Build Resolution Requirements for webOS OTT React App

Web App Development
1

Hello everyone,

I’m working on an OTT application using React for LG webOS and have a question about supported screen resolutions:

  • I’ve configured appinfo.json with a resolution of 1920×1080.
  • When I install this build on FHD (1920×1080), UHD (3840×2160), and HD (1280×720) TVs, the app always renders at 1920×1080 and scales accordingly—UI elements remain consistent across devices.
  • If I change the appinfo.json resolution to 1280×720, the app renders at that size instead.

My question is: For final submission to the Seller Lounge, do I need to provide two separate builds—one targeting 1920×1080 and another for 1280×720—or is a single 1920×1080 build sufficient to cover all supported TV resolutions?

2

Please refer to Supported App Resolution. Thank you.

3

In the TV forum they mentioned like we need to submit two ipk files and am in some other doubts also

  1. Do I need separate Figma (or other design) files for both 1920×1080 (Full HD) and 1280×720 (HD), or can I maintain a single design source and rely on responsive styling?
  2. If I stick to one codebase, what’s the best way to implement dynamic styling so that UI components—fonts, icons, spacing, etc.—scale correctly at both 1080p and 720p?
  3. I understand that LG Seller Lounge requires separate .ipk packages for each resolution. When I submit the 1280×720 build, I notice the visual quality isn’t as sharp as the 1920×1080 version. Is this drop in quality due to the TV’s internal scaling behavior, or is there something in my styling/assets that I need to adjust?
4

The purpose of the resolution property in the appinfo.json is to tell the TV the resolution of your app. If the resolution property is set to 1280x720, it should be a 1280x720 app, and if it is set to 1920x1080, it should be a 1920x1080 app. All FHD TV models support 1280x720 apps, and most UHD TV models support 1280x720 and 1920x1080 apps. However, some UHD TVs have lower specs than others, so only 1280x720 apps are distributed. If you use width: 100% and height: 100% in your app, it will not display correctly on these UHD TVs. To distribute your app without resolution issues, please submit two packages: 1280x720 and 1920x1080. And use width: 1280px and height: 720px and width: 1920px and height: 1080px in your app HTML container. Thank you.