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Optical fingerprint sensors

A sensor and fingerprint technology, applied in the direction of acquiring/arranging fingerprints/palmprints, instruments, electric solid devices, etc., can solve problems such as insufficient collection, avoid image inhomogeneity, improve image uniformity, and improve The effect of sensitivity

Pending Publication Date: 2021-04-27
VISERA TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting field of view (FOV) is still insufficient to collect enough light

Method used

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Embodiment Construction

[0069] Referring to FIGS. 1 and 2 , according to an embodiment of the present invention, an optical fingerprint sensor 10 is provided. figure 1 is a schematic cross-sectional view of the optical fingerprint sensor 10 . figure 2 It is a top view of the arrangement and size of the microlens group of the optical fingerprint sensor 10 .

[0070] exist figure 1 Among them, the optical fingerprint sensor 10 includes a substrate 12, a first photoelectric conversion unit 14, a second photoelectric conversion unit 16, a first light-shielding layer 18, a plurality of first openings 20, a transparent layer 22, a second light-shielding layer 24, The first group 26 of second openings, the second group 28 of second openings, the first microlens group 30 and the second microlens group 32 . The first photoelectric conversion unit 14 and the second photoelectric conversion unit 16 are disposed in the substrate 12 . The first light shielding layer 18 is disposed on the substrate 12 . The f...

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Abstract

An optical fingerprint sensor is provided. The optical fingerprint sensor includes a substrate, a first light shield layer, and a second light shield layer. The substrate has a plurality of photoelectric conversion units. The first light shield layer is disposed on the substrate. The first light shield layer includes a plurality of first apertures. The second light shield layer is arranged on the first light shield layer. The second light shield layer is provided with a plurality of second aperture groups. Each first aperture corresponds to one second aperture group.

Description

technical field [0001] The invention relates to an optical fingerprint sensor, in particular to an optical fingerprint sensor capable of improving sensitivity and visual field. Background technique [0002] In traditional optical fingerprint sensors, oblique light (such as incident light at a large angle) is blocked by the light-shielding layer and cannot reach the photodiode, so that the sensor cannot collect enough light, resulting in low sensitivity and poor image contrast. [0003] In order to improve the sensitivity, the microlens array is arranged above the opening in the light-shielding layer (that is, one microlens corresponds to one photodiode) to collect more light from different angles. However, the formed field of view (FOV) is still insufficient to collect enough light. [0004] Therefore, it is highly desirable to develop an optical fingerprint sensor with a wide field of view (FOV). Contents of the invention [0005] An object of the present invention is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/1324G06V40/1318H01L27/14678H01L27/14627H01L27/14623G06V40/1365
Inventor 王唯科邱怡华
Owner VISERA TECH CO LTD