Image sensor with transfer transistors whose on periods are controlled by timing signals based on transistor transfer efficiencies
First Claim
1. An image capturing apparatus comprising:
- an image sensor which includes a plurality of pixel groups, each pixel group including a plurality of pixel units and a floating diffusion unit which temporarily accumulates charges from the plurality of pixels, each pixel unit including a photo-electric conversion unit which converts light into charges and a transfer transistor which transfers the charges from the photo-electric conversion unit to the floating diffusion unit of the corresponding pixel group, anda timing signal generator which generates timing signals and outputs the generated timing signals to said image sensor,wherein at least two of the transfer transistors of a predetermined pixel group are turned on for different periods by the timing signals based on transfer efficiencies of the at least two transfer transistors.
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Abstract
An image sensor in which one unit structure includes a plurality of photo-electric conversion units, a floating diffusion, a plurality of transfer transistors which are arranged in correspondence with the plurality of photo-electric conversion units so as to transfer charges respectively converted by the plurality of photo-electric conversion units to the floating diffusion, a source-follower amplifier which outputs a voltage signal according to a charge amount of the floating diffusion, and a reset transistor which resets the plurality of photo-electric conversion units and the floating diffusion, and a plurality of unit structures are two-dimensionally arranged in a row direction and a column direction, the image sensor comprising a control unit which divides the plurality of unit structures into a plurality of groups, and controls the transfer transistors for each divided group.
11 Citations
12 Claims
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1. An image capturing apparatus comprising:
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an image sensor which includes a plurality of pixel groups, each pixel group including a plurality of pixel units and a floating diffusion unit which temporarily accumulates charges from the plurality of pixels, each pixel unit including a photo-electric conversion unit which converts light into charges and a transfer transistor which transfers the charges from the photo-electric conversion unit to the floating diffusion unit of the corresponding pixel group, and a timing signal generator which generates timing signals and outputs the generated timing signals to said image sensor, wherein at least two of the transfer transistors of a predetermined pixel group are turned on for different periods by the timing signals based on transfer efficiencies of the at least two transfer transistors. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control method of an image sensor which includes a plurality of pixel groups, each pixel group including a plurality of pixel units and a floating diffusion unit which temporarily accumulates charges from the plurality of pixels, each pixel unit including a photo-electric conversion unit which converts light into charges and a transfer transistor which transfers the charges from the photoelectric conversion unit to the floating diffusion unit of a pixel group, said control method comprising:
a control step of controlling at least two of the transfer transistors of a predetermined pixel group to turn on for different periods by timing signals based on transfer efficiencies of the at least two transfer transistors. - View Dependent Claims (8, 9, 10, 11, 12)
Specification