Biometric sensor assembly with integrated visual indicator

• US 8,471,345 B2
• Filed: 03/05/2010
• Issued: 06/25/2013
• Est. Priority Date: 03/05/2010
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: AuthenTec Incorporated (Apple Inc.)
• Inventors: Bond, Robert Henry, Kramer, Alan, Gozzini, Giovanni
• Primary Examiner(s): LUKE, DANIEL M
• Application Number:
  US12/718,892
• Publication Number:
  US 20110215341A1
• Time in Patent Office: 1,208 Days
• Field of Search: 257/414, 257/E23.129, 382/126
• US Class Current: 257/414
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/1815 Shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

A biometric sensor assembly comprises a substrate to which is mounted a die containing sensor circuitry, at least one conductive bezel having a visual indicator region formed therein, and electrically connected to said die by way of said substrate, a light source, and a light-directing region directing light from the light source to the visual indicator region. The die, the light-directing region, and the bezel are encased in an encapsulation structure such that a portion of a surface of the die and the visual indication region are exposed or at most thinly covered by the encapsulation structure. The light-directing region directs light emitted by the light source within the encapsulation structure to the visual indicator region. Desired indicia in the visual indicator region may thereby be illuminated, while the die and bezel, and optionally the light source, are protected by the encapsulation structure.

Claims

1. A biometric sensing device with integrated visual indicator, comprising:

a substrate having a first side and a second side;

a die having formed therein biometric sensing circuitry, said die secured to a die-receiving region of said first side of said substrate;

a first conductive bezel having a visual indicator region, said first conductive bezel secured to a first bezel region of said first side of said substrate proximate said die-receiving region;

a light source associated with said substrate;

a first light-directing region optically coupled between said light source and said visual indicator region of said first conductive bezel; and

an encapsulation material embedding therein said die, said first light-directing region, and said first conductive bezel such that said encapsulation material is between said die and said first conductive bezel, and such that said visual indicator region of said first conductive bezel and a top surface of said die are visibly exposed to a user.

2. The biometric sensing device of claim 1, wherein said first light-directing region includes a first optical element which preferentially directs light from said light source to said visual indicator region.

3. The biometric sensing device of claim 2, wherein said first optical element is selected from the group consisting of:

optical lenses, fiber optic light guide, light pipes, and molded optically conductive compound.

4. The biometric sensing device of claim 2, wherein said first optical element is molded onto said first conductive bezel.

5. The biometric sensing device of claim 1, wherein said light source is located proximate said first side of said substrate.

6. The biometric sensing device of claim 1, wherein said substrate is provided with an optical via connecting said first and second sides of said substrate, and further wherein said light source is located proximate said second side of said substrate and light emitted therefrom may pass from said second side of said substrate through said optical via to said first side of said substrate and to said first light-directing region.

7. The biometric sensing device of claim 6, wherein said light source is electrically interconnected to said substrate.

8. The biometric sensing device of claim 1, wherein said light source defines a portion of said substrate such that light is emitted therefrom at said first side of said substrate.

9. The biometric sensing device of claim 1, wherein said light source is integrated with said die such that light may be emitted therefrom proximate said first side of said substrate.

10. The biometric sensing device of claim 1, wherein:

said first light directing region is a void defined by sidewalls of said first conductive bezel and said visual indicator region; and

said first conductive bezel is secured to said substrate such that said encapsulation material is prevented from entering said void.

11. The biometric sensing device of claim 10, wherein said light source is located within said void.

12. The biometric sensing device of claim 1, further comprising:

a second conductive bezel secured to a second bezel region of said first side of said substrate, said second conductive bezel having a visual indicator region, and said second conductive bezel being electrically interconnected to said die by way of said substrate; and

a second light-directing region optically coupled between said light source and said visual indicator region of said second conductive bezel;

wherein said encapsulation material further embeds therein said second conductive bezel, such that said visual indicator region of said second conductive bezel is visibly exposed to a user.

13. The biometric sensing device of claim 12, wherein said first conductive bezel and said second conductive bezel form portions of a bezel frame, and further wherein said bezel frame is physically coupled to said substrate and electrically coupled to said die by way of said substrate.

14. The biometric sensing device of claim 12, wherein said light source comprises first and second light emitting elements disposed such that said first light emitting element is optically coupled to said visual indicator region of said first conductive bezel by said first light-directing region, and said second light emitting element is optically coupled to said visual indicator region of said second conductive bezel by said second light-directing region.

15. The biometric sensing device of claim 12, wherein said visual indicator region of said first conductive bezel has a first visual appearance and said visual indicator region of said second conductive bezel has a second visual appearance, said first and said second visual appearances being different.

16. The biometric sensing device of claim 1, wherein said first conductive bezel is a conductive material having a pattern formed therein, the pattern forming said visual indicator region of said first conductive bezel.

17. The biometric sensing device of claim 16, wherein said conductive material is substantially opaque, and said pattern is formed as at least one opening extending entirely through a surface of said first conductive bezel.

18. The biometric sensing device of claim 16, wherein said conductive material is substantially opaque, and said pattern is formed through changes in thickness of a surface of said first conductive bezel.

19. The biometric sensing device of claim 18, wherein said changes in thickness are formed as recesses in the back side of said first conductive bezel opposite said visual indicator region.

20. The biometric sensing device of claim 1, wherein said first conductive bezel is formed of a translucent material.

21. The biometric sensing device of claim 1, wherein said light source is electrically interconnected to said die by way of said substrate.

22. The biometric sensing device of claim 1, wherein said first conductive bezel is electrically interconnected to said die by way of said substrate.

23. A biometric sensing device with integrated visual indicator, comprising:

a substrate having a first side and a second side;

a die secured to said first side of said substrate and including an array of biometric sensing elements;

a first conductive bezel including a visual indicator region and being secured to said first side of said substrate, said first conductive bezel being electrically interconnected to said die via said substrate;

a light source associated with said substrate;

a first light-directing region optically coupled between said light source and said visual indicator region of said first conductive bezel; and

an encapsulation material embedding therein said die, said first light-directing region, and said first conductive bezel such that said encapsulation material is between said die and said first conductive bezel, and such that said visual indicator region of said first conductive bezel and said array of biometric sensing elements are visibly exposed to a user.

24. The biometric sensing device of claim 23, wherein said first light-directing region includes a first optical element configured to direct light from said light source to said visual indicator region.

25. The biometric sensing device of claim 24, wherein said first optical element includes at least one of an optical lens, fiber optic light guide, light pipe and a molded optically conductive compound.

26. The biometric sensing device of claim 24, wherein said first optical element is molded onto said first conductive bezel.

27. The biometric sensing device of claim 23, further comprising:

a second conductive bezel secured to said first side of said substrate and including a visual indicator region, and said second conductive bezel being electrically interconnected to said die via said substrate; and

a second light-directing region optically coupled between said light source and said visual indicator region of said second conductive bezel;

wherein said encapsulation material further embeds therein said second conductive bezel, such that said visual indicator region of said second conductive bezel is also visibly exposed to the user.

28. The biometric sensing device of claim 27, wherein said first conductive bezel and said second conductive bezel define a bezel frame;

and wherein said bezel frame is physically coupled to said substrate and electrically coupled to said die via said substrate.

29. The biometric sensing device of claim 27, wherein said light source comprises first and second light emitting elements positioned such that said first light emitting element is optically coupled to said visual indicator region of said first conductive bezel by said first light-directing region, and said second light emitting element is optically coupled to said visual indicator region of said second conductive bezel by said second light-directing region.

30. A method of making a biometric sensing device with integrated visual indicator, comprising:

securing a die to a first side of a substrate, the die including an array of biometric sensing elements;

securing a first conductive bezel including a visual indicator region to the first side of the substrate, and electrically interconnecting the first conductive bezel to the die via the substrate;

providing a light source associated with the substrate;

optically coupling a first light-directing region between the light source and the visual indicator region of the first conductive bezel; and

embedding the die, the first light-directing region, and the first conductive bezel in an encapsulation material such that said encapsulation material is between said die and said first conductive bezel, and such that the visual indicator region of the first conductive bezel and the array of biometric sensing elements are visibly exposed to a user.

31. The method of claim 30, wherein the first light-directing region includes a first optical element configured to direct light from the light source to the visual indicator region.

32. The method of claim 31, wherein the first optical element includes at least one of an optical lens, fiber optic light guide, light pipe and a molded optically conductive compound.

33. The method of claim 31, wherein said first optical element is molded onto the first conductive bezel.

34. The method of claim 30, further comprising:

securing a second conductive bezel to the first side of the substrate and including a visual indicator region, and electrically interconnecting the second conductive bezel to the die via the substrate; and

optically coupling a second light-directing region between the light source and the visual indicator region of the second conductive bezel;

wherein the encapsulation material further embeds therein the second conductive bezel, such that the visual indicator region of the second conductive bezel is also visibly exposed to the user.

35. The method of claim 34, wherein the first conductive bezel and the second conductive bezel define a bezel frame;

and wherein the bezel frame is physically coupled to the substrate and electrically coupled to the die via the substrate.

36. The method of claim 34, wherein the light source comprises first and second light emitting elements positioned such that the first light emitting element is optically coupled to the visual indicator region of the first conductive bezel by the first light-directing region, and the second light emitting element is optically coupled to the visual indicator region of the second conductive bezel by the second light-directing region.