I want to know LC1641 display is compatible with arduino. This is a 16x4 display
i tried the hello world example but it did not work 
thanks
Any character mode display should be compatible with the Arduino and with every other microcontroller in existence as well.
The LiquidCrystal library should display the 'hello world' tutorial example program correctly.
You will run into some minor problems with cursor positioning on the bottom two rows since the library does not handle that aspect properly.
Don