WO2023179589A1

WO2023179589A1 - Camera module and electronic device

Info

Publication number: WO2023179589A1
Application number: PCT/CN2023/082707
Authority: WO
Inventors: 黄长峰
Original assignee: 维沃移动通信有限公司
Priority date: 2022-03-22
Filing date: 2023-03-21
Publication date: 2023-09-28
Also published as: CN114650359A

Abstract

Disclosed in embodiments of the present application are a camera module and an electronic device. The camera module comprises a pixel unit and an adjustable spectral filter; the pixel unit comprises a plurality of photosensitive layers which are stacked, and each photosensitive layer is used for receiving light in a waveband corresponding to the photosensitive layer; the adjustable spectral filter is provided opposite to the pixel unit; the adjustable spectral filter can be switched between a first state and a second state; when the adjustable spectral filter is in the first state, first waveband light can be transmitted, and second waveband light is cut off, and a photosensitive layer in a waveband corresponding to the first waveband light generates a first photosensitive electrical signal after receiving the first waveband light; when the adjustable spectral filter is in the second state, the second waveband light can be transmitted, and the first waveband light is cut off, and a photosensitive layer in a waveband corresponding to the second waveband light generates a second photosensitive electrical signal after receiving the second waveband light.

Description

Camera modules and electronic equipment

Cross-references to related applications

This application claims priority to Chinese patent application 202210292242.7 filed in China on March 22, 2022, the entire content of which is incorporated herein by reference.

Technical field

This application belongs to the technical field of terminal equipment, and specifically relates to a camera module and electronic equipment.

Background technique

With the development trend of thinner and lighter smart mobile terminals, the size of the photosensitive chip in the camera module is subject to certain restrictions. The two points of large number of pixel units and large area of a single pixel unit are incompatible.

In related technologies, under the condition that the size of the photosensitive chip is limited, to achieve higher resolution, it is necessary to increase the number of pixel units, but this will reduce the size of a single pixel unit, which may result in poor photosensitive performance. Reduced, affecting image quality. In existing camera modules, in order to prevent infrared light from causing the visible light image to appear reddish, an IR filter is usually required to completely filter out the infrared light. The camera module can only image under the visible light spectrum. The imaging function is relatively simple.

Contents of the invention

This application aims to provide a camera module and electronic equipment to solve the problems of poor imaging quality and single imaging function of existing camera modules.

In the first aspect, embodiments of the present application provide a camera module. The camera module includes:

A pixel unit, the pixel unit includes a plurality of stacked photosensitive layers, each of the photosensitive layers is used to receive light in a wavelength band corresponding to the photosensitive layer; and

An adjustable spectrum filter, the adjustable spectrum filter is arranged opposite to the pixel unit;

The tunable spectral filter is switchable between a first state and a second state;

When the tunable spectrum filter is in the first state, it can transmit the first waveband light and cut off the second waveband light. The photosensitive layer corresponding to the first waveband light receives the first waveband light. After the light is emitted, the first photosensitive electrical signal is generated;

When the tunable spectrum filter is in the second state, it can transmit light in the second waveband and cut off light in the first waveband. The photosensitive layer corresponding to the second waveband light receives the second waveband light. After the light is emitted, a second photosensitive electrical signal is generated.

In a second aspect, embodiments of the present application provide an electronic device. The electronic device includes the camera module as described above.

In the embodiment of the present application, by using a photosensitive stack structure as a pixel unit for photosensitivity and using an adjustable spectrum filter, multispectral imaging with high pixels and high photosensitivity performance is achieved on the camera module. ; The stacked pixel units can reduce the power consumption of the camera module to a certain extent and improve the resolution, and combined with the adjustable spectral filter can expand the application scope of the camera module.

Additional aspects and advantages of the application 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 application.

Description of the drawings

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

Figure 1 is a schematic structural diagram of a camera module provided according to an embodiment of the present application;

Figure 2 is a schematic diagram of the principle of the photosensitive layer of the camera module provided according to an embodiment of the present application;

Figure 3 is a schematic diagram of the spectral transmittance of the electrically tunable spectral filter of the camera module provided according to an embodiment of the present application;

Figure 4 is a schematic structural diagram of an embodiment of an electrically tunable spectral filter of a camera module provided according to an embodiment of the present application;

Figure 5 is one of the flow charts of the control method of the camera module provided according to the embodiment of the present application;

Figure 6 is the second flow chart of the control method of the camera module provided according to the embodiment of the present application;

Figure 7 is the third flow chart of the control method of the camera module provided according to the embodiment of the present application.

Detailed ways

Embodiments of the present application will be described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

The terms "first" and "second" features in the description and claims of this application may include one or more of these features, either explicitly or implicitly. In the description of this application, unless otherwise stated, "plurality" means two or more. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

In the description of this application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientation or positional relationship indicated by "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply the device or element to which it refers. Must have a specific orientation, be constructed and operate in a specific orientation and therefore should not be construed as a limitation on this application.

In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood on a case-by-case basis.

The camera module and electronic equipment provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios.

According to an embodiment of the present application, a camera module is provided, which can be applied to various forms of electronic equipment.

The camera module provided by the embodiment of the present application is, for example, a CMOS camera module (CMOS Camera Module, CCM), which is a camera module that is currently widely used in smart mobile terminal devices.

Of course, the camera modules provided by the embodiments of the present application include but are not limited to the above-mentioned CMOS camera module, and the embodiments of the present application are not limited here.

Refer to Figure 1 for the camera module provided by the embodiment of the present application. The camera module includes a pixel unit 1. The pixel unit 1 includes a plurality of photosensitive layers arranged in a stack. Each photosensitive layer can be used to receive light in a wavelength band corresponding to the photosensitive layer; The camera module also includes an adjustable spectrum filter 2, which is arranged opposite to the pixel unit 1;

The tunable spectral filter 2 is switchable between the first state and the second state;

When the tunable spectrum filter 2 is in the first state, it can transmit the first waveband light and cut off the second waveband light. After receiving the first waveband light, the photosensitive layer of the waveband corresponding to the first waveband light generates a third waveband light. One senses photoelectric signals;

When the tunable spectrum filter 2 is in the second state, it can transmit light of the second waveband and cut off the light of the first waveband. After receiving the light of the second waveband, the photosensitive layer of the waveband corresponding to the second waveband light generates a third waveband light. 2. Sensing photoelectric signals.

In the embodiment of the present application, the pixel unit 1 includes a plurality of photosensitive layers of different photosensitive colors (for example, red, green, blue, or RGB), and each photosensitive layer is stacked in sequence, forming a stack. The pixel structure design, see Figure 1.

The pixel unit 1 provided in the embodiment of the present application is a stacked pixel structure, which can utilize the principle that light of different wavelengths has different penetrating powers (the longer the wavelength, the greater the penetration depth, that is, the penetration depth is such as: red light>green light>blue light ), so that each pixel unit 1 can obtain the real light intensity of three wavelengths of light at the pixel unit at the same time. Therefore, when restoring the color information at the pixel unit, that is, when doing three-color synthesis, there is no need to perform algorithmic filtering and interpolation. It can reduce false colors and better show the true color information of the pixel unit. information, which can have better resolution compared to the conventional RGB pixel structure.

It can be understood that since the pixel unit 1 does not need to perform color difference, it can obtain more realistic colors and reduce the difference calculation, so the power consumption will be greatly reduced; on the other hand, the pixel unit 1 does not need to go through Algorithmic interpolation and analytical power will also be significantly improved.

In the embodiment of the present application, see Figure 2, which shows a schematic diagram of the internal circuit structure of the pixel unit 14T. It can be seen from Figure 2 that the pixel unit 1 includes three photosensitive areas, that is, a three-layer stacked pixel structure, and also includes four transistors. The four transistors are the reset tube RST, the switch TG, and the row selector SET. and signal amplifier SF.

In the embodiment of the present application, an adjustable spectrum filter 2 is also used, which is different from the infrared filter (IR Filter) used in traditional camera modules. The tunable spectrum filter 2 can adjust the type of filtered spectrum by controlling the voltage applied thereto, for example. That is, under different voltage controls, the tunable spectrum filter 2 is configured to transmit spectra of different wavelength bands. In this way, the types of imaging spectra can be expanded, and the shooting function of the camera module can be expanded.

For example, the first band of light is set to visible light (400nm~700nm), and the second band of light is set to infrared light (greater than 700nm). On this basis, by controlling the voltage applied to the adjustable spectrum filter 2, it can be achieved Allow visible light to pass through and infrared light to be cut off, or to cut off visible light and infrared light to pass through. This allows the camera module provided by the embodiment of the present application to have dual imaging functions of visible light imaging and infrared light imaging at the same time, and the user can flexibly select either of the two camera functions for imaging operations according to needs.

Referring to Figure 3, when the tunable spectrum filter 2 is in the first state, the transmittance of the visible light spectrum is high and the transmittance of the infrared spectrum is low. When the tunable spectrum filter 2 is in the second state, the transmittance of the visible light spectrum is low and the transmittance of the infrared spectrum is high.

When the camera module uses infrared spectrum imaging (that is, the tunable spectrum filter 2 allows infrared light to pass through and visible light to cut off), it can perform night vision, detect human body temperature, etc., and can achieve this through infrared imaging in cloud and fog environments. Imaging through clouds and fog.

In the embodiment of the present application, by adopting a photosensitive stack structure for the pixel unit 1 used for photosensitivity, and using an adjustable spectrum filter 2, high pixels and high photosensitivity are achieved on the camera module. High-performance multispectral imaging; the stacked pixel unit 1 can reduce the power consumption of the camera module to a certain extent and improve the resolution, and combined with the adjustable spectrum filter 2 can expand the application range of the camera module.

In some examples of this application, the camera module also includes an image processing device. The image processing device is electrically connected to the pixel unit 1. The image processing device is configured to perform at least one of the following functions based on different photosensitive electrical signals generated by the pixel unit:

Generate a first target image according to the first photosensitive electrical signal;

A second target image is generated according to the second photosensitive electrical signal.

That is to say, the camera module provided by the embodiment of the present application can have at least two different shooting modes, and can correspondingly generate two different images.

Among them, the image processing device may include, for example, an amplifier, an analog-to-digital converter (Analog-to-digital converter, ADC), an image signal processor (mage Signal Processing, ISP), etc. On this basis, the pixel unit 1 is electrically connected to an amplifier, a digital-to-analog converter and an image signal processor in sequence. The photosensitive electrical signal generated by the pixel unit 1 can be passed through an amplification circuit, an AD conversion circuit, etc. in sequence to form a digital signal matrix ( image).

For example, the user selects a first band of light spectrum imaging, and the first band of light is, for example, visible light. That is, in the visible light spectrum imaging mode, the tunable spectrum filter 2 is controlled to be in the first state, visible light can pass through the tunable spectrum filter 2, and the pixel unit 1 can receive light of different colors in the visible light for imaging. The light is sensed and processed by an analog-to-digital converter (ADC), and then image signal processing is performed by an image signal processor (ISP), and then a visible light spectrum imaging picture is output. Since the pixel unit 1 is designed as a stacked structure, it avoids the problem of conventional pixel plane structures occupying a large space; and, under the condition of having a large number of pixel units, each pixel unit can still have a large photosensitive area. At the same time, the stacked structure There is no need to perform filtering and interpolation during pixel synthesis and imaging, reducing false colors.

For example, the user selects a second waveband light spectrum for imaging, and the second waveband light is, for example, infrared light. That is, in the infrared spectrum imaging mode, the tunable spectrum filter 2 is controlled to be in the second state, infrared light can pass through the tunable spectrum filter 2, and the pixel unit 1 can directly receive the infrared light and perform imaging. The corresponding photosensitivity is processed by the analog-to-digital converter, and then the image signal processor performs image signal processing, and then outputs the infrared spectrum imaging picture. Similarly, the pixel unit 1 is a stacked structure, It avoids the problem of large space occupied by conventional pixel planar structures; and, with a large number of pixel units, each pixel unit can still have a large photosensitive area. At the same time, there is no need for filtering and interpolation during the stacked structure pixel synthesis imaging process. , reduce false colors.

For the camera module provided by the embodiment of the present application, when using the camera module, the user can flexibly select at least one of the visible light spectrum and the infrared light spectrum for imaging according to specific shooting needs.

In some examples of this application, the camera module also includes an image processing device. The image processing device is electrically connected to the pixel unit 1. The image processing device is used to perform the following functions according to different photosensitive electrical signals generated by the pixel unit 1:

Alternately acquire one frame of image data under the first photosensitive electrical signal, acquire the next frame of image data under the second photosensitive electrical signal, and fuse at least two acquired frames of image data to synthesize a third target image.

That is to say, the camera module provided by the embodiment of the present application can also operate in the first-band light and second-band light dual-spectrum imaging mode, and then realize the imaging function through multi-frame fusion technology.

For example, when a frame of image is imaged using the first waveband light, the tunable spectral filter 2 can transmit the first waveband light and cut off the second waveband light. The pixel unit 1 receives the first waveband light for photosensitization, and then passes through the image. After processing by the processing device, the imaging photos under the first waveband light are output; wherein, the first waveband light is visible light and the second waveband light is infrared light, then the visible light imaging photos are output in this step;

Then the next frame image is adjusted to use the second waveband light for imaging. The tunable spectral filter 2 cuts off the first waveband light and transmits the second waveband light. The pixel unit 1 receives the second waveband light for photosensitization. After being processed by the image processing device, the imaging photos under the second waveband light are output; wherein the first waveband light is visible light and the second waveband light is infrared light, then in this step, the infrared light imaging photos are output;

Finally, multiple frames of first-band light and second-band light imaging photos are fused and output, achieving dual-spectrum imaging, that is, dual-spectrum imaging photos of visible light and infrared light.

Among them, the pixel unit 1 can provide high photosensitivity performance for these two spectral imaging conditions. There is no need to perform filtering and interpolation during the synthetic imaging process of pixel unit 1, which provides convenient implementation conditions for image fusion.

For example, this dual-spectrum imaging mode can be used to achieve perspective imaging through clouds and fog.

In some examples of the present application, referring to Figure 4, the tunable spectral filter 2 includes a filter for transmitting The first light-transmitting area 201 for transmitting light of one wavelength band and the second light-transmitting area 202 for transmitting light of the second wave band; the first light-transmitting areas 201 and the second light-transmitting area 202 are arranged alternately and arranged to form a set transmission area. Light array; each first light-transmitting area 201 is connected, and each second light-transmitting area 202 is connected.

The tunable spectral filter 2 provided in the embodiment of the present application can be designed to perform filter adjustment by regional control. The sub-regions here refer to two regions, namely:

Area 1 is an area that can transmit light of the first waveband and cut off light of the second waveband, that is, the plurality of first light-transmitting areas 201 mentioned above. The plurality of first light-transmitting areas 201 are connected to each other to form area 1;

Region two is a region that can transmit light of the second wavelength band and cut off light of the first wavelength band, that is, the plurality of second light-transmitting regions 202 mentioned above. The plurality of second light-transmitting regions 202 are connected to each other to form region two.

For example, on the tunable spectrum filter 2, the first light-transmitting areas 201 and the second light-transmitting areas 202 are arranged alternately, see the structure shown in FIG. 4, which is beneficial to performing two different wavelength band light fusion imaging.

It should be noted that although the plurality of first light-transmitting areas 201 are arranged at intervals, they are indeed connected together, so that they can form a whole, which is beneficial to power supply control. In the same way, the plurality of second light-transmitting areas 202 are also connected.

In some examples of this application, there are multiple pixel units 1 arranged into a set pixel array; each pixel unit 1 includes three photosensitive layers arranged in a stack, and the photosensitive layers are made of silicon material. Photodiode.

The number and arrangement of the pixel units 1 can be flexibly adjusted according to specific needs, and this is not limited in the embodiments of the present application.

Each photosensitive layer in each pixel unit 1 is a photodiode of silicon material, which can detect light in the corresponding band respectively, so that one pixel unit can have a variety of pixel information; at the same time, each photosensitive layer in each pixel unit 1 The layer may also be photosensitive to, for example, infrared light.

For example, referring to FIG. 1 , each pixel unit 1 includes a first photosensitive layer 101 , a second photosensitive layer 102 and a third photosensitive layer 103 that are stacked sequentially from bottom to top, where the first photosensitive layer 101 is configured as a red photosensitive layer. , the second photosensitive layer 102 is configured as a green photosensitive layer, and the third photosensitive layer 103 is configured as a green photosensitive layer, forming a stacked RGB pixel structure.

That is to say, the pixel unit 1 can form a stacked pixel structure with a red photosensitive layer located on the bottom layer, a green photosensitive layer located on the middle layer, and a blue photosensitive layer located on the upper layer. This stacking sequence takes advantage of the principle that light of different wavelengths has different penetrating power. The longer the wavelength, the greater the penetration depth. According to the penetration depth: red light>green light>blue light, see Figure 1. This allows each pixel unit 1 to simultaneously obtain the real light intensity of three wavelengths of light at the pixel point.

In some examples of this application, the first waveband light is visible light, and each pixel unit 1 can receive light of multiple colors in the visible light for photosensitization.

Among them, the first band of light is a visible light spectrum with a wavelength between 400nm and 700nm.

When the visible light passes through the tunable spectrum filter 2, the visible light is incident on each pixel unit 1 below. Since each pixel unit 1 includes multiple photosensitive layers, each pixel unit 1 can simultaneously obtain the real image at that point. The light intensity of the three wavelengths of red, green, and blue light, in this way, each pixel unit 1 can realize a large area of light sensitivity, which can improve the quality of visible spectrum imaging.

The camera module performs visible spectrum imaging and can be used to detect the color of object images within human vision and in line with human vision.

In some examples of this application, the second waveband light is infrared light, and each pixel unit 1 can receive infrared light for photosensitization.

The second band of light is an infrared light spectrum with a wavelength greater than 700nm. In other words, the camera module can perform imaging only in the infrared spectrum.

When the tunable spectrum filter 2 is adjusted to the second state, infrared light can directly pass through the tunable spectrum filter 2. At this time, the visible light is cut off and cannot pass through, and the infrared light is incident on each pixel unit 1 below. , each photosensitive layer of each pixel unit 1 is based on a photosensitive diode made of silicon material, so that it can directly sense infrared light. This realizes infrared spectrum imaging of the camera module.

Infrared spectrum imaging can be used to detect object image information beyond human vision.

In some examples of this application, the second waveband light is ultraviolet light, and each pixel unit 1 can receive ultraviolet light for photosensitization.

Of course, in the embodiment of the present application, the camera module can also be used to perform imaging under ultraviolet light.

In some examples of this application, the tunable spectrum filter 2 is provided with an electrode structure 3; the electrode The structure 3 is electrically connected to the tunable spectrum filter 2, and the electrode structure 3 is used to provide a driving voltage for the tunable spectrum filter 2 to drive the tunable spectrum filter 2 to be adjustable between the first state and the second state. switch.

In the solution provided by the embodiment of the present application, for the tunable spectrum filter 2, by controlling the voltage applied thereto, the selective transmission of the spectrum by the tunable spectrum filter 2 can be achieved.

For example, when no voltage is applied to the tunable spectrum filter 2, it is in the first state, allowing visible light to pass through and infrared light to be cut off; when the tunable spectrum filter 2 is subject to a voltage, , it is in the second state, allowing infrared light to pass through and visible light to be cut off.

Based on its electrical characteristics, the tunable spectrum filter 2 is different from a conventional infrared filter. It has an electrode structure. The material of the tunable spectrum filter 2 is an electrotropic material.

Among them, the electrode structure 3 is arranged on the tunable spectrum filter 2, and a voltage can be applied to the tunable spectrum filter 2, see Figure 1.

Among them, the electrode structure 3 is made of transparent material electrodes. In this way, full spectrum transparency can be achieved without affecting imaging.

Optionally, the electrode structure 3 is made of indium tin oxide (ITO).

This electrode material is transparent and can transmit the full spectrum without affecting imaging.

The position of the electrode structure 3 on the tunable spectrum filter 2 can be flexibly adjusted according to specific needs, and is not limited in the embodiments of the present application.

For example, the electrode structure 3 is disposed on the surface of the tunable spectral filter 2 facing away from the pixel unit 1 .

For another example, the electrode structure 3 is disposed on the surface of the tunable spectral filter 2 facing the pixel unit 1 .

For another example, the electrode structure 3 is provided on both surfaces of the tunable spectrum filter 2 .

Further, the electrode structure 3 can be disposed on the edge area of a surface of the tunable spectrum filter 2 .

In addition, the electrode structure 3 can be provided on the tunable spectrum filter 2 through coating or conductive adhesive bonding. Moreover, the shape of the electrode structure 3 can also be flexibly set, such as a ring-shaped structure, etc., which is not specifically limited in the embodiments of the present application.

In some examples of this application, referring to Figure 1, the camera module also includes a microlens layer 4. The microlens layer 4 is disposed between the tunable spectrum filter 2 and the pixel unit 1, and covers the pixel unit 1. above.

Referring to Figure 1, a micro lens layer 4 (Micro Lens) is provided on the uppermost layer of the pixel unit 1. This micro lens layer 4 is mainly used to condense light to obtain more light input.

In addition, in some examples of this application, the camera module also includes a camera lens, and the tunable spectrum filter 2 is disposed between the camera lens and the pixel unit 1 .

Among them, the camera lens can be flexibly set to one or more as needed.

The first band of light is a visible light spectrum with a wavelength between 400nm and 700nm, and the second band of light is an infrared light spectrum with a wavelength greater than 700nm. At the same time, the pixel unit 1 includes a red photosensitive layer and a green photosensitive layer stacked sequentially from bottom to top. Taking the green photosensitive layer as an example, the control method involved in the camera module provided by the embodiment of the present application will be further explained.

The camera module provided by the embodiment of this application has three imaging functions, corresponding to three different imaging control methods: visible light spectrum imaging control method, infrared light spectrum imaging control method, and visible light and infrared light spectrum dual spectrum imaging control method.

After turning on the camera module according to the embodiment of the present application, the user can select a photo imaging mode. The camera module performs different control methods in different camera modes.

The control method for imaging of the camera module in visible light spectrum mode, see Figure 5, includes the following steps:

S501. Adjust the adjustable spectrum filter to be in the visible light spectrum imaging mode.

That is to say, the camera module needs to take pictures under visible light. At this time, for example, no voltage is applied to the tunable spectrum filter. That is, the tunable spectral filter is in the first state.

S502, visible light transmission, infrared light cutoff;

When external light is incident on the tunable spectrum filter 2, it can only allow visible light to pass through, while infrared light is intercepted and cannot pass through. At this time, it can be avoided that infrared light in visible light imaging is also transmitted to the lower pixels. Unit 1 is sensitive to light, causing photos taken under visible light to appear reddish.

S503. The pixel unit 1 is photosensitive and can form a corresponding photosensitive electrical signal;

Each pixel unit 1 located in the lower layer can receive red, green, and blue light in visible light for photosensitivity, and form a corresponding photosensitive electrical signal, such as a first photosensitive electrical signal.

S504. Visible spectrum imaging photo output.

The image processing device can respond to the photosensitive electrical signal output in S503 and control the generation of visible light spectrum imaging photos for output, so that the user can obtain the pictures he wants to take.

Visible spectrum imaging is used to detect the color of object images within human vision and in line with human vision.

The method of controlling the imaging of the camera module in the infrared light spectrum, see Figure 6, includes the following steps:

S601. Adjust the adjustable spectrum filter to be in the infrared spectrum imaging mode.

That is to say, the camera module needs to shoot under infrared light. At this time, for example, a certain voltage is applied to the tunable spectrum filter, that is, the tunable spectrum filter is in the second state.

S602, infrared light can be transmitted and visible light can be cut off;

When external light is incident on the tunable spectrum filter 2, it can only transmit infrared light, while visible light is intercepted and cannot pass through.

S603. The pixel unit is photosensitive and can form a corresponding photosensitive electrical signal;

Each pixel unit 1 located in the lower layer can receive infrared light and perform photosensitization, and form a corresponding photosensitive electrical signal, such as a second photosensitive electrical signal.

S604. Infrared spectrum imaging photo output.

The image processing device responds to the photosensitive electrical signal output in S603 and generates an infrared spectrum imaging photo for output.

Infrared spectrum imaging can be used to detect human body temperature, detect the composition of plastic waste, night vision, etc.

The dual-spectrum imaging control method of the camera module in the visible light and infrared light spectrum, see Figure 7, includes the following steps:

S701. Imaging a frame of image using the visible spectrum. Specifically, follow the following steps:

S7011. Adjust the adjustable spectrum filter to be in the visible light spectrum imaging mode;

S7012, visible light transmission, infrared light cutoff;

S7013, the pixel unit is photosensitive and can form corresponding photosensitive electrical signals;

S7014, visible spectrum imaging photo output.

The image processing device can respond to the photosensitive electrical signal output by S7013 and control the generation of visible light spectrum imaging photos for output, so that the user can obtain the pictures they want to take.

702. Use infrared spectrum imaging for the next frame of image. Specifically, follow the following steps:

S7021. Adjust the adjustable spectrum filter 2 to be in the infrared spectrum imaging mode;

That is to say, the camera module needs to take pictures under infrared light. At this time, for example, a certain voltage is applied to the tunable spectrum filter, that is, the tunable spectrum filter is in the second state.

S7022, infrared light can be transmitted and visible light can be cut off;

S7023, the pixel unit is photosensitive and can form corresponding photosensitive electrical signals;

S7024, infrared spectrum imaging photo output.

The image processing device responds to the photosensitive electrical signal output by S7023 and generates an infrared spectrum imaging photo for output.

Among them, S701 and S702 are performed alternately, but there is no strict order restriction.

S703. Multi-frame visible light and infrared spectrum imaging photos are fused and output to realize dual spectrum imaging of visible light and infrared spectrum.

According to another embodiment of the present application, an electronic device is provided.

Electronic equipment includes the above camera module.

The electronic device may be a terminal or other devices other than a terminal. For example, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle-mounted electronic device, a mobile Internet device (MID), or augmented reality. AR)/virtual reality (VR) equipment, robots, wearable devices, ultra-mobile personal computers (UMPC), netbooks or personal digital assistants (PDA), etc., can also be used for Server, network attached storage (Network Attached Storage, NAS), personal computer (personal computer, PC), television (television, TV), teller machine or self-service machine, etc., the embodiments of the present application are not specifically limited here.

Other structures and operations of electronic devices according to embodiments of the present application are known to those of ordinary skill in the art and will not be described in detail here.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like is intended to be incorporated into the description of the implementation. An example or example describes a specific feature, structure, material, or characteristic that is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the application is defined by the claims and their equivalents.

Claims

A camera module including:

Pixel unit (1), the pixel unit (1) includes a plurality of photosensitive layers arranged in a stack, each of the photosensitive layers is used to receive light in a wavelength band corresponding to the photosensitive layer; and

An adjustable spectrum filter (2), which is arranged opposite to the pixel unit (1);

The tunable spectral filter (2) is switchable between a first state and a second state;

When the tunable spectrum filter (2) is in the first state, it can transmit the first waveband light and cut off the second waveband light. The photosensitive layer corresponding to the first waveband light receives the said After the first band of light, a first photosensitive electrical signal is generated;

When the tunable spectrum filter (2) is in the second state, it can transmit light in the second band and cut off light in the first band. The photosensitive layer corresponding to the second band light receives the light. After the second waveband light, a second photosensitive electrical signal is generated.
The camera module according to claim 1, further comprising an image processing device, the image processing device being electrically connected to the pixel unit (1), and the image processing device being configured to operate according to the pixel unit. (1) The different photosensitive electrical signals generated perform at least one of the following functions:

Generate a first target image according to the first photosensitive electrical signal;

A second target image is generated according to the second photosensitive electrical signal.
The camera module according to claim 1, further comprising an image processing device, the image processing device being electrically connected to the pixel unit (1), and the image processing device being configured to operate according to the pixel unit. (1) The different photosensitive electrical signals generated perform the following functions:

Alternately acquire one frame of image data under the first photosensitive electrical signal, acquire the next frame of image data under the second photosensitive electrical signal, and fuse the acquired at least two frames of image data to synthesize a third target image .
The camera module according to claim 1, wherein the tunable spectrum filter (2) includes a first light-transmitting area (201) for transmitting the first wave band light and a first light-transmitting area (201) for transmitting the second wave band light. The second light-transmitting area (202) of light;

The first light-transmitting areas (201) and the second light-transmitting areas (202) are arranged alternately and arranged to form a set light-transmitting array;

The first light-transmitting areas (201) are connected, and the second light-transmitting areas (202) are connected.
The camera module according to claim 1, wherein the pixel units (1) are provided in multiple numbers, and the plurality of pixel units (1) are arranged into a set pixel array;

Each pixel unit (1) includes three photosensitive layers arranged in a stack, and the photosensitive layers are photodiodes made of silicon material.
The camera module according to claim 5, wherein the first waveband light is visible light, and each of the pixel units (1) can receive light of multiple colors in the visible light for photosensitization.
The camera module according to claim 5, wherein the second waveband light is infrared light, and each of the pixel units (1) can receive infrared light for photosensitization.
The camera module according to claim 5, wherein the second waveband light is ultraviolet light, and each of the pixel units (1) can receive ultraviolet light for photosensitization.
The camera module according to claim 1, wherein the adjustable spectrum filter (2) is provided with an electrode structure (3);

The electrode structure (3) is electrically connected to the tunable spectrum filter (2), and the electrode structure (3) is used to provide a driving voltage for the tunable spectrum filter (2) to drive the The tunable spectral filter (2) is switchable between the first state and the second state.
The camera module according to claim 1, further comprising a microlens layer (4), the microlens layer (4) being disposed between the adjustable spectrum filter (2) and the pixel. between the units (1) and covering the pixel unit (1).
An electronic device, including the camera module according to any one of claims 1-10.