In a note to clients — as noted by MacRumors — KGI Securities analyst Ming-Chi Kuo says the “iPhone 8” will adopt a higher-cost stacked logic board design to support longer battery life.
“As battery material tech isn’t likely to see major breakthroughs in the next 3-5 years, mainboard area can only be reduced via stacked SLP, which makes space for larger battery and extended usage time,” he writes. “Thanks to stacked SLP, we expect the OLED iPhone to have similar dimensions to a 4.7” TFT-LCD iPhone, and have comparable battery capacity (equipped with around 2,700 mAh L-shaped 2-cell battery pack) to a 5.5” TFT-LCD iPhone. The battery life of the OLED iPhone could be better than that of the 5.5” TFT-LCD model as OLED panels are more energy-efficient than their TFT-LCD counterparts.”
Kuo added that the battery life of the next gen iPhone with an OLED display could be better than that of a 5.5-inch model with a traditional LCD display since OLED panels are more energy-efficient than their TFT-LCD counterparts.