Voice Assistant-Compatible 4K UHD Projector


  • Works with Amazon Alexa and Google Assistant
  • 4K UHD, bright 2,400 lumens and RGBRGB color wheel
  • HDR10 support for brighter whites, deeper black levels and vivid colors
  • 4K video playback with the integrated USB media player
  • Dynamic Black delivers 500,000:1 contrast ratio for exceptional black levels
  • HDMI 2.0 with HDCP 2.2 connectivity ensures compatibility with 4K UHD video sources
  • Vertical lens shift and 1.3x zoom for easy installation.
A smart projector for a smart home

Take control of your home theater with voice commands. With the Alexa smart home and custom skills or Google Actions, control your 4K UHD 2,400 lumen Optoma UHD51A projector with intuitive voice control and easy integration using Amazon Echo and Google Home devices.

Use voice commands to power the projector on and off, change volume, change input source and control the USB media player. Additionally, the UHD51A utilizes the latest Texas Instruments 4K UHD DLP chipset capable of displaying 8.3-million simultaneous distinct pixels at screen sizes 140 inches and higher.

A pair of HDMI 2.0 inputs with HDCP 2.2 support, HDR compatibility and wide color gamut ensure 4K device compatibility, rich lifelike color and contrast for immersive experiences. A 1.3x optical zoom and 15% vertical lens shift provide installation flexibility.

Available for purchase at these online retailers:

Alexa Smart Home and Custom Skills

Alexa smart home and custom skills enable projector control via Amazon Alexa. Supported control functions include power on/off, volume level, input selection, USB media player playback and image mode changes.

Google Assistant Compatible

Google Voice Action compatibility provides projector control via Google Assistant. Supported control functions include power on/off, volume level, input selection, USB media player playback and more.

DLP Technology®

DLP® (Digital Light Processing) is a proprietary technology from Texas Instruments™ that offers digital projection with higher contrast, faster response time, good pixel structure and virtually no color degradation.

Full 3D

Display true 3D content from almost any 3D source, including 3D Blu-ray Disc™ players, 3D broadcasting, and the latest-generation game consoles. Support for 144Hz rapid-refresh rate provides ultra-smooth flicker-free images. 3D content can be viewed with DLP Link active shutter 3D glasses when projector is used with a compatible 3D player. DLP link 3D glasses sold separately.

Dynamic Black Technology

This feature gives more depth to your image by smoothly adjusting the lamp output to create a stunning high contrast ratio. Bright scenes appear crisp and clear, while dark scenes remain detailed with deep blacks and exceptional light and shade detail.


Using sophisticated frame-interpolation technology, advanced motion control processing eliminates motion blurring or image judder, even in high-speed action sequences. PureMotion works in 2D and is optimized for 1080p24.


This technology ensures all the information contained in an image is accurately reproduced on the screen to give a stunning crystal clear, pin-sharp picture. Complex algorithms detect each frame and improve image sharpness before the frame is projected.


This mode allows the projector to reproduce more detailed shades of color for vibrant, natural-looking images. Colors are more saturated and more accurate.

Vertical Lens Shift

Vertical lens shift simplifies installations by shifting the image up and down without image distortion to provide a wider range of projector placement possibilities, making it easier to position the projector in a room.


High dynamic range (HDR) technology delivers brighter whites and deeper black levels. Optoma HDR accepts HDR10 signals with four selectable picture modes: Normal, Bright, Detail, and Film.


Color the way it is meant to be seen – rich, colorful and cinematic pictures and games via DCI-P3 wide color gamut coverage.


HDR signals are mapped using REC.2020 tone mapping and provides coverage for REC.709, DCI-P3 and a wide coverage color gamut.

PC-Free USB 4K UHD HDR Media Player

Integrated 4K UHD HDR USB Media Player provides playback of 1080p and 4K UHD HDR video, audio files and images along with support for Office Documents and PDF Files.

Additional information

Aspect Ratio16:9 (native), 4:3 and LBX compatible
Audio2x 5 Watt Speakers
Brightness2,400 ANSI lumens
Color WheelRGBRGB 6 segment color wheel
Connections2xHDMI 2.0 (w/ HDCP 2.2, MHL 2.1), VGA-in, audio-in (3.5mm), audio-out, S/PDIF out (optical), x4 USB 2.0, RJ-45, RS-232C, 12V trigger
Contrast RatioUp to 500,000:1 with Dynamic Black
Display TechnologySingle 0.47” 4K UHD DMD DLP® by Texas Instruments™
Image Size34.1” – 302.4 (34.1” to 140” optimal image size)
Light Source Life4,000/10,000/15,000 (Bright/ECO/Dynamic)
Lens ShiftVertical: +10%
Maximum Resolution4K (4096 x 2160) @ 30Hz
Native Resolution4K UHD (3840 x 2160) @ 60Hz with XPR Technology
Noise Level28/25dB (Bright/ECO)
Offset100% (see Lens Shift)
Operating Temperature41–104°F (5–40°C), 85% max humidity
Power Consumption317W typical (Bright mode), 348W max (Bright mode), 259W typical (Eco+ mode), 285W max (Eco+ mode)
Power SupplyAC input 100–240V, 50–60Hz, auto-switching
Projection Distance2.9’ – 34.89’
Projection LensF=2.5 – 3.26, F=20.91 – 32.62 mm manual focus
Projection MethodFront, rear, ceiling mount, table top
Remote ControlFull Function Home Remote Control
Throw Ratio1.21 – 1.59 (distance/width) ±5% variance
Zoom Type1.3x Manual, 0.8 – 2.0 Digital
3D CompatibilitySide-by-Side: 1080i50 / 60, 720p50 / 60, Frame-pack: 1080p24, 720p50 / 60, Over-Under: 1080p24, 720p50 / 60
Computer Compatibility4K UHD 2160p, WUXGA, HDTV 1080p, UXGA, SXGA, WXGA+, WXGA (1366×768), WXGA, HDTV (720p), XGA, SVGA, VGA, PC and Mac compatible
Video Compatiblity4K UHD 2160p (24/50/60Hz), 1080p (24/50/60Hz), 1080i (50/60Hz), 720p (50/60Hz), 480i/p, 576i/p
Dimensions15.4” x 11.1” x 5.1”
SecurityKensington® lock port, password (OSD)
Weight11.75 lbs
Optional AccessoriesMount, wireless USB adapter (for wireless screen mirroring or Alexa Wi-Fi replacement)
UPC796435 81 308 6
Warranty Info1-Year parts and labor limited warranty on the projector, 90 days lamp warranty
  • UHD51A Datasheet

  • UHD51ALV-Front_flare_100dpi

  • UHD51A-quarter_flare_300dpi_awards

  • UHD51ALV_4_300dpi

  • UHD51ALV_3_300dpi

  • UHD51ALV_1_300dpi

  • UHD51ALV_2_300dpi

  • UHD51ALV_5_300dpi

  • UHD51ALV_environment

  • UHD501ALV 300DPI

  • UHD501ALV_Scenario-_300dpi

  • UHD51ALV User Manual

  • UHD51ALV Quick Start Guide

  • UHD51ALV Quick Start Addendum

  • UHD51ALV Smart Home for Smart Projection Command List

  • 180411 SmartProjection iphone All

  • UHD51ALV Alexa User's Guide

  • UHD51ALV Google Home Assistant Optoma SmartProjection Command List 20180620

  • UHD51A C06 System Firmware_C09 LAN Firmware Release Notes

  • LAN FW C09 Upgrade Wireless iOS Android Windows OSX Instructions

  • UHD51A C09 LAN Firmware

  • UHD51A C06 OTA Guide

  • UHD51A C06 Firmware Upgrade

  • UHD51A UHD51ALV UHL55 Google Home PC Setup Guide With Commands 10242019

  • UHD51A UHD51ALV UHD52ALV UHL55 Alexa Setup PC Guide - 20191024

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