display panel vs display board

display panel and display board both are nouns.

Word	Noun	Adjective	Verb	Adverb
display panel	Yes	No	No	No
display board	Yes	No	No	No

As nouns, display panel and display board are synonyms defined as:

display panel and display board: a vertical surface on which information can be displayed to public view

Other synonyms of display panel include board.

display panel (noun)	display board (noun)
a vertical surface on which information can be displayed to public view	a vertical surface on which information can be displayed to public view