Patent Publication Number: US-2023142989-A1

Title: Electronic device and imaging device

Description:
TECHNICAL FIELD 
     The present disclosure relates to an electronic device and an imaging device. 
     BACKGROUND ART 
     In recent electronic devices such as smartphones, mobile phones, and personal computers (PCs), various sensors such as cameras are mounted in a frame (bezel) of a display panel. On the other hand, there is a demand for making the outer size of the electronic device as compact as possible without affecting the screen size, and the bezel width tends to be narrowed. In view of such a background, a technique of disposing a camera module immediately below a display panel, and capturing an image of subject light passing through the display panel by the camera module has been proposed. 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: US Patent Publication No. 2018/0069060 
       
    
     SUMMARX OF THE INVENTION 
     Problems to be Solved by the Invention 
     However, the display panel includes a plurality of layers, and some of the layers have low visible light transmittance. Therefore, when the subject light passing through the display panel is captured by the camera module, the captured image becomes dark or becomes a blurred image as a whole. Furthermore, when the subject light passes through the display panel, there is also a possibility that the image quality of the captured image is deteriorated due to the influence of flare or diffraction. 
     In addition, in a case where the camera module is disposed on the surface of a small electronic device such as a smartphone, since the lens is thin and the diameter of the lens cannot be increased, the captured image becomes dark and an unclear image is easily obtained under a situation where the surroundings are dark. 
     The present disclosure provides an electronic device and an imaging device capable of obtaining a high-quality captured image even in a case where the amount of incident light is small. 
     Solutions to Problems 
     In order to solve the above problems, according to the present disclosure, there is provided an electronic device including: 
     a display unit; 
     a first imaging unit that is disposed on a side opposite to a display surface of the display unit and is capable of capturing an image of light in an infrared light wavelength band that has passed through the display unit; 
     a second imaging unit that is disposed on a side opposite to the display surface of the display unit and is capable of capturing an image of light in a visible light wavelength band that has passed through the display unit; and 
     a correction unit that corrects image data imaged by the second imaging unit on the basis of image data imaged by the first imaging unit. 
     The correction unit may correct sensitivity of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit. 
     A learning unit that learns a correlation between sensitivity of the image data imaged by the first imaging unit and sensitivity of the image data imaged by the second imaging unit may be provided, and the correction unit may correct the sensitivity of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit with reference to a learning result in the learning unit. 
     The correction unit may correct resolution of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit. 
     A learning unit that learns a correlation between resolution of image data imaged by the first imaging unit and resolution of image data imaged by the second imaging unit may be provided, and the correction unit may correct the resolution of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit with reference to a learning result in the learning unit. 
     The correction unit may correct at least one of a flare component or a diffracted light component included in the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit. 
     A learning unit that learns a correlation between at least one of a flare component or a diffracted light component included in image data imaged by the first imaging unit and at least one of a flare component or a diffracted light component included in image data imaged by the second imaging unit may be provided, and the correction unit may correct at least one of the flare component or the diffracted light component included in the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit with reference to a learning result in the learning unit. 
     There may be provided: 
     a reference determination unit that determines whether or not at least one of sensitivity, resolution, a flare component, or a diffracted light component of the image data imaged by the second imaging unit satisfies a predetermined first reference; 
     an imaging start instruction unit that starts imaging by the first imaging unit when the reference determination unit determines that the first reference is not satisfied; and 
     a correction procedure determination unit that determines whether or not to perform correction by the correction unit and a type of image data to be a reference of correction when correction by the correction unit is performed on the basis of a result of comparing at least one of sensitivity, resolution, a flare component, or a diffracted light component between the image data imaged by the first imaging unit and the image data imaged by the second imaging unit. 
     When the correction procedure determination unit determines a type of image data to be a reference of correction, the learning unit may learn a correlation between at least one of sensitivity, resolution, a flare component, or a diffracted light component of the determined image data and at least one of sensitivity, resolution, a flare component, or a diffracted light component of the image data imaged by the second imaging unit. 
     A sensor that detect at least one of a shape or a color of an object; 
     a reliability estimation unit that estimates reliability of learning by the learning unit; 
     an object identification determination unit that determines whether or not the object can be identified on the basis of detection data of the sensor in a case where the reliability estimated by the reliability estimation unit is equal to or less than a predetermined second reference; and 
     a color specification determination unit that determines whether or not the color of the object identified by the sensor can be specified in a case where the object identification determination unit determines that the object can be identified, and 
     in a case where the color specification determination unit determines that the color of the object can be specified, the correction unit may correct the image data imaged by the second imaging unit so as to approach the specified color. 
     The correction unit may set a noise removal degree of a pixel region having a luminance change of a predetermined reference value or less in the image data imaged by the second imaging unit to be higher than a noise removal degree of a pixel region having a luminance change larger than the reference value in the image data. 
     There may be provided: 
     a light emitting unit that emits light in an infrared light wavelength band; and 
     a light emission control unit that controls a light emission timing of the light emitting unit such that a subject is illuminated with light emitted by the light emitting unit when image data is imaged by the first imaging unit. 
     The light emitting unit may include a plurality of light sources that emits light in light emission wavelength bands different from each other in the infrared light wavelength band, 
     the light emission control unit may sequentially switch and control light emission by the plurality of light sources while the first imaging unit performs imaging, 
     the first imaging unit may output a plurality of pieces of image data imaged in emission light wavelength bands different from each other, and 
     the correction unit may correct the image data imaged by the second imaging unit on the basis of the plurality of pieces of image data. 
     The light emitting unit may be disposed on a display surface side of the display unit. 
     At least one of the first imaging unit or the second imaging unit may include a pixel that captures an image of light in an infrared light wavelength band and a pixel that captures an image of light in a visible light wavelength band. 
     The first imaging unit may have sensitivity to light of 550 nm or more. 
     The correction unit may increase the degree of correction toward a shorter wavelength side with respect to the image data imaged by the second imaging unit. 
     The first imaging unit may include a photoelectric conversion unit arranged to be longer in a normal direction of a light incident surface than the second imaging unit. 
     An area of the first imaging unit in a light incident surface direction per pixel may be larger than an area of the second imaging unit in a light incident surface direction per pixel, and 
     an area of all the pixels of the first imaging unit in the light incident surface direct on may be smaller than an area of all the pixels of the second imaging unit in the light incident surface direction. 
     According to another aspect of the present disclosure, there is provided an imaging device including: 
     a first imaging unit that is disposed on a side opposite to a display surface of a display unit and is capable of capturing an image of light in an infrared light wavelength band; 
     a second imaging unit that is disposed on a side opposite to a display surface of the display unit and is capable of capturing an image of light in a visible light wavelength band; and 
     a correction unit that corrects image data imaged by the second imaging unit on the basis of image data imaged by the first imaging unit. 
     According to another aspect of the present disclosure, there is provided an imaging device including: 
     a first imaging unit capable of capturing an image of light in an infrared light wavelength band; 
     a second imaging unit capable of capturing an image of light in a visible light wavelength band; and 
     a correction unit that corrects image data imaged by the second imaging unit on the basis of image data imaged by the first imaging unit. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is an external view and a cross-sectional view taken along line A-A of an electronic device equipped with an imaging device. 
         FIG.  2    is a cross-sectional view taken along line B-B in  FIG.  1   . 
         FIG.  3 A  is a cross-sectional view illustrating an example of a cross-sectional structure of a first imaging unit. 
         FIG.  3 B  is a cross-sectional view illustrating an example of a cross-sectional structure of a second imaging unit. 
         FIG.  4    is a block diagram illustrating an internal configuration of the electronic device according to a first embodiment. 
         FIG.  5    is a flowchart illustrating a first example of a processing operation of a signal processing unit according to the first embodiment. 
         FIG.  6    is a flowchart illustrating a second example of a processing operation of the signal processing unit. 
         FIG.  7    is a block diagram illustrating an internal configuration of an electronic device according to a second embodiment. 
         FIG.  8    is a flowchart illustrating a first example of a processing operation performed by a signal processing unit in the electronic device according to the second embodiment. 
         FIG.  9    is a flowchart illustrating a second example of a processing operation performed by the signal processing unit in a case where a multi-spectral sensor is used. 
         FIG.  10 A  is a diagram illustrating a first example of pixel arrangement. 
         FIG.  10 B  is a diagram illustrating a second example of the pixel arrangement. 
         FIG.  11    is a block diagram illustrating a first example of as internal configuration of the signal processing unit. 
         FIG.  12    is a block diagram illustrating a second example of an internal configuration of the signal processing unit. 
         FIG.  13    is a block diagram illustrating a schematic configuration of an electronic device  2  according to a fifth embodiment. 
         FIG.  14    is a flowchart illustrating a processing operation when the electronic device  2  according to the fifth embodiment performs imaging with first and second camera modules. 
         FIG.  15    is a flowchart illustrating a processing operation when the electronic device  2  according to a sixth embodiment performs imaging with the first and second camera modules. 
         FIG.  16 A  is a view illustrating an internal state of a vehicle from a rear side to a front side of the vehicle. 
         FIG.  16 B  is a view illustrating an internal state of the vehicle from an oblique rear to an oblique front of the vehicle. 
         FIG.  17 A  is a front view of a digital camera as a second application example of the electronic device. 
         FIG.  17 B  is a rear view of the digital camera. 
         FIG.  18 A  is an external view of an HMD which is a third application example of the electronic device. 
         FIG.  18 B  is an external view of a smart glass. 
         FIG.  19    is an external view of a TV which is a fourth application example of the electronic device. 
         FIG.  20    is an external view of a smartphone which is a fifth application example of the electronic device. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, embodiments of as electronic device and an imaging device will be described with reference to the drawings. Hereinafter, the main components of the electronic device and the imaging device will be mainly described, but the electronic device and the imaging device may have components and functions that are not illustrated or described. The following description does not exclude components and functions that are not illustrated or described. 
     First Embodiment 
       FIG.  1    is an external view and a cross-sectional view taken along line A-A of an electronic device  2  on which an imaging device  1  according to a first embodiment is mounted, and  FIG.  2    is a cross-sectional view taken along line B-B of  FIG.  1   . The electronic device  2  according to the present embodiment is any electronic device  2  having both a display function and a capturing function, such as a smartphone, a mobile phone, a tablet, or a PC. The electronic device  2  of  FIG.  1    includes camera modules (first and second imaging units)  4  and  5  arranged on the opposite side of a display surface  3   a  of a display unit  3 , As described above, in the electronic device  2  of  FIG.  1   , the camera modules  4  and  5  are provided on the back side of the display surface  3   a  of the display unit  3 . Therefore, the camera modules  4  and  5  perform capturing through the display unit  3 . 
     The imaging device  1  according to the present embodiment includes a plurality of camera modules  4  and  5 . In the present specification, an example in which two camera modules  4  and  5  are provided will be mainly described, but three, or more camera modules may be provided. Hereinafter, an example in which the imaging device  1  includes two camera modules  4  and  5  will be mainly described. As described later, the camera module  4  includes a first imaging unit  6 , and the camera module  5  includes a second imaging unit  7 . The first imaging unit  6  can capture an image of light in an infrared light wavelength band that has passed through the display unit  3 , The infrared light wavelength band is, for example, a wavelength band within a range of 780 nm to 1000 nm, The second imaging unit  7  can capture an image of light in a visible light wavelength band that has passed through the display unit  3 . The visible light wavelength band is, for example, a wavelength band within a range of 380 nm to 750 nm. 
     In the electronic device  2  according to the present embodiment, the display surface  3   a  spreads to the vicinity of the outer size of the electronic device  2 , and the width of a bezel  3   b  around the display surface  3   a  is set to several mm or less. Normally, a front camera is often mounted on the bezel  3   b,  but in  FIG.  1   , as indicated by a broken line circle, a plurality of camera modules  4  and  5  functioning as front cameras is arranged on a back surface side of the substantially central portion of the display surface  3   a.  In this way, by providing the front camera on the back surface side of the display surface  3   a,  it is not necessary to dispose the front camera in the bezel  3   b,  and the width of the bezel  3   b  can be narrowed. 
     Note that, in  FIG.  1   , the camera modules  4  and  5  are arranged on the back surface side of the substantially central portion of the display surface  3   a,  but the camera modules  4  and  5  may be arranged at any place on the back surface side of the display surface  3   a,  and for example, the camera modules  4  and  5  may be arranged on the back surface side near the peripheral edge portion of the display surface  3   a.  In this manner, the plurality of camera modules  4  and  5  in the present embodiment is arranged at any positions on the back surface side overlapping the display surface  3   a.    
     As shown in  FIGS.  1  and  2   , the display unit  3  is a laminated body in which a protective film  3   c,  a polyimide substrate  3   d,  a display layer  3   e,  a barrier layer  3   f,  a touch sensor layer  3   g,  an adhesive layer  3   h,  a circularly polarizing plate  3   i,  an optical clear adhesive (OCA)  3   j,  and a cover glass  3   k  are sequentially laminated. The display layer  3   e  may be, for example, an organic light emitting device (OLED) display layer, a liquid crystal display layer, a microLED, or a display layer based on another display principle. The display layer  3   e  may include a plurality of layers. For example, the display layer  3   e  may include a color filter layer, a backlight layer, and the like. The display unit  3  performs display using light in the visible light wavelength range, but the light displayed on the display unit  3  may include an infrared light component. 
     The barrier layer  3   f  is a layer that prevents oxygen and moisture from entering the display layer  3   e.  A touch sensor is incorporated in the touch sensor layer  3   g.  There are various types of touch sensors such as a capacitive type and a resistive film type, but any type may be adopted. In addition, the touch sensor layer  3   g  and the display layer  3   e  may be integrated. 
     The adhesive layer  3   h  is provided for bonding the circularly polarizing plate  3   i  and the touch sensor layer  3   g.  A material having high visible light transmittance is used for the adhesive layer  3   h.  The circularly polarizing plate  3   i  is provided for reducing glare and enhancing visibility of the display surface  3   a  even in a bright environment. The optical clear adhesive  3   j  is provided for enhancing adhesion between the circularly polarizing, plate  3   i  and the cover glass  3   k.  A material having high visible light transmittance is used for the optical clear adhesive  3   j.  The cover glass  3   k  is provided for protecting the display layer  3   e  and the like. Note that the layer configuration of the display unit  3  is not necessarily limited to that illustrated in  FIGS.  1  and  2   . 
     As illustrated in  FIG.  2   , the camera module  4  includes a first optical system  8  in association with the first imaging unit  6 . Similarly, the camera modules  4  and  5  have a second optical system  9  in association with the second imaging unit  7 . The first and second optical systems  8  and  9  are arranged on the light incident surface side of the first and second imaging units  6  and  7 , that is, on the side close to the display unit  3 , and collect the light passing through the display unit  3  to the first and second imaging units  6  and  7 . The optical system  5  is usually configured by a plurality of lenses, but a specific optical configuration of the optical system is not limited. 
     As will be described later, the first imaging unit  6  includes a first photoelectric conversion unit, and the second imaging unit  7  includes a second photoelectric conversion unit. The first photoelectric conversion unit and the second photoelectric conversion unit photoelectrically convert light incident via the display unit  3 . The first photoelectric conversion unit and the second photoelectric conversion unit have different optical wavelength bands in which photoelectric conversion can be performed. The first photoelectric conversion unit mainly photoelectrically converts light in an infrared light wavelength band, and the second photoelectric conversion unit mainly photoelectrically converts light in a visible light wavelength band. The first photoelectric conversion unit and the second photoelectric conversion unit may be complementary metal oxide semiconductor (CMOS) sensors or charge coupled device (CCD) sensors. Furthermore, the photoelectric conversion unit may be a photodiode or an organic photoelectric conversion film. 
     The first and second photoelectric conversion units each have a photoelectric conversion element such as a CMOS sensor for each pixel. Each pixel can be arranged in any manner. Specifically, the arrangement system of each pixel may be a Bayer arrangement, an interline arrangement, a checkered arrangement, a stripe arrangement, or other arrangements. 
     As illustrated in  FIGS.  1  and  2   , in the electronic device  2  according to the present embodiment, the plurality of camera modules  4  and  5  captures an image of subject light transmitted through the display unit  3 . As illustrated in  FIG.  1   , the display unit  3  includes a plurality of layers, and each layer has no problem as long as the transmittance of light in a wavelength band in which the first imaging unit  6  and the second imaging unit  7  have sufficient sensitivity is high. However, in practice, there is a possibility that the transmittance of some layers is low. For example, in the polyimide substrate  3   d,  while the visible light transmittance is not so high, the infrared light transmittance is higher than the visible light transmittance. 
     Therefore, in the present embodiment, a correction unit to be described later is provided, and the captured image data of the second imaging unit  7  that captures an image of light in the visible light wavelength band is corrected on the basis of the captured image data of the first imaging unit  6  that captures an image of light in the infrared light wavelength band 
       FIG.  3 A  is a cross-sectional view illustrating an example of a cross-sectional structure of the first imaging unit  6 , and  FIG.  3 B  is a cross-sectional view illustrating an example of a cross-sectional structure of the second imaging unit  7 . The first imaging unit  6  illustrated in  FIG.  3 A  includes a first photoelectric conversion unit  12   a  formed in a semiconductor substrate  11 , and the first photoelectric conversion unit  12   a  is divided by an element isolation layer  13  for each pixel. A flattening layer  14  is disposed on the first photoelectric conversion unit  12   a,  and an on-chip lens  15   a  is disposed thereon. The light is incident through the on-chip lens  15   a.  Therefore, the on-chip lens  15   a  becomes a light incident surface. In the present specification, the side on which the on-chip lens  15   a  is disposed is referred to as a back surface side of the first imaging unit  6 . 
     On the other hand, the second imaging unit  7  illustrated in  FIG.  3 B  includes a second photoelectric conversion unit  12   b  formed in the semiconductor substrate, and the second photoelectric conversion unit  12   b  is divided by the element isolation layer  13  for each pixel. The flattening layer  14  is disposed on the second photoelectric conversion unit  12   b,  and a color filter layer  16  is disposed thereon. The color filter layer  16  may have filter layers of three colors of RGB, or may have filter layers of cyan, magenta, and yellow which are complementary colors thereof. An on-chip lens  15   b  is disposed on the color filter layer  16 . 
     As can be seen by comparing the cross-sectional views of  FIGS.  3 A . and  3 B, the first photoelectric conversion unit  12   a  of the first imaging unit  6  is longer than the second photoelectric conversion unit  12   b  of the second imaging unit  7  in the normal direction of the light incident surface. This is because the photoelectric conversion efficiency of the light in the infrared light wavelength band is worse than the photoelectric conversion efficiency of the light in the visible light wavelength band, and the length of the light incident surface of the first photoelectric conversion unit  12   a  in the normal direction is made longer to improve the photoelectric conversion efficiency. 
     Furthermore, since infrared light is less likely to be refracted than visible light, as illustrated in  FIGS.  3 A and  3 B , the curvature of the on-chip lens  15   a  of the first imaging unit  6  may be made larger than the curvature of the on-chip lens  15   b  of the second imaging unit  7 . 
     The area of the first imaging unit  6  in the light incident surface direction per pixel may be made larger than the area of the second imaging unit  7  in the light incident surface direction per pixel. The first imaging unit  6  is provided for correcting the sensitivity or the like of the captured image of the second imaging unit  7  and a larger area is desirable because the sensitivity can be improved. 
     On the other hand, the area (effective pixel area) in the light incident surface direction including all the pixels of the second imaging unit  7  may be larger than the area (effective pixel area) in the light incident surface direction including all the pixels of the first imaging unit  6 . The first imaging unit  6  is for correcting the captured image of the second imaging unit  7 , and may be provided at a ratio of one pixel to a plurality of pixels of the second imaging unit  7 , for example. Note that the sizes and the number of pixels of the first imaging unit  6  and the second imaging unit  7  are not limited to those described above. A specific layout arrangement example of the first imaging unit  6  and the second imaging unit  7  will be described later. On the front surface side (the side opposite to the on-chip lenses  15   a  and  15   b ) of the first imaging unit  6  and the second imaging unit  7 , a read circuit  17  is formed on the semiconductor substrate  11 , and the periphery of the read circuit  17  is covered with an interlayer insulating film  18 . The read circuit  17  includes a transfer transistor, a reset transistor, an amplification transistor, a selection transistor, and the like. Note that the cross-sectional structures of the first imaging unit  6  and the second imaging unit  7  are not limited to those illustrated in  FIG.  3   . 
       FIG.  4    is a block diagram illustrating an internal configuration of the electronic device  2  according to the first embodiment. As illustrated in  FIG.  4   , the electronic device  2  includes the imaging device  1 , an application processor  21 , a video signal generation unit  22 , an A/D conversion unit  23 , a display control unit  24 , and the display unit  3 . 
     The imaging device  1  can include one or a plurality of semiconductor devices. More specifically, the imaging device  1  includes the first and second camera modules  4  and  5 , the first optical system  8  corresponding to the first imaging unit  6 , the second optical system  9  and an infrared ray (IR) cut filter  10  corresponding to the second imaging unit  7 , a first A/D conversion unit  31  corresponding to the first imaging unit  6 , a second A/D conversion unit  32  corresponding to the second imaging unit  7 , a signal processing unit  33 , an imaging control unit  34 , and an output unit  35 . The first and second camera modules  4  and  5  may be mounted on a common substrate. 
     The first A/D conversion unit  31  converts an analog pixel signal photoelectrically converted by the first photoelectric conversion unit  12   a  into digital pixel data. The second A/D conversion unit  32  converts an analog pixel signal photoelectrically converted by the second photoelectric conversion unit  12   b  into digital pixel data. 
     As will be described later, the signal processing unit  33  generates image data corresponding to captured images by the first imaging unit  6  and the second imaging unit  7 . The signal processing unit  33  functions as a correction unit that corrects the sensitivity of the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 . The imaging control unit  34  controls whether or not the first imaging unit  6  performs imaging in accordance with an instruction from the signal processing unit  33 . 
     The application processor  21  is a semiconductor device separate from the first and second camera modules  4  and  5 , and is mounted on the same or a different substrate from the first and second camera modules  4  and  5 . The application processor  21  includes a central processing unit (CPU) and the like therein, and executes programs such as an operating system and various application software. The application processor  21  may have a function of performing image processing, signal processing, or the like, of a graphics processing unit (CPU), a baseband processor, or the like. The application processor  21  executes various processing on the input image data and calculation result as necessary, performs control to display an image on the display unit  3  of the electronic device  2 , or performs transmission to an external cloud server via a predetermined network. 
     The video signal generation unit  22  generates a video signal to be displayed on the display unit  3 . The A/D conversion unit  23  converts the video signal into digital pixel data. The display control unit  24  performs control to display the digital pixel data on the display unit  3 . 
       FIG.  5    is a flowchart illustrating a first example of a processing operation of the signal processing unit  33  according to the first embodiment. The flowchart of  FIG.  5    corrects the sensitivity of the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 . 
     First, it is determined whether or not the pixel value of the image data imaged by the second imaging unit  7  is equal to or less than a predetermined threshold (step S 1 ). Here, the average pixel value of the image data imaged by the second imaging unit  7  may be compared with a predetermined threshold, or the pixel value of a partial pixel region of the image data imaged by the second imaging unit  7  may be compared with a predetermined threshold. 
     In a case where it is determined in step S 1  that the pixel value is not equal to or less than the predetermined threshold, it can be estimated that the image data imaged by the second imaging unit  7  has sufficient sensitivity, and thus, predetermined signal processing is performed on the basis of the image data imaged by the second imaging unit  7  to generate and output ROB data (step S 2 ). 
     On the other hand, in a case where it is determined in step S 1  that the pixel value is equal to or less than the predetermined threshold, it can be estimated that the sensitivity of the image data imaged by the second imaging unit  7  is insufficient, and thus, imaging start is instructed to the first imaging unit  6  via the imaging control unit (step S 3 ). The first imaging unit  6  may include a plurality of imaging sensors capable of separately capturing an image of light in a plurality of narrow wavelength bands (for example, 750 nm, 800 nm, 850 nm, and the like) in the infrared light wavelength band. 
     Thereafter, the pixel value of the image data imaged by the first imaging unit  6  is compared with the pixel value of the image data imaged by the second imaging unit  7  (step S 4 ). In step S 4 , for example, it is determined whether or not the pixel value of the image data imaged by the first imaging unit  6  is X times (X is a predetermined reference value larger than 1) or more the pixel value of the image data imaged by the second imaging unit  7 . The value of X may be set and changed by the user. 
     When NO is determined in step S 4 , it can be estimated that the image data imaged by the first imaging unit  6  is not so sensitive, and thus the processing of step S 2  described above is performed without performing the correction processing. When YES is determined in step S 4 , it can be estimated that the sensitivity of the image data imaged by the first imaging unit  6  is sufficiently high, and thus it is determined whether or not there is a pixel having a pixel value equal to or greater than a predetermined threshold in the image data imaged by the second imaging unit  7  (step S 5 ). The reason why the determination processing in step S 5  is provided is that, if there is pixel data having a large pixel value in the captured image data of the second imaging unit  7  that captures an image of light in the visible light wavelength band, the pixel data is regarded as effective data with high sensitivity. 
     When YES is determined in step S 5 , pixel data having a pixel value equal to or greater than a predetermined threshold and image data imaged by the first imaging unit  6  are selected as effective data in the image data imaged by the second imaging unit  7  (step S 6 ). 
     When NO is determined in step S 5 , it can be estimated that the image data imaged by the second imaging unit  7  is not reliable, and thus the image data imaged by the first imaging unit  6  is selected as effective data (step S 7 ). 
     Next, the image data imaged by the second imaging unit  7  is corrected on the basis of the effective data selected in step S 6  or S 7  (step S 8 ). Here, for example, a learning model in which a correlation between the sensitivity of the image data imaged by the first imaging unit  6  and the sensitivity of the image data imaged by the second imaging unit  7  is learned in advance is generated. For example, a convolution neural network (CNN) is used to extract features of an image for appropriately performing sensitivity correction, and the image data imaged by the first imaging unit  6  is used to generate a learning model that can automatically correct the sensitivity of the image data imaged by the second imaging unit  7 . A series of processing for generating a learning model is called machine learning. By performing arithmetic processing by inputting the effective data selected in step S 6  or S 7  to the learning model in which sufficient learning has been performed, corrected image data is output from the learning model. The output image data is data in which sensitivity is appropriately corrected for each color component of RGB. 
     As described above, in a case where it is estimated that the pixel value of the image data imaged by the second imaging unit  7  is large and the reliability is high, the signal processing unit  33  outputs the image data without correcting the sensitivity, and in a case where it is estimated that the pixel value is small and the reliability is high, the signal processing unit  33  corrects the sensitivity of the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 . When the correction is performed, the correlation between the sensitivity of the image data imaged by the first imaging unit  6  and the sensitivity of the image data imaged by the second imaging unit  7  is learned in advance, and the correction is performed using the learning result. 
     In  FIG.  5   , an example of correcting the sensitivity of the image data imaged by the second imaging unit  7  has been described. However, a similar processing procedure can be applied to a case of correcting the resolution of the image data imaged by the second imaging unit  7 . The reduction in resolution occurs when a part of light to be incident on the second camera module  5  is lost by passing through the display unit  3 . Therefore, by performing processing similar to that in  FIG.  5   , the image data imaged by the second imaging unit  7  is corrected on the basis of the image data imaged by the first imaging unit  6 , whereby the resolution of the image data imaged by the second imaging unit  7  can be improved. At that time, the correction processing in step S 8  needs to be processing different from the sensitivity correction. That is, in the case of the sensitivity correction, the learning model for appropriately correcting the sensitivity is generated, but in the case of the resolution correction, the learning model for appropriately correcting the resolution is generated, and the effective data selected in step S 6  or S 7  can be input to the learning model to obtain the resolution-corrected image data at a stage where the learning model is sufficiently learned. More specifically, the learning model in the case of correcting the resolution learns the correlation between the resolution of the image data imaged by the first imaging unit  6  and the resolution of the image data imaged by the second imaging unit  7 . The signal processing unit  33  functioning as a correction unit refers to the learning result in the learning unit and corrects the resolution of the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 . 
     The signal processing unit  33  functioning as a correction unit may increase the degree of correction toward the shorter wavelength side with respect to the image data imaged by the second imaging unit  7 . This is because the blue component of the subject light passing through the display unit  3  is more easily absorbed by the display unit  3 . 
     Although the example in which the sensitivity correction or the resolution correction of the image data imaged by the second imaging unit  7  is performed has been described above, there is a possibility that the subject light is reflected or diffracted while passing through the display unit  3 , and the subject light affected by flare due to the reflection or diffraction is incident on the first and second camera modules  4  and  5 . Therefore, the signal processing unit  33  may perform processing of correcting the influence by flare or diffracted light. 
       FIG.  6    is a flowchart illustrating a second example of the processing operation of the signal processing unit  33 . The flowchart of  FIG.  6    corrects the influence by flare or diffraction of image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 . 
     First, it is determined whether or not the pixel value of the image data imaged by the second imaging unit  7  is a predetermined threshold or more (step S 11 ). In a case where light incident on the second imaging unit  7  is affected by flare or diffraction, the pixel value generally increases. Therefore, in step S 11 , it is determined whether or not the pixel value of the image data imaged by the second imaging unit  7  is a predetermined threshold or more, and if the pixel value is less than the threshold, it is determined that the image data is not affected by flare or diffraction, and predetermined signal processing is performed on the basis of the image data imaged by the second imaging unit  7  to generate and output RGB data (step S 12 ). 
     On the other hand, in a case where it is determined in step S 11  that the pixel value is equal to or more than the predetermined threshold, it can be estimated that the image data imaged by the second imaging unit  7  is affected by flare or diffraction, and thus, imaging start is instructed to the first imaging unit  6  via the imaging control unit (step S 13 ). 
     Thereafter, the pixel value of the image data imaged by the first imaging unit  6  is compared with the pixel value of the image data imaged by the second imaging unit  7  (step S 14 ). Here, as in step S 4  in FIG.  5 , for example, it is determined whether or not the pixel value of the image data imaged by the first imaging unit  6  is X times (X is a predetermined reference value larger than 1) or less the pixel value of the image data imaged by the second imaging unit  7 . 
     When NO is determined in step S 14 , it can be estimated that the influence of flare or diffraction of the image data imaged by the second imaging unit  7  cannot be corrected even using the image data imaged by the first imaging unit  6 . Therefore, the processing of step S 12  is performed without performing the correction processing. When YES is determined in step S 14 , it can be estimated that the image data imaged by the first imaging unit  6  is not affected by flare or diffraction, and thus, it is determined whether or not there is a pixel having a pixel value equal to or less than a predetermined threshold in the image data imaged by the second imaging unit  7  (step S 15 ). 
     When YES is determined in step S 15 , pixel data having a pixel value equal to or less than a predetermined threshold and image data imaged by the first imaging unit  6  are selected as effective data in the image data imaged by the second imaging unit  7  (step S 16 ). 
     When NO is determined in step S 15 , it can be estimated that the image data imaged by the second imaging unit  7  is not reliable, and thus the image data imaged by the first imaging unit  6  is selected as effective data (step S 17 ). 
     Next, the image data imaged by the second imaging unit  7  is corrected on the basis of the effective data selected in step S 16  or S 17  (step S 18 ). Here, for example, a learning model in which a correlation between at least one of a flare component or a diffracted light component included in image data imaged by the first imaging unit  6  and at least one of a flare component or a diffracted light component included in image data imaged by the second imaging unit  7  has been learned in advance is generated, and the effective data selected in step S 16  or S 17  is input to the learning model in which sufficient learning has been performed, so that corrected image data is output from the learning model. The output image data is data in which the influence of flare or diffraction is appropriately corrected for each color component of RGB. 
     To summarize the processing of the flowcharts of  FIGS.  5  and  6   , the signal processing unit  33  performs processing of a reference determination unit (step S 1 , S 11 ), an imaging start instruction unit (step S 2 , S 12 ), and a correction procedure determination unit (steps S 3  to S 8 , S 13  to S 18 ). The reference determination unit determines whether or not at least one of the sensitivity, the resolution, the flare component, or the diffracted light component of the image data imaged by the second imaging unit  7  satisfies a predetermined first reference. When the reference determination unit determines that the first reference is not satisfied, the imaging start designation unit starts imaging by the first imaging unit  6 . The correction procedure determination unit determines whether or not to perform correction by the correction unit and a type of image data to be a reference of correction when correction by the correction unit is performed on the basis of a result of comparing at least one of sensitivity, resolution, a flare component, or a diffracted light component between image data imaged by the first imaging unit  6  and image data imaged by the second imaging unit  7 . When the type of image data to be a reference of correction is determined by the correction procedure determination unit, the signal processing unit  33  (learning unit) learns a correlation between at least one of sensitivity, resolution, a flare component, or a diffracted light component of the determined image data and at least one of sensitivity, resolution, a flare component, or a diffracted light component of the image data imaged by the second imaging unit  7 . 
     Note that the processing of  FIG.  5    and the processing of  FIG.  6    may be performed in combination. That is, the signal processing unit  33  may correct two or more of the sensitivity, the resolution, the influence by the flare component, and the influence by the diffracted light component of the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 . 
     As described above, in the first embodiment, the image data imaged by the second imaging unit  7  that captures an image of light in the visible light wavelength band is corrected as necessary on the basis of the image data imaged by the first imaging unit  6  that captures an image of light in the infrared light wavelength band. Therefore, even if the subject light is incident on the first and second camera modules  4  and  5  through the display unit  3 , there is no possibility that sensitivity or resolution is reduced, and the subject light is not affected by flare or diffraction. 
     Second Embodiment 
     In the second embodiment, a measure is taken in a case where sufficient learning is not performed in the machine learning performed in step S 8  of  FIG.  5    or step S 18  of  FIG.  6   . 
       FIG.  7    is a block diagram illustrating an internal configuration of an electronic device  2   a  according to the second embodiment. The electronic device  2   a  of  FIG.  7    includes a depth sensor  36  in addition to the configuration of  FIG.  4   . The depth sensor  36  is a sensor that detects distance information to an object. The depth sensor  36  may detect the distance information by, for example, an indirect time of flight (ToF) method. The depth sensor  36  is disposed, for example, in a portion of the bezel  3   b  on the display surface side of the electronic device  2  in  FIG.  1   . The distance information detected by the depth sensor  36  is transmitted to the signal processing unit  33 . 
       FIG.  8    is a flowchart illustrating a first example of a processing operation performed by the signal processing unit  33  in the electronic device  2   a  according to the second embodiment. The signal processing unit  33  performs the processing of  FIG.  8    after performing the processing of  FIG.  5  or  6   . 
     First, it is determined whether or not machine learning has been sufficiently performed (step S 21 ). When input data is given to a learning model generated by machine learning, arithmetic processing is performed using the learning model, and output data is generated. If the input data is data within a range assumed in advance, appropriate output data reflecting the result of the machine learning can be obtained by performing interpolation processing. However, in a case where the input data is data outside the range assumed in advance, it is necessary to perform extrapolation processing, and the accuracy of the output data decreases. Therefore, in step S 21 , for example, it is determined whether or not the machine learning has been sufficiently performed on the basis of whether or not the extrapolation processing is necessary for the input data. Note that whether or not the machine learning has been sufficiently performed may be determined by another method. 
     In a case where ft is determined in step S 21  that the machine learning has been sufficiently performed, the data subjected to the arithmetic processing by the learning model is output without performing color correction (step S  22 ). 
     In a case where it is determined in step S 21  that the machine learning has not been sufficiently performed, the distance information is detected by the depth sensor  36  (step S 23 ). Next, on the basis of the distance information detected by the depth sensor  36 , the shape of the object captured in corrected imaging data in the processing of  FIG.  5    or  FIG.  6    is grasped to identify the object (step S 24 ). In a case where the signal processing unit  33  alone cannot identify an object, the imaging data corrected in the processing of  FIG.  5    or  FIG.  6    and the distance information detected by the depth sensor  36  may be transmitted to a cloud server or the like via a network, an object may be specified by performing shape analysis of the object using enormous data (big data) managed by the cloud server or the like, and the information of the specified object may be received by the signal processing unit  33  via the network. Alternatively, the imaging data corrected in the processing of  FIG.  5  or  6    and the distance information detected by the depth sensor  36  may be transmitted to the application processor, and the application processor may specify the object. 
     Next, it is determined whether or not the color of the object identified in step S 24  is known (step S 25 ). When the color of the object is not known, the color correction is abandoned, and the processing of step S 22  is performed. When the color of the object is known, color correction is performed so as to approach the known color (step  826 ). Here, a database for managing the color information of the identified object may be provided, and the database may be accessed to acquire the color information of the identified object. 
     As described above, in the processing of  FIG.  8   , in a case where learning has not been sufficiently performed by machine learning, the shape of the object is detected using the depth sensor  36  to identify the object, and color correction is performed on the basis of known color information regarding the identified object. 
     In  FIGS.  7  and  8   , an example in which the shape of the object is detected by the depth sensor  36  is illustrated, but information of the object may be detected using another sensor. For example, a multi-spectral sensor may be provided instead of the depth sensor  36  or in addition to the depth sensor  36 . 
       FIG.  9    is a flowchart illustrating a second example of a processing operation performed by the signal processing unit  33  in a case where a multi-spectral sensor is used. The processing in steps S 31  to S 32  is similar to the processing in steps S 21  to S 22  in  FIG.  8   . When it is determined in step S 31  that the machine learning has not been sufficiently performed, color information is detected by the multi-spectral sensor (step S 33 ). Since the multi-spectral sensor can separately detect light in a plurality of wavelength bands, color information of an object included in image data imaged by the second imaging unit  7  can be detected in detail. Next, an object is identified from the color information detected in step S 33  (step S 34 ). At this time, as described above, the object may be identified by a cloud server or an application processor. 
     Next, it is determined whether or not the color of the object identified in step S 34  is known (step S 35 ). In a case where the, color of the object is unknown, color correction is performed on the basis of the color information detected by the multi-spectral sensor (step S 36 ). In a case where the color of the object is known, color correction is performed so as to approach the known color (step S 37 ). 
     To summarize the processing of the flowcharts of  FIGS.  8  and  9   , the signal processing unit  33  performs processing of a reliability estimation unit (steps S 21  and S 31 ), an object identification determination unit (steps S 23  and S 33 ), and a color specification determination unit (steps S 24  and q 34 ). The reliability estimation unit estimates the reliability of learning by the learning unit. In a case where the reliability estimated by the reliability estimation unit is equal to or less than a predetermined second reference, the object identification determination unit determines whether or not the object can be identified on the basis of the detection data of the sensor. In a case where the object identification determination unit determines that the object can be identified, the color specification determination unit determines whether or not the color of the object identified by the sensor can be specified. In a case where the color specification determination unit determines that the color of the object can be specified, the signal processing unit  33  functioning as the correction unit corrects the image data imaged by the second imaging unit  7  so as to approach the specified color. 
     Note that the processing of  FIG.  8    and the processing of  FIG.  9    may be performed in combination. If the object is specified on the basis of the result of detecting the shape information and the color information of the object by the depth sensor  36 , the multi-spectral sensor, or the like, the object can be specified more accurately, and the color correction of the specified object can be performed accurately. 
     As described above, in the second embodiment, it is not preferable to correct the image data imaged by the second imaging data in a state where learning by machine learning is insufficient. Therefore, in a case where learning by machine learning is insufficient, color correction of the image data imaged by the second imaging unit  7  is performed using another sensor such as the depth sensor  36  or the multi-spectral sensor. As a result, it is possible to avoid a possibility of performing correction with low reliability in a state where learning by machine learning is insufficient. 
     Third Embodiment 
     In a third embodiment, the pixel arrangement of the first imaging unit  6  and the second imaging unit  7  is characterized. The first imaging unit  6  that receives and photoelectrically converts light in the infrared light wavelength band includes a plurality of pixels. Similarly, the second imaging unit  7  that receives and photoelectrically converts light in the visible light wavelength band also includes a plurality of pixels. A part of the plurality of pixels constituting the first imaging unit  6  may include pixels capable of receiving light in the visible light wavelength band. 
       FIG.  10 A  is a diagram illustrating a first example of pixel arrangement. In the first example illustrated in  FIG.  10 A , a pixel that receives and photoelectrically converts light in the infrared light wavelength band is denoted as IR, and a pixel that receives and photoelectrically converts light in a wavelength band corresponding to red is denoted as R. In the example of  FIG.  10 A , IR pixels and R pixels are arranged in a staggered manner. Note that the arrangement order of the IR pixels and the R pixels and the ratio of the number of respective pixels are arbitrary. 
     Red light has a wavelength component (for example, 550 nm or more) close to infrared light. By arranging the R pixels between the IR pixels, the optical wavelength band that can be received by the first imaging unit  6  can be further expanded. When the signal processing unit  33  described above corrects the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6 , the red component is included in the image data imaged by the first imaging unit  6 , so that adjustment with the red component included in the image data imaged by the second imaging unit  7  is facilitated, and highly reliable correction processing can be performed. 
       FIG.  10 B  is a diagram illustrating a second example of the pixel arrangement. In the second example illustrated in  FIG.  10 B , a part of the plurality of pixels constituting the second imaging unit  7  includes pixels capable of receiving light in the infrared light wavelength band. In  FIG.  10 B , a pixel that receives and photoelectrically converts light in the visible light wavelength band is denoted as R, G, or G, and a pixel that receives and photoelectrically converts light in the infrared light band is denoted as IR. One IR pixel is disposed for three RGB pixels. Note that the arrangement order of the RGB pixels and the IR pixel and the ratio of the number of respective pixels are arbitrary. 
     By arranging the IR pixels between the RGB pixels, the first imaging unit  6  and the second imaging unit  7  can be formed on one semiconductor chip. As a result, only one camera module  4  or  5  needs to be provided, and the hardware cost of the electronic device  2  can be reduced. 
     As described above, in the third embodiment, by arranging the pixels that receive the light in the visible light wavelength band between the pixels that receive the light in the infrared light wavelength band, it is possible to improve the reliability of the correction processing performed by the signal processing unit  33 . Furthermore, the first imaging unit  6  and the second imaging unit  7  can be formed on one semiconductor chip by arranging pixels that receive light in the infrared light wavelength band between pixels that receive light in the visible light wavelength band 
     Fourth Embodiment 
     In the first embodiment, an example of correcting the image data imaged by the second imaging unit  7  using machine learning has been described. However, the image data imaged by the second imaging unit  7  can be corrected by the signal processing unit  33  without necessarily using machine learning. 
       FIG.  11    is a block diagram illustrating a first example of an internal configuration of the signal processing unit  33 . The signal processing unit  33  in  FIG.  11    includes a clamp unit  33   a,  a color output unit  33   b,  a defect correction unit  33   c,  a linear matrix unit  33   d,  a gamma correction unit  33   e,  a luminance chroma signal generation unit  33   f,  a noise reduction unit  33   g,  and an edge enhancement unit  33   h.    
     The clamp unit  33   a  performs processing of defining a black level. More specifically, the clamp unit  33   a  performs processing of subtracting the black level data from the digital pixel data. The color output unit  33   b  outputs, for example, pixel data for each color of RGB. The defect correction unit  33   c  performs processing of correcting the imaging data of the specific pixel that cannot be correctly read for some reason from the imaging data of surrounding pixels. The linear matrix unit  33   d  performs matrix operation on color information such as RGB to perform more correct color reproduction. The gamma correction unit  33   e  performs gamma correction so as to enable display with excellent visibility in accordance with the display characteristics of the display unit  3 . For example, the gamma correction unit  33   e  performs conversion from 10 bits to 8 bits while changing the gradient. The luminance chroma signal generation unit  33   f  generates a luminance chroma signal to be displayed on the display unit  3  on the basis of the output data of the gamma correction unit  33   e.  The noise reduction unit  33   g  performs processing of reducing noise included in the luminance chrome signal. The edge enhancement unit  33   h  performs processing of enhancing an edge of the subject image on the basis of the luminance chroma signal. The noise reduction processing by the noise reduction unit  33   g  and the edge enhancement processing by the edge enhancement unit  33   h  may be performed only in a case where a predetermined condition is satisfied. The output unit  35  outputs the luminance chroma signal subjected to the noise reduction processing. 
     The noise reduction unit  33   g  determines whether or not the pixel region is a pixel region with a small luminance change on the basis of the image data imaged by the first imaging unit  6 , and increases the noise removal ratio for the pixel region with a small luminance change. More specifically, the noise reduction unit  33   g  sets the noise removal degree of the pixel region in which the luminance change is equal to or less than a predetermined reference value in the image data imaged by the second imaging unit  7  to be higher than the noise removal degree of the pixel region in which the luminance change is larger than the reference value in the image data. 
     As a result, the data amount of the image data imaged by the second imaging unit  7  can be reduced. On the other hand, the noise removal ratio is weakened for a pixel region with a large luminance change. The reason for this is that as the noise removal ratio is increased, the edge becomes unclear and the resolution also decreases, and in order to sharpen the edge and improve the resolution, it is desirable to weaken the noise removal ratio. However, if the noise removal ratio is weakened for all the pixels, the data amount of the image data becomes enormous. Therefore, it is desirable to weaken the noise removal ratio only in a limited pixel region such as an edge portion. 
       FIG.  12    is a block diagram illustrating a second example of the internal configuration of the signal processing unit  33 . The signal processing unit  33  of  FIG.  11    is obtained by providing a flare extraction unit  33   i  and a flare correction unit  33   i  in the signal processing unit  33  of  FIG.  11   . 
     The flare extraction unit  33   i  compares the pixel value of the image data imaged by the first imaging unit  6  with the pixel value of the image data imaged by the second imaging unit  7  to extract the degree of influence due to flare or diffraction. For example, the degree of influence due to flare or diffraction may be extracted from a difference between an average pixel value of image data imaged by the first imaging unit  6  and an average pixel value of image data imaged by the second imaging unit  7 . 
     The flare correction unit  33   j  performs processing of subtracting the degree of influence due to flare or diffraction extracted by the flare extraction unit  33   i  from the image data imaged by the second imaging unit  7 . As a result, the image data imaged by the second imaging unit  7  is less likely to be affected by flare or diffraction. 
     As described above, in the fourth embodiment, by referring to the image data imaged by the first imaging unit  6  in the internal processing of the signal processing unit  33 , the sensitivity and resolution of the image data imaged by the second imaging unit  7  can be corrected, and the influence due to flare or diffraction can also be suppressed. In addition, by avoiding unnecessary correction, the processing load of the signal processing unit  33  can be reduced, and the data amount of the image data can be reduced. 
     Fifth Embodiment 
     In the first to fourth embodiments, the example in which the first imaging unit  6  that receives the light of the infrared light wavelength component is provided has been described, but in addition to this, a light emitting unit that emits light of the infrared light wavelength component may be provided. 
       FIG.  13    is a block diagram illustrating a schematic configuration of an electronic device  2   b  according to a fifth embodiment. The electronic device  2   b  in  FIG.  13    includes a light emitting unit  25  and a light emission control unit  26  in addition to the configuration of the electronic device  2  in  FIG.  4   . The light emitting unit  25  emits light in an infrared light wavelength band The light emitting unit  25  is provided on a display surface side of the electronic device  2   b.  For example, the light emitting unit  25  may be provided in the bezel  3   b  portion of the display surface of the electronic device  2   b.    
     The light emission control unit  26  controls the light emission timing of the light emitting unit  25  so that the subject is irradiated with the light emitted by the light emitting unit  25  when the first imaging unit  6  images image data. Since light in the infrared light wavelength band cannot be recognized by human eyes, even if the human is irradiated with the light of the light emitting unit  25 , there is no possibility that the human feels glare. However, it is necessary to perform irradiation with light intensity and continuous irradiation time that do not damage human eyes. 
     Note that, in the present embodiment, it is assumed that the first imaging unit  6  and the second imaging unit  7  image the same subject at the same timing. Since the first imaging unit  6  captures an image of light in the infrared light wavelength band, when a subject is imaged by the first imaging unit  6  in a state where the subject is illuminated with light from the light emitting unit  25 , a pixel value of image data received by the first imaging unit  6  can be increased, and sensitivity can be increased. 
       FIG.  14    is a flowchart illustrating a processing operation when the electronic device  2   b  according to the fifth embodiment performs imaging with the first and second camera modules  4  and  5 . First, it is determined whether or not it is the imaging timing of the first imaging unit  6  and the second imaging unit  7  (step S 41 ). The imaging by the first imaging unit  6  and the second imaging unit  7  is performed in a period in which no image is displayed on the display unit  3 , for example, in a vertical blanking period of the display unit  3 . 
     The process waits at step S 41  until the imaging timing, and at the imaging timing, the light emitting unit  25  starts emitting light (IR light) in the infrared light band (step S 42 ). For example, in a case where the electronic device  2   b  is a smartphone, in order for the user to focus the first and second camera modules  4  and  5  on the subject, if the traveling direction of the light emitted from the light emitting unit  25  coincides with the optical axis direction of the first and second camera modules  4  and  5 , the light from the light emitting unit  25  illuminates the subject even if the user is not particularly conscious. 
     The first imaging unit  6  performs imaging while the light emitting unit  25  is emitting light (step S 43 ). As a result, even in a case where capturing is performed under a situation where the surroundings are dark, the pixel value of the image data imaged by the first imaging unit  6  can be increased. When the imaging by the first imaging unit  6  and the second imaging unit  7  is completed, the light emitting unit  25  stops light emission (step S 44 ). Thereafter, as in the first embodiment and the like, the image data imaged by the second imaging unit  7  is corrected on the basis of the image data imaged by the first imaging unit  6  (step S 45 ). 
     As described above, in the fifth embodiment, since the light in the infrared light wavelength band is received by the first imaging unit  6  in a state where the light emitting unit  25  emits infrared light, the pixel value of the image data imaged by the first imaging unit  6  can be increased, the sensitivity can be increased, and the image data imaged by the second imaging unit  7  can be appropriately corrected on the basis of the image data imaged by the first imaging unit  6  even in a situation where the surroundings are dark. 
     Sixth Embodiment 
     The sixth embodiment is a modification of the fifth embodiment, and enables switching of a light emission wavelength band of light emitted by the light emitting unit  25 . 
     An electronic device  2   b  according to the sixth embodiment has a block configuration similar to that in  FIG.  13   , but the function of the light emitting unit  25  is different. The light emitting unit  25  according to the sixth embodiment includes a plurality of light sources that emits light of different light emission wavelength bands in the infrared light wavelength band. The light emission control unit  26  sequentially switches and controls light emission by the plurality of light sources while the first imaging unit  6  performs imaging. The first imaging unit  6  outputs a plurality of pieces of image data imaged in different light emission wavelength bands. 
       FIG.  15    is a flowchart illustrating a processing operation when the electronic device  2   b  according to the sixth embodiment performs imaging with the first and second camera modules  4  and  5 . First, it is determined whether or not it is the imaging timing of the first imaging unit  6  and the second imaging unit  7  (step S 51 ). At the imaging timing, the light emitting unit  25  selects one of the plurality of light emission wavelength bands in accordance with an instruction from the light emission control unit  26  (step S 52 ), and emits infrared light in the selected light emission wavelength band (step S 53 ). Then, imaging is performed by the first and second imaging units  6  and  7  (step S 54 ), and then light emission of the light emitting unit  25  is stopped (step S 55 ). 
     Next, it is determined whether or not there is infrared light in the light emission wavelength band that has not yet been selected among the light that can be emitted by the light emitting unit  25  (step S 56 ). In a case where there is infrared light that has not yet been selected, the processing in step S 52  and subsequent steps is repeated. When it is determined in step S 56  that the processing in steps S 52  to S 55  has been performed on ail the light that can be emitted by the light emitting unit  25 , the image data imaged by the second imaging unit  7  is corrected on the basis of the image data of the plurality of infrared light wavelength bands imaged by the first imaging unit  6  (step S 57 ). 
     When the first imaging unit  6  performs imaging in a state where illumination is performed in a plurality of different infrared light wavelength bands, there is a possibility that the information captured in the captured image changes little by little, and the image data imaged by the second imaging unit  7  can be corrected more appropriately by correcting the image data imaged by the second imaging unit  7  in comprehensive consideration of these. 
     As described above, in the sixth embodiment, since the light emitting unit  25  includes a plurality of light sources that emits light of different light emission wavelength bands in the infrared light wavelength band, it is possible to obtain a plurality of captured images imaged by the first imaging unit  6  by performing imaging by the first imaging unit  6  in a state where these light sources sequentially emit light. By correcting the image data imaged by the second imaging unit  7  on the basis of the plurality of captured images, more appropriate correction can be performed. 
     Seventh Embodiment 
     In the first to sixth embodiments described above, the example has been described in which the first and second camera modules  4  and  5  capture images of the light having passed through the display surfaces of the electronic device  2 ,  2   a,    2   b.  However, in a case where the first and second camera modules  4  and  5  are arranged in the bezel  3   b  portion of the display surface or in a case where the first and second camera modules  4  and  5  are arranged on the back surface side of the electronic device  2 ,  2   a,    2   b,  the light from the outside is directly incident on the first and second camera modules  4  and  5 , and thus, there is no loss of the light amount due to the subject light passing through the display unit  3 , and no influence due to flare or diffraction. However, in a case where imaging is performed by the second imaging unit  7  under a situation where the surroundings are dark, there is a case where the sensitivity and resolution of the captured image decrease. Furthermore, in a case where imaging is performed by the second imaging unit  7  under a situation of receiving strong sunlight, the captured image is likely to be affected by flare or diffraction. In such a case, by correcting the image data imaged by the second imaging unit  7  on the basis of the image data imaged by the first imaging unit  6  that receives light in the infrared light wavelength band, sensitivity and resolution can be improved, and the influence due to flare or diffraction can be suppressed. Therefore, the electronic device  2 ,  2   a,    2   b  according to the first to sixth embodiments can also be applied to a case where the first and second camera modules  4  and  5  are arranged in the bezel  3   b  portion of the display surface or a case where the first and second camera modules  4  and  5  are arranged on the back surface side of the electronic device  2 ,  2   a,    2   b.    
     Eighth Embodiment 
     As specific candidates for the electronic device  2  having the configuration described in the first to seventh embodiments, various candidates are conceivable. For example,  FIG.  16    is a plan view in a case where the electronic device  2  in the first to seventh embodiments is applied to a capsule endoscope  50 . The capsule endoscope  50  of  FIG.  16    includes, for example, in a housing  51  having hemispherical both end surfaces and a cylindrical central portion, a camera (ultra-small camera)  52  for capturing an image in a body cavity, a memory  53  for recording image data imaged by the camera  52 , and a wireless transmitter  55  for transmitting the recorded image data to the outside via an antenna  54  after the capsule endoscope  50  is discharged to the outside of the subject. 
     Further, in the housing  51 , a central processing unit (CM  56  and a coil (magnetic force/current conversion coil)  57  are provided. The CPU  56  controls capturing by the camera  52  and a data accumulation operation in the memory&#39;  53 , and controls data transmission from the memory  53  to a data reception. device (not illustrated) outside the housing  51  by the wireless transmitter  55 . The coil  57  supplies power to the camera  52 , the memory  53 , the wireless transmitter  55 , the antenna  54 , and a light source  52   b  to be described later. 
     Furthermore, the casing  51  is provided with a magnetic (reed) switch  58  for detecting, when the capsule endoscope  50  is set in the data reception device, this setting. The CPU  56  supplies power from the coil  57  to the wireless transmitter  55  when the reed switch  58  detects the setting to the data reception device and data transmission becomes possible. 
     The camera  52  includes, for example, an imaging element  52   a  including an objective optical system for capturing an image in a body cavity, and a plurality of light sources  52   b  for illuminating the body cavity. Specifically, the camera  52  includes, as the light source  52   b,  for example, a complementary metal oxide semiconductor (CMOS) sensor including a light emitting diode (LED), a charge coupled device (CCD), or the like. 
     Application Example of Imaging Device  1  and Electronic Device  2  According to Present Disclosure 
     First Application Example 
     The imaging device  1  and the electronic device  2  according to the present disclosure can be used for various purposes.  FIGS.  16 A and  165    are diagrams illustrating an internal configuration of a vehicle  100  which is a first application example of the electronic device  2  including the imaging device  1  according to the present disclosure.  FIG.  16 A  is a view illustrating an internal state of the vehicle  100  from a rear side to a front side of the vehicle  100 , and  FIG.  16 B  is a view illustrating an internal state of the vehicle  100  from an oblique rear side to an oblique front side of the vehicle  100 . 
     The vehicle  100  of  FIGS.  16 A and  16 B  has a center display  101 , a console display  102 , a head-up display  103 , a digital rear mirror  104 , a steering wheel display  105 , and a rear entertainment display  106 . 
     The center display  101  is disposed on a dashboard  107  at a position facing the driver&#39;s seat  108  and the passenger seat  109 .  FIG.  16    illustrates an example of the center display  101  having a horizontally long shape extending from the driver&#39;s seat  108  side to the passenger seat  109  side, but the screen size and the arrangement location of the center display  101  are arbitrary. The center display  101  can display information detected by various sensors  5 . As a specific example, the center display  101  can display a captured image captured by the image sensor, a distance image to an obstacle in front of or on a side of the vehicle measured by a ToF sensor  5 , a passenger&#39;s body temperature detected by the infrared sensor  5 , and the like. The center display  101  can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication/identification-related information, or entertainment-related information. 
     The safety-related information is information such as doze detection, looking-away detection, mischief detection of a child riding together, presence or absence of wearing of a seat belt, and detection of leaving of an occupant, and is, for example, information detected by the sensor  5  disposed to overlap the back surface side of the center display  101 . The operation-related information detects a gesture related to the operation of the occupant using the sensor  5 . The detected gesture may include operation of various equipment in the vehicle  100 . For example, operations of air conditioning equipment, a navigation device, an AV device, a lighting device, and the like are detected. The life log includes a life log of all the occupants. For example, the life log includes an action record of each occupant in the vehicle. By acquiring and storing the life log, it is possible to confirm the state of the occupant at the time of the accident. The health-related information detects the body temperature of the occupant using a temperature sensor  5 , and estimates the health state of the occupant on the basis of the detected body temperature. Alternatively, the face of the occupant may be imaged using an image sensor, and the health state of the occupant may be estimated from the imaged facial expression. Furthermore, a conversation may be made with the occupant in an automatic voice, and the health state of the occupant may be estimated on the basis of the answer content of the occupant. The authentication/identification-related information includes a keyless entry function of performing face authentication using the sensor  5 , a function of automatically adjusting a seat height and a position in face identification, and the like. The entertainment-related information includes a function of detecting operation information of the AV device by the occupant using the sensor  5 , a function of recognizing the face of the occupant by the sensor  5  and providing content suitable for the occupant by the AV device, and the like. 
     The console display  102  can be used to display the life log information, for example. The console display  102  is disposed near a shift lever  111  of a center console  110  between the driver&#39;s seat  108  and the passenger seat  109 . The console display  102  can also display information detected by the various sensors  5 . In addition, the console display  102  may display an image of the periphery of the vehicle imaged by the image sensor, or may display a distance image to an obstacle in The periphery of the vehicle. 
     The head-up display  103  is virtually displayed behind a windshield  112  in front of the driver&#39;s seat  108 . The head-up display  103  can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication/identification-related information, or entertainment-related information. Since the head-up display  103  is virtually disposed in front of the driver&#39;s seat  108  in many cases, it is suitable for displaying information directly related to the operation of the vehicle  100  such as the speed of the vehicle  100  and the remaining amount of fuel (battery). 
     The digital rear mirror  104  can not only display the rear of the vehicle  100  but also display the state of the occupant in the rear seat, and thus can be used to display the life log information, for example, by disposing the sensor  5  to be superimposed on the back surface side of the digital rear mirror  104 . 
     The steering wheel display  105  is disposed near the center of a steering wheel  113  of the vehicle  100 . The steering wheel display  105  can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication/identification-related information, or entertainment-related information. In particular, since the steering wheel display  105  is close to the driver&#39;s hand, it is suitable for displaying life log information such as the body temperature of the driver, or for displaying information related to the operation of an AV device, air conditioning equipment, or the like. 
     The rear entertainment display  106  is attached to the back side of the driver&#39;s seat  108  and the passenger seat  109 , and is for viewing by an occupant in the rear seat. The rear entertainment display  106  can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication/identification-related information, or entertainment-related information. In particular, since the rear entertainment display  106  is in front of the occupant in the rear seat, information related to the occupant in the rear seat is displayed. For example, information regarding the operation of the AV device or air conditioning equipment may be displayed, or a result of measuring the body temperature or the like of the occupant in the rear seat by the temperature sensor  5  may be displayed. 
     As described above, by disposing the sensor  5  on the back surface side of the display unit  3  in an overlapping manner, it is possible to measure the distance to an object existing in the surroundings. Optical distance measurement methods are roughly classified into a passive type and an active type. In the passive type, distance measurement is performed by receiving light from an object without projecting light from the sensor  5  to the object. The passive type includes a lens focus method, a stereo method, a monocular vision method, and the like. In the active type, light is projected onto an object, and reflected light from the object is received by the sensor  5  to measure a distance. The active type includes an optical radar method, an active stereo method, an illuminance difference stereo method, a moire topography method, an interference method, and the like. The imaging device  1  according to the present disclosure is applicable to any of these types of distance measurement. By using the sensor  5  disposed to overlap the back surface side of the display unit  3  according to the present disclosure, the above-described passive or active distance measurement can be performed. 
     Second Application Example 
     The imaging device  1  according to the present disclosure is applicable not only to various displays used in vehicles but also to displays mounted on various electronic devices  2 . 
       FIG.  17 A  is a front view of a digital camera  120  as a second application example of the electronic device  2 , and  FIG.  17 B  is a rear view of the digital camera  120 . The digital camera  120  in  FIGS.  17 A and  17 B  illustrates an example of a single-lens reflex camera in which a lens  121  is replaceable, but is also applicable to a camera in which the lens  121  is not replaceable. 
     In the camera of  FIGS.  17 A and  17 B , when the photographer looks into an electronic viewfinder  124  to determine the composition while holding a grip  123  of a camera body  122 , and presses a shutter  125  while adjusting the focus, captured data is stored in the memory in the camera. As illustrated in  FIG.  17 B , a monitor screen  126  that displays captured data and the like, a live image, and the like, and an electronic viewfinder  124  are provided on the back side of the camera. In addition, there is also a case where a sub screen for displaying setting information such as a shutter speed and an exposure value is provided on the upper surface of the camera. 
     By disposing the sensor  5  so as to overlap the back surface side of the monitor screen  126 , the electronic viewfinder  124 , the sub screen, and the like used for the camera, the camera can be used as the imaging device  1  according to the present disclosure. 
     Third Application Example 
     The imaging device  1  and the electronic device  2  according to the present disclosure are also applicable to a head mounted display (hereinafter, referred to as an HMD). The HMD can be used for virtual reality (VR), augmented reality (AR), mixed reality (MR), substitutional reality (SR), or the like. 
       FIG.  18 A  is an external view of an HMD  130  which is a third application example of the electronic device  2 . The HMD  130  of  FIG.  18 A  has an attachment member  131  for attachment so as to cover human eyes. The attachment member  131  is hooked and fixed to a human ear, for example. A display device  132  is provided inside the HMD  130 , and a wearer of the HMD  130  can visually recognize a stereoscopic image and the like with the display device  132 . The HMD  130  includes, for example, a wireless communication function, an acceleration sensor, and the like, and can switch a stereoscopic image and the like displayed on the display device  132  in accordance with the posture, gesture, and the like of the wearer. 
     Furthermore, a camera may be provided in the HMD  130  to capture an image around the wearer, and an image obtained by combining the captured image of the camera and the image generated by the computer may be displayed on the display device  132 . For example, a camera is disposed to be superimposed on the back surface side of the display device  132  visually recognized by the wearer of the HMD  130 , the periphery of the eye of the wearer is captured by the camera, and the captured image is displayed on another display provided on the outer surface of the HMD  130 , so that a person around the wearer can grasp the expression of the face of the wearer and the motion of the eye in real time. 
     Note that various types of the HMD  130  are conceivable. For example, as illustrated in  FIG.  18 B , the imaging device  1  and the electronic device  2  according to the present disclosure can also be applied to a smart glass  130   a  that displays various types of information on eyeglasses  134 . The smart glass  130   a  in  FIG.  18 B  includes a main body  135 , an arm  136 , and a lens barrel portion  137 . The main body  135  is connected to the arm  136 . The main body  135  is detachable from the eyeglasses  134 . The main body  135  incorporates a control board and a display unit for controlling the operation of the smart glass  130   a.  The main body  135  and the lens barrel are connected to each other via the arm  136 . The lens barrel portion  137  emits image light emitted from the main body  135  through the arm  136  toward a lens  138  of the eyeglasses  134 . This image light enters human eyes through the lens  138 . The wearer of the smart glass  130   a  in  FIG.  18 B  can visually recognize not only the surrounding situation but also various pieces of information emitted from the lens barrel portion  137 , similarly to normal eyeglasses. 
     Fourth Application Example 
     The imaging device  1  and the electronic device  2  according to the present disclosure are also applicable to a television device (hereinafter, TV). Recent TVs tend to make the frame as small as possible from the viewpoint of downsizing and design property. Therefore, in a case where a camera for capturing an image of a viewer is provided on a TV, it is desirable to dispose the camera so as to overlap the back surface side of a display panel  2  of the TV. 
       FIG.  19    is an external view of a TV  140  which is a fourth application example of the electronic device  2 . In the TV  140  of  FIG.  19   , the frame is minimized, and almost the entire area on the front side is a display area. The TV  140  incorporates a sensor  5  such as a camera for capturing an image of a viewer. The sensor  5  in  FIG.  19    is disposed on a back side of a part (for example, a broken line part) in the display panel  2 . The sensor  5  may be an image sensor module, or various sensors such as a sensor for face authentication, a sensor for distance measurement, and a temperature sensor can be applied, and a plurality of types of sensors may be arranged on the back surface side of the display panel  2  of the TV  140 . 
     As described above, according to the imaging device and the electronic device  2  of the present disclosure, since an image sensor module  9  can be disposed to overlap the back surface side of the display panel  2 , it is not necessary to dispose a camera or the like in the frame, the TV  140  can be downsized, and there is no possible that the design is impaired by the frame. 
     Fifth Application Example 
     The imaging device  1  and the electronic device  2  according to the present disclosure are also applicable to a smartphone and a mobile phone.  FIG.  20    is an external view of a smartphone  150  which is a fifth application example of the electronic device  2 . In the example of  FIG.  20   , a display surface  2   z  spreads close to the outer size of the electronic device  2 , and the width of a bezel  2   y  around the display surface  2   z  is set to several mm or less. Normally, a front camera is often mounted on the bezel  2   y,  but in  FIG.  20   , as indicated by a broken line, the image sensor module  9  functioning as a front camera is disposed on the back surface side of the substantially central portion of the display surface  2   z,  for example. By providing the front camera on the back surface side of the display surface  2   z  in this manner, it is not necessary to dispose the front camera in the bezel  2   y,  and the width of the bezel  2   y  can be narrowed. 
     Note that, the present technology can also adopt the following configurations. 
     (1) An electronic device including: 
     a display unit; 
     a first imaging unit that is disposed on a side opposite to a display surface of the display unit and is capable of capturing an image of light in an infrared light wavelength band that has passed through the display unit; 
     a second imaging unit that is disposed on a side opposite to the display surface of the display unit and is capable of capturing an image of light in a visible light wavelength band that has passed through the display unit; and 
     a correction unit that corrects image data imaged by the second imaging unit on the basis of image data imaged by the first imaging unit. 
     (2) The electronic device according to (1), in which the correction unit corrects sensitivity of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit. 
     (3) The electronic device according to (2), further including a learning unit that learns a correlation between sensitivity of the image data imaged by the first imaging unit and sensitivity of the image data imaged by the second imaging unit, in which 
     the correction unit corrects the sensitivity of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit with reference to a learning result in the learning unit. 
     (4) The electronic device according to (1), in which the correction unit corrects resolution of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit. 
     (5) The electronic device according to (4), further including a learning unit that learns a correlation between resolution of the image data imaged by the first imaging unit and the resolution of the image data imaged by the second imaging unit, in which 
     the correction unit corrects the resolution of the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit with reference to a learning result in the learning unit. 
     (6) The electronic device according to (1), in which the correction unit corrects at least one of a flare component or a diffracted light component included in the image data imaged by the second imaging unit on the basis of the image data imaged by the first imaging unit. 
     (7) The electronic device according to (6), further including 
     a learning unit that learns a correlation between at least one of a flare component or a diffracted light component included in the image data imaged by the first imaging unit and at least one of a flare component or a diffracted light component included in the image data imaged by the second imaging unit, in which the correction unit corrects at least one of the flare component or the diffracted light component included in the image data imaged by the second imaging unit on a basis of the image data imaged by the first imaging unit with reference to a learning result in the learning unit. 
     (8) The electronic device according to (7), further including: 
     a reference determination unit that determines whether or not at least one of sensitivity, resolution, a flare component, or a diffracted light component of the image data imaged by the second imaging unit satisfies a predetermined first reference; 
     an imaging start instruction unit that starts imaging by the first imaging unit when the reference determination unit determines that the first reference is not satisfied; and 
     a correction procedure determination unit that determines whether or not to perform correction by the correction unit and a type of image data to be a reference of correction when correction by the correction unit is performed on the basis of a result of comparing at least one of sensitivity, resolution, a flare component, or a diffracted light component between the image data imaged by the first imaging unit and the image data imaged by the second imaging unit. 
     (9) The electronic device according to (8), in which when the type of image data to be a reference of correction is determined by the correction procedure determination unit, the learning unit learns a correlation between at least one of sensitivity, resolution, a flare component, or a diffracted light component of the determined image data and at least one of the sensitivity, the resolution, the flare component, and the diffracted light component of the image data imaged by the second imaging unit. 
     (10) The electronic device according to any one of (7) to (9), further including: 
     a sensor that detects at least one of a shape or a color of an object; 
     a reliability estimation unit that estimates reliability of learning by the learning unit; 
     an object identification determination unit that determines whether or not the object can be identified on the basis of detection data of the sensor in a case where the reliability estimated by the reliability estimation unit is equal to or less than a predetermined second reference; and 
     a color specification determination unit that determines whether or not the color of the object identified by the sensor can be specified in a case where the object identification determination unit determines that the object can be identified, and 
     in a case where the color specification determination unit determines that the color of the object can be specified, the correction unit corrects the image data imaged by the second imaging unit so as to approach the specified color. 
     (11) The electronic device according to any one of (1) to (10), in which the correction unit sets a noise removal degree of a pixel region having a luminance change equal to or less than a predetermined reference value in the image data imaged by the second imaging unit to be higher than a noise removal degree of a pixel region having a luminance change larger than the reference value in the image data. 
     (12) The electronic device according to any one of (1) to (11), further including: 
     a light emitting unit that emits light in an infrared light wavelength band; and 
     a light emission control unit that controls a light emission timing of the light emitting unit such that a subject is illuminated with light emitted by the light emitting unit when image data is imaged by the first imaging unit. 
     (13) The electronic device according to (12), in which 
     the light emitting unit includes a plurality of light sources that emits light in light emission wavelength bands different from each other in the infrared light wavelength band, 
     the light emission control unit sequentially switches and controls light emission by the plurality of light sources while the first imaging unit performs imaging, 
     the first imaging unit outputs a plurality of pieces of image data imaged in emission light wavelength bands different from each other, and 
     the correction unit corrects the image data imaged by the second imaging unit on the basis of the plurality of pieces of image data. 
     (14) The electronic device according to (12) or (13), in which the light emitting unit is disposed on a display surface side of the display unit. 
     (15) The electronic device according to any one of (1) to (14), in which at least one of the first imaging unit or the second imaging unit includes a pixel that captures an image of light in an infrared light wavelength band and a pixel that captures an image of light in a visible light wavelength band. 
     (16) The electronic device according to (15), in which the first imaging unit has sensitivity to light of 550 nm or more. 
     (17) The electronic device according to any one of (1) to (16), in which the correction unit increases the degree of correction toward a shorter wavelength side with respect to the image data imaged by the second imaging unit. 
     (18) The electronic device according to any one of (1) to (17), in which the first imaging unit includes a photoelectric conversion unit arranged to be longer in a normal direction of a light incident surface than the second imaging unit. 
     (19) The electronic device according to any one of (1) to (18), in which 
     an area of the first imaging unit in a light incident surface direction per pixel is larger than an area of the second imaging unit in a light incident surface direction per pixel, and 
     an area of all the pixels of the first imaging unit in the light incident surface direction is smaller than an area of all the pixels of the second imaging unit in the light incident surface direction. 
     (20) An imaging device including: a first imaging unit that is disposed on a side opposite to a display surface of a display unit and is capable of capturing an image of light in an infrared light wavelength band; 
     a second imaging unit that is disposed on a side opposite to a display surface of the display unit and is capable of capturing an image of light in a visible light wavelength band; and 
     a correction unit that corrects image data imaged by the second imaging unit on the basis of image data imaged by the first imaging unit. 
     (21) An imaging device including: 
     a first imaging unit capable of capturing an image of light in an infrared light wavelength band; 
     a second imaging unit capable of capturing an image of light is a visible light wavelength band; and 
     a correction unit that corrects image data imaged by the second imaging unit on the basis of image data imaged by the first imaging unit. 
     Aspects of the present disclosure are not limited to the above-described embodiments, but include various modifications that can be conceived by a person skilled in the art, and the effects of the present disclosure are not limited to the above-described contents. That is, various additions, modifications, and partial deletions can be made without departing from the conceptual idea and gist of the present disclosure derived from the contents defined in the claims and equivalents thereof. 
     REFERENCE SIGNS LIST 
     
         
           1  Imaging device 
           2 ,  2   a,    2   b  Electronic device 
           3  Display unit 
           3   a  Display surface 
           3   b  Bezel 
           4  Camera module 
           5  Camera module 
           6  First imaging unit 
           7  Second imaging unit 
           8  First optical system 
           9  Second optical system 
           11  Semiconductor substrate 
           12   a  First photoelectric conversion unit 
           12   b  Second photoelectric conversion unit 
           13  Element isolation layer 
           14  Flattening layer 
           15   a  On-chip lens 
           15   b  On-chip lens 
           16  Color filter layer 
           17  Read circuit 
           21  Application processor 
           22  video signal generation unit 
           23  A/C conversion unit 
           24  Display control unit 
           31  First A/D conversion unit 
           32  Second A/D conversion unit 
           33  Signal processing unit 
           100  Vehicle 
           101  Center display 
           102  Console display 
           103  Head-up display 
           104  Digital rear mirror 
           105  Steering wheel display 
           106  Rear entertainment display 
           107  Dashboard 
           108  Driver&#39;s seat 
           109  Passenger seat 
           110  Center console 
           111  Shift lever 
           112  Windshield 
           113  Steering wheel 
           120  Digital camera 
           121  Lens 
           122  Camera body 
           123  Grip 
           124  Electronic viewfinder 
           125  Shutter 
           126  Monitor screen 
           130  Smart glass 
           131  Mounting member 
           132  Display device 
           134  Glasses 
           135  Main body 
           136  Arm 
           137  Lens barrel portion 
           136  Lens 
           150  Smartphone