I have been looking at the power up sequence for the TPS65185 display PMIC, as we have been experiencing some failed displays in the field. I have seen some consistent glitches on the power rails.
The VPOS, VNEG, VDDH and VEE power rails all have these glitches on power up and power down. I have attached a waveform illustrating a glitch on the VNEG supply rail (blue trace) , the yellow trace is VDD.