Image module and biometric device using the same

An image module, comprising:

• a photosensitive array comprising a plurality of photosensitive elements;
• and
• a light-screening structure disposed on the photosensitive array, wherein the light-screening structure comprises:
• a light-transmitting layer;
• a plurality of light-shielding layers disposed in the light-transmitting layer and each having a plurality of light passage portions;
• and
• a condensing array disposed on the light-transmitting layer and having a plurality of condensing structures;
• wherein the light passage portions correspond to the photosensitive elements, light passing through the condensing array produces a plurality of concentrated beams, and an aperture of each of the light passage portions is adjusted according to a width of a corresponding concentrated beam at each of the light-shielding layers;
• wherein a focal length of each of the condensing structures is f, an outside diameter of each of the condensing structures is D, a maximum thickness of each of the condensing structures is LH, a minimum width of each of the photosensitive elements is WS, and a distance HS between a focal point of each of the concentrated beam and a top surface of a corresponding photosensitive element satisfies the following formula:
• -
• WS
• ×
• (
• f
• -
• L
• ⁢
• H
• )
• D
• ≤
• H
• ⁢
• S
• ≤
• WS
• ×
• (
• f
• -
• L
• ⁢
• H
• )
• D
• .

A biometric device, comprising:

• a substrate;
• a light source disposed on the substrate for emitting light to an organism;
• and
• an image module for receiving light from the light source, wherein the image module comprises:
• a photosensitive element;
• and
• a light-screening structure disposed on the photosensitive element, wherein the light-screening structure comprises:
• a light-transmitting layer;
• a first light-shielding layer disposed in the light-transmitting layer and having a first light passage portion;
• a second light-shielding layer disposed in the light-transmitting layer and between the first light-shielding layer and the photosensitive element and having a second light passage portion;
• and
• a condensing structure disposed on the light-transmitting layer;
• wherein the first light passage portion and the second light passage portion correspond to the photosensitive element, light passing through the condensing structure produces a concentrated beam, and an aperture of the first light passage portion and an aperture of the second light passage portion are respectively adjusted according to a width of the concentrated beam at the first light-shielding layer and a width of the concentrated beam at the second light-shielding layer
• wherein a minimum width of the photosensitive element is WS, a focal length of the condensing structure is f, an outside diameter of the condensing structure is D, a maximum thickness of the condensing structure is LH, and a distance HS between a focal point of the concentrated beam and a top surface of the photosensitive element satisfies the following formula:
• -
• WS
• ×
• (
• f
• -
• LH
• )
• D
• ≤
• HS
• ≤
• WS
• ×
• (
• f
• -
• LH
• )
• D
• .