Touch panel with fingerprint recognition function and manufacturing method thereof

Abstract

A touch panel with fingerprint recognition function includes a glass substrate, a fingerprint recognition chip and a driving flexible board. The glass substrate has a surface including a touch sensing area and a fingerprint recognition area at different positions. The touch sensing area is etched to form a touch sensing circuit. The fingerprint recognition area is etched to form a fingerprint recognition circuit. At least one driving contact point on the surface electrically connects the touch sensing circuit and the fingerprint recognition circuit. The fingerprint recognition chip has multiple gold bumps connecting the fingerprint recognition circuit, so that the fingerprint recognition chip is combined to the surface of the glass substrate. The driving flexible board has at least one driving chip and a driving circuit electrically connected to the at least one driving chip. The driving circuit is combined to the driving contact point of the glass substrate.

Description

TECHNICAL FIELD

[0001] The present application relates to a touch panel; in particular, to a touch panel with fingerprint recognition function. BACKGROUND

[0002] It is known that touch modules have been widely applied and installed on portable electronic devices such as mobile phones, tablet computers or notebook computers, and users can quickly and effectively perform input of control instructions by touching the touch module. In addition, in order to improve the accuracy of user identity recognition and / or the security of user identity authentication, fingerprint recognition modules have been widely provided on electronic devices in recent years.

[0003] However, in the current technical means, the touch module and the fingerprint recognition module are usually independent modules. For example, the touch module and the fingerprint recognition module are usually designed and manufactured independently, and are respectively arranged on different control areas of the notebook computer after completing the packaging process. Therefore, how to develop a device that can meet the needs of touch and fingerprint recognition is a problem to be solved. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a touch panel with fingerprint recognition function, which can simplify the manufacturing process and provide a touch panel integrated with touch and fingerprint recognition functions.

[0005] To achieve the above purpose, the present application provides a touch panel with fingerprint recognition function, which comprises a glass substrate, a fingerprint recognition chip and a drive flexible board. The glass substrate has a surface comprising a touch sensing area and a fingerprint recognition area at different positions. The touch sensing area is etched to form a touch sensing circuit, and the fingerprint recognition area is etched to form a fingerprint recognition circuit. At least one drive contact point on the surface electrically connects the touch sensing circuit and the fingerprint recognition circuit. The fingerprint recognition chip has a plurality of Au bumps connected to the fingerprint recognition circuit, so that the fingerprint recognition chip is combined to the surface of the glass substrate. The drive flexible board has at least one drive wafer and a drive circuit electrically connected to the at least one drive wafer, and the drive circuit is combined to the drive contact point of the glass substrate.

[0006] The present application also provides a manufacturing method of a touch panel with fingerprint recognition function. The method includes providing a glass substrate with a surface including a touch sensing area and a fingerprint recognition area at different positions, etching a touch sensing circuit on the touch sensing area, etching a fingerprint recognition circuit on the fingerprint recognition area, and electrically connecting the touch sensing circuit and the fingerprint recognition circuit through at least one driving contact on the surface. The method also includes providing a fingerprint recognition chip with a plurality of Au bumps, combining the fingerprint recognition chip to the surface of the glass substrate so that the Au bumps are connected to the fingerprint recognition circuit, and providing a driving soft board with at least one driving wafer and a driving circuit electrically connected to the at least one driving wafer, and combining the driving circuit of the driving soft board to the driving contact of the glass substrate.

[0007] The present application integrates the touch and fingerprint recognition functions in the same block by arranging the touch sensing area and the fingerprint recognition area at different positions on the same glass substrate. The fingerprint recognition chip is directly combined to the surface of the glass substrate through the Au bumps connected to the fingerprint recognition circuit, so that the fingerprint recognition chip does not need to perform an additional packaging process, thereby achieving the effects of simplifying the process and reducing the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 A top view of a touch panel with fingerprint recognition function according to a preferred embodiment of the present application.

[0009] Figure 2 A partial component exploded view of the touch panel with fingerprint recognition function according to the preferred embodiment of the present application.

[0010] Figure 3 An enlarged view of a partial component of the touch panel with fingerprint recognition function according to the preferred embodiment of the present application.

[0011] Figure 4 An enlarged view of a partial component of the touch panel with fingerprint recognition function according to the preferred embodiment of the present application.

[0012] Figure 5 A 4-4 direction sectional view of the touch panel with fingerprint recognition function according to the preferred embodiment of the present application. Figure 1

[0013] Figure 6 A flow chart of a manufacturing method of the touch panel with fingerprint recognition function according to the preferred embodiment of the present application. DETAILED DESCRIPTION

[0014] ​In order to more clearly illustrate the application, preferred embodiments will be described in detail with reference to the following drawings. Please refer to Figures 1 to 5 Fig. 1 shows a touch panel with fingerprint recognition function according to a preferred embodiment of the present application. The touch panel with fingerprint recognition function 1 comprises a glass substrate 10, a fingerprint recognition chip 20 and a driving flexible board 30. The fingerprint recognition chip 20 is, for example, a capacitive sensing element, which is used to sense the intensity of fingerprint wave peak and wave valley charge to generate electronic signals, and thus the user information can be recognized.

[0015] The glass substrate 10 has a surface S, which comprises a touch sensing area 11 and a fingerprint recognition area 12 at different positions. The touch sensing area 11 is etched to form a touch sensing circuit 111, and the fingerprint recognition area 12 is etched to form a fingerprint recognition circuit 121. At least one driving contact point on the surface electrically connects the touch sensing circuit and the fingerprint recognition circuit.

[0016] In this embodiment, the fingerprint recognition area 12 is located at a corner of the touch sensing area 11 and substantially forms a rectangular area with the touch sensing area 11.

[0017] The touch sensing circuit 111 and the fingerprint recognition circuit 121 can be, for example, ITO (indium tin oxide) etched circuits.

[0018] The driving flexible board has at least one driving chip 31 and a driving circuit electrically connected to the at least one driving chip 31. The driving circuit is combined with the driving contact point of the glass substrate. In this way, the driving chip 31 can drive the touch sensing circuit 111 and the fingerprint recognition chip 20 through the driving contact point 13. The number of driving chips 31 can be one or more. In this embodiment, the driving flexible board 30 is connected to the driving contact point 13 on the glass substrate 10 by ACF (Anisotropic Conductive Film) technology.

[0019] In this embodiment, the fingerprint recognition chip 20 is bonded to the glass substrate 10 using a chip-on-glass (COG) method. The fingerprint recognition chip 20 has multiple gold bumps 21 (Au bumps) connected to the fingerprint recognition circuit 121, so that the fingerprint recognition chip 20 is bonded to the surface S of the glass substrate 10. In this way, the fingerprint recognition chip 20 does not need to undergo an additional packaging process, thereby simplifying the process and reducing manufacturing costs.

[0020] It should be noted that, in this embodiment, a gold bump is used as an example. In other embodiments, it is not excluded that the fingerprint recognition line 121 may also be connected by, for example, solder bumps, copper bumps or other similar metal bumps.

[0021] like Figure 4 As shown, in this embodiment, the touch panel 1 with fingerprint recognition function includes two light sources 51 and a light guide element 40. The light guide element 40 is made of a light-transmitting material and is disposed adjacent to the two light sources 51. The light guide element 40 is located between the two light sources 51 and the fingerprint recognition chip 20. The light guide element 40 is ring-shaped, and the fingerprint recognition chip 20 is located in the space formed by the inner ring surface of the light guide element 40.

[0022] In this embodiment, the light guide element 40 is in the shape of a square ring and is arranged around the fingerprint recognition chip. In other embodiments, the light guide element 40 may also be in the shape of a ring of other shapes, such as a circle, which can also achieve the purpose of guiding the light emitted by the two light sources around the fingerprint recognition chip 20 to generate a uniform light ring around the fingerprint recognition chip 20, so as to indicate the position and state of the fingerprint recognition chip 20.

[0023] In this embodiment, the two light sources 51 are LED light sources, which are respectively located near the fingerprint recognition chip 20 and at the diagonal of the outer ring surface of the light guide element 40. In other embodiments, the number of light sources 51 may be one or more; the light sources 51 may also be located around the light guide element 40, and are not limited to the example of this embodiment.

[0024] The touch panel 1 with fingerprint recognition function includes a sealant, which is disposed around the fingerprint recognition chip 20 and located between the glass substrate 10 and the light guide element 40. In this embodiment, the sealant is described as a UV adhesive. In practice, the sealant can also be a thermosetting adhesive, a photocurable adhesive, or a combination thereof.

[0025] The touch panel 1 with the fingerprint recognition function comprises a light source flexible board 50, the light source flexible board 50 has the light source 51 and a light source circuit 52 (cooperating Figure 3 ), the light source circuit 52 is electrically connected to the two light sources 51; the glass substrate 10 further has a light source contact 14, and the light source circuit 52 is combined with the light source contact 14, the light source flexible board 50 is arranged on the fingerprint recognition chip 20, so that the fingerprint recognition chip 20 is located between the glass substrate 10 and the light source flexible board 50. Further, in the embodiment, the light source flexible board 50 is connected to the light source contact 14 on the glass substrate 10 by ACF (Anisotropic Conductive Film) technology.

[0026] Please cooperate Figure 6 , the manufacturing method flow chart of the touch panel 1 with the fingerprint recognition function of a preferred embodiment of the application, comprising the following steps:

[0027] Step S01, providing a glass substrate 10, the glass substrate 10 has a surface S comprising a touch sensing area 11 and a fingerprint recognition area 12 located at different positions, the touch sensing area 11 is etched to form a touch sensing circuit 111, the fingerprint recognition area 12 is etched to form a fingerprint recognition circuit 121; and the surface S has at least one driving contact 13 electrically connected to the touch sensing circuit 111 and the fingerprint recognition circuit 121. Wherein, the touch sensing area 11 is larger than the fingerprint recognition area 12, and the fingerprint recognition area 12 is located outside the touch sensing area 11.

[0028] Step S02, providing a fingerprint recognition chip 20, the fingerprint recognition chip 20 has a plurality of gold bumps 21 (Aubump); the fingerprint recognition chip 20 is combined to the surface S of the glass substrate 10 so that the gold bumps 21 (Aubump) are connected to the fingerprint recognition circuit 121.

[0029] Step S03, providing a driving flexible board 30, the driving flexible board 30 has at least one driving chip 31 and a driving circuit 32 electrically connected to the at least one driving chip 31; the driving circuit of the driving flexible board 30 is combined with the driving contact 13 of the glass substrate 10; in the embodiment, the driving flexible board 30 is connected to the driving contact 13 on the glass substrate 10 by ACF (Anisotropic Conductive Film) technology. Wherein, the execution sequence of the step S02 and the step S03 is not limited to the above embodiment.

[0030] The manufacturing method of the touch panel 1 with the fingerprint recognition function further comprises providing at least one light source 51 arranged adjacent to the fingerprint recognition chip 20 and providing a light guide element 40 made of a light-transmissive material and arranged adjacent to the at least one light source 51, wherein the light guide element 40 is located between the at least one light source 51 and the fingerprint recognition chip 20 and arranged around the fingerprint recognition chip 20, wherein the light guide element 40 is annular, the fingerprint recognition chip 20 is located in a space formed by an inner annular surface of the light guide element 40, and the at least one light source 51 is located on an outer annular surface of the light guide element 40. In the embodiment, the number of the at least one light source 51 is two, and the light guide element 40 is square annular, and the two light sources 51 are arranged at opposite corners of the light guide element 40 or around the light guide element 40.

[0031] The manufacturing method of the touch panel 1 with the fingerprint recognition function further comprises providing a light source flexible board 50, covering the light source flexible board 50 on the fingerprint recognition chip 20, so that the fingerprint recognition chip 20 is located between the glass substrate 10 and the light source flexible board 50, the light source flexible board 50 has the at least one light source 51 and a light source circuit 52 electrically connected to the at least one light source 51; the glass substrate 10 further has a light source contact 14, and the light source circuit 52 is combined with the light source contact 14.

[0032] The manufacturing method of the touch panel 1 with the fingerprint recognition function further comprises providing a sealing glue arranged around the fingerprint recognition chip 20 and located between the glass substrate 10 and the light guide element 40.

[0033] In summary, the application achieves the purpose of integrating the touch and fingerprint recognition functions in the same block by arranging the touch sensing area 11 and the fingerprint recognition area 12 at different positions on the same glass substrate 10. Furthermore, the design of directly combining the fingerprint recognition chip 20 to the surface S of the glass substrate 10 by connecting the fingerprint recognition circuit 121 to the gold bump 21 of the fingerprint recognition chip 20 enables the fingerprint recognition chip 20 to not need to perform the packaging process, thereby achieving the effects of simplifying the process and reducing the manufacturing cost.

[0034] The above description is only the preferred and feasible embodiments of the application, and equivalent changes made according to the description and the application scope of the application should be included in the patent scope of the application.

[0035] Legend of reference signs

[0036] [The application]

[0037] 1: touch panel with fingerprint recognition function

[0038] 10: glass substrate

[0039] 11: touch sensing area

[0040] 111: touch sensing line

[0041] 12: fingerprint recognition area

[0042] 121: fingerprint recognition line

[0043] 13: driving contact

[0044] 14: light source contact

[0045] 20: fingerprint recognition chip

[0046] 21: gold bump

[0047] 30: driving flexible board

[0048] 31: driving wafer

[0049] 40: light guide element

[0050] 50: light source flexible board

[0051] 51: light source

[0052] 52: light source line

[0053] S: surface

Claims

1. A touch panel with fingerprint recognition function, comprising: A glass substrate has a surface comprising a touch sensing area and a fingerprint recognition area at different positions, the touch sensing area is etched to form a touch sensing circuit, and the fingerprint recognition area is etched to form a fingerprint recognition circuit. a glass substrate having a surface, and at least one driving contact point on the surface electrically connecting the touch sensing circuit and the fingerprint recognition circuit; a fingerprint recognition chip having a plurality of Au bumps connecting the fingerprint recognition circuit, so that the fingerprint recognition chip is bonded to the surface of the glass substrate; a driving flexible board having at least one driving chip and a driving circuit electrically connecting the at least one driving chip, and the driving circuit is bonded to the driving contact point of the glass substrate; and at least one light source disposed adjacent to the fingerprint recognition chip. a light guide element made of light-transmissive material and disposed adjacent to the at least one light source. 2.The touch panel with a fingerprint recognition function of claim 1, wherein, The light guide element is located between the at least one light source and the fingerprint recognition chip. 3.The touch panel with a fingerprint recognition function of claim 2, wherein, The light guide element is disposed around the fingerprint recognition chip. 4.The touch panel with a fingerprint recognition function of claim 2, wherein, The light guide element is annular, and the fingerprint recognition chip is located in the space formed by the inner ring surface of the light guide element. 5.The touch panel with a fingerprint recognition function of claim 4, wherein, The at least one light source is located on the outer ring surface of the light guide element. 6.The touch panel with a fingerprint recognition function of claim 5, wherein, The number of the at least one light source is two, and the light guide element is square annular, and the two light sources are respectively disposed at opposite corners of the light guide element or around the light guide element.

7. The touch panel having a fingerprint recognition function according to claim 6, wherein, A light source flexible board having the at least one light source and a light source circuit electrically connecting the at least one light source; the glass substrate further has a light source contact point, and the light source circuit is bonded to the light source contact point. 8.The touch panel with a fingerprint recognition function of claim 1, wherein, The light source flexible board is disposed on the fingerprint recognition chip, so that the fingerprint recognition chip is located between the glass substrate and the light source flexible board.

9. The touch panel having a fingerprint recognition function according to claim 8, wherein, The touch sensing area is larger than the fingerprint recognition area, and the fingerprint recognition area is located outside the touch sensing area. 10.The touch panel with a fingerprint recognition function of claim 1, wherein, A sealant is disposed around the fingerprint recognition chip and between the glass substrate and the light guide element. 11.The touch panel with a fingerprint recognition function of claim 2, wherein, 12. A manufacturing method of a touch panel with fingerprint recognition function, comprising: a glass substrate having a surface, and at least one driving contact point on the surface electrically connecting the touch sensing circuit and the fingerprint recognition circuit; A glass substrate is provided, which has a surface comprising a touch sensing area and a fingerprint recognition area at different positions, the touch sensing area is etched to form a touch sensing circuit, and the fingerprint recognition area is etched to form a fingerprint recognition circuit. providing a fingerprint recognition chip having a plurality of Au bumps; bonding the fingerprint recognition chip to the surface of the glass substrate so that the plurality of Au bumps connect the fingerprint recognition circuit; providing a driving flexible board having at least one driving chip and a driving circuit electrically connecting the at least one driving chip; bonding the driving circuit of the driving flexible board to the driving contact point of the glass substrate; and at least one light source disposed adjacent to the fingerprint recognition chip. providing a light guide element made of light-transmissive material and disposed adjacent to the at least one light source. The light guide element is located between the at least one light source and the fingerprint recognition chip.

13. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 12, wherein, The light guide element is disposed around the fingerprint recognition chip.

14. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 13, wherein, The light guide element is annular, and the fingerprint recognition chip is located in the space formed by the inner ring surface of the light guide element.

15. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 13, wherein, ​ 16. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 15, wherein, ​ 17. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 16, wherein, The at least one light source is located on an outer ring surface of the light guide element.

18. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 17, wherein, The number of the at least one light source is two, and the light guide element is in a square ring shape, and the two light sources are respectively arranged at opposite corners of the light guide element or around the light guide element.

19. The method of claim 12, wherein the method further comprises: forming a plurality of first electrodes on the substrate; forming a plurality of second electrodes on the substrate; and forming a plurality of third electrodes on the substrate. The glass substrate further has a light source contact point, and the light source circuit is combined with the light source contact point.

20. The method of manufacturing the touch panel having a fingerprint recognition function according to claim 19, wherein, The light source flexible board is arranged on the fingerprint recognition chip, so that the fingerprint recognition chip is located between the glass substrate and the light source flexible board.

21. The method of manufacturing a touch panel having a fingerprint recognition function according to claim 12, wherein, The touch sensing area is larger than the fingerprint recognition area, and the fingerprint recognition area is located outside the touch sensing area.

22. The method of manufacturing a touch panel having a fingerprint recognition function according to claim 13, wherein, A sealant is arranged around the fingerprint recognition chip and between the glass substrate and the light guide element.

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