Fingerprint detection device and driving method thereof
A fingerprint detection device including a sensor array including a plurality of fingerprint sensor elements arranged in a form of a matrix having a plurality of rows and columns, a filter and buffer unit including a plurality of first banks, each of which is configured to perform a noise elimination operation and a temporal storage operation in parallel with respect to output signals of some different columns of the sensor array. Each of the plurality of first banks simultaneously or consecutively acquires output signals from the fingerprint sensor elements belonging to columns spaced apart from each other by a predetermined distance. A sample and hold unit including second banks, the number of which being the same as the number of the plurality of first banks, performs a sampling and hold function in parallel in response to output signals from the plurality of first banks. An input/output unit receives an output signal from the sample and hold unit to output data of the sensor array.
1. A fingerprint detection device comprising:
a sensor array comprising a plurality of fingerprint sensor elements arranged in a matrix having a plurality of rows and columns;
a filter and buffer unit comprising a plurality of first banks, each of which is configured to perform a noise elimination operation and a temporal storage operation in parallel with respect to output signals of different columns of the sensor array, wherein each of the plurality of first banks simultaneously or consecutively acquires output signals from the fingerprint sensor elements belonging to columns spaced apart from each other by a predetermined distance;
a sample and hold unit comprising a plurality of second banks, the number of second banks being equal to the number of first banks so as to perform a sampling and hold function in parallel in response to output signals from the plurality of first banks; and
an input/output unit configured to receive an output signal from the sample and hold unit to output data of the sensor array.
2. The fingerprint detection device of claim 1 , wherein:
each of the first and second banks comprises n blocks;
the n blocks receive in parallel the output signals of the fingerprint sensor elements from a group of columns of the sensor array corresponding to the first and second banks; and
the columns in the group are spaced apart from each other.
3. The fingerprint detection device of claim 2 , wherein:
each of the blocks of the first and second banks comprises pages, the number of pages being equal to the number of columns belonging to the group of the sensor array; and
each of the pages receives the output signals of the columns arranged to be spaced apart from each other and belonging to the group of the sensor array.
4. A driving method for a fingerprint detection device comprising a plurality of fingerprint sensor elements arranged in a matrix, comprising:
inputting output signals with respect to different columns of a sensor array in parallel to assigned banks among a plurality of first banks of a filter and buffer unit, wherein output signals from the fingerprint sensor elements belonging to columns spaced apart from each other by a predetermined distance are simultaneously or sequentially input;
inputting output signals from the first banks in parallel to second banks of a sample and hold unit corresponding to the first banks; and
inputting output signals from the sample and hold unit to an input/output unit via a signal processor.
5. The driving method for a fingerprint detection device of claim 4 , wherein:
each of the first and second banks comprise n blocks, and
the inputting output signals with respect to different columns of a sensor array in parallel to assigned banks among a plurality of first banks of a filter and buffer unit comprises inputting the output signals of the fingerprint sensor elements from a group of columns of the sensor array configured with the columns spaced apart from each other, to each of the blocks.
6. The driving method for a fingerprint detection device of claim 5 , wherein:
each of the blocks comprises pages, the number of pages being equal to the number of columns belonging to the group of the columns of the sensor array; and
the inputting output signals with respect to different columns of a sensor array in parallel to assigned banks among a plurality of first banks of a filter and buffer unit comprises each of the pages receiving the output signals of the columns spaced apart from each other and belonging to the group of the columns of the sensor array.