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HD31UST1080p ultra short throw home entertainment projector

1080p ultra short throw home entertainment projector

Project a super-sized 100-inch image with the HD31UST placed less than 30cm away from a flat surface* or screen. Feel the action and experience every moment on the big screen for immersive live sports, TV shows, gaming and movies.

Convenient and easy to set up this compact high brightness projector is ideal for well-lit environments so sports fans can enjoy live action with family or friends with the lights on. Boasting Amazing colour technology, it delivers accurate true-to-life colour reproduction for movie lovers. It also has low input latency – perfect for games that rely on rapid reactions.

An integrated speaker provides powerful sound and two HDMI inputs enable connection to multiple devices such as set-top boxes, games consoles and HDMI dongles.

*30cm measured from the back of the projector. Like all Ultra short projectors; to get a perfect image requires a completely flat surface. As most walls are not entirely flat, to avoid slight distortion to the top of the picture, you may need to install a screen onto your projection surface for a perfect image. If this is not possible, we suggest that for non-flat walls you might be better to use a short throw projector which can throw a 100” image from just over 1m”.


Lights on viewing - bright 3400 lumens
Ultra short throw lens - 100" image from less than half a metre away
Enjoy live sports, TV shows, games and movies in Full 1080p
Easy to setup – horizontal and vertical keystone and four corner adjustment

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.

Lights on viewing

This all-round home entertainment projector combines high brightness and vivid colours for vibrant, true-to-life visuals in well-lit environments - ideal for watching TV shows, sports and movies or gaming with family or friends any time of day.

Lights on viewing

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.

Full HD 1080p

Amazing colours

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.

Amazing colours

Full 3D

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.

Full 3D

Dual HDMI inputs

Play games, stream videos and share photos on the big screen in the comfort of your own home. With dual HDMI inputs, you can easily connect to your games console, set-top box, laptop, PC, Blu-ray player or media streamer with a single cable. You can even turn it into a smart projector by connecting an HDMI dongle like the Google Chromecast™, Amazon Fire TV, Apple TV™ or Roku® stick.

USB display

Connect your projector directly to a laptop and display the desktop using a USB cable. No need for a bulky VGA lead.

Four corner correction

Adjust the keystone in both the vertical and horizontal plane. You can 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.

Four corner correction
Integrated speaker

Integrated speaker

A powerful built-in speaker provides exceptional sound quality and an easy setup without the need for costly external speakers.



Use the USB-A port to power an HDMI dongle, such as Google Chromecast.

Auto power 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

Quick resume

This feature allows the projector to be instantly powered on again, if it is accidentally switched off.

Wireless option

Instantly stream Full 1080p and 3D content from a Blu-ray™ player, set-top box, games console or AV receiver to your projector wirelessly; eliminating the hassle and extra cost of installing long cables using the WHD200 (sold separately).


EMEA standard warranty
EMEA standard warranty


Expert reviews

March 2019

The Optoma HD31UST is a good replacement for the TV, right now, if you still want to bring analogue sources to the big screen he belongs to the first choice. Against occasional games the specialist with its short throw projection has nothing to object. If necessary, the integrated speakers are also sufficient.

January 2019

The HD31UST also comes packing 4-corner correction and I think this is a great step in the right direction. It makes uneven walls or awkward placements and setting up a projector in general a complete breeze when you have 4-corner correction built in.

While it may not be totally inconspicuous in the environment , it still manages to fit well into the living room thanks mainly to the sleek modern lines and matt white finish.

In terms of fan noise it definitely is one of the more silent options currently out there on the market coming in at 25dB.

Black levels were decent.

The overall picture quality for an ultra short throw 1080p – it’s rather good.

January 2019

Cinema colour mode provides the most natural colours, and against white wall we found that brightness of -10 and contrast of +2 gave proper shading and highlights. The projector has good ANSI contrast, in that black level and brightness remain in scenes that have both shadows and highlights. The perceived contrast is therefore good.

The advantages of short throw projectors are evident with Optoma HD31UST. Here you get a 60 inch picture close to the wall, and 90 inches only 25 cm away. The picture is drawn with good contrast between black and white, especially in scenes where there is a lot of both, the DLP technology comes into its own. There is a lot of colour here, and although they lack some shades, the projector works well on film and TV. We also like the quiet fan.

December 2018
Optoma's projector can deliver an impressive 3,400 lumens, making it wonderfully bright, and more than capable of bringing out that extra level of visual detail during light-on viewing.

Owner reviews

Verified Review
Optoma HD31UST - Amazing Projector
R Warlow, London : United Kingdom, December 2018.Purchased from Richer Sounds
Been using the projector for 4 hours now and already I am blow away by the projector. Very bright and colours pop. Moving from 3LCD, I was a little doubtful going back to DLP, but so glad I did. DLP has come on leaps and bounds, and this projector just showcases how well it can handle colour, motion and brightness. The projector runs very quietly, especially in Eco mode. Very easy to set up, just plug and play and off you go. Menus are easy to navigate. My room is full of lights and the image is clearly seen. It is obvious that the Rec. 709 is evident here as, mentioned before, colours pop. I have this projector set up with my PC and blu ray. The projector really shines when using the blu ray - very sharp and clear, down to the full HD resolution. I can already see that this projector will be my centre piece for my living room for a long time yet. Amazing job Optoma!


Display technology
1080p Full HD (1920x1080)
3,400 lumens
Contrast ratio
Native aspect ratio
Aspect ratio - compatible
Keystone correction - horizontal
Keystone correction - vertical
Horizontal scan rate
15.375 ~ 91.147Khz
Vertical scan rate
24 ~ 85(120 for 3D)Hz
Screen size
2.03m ~ 2.54m (80" ~ 100") diagonal

Lamp info

Light source type
Lamp watts
Lamp life hours (up to)
4000 (Bright), 12000 (Dynamic), 10000 (Eco), 15000 (Eco+)


Throw ratio
Projection distance (m)
0.45m - 0.56m
Zoom type
Focal length (mm)
Native offset


Inputs 1 x HDMI 1.4a 3D support + MHL, 1 x HDMI 1.4a 3D support, 1 x VGA (YPbPr/RGB), 1 x Composite video, 1 x Audio 3.5mm, 2 x USB-A reader/wireless
Outputs 1 x VGA, 1 x Audio 3.5mm
Control 1 x RS232, 1 x RJ45


Noise level (typical)
PC compatibility
2D compatibility
NTSC M/J, 3.58MHz, 4.43MHz PAL B/D/G/H/I/M/N, 4,43MHz SECAM B/D/G/K/K1/L, 4.25/4.4MHz 480i/p, 576i/p, 720p(50/60Hz), 1080i(50/60Hz), 1080p(50/60Hz)
3D compatibility
Side-by-Side:1080i50 / 60, 720p50 / 60 Frame-pack: 1080p24, 720p50 / 60 Over-Under: 1080p24, 720p50 / 60
Full 3D
Security bar, Kensington Lock, Password protected interface
OSD / display languages
25 languages: Arabic, Czech, Danish, Dutch, English, Farsi, Finnish, French, German, Greek, Hungarian, Indonesian, Italian, Japanese, Norwegian, Polish, Portuguese, Romanian, Russian, Chinese (simplified), Spanish, Swedish, Chinese (traditional), Turkish, Vietnamese
Operating conditions
5°C ~ 40°C, Max. Humidity 85%, Max. Altitude 3000m
Remote control
Data remote with laser and mouse function
Speaker count
Watts per speaker
In the box
AC power cord
Remote control
2x AAA batteries
Basic user manual
Optional wireless models


LAN - control
LAN - display


Power supply
100 ~ 240V, 50 ~ 60Hz
Power consumption (standby)
Power consumption (min)
Power consumption (max)

Weight and dimensions

Net weight
Dimensions (W x D x H) mm
343 x 383 x 112
Verified owner

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