CN112689073A

CN112689073A - Image sensor, camera module and electronic equipment

Info

Publication number: CN112689073A
Application number: CN202011586821.XA
Authority: CN
Inventors: 李沛德; 何振球
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-20
Anticipated expiration: 2040-12-28
Also published as: CN112689073B

Abstract

The application discloses image sensor, module and electronic equipment make a video recording, this image sensor includes a plurality of pixel, the pixel includes: the light-sensitive components comprise light-sensitive elements, a first switch and a light filter corresponding to the sensed colors, the light-sensitive elements and the first switch are connected in series between a signal end and a grounding end, and a light-emitting surface of the light filter faces the light-sensitive elements; and the electric energy storage circuit comprises a capacitor, and is connected between the signal end and the grounding end. The structure of the image sensor is beneficial to improving the quality of the collected image.

Description

Image sensor, camera module and electronic equipment

Technical Field

The application belongs to the technical field of photoelectricity, concretely relates to image sensor, camera module and electronic equipment.

Background

An image sensor is a device that converts an optical signal into an electrical signal. The image sensor includes a plurality of pixel units, each of which has a photosensitive element and a color filter, and the pixel units are arranged in a Bayer (Bayer) array, for example. Here, since the filter of each pixel unit allows only a single color of light to pass through and be received by the photosensitive element, the single pixel unit can acquire only one color of light signals of Red (Red, R), Green (Green, G) and Blue (Blue, B) and convert the light signals into electric signals to be output, which makes the resolution of each color image low, for example, the G image resolution is 1/2 and the R and B images resolution is only 1/4 according to the arrangement of the bayer array. For the image sensor, algorithms such as single-frame interpolation, multi-frame synthesis and the like are adopted to improve the resolution of each color image, so that the image definition is improved.

For the single-frame interpolation algorithm, because the number of real pixel units of the image sensor is not increased, the single-frame interpolation algorithm has a limited space for improving the image definition, and interpolation errors can even occur in a scene with shooting details. For a multi-frame synthesis algorithm, a typical implementation manner is a pixel displacement technique, that is, the image sensor is respectively moved by one pixel in the circumferential direction, an image is acquired once every movement, and finally the acquired multi-frame images are synthesized into one frame of image to be output, so as to achieve the purpose of improving the resolution. Here, since the multi-frame synthesis algorithm needs to move the image sensor by a distance of exactly one pixel each time, and needs to expose multiple times, and then align and synthesize the images of multiple frames, it is difficult to ensure the quality of the processed images due to the high difficulty in position control and image processing. Therefore, for the existing image sensor, it is difficult to improve the image quality through these algorithms, and the accuracy is poor, so a new image sensor structure beneficial to improving the image quality is needed to be provided.

Disclosure of Invention

The present application is directed to an image sensor, a camera module and an electronic device, which solve at least one of the problems mentioned in the background.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides an image sensor, which includes a plurality of pixel units, where each pixel unit includes:

the light-sensitive components comprise light-sensitive elements, a first switch and a light filter corresponding to the sensed colors, the light-sensitive elements and the first switch are connected in series between a signal end and a grounding end, and a light-emitting surface of the light filter faces the light-sensitive elements; and the number of the first and second groups,

an electrical energy storage circuit comprising a capacitor, the electrical energy storage circuit connected between the signal terminal and the ground terminal.

In a second aspect, an embodiment of the present application provides a camera module, which includes:

a circuit board;

an image sensor electrically connected to the circuit board, the image sensor being the image sensor according to the second aspect; and the number of the first and second groups,

the lens is arranged on one side, far away from the circuit board, of the image sensor.

In a third aspect, an embodiment of the present application provides an electronic device, which includes the camera module according to the second aspect.

In the embodiment of the application, image sensor's pixel unit includes two kinds at least photosensitive assembly, heterogeneous photosensitive assembly corresponds different response colours, promptly, every kind photosensitive assembly has the response colour that corresponds separately, heterogeneous photosensitive assembly can respond to the light of different colours, therefore, the image sensor of this embodiment is through once exposing, can absorb the light energy of corresponding colour through the photosensitive assembly of the different response colours of correspondence of each pixel unit, in order to convert this light energy into the electric energy, and through the control to first switch, the electric energy that each photosensitive assembly conversion obtained is shifted to the electric energy storage circuit and is stored in the timesharing, in order to supply to read, and then accomplish the conversion of light signal to the signal of telecommunication. Because the image sensor of this embodiment is exposed once, alright let every pixel cell obtain the light energy of two at least colours, this is equivalent to increased image sensor's pixel cell's quantity, consequently, utilize the image sensor of this embodiment to carry out image acquisition, will effectively promote the resolution ratio of each colour image, and then improve image quality.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an image sensor according to an embodiment of the present invention;

FIG. 2 is a schematic top view of the pixel unit shown in FIG. 1;

3 FIG. 3 3 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 the 3 pixel 3 cell 3 of 3 FIG. 3 2 3; 3

FIG. 4 is a schematic circuit diagram of the pixel unit shown in FIG. 1;

fig. 5 is a schematic diagram illustrating an arrangement structure of pixel units of an image sensor according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a camera module according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Reference numerals:

10. 610-an image sensor; 11. 11a, 11b, 11 c-pixel cells; 111a, 111b, 111 c-photosensitive elements; 1111-a photosensitive element; 1112-an optical filter; 1113-spectroscope; 1114 — a first switch; 112-electrical energy storage circuitry; 1121-capacitance; 1122-a second switch; vs-signal terminal; VDD-power supply terminal; GND-ground; RST-reset switch; SF-source follower; SET-select switch; vout-signal output terminal; 600-a camera module; 620-lens; 630-a circuit board; 640-an optical filter; 650-a motor; 660-a base; 670-a protective film; 700-electronic device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. Further, "and/or" in the specification and claims means at least one of the connected objects.

In the description of the present invention, it is to be understood that the terms "center", "row direction", "column direction", "upper", "lower", "outer periphery", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment of the invention relates to an image sensor which is used as a component of a camera module and used for sensing optical signals and converting the optical signals into electric signals to be output so as to form image data.

The structure of an image sensor according to an embodiment of the present invention is described below with reference to fig. 1 to 4.

As shown in fig. 1, an image sensor 10 according to some embodiments of the present invention includes a plurality of pixel units 11. These pixel cells 11 are arranged in accordance with a set rule to form a pixel array. In this embodiment, one pixel unit 11 of the image sensor 10 corresponds to one pixel point of the acquired image.

The basic structure of a pixel unit 11 of the image sensor 10 will be described with reference to fig. 2 to 3 by taking the pixel unit 11 as an example.

As shown in fig. 2 and fig. 3, the pixel unit 11 includes at least two kinds of photosensitive elements, and the photosensitive elements of different kinds correspond to different sensing colors, that is, the photosensitive elements of different kinds can sense light of different colors, so that the single pixel unit 11 can receive light signals of multiple colors after one exposure, and the improvement of the image resolution by the structure is equivalent to the number of the actually increased pixel units, thereby effectively improving the image quality.

For example, as shown in fig. 2, the pixel unit 11 includes three photosensitive elements, which are a photosensitive element 111a, a photosensitive element 111b and a photosensitive element 111c, wherein the sensing color corresponding to the photosensitive element 111a is red, the sensing color corresponding to the photosensitive element 111b is green, and the sensing color corresponding to the photosensitive element 111c is blue. Therefore, the pixel unit 11 can receive light signals of three colors of RGB through one exposure. Thus, the single pixel unit 11 in this embodiment can function as a red pixel unit, a green pixel unit, and a blue pixel unit in the prior art, thereby improving the resolution of images with different colors and being beneficial to improving the image quality.

In another embodiment, the pixel unit 11 may also have two kinds of photosensitive elements, and may also have a greater variety of photosensitive elements, for example, the sensing colors corresponding to these photosensitive elements are not limited to red, green and blue, and may also correspond to other sensing colors, such as purple, and the like, and are not limited herein.

In this embodiment, the plurality of pixel units 11 of the image sensor 10 may have the same pixel structure, or may have at least two pixel structures, where the pixel structure includes at least one of the composition of the photosensitive elements of the pixel units 11, the ratio of the photosensitive areas of the photosensitive elements, and the arrangement structure of the photosensitive elements, and is not limited herein.

For example, referring to fig. 1, the plurality of pixel units 11 of the image sensor 10 have three different pixel structures, namely a first pixel structure 11a, a second pixel structure 11b and a third pixel structure 11c, which may have the same photosensitive element composition, for example, all include a photosensitive element 111a, a photosensitive element 111b and a photosensitive element 111c, but the ratio of the photosensitive areas of the photosensitive elements of the three pixel structures and the arrangement structure of the photosensitive elements are different.

In some embodiments, as shown in fig. 5, two adjacent pixel units 11 of the image sensor 10 may have different pixel structures, wherein the two adjacent pixel units include at least one of two pixel units 11 adjacent in a row direction and two pixel units 11 adjacent in a column direction.

The basic structure of the photosensitive element is described below with reference to fig. 3 and 4, taking a

photosensitive element

111a, 111b, or 111c of the pixel unit 11 as an example.

As shown in fig. 3 and 4, the photosensitive assembly includes a photosensitive element 1111, a first switch 1114 and a filter 1112 corresponding to the sensed color. The light sensing element 1111 and the first switch 1114 are connected in series between the signal terminal Vs and the ground terminal GND. The light-emitting surface of the optical filter 1112 faces the photosensitive element 1111, so that light transmitted through the optical filter 1112 can be incident on the photosensitive element 1111, and conversion from an optical signal to an electrical signal is realized.

Taking the pixel unit 11 including three types of

photosensitive elements

111a, 111b, and 111c as an example, as shown in fig. 4, the photosensitive circuits of the three types of photosensitive elements are connected in parallel between the signal terminal Vs and the ground terminal GND, wherein the photosensitive circuit includes the photosensitive element 1111 and the first switch 1114 connected in series.

The photosensitive element 1111 may be, for example, a photodiode.

In some embodiments, as shown in fig. 3, the photosensitive area of the photosensitive element 111a of one sensing color of the pixel unit 11 is different from the photosensitive area of the photosensitive elements of the other sensing colors of the same pixel unit 11. This may enable the same pixel cell 11 to have different sensing capabilities for different colors of light, which may result in an image more consistent with visual characteristics as desired.

In this embodiment, the larger the photosensitive area of a photosensitive element is, the larger the ratio of the photosensitive area of the photosensitive element 1111 and the area of the corresponding filter 1112 in the pixel unit 11 is.

In some embodiments, the photosensitive area of the photosensitive element for one sensed color is greater than or equal to the sum of the photosensitive areas of the photosensitive elements for the other sensed colors. In this embodiment, the photosensitive areas of the photosensitive elements of the other sensing colors may be the same or different, and are not limited herein.

As shown in fig. 5, for example, for the pixel unit 11a, the red photosensitive element may be provided with a larger photosensitive area, and the green photosensitive element and the blue photosensitive element may be provided with a smaller photosensitive area, which may be that the photosensitive area of the red photosensitive element is larger than the sum of the photosensitive areas of the green photosensitive element and the blue photosensitive element. For another example, for the pixel unit 11b, the green photosensitive element may be provided with a larger photosensitive area, and the red photosensitive element and the blue photosensitive element may be provided with a smaller photosensitive area, which may be that the photosensitive area of the green photosensitive element is larger than the sum of the photosensitive areas of the red photosensitive element and the blue photosensitive element. For example, for the pixel unit 11c, the blue photosensitive element may be set to have a larger photosensitive area, and the red photosensitive element and the green photosensitive element may be set to have a smaller photosensitive area, which may be that the photosensitive area of the blue photosensitive element is larger than the sum of the photosensitive areas of the green photosensitive element and the red photosensitive element.

In some embodiments, as shown in fig. 5, for a pixel unit 11, the photosensitive elements of other sensing colors may be distributed on the periphery of the photosensitive element of one sensing color, relative to the photosensitive element of one sensing color having a larger photosensitive area. For example, at the corners of such a color-sensitive element.

As shown in fig. 5, for example, for the pixel unit 11a, the green photosensitive member and the blue photosensitive member are disposed at opposite corners of the red photosensitive member. For another example, for the pixel cell 11b, the red photosensitive member and the blue photosensitive member may be disposed at opposite corners of the green photosensitive member. For the pixel unit 11c, for example, the red photosensitive member and the green photosensitive member may be disposed at opposite corners of the blue photosensitive member, or the like.

In some embodiments, as shown in fig. 4, the

photosensitive elements

111a, 111b, and 111c may further include a beam splitter 1113, and the beam splitter 1113 may converge the light, so that the light is projected onto the corresponding optical filter 1112, thereby increasing the light energy incident on the

photosensitive elements

111a, 111b, and 111 c.

As shown in fig. 4, the pixel unit 11 may further include an electric energy storage circuit 112, and the electric energy storage circuit 112 is also connected between the signal terminal Vs and the ground terminal GND. The power storage circuit 112 includes a capacitor 1121, and the capacitor 1121 can store the power released by the photosensitive element 1111 for reading.

In this embodiment, taking a pixel unit 11 of the image sensor 10 as an example, all the photosensitive elements of the pixel unit 11 are exposed once to obtain light energy of a sensed color, and the light energy is converted into electric energy to be stored in the respective photosensitive elements 1111, when the pixel unit 11 is selected to read an electric signal of the pixel unit, the first switches 1114 of the

photosensitive elements

111a, 111b, and 111c can be controlled to be turned on in a time-sharing manner, so that the corresponding

photosensitive elements

111a, 111b, and 111c release the electric energy to the electric energy storage circuit 112 for storage, so as to be read.

For example, in the case that the image sensor completes one exposure and selects to read the pixel unit, the pixel unit 11 may first control the first switch 1114 connected in series with the photosensitive element 111a to be turned on, and keep the first switch 1114 connected in series with the photosensitive element 111b and the first switch 1114 connected in series with the photosensitive element 111c to be turned off, at which time, the electric energy obtained by converting the red light energy by the photosensitive element 111a may be transferred to the electric energy storage circuit 112 for reading. After the photosensitive element 111a is read, the first switch 1114 connected in series with the photosensitive element 111b can be controlled to be turned on, and the first switch 1114 connected in series with the photosensitive element 111a and the first switch 1114 connected in series with the photosensitive element 111c are kept in an off state, at this time, the electric energy obtained by converting the green light energy by the photosensitive element 111b can be transferred to the electric energy storage circuit 112 for reading. After the photosensitive element 111b is read, the first switch 1114 connected in series with the photosensitive element 111c is controlled to be turned on, and the first switch 1114 connected in series with the photosensitive element 111a and the first switch 1114 connected in series with the photosensitive element 111b are kept in an off state, at this time, the electric energy obtained by converting the blue light energy by the photosensitive element 111c can be transferred to the electric energy storage circuit 112 for reading. Through the above processes, the reading of the pixel unit 11 can be completed in a time-sharing manner, so that a multi-frame image can be obtained by time-sharing reading of all the pixel units of the image sensor, that is, the image sensor can output multi-frame images with different or same exposure values through one-time exposure, and a high-quality image can be obtained by performing synthesis, multi-frame noise reduction and the like on the obtained multi-frame images.

Therefore, the image sensor 10 of the present embodiment can allow each pixel unit 11 to obtain light energy of at least two colors after one exposure, which is equivalent to increasing the number of pixel units of the image sensor, so that the resolution of each color image can be effectively improved by using the image sensor of the present embodiment to perform image acquisition, thereby improving the image quality.

In some embodiments, taking the power storage circuit 112 of a pixel unit 11 as an example, the power storage circuit 112 may include a capacitor 1121.

In other embodiments, as shown in fig. 4, the electrical energy storage circuit 112 may also include at least two capacitors 1121, and the at least two capacitors 1121 are connected in parallel between the signal terminal Vs and the ground terminal GND.

In an embodiment where the electrical energy storage circuit 112 includes at least two capacitors 1121, the electrical energy storage circuit 112 further includes second switches 1122 corresponding to at least some of the at least two capacitors, wherein, as shown in fig. 4, at least some of the capacitors 1121 and the corresponding second switches 1122 are connected in series between the signal terminal Vs and the ground terminal GND. In this way, by controlling the on/off state of each second switch 1122 in the electric energy storage circuit 112, the electric energy storage circuit 112 can have different capacitive reactance values, which are different, and the values of the electric signals output by the electric energy storage circuit 112 are different, which means that for the pixel unit 11, even for the same

photosensitive component

111a, 111b or 111c of the pixel unit 11, different electric signals can be obtained, so as to obtain images of more frames reflecting the same shooting scene, which can further improve the quality of the synthesized image.

In this embodiment, one of the at least two capacitors 1121 may not have the corresponding second switch 1122, that is, the capacitor 1121 is directly connected between the signal terminal Vs and the ground terminal GND, and the other capacitors are all configured with the corresponding second switches 1122, so that the electric energy storage circuit 112 can exhibit different capacitive reactance values by controlling the on/off of the second switches 1122.

For example, as shown in fig. 4, the power storage circuit 112 of the pixel unit 11 has three capacitors 1121, wherein one capacitor 1121 does not have a corresponding second switch, and the other two capacitors 1121 are respectively connected in series with the corresponding second switches 1122 between the signal terminal Vs and the ground terminal GND, so that the power storage circuit 112 can exhibit three different capacitive reactance values by controlling the on-off states of the two second switches 1122 even though the capacitive reactance values of the three capacitors 1121 are the same.

As shown in fig. 4, taking the electrical signal converted by the photosensitive element 111a of the reading pixel unit 11 as an example, when the photosensitive element 111a is read, the first switch 1114 connected in series with the photosensitive element 111a is controlled to be turned on, and keeps the first switch 1114 in series with the photosensitive element 111b and the first switch 1114 in series with the photosensitive element 111c in an off state, at this time, in the case where both second switches 1122 are first controlled to be open, or off, the electrical energy storage circuit 112 appears to have a first capacitive reactance value, and outputs an electrical signal corresponding to the first capacitive reactance value, and then controls one of the second switches 1122 to be turned on and the two switches 1122 to be turned off, so that the electrical energy storage circuit 112 exhibits the second capacitive reactance value, and outputs an electrical signal corresponding to the second capacitive reactance value, and finally controls the two second switches 1122 to be turned on, so that the electrical energy storage circuit 112 exhibits a third capacitive reactance value and outputs an electrical signal corresponding to the third capacitive reactance value. Thus, for the photosensitive element 111a, three frames of images can be obtained, and each pixel unit 11 has three

photosensitive elements

111a, 111b, and 111c, so that for the image sensor 10 of the present embodiment, nine frames of images can be obtained by one exposure for synthesis, noise reduction, and the like, thereby effectively improving the quality of the finally obtained images.

In some embodiments, for the same pixel unit 11, in order to facilitate time-sharing reading of the electrical signals converted by the different

photosensitive assemblies

111a, 111b, and 111c, as shown in fig. 4, the pixel unit 11 may further include a reset switch RST connected between the power terminal VDD and the signal terminal Vs. In this embodiment, the reset switch RST is turned off to read one of the photosensitive elements of the pixel unit 11, and then the reset switch RST is turned on after the photosensitive element is read, so that the pixel unit 11 can be reset, and when the reset switch RST is turned off again, another photosensitive element can be read until the reading operation of all the photosensitive elements of the pixel unit 11 is completed.

In some embodiments, as shown in fig. 4, the pixel unit 11 may further include a source follower SF having a gate connected to the signal terminal Vs, a drain connected to the power supply terminal VDD, and a selection switch SET connected between the source of the source follower SF and the output terminal Vout of the pixel unit 11. In this embodiment, the source follower SF may amplify the electrical signal of the signal end Vs, so as to improve the signal acquisition precision. In this embodiment, the selection switch SET may select the pixel unit 11 scanned each time when the image sensor 10 is scanned, and the selection switch SET may be a row selection switch or a column selection switch as needed, which is not limited herein.

The switches in the above embodiments, including the first switch 1114, the second switch 1122, the selection switch SET, the source follower SF, etc., may be Complementary Metal Oxide Semiconductor (CMOS) switches, or may be other types of switches, which is not limited herein.

As shown in fig. 6, an embodiment of the present invention further provides a camera module 600, where the camera module 600 includes an image sensor 610, the image sensor 610 may be the image sensor 10 of any of the above embodiments, the camera module 600 further includes a lens 620 and a circuit board 630, the image sensor 610 is electrically connected to the circuit board 630, and a digital signal processor, an analog-to-digital converter and the like may be disposed on the circuit board 630, so as to convert an analog electrical signal output by the image sensor 610 into a digital signal through the analog-to-digital converter, and output the digital signal to the digital signal processor for signal processing, thereby obtaining image data. The lens 620 is disposed on a side of the image sensor 610 away from the circuit board 630, i.e., the light incident surface of the image sensor 610 faces the lens 620.

In order to improve the shooting performance of the camera module 600, the camera module 600 may further include an optical filter 640, where the optical filter 640 is disposed between the image sensor 610 and the lens 620, and is used for filtering out invisible infrared light and the like of human eyes when shooting in the daytime, so as to improve the effective resolution of the collected image and the reducibility of the collected image to colors, and further improve the quality of the collected image.

In some embodiments, the camera module 600 may further include a motor 650, wherein the motor 650 is connected to the lens 620 for driving the lens 620 to move.

The camera module 600 can drive the lens 620 to move by controlling the motor 650, so as to realize automatic zooming.

In some embodiments, the camera module 600 may further include a base 660 for mounting the motor 650, so as to facilitate mounting of the motor 650.

In some embodiments, the camera module 600 may further include a protective film 670 disposed on the lens 620 to protect the lens 620 from damage.

For the image capturing module 600 of this embodiment, since the image sensor 610 disposed therein is exposed once, each pixel unit 11 can obtain light energy of at least two colors, which is equivalent to increasing the number of pixel units of the image sensor, so that the image capturing module 600 of this embodiment is used to capture an image, which can effectively improve the resolution of each color image, and further improve the quality of the captured image.

As shown in fig. 7, an embodiment of the present invention further provides an electronic device 700 including the camera module 600 according to any of the above embodiments.

For example, the electronic device 700 may include a housing having a light-transmissive portion. The camera module 600 may be disposed in the electronic device housing, and the lens 610 of the camera module 600 faces the light-transmitting portion, so that image capturing can be performed through the light-transmitting portion.

The electronic device may be any device having a camera function, for example, a mobile phone, a tablet computer, a notebook computer, a wearable device, and the like, which is not limited herein.

The foregoing embodiments have focused on the differences between corresponding and other embodiments, and reference may be made to the same or similar components in each embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An image sensor comprising a plurality of pixel cells, the pixel cells comprising:

2. The image sensor of claim 1, wherein the power storage circuit comprises at least two capacitors connected in parallel between the signal terminal and the ground terminal, and further comprising second switches in one-to-one correspondence with at least some of the at least two capacitors, wherein the at least some capacitors and the corresponding second switches are connected in series between the signal terminal and the ground terminal.

3. The image sensor of claim 1, wherein the pixel unit comprises three photosensitive elements, and the three photosensitive elements respectively have red, green and blue sensing colors.

4. The image sensor as claimed in any one of claims 1 to 3, wherein the photosensitive area of the photosensitive element of one sensed color of the pixel unit is different from the photosensitive area of the photosensitive elements of the other sensed colors.

5. The image sensor of claim 4, wherein the photosensitive area of the photosensitive element of one sensed color is greater than or equal to the sum of the photosensitive areas of the photosensitive elements of the other sensed colors.

6. The image sensor of claim 4, wherein the photosensitive elements of the other sensing colors are distributed around the periphery of the photosensitive element of the one sensing color.

7. The image sensor according to any one of claims 1 to 3, wherein two adjacent pixel units of the image sensor have different pixel structures, wherein the two adjacent pixel units include at least one of two pixel units adjacent in a row direction and two pixel units adjacent in a column direction.

8. The image sensor according to any one of claims 1 to 3, wherein the pixel unit further comprises a reset switch connected between a power supply terminal and a signal terminal.

9. The image sensor according to any one of claims 1 to 3, wherein the pixel unit further comprises a source follower whose gate is connected to the signal terminal and whose drain is connected to a power supply terminal, and a selection switch connected between the source of the source follower and an output terminal of the image sensor.

10. The utility model provides a module of making a video recording which characterized in that includes:

a circuit board;

an image sensor electrically connected to the circuit board, the image sensor being according to any one of claims 1-9; and the number of the first and second groups,

11. An electronic apparatus characterized by comprising the camera module according to claim 10.