Image sensor micro lens structure for improving sensitivity of red pixels and blue pixels

An image sensor and blue pixel technology, applied in the field of image sensors, can solve problems such as difficult image color correction operation, complicated signal white balance processing, and different photosensitivity, so as to achieve approximate photosensitivity, reduce processing complexity, and improve sensitivity Effect

Inactive Publication Date: 2014-07-16
BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

[0008] In a white light environment, the photosensitivity of G pixels is significantly higher than that of R and B pixels, so that in the later image signal processing, the signal gain of R and B pixels needs to be adjusted to 1.2 to 1.3 times in order to restore the image to the same The environment is consistent with the real color white; because the photosensitivity of RGB pixels is not the same, it makes the post-signal white balance processing complicated and brings difficulties to the image color correction operation

Method used

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  • Image sensor micro lens structure for improving sensitivity of red pixels and blue pixels
  • Image sensor micro lens structure for improving sensitivity of red pixels and blue pixels
  • Image sensor micro lens structure for improving sensitivity of red pixels and blue pixels

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specific Embodiment approach

[0021] The image sensor microlens structure that improves red and blue pixel sensitivity of the present invention, its preferred embodiment is:

[0022] The pixel array of the image sensor adopts the red, green and blue arrangement of the Bayer pattern, and the microlens plane area of ​​the red pixel and the blue pixel is larger than the microlens plane area of ​​the green pixel.

[0023] The plane area of ​​the microlens of the red pixel and the blue pixel is 1.2 to 1.3 times the plane area of ​​the microlens of the green pixel.

[0024] The microlens plane areas of the red pixels and the blue pixels are equal or unequal.

[0025] The plane shapes of the microlenses of the red pixels, blue pixels and green pixels are polygons.

[0026] The plane shapes of the microlenses of the red pixels, blue pixels and green pixels are square or rectangular.

[0027] The image sensor micro-lens structure improving the sensitivity of red and blue pixels is used in a CMOS type image sensor...

specific Embodiment

[0029] In the embodiment, the pixel size of the RGB three colors is a square structure as an example, and the area of ​​the R pixel and the B pixel are equal as an example.

[0030] Figure 4a , 4b as shown, Figure 4a Schematic diagram of the plane size of the ML (microlens) unit used for the G pixel, the size of which is PgXPg; Figure 4b Schematic diagram of the ML unit plane size used for R and B pixels, the size of which is PrbXPrg, where the ML plane area of ​​R and B pixels is 1.2 to 1.3 times the ML plane area of ​​G pixel. Figure 4a , 4b The ML plane area used by the R and B pixels shown is larger than the ML plane area used by the G pixel, and the ML with a larger plane area can gather more light, so that the photosensitive device of the pixel can generate more photoelectric charges, that is The photosensitivity of the pixel is improved.

[0031] Figure 5 As shown, it is a schematic diagram of the ML array used in the image sensor pixel array of the present i...

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Abstract

The invention discloses an image sensor micro lens structure for improving the sensitivity of red pixels and blue pixels. The red pixels, green pixels and the blue pixels are arranged in a Bayer mode to form a pixel array of an image sensor, wherein the micro lens plane area of the red pixels and the micro lens plane area of the blue pixels are larger than the micro lens plane area of the green pixels, and the micro lens plane area of the red pixels is equal to or unequal to the micro lens plane area of the blue pixels. The micro lens plane dimension of the red pixels and the micro lens plane dimension of the blue pixels are increased, as a result, the red pixels and the blue pixels can receive a larger amount of light, the sensitivity of the red pixels and the sensitivity of the blue pixels are effectively improved compared with the green pixels, the luminous sensitivity of the red pixels, the luminous sensitivity of the green pixels and the luminous sensitivity of the blue pixels are approximately the same, and the processing complexity of white balance operation on a digital backend image signal is effectively reduced.

Description

technical field [0001] The invention relates to an image sensor, in particular to an image sensor microlens structure for improving the sensitivity of red and blue pixels. Background technique [0002] Image sensors have been widely used in digital cameras, mobile phones, medical devices, automobiles and other applications. In particular, the rapid development of technologies for manufacturing CMOS (Complementary Metal Oxide Semiconductor) image sensors and CCD (Charge Coupled Device) image sensors has made people have higher requirements for the output image quality of image sensors. [0003] Image sensors in the prior art are generally arranged in a Bayer pattern red, green, and blue color filter array structure, and the corresponding pixels are called red, green, and blue pixels, and the red, green, and blue pixels are arranged into a two-dimensional pixel array. [0004] Such as figure 1 As shown, the microlens plane area and pixel area used by each color pixel in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/146
Inventor 郭同辉唐冕旷章曲
Owner BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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