RATED
Excellent
8.6/10
39.7″ LG 40U990A – Full Specifications
At the upper end of LG's UltraFine range, the LG 40U990A is a 39.7-inch curved IPS monitor at 5120 × 2160 that covers 99% DCI-P3.
LG●Monitor
Display
39.7 in, IPS, 5120 × 2160
39.7
Refresh Rate
48–120 Hz
48
Brightness
450 nits
Contrast Ratio
2000:1
2000
Overview
At the upper end of LG's UltraFine range, the LG 40U990A is a 39.7-inch curved IPS monitor at 5120 × 2160 that covers 99% DCI-P3. It reaches 48–120 Hz with 450 nits, and offers DisplayPort 2.1 (UHBR20), two HDMI 2.1 ports, four USB-C 3.2 ports, two USB-A 3.2 ports and a KVM switch. Rich Bass speakers are built in, and the stand adjusts for height and swivel. It weighs 14.1 kg. The very high resolution and port selection make it a good fit for creators who work with several computers at once.
- 39.7-inch curved (2500R) IPS, 5120 × 2160 at 140 ppi
- 48–120 Hz, 450 nits, 99% DCI-P3
- DisplayPort 2.1 UHBR20, 2× HDMI 2.1
- 4× USB-C 3.2, 2× USB-A 3.2, KVM switch
- Rich Bass speakers, height and swivel stand, 14.1 kg
Pros & Cons
Pros
- Very wide, sharp 5K2K workspace for timelines and editing
- Four USB-C ports give outstanding connection flexibility
- KVM switch simplifies multi-computer desks
- Bright, wide-gamut IPS Black panel with strong contrast
- Built-in speakers with Rich Bass emphasis
Cons
- 14.1 kg weight needs a sturdy desk or mount
- No pivot adjustment on the stand
- Driving 5K2K at 120 Hz needs a strong graphics card
- 5 ms response is slower than dedicated gaming panels
Score & Ratings
8.6/10
Excellent
Model Information
8
| Specification | Value |
|---|---|
| Brand | LG |
| Series | UltraFine |
| Model | 40U990A |
| Model Alias | UltraFine 40U990A40U990A-W |
| Full Product Name | LG UltraFine 40U990A |
| Model Year | 2025 |
| Monitor Type | UltraWide Monitor |
| Available Colors | White and Silver |
Display & Panel
17
| Specification | Value |
|---|---|
| Screen Size | 39.7 in |
| Exact Diagonal | 39.71 in |
| Screen Shape | Curved |
| Radius of Curvature | 2500R |
| Screen Format | UltraWide |
| Aspect Ratio | 2.37:1 |
| Active Display Width | 929.28 mm |
| Active Display Height | 392.04 mm |
| Display Area | 91.57% |
| Panel Type | IPS |
| Panel Manufacturer | LG Display |
| Backlight Type | Edge LED |
| Local Dimming | Yes |
| Local Dimming Zones | 8 |
| 3D Support | No |
| Screen Coating | Anti-glare / Matte |
| Coating Hardness | 3H |
39.7" Display Size (100.8 cm) 21:9
Resolution & Pixel Details
3
| Specification | Value |
|---|---|
| Native Resolution | 5120 × 2160 |
| Pixel Density | 140 ppi |
| Pixel Pitch | 0.182 mm |
Picture Quality & Color
10
| Specification | Value |
|---|---|
| Panel Bit Depth | 10-bit (8-bit + FRC) |
| FRC | Yes |
| Display Colors | 1.07 billion |
| Total Color Bits | 30-bit |
| Typical Brightness | 450 nits |
| Peak Brightness | 600 nits |
| HDR Support | Yes |
| HDR Formats |
|
| HDR10 | Yes |
| DCI-P3 Coverage | 99% |
DESK DISTANCE FIT
65cm
CompactIdeal FitWideUltra-Wide
Spans well beyond central vision — ideal for multitasking, edges will need head turns.
Refresh Rate, Response & Gaming
5
| Specification | Value |
|---|---|
| Refresh Rate Range | 48–120 Hz |
| Minimum Response Time | 5 ms |
| Average Response Time | 14 ms |
| Picture-by-Picture | Yes |
| Picture-in-Picture | Yes |
Ports & Connectivity
12
| Specification | Value |
|---|---|
| HDMI Ports |
|
| HDMI Version | HDMI 2.1 |
| DisplayPort Input | 1× DisplayPort 2.1 (UHBR20) |
| DisplayPort Version | DisplayPort 2.1 |
| DisplayPort Bandwidth | UHBR20 |
| HDCP Support | Yes |
| HDCP Version | HDCP 2.2 |
| USB-C Input | 4× USB-C 3.2 |
| USB-C Data Speed | 10 Gbps |
| USB-A Ports |
|
| Audio Output | 3.5 mm (4-pole) |
| Headphone Output | Yes |
Ports & Connections
Audio, Camera, Network & Smart Features
4
| Specification | Value |
|---|---|
| Built-In Speakers | Yes |
| Speaker Configuration | 2 × 10 W |
| Audio Technologies | Rich Bass |
| Built-In Camera | No |
Ergonomics & Stand
11
| Specification | Value |
|---|---|
| VESA Mount | Yes |
| Removable Stand | Yes |
| Height Adjustment | Yes |
| Height Adjustment Range | 130 mm |
| Tilt Adjustment | Yes |
| Forward Tilt | 5° |
| Backward Tilt | 20° |
| Swivel Adjustment | Yes |
| Left Swivel | 20° |
| Right Swivel | 20° |
| Pivot Adjustment | No |
Dimensions, Weight & Design
6
| Specification | Value |
|---|---|
| Dimensions With Stand | 947.7 × 484.3 × 260 mm |
| Dimensions Without Stand | 947.7 × 419.8 × 106.3 mm |
| Weight With Stand | 14.1 kg |
| Weight Without Stand | 9.2 kg |
| Stand Depth | 260 mm |
| Bezel Design | 3-sided virtually borderless design |
Power & Operating Conditions 12
| Specification | Value |
|---|---|
| 110V Input Range | 100–120V |
| 220V Input Range | 220–240V |
| AC Frequency | 50–60 Hz |
| Average Power Consumption | 45 W |
| Sleep Consumption | 0.5 W |
| Off Consumption | 0.3 W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–80% |
| Operating Altitude | 5000 m |
| Storage Temperature | -20–60°C |
| Storage Humidity | 5–85% |
| Storage Altitude | 12192 m |
Eye Care, Protection & Additional Features
7
| Specification | Value |
|---|---|
| Flicker-Free | Yes |
| Low Blue Light | Yes |
| Reader Mode | Yes |
| Ambient Light Sensor | Yes |
| Desktop Control Software | Dual Controller |
| Auto Input Switching | Yes |
| Additional Monitor Features |
|
Certifications, Standards & Licenses 7
| Specification | Value |
|---|---|
| Energy Star | Certified |
| RoHS | Compliant |
| CE | Certified |
| FCC-B | Certified |
| J-Moss | Compliant |
| UL | UL (cUL) |
| VCCI | Certified |
Included Accessories
4
| Specification | Value |
|---|---|
| HDMI Cable | Included |
| DisplayPort Cable | Included |
| USB-C Cable | Included |
| USB Type-C Cable | Included |
Packaging Information 2
| Specification | Value |
|---|---|
| Package Dimensions | 1206 × 534 × 201 mm |
| Package Weight | 17.8 kg |
⚡
Estimated Running Cost
Based on this product's rated power draw, not an independent lab measurement — actual usage varies with settings and content.
Daily₹2.16
Monthly₹64.80
Annually₹788
Draws less power than 67% of the 701 comparable displays we track.