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| Muffler |
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| Muffler |
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Device for reading a sensor matrix
| Details |
Inventors: Wieczorek, Herfried;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Fields; Carolyn E.
Assistant Examiner: Dunn; Drew A.
Attorney, Agent or Firm: Squire; William
A device for reading the charges of several sensor elements (12, 13, 22, . . . ) which are arranged in a matrix, for each column of sensors there being provided a common read line (82, 83) while for each row of sensors there is provided a common switching line (19, 29, . . . , 79). In order to achieve a reduction of the read capacitances for each column of sensors there are also provided several segmented read lines (91, 92, . . . ) which are connectable to only a few sensor elements (12, 13, 22, . . . ) of a column, via the switches (2) thereof, and which are individually connectable, via further electric switches (4, 5), to the common read line (82, 83) of the column; for a read operation of a row of sensors, those segmented read lines (91, 92, . . . ) of each column, which are connected to the activated row of sensors, via the switches (2) thereof are connectable to the common read lines (82, 83). |
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DETAILED DESCRIPTION I claim: 1.
A device for reading charges of a plurality of radiation sensitive sensor elements arranged in rows and columns of a matrix comprising: a plurality of said sensor elements in said matrix, each element including a first electric switch; a plurality of read lines, each corresponding to a different column for reading the sensors of that column; a plurality of switching lines, each corresponding to a different row for activating the switches of the corresponding row; a plurality of groups of segmented read lines, each group corresponding to a sensor column, each segmented read line of a group corresponding to and coupled to the first switches of a group of sensor elements of that column, each group of sensor elements corresponding to a different segmented read line; and a plurality of second electric switches for coupling each segmented read line to that one of said plurality of read lines corresponding to a given column such that for a read operation of a sensor row only the segmented read lines connected to the activated sensor row via said first electric switches are electrically coupled to the corresponding read line of that column.
2.
The device of claim 1 wherein said first and second electric switches comprise thin-film transistors.
Description:
BACKGROUND OF THE INVENTION The invention relates to a device for reading charges of several light-sensitive or X-ray sensitive sensor elements which are arranged in rows and columns in a matrix, each sensor element comprising a respective electric switch, for each sensor column there being provided a common read line while for each sensor row there is provided a switching line via which the switches of the sensors can be activated so that the charges of the sensor elements of the activated row are output via the read lines.
A device of this kind is known, for example from DE-OS 35 31 448 which corresponds to U.
S.
Pat.
No.
4,689,487.
The cited document describes a matrix of photocells for an X-ray imaging apparatus, the charges of the photocells being read in that the switches associated with each sensor are activated via a switching line provided per row
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