Image sensor with improved micro-lens, related imaging method and electronic device

An image sensor, comprising:

• an array of photosensitive units;
• an array of filter units, arranged on the array of photosensitive units;
• and
• an array of micro lenses, arranged on the array of filter units;
• wherein, the array of photosensitive units comprises focusing photosensitive units and non-focusing photosensitive units;
• the array of micro lenses comprises first micro lenses and second micro lenses, one first micro lens covers one focusing photosensitive unit, N×N second micro lenses cover one non-focusing photosensitive unit, where N is a positive integer greater than or equal to 2;
• and the array of micro lenses further comprises third micro lenses, one first micro lens covers N×N third micro lenses, and the N×N third micro lenses covers one focusing photosensitive unit.

An electronic device, comprising:

• an image sensor, comprising:
• an array of photosensitive units;
• an array of filter units, arranged on the array of photosensitive units;
• and
• an array of micro lenses, arranged on the array of filter units, wherein, the array of photosensitive units comprises focusing photosensitive units and non-focusing photosensitive units;
• a detector, configured to detect a current ambient luminous intensity;
• and
• a controller, configured to:
• control the image sensor to enter the first output mode when the current ambient luminous intensity is smaller than a preset intensity;
• control, under the first output mode, the array of photosensitive units to enter a focusing mode;
• obtain output values of a part of photosensitive pixels in each focusing photosensitive unit as first output values;
• obtain output values of another part of photosensitive pixels in each focusing photosensitive unit as second output values;
• perform focusing control according to the first output values and the second output values;
• control, under the first output mode, the array of photosensitive units to enter an imaging mode;
• and
• control the array of photosensitive units to expose to generate an image under the first output mode.