An exposure device includes a support for supporting a panel, a light source unit for radiating a light beam onto the panel through a shadow mask, and optical lenses for correcting the trajectory of the light beam from the light source unit. The amplifier circuit may be configured to generate an output signal having a transimpedance bandwidth in response to an input signal. A detection circuit is disposed on the inner housing for communicating with the ID module of the cover and determining identification of the cover.