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CN-122027910-A - Image sensor, camera module and electronic equipment

CN122027910ACN 122027910 ACN122027910 ACN 122027910ACN-122027910-A

Abstract

The application provides an image sensor, a camera module and electronic equipment. The image sensor comprises a circuit layer, a pixel layer, a light filtering array and a micro lens array which are sequentially stacked, wherein the light filtering array comprises a plurality of first light filtering units, each first light filtering unit comprises 2N rows by 2N columns of multi-spectrum units, 2N columns of multi-spectrum units are transversely arranged in the first light filtering units, and 2N rows of multi-spectrum units are longitudinally arranged in the first light filtering units, wherein N is more than or equal to 2, the first light filtering units comprise more than 4 multi-spectrum units, any multi-spectrum unit is taken as a starting point in the light filtering array, and the multi-spectrum units of the same type are arranged in N2N areas selected by a transverse frame and a longitudinal frame, so that the distribution uniformity of the multi-spectrum units of different types in the light filtering array is improved, the imaging reality is improved, and the color reduction effect is improved.

Inventors

  • HU JIA
  • XU YING
  • ZHANG XIANDOU
  • HUANG JIANHUI

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260512
Application Date
20250328
Priority Date
20250228

Claims (19)

  1. 1. An image sensor (1) is characterized by comprising a circuit layer (11), a pixel layer (12), a light filtering array (13) and a micro lens array (14) which are sequentially stacked, wherein visible light can sequentially pass through the micro lens array (14) and the light filtering array (13) to the pixel layer (12) and is converted into an electric signal at the pixel layer (12), and the circuit layer (11) is used for processing the electric signal; The optical filtering array (13) comprises a plurality of first optical filtering units (131) arranged in an array, each first optical filtering unit (131) comprises 2N rows by 2N columns of multispectral units (1311) arranged in an array, wherein N is more than or equal to 2, the first optical filtering units (131) comprise more than 4 kinds of multispectral units (1311), and different kinds of multispectral units (1311) are used for filtering light with different colors; In the filter array (13), starting from any one of the multispectral units (1311), 2N rows by N columns of the multispectral units (1311) are used as a first region (132), N rows by 2N columns of the multispectral units (1311) are used as a second region (133), and the types of the multispectral units (1311) in the first region (132) are the same as the types of the multispectral units (1311) in the second region (133); The image sensor (1) is provided with a plurality of multispectral channels (15), a plurality of multispectral channels (15) are in one-to-one correspondence with a plurality of multispectral units (1311), the multispectral channels (15) comprise an ith multispectral channel (151), a jth multispectral channel (152) and an mth multispectral channel (153), the ith multispectral channel (151) and the jth multispectral channel (152) are arranged in the same row, the ith multispectral channel (151) and the mth multispectral channel (153) are arranged in the same column, an interval (N-1) between the ith multispectral channel (151) and the jth multispectral channel (152) is the multispectral channels (15), and an interval (N-1) between the ith multispectral channel (151) and the mth multispectral channel (153) is the multispectral channels (15), wherein i, j and m are all less than or equal to N x 2N; any two of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153) satisfy the following conditions: |λ1-λ2|≤30nm; Wherein λ1 is a wavelength corresponding to a peak of a response curve of one of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153), and λ2 is a wavelength corresponding to a peak of a response curve of the other of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153).
  2. 2. The image sensor (1) according to claim 1, wherein any two of the i-th multispectral channel (151), the j-th multispectral channel (152) and the m-th multispectral channel (153) satisfy: |A1/A2-1|≤30%; Wherein A1 is the sensitivity of one of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153), and A2 is the sensitivity of the other of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153).
  3. 3. The image sensor (1) according to claim 2, wherein any two of the i-th multispectral channel (151), the j-th multispectral channel (152) and the m-th multispectral channel (153) satisfy: Wherein QE1 (n) represents a response curve of one of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153), n1 and n2 are two abscissas corresponding to k x QE1 (λ1) in the ordinate of QE1 (n), QE2 (n) represents a response curve of one of the ith multispectral channel (151), the jth multispectral channel (152) and the mth multispectral channel (153), n3 and n4 are two abscissas corresponding to k x QE2 (λ2) in the ordinate of QE2 (n), and 0< k <20%.
  4. 4. An image sensor (1) as claimed in any one of claims 1 to 3, characterized in that the image sensor (1) is adapted to output an image from the electrical signals of the i-th multi-spectral channel (151), the j-th multi-spectral channel (152) and the m-th multi-spectral channel (153).
  5. 5. The image sensor (1) according to any one of claims 1 to 4, wherein the first filter unit (131) comprises two first filter regions (1312) and two second filter regions (1313), N rows by N columns of the multispectral units (1311) are arranged in each of the first filter regions (1312) and the second filter regions (1313), two of the first filter regions (1312) are arranged along one diagonal of the first filter unit (131), and two of the second multispectral units (T2) are arranged along the other diagonal of the first filter unit (131); the type and ordering of the multispectral units (1311) in one of the first filter regions (1312) is the same as the type and ordering of the multispectral units (1311) in the other of the first filter regions (1312); the type and order of the multispectral units (1311) in one of the second filter regions (1313) is the same as the type and order of the multispectral units (1311) in the other of the second filter regions (1313).
  6. 6. The image sensor (1) according to claim 5, wherein the image sensor (1) is configured to read electrical signals of a plurality of the multispectral channels (15) corresponding to a plurality of the first filtering regions (1312), average the electrical signals of the plurality of the multispectral channels (15) corresponding to each of the first filtering regions (1312), and output an average value; and the device is also used for reading the electric signals of the multiple multispectral channels (15) corresponding to the multiple second light filtering regions (1313), averaging the electric signals of the multiple multispectral channels (15) corresponding to each second light filtering region (1313) to obtain an average value, and outputting the average value.
  7. 7. The image sensor (1) according to any one of claims 1 to 6, wherein the first filter unit (131) comprises D categories of the multispectral units (1311), wherein D = 2n x 2n/M, M is ≡2, M being the number of repetitions of each category of the multispectral units (1311) in each of the first filter units (131).
  8. 8. The image sensor (1) according to any one of claims 1 to 7, wherein a plurality of the multispectral channels (15) comprises a plurality of statistical channels (154), the statistical channels (154) being used for luminance statistics, and in each of the first filter units (131), a plurality of the statistical channels (154) are arranged adjacently, and the sensitivity of a plurality of the statistical channels (154) in the plurality of multispectral channels (15) is larger than the sensitivity of the other multispectral channels (15).
  9. 9. The image sensor (1) according to any one of claims 1 to 8, wherein the first filter unit (131) comprises 4 rows by 4 columns of the multispectral units (1311), and in each of the first filter units (131), the multispectral units (1311) are 8 in kind, and the multispectral units (1311) of each kind are repeatedly arranged 2 times.
  10. 10. The image sensor (1) according to claim 9, wherein the first filtering unit (131) comprises a first multispectral unit (T1), a second multispectral unit (T2), a third multispectral unit (T3), a fourth multispectral unit (T4), a fifth multispectral unit (T5), a sixth multispectral unit (T6), a seventh multispectral unit (T7), and an eighth multispectral unit (T8) of different types; the first multispectral unit (T1) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is between 515nm and 550nm, and the light transmittance T12 of the wavelength range of 525nm to 560nm is more than or equal to 80 percent; the second multispectral unit (T2) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is 440nm to 460nm, and the light transmittance T21 of the wavelength range of 400nm to 480nm is more than or equal to 60 percent; the third multispectral unit (T3) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is between 525nm and 560nm, and the light transmittance T32 of the wavelength range of 500nm to 575nm is more than or equal to 80 percent; The fourth multispectral unit (T4) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is between 440nm and 510nm, and the light transmittance T41 of the light with the wavelength range of 415nm to 420nm is more than or equal to 80 percent; the fifth multispectral unit (T5) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is more than or equal to 510nm, and the light transmittance T52 of the light with the wavelength range of 510nm to 540nm is more than or equal to 90 percent; the sixth multispectral unit (T6) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is more than or equal to 620nm, and the light transmittance T63 which is more than or equal to 90% for the light with the wavelength range of 620nm to 1000 nm; The seventh multispectral unit (T7) meets the conditions that the wavelength corresponding to the peak value of the light transmittance is more than or equal to 600nm, and the light transmittance T72 of the light with the wavelength range of 600nm to 1000nm is more than or equal to 90 percent; The eighth multispectral unit (T8) meets the requirement that the wavelength corresponding to the peak value of the light transmittance is between 440nm and 465nm, and the light transmittance T81 of the wavelength range of 445nm to 465nm is more than or equal to 80 percent.
  11. 11. The image sensor (1) according to claim 10, characterized in that the first multispectral unit (T1) satisfies that the light transmittance T11 for the wavelength range of 400nm to 456nm is 10% or less, the light transmittance T13 for the wavelength range of 630nm to 665nm is 10% or less, and the light transmittance T14 for the wavelength range of 850nm to 1000nm is 90% or more; The second multispectral unit (T2) meets the requirements that the light transmittance T22 is less than or equal to 40 percent for the light with the wavelength range of 495nm to 510nm, the light transmittance T23 is less than or equal to 10 percent for the light with the wavelength range of 525nm to 700nm, and the light transmittance T14 is more than or equal to 90 percent for the light with the wavelength range of 830nm to 1000 nm; The third multispectral unit (T3) meets the requirements that the light transmittance T31 is less than or equal to 10 percent for the light with the wavelength range of 400nm to 465nm, the light transmittance T33 is less than or equal to 10 percent for the light with the wavelength range of 650nm to 750nm, and the light transmittance T34 is more than or equal to 95 percent for the light with the wavelength range of 850nm to 1000 nm; the fourth multispectral unit (T4) meets the requirements that the light transmittance T42 is less than or equal to 15 percent for the light with the wavelength range of 590nm to 715nm and the light transmittance T43 is more than or equal to 90 percent for the light with the wavelength range of 780nm to 1000 nm; The fifth multispectral unit (T5) meets the requirements that the light transmittance T51 is less than or equal to 10 percent for the wavelength range from 400nm to 470nm and the light transmittance T53 is more than or equal to 95 percent for the wavelength range from 540nm to 1000 nm; The sixth multispectral unit (T6) meets the requirements that the light transmittance T61 is more than or equal to 60 percent for the light with the wavelength range of 400nm to 460nm and the light transmittance T62 is less than or equal to 10 percent for the light with the wavelength range of 530nm to 570 nm; The seventh multispectral unit (T7) meets the condition that the light transmittance T71 is less than or equal to 10 percent for the wavelength range from 400nm to 570 nm; the eighth multispectral unit (T8) meets the requirements that the light transmittance T82 of the wavelength range of 400nm to 485nm is more than or equal to 60 percent, the light transmittance T83 of the wavelength range of 540nm to 775nm is less than or equal to 10 percent, and the light transmittance T84 of the wavelength range of 830nm to 1000nm is more than or equal to 90 percent.
  12. 12. The image sensor (1) according to any one of claims 1 to 11, wherein the filter array (13) further comprises a plurality of second filter units (134) arranged in an array, the plurality of second filter units (134) being arranged around at least part of the plurality of first filter units (131).
  13. 13. The image sensor (1) according to claim 12, characterized in that O second filter units (134) are spaced between two adjacent first filter units (131), wherein O is ≡0.
  14. 14. The image sensor (1) according to claim 12, wherein P rows by P columns of said first filter units (131) are adjacently arranged to form a first multispectral collection (135), and S second filter units (134) are spaced between two adjacent first multispectral collections (135), wherein S is equal to or greater than 0.
  15. 15. The image sensor (1) of claim 12, characterized in that T second filter units (134) are spaced between two adjacent multispectral units (1311), wherein T is ≡0.
  16. 16. The image sensor (1) of any of claims 12 to 15, wherein the area of a single multispectral unit (1311) is U times the area of a single second filter unit (134), wherein U = c 2 , c is ≡1.
  17. 17. A camera module (10), characterized by, including camera lens (7), support (6), circuit subassembly and image sensor (1) according to any one of claims 1 to 16, image sensor (1) with support (6) all install in circuit subassembly, camera lens (7) install in support (6), camera lens (7) with image sensor (1) are just to setting.
  18. 18. The camera module (10) of claim 17, wherein the camera module (10) further comprises a filter (5), the filter (5) being arranged between the image sensor (1) and the lens (7).
  19. 19. An electronic device (100) comprising an image processor and a camera module (10) according to claim 17 or 18, the image processor (50) being in communication with the camera module (10), the image processor (50) being arranged to obtain image data from the camera module (10) and to process the image data.

Description

Image sensor, camera module and electronic equipment Technical Field The application relates to the technical field of shooting equipment, in particular to an image sensor, a shooting module and electronic equipment. Background A common three-channel camera mimics the cone cells of the human eye, with three response curves for color reproduction. However, the spectrum response curve is different from human eyes, and certain colors are difficult to restore, and certain color differences cannot be restored, so that a multispectral camera is introduced. The multispectral camera can utilize the filter array to realize the filtration of various visible lights so as to realize better color reproduction. However, the ordering of the different filter materials in the filter array is detrimental to image processing, resulting in poor color rendition of the multispectral camera. Disclosure of Invention The application provides an image sensor, a camera module and electronic equipment. The image sensor comprises a circuit layer, a pixel layer, a light filtering array and a micro lens array which are sequentially stacked, wherein the light filtering array comprises a plurality of first light filtering units, each first light filtering unit comprises 2N rows by 2N columns of multi-spectrum units, 2N columns of multi-spectrum units are transversely arranged in the first light filtering units, and 2N rows of multi-spectrum units are longitudinally arranged in the first light filtering units, wherein N is more than or equal to 2, the first light filtering units comprise more than 4 multi-spectrum units, any multi-spectrum unit is taken as a starting point in the light filtering array, and the multi-spectrum units of the same type are arranged in N2N areas selected by a transverse frame and a longitudinal frame, so that the distribution uniformity of the multi-spectrum units of different types in the light filtering array is improved, the imaging reality is improved, and the color reduction effect is improved. In a first aspect, the present application provides an image sensor. The image sensor comprises a circuit layer, a pixel layer, a filtering array and a micro lens which are sequentially stacked, wherein visible light can sequentially pass through the micro lens and the filtering array to the pixel layer and is converted into an electric signal at the pixel layer, and the circuit layer is used for processing the electric signal; the optical filtering array comprises a plurality of first optical filtering units which are arranged in an array manner, each first optical filtering unit comprises 2N rows and 2N columns of multispectral units which are arranged in an array manner, wherein N is more than or equal to 2, each first optical filtering unit comprises more than 4 kinds of multispectral units, and different kinds of multispectral units are used for filtering light with different colors; in the filter array, taking any multispectral unit as a starting point, taking 2N rows of N columns of multispectral units as a first area, N rows of 2N columns of multispectral units as a second area, wherein the types of the multispectral units in the first area are the same as those of the multispectral units in the second area, the image sensor is provided with a plurality of multispectral channels, the multispectral channels are in one-to-one correspondence with the multispectral units, the multispectral channels comprise an ith multispectral channel, a jth multispectral channel and an mth multispectral channel, the ith multispectral channel and the jth multispectral channel are arranged in the same row, the ith multispectral channel and the mth multispectral channel are arranged in the same column, the interval N-1 multispectral channels are arranged between the ith multispectral channel and the mth multispectral channel, wherein the intervals N-1 multispectral channels are smaller than or equal to N x 2N, and the i, j and m are all smaller than or equal to N, and the two of the multispectral channels in the ith multispectral channel, the jth multispectral channel and the mth multispectral channel and any m are satisfied: |λ1-λ2|≤30nm; Wherein λ1 is the wavelength corresponding to the peak value of the response curve of one of the ith, jth and mth multispectral channels, and λ2 is the wavelength corresponding to the peak value of the response curve of the other of the ith, jth and mth multispectral channels. According to the application, the types of the multispectral units in the first area and the multispectral units in the second area are designed to be the same, so that at least part of multispectral units are repeatedly arranged, the problem that enough types of filter materials are difficult to select can be solved, uniform distribution of different types of multispectral units can be ensured, imaging authenticity is facilitated, and better color reduction is facilitated. In the application, the response curve distributio