Round LCD displays can be made by some of the low volume custom houses, But, expect to pay dearly for them. Small LCDs are typically made in a score & break process as an array from glass approximately 7" or 14" square glass stock. A round LCD would have to be cut and built individually.
The typcial approach when there is a call for a round display is to put the round graphics on a square display, and use the overlaying bezel to accent and give the appearance of being round.
The only round LCD I have seen was one for a Military aircraft application. I once saw a design using a hexagonal LCD in a high-end consumer product, but again the cost was high due to extra glass trimming and processing.