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DT028B vs DT028C Initialization Code

Does the DT028BTFT (a-Si) and DT028CTFT (IPS, normally black) require different initialization code/commands? 

I tried replacing a Display from another manufacturer with the 28B and the 28B looked very similar (coloring was slightly blue).  But when I tried the 28C, the display colors were "inverted" where black and white were reversed (and colors were different). 

Note: I have not tried changing the initialization code to the code provided on your website (I will try this next)

Is it possible to drive the DT028CTFT with 3.3v?

Hi! After reading the specifications, I noticed that although it lists 2.8v as the typical voltage for the display, it lists 3.3v as the maximum VCC voltage for the DT028CTFT. However it also lists 4.6v as the absolute maximum. Is it possible to drive the DT028CTFT display with 3.3v without damaging or degrading it? Or do I need to step down the voltage to 2.8v.

Thanks in advance