Method for optically detecting a fingerprint or an object, and device with at least one screen
First Claim
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1. A method for optically capturing a fingerprint or an object on a surface (2) of a cover plate (1) of a screen, comprising the following steps:
- providing a plurality of photosensors (4);
providing a plurality of display pixels (6);
assigning each of said photosensors (4) to a respective display pixel (6), wherein the display pixels (6) emit light radiation and the photosensors (4) capture light radiation from the display pixels (6) reflected by the surface (2) of the cover plate (1) of the screen within a scan angle (8), wherein the scan angle (8) corresponds in a virtual mirror image plane (9) to the size of a selected one of the display pixels (6), and wherein the scan angle (8) does not exceed the following size;
α
≤
2 arctan(d/4h1)wherein;
α
=scan angle 8d=edge length of the display pixel 6h1=distance from the upper side of the display pixel to the surface 2 of the cover plate.
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Abstract
In a method for optically capturing a fingerprint or an object on a surface (2) of a cover plate (1) of a screen with a plurality of photosensors (4) which are each assigned to a respective display pixel (6), the display pixels (6) emit light radiation and the photosensors (4) capture light radiation from the display pixels (6) reflected by the surface (2) within a scan angle (8). The scan angle (8) describes in a virtual mirror image plane (9) the size of the display pixel (6).
14 Citations
26 Claims
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1. A method for optically capturing a fingerprint or an object on a surface (2) of a cover plate (1) of a screen, comprising the following steps:
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providing a plurality of photosensors (4); providing a plurality of display pixels (6); assigning each of said photosensors (4) to a respective display pixel (6), wherein the display pixels (6) emit light radiation and the photosensors (4) capture light radiation from the display pixels (6) reflected by the surface (2) of the cover plate (1) of the screen within a scan angle (8), wherein the scan angle (8) corresponds in a virtual mirror image plane (9) to the size of a selected one of the display pixels (6), and wherein the scan angle (8) does not exceed the following size;
α
≤
2 arctan(d/4h1)wherein; α
=scan angle 8d=edge length of the display pixel 6 h1=distance from the upper side of the display pixel to the surface 2 of the cover plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification