Yeah, you look fine with those numbers. Display SHOULD use the most power, but 31% for the OS means you have some background applications or widgets or sync processes running. It's no big deal, especially considering your battery's performance as indicated by the uptime since last charge. Also, you can tap the area at the top with the graph to get more detailed information, and can do so for the individual items below likewise. That can help you to understand what's using what. WIFI, Bluetooth and other services will contribute to Android OS usage.
"Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
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