I don't mean LEDs for indication, debugging, etc. I mean LED effects like on the MSI Z370 Motherboard, where entire sections of the board are illuminated by continuous strips of light. How is this accomplished?
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Usually this is done with a small side-firing LED that shines into a light guide film to distribute the light. Sometimes they etch small features so the light comes out at only certain places.
Here is an example of similar technology (LINK) : The circuit carrier film can be a PCB.
EDIT: Fun coincidence: I was assembling a new embedded system this morning, and on power-up noticed the motherboard has this same feature:
It is a Gigabyte GA-H270N-WIFI.