Please help. I am newbie of Arduino Duemilanove Board. I am not able to display character on LCD D1621 by SANYO.
I don't have any information on that particular display but from it's part number I suspect that it is a 16x2 character mode LCD driven by a Sanyo version of the HD44780, possibly an LC7985. If that is the case then the LiquidCrystal library is what you need to use it. I suggest that you follow the tutorial at http://www.ladyada.net/learn/lcd/charlcd.html to get it running.
(Your thread was locked for a day or so which is why you haven't received any responses until now.)