Sapphire substrate applications have shifted from LED to smartphones, according to a report by Taiwanese media UDN. Apple was the first to apply the material in its iPhone home button, and has recently expanded sapphire substrate applications to fingerprint recognition sensors, camera outer case, and even the entire smartphone monitor. As a result, Taiwanese manufacturers are close to full production capacity. ACME Electronics Corp. subsidiaries including USI Optronics Corp., Crystal Applied Technology Inc., ProCrystal Technology Co., and Crystalwise Technology Inc. have launched a new wave of expansion.