I've tested the circuit. Good news is the 10 volt boost circuit work pretty well, all electrical characters met what I wanted. Sadly the bad news is the connector seems to be happy with faced down FPC. which it's means that I need to use the connector in reversed connection. Thus the display will now facing down. To reverse this, I need to put the FPC on another side of PCB, so the display can face up toward us but face down relative to the connector. Another PCB rev, Another PCB batch. Another 2 months 😥