5V WS2812B USB LED Strip light 5050 RGB Dream Color Ambient TV Kit for Desktop PC Screen Background lighting 1M 2M 3M 4M 5M
The analog TV signal is not processed by the Android OS level, so the backlight application will not work with regular TV channels. The backlight works only with Android OS applications that do not use protected content. 4K performance depends only on your hardware.
Unfortunately, programs such as YouTube and Netflix use protected content (DRM), AAA application has no ability to work with them. In order to make it work you should use the special client. For example SmartYoutube.