LG 40U990A-W 39.7" 5K2K IPS 120Hz Curved Monitor

A dependable choice for the office, the LG 40U990A-W offers a 39.7" 5K2K 5120x2160 IPS curved monitor on a height-adjustable stand for comfortable all-day productivity.

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
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
Technical details
Height (without stand)	419.1 mm
Depth (without stand)	106.7 mm
Width (without stand)	947.4 mm
Cable lock slot	No
Power supply type	Internal
Weight (with stand)	14.1 kg
Ergonomics
Wall mountable	Yes
VESA mounting	Yes
Panel mounting interface	100 x 100 mm
Swivelling	Yes
Height adjustment	Yes
Tilt adjustment	Yes
Picture-by-Picture (PbP)	Yes
Power
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
Width (with stand)	947.4 mm
Depth (with stand)	259.1 mm
Height (with stand)	614.7 mm
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 data
Package type	Box
Stand included	Yes
Remote control included	No
Quick start guide	Yes
Manual	Yes
Cables included	DisplayPort, HDMI, Thunderbolt, USB Type-C
Remote control batteries included	No
Power adapter included	Yes
Packaging content
Installation CD	No
Swivel arm	No
Other features
Supplied AC adapter type	144, -

Downloads

• Datasheet (PDF)