Patent ID: 7391004

Claim:
A photo detecting apparatus, comprising: a plurality of pairs of data lines each pair thereof including a first data line and a second data line; a plurality of scanning lines; and pixel circuits, arranged respectively in intersections of said plurality of pairs of data lines and said plurality of scanning lines, the pixel circuit including: a photo detecting element one end of which is connected to a first fixed voltage line; a first detector which amplifies a voltage obtained by charging and discharging a capacitance of the photo detecting element with a photocurrent flowing through the photo detecting element and which outputs an amplified voltage to the first data line; and a second detector which outputs an electric charge stored in the capacitance of the photo detecting element by the photocurrent, to the second data line, wherein the pixel circuit operates in a first operation mode where the first detector is activated, a second operation mode where the second detector is activated and an initialization mode where the photo detecting element is initialized, wherein the second detector includes a first transistor provided between the other end of the photo detecting element and the second data line; an electric charge stored in the capacitance is outputted to the second data line by turning on the first transistor in the second operation mode; and a reset voltage set in the second data line is applied to the other end of the photo detecting element to initialize the photo detecting element by turning on the first transistor in the initialization mode.