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LG UltraFine 27US550-W 27" specifications and in-depth review

LG UltraFine 27US550-W 27"

Manufacturer: LG

The LG UltraFine 27US550-W is a 27-inch LCD monitor built around an IPS panel with LED backlighting, delivering a 3840x2160 (4K UHD) resolution at 163 pixels per inch. It carries a matte, anti-glare surface and supports a broad range of ergonomic adjustments including tilt, swivel, height, and portrait mode rotation, along with VESA mount compatibility.

On the color side, the display offers 10-bit color depth covering up to 1.07 billion colors, a typical brightness of 300 nits, and a 1000:1 contrast ratio, with wide viewing angles of 178 degrees both horizontally and vertically. Connectivity options include two HDMI ports, one DisplayPort 1.4 output, and a 3.5mm audio jack, while the panel carries a 5ms response time and draws just 0.5W in standby.

Pros
  • 4K UHD resolution at 3840x2160 across a 27-inch panel results in a sharp 163 ppi pixel density, making text and fine detail noticeably crisp
  • IPS panel technology provides wide 178-degree viewing angles both horizontally and vertically, keeping image quality consistent from off-center positions
  • Matte panel with anti-glare coating reduces reflections in bright environments without relying on a glossy surface
  • Ergonomic stand supports tilt, swivel, height adjustment, and portrait mode rotation, offering meaningful flexibility for different setups
  • VESA mount compatibility allows the display to be used with third-party monitor arms or wall mounts
  • 10-bit color depth with support for over 1 billion colors enables smooth gradients and detailed color rendering
Cons
  • Refresh rate is limited to 60Hz with no adaptive synchronization support, which restricts use in fast-paced or frame-rate-sensitive scenarios
  • No USB ports of any kind are available on the monitor, limiting peripheral connectivity directly through the display
  • Built-in speakers are absent, requiring a separate audio solution for sound output
  • Picture-in-Picture mode is not supported, preventing simultaneous viewing of multiple input sources
  • No USB Type-C input is available, which limits connectivity options for modern laptops and devices that rely on that interface
Who is this for?

This monitor suits users who prioritize sharp image detail and accurate color rendering in their daily work, such as those in photo editing, graphic design, or content review, where the 4K resolution, 10-bit color depth, and wide IPS viewing angles make a tangible difference. The flexible ergonomic stand — with tilt, swivel, and portrait mode support — makes it a practical fit for professionals who frequently adjust their workspace setup, while VESA compatibility adds further adaptability for those who prefer a monitor arm or wall mount configuration.

Who is this NOT for?

Users looking for a display suited to fast-paced gaming or high frame-rate applications will find this monitor limiting, as its 60Hz refresh rate and lack of any adaptive synchronization technology are inadequate for smooth competitive or action-heavy gameplay. It is equally unsuitable for those who rely on a monitor as a USB hub or connectivity hub, since there are no USB ports, no USB Type-C input, and no Thunderbolt support, meaning users with modern laptops or peripheral-heavy setups will need to look elsewhere for that kind of versatility.

Display:

Display type LED-backlit, LCD, IPS
response time 5 ms
screen size 27"
resolution 3840 x 2160 px
pixel density 163 ppi
Adaptive synchronization None
has anti-glare coating ✓
refresh rate 60Hz
maximum horizontal viewing angle 178º
maximum vertical viewing angle 178º
has a matte panel ✓
has a glossy panel ✕
has a touch screen ✕

The LG UltraFine 27US550-W features a 27-inch IPS panel with LED backlighting, delivering a 3840x2160 resolution at a pixel density of 163 ppi. The display runs at a 60Hz refresh rate with a 5ms response time, and no adaptive synchronization technology is supported. Its matte surface includes an anti-glare coating, keeping reflections in check without a glossy finish, and wide viewing angles of 178 degrees both horizontally and vertically ensure consistent image quality across a broad range of positions. Touch input is not available on this panel.

General info:

Type Standard
supports total tilt ✓
Has a swivel stand ✓
Supports VESA mount ✓
height 363 mm
width 613 mm
thickness 45 mm
weight 6800 g
supports portrait mode ✓
volume 10013.355 cm³

The LG UltraFine 27US550-W is a standard-type monitor measuring 613 mm wide, 363 mm tall, and 45 mm thick, with a total volume of 10013.355 cm³ and a weight of 6800 g. It offers a solid set of ergonomic options, including tilt, swivel, and portrait mode rotation, giving users meaningful flexibility in how they position the screen. VESA mount support is also included, making it compatible with third-party arms and wall-mounting solutions.

Colors:

brightness (typical) 300 nits
supports color calibration ✕
display colors 1070 million
bit depth 10-bit
contrast ratio 1000:1

The display supports 10-bit color depth, allowing it to render up to 1070 million colors for smooth gradients and detailed tonal transitions. Typical brightness is rated at 300 nits, paired with a 1000:1 contrast ratio that provides a reasonable range between the darkest and brightest areas of the image. Hardware color calibration is not supported on this monitor.

Connectivity:

HDMI ports 2
supports Thunderbolt ✕
DisplayPort outputs 1
DisplayPort version DisplayPort 1.4
has a socket for a 3.5 mm audio jack ✓
has a DVI connector ✕
USB ports 0
Has USB Type-C ✕
supports Ethernet ✕
supports Wi-Fi ✕
has AirPlay ✕
mini DisplayPort outputs 0
has a VGA connector ✕

The LG UltraFine 27US550-W provides two HDMI ports and one DisplayPort 1.4 output for video input, along with a 3.5mm audio jack for headset connectivity. There are no USB ports of any kind on this monitor, and it does not include USB Type-C, DVI, VGA, or mini DisplayPort connections. Networking and wireless features are absent as well, with no support for Ethernet, Wi-Fi, or AirPlay, and Thunderbolt is not supported.

Power:

standby power consumption 0.5W

The only available power specification for this monitor is its standby power consumption of 0.5W, indicating a low draw when the display is not in active use.

Features:

has PiP ✕
has stereo speakers ✕
has built-in smart TV ✕
has a remote control ✕
supports Dolby Digital ✕
supports Dolby Digital Plus ✕
has DTS Surround ✕
has an ambient light sensor ✕
has a front camera ✕

The LG UltraFine 27US550-W is a straightforward display that omits a number of common monitor extras. It has no built-in speakers and does not support any audio formats, including Dolby Digital, Dolby Digital Plus, or DTS Surround. Picture-in-Picture mode is not available, nor is there a remote control, ambient light sensor, front camera, or built-in smart TV functionality.

Final Verdict

The LG UltraFine 27US550-W is a well-rounded 4K IPS monitor that earns its place in professional and productivity-focused environments, where its 3840x2160 resolution with 10-bit color depth and wide viewing angles deliver a consistently detailed and color-rich experience. Its ergonomic flexibility and VESA compatibility add genuine everyday practicality, though users should be aware that its 60Hz refresh rate and limited connectivity options — particularly the absence of USB ports and USB Type-C — define a clear boundary around its intended use. For those whose priorities align with sharp visuals and adaptable desk setups rather than high-frame-rate performance or hub-style connectivity, this monitor represents a focused and coherent choice.

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