Image sensor

Abstract

The invention discloses an image sensor. Compared with an existing image sensor, due to the fact that an existing visible light sensing unit in a Bayer format is reserved in a center area of a light sensing unit array and an infrared light sensing unit is added in the marginal area, the intensity of infrared light and the intensity of the visible light can be obtained through only one two-way light filter, and the cost of the light filter and a switching mechanism is reduced. In the daytime, the intensity of the visible light and the intensity of the infrared light can be worked out by means of the light sensing unit in the center area and the light sensing unit in the marginal area, so that the color accuracy of a daytime image is ensured; at night, the light sensing unit in the center area can receive the energy of the visible light and the energy of the infrared light at the same time, and the night image brightness is increased. In addition, due to the fact that the infrared light sensing unit is arranged on the marginal area of the light sensing unit array, compared with the existing image sensor, the positions of redundant light sensing units on the periphery of the image sensor are just utilized, and the area of the image sensor will not be increased.

Description

technical field [0001] The invention relates to the technical field of imaging, in particular to an image sensor. Background technique [0002] At present, image sensors (Sensors) are mainly used to capture images of objects in video cameras, digital cameras and other imaging devices. Image sensors include multiple photosensitive units, and photosensitive units are pixels, which play a decisive role in image quality. To convert the optical signal corresponding to the object into an electrical signal, the image sensor then inputs these signals to the Image Signal Processor (ISP), and the IPS performs linear correction, noise removal, and dead pixels on the signal output by the front-end image sensor. Removal, interpolation, white balance, automatic exposure control and other processing, so as to realize the function of restoring the scene picture. [0003] Currently, in the camera market, 80% of the image sensors are Bayer (Bayer) format image sensors. In the image sensor o...

AI Technical Summary

Problems solved by technology

Compared with the existing Bayer format image sensor, this image sensor only needs to cooperate with a dual-pass filter to realize simultaneous sensing of visible light and infrared light. However, in the photosensitive unit array, since half of the green channel is used to set The infrared photosensitive unit Ir, that is, the designed infrared photosensitive unit Ir sacrifices half of the photosensitive performance of the green photosensitive subunit G of the green channel, so it will bring the following problems: due to the reduction of half of the green photosensitive subunit , so the definition has declined to a certain extent; and due to the change of the Bayer pattern, most of the ISPs on the market currently do not support this image sensor, and the chip must be redesigned, thereby increasing the cost of the product; in addition, due to the difference between the wavelength of infrared light and The wavelength of visible light differs greatly, so the mixing of infrared photosensitive unit and visible light photosensitive unit may cause crosstalk problem of image sensor

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