faulty or damaged on arrival? Contact us within 48 hours of delivery.
- Custom-built PCs can only be returned if faulty. Opened headphones, earphones and AirPods can't be returned for hygiene reasons.