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Circuit and method for shortening pixel output stabilization time

An output stability and time technology, applied in the field of image sensors, can solve the problems of reducing the dynamic range of pixels, reducing the output voltage of pixels, affecting the dynamic range of the chip, etc., to shorten the stabilization time, increase the output frame rate, and shorten the required time.

Active Publication Date: 2022-04-05
四川创安微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the method of reducing the stabilization time of the pixel is mostly to increase the pixel supply current, but this will increase the power consumption of the chip, and at the same time increase the difference between the middle and both ends of the pixel, resulting in a decrease in image quality
And this will also reduce the output voltage of the pixel, and the lower the output voltage of the pixel, the smaller the range of the effective pixel signal, which will also reduce the dynamic range of the pixel, thus affecting the dynamic range of the chip

Method used

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  • Circuit and method for shortening pixel output stabilization time

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Embodiment 1

[0036]This embodiment discloses a circuit for shortening the pixel output stabilization time. The circuit includes a drive unit (1), a load unit (N) and a pixel unit (M rows and N columns); the pixel unit is composed of a pixel matrix with M rows and N columns ; Each row of pixels corresponds to a load unit (N load units); as figure 1 As shown, each load unit includes a first MOS transistor 5 and a second MOS transistor 6, and the first MOS transistor 5 is used to cut off the tail current provided by the pixel unit during the period of electronic reading of the third MOS transistor 1 Signal; the second MOS transistor 6 is used to control the load MOS transistor 7 to work normally during the period of electronic reading of the third MOS transistor 1 .

[0037] The load unit set in this embodiment can provide a stable tail current for the pixel unit by controlling the phase relationship of the control signals of the first MOS transistor 5, the second MOS transistor 6, the fourth...

Embodiment 2

[0048] This embodiment discloses a method for shortening the pixel output stabilization time. This embodiment is to realize the circuit for shortening the pixel output stabilization time provided in Embodiment 1. The method steps include:

[0049] By closing the fourth MOS transistor 2 and the first MOS transistor 5, the tail current signal of the pixel unit is cut off, and under the control of the second MOS transistor 6, a voltage signal is provided to the load MOS transistor 7;

[0050] Applying a voltage signal to the third MOS transistor 1, and reading the pixel signal in the pixel unit;

[0051] After the pixel signal reading is completed, stop the voltage signal applied to the third MOS transistor 1;

[0052] And turn on the fourth MOS transistor 2 and the first MOS transistor 5 to provide the tail current signal to the pixel unit, and cut off the voltage signal provided to the load unit under the control of the second MOS transistor 6 .

[0053] exist figure 1 The si...

Embodiment 3

[0058] This embodiment discloses an image sensor, including a pixel array; the pixel array includes a number of circuits for shortening the pixel output stabilization time as in Embodiment 1, and the circuits for shortening the pixel output stabilization time are uniform in the form of an array arranged.

[0059] In the image sensor provided in this embodiment, the other parts that make up the image sensor are the parts of the CMOS image sensor in the prior art, but the timing control circuit provided by the embodiment one is used in the part of the pixel array, which can make the image sensor It is faster and more stable when outputting image quality.

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Abstract

The invention discloses a circuit and method for shortening pixel output stabilization time, and belongs to the technical field of image sensing, load units provide tail current signals for pixel units, each pixel unit is composed of a pixel matrix with M rows and N columns, each column of pixels is correspondingly provided with one load unit, and a first MOS tube is used for electrically reading a third MOS tube within the time period of electronically reading the third MOS tube. Cutting off a tail current signal provided for the pixel unit; the second MOS tube is used for controlling the load MOS tube to work normally in the time period of electronically reading the third MOS tube; the pixel driving circuit has the beneficial effects that under the condition that pixel supply current is not increased, the capacitive coupling influence quantity on the grid voltage of the eighth MOS tube is reduced to the minimum, the dynamic range of pixel output can be ensured, and the quality of an output image is ensured; and moreover, the time required for stable pixel output is greatly shortened, the time of one reading period is shortened, the output frame rate of the sensor is increased, and the definition of image quality is improved.

Description

technical field [0001] The invention relates to the technical field of image sensors, in particular to a circuit and a method for shortening pixel output stabilization time. Background technique [0002] In a general CIS image sensor, the load current source provides the tail current for the pixel, and then the pixel output is compared with the reference signal by the comparator, and then counted by the counter to obtain the effective signal amount and complete the analog-to-digital conversion. As consumers have higher and higher requirements for the number of picture frames, higher requirements are also put forward for CIS chip design. How to complete a pixel readout in a shorter effective time has become a major design problem. [0003] In a complete pixel readout, it is divided into the pixel RST readout period and the pixel effective signal readout period. The pixel RST readout period is further divided into the comparator RST period, the pixel signal stabilization perio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/228H04N5/232H04N23/40
CPCY02D10/00
Inventor 不公告发明人
Owner 四川创安微电子有限公司
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