Proximity detection device to detect a user's approach to a display surface comprising a sensitivity setting unit

A proximity detection device, which detects a user's approach to a display surface of a display, comprising:

• a plurality of infrared light sources that are arrayed along a first side, which is one side of the display surface, outside the display surface of the display and emit infrared light passing the front of the display surface;
• a plurality of infrared light sources that are arrayed along a second side of the display surface, which is a side opposing the first side, outside the display surface and emit infrared light passing the front of the display surface;
• one or a plurality of light detectors arranged outside the display surface;
• a proximity detection unit that detects the user's approach to the display surface with a set sensitivity using an intensity of reflected light of the infrared light emitted by each of the infrared light sources detected by the light detector;
• and
• a sensitivity setting unit that estimates a first-direction position, which is a position where reflection in a first direction occurs, according to intensities of beams of reflected light of infrared light emitted by a plurality of infrared light sources having different positions in the first direction, which is a direction along the first side, detected by the light detector, estimates a second-direction position, which is a position where reflection in a second direction occurs, according to intensities of beams of reflected light of infrared light emitted by a plurality of infrared light sources having different positions in the second direction, which is a direction along a side perpendicular to the first side, detected by the light detector, and sets the sensitivity of the proximity detection unit to a sensitivity determined according to the estimated first-direction position and second-direction position and a preset relationship among the first-direction position, the second-direction position, and the sensitivity.