According to a story on 9to5 Mac, as fantastic as the newest iPadâ€™s Retina display is, it was actually Appleâ€™s second choice for the third-generation iPadâ€™s screen. Display boffin and president of DisplayMate Technologies, Raymond Soneira, told CNET that the newest iPad actually represents â€œPlan Bâ€ for Apple, as Apple had originally wanted a lighter and thinner type of display for its latest iPad. According to Soneira, Apple really wanted to use Sharpâ€™s IGZO technology in the new iPad, which would have given it the quality it wanted in a thinner display, but in the end had to settle for the older amorphous silicon technology, which is powered by a bigger battery. This could explain why the newest iPad is a little heavier and thicker than the iPad 2. Apple was apparently unable to use Sharpâ€™s IGZO tech in the current version of the iPad because it simply was not quite ready yet.
Source: Expert: Apple settled for older display tech in new iPad, Sharp’s IGZO tech wasn’t ready | 9to5Mac | Apple Intelligence