Patent ID: 7236192

Claim:
An image-sensing device comprising: a plurality of pixels each comprising a photosensitive element that generates an electric signal proportional to an amount of incident light and a transistor that outputs an analog signal that is natural-logarithmically proportional to the amount of incident light; and a level adjuster that adjusts a level of the analog signal output from the pixels by adjusting, according to the analog signal output from the pixels, a bias voltage fed to the transistor, wherein: the photosensitive element receives at a second electrode thereof a direct-current voltage; the transistor has a first electrode, a second electrode, and a control electrode, the transistor having the second electrode thereof connected to a first electrode of the photosensitive element so that electric charge output from the photosensitive element flows into the transistor, the transistor receiving at the first and control electrodes thereof direct-current voltages individually so that the transistor operates in a subthreshold region; and the level adjuster adjusts the level of the analog signal output from the pixels by adjusting the direct-current voltage applied to the control electrode of the transistor.