You can use other displays for sure (search for my posts showing how to use DPI interface)! Problem with your nice smartwatch (?) screen is the MIPI interface! MIPI interface is (still) closed source on the RPi since it's handled by GPU firmware. And, I bet your touchscreen is simple I2C and not MI...
Hi there, I'm quite new to the RPi business, so bear with me I was wondering if it's possible to connect a touchscreen which has mipi dsi directly to the Raspberry Pi? example: https://s12.postimg.org/gfgc8zlm1/Screen_Shot_2016_11_28_at_09_22_26.png If not which type of connector is needed for this ...