Logic voltages have been getting lower for at least 40 years now.
A 1.8 - 3.3V (Abs Max) display is perfect for example for interfacing with a 2.5V or 1.8V io bank (Which is then a good fit for a DDR2 memory or something connected elsewhere on the same rail).
3.3V logic is common but anyone designing with a modern ASIC or FPGA would really prefer lower voltages, and IO in the 1.8-2.5V region seems commonplace at the moment in the sorts of applications that buy displays in volume.
I recently did a design where the ONLY use of the 5V rail was USB, time was 5V logic was everywhere.
All the logic action in that design was 2.5/1.8/1V, I did not even bother with 3.3V except to deal with the USB port and some external IO.
You design the PCB to match the device you want to drive, nobody designs a display to support an existing PCB (Every one of the stupid things has a different FPC pinout anyway!).