RATED
Great
8.2/10
34″ LG 34U640B – Specs & Features
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.
LG●Monitor
Display
34 in, VA, 3440 × 1440
34
Refresh Rate
48–144 Hz
48
Brightness
300 nits
Contrast Ratio
4000:1
4000
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 |
34" Display Size (86.4 cm) 21:9
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 |
DESK DISTANCE FIT
65cm
CompactIdeal FitWideUltra-Wide
Fills more of your view — great for productivity, may need slight head turns toward the edges.
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 |
Ports & Connections
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 |
⚡
Estimated Running Cost
Based on this product's rated power draw, not an independent lab measurement — actual usage varies with settings and content.
Daily—
Monthly—
Annually—
Uses about 63% less power than the average we track in this category.
Reviews
DISPLAYINPUT · INDEPENDENT · SPEC-BASED · NO SPONSORED PLACEMENT
SHEET № 34U640B