Display device and semiconductor device

摘要

An object is to detect reflected light from an object accurately and to improve accuracy of capturing an image in a photosensor included in a display panel. In the display panel including a photosensor, when an image of an object is captured, light is emitted from a light source to the object and reflected light enters the photosensor. In the case where the incident light is too strong with respect to sensitivity of the photosensor, luminance of the light source is lowered. In the case where the incident light is too weak with respect to sensitivity of the photosensor, the luminance of the light source is increased.

主权项

1. A semiconductor device comprising:
a photosensor; a light source; and a controller, wherein the light source is configured to irradiate paper with light, wherein the photosensor is configured to detect the light reflected by the paper, and wherein the controller is configured to lower the luminance of the light from the light source when the luminance of the light detected by the photosensor is higher than a first value and to increase the luminance of the light from the light source when the luminance of the light detected by the photosensor is lower than a second value.