Patent ID: 11960678
Assignee: ALPINE ELECTRONICS, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 8:
9. 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.