Variable pixel clock electronic shutter control
First Claim
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1. A controller for producing a rolling shutter to control an image sensor, the controller comprising:
- a row read module, operating in accordance with a first clock speed, the row read module for producing first signals to control an integration beginning of the image sensor, second signals to control an integration ending of the image sensor, and third signals when a pixel clock speed change is required; and
a row read jumping module, operating in accordance with a second different clock speed, the row read jumping module connected to receive the third signals and for outputting to the row read module fourth signals to control the integration beginning of the image sensor in accordance with the second clock speed.
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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.
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Citations
18 Claims
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1. A controller for producing a rolling shutter to control an image sensor, the controller comprising:
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a row read module, operating in accordance with a first clock speed, the row read module for producing first signals to control an integration beginning of the image sensor, second signals to control an integration ending of the image sensor, and third signals when a pixel clock speed change is required; and a row read jumping module, operating in accordance with a second different clock speed, the row read jumping module connected to receive the third signals and for outputting to the row read module fourth signals to control the integration beginning of the image sensor in accordance with the second clock speed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A controller for producing a rolling shutter to control an image sensor, the controller comprising:
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a first module for producing the rolling shutter and outputting first clock signals to control the image sensor; and a second module in communication with the first module, said second module for producing a second clock signal during a time when the rolling shutter is being changed from a first characteristic to a second characteristic, and outputting the second clock signal at a same time as the first clock signals during an interim frame period, wherein the first module thereafter uses the second clock signal to produce a new rolling shutter at a rate associated with said second clock signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An image sensor comprising:
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an array of image sensing elements; and a controller connected to the array and for producing a rolling shutter to control the image sensing elements, the controller comprising; a row read module, operating in accordance with a first clock speed, the row read module for producing first signals to control an integration beginning of the image sensor, second signals to control an integration ending of the image sensor, and third signals when a pixel clock speed change is required; and a row read jumping module, operating in accordance with a second different clock speed, the row read jumping module connected to receive the third signals and for outputting to the row read module fourth signals to control the integration beginning of the image sensor in accordance with the second clock speed. - View Dependent Claims (15, 16, 17, 18)
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Specification