Light filtering device, camera module and electronic device

Abstract

The application discloses a light filtering device, a camera module and electronic equipment. The disclosed light filtering device comprises a circuit substrate, a light transmission piece and a driving piece. The light transmission piece comprises a light transmission shell and a fluid medium arranged in the light transmission shell. The driving piece is arranged on the circuit substrate and connected with the light transmission shell. The driving piece drives the fluid medium to fluctuate through the light transmission shell, so that the light transmission piece forms an ultrasonic grating to adjust the refractive index of the light transmission piece. The above scheme can solve the problem of poor shooting quality of the camera module in the related art.

Description

Technical Field

[0001] This invention relates to the field of camera module technology, and more particularly to a light filtering device, a camera module, and an electronic device. Background Technology

[0002] With the development of electronic devices, people now have increasingly higher requirements for the image quality of photographs taken by these devices. In related technologies, camera modules typically use RGB color filter arrays to detect the intensity of each light component to achieve color acquisition.

[0003] For a camera module to display complete colors, it needs to possess RGB (R, G, B) color information simultaneously. Each pixel in an RGB color filter array only contains information for one of these three colors. Therefore, when reconstructing the color information of a single pixel, taking a G pixel as an example, it needs to extract color information from surrounding R and B pixels, and then synthesize the RGB color information using a specific algorithm to display the color information at that pixel. However, the color information reconstructed in this way usually deviates from the actual color information, thus affecting the image quality captured by the camera module. Summary of the Invention

[0004] This invention discloses a light filtering device, a camera module, and an electronic device to solve the problem of poor shooting quality of camera modules in related technologies.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0006] In a first aspect, this application discloses a light filtering device, which includes a circuit board, a light-transmitting element, and a driving element, wherein...

[0007] The light-transmitting element includes a light-transmitting shell and a fluid medium disposed within the light-transmitting shell. The driving element is disposed on the circuit board and connected to the light-transmitting shell. The driving element is used to drive the fluid medium to fluctuate through the light-transmitting shell, so that the light-transmitting element forms an ultrasonic grating to adjust the refractive index of the light-transmitting element.

[0008] Secondly, this application also discloses a camera module, which includes the light filtering device described in the first aspect.

[0009] Thirdly, this application also discloses an electronic device, which includes the camera module described in the second aspect.

[0010] The technical solution adopted in this invention can achieve the following technical effects:

[0011] Since the wavelength of light allowed to pass through the light-transmitting element can be controlled by controlling the refractive index of the light-transmitting element, the filtering function of the light-transmitting element can be realized. The filtering device disclosed in this application sets the light-transmitting element as a structure including a light-transmitting shell and a fluid medium disposed within the light-transmitting shell, so that the driving element drives the fluid medium to fluctuate through the light-transmitting shell. Thus, when the fluid medium fluctuates periodically, the light-transmitting element forms an ultrasonic grating. Furthermore, by changing the fluctuation period of the fluid medium driven by the driving element, the refractive index of the light-transmitting element can be changed to form ultrasonic gratings with different structures, thereby allowing different types of light to pass through.

[0012] When a light filter is applied to a camera module, the oscillation period of the fluid medium driven by the driving component can be adjusted to allow only red, green, or blue light to pass through. During image capture, the light filter can be adjusted so that each of the three light sources (red, green, and blue) passes through and is exposed once. This allows for image formation of the object using red, blue, and green light separately, ensuring that each pixel in the camera module receives each of these light sources once. This results in better reproduction of actual color information and improved image quality. Since each pixel can receive red, blue, and green light, the amount of light entering each pixel is increased, which in turn allows for an increase in the number of pixels and improved resolution. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the camera module disclosed in an embodiment of the present invention;

[0014] Figure 2 This is a partially enlarged schematic diagram of the filtering device disclosed in an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram showing the distribution of the filter device and photosensitive chip disclosed in an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the transmission spectrum formed under different periodically changing electrical signals as disclosed in an embodiment of the present invention;

[0017] Figure 5 These are images showing the deformation profile of the piezoelectric drive device disclosed in the embodiments of the present invention under different periodically changing electrical signals.

[0018] Explanation of reference numerals in the attached figures:

[0019] A-Filter Device

[0020] 100-Circuit Board,

[0021] 200-Transparent parts,

[0022] 300-Driver

[0023] 400 - Photosensitive chip, 410 - Lens group, 420 - Photodiode group. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] The technical solutions disclosed in the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Please refer to Figures 1 to 5 This invention discloses a light filtering device, which includes a circuit board 100, a light-transmitting element 200, and a driving element 300.

[0027] The light-transmitting element 200 includes a light-transmitting shell and a fluid medium disposed within the light-transmitting shell. The driving element 300 is disposed on the circuit board 100 and is connected to the light-transmitting shell. The driving element 300 is used to drive the fluid medium to fluctuate through the light-transmitting shell, so that the light-transmitting element 200 forms an ultrasonic grating to adjust the refractive index of the light-transmitting element 200.

[0028] It should be noted that the driving component 300 can be an ultrasonic driving component, which can drive the fluid medium to fluctuate through the light-transmitting shell so that the light-transmitting component 200 forms an ultrasonic grating.

[0029] Since the wavelength of light allowed to pass through the light-transmitting element 200 can be controlled by controlling the refractive index of the light-transmitting element 200, the filtering function of the light-transmitting element 200 can be realized. The filtering device disclosed in this application sets the light-transmitting element 200 into a structure including a light-transmitting shell and a fluid medium disposed within the light-transmitting shell, so that the driving element 300 drives the fluid medium to fluctuate through the light-transmitting shell. Thus, when the fluid medium fluctuates periodically, the light-transmitting element 200 forms an ultrasonic grating. Furthermore, by changing the fluctuation period of the fluid medium driven by the driving element 300, the refractive index of the light-transmitting element 300 can be changed to form ultrasonic gratings with different structures, thereby allowing different types of light to pass through.

[0030] When a light filter is applied to a camera module, the oscillation period of the fluid medium driven by the driving component 300 can be adjusted to allow only red light, green light, or blue light to pass through. This allows the camera module to take a picture by adjusting the light-transmitting component 200 so that each of the three light sources (red, green, and blue) passes through and is exposed once. This enables the object to be imaged separately using red, blue, and green light, ensuring that each pixel in the camera module receives red, blue, and green light once. This results in better reproduction of actual color information and improved image quality. Since each pixel unit can receive red, blue, and green light, the amount of light received by each pixel unit can be increased, which in turn facilitates increasing the number of pixel units and improving resolution.

[0031] Specifically, the driving element 300 can be a piezoelectric driving element. When a periodically changing electrical signal is applied to the piezoelectric driving element, the piezoelectric driving element will deform according to the changes in the applied periodically changing electrical signal to drive the fluid medium to fluctuate. It should be noted that when a periodically changing electrical signal is applied to the piezoelectric driving element, the deformation of the piezoelectric driving element will also change periodically, thereby causing the fluid medium to fluctuate.

[0032] The filtering device disclosed in this application sets the driving element 300 as a piezoelectric driving element, so that the piezoelectric driving element can deform according to the changes of the periodically changing electrical signal to drive the fluid medium to fluctuate, thereby making the structure of the driving element 300 simpler.

[0033] Of course, the driving component 300 can also be a magnetic driving component, a micro drive motor, etc. The embodiments of this application do not impose specific restrictions on the type of driving component 300.

[0034] It should be noted that the electrical signal can be a voltage signal or a current signal input to the piezoelectric actuator, etc.

[0035] In specific embodiments, the refractive index of the light-transmitting element 200 differs when different periodically varying electrical signals are input to the piezoelectric actuator. For example, the refractive index of the light-transmitting element 200 differs when the electrical signal input to the piezoelectric actuator varies with a first period and when the electrical signal input to the piezoelectric actuator varies with a second period, thus resulting in different amounts of light passing through the light-transmitting element 200. Figure 4 As shown, Figure 4A schematic diagram of the light transmission spectrum formed by the light-transmitting element 200 under different periodically changing electrical signals is disclosed. In the diagram, 'a' represents the wavelength of light allowed to pass under a first periodically changing electrical signal (whose fluctuation frequency in the light-transmitting element is ultrasonic frequency 1); 'b' represents the wavelength of light allowed to pass under a second periodically changing electrical signal (whose fluctuation frequency in the light-transmitting element is ultrasonic frequency 2); and 'c' represents the wavelength of light allowed to pass under a third periodically changing electrical signal (whose fluctuation frequency in the light-transmitting element is ultrasonic frequency 3). The frequencies and signal intensities of the first, second, and third periodically changing electrical signals can be different. Figure 5 The deformation profiles of the piezoelectric actuator under different periodically varying electrical signals are shown.

[0036] To make the structure of the light filtering device more compact, the circuit board 100 can optionally be a hollow frame structure, the light-transmitting element 200 can be disposed inside the frame structure, one end of the driving element 300 can be connected to the frame structure, and the other end of the driving element 300 can be connected to the light-transmitting housing.

[0037] The filtering device disclosed in this application sets the circuit board 100 as a frame structure, so that the light-transmitting element 200 can be disposed within the frame structure. The light-transmitting element 200 can be connected to the circuit board 100 by the driving element 300, which is conducive to the compact design of the filtering device.

[0038] In one optional embodiment, there may be multiple driving elements 300, which may be arranged in an array, spaced apart from each other, surrounding the light-transmitting element 200.

[0039] The filtering device disclosed in this application improves the driving capability of the light-transmitting element 200 by using multiple driving elements 300. Furthermore, the multiple driving elements 300 can cooperate to adjust the refractive index of local areas of the light-transmitting element 200, thereby enabling adjustment of individual pixels when the filtering device is applied to a camera module.

[0040] It should be noted that each driving component 300 can individually drive the fluctuation state of the fluid medium at the corresponding position of the light-transmitting component 200, thereby adjusting the corresponding local area of ​​the light-transmitting component 200, that is, different positions of the light-transmitting component 200 can have different refractive indices.

[0041] To make the filter device more compact, the drive unit 300 can optionally be electrically connected to the circuit board 100, thus eliminating the need for a separate power supply for the drive unit and contributing to the compactness of the filter device. When the filter device is used in a camera module, the camera of the camera module can also be electrically connected to the circuit board, further contributing to the compactness of the camera module.

[0042] Specifically, the fluid medium can be a liquid. The fluid medium can be a liquid with a high refractive index or a specific refractive index. A high refractive index greater than 1.5 has a significant modulating effect on light.

[0043] Of course, the fluid medium can also be a gas, and this application does not impose specific restrictions on the type of fluid medium.

[0044] Optionally, the light-transmitting shell can be a flexible shell, which makes the light-transmitting shell more resilient and less prone to breakage.

[0045] This application also discloses a camera module, which includes the filter device A disclosed in the above embodiments.

[0046] The camera module disclosed in this application, by setting the filter device A disclosed in the above embodiments, can adjust the oscillation period of the fluid medium driven by the driving component 300, thereby adjusting the light-transmitting component 200 to allow only red light, only green light, or only blue light to pass through. Thus, when the camera module takes a picture, the light-transmitting component 200 can be adjusted so that red, green, and blue light each pass through and are exposed once, allowing the object to be imaged using red, blue, and green light respectively. This ensures that each pixel in the camera module receives red, blue, and green light once, thereby better reproducing actual color information and improving the shooting quality of the camera module. Since each pixel unit can receive red, blue, and green light, the amount of light received by each pixel unit can be increased, which is beneficial for increasing the number of pixel units and improving resolution.

[0047] To better focus the light, the camera module may optionally include a photosensitive chip 400, which may include a lens group 410 and a photodiode group 420. The lens group 410 may be located on the photosensitive side of the photodiode group 420, and the filter device A may be located on the side of the lens group 410 away from the photodiode group 420.

[0048] The camera module disclosed in this application configures the photosensitive chip 400 to include a lens group 410 and a photodiode group 420, such that the lens group 410 is located on the photosensitive side of the photodiode group 420, and the filter device A is located on the side of the lens group 410 away from the photodiode group 420, so that the light filtered by the filter device A can be better focused onto the photodiode group 420.

[0049] In one specific embodiment, the driving element 300 can be used to drive the fluid medium to fluctuate, thereby adjusting the periodic change of the refractive index of the light-transmitting element 200. In each cycle of the refractive index change of the light-transmitting element 200, the light-transmitting element 200 can individually allow red light, green light and blue light to pass through once each.

[0050] The camera module disclosed in this application allows red light, green light, and blue light to pass through the light-transmitting element 200 individually once each during each cycle of the refractive index change of the light-transmitting element 200, thereby enabling each pixel of the camera module to receive red light, green light, and blue light once.

[0051] This application also discloses an electronic device, which includes the camera module disclosed in the above embodiments.

[0052] The electronic device disclosed in this application embodiment, equipped with the camera module disclosed in the above embodiment, can adjust the oscillation period of the fluid medium driven by the driving component 300, thereby adjusting the light-transmitting component 200 to allow only red light, only green light, or only blue light to pass through. Thus, when the camera module takes a picture, the light-transmitting component 200 can be adjusted so that red, green, and blue light each pass through and are exposed once, allowing the object to be imaged using red, blue, and green light respectively. This ensures that each pixel in the camera module receives red, blue, and green light once, thereby better reproducing actual color information and improving the image quality of the camera module. Since each pixel unit can receive red, blue, and green light, the amount of light received by each pixel unit can be increased, which is beneficial for increasing the number of pixel units and improving resolution.

[0053] The above embodiments of the present invention focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0054] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A filtering device, characterized in that, It includes a circuit board (100), a light-transmitting element (200), and a driving element (300), wherein, The light-transmitting element (200) includes a light-transmitting shell and a fluid medium disposed within the light-transmitting shell. The driving element (300) is disposed on the circuit board (100) and is connected to the light-transmitting shell. It is used to drive the fluid medium to fluctuate periodically through the light-transmitting shell, so that the light-transmitting element (200) forms an ultrasonic grating. When the fluctuation period of the fluid medium driven by the driving element (300) is changed, the refractive index of the light-transmitting element (200) is changed, and the wavelength of the light allowed to pass through the light-transmitting element (200) is controlled so that different light rays can pass through the light-transmitting element (200). The circuit board (100) is a hollow frame structure. The light-transmitting element (200) is disposed inside the frame structure. One end of the driving element (300) is connected to the frame structure, and the other end of the driving element (300) is connected to the light-transmitting shell.

2. The filtering device according to claim 1, characterized in that, The driving element (300) is a piezoelectric driving element. When a periodically changing electrical signal is applied to the piezoelectric driving element, the piezoelectric driving element deforms according to the change of the applied periodically changing electrical signal to drive the fluid medium to fluctuate.

3. The filtering device according to claim 2, characterized in that, The refractive index of the light-transmitting element (200) varies when different periodically changing electrical signals are applied to the piezoelectric drive.

4. The filtering device according to claim 1, characterized in that, There are multiple driving elements (300), and the multiple driving elements (300) are arranged in an array with intervals and around the light-transmitting element (200).

5. The filtering device according to claim 1, characterized in that, The driving component (300) is electrically connected to the circuit board (100).

6. The filtering device according to claim 1, characterized in that, The fluid medium is a liquid.

7. The filtering device according to claim 1, characterized in that, The light-transmitting shell is a flexible shell.

8. A camera module, characterized in that, Includes the filter device (A) according to any one of claims 1 to 7.

9. The camera module according to claim 8, characterized in that, The camera module also includes a photosensitive chip (400), which includes a lens group (410) and a photodiode group (420). The lens group (410) is located on the photosensitive side of the photodiode group (420), and the filter device (A) is located on the side of the lens group (410) away from the photodiode group (420).

10. The camera module according to claim 8, characterized in that, The driving element (300) is used to drive the fluid medium to fluctuate in order to adjust the periodic change of the refractive index of the light-transmitting element (200), wherein, in each cycle of the refractive index change of the light-transmitting element (200), the light-transmitting element (200) can individually allow red light, green light and blue light to pass through once each.

11. An electronic device, characterized in that, Includes the camera module as described in any one of claims 8 to 10.

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