The MPU6050 breakout board VCC requires 5V they have a 3.3v regulator onboard. you may consider bypassing the regulator if you are attempting to supply the MPU6050 with 3.3v also since you are connecting multiple I2c devices that both your display and the MPU 6050 have pullup resistors on each. depending on the values of the resistors your devices may not be able to drop to a low enough voltage to properly provide a low state on the i2c buss.