Solid-state imaging device and a method for driving the same

A solid-state imaging device comprising:

• a pixel portion including n pixels (i=1 to n) arranged in a first direction, said pixels converting light into electric charge and accumulating electric charge;
• first charge transfer means coupled to said pixel portion, for transferring a signal read from each of the pixels arranged in said pixel portion in said first direction;
• second charge transfer means coupled to one end of said first charge transfer means, for receiving the signal transferred by said first charge transfer means and for transferring the received signal in a second direction;
• output means coupled to one end of said second charge transfer means for receiving the signal transferred by said second charge transfer means and for converting the received signal into an image signal to output to an external device;
• and
• driving means for driving said first charge transfer means,
• wherein said n pixels include a first pixel (i=1) to an n-th pixel (i=n), said first pixel being arranged nearest to said second charge transfer means, said n-th pixel being arranged farthest from said second charge transfer means,
• wherein said first charge transfer means includes a first bit portion (i=1) to an n-th bit portion (i=n), said first bit portion being arranged nearest to said second charge transfer means, said n-th bit portion being arranged farthest from said second charge transfer means, and
• wherein said driving means generates a plurality of driving signals for:
• (1) reading a signal from said first pixel (i=1) of said n pixels arranged in said pixel portion into said first charge transfer means over k bit portions thereof starting from said first bit portion (i=1) thereof;
• (2) transferring the read signal corresponding to k bits of said first charge transfer means in said first direction during one horizontal blanking period;
• (3) reading a signal from an (i+1)-th pixel of said n pixels arranged in said pixel portion into said first charge transfer means over k bit portions thereof starting from an (i+1)-th bit portion thereof after shifting said read signal corresponding to the k bits of said first charge transfer means towards said second charge transfer means by (k-1) bits;
• (4) repeating said steps through (3) for i=1 to i=n-1;
• and
• (5) repeating said step (2) after said n-th pixel farthest from said second charge transfer means has been read.