CMOS image sensors and methods for outputting pixel data at high speeds
View Patent ↗A The CMOS image sensor includes a pixel array including pixels arranged in a matrix of rows and columns and a row selection unit configured to generate selection signals for simultaneously or concurrently selecting at least two rows from the rows of the pixel array in response to a received row address. An analog-to-digital conversion unit is configured to convert pixel data output from the at least two rows selected from the pixel array into a digital video signal and output the digital video signal. The pixel array outputs the pixel data in response to the selection signals.
1. An image sensor comprising:
a pixel array including a plurality of pixels arranged in a matrix of rows and columns;
a row selection unit configured to generate selection signals for concurrently or simultaneously selecting at least two rows from the rows of the pixel array in response to a received row address; and
an analog-to-digital conversion unit configured to convert pixel data output from the at least two rows selected from the pixel array into a digital video signal and output the digital video signal; wherein
the pixel array outputs the pixel data in response to the selection signals.
2. The image sensor of claim 1 , wherein the row selection unit comprises:
a plurality of row drivers, each of the plurality of row drivers being configured to output selection signals for concurrently or simultaneously selecting at least two rows from one of a plurality of areas of the pixel array.
3. The image sensor of claim 1 , wherein the analog-to-digital conversion unit comprises:
a plurality of analog-to-digital converters, each of the plurality of analog-to-digital converters being configured to convert pixel data, generated from a column included in a corresponding area among a plurality of areas of the pixel array, into a digital video signal.
4. The image sensor of claim 1 , wherein the analog-to-digital conversion unit comprises:
a plurality of analog-to-digital converter units, each of the plurality of analog-to-digital converter units being configured to sequentially convert pixel data generated from at least two pixels of a corresponding column among the columns of the pixel array into a digital video signal and further configured to output the digital video signal, wherein
the conversion by the analog-to-digital converter units is performed sequentially in a column direction.
5. The image sensor of claim 1 , wherein
the pixel data includes first pixel data and second pixel data and the digital video signal includes a first digital video signal and a second digital video signal; and the analog-to-digital conversion unit is further configured to,
convert the first pixel data output from a first row among the at least two selected rows into the first digital video signal,
output the first digital video signal,
convert the second pixel data output from a second row among the at least two selected rows into the second digital video signal, and
output the second digital video signal.
6. The image sensor of claim 1 , wherein the analog-to-digital conversion unit sequentially or alternately performs analog-to-digital conversion of the pixel data output from the pixel array in a column direction.
7. An electronic system comprising the image sensor of claim 1 .
8. The image sensor of claim 1 , wherein the analog-to-digital conversion unit comprises:
a plurality of analog-to-digital converter units configured to convert the pixel data output from the columns of the pixel array into the digital video signal.
9. The image sensor of claim 8 , wherein the number of the analog-to-digital converter units is less than or equal to a number of the columns of the pixel array.
10. The image sensor of claim 1 , wherein the row selection unit comprises:
a first row driver and a second row driver disposed at opposite sides of the pixel array.
11. The image sensor of claim 10 , wherein the analog-to-digital conversion unit comprises:
a first analog-to-digital converter unit and a second analog-to-digital converter unit, each of the first and second analog-to-digital converter units converting pixel data from pixels in the at least two rows separately, the first and second analog-to-digital converter units being disposed at opposite sides of the pixel array.
12. The image sensor of claim 1 , wherein the row selection unit comprises:
a first row driver configured to select a first row from the rows of the pixel array; and
a second row driver configured to select a second row from the rows of the pixel array simultaneously when the first row driver selects the first row.
13. The image sensor of claim 12 , wherein the first row is an odd row and the second row is an even row.
14. The image sensor of claim 12 , wherein
the pixel data includes first pixel data and second pixel data and the digital video signal includes a first digital video signal and a second digital video signal, and wherein the analog-to-digital conversion unit includes,
a first analog-to-digital converter unit configured to convert the first pixel data output from the first row into the first digital video signal and output the first digital video signal; and
a second analog-to-digital converter unit configured to convert the second pixel data output from the second row into the second digital video signal and output the second digital video signal.
15. The image sensor of claim 1 , wherein the pixel array includes a plurality of pixel array areas, each of the plurality of pixel array areas having a corresponding row selection unit and analog-to-digital conversion unit.
16. The image sensor of claim 15 , wherein each row selection unit is configured to generate selection signals for concurrently or simultaneously selecting at least two rows from rows of a corresponding pixel array area in response to a received row address, and each analog-to-digital conversion unit is configured to convert pixel data output from the at least two rows selected from the corresponding pixel array area into a corresponding digital video signal.
17. The image sensor of claim 15 , wherein
the pixel data output from the corresponding pixel array area includes first pixel data and second pixel data and the corresponding digital video signal includes a first digital video signal and a second digital video signal; and
each analog-to-digital conversion unit is further configured to,
convert the first pixel data output from a first row among the at least two rows selected from the corresponding pixel array area into the first digital video signal,
output the first digital video signal,
convert the second pixel data output from a second row among the at least two rows selected from the corresponding pixel array area into the second digital video signal, and
output the second digital video signal.
18. An image sensing method for image sensor, the method comprising;
generating selection signals for concurrently or simultaneously selecting at least two rows from a plurality of rows of a pixel array in response to a received row address, the pixel array including a plurality of pixels arranged in a matrix of rows and columns;
outputting pixel data in response to the selection signals;
converting the output pixel data into a digital video signal; and
outputting the digital video signal.
19. The image sensing method of claim 18 , wherein
the selection signals are signals for concurrently or simultaneously selecting at least two rows from one of a plurality of areas of the pixel array.
20. The image sensing method of claim 18 , wherein
the digital video signal is converted pixel data, generated from a column included in a corresponding area among a plurality of areas of the pixel array.