Display
34 in, VA, 3440 × 1440
34
Refresh Rate
48–144 Hz
48
Brightness
300 nits
Contrast Ratio
4000:1
4000
Overview
The LG UltraWide 34U640B is the most work-friendly of LG’s 2026 34-inch curved models in this set because it adds genuine docking features to the familiar 3440 × 1440 VA platform. The 1800R panel reaches 144 Hz, carries a 4000:1 contrast rating and produces 10-bit output through 8-bit plus FRC, with 99% sRGB coverage and factory calibration listed. Its USB-C upstream port handles DisplayPort Alt Mode and up to 65W power delivery, while two USB-A ports and the KVM function make it easier to share peripherals between systems. Two HDMI 2.0 inputs and DisplayPort 1.4 cover conventional sources. Picture-by-Picture and Picture-in-Picture are also useful on an ultrawide screen. The compromises are familiar: 300 nits brightness, basic HDR10 support and a 5 ms minimum response claim. The stand raises by 80 mm and tilts, but does not swivel or pivot. For a laptop-plus-desktop workspace that also sees regular gaming, the 34U640B is the most complete all-rounder of the three related UltraWide models.
BrandLG UltraWidePanel34-inch 1800R VAResolution3440 × 1440Refresh Rate48–144 HzUSB-C65W DP Alt Mode
Key Highlights
- 144 Hz curved ultrawide display
- 4000:1 VA contrast and 99% sRGB
- USB-C with 65W power delivery
- Two USB-A ports and KVM switch
- PbP and PiP multi-source modes
Who Should Buy the LG 34U640B
+ Best For
Laptop users wanting one-cable video and charging
Hybrid desks shared between two computers
Wide productivity plus mainstream gaming
Users who value VA contrast
× Not Ideal For
Laptops that require more than 65W charging
Competitive OLED-level gaming
Strong HDR production or mastering
Users needing swivel or portrait rotation
Display Performance
Resolution
3440 × 1440 at 109 ppi
Sharp, wide workspace
Refresh Rate
48–144 Hz
Smooth for work and gaming
Response Time
5 ms minimum
Suitable for mixed use
Brightness
300 nits
Indoor-focused
Contrast
4000:1
Strong VA dark-scene performance
USB-C
65W with DP Alt Mode
Practical laptop docking
Gaming Performance
Refresh Rate144 HzGood mainstream gaming speed
Adaptive SyncFreeSync PremiumReduces tearing with compatible Radeon systems
Gaming ToolsBlack Stabilizer, Crosshair and Dynamic Action SyncCommon LG aids
PanelVA at 4000:1Strong contrast, with slower quoted response than esports screens
HDR & Brightness Reality
HDR10 is accepted, but the monitor is specified at 300 nits with no separate peak-brightness or local-dimming figure. The 4000:1 VA contrast helps, yet HDR remains a compatibility feature rather than a reason to choose this model.
Connectivity & Ports
USB-C1× USB-C 3.0, DP Alt Mode, 65WVideo, data and laptop power
USB Hub2× USB-A 3.2 at 5 GbpsConnects peripherals
HDMI2× HDMI 2.0Two additional sources
DisplayPort1× DisplayPort 1.4Desktop PC input
KVMYesSupports shared keyboard and mouse workflows
Desk Fit & Ergonomics
Height Adjustment80 mmUseful but limited travel
Tilt5° forward / 15° backwardBasic angle control
Swivel / PivotNo / NoStand remains landscape and forward-facing
VESA100 × 100 mmArm mounting available
Weight7.7 kg with standRequires a suitably rated arm
Real-World Use Cases
one cable handles display, data and up to 65W power
KVM and USB hub reduce peripheral swapping
timelines and parallel windows benefit from the width
144 Hz and FreeSync Premium provide smooth play
Pros & Cons
Pros
- USB-C docking with 65W power
- KVM switch and USB hub
- 144 Hz ultrawide panel
- Strong 4000:1 contrast
- Two HDMI ports plus DisplayPort
Cons
- Only 300-nit brightness
- Basic HDR support
- No swivel or pivot
- 5 ms response claim
- 65W may be insufficient for powerful laptops
Score & Ratings
8.2/10
Great
Model Information
11
| Specification | Value |
|---|---|
| Brand | LG |
| Series | UltraWide |
| Model | 34U640B |
| Model Alias | 34U640B-B |
| Full Product Name | LG UltraWide 34U640B |
| Model Year | 2026 |
| Monitor Type | UltraWide Monitor |
| Region / Variant | US / India / Japan |
| Launch Status | Available |
| Available Colors | Black |
| Warranty | 1 year (US) |
Display & Panel
14
| Specification | Value |
|---|---|
| Screen Size | 34 in |
| Exact Diagonal | 34.14 in |
| Screen Shape | Curved |
| Radius of Curvature | 1800R |
| Screen Format | UltraWide |
| Aspect Ratio | 2.389:1 |
| Active Display Width | 797.22 mm |
| Active Display Height | 333.72 mm |
| Display Area | 91.6% |
| Panel Type | VA |
| Backlight Type | W-LED |
| 3D Support | No |
| Screen Coating | Anti-glare/Matte |
| Coating Hardness | 3H |
Resolution & Pixel Details
4
| Specification | Value |
|---|---|
| Native Resolution | 3440 × 1440 |
| Resolution Name | WQHD |
| Pixel Density | 109 ppi |
| Pixel Pitch | 0.232 mm |
Picture Quality & Color
9
| Specification | Value |
|---|---|
| Panel Bit Depth | 10-bit (8-bit + FRC) |
| FRC | Yes |
| Display Colors | 1.07 billion |
| Total Color Bits | 30-bit |
| Typical Brightness | 300 nits |
| HDR Support | Yes |
| HDR Formats | HDR10 |
| sRGB Coverage | 99% |
| Factory Calibration | Yes |
Refresh Rate, Response & Gaming
8
| Specification | Value |
|---|---|
| Refresh Rate Range | 48–144 Hz |
| Minimum Response Time | 5 ms |
| AMD FreeSync | Premium |
| Black Stabilizer | Yes |
| Crosshair | Yes |
| Dynamic Action Sync | Yes |
| Picture-by-Picture | Yes |
| Picture-in-Picture | Yes |
Ports & Connectivity
12
| Specification | Value |
|---|---|
| HDMI Ports | 2× HDMI 2.0 |
| HDMI Version | HDMI 2.0 |
| DisplayPort Input | 1× DisplayPort 1.4 |
| DisplayPort Version | DisplayPort 1.4 |
| DisplayPort Alt Mode | Yes |
| HDCP Support | Yes |
| HDCP Version | HDCP 2.2 |
| USB-C Input | 1× USB-C 3.0 |
| USB-C Power Delivery | 65W |
| USB-A Ports | 2× USB-A 3.2, 5 Gbps |
| KVM Switch | Yes |
| Audio Output | 3.5 mm |
Audio, Camera, Network & Smart Features
1
| Specification | Value |
|---|---|
| Built-In Camera | No |
Ergonomics & Stand
9
| Specification | Value |
|---|---|
| VESA Mount | Yes |
| Removable Stand | Yes |
| Height Adjustment | Yes |
| Height Adjustment Range | 80 mm |
| Tilt Adjustment | Yes |
| Forward Tilt | 5° |
| Backward Tilt | 15° |
| Swivel Adjustment | No |
| Pivot Adjustment | No |
Dimensions, Weight & Design
4
| Specification | Value |
|---|---|
| Weight With Stand | 7.7 kg |
| Weight Without Stand | 5.6 kg |
| Stand Depth | 220 mm |
| Bezel Design | 3-sided frameless design |
Power & Operating Conditions
10
| Specification | Value |
|---|---|
| 110V Input Range | 100–120V |
| 220V Input Range | 220–240V |
| AC Frequency | 50–60 Hz |
| Average Power Consumption | 45 W |
| Sleep Consumption | 0.8 W |
| Off Consumption | 0.3 W |
| Operating Temperature | 0–40°C |
| Operating Humidity | 10–80% |
| Storage Temperature | -20–60°C |
| Storage Humidity | 5–85% |
Eye Care, Protection & Additional Features
7
| Specification | Value |
|---|---|
| Flicker-Free | Yes |
| Reader Mode | Yes |
| Desktop Control Software | Dual Controller |
| Monitor Management Software | LG Switch |
| Auto Input Switching | Yes |
| Smart Energy Saving | Yes |
| Additional Monitor Features | Color WeaknessDual ControllerHDR EffectSuper Resolution+ |
Certifications, Standards & Licenses
7
| Specification | Value |
|---|---|
| RoHS | Compliant |
| CE | Certified |
| FCC-B | Certified |
| J-Moss | Compliant |
| PSE | Certified |
| UL | UL (cUL) |
| TÜV Type Approval | TÜV Type |
Included Accessories
4
| Specification | Value |
|---|---|
| HDMI Cable | Included |
| DisplayPort Cable | Included |
| USB-C Cable | Included |
| USB Type-C Cable | Included |
Packaging Information
4
| Specification | Value |
|---|---|
| Package Width | 986 mm |
| Package Height | 470 mm |
| Package Depth | 188 mm |
| Package Weight | 10.4 kg |
Frequently Asked Questions
01 What separates the 34U640B from the 34U620B? +
The major addition is USB-C with 65W power delivery, two USB-A ports and KVM functionality.
02 Can it charge every laptop? +
It supplies up to 65W, which is enough for many thin-and-light systems but may not cover high-performance laptops.
03 Does it support two pictures at once? +
Both Picture-by-Picture and Picture-in-Picture are listed.
04 Is the panel native 10-bit? +
It uses 8-bit plus FRC to provide the listed 10-bit output.
05 How adjustable is the stand? +
It has 80 mm height adjustment and tilt, but no swivel or pivot.
Reviews
DISPLAYINPUT · INDEPENDENT · SPEC-BASED · NO SPONSORED PLACEMENT
SHEET № 34U640B