Image sensor
An image sensor, image technology, applied in the direction of image communication, TV, color TV parts, etc.
Active Publication Date: 2014-12-03
NOVATEK MICROELECTRONICS CORP
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[0007] However, since the image sensor 20 does not include the reference pixel array 120 for the pixel reading circuit 200 or the image signal processor 114 to compensate for random noise, only a capacitor CB is added to the pixel reading circuit 200 to bias the reference voltage in a bias circuit 210 The input terminal of BIAS prevents random noise from entering the pixel reading circuit 200 from the bias voltage circuit 210, so the image will still have column noise due to random noise in other external potentials
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[0032] The term "coupled" used throughout the specification of this case (including the patent claims) may refer to any direct or indirect means of connection. For example, if it is described in the text that a first device is coupled to a second device, it should be interpreted as that the first device can be directly connected to the second device, or the first device can be connected through other devices or some kind of connection means. indirectly connected to the second device.
[0033] Please refer to Figure 4 , Figure 4 It is a schematic diagram of a part of the circuit of the image sensor 60 in the first embodiment. Such as Figure 4 As shown, the image sensor 60 includes a pixel unit 600 and a pixel reading circuit 602 , the pixel unit 600 includes an image pixel array 604 , a reference pixel array 606 and a bias circuit 608 . The image sensor 60 is partially similar to the image sensors 10 - 50 described above, so components and signals with the same functions...
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The invention discloses an image sensor comprising a pixel unit and a pixel reading circuit. The pixel unit comprises an image pixel array, a first reference pixel array, and a bias circuit. The image pixel array comprises multiple image pixel rows. The first reference pixel array comprises multiple first reference pixel rows. The bias circuit is coupled to the multiple image pixel rows to generate multiple row sensing signals, is coupled to the multiple first reference pixel rows to generate multiple first reference signals, and generates a first average reference voltage signal according to the multiple first reference signals. The pixel reading circuit generates multiple reset values and multiple sample values according to the multiple row sensing signals and the first average reference voltage signal. The number of multiple first reference pixel columns is less than that of multiple image pixel columns.
Description
technical field [0001] The present invention relates to an image sensor, in particular to a method that can share one or more reference pixel columns to eliminate column noise of different image pixel columns, so as to reduce the reference pixel area and avoid reducing the frame rate (frame rate) when eliminating column noise in digital form. rate), or an image sensor that avoids additional noise and reduces circuit area when removing column noise in analog form. Background technique [0002] Generally speaking, in an image sensor, a pixel reading circuit, such as a correlated double sampler (correlation double sampling, CDS), reads the image pixel column by column to generate a reset value and a sample value, so When reading different image pixel rows, if external potentials such as system voltage, ground potential, and bias reference voltage are disturbed by random noise, even if the patterns of different image pixel rows are actually the same, the pixel reading circuit wi...
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IPC IPC(8): H04N5/357
Inventor 温文燊孟昭宇
Owner NOVATEK MICROELECTRONICS CORP