LCD daytime visibility

I've got a red sparkfun serial lcd and I'd like to be able to see things more clearly in daylight. Should I add a filter or perhaps more backlighting? Does anyone have any resources on this?

(PS i'm aware that this isn't exactly the right category for this post but its the closest)

You can adjust the contrast and see which setting gives you better daylight readability.

I havent tried mine in broad daylight but they are perfectly visible indoors.

Are you using a backlit lcd?