The Optoma HD31UST is a dedicated ultra short throw (0.25:1 lens) optimised for home use. Native widescreen high definition 1080p resolution (1920 x 1080 pixels, 16:9 aspect ratio), experience a super-sized 100-inch diagonal image with this ultra short throw projector placed just 30cm away from a wall or screen.
An integrated speaker provides great sound and two HDMI inputs enables an easy setup. You can even turn it into a smart projector by connecting a HDMI dongle like the Google Chromecast, Amazon Fire Stick or Apple TV to play games, stream videos and share photos on the big screen in the comfort of your own home.
To make sure this projector is the right fit for you room
1080p ultra short throw home entertainment projector
Experience a super-sized 100-inch image with this ultra short throw projector placed just 30cm away from a wall or screen. Perfect for live sports, TV shows, films and gaming with it's bright, razor sharp images with optimum colour performance even with the lights on.
Ultra Short Throw
With an ultra-short throw lens, you can project an impressive image greater than 100” from less than a metre away. This allows you to place the projector closer to the wall, reducing shadows so you can present with ease; perfect for interactive applications.
Full HD 1080p
1080p resolution gives you sharp and detailed images from HD content without downscaling or compression; perfect for watching Blu-ray movies, HD broadcasting and playing video games.
Watch your movies, TV shows and play games with stunning colours in any environment. Optoma projectors provide reliable performance suitable for any content and environment. Our home projectors are capable of reproducing the Rec.709 colour gamut, the international HDTV standard to guarantee accurate reproduction of cinematic colour exactly as the director intended. Or more saturated colours for a punchy looking image, great for gaming and animated movies.
Connect your projector directly to a laptop and display the desktop using a USB cable. No need for a bulky VGA lead.
Featuring a wide range of options you can control and monitor the projector remotely.
• RS232 Optoma projector’s come with an extensive set of RS232 commands making it simple and easy to manage using any control system.
• AMX Compatibility Dynamic discovery protocol is incorporated into the projector allowing for easy installation with AMX control systems.
• LAN Control Using the compatible RoomView® software you can power on/off, monitor, manage and control up to 250 projectors at the same time from any computer.
• Schedule the projectors to power on/off.
• Control and alter the projector settings using the simple web browser.
• Emergency text broadcast capabilities for urgent or important announcements.
• Automatically receive email updates for lamp maintenance.
HV keystone and four corner adjustment
Adjust the keystone in both the vertical and horizontal plane or individually warp each corner of the image to create a perfectly square image. Ideal for uneven walls or where projector placement is awkward and needs to be installed at an angle.
A powerful built-in speaker provides exceptional sound quality and an easy setup without the need for costly external speakers.
Optoma projectors can display true 3D content from almost any 3D source, including 3D Blu-ray players, 3D broadcasting and the latest generation games consoles.
Use the USB-A port to power an HDMI dongle, such as Google Chromecast.
This feature allows the projector to be instantly powered on again, if it is accidentally switched off.
Auto power off
There may be instances when the projector is left running when not in use. To help save energy, the "auto power off" feature automatically turns off the projector after a set period of time if it is not being used.
USB for display and control
USB Type A for power
USB for PC Less Presentation
RJ45 For Control/Monitoring
RS232 For Control
Dimensions (W x H x D) in cm
34.3 x 11.2 x 38.3
Fan Noise (db)
Fan Noise in Eco Mode (db)
Audio Output (Watts)
Lamp Life (Hours)
Lamp Life Eco Mode (Hours)