The 21:9 aspect ratio and 3440 × 1440 resolution give one screen as much width as two standard monitors, without bezels down the middle. A document and a browser fit side by side, as does a long editing timeline or a large spreadsheet next to its chart. Pixel density is 110 ppi, so text stays sharp even across 34 inches, and picture-in-picture mode shows a second source in a small window.
On a flat ultrawide you would have to turn your head to see the edges; the 1800R curve brings them closer to you. The whole image sits more evenly in your field of view, and games feel more immersive. The VA panel delivers a 4000:1 contrast ratio, so a dark scene is genuinely dark rather than greyish, which is clearly visible in films and night-time game scenes. Viewing angles are 178°.
A refresh rate of up to 144 Hz is more than twice as fluid as a standard 60 Hz monitor, so fast movement and scrolling look noticeably cleaner. AMD FreeSync Premium matches the refresh rate to your graphics card's frame rate and prevents screen tearing. Response time is 5 ms, and a game mode lets you switch picture settings for a game in moments.
The panel covers 99% of the sRGB colour space and shows 1.07 billion colours, which is enough for accurate viewing of web graphics, photos and presentations. Typical brightness is 300 cd/m². HDR10 support and the LG HDR Effect mode let you watch HDR video and add contrast to standard content. Flicker-free backlighting reduces eye strain over a long working day.
The monitor has two HDMI 2.0 ports, a DisplayPort 1.4, a built-in USB hub and a headphone output. DisplayPort, HDMI and USB Type-C cables are in the box. The stand adjusts for height and tilt, and the VESA 100 × 100 mount lets you put the monitor on an arm instead. The power supply is external. It weighs 7.7 kg with the stand and 5.6 kg without, and measures 810 × 221 × 465 mm with the stand.
Office workers and analysts who keep several windows open and want one wide screen instead of two monitors; video and audio editors who value a long timeline; gamers who want an ultrawide field of view with 144 Hz smoothness; and film fans who like the deep blacks of a VA panel.
| Brand | LG |
|---|---|
| Model name | 34U640B-B |
| Product colour | Black |
| VESA mounting | Yes |
| Pixel pitch | 0.23175 x 0.23175 |
| AMD FreeSync | Yes |
| Headphone out | Yes |
| Tilt adjustment | Yes |
| AMD FreeSync type | FreeSync Premium |
| Height adjustment | Yes |
| Picture-in-Picture | Yes |
| Viewing angle, vertical | 178 |
| Viewing angle, horizontal | 178 |
| EAN | 8806096743171 |
| Display diagonal | 34″ |
|---|---|
| Display resolution | 3440 x 1440 |
| HD type | Wide Quad HD |
| Panel type | VA |
| Maximum refresh rate | 144 Hz |
| Native aspect ratio | 21:9 |
| Touchscreen | No |
| Colour gamut | 99 % |
| Pixel density | 110 ppi |
| Contrast ratio (typical) | 4000:1 |
| High Dynamic Range (HDR) supported | Yes |
| High Dynamic Range (HDR) technology | HDR Effect/High Dynamic Range 10 (HDR10) |
| Screen shape | Curved |
| Panel mounting interface | 100 x 100 |
| Response time | 5 |
| Colour gamut standard | sRGB |
| Screen curvature rating | 1800R |
| Display number of colours | 1.07 billion colours |
| Display brightness (typical) | 300 |
| HDMI ports quantity | 2 |
|---|---|
| HDMI version | 2.0 |
| HDMI | Yes |
| Built-in USB hub | Yes |
| DisplayPorts quantity | 1 |
| DisplayPort out version | 1.4 |
| Power consumption (standby) | 0.5 W |
|---|---|
| Energy efficiency class | F |
| Energy efficiency class (SDR) | F |
| Energy efficiency class (HDR) | G |
| Energy consumption (SDR) per 1000 hours | 30 kWh |
| Energy consumption (HDR) per 1000 hours | 39 kWh |
| AC input voltage | 100 – 240 V |
| Power supply type | External |
| Energy efficiency scale | A to G |
| Power consumption (off) | 0.3 |
| Game mode | Yes |
|---|
| Cables included | DisplayPort/HDMI/USB Type-C |
|---|---|
| Package type | Box |
| Flicker-free technology | Yes |
| Width (with stand) | 810.26 mm |
|---|---|
| Height (with stand) | 464.82 mm |
| Depth (with stand) | 220.98 mm |
| Weight (with stand) | 7.71 kg |
| Width (without stand) | 810.26 mm |
| Height (without stand) | 358.14 mm |
| Depth (without stand) | 91.44 mm |
| Weight (without stand) | 5.58 kg |
Yes, it has a VESA 100 × 100 mount that fits standard wall mounts and monitor arms.
A USB Type-C cable is included, but the manufacturer does not specify any USB-C charging power. Do not count on charging a laptop from this monitor.
The manufacturer does not specify built-in speakers. There is a headphone output for headphones or powered speakers.
Yes, the stand adjusts for height and tilt. The swivel range is not specified by the manufacturer.
The manufacturer lists HDMI version 2.0, DisplayPort version 1.4 and a 144 Hz maximum. Through which port 144 Hz is reached, the manufacturer does not specify.
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