Image sensing device, process for driving such a device and electrical signal generated in such a device
First Claim
1. Process for driving an image sensing device having an image cell with a photo-sensitive element, a detection node and an output pin, comprising the steps of:
- transferring charges accumulated during a first period of time from the photo-sensitive element to the detection node, thereby obtaining a first voltage;
generating on the output pin a first value corresponding to the first voltage;
transferring charges accumulated during a second period of time from the photo-sensitive element to the detection node, thereby obtaining a second voltage;
generating on the output pin a second value corresponding to the second voltage.
4 Assignments
0 Petitions
Accused Products
Abstract
An image sensing device has an image cell with a photo-sensitive element, a detection node and an output pin. Charges accumulated during a first period of time are transferred from the photo-sensitive element to the detection node, thereby obtaining a first voltage, and kept on the detection node which is thus used as a memory. Some moments later, a first value corresponding to the first voltage is generated on the output pin, charges accumulated during a second period of time are transferred from the photo-sensitive element to the detection node, thereby obtaining a second voltage, and a second value is generated on the output pin corresponding to the second voltage. The signal thus generated is also proposed.
8 Citations
12 Claims
-
1. Process for driving an image sensing device having an image cell with a photo-sensitive element, a detection node and an output pin, comprising the steps of:
-
transferring charges accumulated during a first period of time from the photo-sensitive element to the detection node, thereby obtaining a first voltage;
generating on the output pin a first value corresponding to the first voltage;
transferring charges accumulated during a second period of time from the photo-sensitive element to the detection node, thereby obtaining a second voltage;
generating on the output pin a second value corresponding to the second voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. Process for driving an image sensing device having a first image cell with a first photo-sensitive element, a first detection node and a first output pin, and a second image cell with a second photo-sensitive element, a second detection node and a second output pin, the first output pin and the second output pin being connected to a common output wire, comprising the steps of:
-
transferring charges accumulated during a first time-length from the first photo-sensitive element to the first detection node, thereby obtaining a first voltage;
transferring charges accumulated during the first time-length from the second photo-sensitive element to the second detection node, thereby obtaining a second voltage;
generating on the first output pin a first value corresponding to the first voltage;
transferring charges accumulated during a second time-length from the first photo-sensitive element to the first detection node, thereby obtaining a third voltage;
generating on the first output pin a second value corresponding to the third voltage;
generating on the second output pin a third value corresponding to the second voltage. - View Dependent Claims (9)
-
-
10. Electrical signal generated in an image sensing device having a first image cell and a second image cell, taking over increasing time:
-
a first value representing light received by the first image cell during a first time-length;
a second value representing light received by the first image cell during a second time-length;
a third value representing light received by the second image cell during the first time-length;
a fourth value representing light received by the second image cell during the second time-length.
-
-
11. Image sensing device having an image cell with a photo-sensitive element, a detection node and an output pin, comprising:
-
transfer means for transferring charges from the photo-sensitive element to the detection node;
read-out means for generating on the output pin a value based on the detection node voltage;
driving means for controlling the transfer means and the read-out means so that at least two values are generated during an integration period. - View Dependent Claims (12)
-
Specification