34" LG UltraWide 34U640B-B
34" LG UltraWide 34U640B-B
The LG UltraWide 34U640B-B curved monitor offers an expansive 34" workspace with a 21:9 aspect ratio and WQHD resolution of 3440×1440 pixels. The 1800R curvature more naturally envelops your field of view, while the three-sided, virtually borderless design accentuates the wide image for work, content viewing, and gaming. The VA panel provides a typical contrast of 4000:1, supports HDR10 and covers 99% of the sRGB space. The USB-C interface transmits video and data while being able to power a compatible laptop with up to 65W. The monitor also offers a refresh rate of up to 144Hz, AMD FreeSync Premium, Dynamic Action Sync and Black Stabilizer features, the LG Switch app, and Dual Controller for convenient work with two computers.
34"
Screen Size
3440 × 1440 (WQHD)
Resolution (Resolution Type)
VA Panel
Display Type
144Hz
Refresh Rate
5ms (GtG)
Response Time
Key Features of the LG UltraWide 34U640B-B Monitor
- 34" curved VA display with a 21:9 aspect ratio
- WQHD resolution of 3440×1440 pixels
- 1800R screen curvature
- Three-sided, virtually borderless design
- Refresh rate up to 144Hz
- 5ms GtG response time in Faster mode
- Typical brightness of 300 cd/m²
- Typical contrast ratio of 4000:1
- Typical coverage of 99% of the sRGB space
- Displays approximately 1.07 billion colours
- HDR10 support and factory colour calibration
- AMD FreeSync Premium and Variable Refresh Rate (VRR)
- Dynamic Action Sync and Black Stabilizer
- Crosshair, FPS Counter, and Motion Blur Reduction
- USB-C with video, data transfer, and power delivery up to 65W
- Dual Controller with KVM support
- Picture-in-Picture (PIP) and Picture-by-Picture (PBP)
- LG Switch app with 11 desktop layouts
- Reader Mode and Flicker Safe
- Height-adjustable stand with tilt capability
- VESA 100×100mm mounting
- 2× HDMI, DisplayPort 1.4, USB-C, and 2× USB-A
Wide 21:9 Aspect Ratio Workspace
The UltraWide WQHD resolution of 3440×1440 pixels provides significantly more horizontal space than a standard 16:9 screen. You can display multiple applications, documents, timelines, or previews side-by-side without constantly switching windows. The 1800R curvature mimics the natural field of view, helping to reduce distortion when viewing the edges of the wide screen. The LG UltraWide 34U640B-B thus creates a clear environment for multitasking and a more immersive space for multimedia and games.
HDR10 and Accurate Colour Reproduction
HDR10 support helps to render a wider range of detail in both the bright and dark parts of compatible content. The monitor typically covers 99% of the sRGB colour space and is factory colour-calibrated. The VA panel also achieves a typical contrast ratio of 4000:1 and can display approximately 1.07 billion colours. The image therefore offers rich shades, deeper dark tones, and a more natural reproduction of photos, videos, and gaming scenes.
144Hz Refresh Rate for Smoother Motion
A refresh rate of up to 144Hz provides smoother motion when gaming, watching videos, and scrolling through content. The image updates more frequently than on standard 60Hz monitors, so fast-paced scenes appear clearer and with less blur. A 5ms GtG response time in Faster mode further helps to keep moving objects sharper. The higher frequency is an advantage when playing action titles and working with dynamic images.
AMD FreeSync Premium for Uninterrupted Gaming
AMD FreeSync Premium technology synchronises the monitor's refresh rate with the frame rate of a compatible graphics card. This helps to reduce screen tearing, stuttering, and distracting transitions when game performance fluctuates. Thanks to adaptive synchronisation, gaming scenes appear more seamless, smoother, and with lower latency. The monitor also supports Variable Refresh Rate (VRR).
Dynamic Action Sync – Faster Response to In-Game Action
The Dynamic Action Sync feature helps to reduce the input lag between your command and its display on the monitor. Mouse movements, button presses, or other actions can therefore appear faster. In competitive gaming, it allows you to react more promptly to key moments.
Black Stabilizer – More Detail in Dark Scenes
Black Stabilizer brightens the darker parts of the image and improves the visibility of details hidden in the shadows. This allows you to better distinguish opponents, obstacles, or objects in dark rooms and during rapid changes in lighting. The feature gives you a clearer view without having to significantly brighten the entire scene.
USB-C with Video, Data, and 65W Power Delivery
The USB-C interface simplifies connecting a compatible laptop to the monitor. A single cable allows you to transmit the video signal and data while simultaneously charging the device with up to 65W of power. The two downstream USB-A 3.2 Gen 1 ports can be used for a keyboard, mouse, or other peripherals. The LG UltraWide 34U640B-B can thus function as a practical foundation for a workstation with fewer cables.
Dual Controller for Working with Two Computers
The Dual Controller feature with KVM support allows you to work with two computers using a single monitor, keyboard, and mouse. You can conveniently switch between connected devices and drag and drop files from one computer to the other. The wide screen, along with PIP and PBP features, makes it easy to display content from multiple sources simultaneously. The availability of some options may vary depending on the connected devices, operating system, and region.
Reader Mode and Flicker Safe for More Comfortable Viewing
Reader Mode adjusts the brightness and colour temperature to make the image more comfortable on the eyes when reading documents and working for long periods. The warmer colour reproduction reduces the amount of blue light and more closely resembles the appearance of a paper page. At the same time, Flicker Safe technology minimises invisible backlight flicker. Both features help reduce eye fatigue during a long day of work or study.
Height-Adjustable Stand and Clean Design
The three-sided, virtually borderless design focuses attention on the screen and promotes a modern look for your work setup. The slim stand takes up less space on your desk and can be easily attached to the monitor using the One Click Stand system. You can adjust the screen height within an 80mm range and set the tilt from −5° to +15°. The monitor can also be mounted on a VESA 100×100mm compatible stand or arm.
Technical Specifications of the Monitor
- Screen Size: 34" / 86.42cm
- Resolution: 3440×1440 pixels
- Panel Type: VA
- Aspect Ratio: 21:9
- Curvature: 1800R
- Refresh Rate: up to 144Hz
- Response Time: 5ms GtG in Faster mode
- Typical Brightness: 300 cd/m²
- Minimum Brightness: 240 cd/m²
- Typical Contrast Ratio: 4000:1
- Minimum Contrast Ratio: 3000:1
- Typical Colour Coverage: 99% sRGB
- Minimum Colour Coverage: 95% sRGB
- Colour Depth: approximately 1.07 billion colours
- Viewing Angles: 178° horizontal and vertical
- Pixel Pitch: 0.23175×0.23175mm
- HDR: HDR10, HDR Effect
- Synchronisation: AMD FreeSync Premium, VRR
- Stand Adjustment: height and tilt
- Height Adjustment: 80mm
- Tilt Range: −5° to +15°
- VESA Mounting: 100×100mm
- Dimensions with Stand: 809.1×464.4×220mm
- Dimensions without Stand: 809.1×359×91.5mm
- Weight with Stand: 7.7kg
- Weight without Stand: 5.6kg
- Power: external adapter
- Typical Power Consumption (On): 45W
- Power Consumption (Sleep Mode): less than 0.5W
- Power Consumption (Off): less than 0.3W
Interfaces
- 2× HDMI
- 1× DisplayPort 1.4
- 1× USB-C with video and data transfer
- USB-C Power Delivery up to 65W
- 2× USB-A 3.2 Gen 1
- 1× 3-pole 3.5mm headphone output
Colour Coverage (Gamut)
Determines how accurately a monitor can display colours. sRGB is ideal for web, films, or games. DCI-P3/Adobe RGB is appreciated by graphic designers or professionals. The higher the stated value, the better the monitor displays colours. Maximum Brightness
A value given in nits or cd/m² that determines the brightness level of the monitor. Brightness above 400 nits is crucial for HDR content and readability in sunlight, while standard office monitors are sufficient with values above 250. Refresh Rate and Response Time
Refresh rate (Hz) determines the number of frames displayed per second; the higher the value, the smoother the picture and the less eye strain. A lower response time value (ms) eliminates motion blur. 144Hz+ is ideal for gaming, while values around 75Hz are suitable for office monitors.Specifications
Display diagonal and resolution
Construction
Panel and screen technology
Aspect Ratio
Backlight and colour
Connection
Colour gamut
Features and functions
Colour
Dimensions and weight
Packaging
Power outlet type
Energy specifications
LG electronics INC. Alfred-Herrhausen-Allee 3-5, 65760 Eschborn, Germany, [email protected], +49 6196 7883000
Specifications can be changed without notice. Images are for illustrative purposes only.
