| 摘要 |
Accuracy of photodetection is improved. An input-output device includes a light unit including Z (Z is a natural number of 3 or more) first light-emitting diodes that emit light with a wavelength in a visible light range and a second light-emitting diode that emits light with a wavelength in an infrared range; a display circuit that is supplied with a display selection signal, supplied with a display data signal in accordance with the display selection signal, and set to be in a display state based on data of the input display data signal; and Y (Y is a natural number) photodetectors including a filter for absorbing light with a wavelength in a visible light range, supplied with a photodetection control signal is input, and generating data based on the illuminance of incident light in accordance with the input photodetection control signal.
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