Fingerprint identification apparatus

• US 10,181,069 B2
• Filed: 05/24/2018
• Issued: 01/15/2019
• Est. Priority Date: 12/11/2015
• Status: Active Grant

• Current Assignee: Gingy Technology Inc.
• Original Assignee: Gingy Technology Inc.
• Inventors: Chung, Chuck, Wu, Jen-Chieh
• Primary Examiner(s): Pervan, Michael
• Application Number:
  US15/989,123
• Publication Number:
  US 20180268190A1
• Time in Patent Office: 236 Days
• CPC Class Codes: G02B 27/30 Collimators
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G06V 40/1365 Matching; Classification

Abstract

A fingerprint identification apparatus including a light-transmitting device, an image-capture device disposed opposite to the light-transmitting device, and a collimator disposed between the light-transmitting device and the image-capture device is provided. The collimator includes a plurality of light-shielding layers and a plurality of light-transmitting layers that are alternately stacked. Each of the light-shielding layers has a plurality of openings respectively corresponding to a plurality of pixel regions of the image-capture device. Openings of the plurality of light-shielding layers corresponding to one pixel region are arranged along an oblique direction. The oblique direction and a normal direction of a pressing surface of the light-transmitting device have an included angle θ, and 0°<θ<90°.

Claims

1. A fingerprint identification apparatus, comprising:

a light-transmitting device having a pressing surface;

an image-capture device disposed opposite to the light-transmitting device and having a plurality of pixel regions; and

a collimator disposed between the light-transmitting device and the image-capture device, wherein the collimator comprises;

a plurality of light-shielding layers; and

a plurality of light-transmitting layers alternately stacked with the light-shielding layers, wherein each of the light-shielding layers has a plurality of openings respectively corresponding to the pixel regions, openings of the light-shielding layers corresponding to one pixel region are arranged along an oblique direction, the oblique direction and a normal direction of the pressing surface have an included angle θ

, and 0°

<

θ

<

90°

.

2. The fingerprint identification apparatus of claim 1, wherein 35°

<

θ

<

85°

.

3. The fingerprint identification apparatus of claim 1, wherein the plurality of openings of a light-shielding layer are arranged at a spacing P, at least one opening of the light-shielding layer has a diameter D, the light-shielding layer is disposed on a light-transmitting layer, the light-transmitting layer has a thickness H, and the diameter D, the spacing P, and the thickness H satisfy:

4. The fingerprint identification apparatus of claim 3, wherein the light-shielding layer is one light-shielding layer of the light-shielding layers of the collimator closest to the pressing surface, and the light-transmitting layer is one light-transmitting layer of the light-transmitting layers of the collimator closest to the pressing surface.

5. The fingerprint identification apparatus of claim 3, wherein the light-shielding layer is one light-shielding layer of the light-shielding layers of the collimator closest to the image-capture device, and the light-transmitting layer is one light-transmitting layer of the light-transmitting layers of the collimator closest to the image-capture device.

6. The fingerprint identification apparatus of claim 1, wherein diameters of the openings corresponding to the one pixel region are gradually increased away from the image-capture device.

7. The fingerprint identification apparatus of claim 1, wherein diameters of the openings corresponding to the one pixel region are gradually decreased away from the image-capture device.

8. The fingerprint identification apparatus of claim 1, wherein diameters of the openings corresponding to the one pixel region are substantially identical.

9. The fingerprint identification apparatus of claim 1, wherein the plurality of openings of the different light-shielding layers are arranged at equal spacing.

10. The fingerprint identification apparatus of claim 1, wherein thicknesses of at least two light-transmitting layers of the light-transmitting layers are different.

11. The fingerprint identification apparatus of claim 1, wherein the plurality of openings of one light-shielding layer of the light-shielding layers of the collimator closest to the image-capture device are respectively aligned with the pixel regions of the image-capture device, and the plurality of openings of the other light-shielding layers of the collimator are not aligned with the pixel regions of the image-capture device.