Physical quantity distribution sensor, method of driving said sensor and method of producing said sensor
View Patent ↗A physical quantity distribution sensor is disclosed. The sensor comprises: a plurality of sensor/storage sections each having a sensor element for sensing a received physical quantity and a storage element for storing the information of physical quantity sensed by the sensor element; a selector for selecting at least one of the sensor/storage sections; and a plurality of buffers each capable of detecting and supplying the information stored in at least one selected sensor/storage section. This sensor further comprises at least one selection signal transfer line for transferring an output of the selector. Power supply input portions of the buffers are connected to the selection signal transfer line, and the buffers are operated using, as a power voltage, an output of the selector entered into the buffers through the selection signal transfer line.
1. A physical quantity distribution sensor having a plurality of unit cells arranged in N row(s) and M columns (N being a natural number not less than 1 and M being a natural number not less than 2), each of said plurality of unit cells comprising a sensor/storage section for sensing and storing information of a physical quantity,
wherein said sensor comprises:
a column selector for selecting at least one column out of said M columns; and
source follower circuits in said M columns each for detecting and supplying the information stored in said sensor/storage section in a selected column,
said sensor arranged and configured such that a unit cell in said at least one column is electrically connectable to a power supply voltage while another unit cell in a column not selected by said column selector is not electrically connectable to said power supply voltage, and
wherein each of said source follower circuits comprises a driving transistor in said unit cell and another transistor which serves as an electric current switch of the source follower circuit, and
said another transistor includes a gate directly connected to a gate of a corresponding column selection transistor included in said column selector.
2. The physical quantity distribution sensor of claim 1 , wherein the unit cell in said at least one column is electrically connectable to a horizontal signal line while the another unit cell in the colunm not selected by said column selector is not electrically connectable to said horizontal signal line.
3. The physical quantity distribution sensor of claim 1 , wherein said power supply voltage is electrically connectable to a horizontal signal line via a source follower circuit in said at least one column while said power supply voltage is not electrically connectable to said horizontal signal line via another source follower circuit in the column not selected by said colunm selector.