Career Technology declined to confirm whether it intends to sell its factory to rival
FPCB manufacturer Zhen Ding Technology, as has been rumored.
The FPCB is for the iPhone X's wide-angle rear camera lens.
Now, Kuo says that the main bottleneck in Apple's iPhone X production is the flexible printed circuit boards (FPCBs).
Possible hurdles include testing of the dies before embedding (Known-Good-Die problem), necessary precise placement of the bare die and the need for a very fine pitch PCB or FPCB, compatible with the pad pitch of the embedded chip.
UTCP packages are aligned and fixed (by heat tack) on a patterned inner layer of the multilayer substrate, and connection between package and wiring of the PCB or FPCB is achieved by through-hole interconnects.
For this reason, the UTCP technology for embedding active circuitry into an FPCB is ideally suited for these systems.
"This is because
FPCB is replaced with film, which is more sensitive to temperature change of the 3D touch sensor in OLED iPhone.