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Optoma ZK431ST: Compact 4K UHD 4,100 Lumen Short Throw Laser Business and Education Projector
The Optoma ZK431ST makes True 4K UHD short throw projection accessible for budget-conscious education and corporate buyers. At 4,100 lumens, the ZK431ST delivers bright, vivid visuals in classrooms and conference rooms with moderate ambient light. DuraCore laser technology provides up to 30,000 hours of maintenance-free operation, eliminating the cost and disruption of lamp replacements. Four-corner correction, keystone adjustment, 360° projection capability, and Optoma Smart App compatibility make installation and alignment straightforward.
Crisp 4K from wall to wall: Native 4K UHD (3840×2160) makes text, data, and imagery sharp and readable across screen sizes up to 300"
Project big from tight spaces: 0.496:1 short throw lens fills the screen from just 1.3 feet away—no more crowded rooms or presenter shadows
Bright enough for real classrooms: 4,100 lumens keep images clear and vibrant in rooms with controlled to moderate ambient light
No lamps. No maintenance. 30,000 hours: DuraCore laser technology means zero replacement costs and no unexpected downtime
Install anywhere: Four-corner correction, ±15° keystone adjustment, and 360° projection flexibility handle virtually any room layout
Smart setup from your phone: The Optoma Smart Control App guides screen alignment and gives full projector control from a mobile device
Optoma’s new generation of lamp-free laser projectors is designed to deliver exceptional visual quality, simplified setup and control, and long-term value across business, education, or simulation environments.
Over-the-air Update
Compact Size
Low Maintenance
Eco-Friendly DuraCore Laser
High Brightness for Ambient Light
Optoma Smart Control
Optoma Management Suite
Short Throw
Long Lifespan
Clear, Shadow-Free Projection for Ambient Light Environments
With 3,900 lumens of high brightness, this projector delivers Full HD visuals even in ambient light. Its short-throw design reduces shadows even in limited spaces, making it ideal for meetings, classrooms, and commercial environments.
Exceptional 4K viewing experience
The projectors deliver up to 8.3 million pixels with 4K UHD (3,840 × 2,160) resolution, providing exceptionally sharp images that make even small text and detailed graphs clear and easy to read.
Reliable for Long-Term Use with DuraCore Laser
Optoma DuraCore Laser technology delivers consistent brightness, vivid colors, and up to 30,000 hours of lamp-free operation. With instant on/off functionality, reduced power consumption, and no lamp replacements, it offers a lower total cost of ownership and long-term, reliable performance—ideal for business and education environments.
Tailored Display Modes for Business and Education
Tailored display modes for business and education. Optoma projectors deliver long-lasting image precision with DLP technology, ensuring accurate, vibrant colors that bring every detail to life.
Smart Control at Your Fingertips
Optoma Smart Control app streamlines device management and intelligently adjusts screen alignment across Optoma displays, all from your mobile device. From setup to daily operation, it acts as an intelligent remote, enabling control of key functions such as power on/off, input source switching, status alerts, and more, helping users save time and deliver a better viewing experience in any space.
*Supports both iOS and Android OS.
*The product shown in the image below is for illustration purposes only.
Smart Screen Alignment for Quick Installation
Instant auto-alignment with Smart Fit
Smart Fit uses your smartphone’s camera to detect the screen frame and automatically correct the image alignment, significantly reducing installation effort.
Smart Move keeps your screen uninterrupted
Smart Move automatically detects obstacles using the camera and seamlessly repositions the projection to a clear, unobstructed area, ensuring continuous visibility.
H/V Keystone correction
Keystone correction adjusts trapezoid-shaped images caused by angled projection. An intuitive slide dial enables quick and smooth adjustment of vertical and horizontal alignment.
Four-corner adjustment
Correct image distortion effortlessly with four-corner adjustment. Just tap and drag any corner to reshape the frame in real time.
Manage, Monitor, and Diagnose—All from One Place
Optoma Management Suite (OMS™) is an intuitive (cloud-based or via local networking) display management solution, designed to streamline operations by monitoring, diagnosing and controlling audio visual displays from anywhere via a single plarform. With an easy-to-use interface and 24/7 real-time monitoring, OMS enables users to check the status of display devices and make configurations to optimise performance.
Always Stay Updated
This product supports over-the-air (OTA) firmware updates, keeping your projector up to date without the need for USB drives. Updates are delivered automatically, and users simply click Download to install them. Updates may include new features, performance enhancements, and security improvements. This helps reduce IT workload and ensures reliable operation.
Flexible Setup for Any Spaces
With ±30° keystone correction, and support for 360-degree or portrait mode projection, this projector offers flexible installation in any space.
H/V keystone correction
Four-corner adjustment
Designed for Sustainability
Aligned with Optoma’s Green Promise, this projector features an energy-efficient, mercury-free DuraCore laser light source. Built with over 50% recycled metal and PCR materials and packaged in 100% recyclable packaging, it is designed to reduce material waste and power consumption in support of sustainability.
Eco-friendly packaging
Eco-friendly packaging produced with FSC-certified paper and made with recycled and reusable materials.
Sustainable materials
Use of environmentally, friendly materials for products chassis and during production
Max Temperature(operating): 0 ~ 40°C; Tolerance +/- 2°C,
Max Altitude(operating): 10,000 ft., for 0°C~30°C,
Max humidity(operating): 80% RH, non-condensing
Remote control
Business remote control
Speaker count & Watts per speaker
1 x 15W
Input lag
4K/ 60Hz: 16.7 ms
1080P/ 60Hz: 16.7 ms
1080P/ 120Hz: 8.6 ms
In the box
AC power cord
Remote control
2 x AAA batteries
Quick start user manual
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