Ive noticed most gas stations switching to digital signs for priceing. What company makes these signs?

I think the digital sign is the way of the future since most gas stations seem to be switching to them (it avoids having to go outside and switch the little plastic digits with the long pole). I am intrested in investing in the Company that patented this if there is a sole company that makes these. Is there one or is it just a bunch or small companys and the gas stations are just getting them potentially just about anywhere. Ive tried researching them and havent came up with much...if you can help thank you.