A display apparatus comprising: a screen ; a light source configured to output a laser beam for scanning the screen ; a dimming unit including a plurality of slide-able filters, wherein each filter forms one of a plurality of regions of the dimming unit, the filters are consecutively arranged along one direction, and the filters have transmittances that are mutually different from one another; a switching unit configured to switch between the filters of the dimming unit through which the laser beam passes by sliding the filters along said one direction to dispose one of the filters in the optical path of the laser beam; a scanning unit configured to scan a scan area of the screen at a predetermined frame rate with the laser beam which has passed through the dimming unit , the scan area having a first area in which an image is formed and a second area different from the first area; a sensor disposed in the second area that is configured to detect a light amount of the laser beam scanning the second area ; and a first determiner configured to determine a boundary timing at which, due to the switching unit having switched between two adjacent filters, the laser beam outputted from the light source has passed through a boundary portion between the two adjacent filters of the dimming unit , the determination being based on characteristics of a temporal change of a signal representing the detected light amount by the sensor , and a controller configured to control a light amount of the laser beam outputted from the light source based on the determined boundary timing, so as to suppress an abrupt fluctuation of a light amount of the laser beam scanning the first area in a period in which the laser beam outputted from the light source passes through the boundary portion. a screen ; a light source configured to output a laser beam for scanning the screen ; a dimming unit including a plurality of slide-able filters, wherein each filter forms one of a plurality of regions of the dimming unit, the filters are consecutively arranged along one direction, and the filters have transmittances that are mutually different from one another; a switching unit configured to switch between the filters of the dimming unit through which the laser beam passes by sliding the filters along said one direction to dispose one of the filters in the optical path of the laser beam; a scanning unit configured to scan a scan area of the screen at a predetermined frame rate with the laser beam which has passed through the dimming unit , the scan area having a first area in which an image is formed and a second area different from the first area; a sensor disposed in the second area that is configured to detect a light amount of the laser beam scanning the second area ; and a first determiner configured to determine a boundary timing at which, due to the switching unit having switched between two adjacent filters, the laser beam outputted from the light source has passed through a boundary portion between the two adjacent filters of the dimming unit , the determination being based on characteristics of a temporal change of a signal representing the detected light amount by the sensor , and a controller configured to control a light amount of the laser beam outputted from the light source based on the determined boundary timing, so as to suppress an abrupt fluctuation of a light amount of the laser beam scanning the first area in a period in which the laser beam outputted from the light source passes through the boundary portion. <EOS>