HDR image sensor with gain compensation, readout circuit and method
An image sensor and gain compensation technology, which is applied in the field of readout circuit and image sensor, can solve problems such as time difference, smearing, and large reading noise of the circuit, and achieve the effects of increasing dynamic range, improving performance, and low analog power consumption
Active Publication Date: 2018-12-18
思特威(上海)电子科技股份有限公司
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In the high dynamic range implementation method of multi-frame synthesis, there is a time difference in the multi-frame reading process, and there will be tailing in the final synthesized image, and the reading noise of the circuit is large
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[0042] The content proposed by the present invention will be described in detail below in conjunction with each accompanying drawing given to this patent. figure 1 It is the basic structural block diagram of the image sensor system, such as figure 1 As shown in , the image sensor 100 includes a readout circuit 102 and a control circuit 104 connected to the pixel array 101, and a functional logic unit 103 is connected to the readout circuit 102 to perform logic control on the reading of the pixel circuit; the readout circuit 102 and the control circuit The circuit 104 is connected to the status register 105 to realize the read control of the pixel array 101 . The pixel array 101 includes a plurality of pixel units in rows (R1, R2, R3 . . . Ry) and columns (C1, C2, C3 . In one embodiment, after each pixel unit acquires image data, the image data is read out by the readout circuit 102 in the readout mode specified by the state register 105 , and then transmitted to the functiona...
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The invention provides an HDR image sensor with gain compensation, comprising a pixel array, a control circuit and a readout circuit. The control circuit sequentially reads a reset signal of a low conversion gain, a reset signal of a high conversion gain, an image signal of a high conversion gain and an image signal of a low conversion gain output from the pixel array according to control. The readout circuit comprises a selection switch, a low conversion gain analog-to-digital conversion circuit and a high conversion gain analog-to-digital conversion circuit. A switch is selected to control the pixel output of the half-line read pixel array of the readout circuit and the switching of the low conversion gain analog-to-digital conversion circuit and the high conversion gain analog-to-digital conversion circuit; A low conversion gain analog-to-digital conversion circuit is used for quantizing the reset signal and the image signal output at the low conversion gain; a high conversion gainanalog-to-digital conversion circuit is used for quantizing the reset signal and the image signal output at the high conversion gain. The invention also provides an HDR image sensor readout circuit with gain compensation and an implementation method thereof.
Description
technical field [0001] The invention relates to the technical field of CMOS image sensors, in particular to an image sensor with gain compensation and high dynamic range, a readout circuit and a realization method. Background technique [0002] Dynamic range is a key factor in the imaging quality of an image sensor. A large dynamic range can output scene image information in a wider range of light intensity, presenting richer image details. Normally, the dynamic range output by the image sensor is about 60-70db. In general natural environment applications, the dynamic range required to simultaneously capture the image information of the highlight and shadow parts is about 100db. In image sensor design, there are several ways to improve the dynamic range, such as further increasing the full well charge capacity of the pixel circuit to obtain a larger dynamic range; or by reading multiple frames of images for multi-frame synthesis. Enables image sensor high dynamic range (HDR...
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Login to View More IPC IPC(8): H04N5/378H04N5/369
CPCH04N25/70H04N25/75
Inventor 侯金剑莫要武徐辰任冠京
Owner 思特威(上海)电子科技股份有限公司