IGZO panels first were used in the iPad Air. The burn-ins are not meeting Apple technological standards, and the IGZO panel is also facing problems in supply:
The burn-in problem was caused by the drastic reduction of the pixel size. The resolution of the 7.9-inch iPad mini with Retina display is 2048×1536, about four times clearer than the existing 1024×768 products. LG Display used the amorphous silicon (a-Si) for the substrate, whereas Sharp used IGZO.
The pixel of the smartphone display is smaller than that of the iPad mini Retina panel, but as the Low Temperature Polycrystalline Silicon (LTPS) technology is used, it can be produced stably. The pixel of the iPad mini Retina is the smallest among those products using a-Si. Sharp failed to solve the chronic problem of IGZO, i.e. uniformity, and its yield went down.
This has led Apple to make negotiations with Samsung Display for supplies from 2014. Apple needs 15 million panels from Sharp and LG Display, at a 40 to 60 percent ratio. Samsung was also supposed to be the original supplier, but things didn’t turn out well.
