Remotely Controllable LCD for Office Do Not Disturb/On Call Sign?

i'm bit geeky , trying make remotely controllable lcd outside office change on fly when i'm on call, in meeting, not disturb. feasible arduino newbie (haven't touch yet consider if possible)? requirements:

- controllable via usb, bluetooth, or wifi
- max size of 4" x 6" lcd (i saw earthlcd, don't know enough arduino)
- distance desk outside door 15'
- messages updating via pc/mac or mobile device
- need able switch messages on fly

thanks...

a buddy suggested should consider raspberry pi since outputs video , little computer more of i'm trying do. feedback, appreciated.

thanks...

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