Detection device

A detection device comprising:

• a sensor panel having a detection region provided with a plurality of sensors that are arranged two-dimensionally and each of which is configured to detect light and generates an output corresponding to a degree of detected light;
• and
• a light source having a plurality of point light sources that are arranged in a light emitting region provided corresponding to the detection region, wherein
• each of the point light sources is turned on and the outputs from the sensors are received in first detection processing,
• each of the point light sources is turned on at a luminance different from the luminance in the first detection processing and the outputs from the sensors are received in second detection processing,
• the luminance of the point light source in the second detection processing is based on a relation between the luminance of the point light source and the outputs from the sensors in the first detection processing,
• the sensors are coupled to a detection circuit that is configured to receive the outputs of the sensors,
• each of the sensors includes a photodiode,
• the photodiode has an anode to which a reference potential is applied and a cathode to which a reset potential is applied, the reset potential is higher than the reference potential, and
• processing of determining the luminance of the point light source in the first detection processing to cause the outputs from the sensors in the second detection processing to be within a lower limit and an upper limit of an input recognizable by the detection circuit includes processing of changing both the reference potential and the reset potential.

A detection device comprising:

• a sensor panel having a detection region provided with a plurality of sensors that are arranged two-dimensionally and each of which is configured to detect light and generates an output corresponding to a degree of detected light;
• and
• a light source having a plurality of point light sources that are arranged in a light emitting region provided corresponding to the detection region, wherein
• each of the point light sources is turned on and the outputs from the sensors are received in first detection processing,
• each of the point light sources is turned on at a luminance different from the luminance in the first detection processing and the outputs from the sensors are received in second detection processing,
• the luminance of the point light source in the second detection processing is based on a relation between the luminance of the point light source and the outputs from the sensors in the first detection processing,
• the sensors are coupled to a detection circuit that is configured to receive the outputs of the sensors,
• each of the sensors includes a photodiode,
• the photodiode has an anode to which a reference potential is applied and a cathode to which a reset potential is applied, the reset potential is higher than the reference potential,
• a configuration that functions as an electrical resistor is interposed between each of the sensors and the detection circuit,
• a current source that is configured to provide a bias current is coupled to a coupling path between the electrical resistor and the detection circuit, and
• processing of determining the luminance of the point light source in the first detection processing to cause the outputs from the sensors in the second detection processing to be within a lower limit and an upper limit of an input recognizable by the detection circuit includes processing of changing the bias current.