Fingerprint recognition module and light guide member

Abstract

A fingerprint recognition module includes a light guide, a flexible circuit board, two light emitting elements and a fingerprint recognition chip. The light guide includes a bottom and a wall, the wall forms a first space, the light guide forms a first hole in the bottom; the flexible circuit board is disposed in the first space and has a first part, a second part, a third part and a fourth part connected in sequence; the first part passes through the first hole; the third part faces away from the bottom of the light guide; the second part and the fourth part face the bottom of the light guide; the light emitting elements are disposed on the flexible circuit board and face the light guide; the fingerprint recognition chip is disposed on the third part of the flexible circuit board.

Description

Technical Field

[0001] This invention relates to light guide components for fingerprint recognition modules; in particular, it refers to a light guide component that can improve brightness and light emission uniformity. Background Technology

[0002] Fingerprint recognition is a type of biometric identification technology. It mainly aims to identify or confirm identity by recognizing the unique fingerprint information on each user's finger.

[0003] Fingerprint recognition modules are now widely used and installed in electronic devices such as mobile phones, tablets, and laptops. Users can quickly and effectively achieve effects such as fingerprint unlocking or fingerprint encryption by touching the fingerprint recognition module.

[0004] However, when a fingerprint recognition module is installed on an electronic device, the user must touch a specific area on the device to perform fingerprint recognition. Therefore, how to provide a method that clearly indicates the recognition area of ​​the fingerprint recognition module to the user is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a fingerprint recognition module that can clearly indicate the recognition area of ​​the fingerprint recognition module for the user.

[0006] To achieve the above objectives, the present invention provides a fingerprint recognition module comprising a light guide, a flexible circuit board, two light-emitting elements, and a fingerprint recognition chip. The light guide is made of a light-transmitting material and includes a bottom and a protrusion surrounding and connecting the bottom, with the protrusion forming a first space. The light guide has two light guide holes communicating with the first space, and a first through hole communicating with the first space is formed at or near the center of the bottom. The flexible circuit board is disposed in the first space and has at least one electrical signal transmission line. The flexible circuit board has a first portion, a second portion, a third portion, and a fourth portion connected in sequence. The first portion extends out from the first through hole. The third portion faces away from the bottom of the light guide. The second portion and the fourth portion face the bottom of the light guide and are located between the third portion and the bottom. The two light-emitting elements are respectively disposed on the flexible circuit board and electrically connected to the at least one electrical signal transmission line on the flexible circuit board, and are respectively located in the two light guide holes; and the fingerprint recognition chip is disposed on the third part of the flexible circuit board and electrically connected to the at least one electrical signal transmission line on the flexible circuit board.

[0007] The present invention also provides a fingerprint recognition module, comprising a light guide, a flexible circuit board, a plurality of light-emitting elements, and a fingerprint recognition chip. The light guide is made of a light-transmitting material and includes a bottom and a protrusion surrounding and connecting the bottom, the protrusion forming a first space, and the light guide having a first through hole in the bottom. The flexible circuit board is disposed in the first space and has at least one electrical signal transmission line, and has a first part, a second part, a third part, and a fourth part sequentially connected. The first part extends out from the first through hole; the third part faces away from the bottom of the light guide; the second part and the fourth part face the bottom of the light guide and are located between the third part and the bottom. The plurality of light-emitting elements are disposed on the flexible circuit board and electrically connected to the at least one electrical signal transmission line on the flexible circuit board, and face the light guide. The fingerprint recognition chip is disposed on the third part of the flexible circuit board and electrically connected to the at least one electrical signal transmission line on the flexible circuit board.

[0008] The present invention also provides a light guide made of a light-transmitting material, wherein the light guide includes a bottom and a protrusion surrounding and connecting the bottom, characterized in that: the protrusion surrounds and forms a first space, and the bottom has a first through hole located at or near the center of the bottom, and the first through hole connects the first space with the outside of the light guide.

[0009] The advantage of this invention is that, by having the first perforation at the bottom of the light guide, the first part of the flexible circuit board disposed in the light guide can pass through the first perforation. In this way, the first part of the flexible circuit board passing through the first perforation can be prevented from blocking the light-emitting path from the light-emitting element to the protrusion, thereby improving the light-emitting brightness and light-emitting uniformity, and thus achieving the purpose of clearly indicating the recognition area of ​​the user's fingerprint recognition module. Attached Figure Description

[0010] Figure 1 A perspective view of a fingerprint recognition module according to a preferred embodiment of the present invention.

[0011] Figure 2 for Figure 1 Top view.

[0012] Figure 3 for Figure 2 3-3 sectional view.

[0013] Figure 4 This is a perspective view of some components of the fingerprint recognition module in the preferred embodiment described above.

[0014] Figure 5 This is a perspective view of the light guide component of the fingerprint recognition module in the preferred embodiment described above.

[0015] Figure 6 This is a perspective view of the light guide component of a fingerprint recognition module according to another preferred embodiment.

[0016] Figure 7 for Figure 6 Top view.

[0017] Figure 8 This is a top view of the light guide of the fingerprint recognition module in another preferred embodiment.

[0018] Figure 9 This is a perspective view of the light guide component of a fingerprint recognition module according to another preferred embodiment.

[0019] Figure 10 for Figure 9 Top view. Detailed Implementation

[0020] To more clearly illustrate the present invention, several preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figures 1 to 5 The image shows a fingerprint recognition module 1 according to a preferred embodiment of the present invention. The fingerprint recognition module 1 includes a light guide 10, a flexible circuit board 20, a plurality of light-emitting elements 30, and a fingerprint recognition chip 40. The fingerprint recognition chip 40 is, for example, a capacitive sensing element, used to sense the intensity of the charge peaks and troughs of the fingerprint ripples to generate electronic signals, thereby enabling the identification of user information.

[0021] The light guide 10 is made of a light-transmitting material, such as plastic. Figure 5 As shown, the light guide 10 includes a bottom 11 and a protrusion 12 surrounding and connecting the bottom 11, and the protrusion 12 surrounds and forms a first space 121. The light guide 10 has a first through hole 13 formed in the bottom 11, that is, the first through hole 13 can connect the first space 121 and the external space of the light guide 10.

[0022] Please cooperate. Figure 3 The flexible circuit board 20 is disposed in the first space 121 and has at least one electrical signal transmission line. The flexible circuit board 20 has a first part 21, a second part 22, a third part 23 and a fourth part 24 connected in sequence. The first part 21 extends out from the first through hole 13. The third part 23 faces away from the bottom 11 of the light guide 10. The second part 22 and the fourth part 24 face the bottom 11 of the light guide 10 and are located between the third part 23 and the bottom 11.

[0023] Furthermore, the flexible circuit board 20 has a surface S, which is shared by the first portion 21, the second portion 22, the third portion 23, and the fourth portion 24. The first portion 21 extends through the first through-hole 13, while the second portion 22, connected to the first portion 21, extends from one side of the first through-hole 13 generally along the surface of the bottom 11 towards the protrusion 12. The second portion 22 is positioned such that its surface S faces the bottom 11 of the light guide 10. The third portion 23, connected to the second portion 22, extends from one side of the protrusion 12 towards the opposite side. The protrusion 12 on the other side extends in the direction of the second part 22 and the third part 23, wherein the connection between the second part 22 and the third part 23 has a bend, so that the surface S of the third part 23 is arranged facing away from the bottom 11 of the light guide 10. Then, the fourth part 24 connected to the third part 23 extends from the protrusion 12 on one side toward the first through hole 13 and generally along the direction of the bottom 11 surface, wherein the connection between the third part 23 and the fourth part 24 has a bend, so that the surface of the fourth part 24 is arranged facing the bottom 11 of the light guide 10.

[0024] The plurality of light-emitting elements 30 are disposed on the flexible circuit board 20 and electrically connected to at least one electrical signal transmission line on the flexible circuit board 20, and face the light guide 10. The plurality of light-emitting elements 30 may be LEDs; for example... Figure 3 As shown, the plurality of light-emitting elements 30 are respectively disposed on the surface S of the second portion 22 and the fourth portion 24 of the flexible circuit board 20 and located in the first through hole 13, as shown. Figure 4 As shown, in this embodiment, the number of the plurality of light-emitting elements 30 is illustrated by example as four, and the first perforation 13 is illustrated by example as a square hole, with each of the light-emitting elements 30 correspondingly disposed at the four corners of the first perforation 13. In practice, the number of light-emitting elements can also be two or more, and the shape of the first perforation can also be, for example, circular or other shapes, and each of the light-emitting elements can be disposed corresponding to the shape of the first perforation.

[0025] Please cooperate again. Figure 3 The fingerprint recognition chip 40 is disposed on the surface S of the third portion 23 of the flexible circuit board 20 and is electrically connected to at least one electrical signal transmission line on the flexible circuit board 20.

[0026] Furthermore, the fingerprint recognition module 1 includes a base 50, a glass cover 60, and a reflective element 70. The base 50 has a second space 51 and an opening 52 and a second through hole 53 respectively communicating with the second space 51. The light guide 10 is disposed in the second space 51, and the first through hole 13 is located at the position corresponding to the second through hole 53, so that the first part 21 of the flexible circuit board 20 can pass through the first through hole 13 and the second through hole 53 at the same time. The fingerprint recognition chip 40 is located at the opening 52, and the glass cover 60 is disposed on the base 50 and covers the opening 52. The fingerprint recognition chip 40 is connected to the glass cover 60.

[0027] The reflective element 70 is disposed outside the light guide 10 to reflect the light emitted by each of the light-emitting elements 30. The reflective element 70 has a third through-hole 71 positioned corresponding to the first through-hole 13. The opening area of ​​the third through-hole 71 is smaller than the opening area of ​​the first through-hole 13. The first portion 21 of the flexible circuit board 20 passes through the first through-hole 13, the third through-hole 71, and the second through-hole 53 sequentially to exit the support 50. Figure 4 As shown, each of the light-emitting elements 30 is arranged facing the reflective element 70, thereby achieving the effect of increasing the brightness of the light emission.

[0028] Please cooperate. Figure 6 This is a schematic diagram of the light guide 10A of a fingerprint recognition module according to another preferred embodiment of the present invention. In this embodiment, the fingerprint recognition module has a structure that is substantially the same as that of the fingerprint recognition module 1 in the above embodiment. The difference is that, in this embodiment, the light guide 10A has two light guide holes 14 communicating with the first space 121. The two light guide holes 14 are located at the bottom 11 of the light guide 10A, respectively disposed on opposite sides of the first through hole 13 and communicating with the first through hole 13. The number of light-emitting elements 30 is two, respectively disposed on the second part 22 and the fourth part 24 of the flexible circuit board 20, and as shown in the diagram. Figure 7 The light guides are located in the two light guide holes 14, as shown.

[0029] In addition, such as Figure 7As shown, each of the light guide holes 14 has a first section 141 and a second section 142 that are connected. The first section 141 is closer to the first through hole 13 than the second section 142. The first section 141 is elongated and the second section 142 is semi-circular. In this way, the light energy emitted by each of the light-emitting elements 30 is guided to the protrusion of the light guide 10 through the arc surface of the second section 142. Furthermore, the distance between the second section 142 and the protrusion 12 can be changed by adjusting the width of the first section 141, thereby improving the uniformity of light distribution. Moreover, through the aforementioned structural design of the light guide 10A, the present invention only requires two light-emitting elements to provide a uniform and bright light source, which has the effect of saving manufacturing costs.

[0030] Please cooperate. Figure 7 Define a first axis X and a second axis Y, with the first axis X being perpendicular to the second axis Y. The length D1 of the first perforation 13 on the first axis X is greater than the length D2 of the first perforation 13 on the second axis Y. The length D1 of the first perforation 13 on the first axis X is greater than the length D3 of each of the light guide holes 14 on the first axis X, and the length D2 of the first perforation 13 on the second axis Y is less than the length D4 of each of the light guide holes 14 on the second axis Y.

[0031] In this embodiment, the two light guide holes 14 of the light guide member 10A are described as communicating with the first through hole 13. In another embodiment, the two light guide holes 14 of the light guide member 10B can also be described as follows. Figure 8 As shown, the two light guide holes 14 of the light guide member 10B are semi-circular and respectively disposed on both sides of the first perforation 13, and can achieve the effect of uniformly guiding the light emitted by each of the light-emitting elements 30 to the protrusion of the light guide member 10B through the arc surface of the two light guide holes 14.

[0032] Please cooperate. Figure 9 and Figure 10This is a schematic diagram of the light guide 10C of a fingerprint recognition module according to another preferred embodiment of the present invention. In this embodiment, the fingerprint recognition module has a structure that is substantially the same as that of the fingerprint recognition module in the above embodiment. The difference is that, in this embodiment, the bottom 11 of the light guide 10C has a light guide recess 15 on the side facing the first space 121 for accommodating the plurality of light-emitting elements 30. The light guide recess 15 has two first recesses 151 and a plurality of second recesses 152. The two first recesses 151 are respectively connected to the first through hole 13. The two sides are connected, and the plurality of second recesses 152 are located further away from the first through hole 13 compared with the first recess 151. The plurality of second recesses 152 are arranged at equal intervals. There are multiple light-emitting elements 30. Each second recess 152 is used to accommodate a corresponding light-emitting element 30. In this embodiment, four second recesses 152 are used as an example. In other embodiments, the number of second recesses may be two or more. In practice, it is not excluded that the second recesses are not provided, but the light-emitting elements are provided in the first recess.

[0033] In summary, the advantage of this invention is that, by having the first perforation 13 at the bottom of the light guide 10, the first portion 21 of the flexible circuit board 20 disposed in the light guide 10 can pass through the first perforation 13. In this way, the first portion 21 of the flexible circuit board 20 passing through the first perforation 13 can be prevented from blocking the light-emitting path from the light-emitting element 30 to the protrusion 12, thereby improving the light-emitting brightness and light-emitting uniformity, and thus achieving the purpose of clearly indicating the recognition area of ​​the user's fingerprint recognition module.

[0034] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the claims should be included within the patent scope of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] [This invention]

[0037] 1: Fingerprint recognition module

[0038] 10, 10A, 10B, 10C: Light guide components

[0039] 11: Bottom

[0040] 12: Tokigaki

[0041] 121: First Space

[0042] 13: First perforation

[0043] 14: Light guide hole

[0044] 141: First Section

[0045] 142: Second Section

[0046] 15: Light guide concave part

[0047] 151: First recess

[0048] 152: Second recess

[0049] 20: Flexible Circuit Board

[0050] 21: First part

[0051] 22: Second part

[0052] 23: Third part

[0053] 24: Fourth part

[0054] 30: Light-emitting element

[0055] 40: Fingerprint recognition chip

[0056] 50: Support

[0057] 51: The Second Space

[0058] 52: Opening

[0059] 53: Second perforation

[0060] 60: Glass cover plate

[0061] 70: Reflective element

[0062] 71: Third perforation

[0063] S: Surface

[0064] X: First axis

[0065] Y: Second axis

Claims

1. A fingerprint recognition module, comprising: A light guide is made of a light-transmitting material and includes a bottom and a protrusion surrounding and connecting the bottom, wherein the protrusion surrounds and forms a first space, and the light guide has two light guide holes communicating with the first space, and a first through hole communicating with the first space is formed at or near the center of the bottom. A flexible circuit board is disposed in the first space. The flexible circuit board is provided with at least one electrical signal transmission line, and the flexible circuit board has a first part, a second part, a third part and a fourth part connected in sequence. The first part extends out from the first through hole. The third part faces away from the bottom of the light guide. The second part and the fourth part face the bottom of the light guide and are located between the third part and the bottom. Two light-emitting elements are respectively disposed on the flexible circuit board and electrically connected to at least one electrical signal transmission line on the flexible circuit board, and are respectively located in the two light guide holes; as well as A fingerprint recognition chip is disposed at the third portion of the flexible circuit board and is electrically connected to at least one electrical signal transmission line on the flexible circuit board.

2. The fingerprint recognition module as described in claim 1, wherein, The device includes a support having a second space and an opening and a second through hole communicating with the second space; a light guide is disposed in the second space, and the first through hole is located at a position corresponding to the second through hole; the first portion of the flexible circuit board passes through both the first through hole and the second through hole; and the fingerprint recognition chip is located in the second space adjacent to the opening.

3. The fingerprint recognition module as described in claim 1, wherein, The two light guide holes are located at the bottom of the light guide, and the two light-emitting elements are respectively disposed on the second part and the fourth part of the flexible circuit board.

4. The fingerprint recognition module as described in claim 1, wherein the two light guide holes are respectively disposed on opposite sides of the first perforation.

5. The fingerprint recognition module as described in claim 1, wherein, Each of the light guide holes is semi-circular.

6. The fingerprint recognition module as described in claim 1, wherein, Each of the light guide holes has a first section and a second section that are connected. The first section is closer to the first through hole than the second section. The first section is elongated and the second section is semi-circular.

7. The fingerprint recognition module as described in claim 4, wherein, The two light guide holes are connected to the first perforation.

8. The fingerprint recognition module as described in claim 2, wherein, It includes a glass cover plate disposed on the support and covering the opening.

9. The fingerprint recognition module as described in claim 8, wherein, The fingerprint recognition chip is connected to the glass cover.

10. A fingerprint recognition module, comprising: A light guide is made of a light-transmitting material and includes a bottom and a protrusion surrounding and connecting the bottom, wherein the protrusion surrounds and forms a first space, and the light guide has a first perforation at the bottom. A flexible circuit board is disposed in the first space and has at least one electrical signal transmission line, and has a first part, a second part, a third part and a fourth part connected in sequence; the first part extends out from the first through hole; the third part faces away from the bottom of the light guide; the second part and the fourth part face the bottom of the light guide and are located between the third part and the bottom. Multiple light-emitting elements are disposed on the flexible circuit board and electrically connected to at least one electrical signal transmission line on the flexible circuit board, and are oriented toward the light guide; as well as A fingerprint recognition chip is disposed at the third portion of the flexible circuit board and is electrically connected to at least one electrical signal transmission line on the flexible circuit board.

11. The fingerprint recognition module as described in claim 10, wherein, The device includes a support, the support having a second space and an opening and a second through hole communicating with the second space; the light guide is disposed in the second space, and the first through hole is located at the position corresponding to the second through hole, so that the first part of the flexible circuit board passes through the first through hole and the second through hole simultaneously; the fingerprint recognition chip is located at the opening.

12. The fingerprint recognition module as described in claim 10, wherein, The light guide includes a reflective element disposed outside the light guide, and the reflective element has a third through hole corresponding to the first through hole, and the first part of the flexible circuit board passes through both the first through hole and the third through hole.

13. The fingerprint recognition module as described in claim 10, wherein, The plurality of light-emitting elements are located in the first perforation.

14. The fingerprint recognition module as described in claim 10, wherein, The light guide has two light guide holes, and the plurality of light-emitting elements are respectively located in the two light guide holes.

15. The fingerprint recognition module as described in claim 14, wherein, The two light guide holes are located at the bottom.

16. The fingerprint recognition module as described in claim 14, wherein, The two light guide holes are respectively located on opposite sides of the first perforation.

17. The fingerprint recognition module as described in claim 16, wherein, The two light guide holes are connected to the first through hole.

18. The fingerprint recognition module as described in claim 14, wherein, Each of the light guide holes is semi-circular.

19. The fingerprint recognition module as described in claim 14, wherein, Each of the light guide holes has a first section and a second section that are connected. The first section is closer to the first through hole than the second section. The first section is elongated and the second section is semi-circular.

20. The fingerprint recognition module as described in claim 11, wherein, It includes a glass cover plate disposed on the support and covering the opening.

21. The fingerprint recognition module as described in claim 20, wherein, The fingerprint recognition chip is connected to the glass cover.

22. The fingerprint recognition module as described in claim 10, wherein, The bottom side of the light guide member facing the first space has a light guide recess for accommodating the plurality of light-emitting elements.

23. A light guide element made of a light-transmitting material, wherein the light guide element comprises a bottom and a convex wall surrounding and connecting the bottom, characterized in that: The protruding wall surrounds a first space, and the bottom has a first perforation located at or near the center of the space, and the first perforation connects the first space to the outside of the light guide. The bottom side of the light guide member facing the first space has a light guide recess that is recessed from the bottom surface to accommodate the light-emitting element. The light guide recess has two first recesses and a plurality of second recesses. The two first recesses are respectively connected to the opposite sides of the first perforation. The plurality of second recesses are connected to the first recesses and are located further away from the first perforation than the first recesses. Each second recess is used to accommodate a corresponding light-emitting element.

24. The light guide as claimed in claim 23, wherein, It also has two light guide holes on the bottom.

25. The light guide as claimed in claim 24, wherein, The two light guide holes are respectively located on opposite sides of the first perforation.

26. The light guide as claimed in claim 25, wherein, The two light guide holes are respectively connected to the first through hole.

27. The light guide as claimed in claim 25, wherein, Each of the light guide holes is semi-circular.

28. The light guide as claimed in claim 25, wherein, Each of the light guide holes has a first section and a second section that are connected. The first section is closer to the first through hole than the second section. The first section is elongated and the second section is semi-circular.

29. The light guide as claimed in claim 25, wherein, Define a first axis and a second axis, with the first axis perpendicular to the second axis. The length of the first perforation in the first axis is greater than the length of the first perforation in the second axis. The length of the first perforation in the first axis is greater than the length of each of the light guide holes in the first axis, and the length of the first perforation in the second axis is less than the length of each of the light guide holes in the second axis.

30. The light guide as claimed in claim 23, wherein, The plurality of second recesses are arranged at equal intervals.

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