Solid-state image pickup device having analog-digital converters configured to sum values of multiple pixels in the array and method for driving the same
First Claim
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1. A solid-state image pickup device comprising:
- a pixel array unit including unit pixels which are two-dimensionally arranged in a matrix pattern, each unit pixel including a photoelectric converter, and column signal lines corresponding to respective columns of the matrix pattern;
row scanning means for selectively controlling each unit pixel of the pixel array unit in units of rows;
analog-digital converting means for converting analog signals output from the unit pixels in a row selectively-controlled by the row scanning means through the column signal lines to digital signals, adding the obtained digital signals among a plurality of unit pixels, and outputting the added digital signals;
column scanning means for controlling output of the digital signals added in the analog-digital converting means; and
an output line for transmitting the digital signals output from the analog-digital converting means under control by the column scanning means,wherein the row scanning means comprises an address decoder which selectively controls each unit pixel of the pixel array unit in units of arbitrary rows.
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Abstract
A CMOS image sensor includes column-parallel ADCs. Each of the ADCs includes a comparator and an up/down counter. With this configuration, digital values of pixels in a plurality of rows can be added without using additional circuits, such as an adder and a line memory device, and the frame rate can be increased while maintaining constant sensitivity.
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Citations
11 Claims
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1. A solid-state image pickup device comprising:
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a pixel array unit including unit pixels which are two-dimensionally arranged in a matrix pattern, each unit pixel including a photoelectric converter, and column signal lines corresponding to respective columns of the matrix pattern; row scanning means for selectively controlling each unit pixel of the pixel array unit in units of rows; analog-digital converting means for converting analog signals output from the unit pixels in a row selectively-controlled by the row scanning means through the column signal lines to digital signals, adding the obtained digital signals among a plurality of unit pixels, and outputting the added digital signals; column scanning means for controlling output of the digital signals added in the analog-digital converting means; and an output line for transmitting the digital signals output from the analog-digital converting means under control by the column scanning means, wherein the row scanning means comprises an address decoder which selectively controls each unit pixel of the pixel array unit in units of arbitrary rows. - View Dependent Claims (2, 3, 4, 5)
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6. A method for driving a solid-state image pickup device comprising a pixel array unit including unit pixels which are two-dimensionally arranged in a matrix pattern, each unit pixel including a photoelectric converter, and column signal lines corresponding to respective columns of the matrix pattern and a plurality of analog-digital converting units, each analog-digital converting unit being connected to a respective column signal line, the unit pixels being selectively controlled in units of rows, and the method comprising:
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converting analog signals output from the unit pixels in a row selected by the selective control through the column signal lines to digital signals via the analog-digital converting units, adding the digital signals among a plurality of unit pixels via the analog-digital converting units, and reading the added digital signals from the analog-digital converting units, wherein each unit pixel in the pixel array unit is selectively controlled in units of arbitrary rows. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification