Image sensor, output method, phase focusing method, imaging device, and terminal

A phase focusing method comprising:

• providing an image sensor, and determining an output mode according to a mode selection instruction, the image sensor comprising a photosensitive unit array, a filter cell array, and a micro-lens array, the filter cell array located above the photosensitive unit array, the micro-lens array located above the filter cell array, each micro-lens covering a corresponding filter cell and a corresponding photosensitive unit, each photosensitive unit comprising four photosensitive pixels, wherein the output mode comprises a first output mode and a second output mode, the first output mode is configured to improve an imaging sensitivity and a signal-to-noise ratio, and the second output mode is configured to realize a phase focusing;
• controlling exposure of the photosensitive unit array and reading outputs of the photosensitive unit array;
• controlling pixel information of photosensitive pixels of a same photosensitive unit to be individually output when the output mode is the second output mode;
• and
• distinguishing imaging light to obtain phase difference information for imaging according to the pixel information of the photosensitive pixels of the photosensitive unit, and adjusting the phase focusing according to the phase difference information;
• gathering and storing the outputs of the photosensitive pixels of rows k and k+1 into a register, wherein k=2n−1, n is a natural number, k+1 is less than or equal to the total row of the photosensitive pixels, each photosensitive unit comprises 2*2 photosensitive pixels, the image sensor comprises the register;
• and
• extracting the outputs of the photosensitive pixels of rows k and k+1 from the register, and adding the outputs of the photosensitive pixels of the same photosensitive unit to obtain a pixel value of the photosensitive unit.

An imaging device, comprising:

• an image sensor comprising:
• a photosensitive unit array;
• a filter cell array, located above the photosensitive unit array;
• and
• a micro-lens array, located above the filter cell array, each micro-lens covering a corresponding filter cell and a corresponding photosensitive unit, each photosensitive unit comprising four photosensitive pixels, and
• a control module, configured to determine an output mode according to a mode selection instruction, and control exposure of the photosensitive unit array and read outputs of the photosensitive unit array, wherein the output mode comprises a first output mode and a second output mode, the first output mode is configured to improve an imaging sensitivity and a signal-to-noise ratio, and the second output mode is configured to realize a phase focusing, the control module is further configured to control pixel information of four photosensitive pixels of a same photosensitive unit to be combined to be output when the output mode is the first output mode;
• the control module is further configured to control the pixel information of the four photosensitive pixels of the same photosensitive unit to be individually output when the output mode is the second output mode, distinguish imaging light according to the pixel information of the four photosensitive pixels of the photosensitive unit to obtain phase difference information for imaging, and adjust the phase focusing according to the phase difference information,
• wherein each photosensitive unit comprises 2*2 photosensitive pixels, the image sensor comprises a register, and the control module is configured to:
• gather and store the outputs of the photosensitive pixels of rows k and k+1 into the register, wherein k=2n−1, n is a natural number, k+1 is less than or equal to the total row of the photosensitive pixels;
• and
• extract the outputs of the photosensitive pixels of rows k and k+1 from the register, and add the outputs of the photosensitive pixels of the same photosensitive unit to obtain a pixel value of the photosensitive unit.