You don't want 220VAC directly feeding this circuit. The resistor needed would be large and defeat the purpose. I agree with SABorn suggesting the transformer for safety's sake. My 1988-model name-in-lights boards used a wallpack for a PSU, the first letter was in caps, and the display blinked. I haven't kept in touch with the recipients, so I don't know how many are still around to this day.
Have you considered solar-powered, rechargeable batteries for a PSU?