Patent ID: 7952634

Claim:
An image sensing apparatus comprising: a pixel array including an optical black region and an effective pixel region; and a scanning unit which reads signals generated at the pixel array, the scanning unit including: a first shift register which reads signals of the optical black region by a shift operation for a first period; and a second shift register which reads signals of the effective pixel region by a shift operation, wherein the second shift register starts a shift operation during the first period when the first shift register reads the signals of the optical black region, and reads signals of a readout region serving as a partial region of the effective pixel region during a second period following the first period, and wherein the scanning unit further includes a plurality of signal lines which connect the second shift register to the pixel array to read the signals of the effective pixel region, and an enable circuit which disables the plurality of signal lines during the first period and enables the plurality of signal lines during the second period, and the first shift register controls the enable circuit to enable the plurality of signal lines in response to an end of reading the optical black region.