Providing on screen lyrics for songs or scripture reference verses for messages is a vital component to any modern church service. It goes without saying that many people don't know the words to the songs that are sung and many do not bring a Bible or some type of digital device that may have a Bible app on it with them.
During the praise and worship time of a service, you'll find that most people will tend to participate more when they are confident of what the next word they are supposed to sing is. Providing large readable lyrics on screen is a critical part of our tech ministry.
Sermon notes are provided to support the points being made during the message and are reinforced even further by projecting them on screen. This is just another way for use to drive home the message that is being delivered in any given service.