5 V to 1.7v (in SPI)

I am trying to light-up a OLED. It follows a certain sequence of applying voltage and sending code. the controller I'm using (PIC16F877A) gives out 5v during data transmission (3 wire SPI, Controller is master, OLED is slave),but the OLED supply is at 2.4 v and input high level is at 1.7v. I am following the exact circuit and sequence as on the Datasheet of the OLED. I need to know if this would a problem as the OLED does not light-up.

Note:
Data from Controller is good (Checked from DSO)....

5 V to 1.7v (in SPI)