Image sensor including temperature sensor and electronic shutter function
View Patent ↗An image capture device includes an image sensor. The image sensor includes a temperature sensor for measuring temperature measurements of the image sensor. A timing generator is coupled to the image sensor for applying an electronic shutter pulse to the image sensor to drain away all charge in photodiodes of the image sensing region prior to image capture. A reading component is coupled to the temperature sensor for reading the temperature measurements from the temperature sensor. The image capture device is configured to prevent erroneous temperature readings by the reading component resulting from substrate punch-through from the application of the electronic shutter pulse.
1. An image capture device comprising:
an image sensor including an image sensing region and a temperature sensor configured to measure temperature measurements of said image sensor, wherein said image sensing region and said temperature sensor are formed in a semiconductor substrate;
a timing generator configured to apply an electronic shutter pulse to said image sensor by applying a high voltage pulse to said semiconductor substrate;
a reading component configured to read temperature measurements from said temperature sensor; and
a processor configured to instruct said timing generator to apply the electronic shutter pulse to said image sensor and to disable the reading of the temperature measurements by said reading component during the application of the electronic shutter pulse.
2. The device as set forth in claim 1 further comprising a cooler configured to cool said image sensor based on the temperature measurements by said temperature sensor.
3. The device as set forth in claim 1 wherein said reading component is an analog-to-digital converter.
4. The device as set forth in claim 1 wherein said temperature sensor is a diode.
5. The device as set forth in claim 4 wherein said image sensor includes an n-type substrate and wherein said diode is disposed in a p-type well in the n-type substrate and includes an n-plus implant in said p-type well.
6. An image capture device comprising:
an image sensor including a temperature sensor configured to measure temperature measurements of said image sensor, wherein said temperature sensor is a diode;
a timing generator configured to apply an electronic shutter pulse to said image sensor;
a reading component configured to read temperature measurements from said temperature sensor, wherein a cathode of said diode is connected to said reading component and an anode of said diode is connected to ground; and
a processor configured to instruct said timing generator to apply the electronic shutter pulse to said image sensor and to disable the reading of the temperature measurements by said reading component during the application of the electronic shutter pulse.