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LG UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor

BH #LG40U990AWAU • MFR #40U990A-W.AUS
17 reviews
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LG UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor
Key Features
  • 39.7" 21:9 2500R Curved IPS Panel
  • HDMI | DisplayPort | Thunderbolt 5 (96W)
  • 5K2K 5120 x 2160 at 120 Hz
  • FreeSync Premium Pro
Enhance your multitasking while editing videos and creating content with the LG UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor. With its 2500R curved design, this ultrawide display envelopes your view with a 5120 x 2160 (5K2K) resolution, giving you a large workspace while delivering rich, accurate colors and versatile connectivity.
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LG 40U990A Overview

Enhance your multitasking while editing videos and creating content with the LG UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor. With its 2500R curved design, this ultrawide display envelopes your view with a 5120 x 2160 (5K2K) resolution, giving you a large workspace while delivering rich, accurate colors and versatile connectivity.

With HDR10 support, the UltraFine delivers stunning visuals featuring realistically bright highlights and deep shadows. Connecting your compatible computer to the Thunderbolt 5 port allows you to transfer video, up to 80 Gb/s of data, and 96W of power over a single cable. You can also use the second Thunderbolt 5 and DisplayPort out ports to daisy chain an additional display. The USB 3.2 Gen 2 hub allows you to connect up to 10 Gb/s peripherals. There are also two HDMI 2.1 ports and one DisplayPort 2.1 input.

Exceptional Color
Framed inside thin bezels, the 39.7" Nano IPS Black panel is factory calibrated to deliver cinematic experiences with support for 1.07 billion colors, covering 99% of the DCI-P3 gamut. VESA DisplayHDR True Black 600 certified high-dynamic range support provides realistic visuals with a 2000:1 static contrast ratio and 450 nits brightness.
Smooth Graphics
The UltraFine display minimizes motion blur with a 120 Hz refresh rate while AMD FreeSync Premium support eliminates screen tearing and stuttering with compatible graphics cards.
Rich Connectivity
In addition to the Thunderbolt 5 host and passthrough ports, this display includes four USB-C and two USB-A 3.2 Gen 2 ports. The RJ45 Ethernet port allows you to connect to wired networks.
Enhanced Multitasking
Built-in KVM functionality allows you to control multiple devices using a single mouse and keyboard set in picture-by-picture or picture-in-picture mode.
Immersive Audio
The built-in speaker system is designed to deliver deep bass for rich audio. The 4-pole 3.5mm audio jack allows you to connect a headset for added privacy while chatting.
Customize Your Screen View
Use the LG Switch app to customize your image settings, split the screen into 11 different layouts, and launch video calls.
Designed for Comfort and Focus
The minimalistic L-stand helps to free up desktop space. You can optimize your view by adjusting the height, tilt, and swivel. A 100 x 100mm VESA mounting pattern allows you to attach the screen to a swivel arm or multi-monitor stand. The 178° horizontal and vertical viewing angles let you see the screen clearly from almost any position.
UPC: 195174122365

LG 40U990A Specs

Key Specs
Display Size
39.7"
Panel Type
IPS-Type LCD
Native Resolution
5120 x 2160
Maximum Brightness
450 nits / cd/m2
HDR Support
Yes: HDR10
Color Support
1.07 Billion Colors
Color Gamut
99% DCI-P3
Finish
Anti-Glare
Touchscreen
No
A/V Inputs
DisplayPort 2.1 / HDMI
A/V Outputs
3.5 mm (Analog Audio)
USB I/O
USB-A 3.2 Gen 2 / USB-C 3.2 Gen 2 / Thunderbolt 5
Built-In Speakers
Yes: 2x 10 W
Display
Size
39.7"
Panel Type
IPS-Type LCD
Aspect Ratio
21:9
Native Resolution
5120 x 2160
Maximum Brightness
450 nits / cd/m2
HDR Support
Yes: HDR10
Contrast Ratio
2000:1
Response Time
5 ms (GtG)
Refresh Rate
120 Hz
Variable Refresh Technology
FreeSync Premium
Color Support
1.07 Billion Colors
Color Gamut
99% DCI-P3
Viewing Angle (H x V)
178 x 178°
Curved Display
Yes: 2500R
Finish
Anti-Glare
Surface
Touchscreen
No
Connectivity
A/V Inputs
2x HDMI
1x DisplayPort 2.1
A/V Outputs
1x 1/8" / 3.5 mm (Headphone)
HDCP Support
Yes
USB I/O
2x USB-C (Thunderbolt 5) with USB PD 96 W
1x USB-C 3.1/3.2 Gen 2 with USB PD 15 W
4x USB-C 3.1/3.2 Gen 2
2x USB-A 3.1/3.2 Gen 2
Ethernet I/O
1x RJ45
Multi-Input Support (PIP/PBP)
Yes: Picture-in-Picture (PIP), Picture-by-Picture (PBP)
Speaker
Built-In Speakers
Yes: 2x 10 W
Electrical
Power Consumption
Operational: 45.0 W
Input Power
100 to 240 VAC, 50 / 60 Hz
Power Adapter Type
Internal
General
Adjustments
Swivel: 40°
Tilt: 25° (-5 to 20°)
Height: Up to 5.1" / 129.5 mm
VESA Mounting-Hole Pattern
100 x 100 mm
Lock Slot
No
Packaging Info
Package Weight
39.5 lb
Box Dimensions (LxWxH)
47 x 21 x 8"

LG 40U990A Reviews

Ultrawide display excellent choice for sight challenged

By Earl
Rated 5 out of 5
Date: 2026-07-13

I have a degenerative retinal defect and am looking for a good monitor for my MacBook Pro M3 to provide a wide screen and comfortable viewing. The 39.7" LG UltraFine gives me an excellent large format screen with great contrast control (you don't need to overdrive brightness to achieve optimal clarity). Also, the slight curve of the screen helps maintain a consistent distance from my eyes (reduces fatigue from refocusing as I look across the screen). While a bit expensive, I was able to find a good deal for the value. I'm very pleased.

An Upgrade for Coding and Content Creation

By Manuel C
Rated 4 out of 5
Date: 2026-05-26

[This review was collected as part of a promotion.] The LG UltraFine 40U990A-W has been a strong upgrade to my workflow as a software engineer. The 5K2K resolution gives me plenty of space for coding and content creation, and the curved design keeps everything easy to see. The built-in KVM switch is especially helpful since I switch between work and personal devices often. I love the white finish, the metal stand, the amount of ports, and how well the LG Switch app fits into my setup. A few things I didn’t enjoy: the fan noise is louder than expected and always on, the cable-management hole sits too low and shows the cables, and I wish there were a software way to switch inputs. Still, it improves my day-to-day workflow. Review submitted as part of a program that provides a purchase discount.

See any errors on this page?

Does this monitor support G-Sync?

Does this monitor support G-Sync?
Asked by: Sarah
The LG UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor, B&H # LG40U990AWAU, is not officially G-Sync certified. It does support AMD FreeSync Premium, which means that it can be used in "G‐Sync Compatible mode."
Answered by: Miguel M
Date published: 2025-09-21

Does it work with Mac computers?

Does it work with Mac computers?
Asked by: Richard
The UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor, B&H # LG40U990AWAU, is compatible with Mac computers.
Answered by: Miguel M
Date published: 2025-11-09

Is the ethernet port 1Gbps or 2.5Gbps?

Is the ethernet port 1Gbps or 2.5Gbps?
Asked by: CHRISTOPHER
The Ethernet port speed on the LG UltraFine 40U990A 39.7" 5K2K HDR 120 Hz Curved Ultrawide Monitor is 1 Gbps.
Answered by: JP A
Date published: 2025-09-22

Is this monitor compatible with MacBook?

Is this monitor compatible with MacBook?
Asked by: Malcolm
Yes, the LG 39.7" UltraFine 5K2K 120 Hz Curved Ultrawide Monitor & Apple Thunderbolt 5 Cable Kit is compatible with MacBooks.
Answered by: Kenneth C
Date published: 2026-05-12
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