Multi-channel color temperature sensor based on micro-nano structure
By integrating the microlens array, Bayer filter layer and color temperature filter layer on the image sensor, and using the micro-nano structure array to change the transmission spectrum of the color temperature filter layer, the shortcomings of traditional color temperature sensors in color temperature calculation accuracy and channel increase cost are solved. , realizes high-precision and low-cost multi-channel color temperature measurement and correction.
Patent Information
- Application Number
- CN202310965444.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-02
- Publication Date
- 2025-02-14
AI Technical Summary
Traditional RGB three-color and multi-spectral color temperature sensors have shortcomings in color temperature calculation accuracy and channel increase cost, and single-point color temperature values are difficult to achieve effective color temperature correction in complex light source scenarios.
Using a multi-channel color temperature sensor based on micro-nano structure, the micro-lens array, Bayer filter layer and color temperature filter layer are integrated on the image sensor, and the transmission spectrum of the color temperature filter layer is changed by using the micro-nano structure array to achieve multi-channel color temperature. Measurement.
It realizes high-precision color temperature sensing, reduces cost and process complexity, and can perform multi-point/multi-region color temperature measurement and correction in any imaging scenario, improving the color temperature correction effect.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention belongs to the field of color temperature sensing, and in particular relates to a multi-channel color temperature sensor based on a micro-nano structure. Background Art
[0002] Traditional color temperature sensors based on RGB three colors have poor effects. With the development of spectral technology, multispectral color temperature sensors have emerged to improve the accuracy of color temperature calculation on this basis; however, they are currently based on the principle of dye absorption or multi-layer film interference to achieve light transmission of specific wavelengths. Therefore, increasing the number of channels will increase process complexity and cost. Therefore, most of them are point-type color temperature sensors, and due to the small number of channels, the color temperature correction effect is poor. In addition, due to the complex light sources in many daily camera scenes, the single-point color temperature value has a poor effect on the color temperature correction of photos. Summary of the invention
[0003] The present application provides a multi-channel color temperature sensor based on a micro-nano structure to at least solve the above technical problems existing in the prior art.
[0004] An embodiment of the present application provides a multi-channel color temperature sensor based on a micro-nano structure, comprising a microlens array, a Bayer filter layer, a color temperature filter layer and an image sensor, wherein the Bayer filter layer and the color temperature filter layer are arranged on the image sensor, and the microlens array is arranged on a side of the color temperature filter layer away from the image sensor; the color temperature filter layer is composed of a micro-nano structure array, and the transmission spectrum of the color temperature filter layer is changed by the size and arrangement of the micro-nano structure.
[0005] In one possible implementation manner, the Bayer filter layer is disposed in a central area of the image sensor, and the color temperature filter layer is distributed around the Bayer filter layer.
[0006] In one possible implementation, the substrate of the color temperature filter layer is a single-layer material system or a multi-layer material stacking system.
[0007] In one embodiment, the material of the substrate is SiO 2 or SiN.
[0008] In one embodiment, the micro-nano structure is a nano-pillar or a nano-hole.
[0009] In one embodiment, the shape of the micro-nanostructure is one or more of a circle, a rectangle, a triangle, a hexagon, a cross and an ellipse.
[0010] In one possible implementation, the micro-nano structures are arranged in a tetragonal, oblique tetragonal or hexagonal pattern.
[0011] In one embodiment, the material of the micro-nano structure is one or more of amorphous silicon, polycrystalline silicon, single crystal silicon, silicon nitride, titanium oxide, hafnium oxide, titanium nitride, chalcogenide, aluminum and gold.
[0012] Compared with the prior art, this application has the following advantages: 1. The color temperature filter layer of the present application can realize accurate color temperature sensing by using a micro-nano structure array. It is integrated with an image sensor through semiconductor technology to realize multi-channel color temperature measurement, and has the advantages of low cost and easy processing; 2. The filter structure in the color temperature filter layer of the present application can be arranged in multiple areas on the image sensor, or can be arranged outside the Bayer filter structure, so that multi-point / multi-area color temperature measurement and correction of the captured image can be achieved for any imaging scene. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic diagram of the structure of a multi-channel color temperature sensor in an embodiment of the present application; Figure 2 is a schematic diagram of the arrangement of the color temperature filter layer on the periphery of the Bayer filter layer in an embodiment of the present application; Figure 3 is a schematic diagram of a multi-region arrangement of a color temperature filter layer on an image sensor in an embodiment of the present application; Figure 4 is a flow chart of an embodiment of the present application; 1. Infrared cutoff film; 2. Structural support; 3. Microlens array; 4. Bayer filter layer; 5. Color temperature filter layer; 6. Image sensor. DETAILED DESCRIPTION
[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0015] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0016] refer to Figure 1The present application discloses a multi-channel color temperature sensor based on a micro-nano structure, comprising an infrared cutoff film 1, a structural support member 2, a microlens array 3, a Bayer filter layer 4, a color temperature filter layer 5 and an image sensor 6. The Bayer filter layer 4 and the color temperature filter layer 5 are arranged on the image sensor 6, the microlens array 3 is arranged on the Bayer filter layer 4, and the microlens array 3 is arranged on the side of the Bayer filter layer 4 away from the image sensor 6, the infrared cutoff film 1 is arranged on the side of the Bayer filter layer 4 away from the image sensor 6 and there is a gap between the microlens array 3, and the structural support member 2 is used to fix and protect the above structure.
[0017] The color temperature filter layer 5 is composed of a micro-nano structure array, and the transmission spectrum of the color temperature filter layer 5 is changed by the size and arrangement of the micro-nano structure. The substrate of the color temperature filter layer 5 is a single-layer material system or a multi-layer material stacking system. The material of the substrate includes but is not limited to nano-pillars or nano-holes. The shape of the micro-nano structure includes but is not limited to one or more of a circle, a rectangle, a triangle, a hexagon, a cross and an ellipse. The arrangement of the micro-nano structure includes but is not limited to a square, an oblique square or a hexagon. The material of the micro-nano structure includes but is not limited to one or more of amorphous silicon, polycrystalline silicon, single crystal silicon, silicon nitride, titanium oxide, hafnium oxide, titanium nitride, chalcogenide, aluminum and gold.
[0018] The microlens array 2 and the Bayer filter layer 3 are processed on the image sensor 6 through semiconductor technology, and the infrared cutoff film 1 is obtained by coating technology to obtain an infrared cutoff film, achieving high transmittance in the wavelength range of 450-750nm and low transmittance in other bands, and is fixed on the image sensor 6 through the structural support 2.
[0019] The color temperature filter layer 5 is integrated with the image sensor 6 through semiconductor technology. The filter structure in the color temperature filter layer 5 can be designed according to actual needs, and can be arranged in multiple areas on the image sensor 6 or arranged outside the filter structure of the Bayer filter layer 4.
[0020] The arrangement of the color temperature filter layer 5 on the periphery of the Bayer filter layer 4 is as follows: Figure 2 As shown, the Bayer filter layer 4 is disposed in the central area of the image sensor 6, and the color temperature filter layer 5 is distributed around the Bayer filter layer 4. The transmission spectra of different areas on the color temperature filter layer 5 are inconsistent.
[0021] One of the situations where the filter structures in the color temperature filter layer 5 are arranged in multiple regions on the image sensor 6 is as follows: Figure 3 As shown, a portion of the filter structure of the color temperature filter layer 5 is arranged in the central area of the image sensor 6 , the Bayer filter layer 5 surrounds the color temperature filter layer 5 in the central area, and another portion of the filter structure of the color temperature filter layer 5 is arranged around the Bayer filter layer 5 .
[0022] The filter structure in the color temperature filter layer 5 may also be arranged only in the central area of the image sensor 6 .
[0023] refer to Figure 4 , the detection process of any of the above multi-channel color temperature sensors is as follows: the visible light part of the incident light passes through the infrared cutoff film 1, then passes through the microlens array 3, the Bayer filter layer 4 and the color temperature filter layer 5, and is incident on the image sensor 6. The pixels at different positions of the image sensor 6 corresponding to the color temperature filter layer 5 will obtain the transmission intensity of different wavelengths, and the spectral distribution of the visible light of the incident light can be restored by the algorithm, and then the color temperature calculation formula can be used to calculate the color temperature value of the corresponding area, which is finally used for the color temperature correction of the image. The pixels at different positions of the image sensor 6 corresponding to the Bayer filter layer 4 will obtain the captured image after processing.
[0024] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A multi-channel color temperature sensor based on micro-nano structure, characterized in that: It comprises a microlens array, a Bayer filter layer, a color temperature filter layer and an image sensor, wherein the Bayer filter layer and the color temperature filter layer are arranged on the image sensor, and the microlens array is arranged on a side of the Bayer filter layer away from the image sensor; The color temperature filter layer is composed of a micro-nano structure array, and the transmission spectrum of the color temperature filter layer is changed by the size and arrangement of the micro-nano structure.
2. The multi-channel color temperature sensor based on micro-nano structure according to claim 1, characterized in that: The Bayer filter layer is arranged in the central area of the image sensor, and the color temperature filter layer is distributed around the Bayer filter layer.
3. The multi-channel color temperature sensor based on micro-nano structure according to claim 1, characterized in that: The base of the color temperature filter layer is a single-layer material system or a multi-layer material stacking system.
4. The multi-channel color temperature sensor based on micro-nano structure according to claim 3, characterized in that: The material of the substrate is SiO2 or SiN.
5. The multi-channel color temperature sensor based on micro-nano structure according to claim 1, characterized in that: The micro-nano structure is a nano-column or a nano-hole.
6. The multi-channel color temperature sensor based on micro-nano structure according to claim 1, characterized in that: The shape of the micro-nano structure is one or more of a circle, a rectangle, a triangle, a hexagon, a cross and an ellipse.
7. The multi-channel color temperature sensor based on micro-nano structure according to claim 1, characterized in that: The arrangement of the micro-nano structures is tetragonal, oblique tetragonal or hexagonal.
8. The multi-channel color temperature sensor based on micro-nano structure according to claim 1, characterized in that: The material of the micro-nano structure is one or more of amorphous silicon, polycrystalline silicon, single crystal silicon, silicon nitride, titanium oxide, hafnium oxide, titanium nitride, chalcogenide, aluminum and gold.