Combo Value and Label in Grid when data Load


I have a grid cell with combo type
it relates to my DB field “CONTENT_VALUE”

I would like to show Content Display Name when Load data to Grid.
The Content Display Name is kept in another definition table.

how to achieve for the grid keeping “CONTENT_VALUE” but
show Content display name in that field (with Combo type)?
At last, I have to save the “CONTENT_VALUE” to DB.