Sony owns Blu Ray tech but not DVD. DVD was industry consortium to prevent a repeat of the VHS and betamax war. Only lasted a generation unfortunately.
I think most people are on laptops now. Blows my mind but yeah.
My comparison is that screen size is like desk size. A laptop being those tiny pull out side desks at college, and a monitor being a desk. I was massively downvoted for that. People like their small screens.