LG 24U421A-B 24″ 100Hz Monitor

24 inch · 1920 x 1080 · 100 Hz · VA

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Screen size 24 inch
Resolution 1920 x 1080
Refresh rate 100 Hz
Panel VA
Response time 5 ms

LG 24U421A-B 24″ 100Hz Monitor is a 24-inch monitor with 1920 x 1080 resolution, a 100 Hz refresh rate and VA panel. Fine for work and everyday use; for fast shooters look at 144 Hz and up. It came out in 2026.

Released: 2026-04-21

Specifications

Key specs

Screen size: 24 inch
Resolution: 1920 x 1080
Refresh rate: 100 Hz
Panel: VA
Response time: 5 ms
Released: 2026-04-21
Part number: 24U421A-B.AWMQ

Display

Display diagonal: 60.5 cm (23.8")
Display resolution: 1920 x 1080 pixels
HD type: Full HD
Native aspect ratio: 16:9
Display technology: LED
Panel type: VA
Display brightness (typical): 250 cd/m²
Response time: 5 ms
Response time measurement type: GTG (Gray to Gray)
Screen shape: Curved
Screen curvature rating: 1500R
Contrast ratio (typical): 1000:1
Maximum refresh rate: 100 Hz
Viewing angle, horizontal: 178°
Viewing angle, vertical: 178°
Display number of colours: 16.7 million colours
Pixel pitch: 0.2745 x 0.2745 mm
Display diagonal (metric): 60.4 cm
High Dynamic Range (HDR) supported: Yes
High Dynamic Range (HDR) technology: High Dynamic Range 10 (HDR10)
Colour gamut standard: sRGB
sRGB coverage (typical): 99%

Performance

Flicker-free technology: Yes

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Design

Market positioning: Consumer
Product colour: Black

Ports & interfaces

USB Power Delivery (USB PD): Yes
USB Power Delivery up to: 15 W
HDMI: Yes
HDMI ports quantity: 1
HDMI version: 2.0
Headphone out: Yes
HDCP: Yes
HDCP version: 2.2

Ergonomics

VESA mounting: Yes
Panel mounting interface: 100 x 100 mm
Tilt adjustment: Yes

Power

Energy efficiency class (SDR): E
Energy efficiency class (HDR): F
Energy consumption (SDR) per 1000 hours: 17 kWh
Energy consumption (HDR) per 1000 hours: 22 kWh
Power consumption (typical): 17 W
Power consumption (off): 0.3 W
AC input voltage: 100 - 240 V
AC input frequency: 50/60 Hz
Power supply type: External
Energy efficiency scale: A to G

Weight & dimensions

Width (with stand): 536.3 mm
Depth (with stand): 170 mm
Height (with stand): 411.9 mm
Weight (with stand): 2.92 kg
Width (without stand): 536.3 mm
Depth (without stand): 44.3 mm
Height (without stand): 320.1 mm
Weight (without stand): 2.24 kg

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About this product

Vivid colors with precision Our FHD (1920x1080) screen delivers clear visuals with an sRGB 99% (Typ.) color gamut and a 1500R curvature, enhancing work productivity. Fluid visuals. Seamless workflow. A fast 100Hz provides a smooth frame loading in various programs. Also, you can enjoy realistic gameplay with less screen stuttering and motion blur. One port to meet your needs Connect your laptop to the monitor with a USB-C cable** for up to 15W of power delivery and display connectivity. Dynamic Action Sync Reducing input lag with Dynamic Action Sync, gamers can catch critical moments in real time and respond quickly. Black Stabilizer Black Stabilizer helps gamers detect snipers lurking in the darkest corners and swiftly navigate flash explosions. Switch swiftly LG Switch app helps to optimize the monitor to your work and life. You can readily divide the whole display up to 6, change the theme design, or even launch a video call platform with a mapped hotkey. Fully use your desk The slim stand takes up little space, allowing you to utilize your workspace efficiently.

24U421A-B vs similar monitors

	LG 24U421A-B 24″ 100Hz Monitor	LG 22U401A-B 22″ 100Hz Monitor	LG 22MR410-B 21″ 100Hz Monitor	LG 32MR50C-B 32″ 100Hz Monitor
Screen size	24 inch	22 inch	21 inch	32 inch
Resolution	1920 x 1080	1920 x 1080	1920 x 1080	1920 x 1080
Refresh rate	100 Hz	100 Hz	100 Hz	100 Hz
Panel	VA	VA	VA	VA
Response time	5 ms	5 ms	5 ms	5 ms
Released	2026	2026	2026	2026