Abstract: A projection device and an operation method of the projection device are provided. The projection device includes a driver, a LED module, a current sensor, and a controller. The driver generates a driving current signal according to a control signal. The LED module provides an output light beam in response to the driving current signal. The current sensor senses a driving current flowing through the LED module to generate a sensing signal. The controller generates the control signal according to a current calibration parameter and a first control parameter, and determines whether a current value of the driving current flowing through the LED module is in a target driving current value range. When the current value of the driving current is not in the target drive current value range, the controller changes the first control parameter to adjust the control signal.