Three onsite interviews spread across a month and one take-home test. They don't have the decency to say whether I got the position or not; they completely ghosted me (I would have declined anyways). I couldn't have done that badly if they kept having me come in and talk with their employees.

Questions were very technical but manageable with diligent studying. Just make sure to study pixel circuit design, a quite esoteric subject for an interview.

One of the interviewers was lamenting about how her one year on the job felt too long and how all her colleagues she started out with had left. Not exactly appealing for a prospective employee...

The hiring manager was constantly saying, "You have to be young for this job." Additionally, the HR lady asked if I was okay spending a third of my time in Asia and indirectly prodded me to see if I had children. I could see this job would not be advised for those with families.

Draw circuit diagrams of some OLED pixel circuits and explain how they work.