To properly experience our website, you will need to use an alternate browser or upgrade to a newer version of internet Explorer (IE9 or greater).

The website utilizes responsive design to provide convenient experience that conforms to your devices screen size. In order to get the best possible experience our LG.COM website please follow below instructions.

If you’re using Internet Explorer 8 or earlier, you will need to use an alternate browser such as Firefox or Chrome or upgrade to a newer version of internet Explorer (IE9 or greater).

If you’re using Internet Explorer 9 and higher, turn off your Internet Explorer browser’s “Compatibility View settings” by following steps below:

  • Right click at the top of your browser and make sure the “Menu Bar” option is selected
  • Select “Tools” from the menu bar and then select “Compatibility View settings”
  • In the pop-up menu uncheck all three boxes and click “Close”
  • Your browser window will automatically refresh and you’ll be ready to go
Skip to Contents Skip to Accessibility Help


Key Features

  • 34" 21:9 Curved WQHD IPS Display
  • USB Type-C™ & USB 3.0 Quick Charge Ports
  • Height Adjustable Stand
  • AMD FreeSync
  • On-Screen Control with Screen Split
See Retailer for Pricing
34 Inch Curved UltraWide® Display

34 Inch Curved UltraWide® Display

The 3440 X 1440 curved UltraWide QHD IPS display offers amazingly sharp picture quality. Its pixel area is about 1.8 times larger than a Full HD 21:9 monitor, and about 2.4 times larger than a Full HD 16:9 monitor. This UltraWide is ideal for photographers, producers and other creative professionals who need more room for big ideas.

IPS Display

IPS Display

IPS (In-Plane Switching) technology highlights the performance of liquid crystal displays. Response times are shortened, color reproduction is improved, and users can now view the screen at virtually any angle.

USB Type-C™

USB Type-C™

Offering a new generation of convenience, USB Type-C™ ports allow 4K video display, data transfer and laptop/mobile device charging, all at the same time over a single cable. Reduce cord clutter and increase efficiency with USB Type-C™.

USB 3.0 Quick Charge

USB 3.0 Quick Charge

Save time when you power up the battery of a connected device using USB 3.0 Quick Charge. Once enabled, this convenient feature allows a phone or other mobile device to charge up to four times faster than regular USB 3.0.

Screen Split 2.0

Screen Split 2.0

Customize your monitor layout for multitasking with the latest version of LG Screen Split. Resize and display multiple windows at once, with 14 options including four different picture-in-picture (PIP) choices.

38UC99-W FreeSync


With FreeSync™  gamers can experience seamless, fluid movement throughout hi-res, fast-paced games. FreeSync™ nearly eliminates tearing and stuttering that can occur because of differences between a graphic card’s frame rate and a monitor’s refresh rate.

Advanced Gaming Features

Advanced Gaming Features

Serious gaming features for serious gamers. Black Stabilizer reveals superior detail in dark scenes, and Dynamic Action Sync assures smooth, clear game play.

Reader Mode

Reader Mode

Reducing blue light to help lessen eye fatigue, Reader Mode provides optimal conditions for reading. With just a click of a mouse, you can more comfortably read your display.


What People Are Saying

  • bvseo_sdk, java_sdk, bvseo-
  • CLOUD, getReviews, 4ms
  • bvseo-msg: The resource to the URL or file is currently unavailable.;


Ask your questions. Share your answers.
Please first review the detailed product information and help guides in the Product Support section for this product prior to posting a question.

What is the USB-C type and speed ? Type 3.1 (10Gbps) or type 3.0 (5Gbps) ? Thank you in advance

Asked by: mcbreaker
The underlying technology for the USB Type-C™ port on the LG 34" Class 21:9 UltraWide® WQHD IPS Curved LED Monitor with USB Type-C (34" Diagonal), Model # 34UC99-W is USB 3.0...^IFV
Answered by: LGJoel
Date published: 2018-04-06

How is it possible for this monitor to be lighter with a stand than it is without?

Asked by: Meuryc
Hi Meuryc. Thank you for pointing out the error. The weights specifications for this LG 34" Class 21:9 UltraWide® WQHD IPS Curved LED Monitor with USB Type-C (34" Diagonal), Model # 34UC99-W were inadvertently flipped and should be listed as: Without Stand Weight 14.1 lbs With Stand Weight 18.5 lbs...^IFV
Answered by: LGJoel
Date published: 2018-03-22

Can I display a Mac & a Windows computer in split screen at the same time?

Asked by: mjh2018
The PBP (Picture by Picture) mode in the LG 34" Class 21:9 UltraWide® WQHD IPS Curved LED Monitor with USB Type-C (34" Diagonal), Model # 34UC99-W allows you to display images from two input modes simultaneously on the monitor and the Main/Sub Screen Change mode allows you to toggle between the main screen and the sub screen in PBP mode and the Main /Sub Sound Change mode allows you to toggle between the audio of the main screen and sub screen in PBP mode...^IFV
Answered by: LGJoel
Date published: 2018-01-16

is this mac book pro compatible?

Asked by: theletterf
For this unit DisplayPort 1.2 may not be supported depending upon the Mac product. ^AC
Answered by: amber
Date published: 2018-05-05

Does the 34UC99-W have built-in speakers? (can't find it on the LG spec sheet; although other sites mention it)

Asked by: Nadal2018
The LG 34" Class 21:9 UltraWide® WQHD IPS Curved LED Monitor with USB Type-C (34" Diagonal), Model # 34UC99-W does not have built-in speakers. It has a headphone jack in the back that you can connect passive or active desktop speakers to and has a volume control and MaxxAudio® by Waves, which is a suite of studio-quality tools that you can use to enhance the Bass, Tremble, and Dialog (MaxxBass, MaxxTremble, MaxxDialog) settings and a Midnight Mode that lets you enjoy rich and full sound at a low volume...^IFV
Answered by: LGJoel
Date published: 2018-06-17

Any idea when the LM340UW3 (34" 1440p 144hz IPS, 1800R curve) display will be out in Australia? I've read August / Sept 17 but so close and still so little news on it.

Asked by: Ozbloke36
Australia is responsible for its own product releases and product availability and our offices in the U.S. will not have information for product releases or product availability in Australia. For inquiries with regards to when the LG LM340UW3 monitor will be released in Australia, please contact the LG Support Center in Australia...^IFV
Answered by: LGJoel
Date published: 2018-06-05

Can this charge a 15inch macbook pro?

Asked by: jetty
Our offices, in the United States, do not have product information for Australia. In order to obtain such information, it is recommended to check our subsidiary’s website, at
Answered by: NeilE
Date published: 2018-05-24

Why is it that I can't find any reviews, youtube videos or really no mention of this exact monitor online? Only thing that ever pops up is the 38UC99 instead of this 34"

Asked by: Arjen
LGJoel: Thanks for answering. I had already seen that YouTube video. It's a slideshow of images and text I can find right here on this website. You can't really call that a review. Why are there no Youtubers who did any reviews on this? And a monitor that was released in April this year is also not 'recently'. I'm thinking of buying this but the lack of good / any reviews is stopping me right now.
Answered by: Arjen
Date published: 2017-08-09
  • y_2018, m_7, d_17, h_24CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.8
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_15
  • loc_en_US, sid_MD05812249, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_lg
  • bvseo_sdk, java_sdk, bvseo-
  • CLOUD, getContent, 4ms