Optoma ZK431ST 4K UHD Short-Throw Laser DLP Projector - White

Tight rooms get a sharp 4K UHD image from just feet away with the Optoma ZK431ST, a compact 4,100-lumen short-throw laser DLP projector.

Its 0.496:1 lens fills a 30 to 300 inch screen, and Robertson AV can quote multi-room orders.

Key Features

• Brightness: 4,100 lumens
• Resolution: 4K UHD (3840 x 2160)
• Laser light source: 30,000 hours
• Throw ratio: 0.496:1, Fixed short-throw lens lens
• Operation: 24/7
• Connections: 2 x HDMI 2.0, VGA in, 3.5 mm audio out, 2 USB-A 2.0, 3D sync out, RJ-45, RS-232, 12V trigger
• Built-in sound: Mono speaker
• Smart setup: Optoma Smart Control app and four-corner adjustment

Ideal For

• Classrooms: low-maintenance laser
• Meeting rooms: tight installs
• Training rooms: easy setup

Optoma ZK431ST 4,100-Lumen 4K UHD Short-Throw Laser DLP Projector (White) Specifications

Optoma ZK431ST technical specifications, grouped by feature

Specification	Details
Picture & Optics
Resolution	4K UHD (3840 x 2160)
Brightness	4,100 lumens
Contrast Ratio	300,000:1 (2,000,000:1 dynamic)
Throw Ratio	0.496:1
Lens	Fixed short-throw lens
Projection Distance	12.99 – 129.92 in
Keystone Correction	Horizontal and vertical +/-15 degrees
Light Source
Light Source	Laser, 30,000 hours
Power & Environment
Noise Level	29 dB(A)
Power Consumption	125 W eco; 178 W bright; 0.5 W or less standby
Physical
Dimensions (W x D x H)	216 x 274 x 108.5 mm (10.8 x 8.5 x 4.3 in)
Net Weight	2.9 kg (6.3 lb)
Additional Features
Display Technology	DLP
Focal Length	7.51 mm
Screen Size	30 – 300 in
Native Offset	114%
Connections	2 x HDMI 2.0, VGA in, 3.5 mm audio out, 2 USB-A 2.0, 3D sync out, RJ-45, RS-232, 12V trigger
Operating Conditions	0 to 40°C, up to 80% humidity
General
Brand	Optoma
Model	ZK431ST

Specifications are verified against the Optoma manufacturer data sheet (October 2026) and may change without notice. Confirm critical requirements with Optoma before ordering.

What’s in the Box

• AC power cord
• Remote control
• 2 AAA batteries
• Quick start manual

Warranty & Support

Planning a multi-room or multi-site install? Request a quote from Robertson AV for 5 or more units, or call us at 800-919-6548 or email orders@robertsonav.com. Free ground shipping on U.S. orders. Schools, businesses, government agencies and houses of worship: ask us about project and quantity pricing.

Optoma documents the ZK431ST; this listing is the white model ZK431ST.