Variable pixel clock electronic shutter control
First Claim
Patent Images
1. A CMOS image sensor, comprising:
- an array of image sensing elements;
a controller for said array of image sensing elements, which produces clock signals to control said array of image sensing elements and which produces first clock signals to control a time of integration beginning, and second clock signals at a second time to control a time of integration ending, said controller controlling said first clock signals to be produced at a same time as said second time for a different row during normal operation, and enabling control of clock-changing operation to set said first clock signal to be produced at a time different than said second time.
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Abstract
CMOS image sensor with a rolling shutter that uses two separate clocks. One of the clocks is used during normal operation. When timing is changed, the other clock is started and used during an interim period to avoid distortion in the image. After that interim period, the new clock timing is coupled to the original clock circuit.
14 Citations
17 Claims
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1. A CMOS image sensor, comprising:
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an array of image sensing elements;
a controller for said array of image sensing elements, which produces clock signals to control said array of image sensing elements and which produces first clock signals to control a time of integration beginning, and second clock signals at a second time to control a time of integration ending, said controller controlling said first clock signals to be produced at a same time as said second time for a different row during normal operation, and enabling control of clock-changing operation to set said first clock signal to be produced at a time different than said second time. - View Dependent Claims (2, 3, 4)
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5. An image sensor, comprising
an array of image sensing elements; -
a controller for said array of image sensing elements, producing a rolling shutter and outputting first clock signals to control said array of image sensing elements; and
a second clock generating elements associated with said controller, which produces a second clock pulse signal during a time-when said rolling shutter is being changed from a first characteristic to a second characteristic, and outputting said second clock signal at the same time as said first clock signals during an interim frame period, and thereafter using said second clock signal as a new rolling shutter. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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controlling an image sensor using a first clock and a second clock which are different;
using said first clock for starting integration times during a first frame, and using said second clock to end integration times during said first frame; and
using said first clock to start and end integration times during a second flame, subsequent to said first frame. - View Dependent Claims (14, 15, 16, 17)
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Specification