An apparatus to control a display panel of an electronic device , the apparatus comprising: a user presence detector configured to determine a presence of a user relative to the device based on image data generated by an image sensor of the electronic device; a gaze detector configured to determine a direction of a gaze of the user relative to the image sensor based on the image data, the direction of the gaze of the user relative to the image sensor being indicative of the direction of the gaze of the user relative to a display screen of the display panel; and a backlight manager configured to selectively adjust a display brightness based on the presence of the user and the direction of the gaze of the user; wherein the image data is first image data collected at a first time and the gaze detector is configured to analyze second image data collected at a second time occurring after the first time and to determine a direction of the gaze of the user relative to the image sensor at the second time; and characterised in that: the gaze detector is further configured to determine whether a change in the direction of the gaze of the user between the first time and the second time is toward or away from the display screen; and the backlight manager is configured to increase the display brightness when the change in the direction of the gaze of the user is determined to be toward the display screen, and to decrease the display brightness when the change in the direction of the gaze of the user is determined to be away from the display screen. a user presence detector configured to determine a presence of a user relative to the device based on image data generated by an image sensor of the electronic device; a gaze detector configured to determine a direction of a gaze of the user relative to the image sensor based on the image data, the direction of the gaze of the user relative to the image sensor being indicative of the direction of the gaze of the user relative to a display screen of the display panel; and a backlight manager configured to selectively adjust a display brightness based on the presence of the user and the direction of the gaze of the user; wherein the image data is first image data collected at a first time and the gaze detector is configured to analyze second image data collected at a second time occurring after the first time and to determine a direction of the gaze of the user relative to the image sensor at the second time; and characterised in that: the gaze detector is further configured to determine whether a change in the direction of the gaze of the user between the first time and the second time is toward or away from the display screen; and the backlight manager is configured to increase the display brightness when the change in the direction of the gaze of the user is determined to be toward the display screen, and to decrease the display brightness when the change in the direction of the gaze of the user is determined to be away from the display screen. the gaze detector is further configured to determine whether a change in the direction of the gaze of the user between the first time and the second time is toward or away from the display screen; and the backlight manager is configured to increase the display brightness when the change in the direction of the gaze of the user is determined to be toward the display screen, and to decrease the display brightness when the change in the direction of the gaze of the user is determined to be away from the display screen. <EOS>