Method and device for fingerprint acquisition, and touchpad

A touchpad, comprising a control circuit, a first electrode group, and a second electrode group, wherein

• the first electrode group comprises a first basic electrode group and a first collecting electrode group, and the second electrode group comprises a second basic electrode group and a second collecting electrode group;
• the first basic electrode group comprises multiple first basic sensor electrodes arranged in parallel in a first direction, each of the first basic sensor electrodes is spaced from an adjacent first basic sensor electrode with a first basic gap, and each of the first basic sensor electrodes is electrically connected with the control circuit through at least one of first signal lines;
• the second basic electrode group comprises multiple second basic sensor electrodes arranged in parallel in a second direction, each of the second basic sensor electrodes is spaced from an adjacent second basic sensor electrode with a second basic gap, and the first direction is not parallel to the second direction;
• the first collecting electrode group comprises multiple first collecting sensor electrodes arranged in parallel in the first direction, each of the first collecting sensor electrodes is spaced from an adjacent first collecting sensor electrode with a first acquisition gap, and each of the first collecting sensor electrodes is electrically connected with the control circuit through the at least one of the first signal lines;
• the second collecting electrode group comprises multiple second collecting sensor electrodes arranged in parallel in the second direction, and each of the second collecting sensor electrodes is spaced from an adjacent second collecting sensor electrode with a second acquisition gap;
• the first basic gap is larger than the first acquisition gap, and the second basic gap is larger than the second acquisition gap;
• the first acquisition gap is less than or equal to 50 μm, and the second acquisition gap is less than or equal to 50 μm;
• in a case that the first electrode group and the second electrode group are stacked, an overlapping portion of the first collecting electrode group and the second collecting electrode group forms an acquisition region, and a region of the touchpad except the acquisition region is a basic region;
• and
• the control circuit is configured to apply a touch scanning signal to part or all of the first basic sensor electrodes in the first basic electrode group through the at least one of the first signal lines, apply the touch scanning signal to part of the first collecting sensor electrodes in the first collecting electrode group through the at least one of the first signal lines, and apply a fingerprint acquisition signal to all of the first collecting sensor electrode in the first collecting electrode group through the at least one of first signal lines.