LG 34U640B-B UltraWide review

LG 34U640B-B is a midrange office ultrawide that covers the features most laptop users ask for. LG lists a 34-inch 21:9 WQHD curved display with an 1800R curve and a 144Hz refresh rate with AMD FreeSync Premium, so it doubles for casual gaming. The USB Type-C port carries display, data and up to 65W charging, which matches the Dell S3425DW, and LG adds KVM switch support so one keyboard and mouse can control two PCs. Color is listed as up to 99% sRGB with HDR10 support. The LG Switch app splits the screen into custom layouts, though it needs a software install. The stand offers tilt and height adjustment with narrow bezels. LG does not publish a DCI-P3 figure on the product page, and it lists no Ethernet port, so it is not a full dock like the UltraSharp models. LG.com did not show a USD price in the page text we fetched, so check the current price before you buy. We compared documented features and published prices only.

Who it is for

office buyers who want USB-C and KVM without UltraSharp pricing

Price

See vendor pricing (USD check pending).

US price check pending. See the vendor pricing page.

Key features

• 34-inch 21:9 UltraWide WQHD curved (1800R) display
• 144Hz refresh rate with AMD FreeSync Premium
• USB Type-C with display, data and up to 65W charging
• KVM switch support for two PCs with one keyboard and mouse
• Up to 99% sRGB and HDR10 support

Strengths and weaknesses

• Strength: Pairs a 65W USB-C port with a KVM switch, which the cheaper Dell S3425DW does not list
• Strength: 144Hz is faster than the 120Hz office picks from Dell
• Strength: LG Switch app splits the screen into custom layouts
• Weakness: Color gamut is quoted in sRGB only, with no DCI-P3 figure on LG's page
• Weakness: Stand adjusts for tilt and height only, with no swivel listed
• Weakness: USD price did not show in the page text we checked

Key facts

• Price checked: USD check pending
• Size and resolution: 34 inch WQHD, 21:9
• Refresh rate: 144Hz
• Curve: 1800R
• Laptop charging: Up to 65W over USB-C

Where it ranks

LG 34U640B-B UltraWide is No. 6 in our Best Ultrawide Monitors verdict.