Nintendo can't get GBA screens fast enough! So, they're getting help from partner in crime Panasonic.
Sharp has been making screen for the Game Boy Color and the Game Boy Advance. Previously, they were hard pressed to meet the demand for the LCDs. Apparently, they have been so hard pressed that Nintendo is now going to be receiving screens from Panasonic as well. Sample screens have already been shipped. By March 31, Nintendo plans to have shipped between 24 and 25 million GBAs. Only about 5% of those units will have Panasonic screens though, which means that Sharp isn't really in any trouble of loosing Nintendo's business.