TW201827999A - Touch Device With A Fingerprint Sensing Element And Electronic Device With The Same - Google Patents

Abstract

The present invention relates to a touch device with a fingerprint sensing element and an electronic device with the same. It has a conductive element mounted on a side of the fingerprint sensing element. The conductive element connects to ground and has an antioxidant conductive surface. The antioxidant conductive surface and an end surface of the fingerprint sensing element form a contact surface for the user to touch by fingers. With the fingerprint sensing element having the antioxidant conductive surface, the antioxidant conductive surface is touched simultaneously when the user touches the fingerprint sensing element. Therefore, the noise can be eliminated and the ESD is effectively discharged to protect the interior circuit elements.

Description

Touch control device with fingerprint sensing element and electronic device

The invention relates to a touch device and an electronic device, in particular to a touch device and an electronic device having a fingerprint sensing element.

With the popularization of electronic devices, the security of data access to electronic devices has also received more and more attention. In addition to traditional passwords, biometric technology has become a powerful means of protecting information security. Among them are the characteristics of technology maturity and ease of use. , Fingerprint identification technology is currently commonly used as an information security protection method on electronic devices.

Please refer to FIG. 16. Taking a touch pad provided in a notebook computer to replace the mouse as an example, the fingerprint sensing element 70 and a cover 71 are disposed on a substrate 72, and the cover 71 surrounds the fingerprint sensor. Around the element 70, when the user only touches the finger with the fingerprint sensing element 70 of the electronic device, the user cannot share the ground with it. In this way, the noise interference cannot be eliminated because it is not floating. Fingerprint sensing accuracy. Please refer to FIG. 17A, which is a histogram of the binary induction quantity of the detected capacitance change. The horizontal axis is the induction quantity and the vertical axis is the number of pixel electrodes falling on the induction quantity, as shown in FIG. 17A. As shown in the figure, under the influence of noise, the number of pixel electrodes with zero sensing amount will be too much due to the influence of noise, which will cause the number of pixel electrodes that can be detected to be small. The image read by it (as shown in FIG. 17B) will be difficult to discriminate, which will affect the accuracy of fingerprint recognition.

Furthermore, as shown in FIG. 16, when the finger is charged with static electricity, ESD (Electrostatic Discharge, electrostatic discharge) will pass through the path P ₁ formed by the gap between the fingerprint sensing element 70 and the cover 71, and penetrate to the fingerprint sensing. The component 70 and other components on the substrate 72 cause the electronic device circuit to malfunction or even burn out.

In view of this, the present invention solves the problems of easy formation of common ground and susceptibility to ESD in the prior art.

In order to achieve the above-mentioned object of the present invention, the technical means adopted by the present invention is to create a touch device with a fingerprint sensing element, which is characterized in that it includes: a touch panel with a through hole; a fingerprint sensing element with a device Inside the through hole; and a conductive member disposed in the through hole and located between the inner wall surface of the through hole and the fingerprint sensing element, the conductive member is electrically connected to a ground terminal or a fixed potential, wherein The conductive member has an oxidation-resistant conductive surface, and the oxidation-resistant conductive surface forms a contact surface with an end surface of the fingerprint sensing element.

Furthermore, the present invention also creates an electronic device with a fingerprint sensing element, which is characterized in that it includes: a substrate having a ground terminal or a fixed potential; a fingerprint sensing element provided on the substrate; a conductive Piece, which has an anti-oxidation conductive surface, the conductive piece is provided on the substrate and forms an electrical connection with the ground terminal or fixed potential of the substrate, the conductive piece is provided at the periphery of the fingerprint sensing element, and the anti-oxidation piece The conductive surface forms a contact surface with the end surface of the fingerprint sensing element.

The advantage of the present invention is that a conductive member with an anti-oxidizing conductive surface is provided around the fingerprint sensing element. When a finger touches the fingerprint sensing element, the conductive member will be touched at the same time, and the finger will achieve the effect of common ground through the conductive member. It achieves the effect of eliminating noise interference, and also releases ESD through conductive parts, protecting the touchpad, fingerprint sensing element or other circuits on the substrate from ESD impact. Furthermore, the anti-oxidation conductive surface is provided to provide conductive effects under the premise that the conductive parts can be protected from being oxidized, thereby improving the effects of noise elimination and ESD venting.

In the following, with reference to the drawings and the embodiments of the present invention, the technical means adopted by the present invention to achieve the intended purpose of the present invention will be further explained.

Please refer to FIG. 1 to FIG. 3. An embodiment of the present invention is a touch device, which includes a touch panel 10, a fingerprint sensing element 20 and a conductive member 30.

The aforementioned touch panel 10 has a through hole 101. In one embodiment, the touchpad 10 includes a substrate 11 and a cover plate 12. The cover plate 12 is disposed on the substrate 11. In one embodiment, the cover plate 12 is attached to the substrate through a gel 13. On the substrate 11. The through hole 101 is provided in the cover plate 12, and the substrate 11 is provided with a ground terminal 111 or a fixed potential. The substrate 11 or the cover plate 12 is provided with a sensing layer for touch sensing.

The aforementioned fingerprint sensing element 20 is disposed in the through hole 101 of the touchpad 10. In one embodiment, the fingerprint sensing element 20 is disposed on the substrate 11 and connected to a circuit provided on the substrate 11. In order to provide a fingerprint identification function, the fingerprint sensing element 20 can use existing capacitive, optical, ultrasonic, and other types of fingerprint sensing sensors, which will not be described in detail here.

The aforementioned conductive member 30 is disposed in the through hole 101 and is correspondingly accommodated between the cover plate 12 and the fingerprint sensing element 20. The conductive member 30 is electrically connected to the ground terminal 111 or a fixed potential to provide Grounding effect. The conductive member 30 has an anti-oxidation conductive surface 31. The anti-oxidation conductive surface 31 is formed of a material having both an anti-oxidation effect and a conductive function. In one embodiment, the conductive member 30 is an integrated anti-oxidation conductive material For the formed conductive member 30, such as conductive rubber, please refer to the conductive rubber illustrated in Tables 1 and 2, but it is not limited thereto. The oxidation-resistant conductive surface 31 of the conductive member 30 integrally formed with conductive rubber is the exposed upper surface of the conductive member 30. Of course, the oxidation-resistant conductive surface 31 may also be the other surface of the conductive member 30 exposed. The conductive surface 31 and the end surface 21 of the fingerprint sensing element 20 form a contact surface at the through hole 101 for the user to touch. In one embodiment, the conductive member 30 is attached to the substrate 11 with a conductive adhesive 32. 【Table 1】 【Table 2】

In an embodiment, as shown in FIG. 2 and FIG. 3, the conductive member 30 surrounds the periphery of the fingerprint sensing element 20. When a user wants to touch the fingerprint sensing element 20 from any direction or angle, he will pass through The aforementioned touch surface simultaneously touches the fingerprint sensing element 20 and the conductive member 30. In an embodiment, as shown in FIGS. 4 and 5, the through hole 101 is formed at a corner of the cover plate 12, and the conductive member 30A is L-shaped and is provided between the fingerprint sensing element 20 and the through hole 101. Between the inner walls.

In order to prevent ESD from impacting the circuit on the substrate 11 and the fingerprint sensing element 20 through the gap formed between the conductive member 30 and the fingerprint sensing element 20 due to manufacturing tolerances, the present invention adopts the following several technical means, but does not use This is limited. In an embodiment, as shown in FIG. 6, the conductive member 30 made of conductive rubber has elasticity, and the cross-sectional width of the conductive member 30 is larger than the inner wall surfaces of the fingerprint sensing element 20 and the through hole 101. The conductive member 30 is tightly fitted between the fingerprint sensing element 20 and the inner wall surface of the through hole 101 to prevent a gap from occurring. In an embodiment, as shown in FIG. 7A and FIG. 7B, the conductive member 30 is formed with an extension portion 311 at an end portion provided with the oxidation-resistant conductive surface 31, and the extension portion 311 extends toward the through hole 101, and the The end surface 21 of the fingerprint sensing element 20 is provided with a lead angle 211 corresponding to the extension portion 311. When the extension portion 311 is matched with the lead angle 211, the oxidation-resistant conductive surface 31 and the end surface 21 are coplanar to form the contact surface. In an embodiment, as shown in FIGS. 8, 9A, and 9B, the extension portion 311B protrudes from the oxidation-resistant conductive surface 31 and covers a part of the end surface 21 of the fingerprint sensing element 20. The gap formed between the conductive member 30 and the fingerprint sensing element 20 due to manufacturing tolerances is covered by the aforementioned extensions 311 and 311B.

Please refer to FIG. 10 and FIG. 11, another embodiment of the present invention is an electronic device, which includes a substrate 40, a conductive member 50 and a fingerprint sensing element 60. The electronic device can be a fingerprint sensor module, which can be installed in other devices such as mobile phones and tablet computers.

The aforementioned substrate 40 is provided with a ground terminal or a fixed potential.

The aforementioned conductive member 50 is disposed on the substrate 40 and is electrically connected to the ground terminal or a fixed potential. The conductive member 50 has an anti-oxidation conductive surface 51. The anti-oxidation conductive surface 51 is formed of a material having both anti-oxidation effect and conductive function. In this embodiment, the conductive member 50 has a ring shape and has an accommodation space 52, but is not limited thereto. The conductive member 50 may also be a single C-ring conductive member or a plurality of arc-shaped elements arranged in a ring shape. . In one embodiment, the conductive member 50 is integrally formed of an oxidation-resistant conductive material, such as conductive rubber. In one embodiment, the conductive member 50 is adhered to the substrate 40 with a conductive adhesive 53.

The aforementioned fingerprint sensing element 60 is disposed on the substrate 40 and in the accommodating space 52. The oxidation-resistant conductive surface 51 and the end surface 61 of the fingerprint sensing element 60 form a contact surface for a user to touch.

In order to prevent ESD from impacting the fingerprint sensing element 60 through the gap formed between the conductive member 50 and the fingerprint sensing element 60 due to manufacturing tolerances, the present invention adopts the following several technical means, but is not limited thereto. In an embodiment, as shown in FIG. 12, since the conductive member 50 made of conductive rubber is elastic and the cross-sectional width of the fingerprint sensing element 60 is greater than the cross-sectional width of the accommodating space 52 of the conductive member 50, The fingerprint sensing element 60 is tightly fitted in the accommodating space 52 of the conductive member 50 to avoid gaps. In an embodiment, as shown in FIG. 13, the conductive member 50 is formed with an extension portion 511 at an end portion provided with the anti-oxidation conductive surface 51, the extension portion 511 extends toward the accommodation space 52, and the fingerprint sensing element The end surface 61 of 60 is provided with a lead angle 611 corresponding to the extension portion 511. When the extension portion 511 is matched with the lead angle 611, the oxidation-resistant conductive surface 51 and the end surface 61 are coplanar to form the contact surface. In an embodiment, as shown in FIG. 14, the extending portion 511C protrudes from the oxidation-resistant conductive surface 51 and covers a part of the end surface 61 of the fingerprint sensing element 60. The gap formed between the conductive member 30 and the fingerprint sensing element 60 due to manufacturing tolerances is covered by the aforementioned extensions 511 and 511C.

In summary, in the present invention, the conductive members 30 and 50 having the oxidation-resistant conductive surfaces 31 and 51 are provided on the sides of the fingerprint sensing elements 20 and 60, and the conductive members 30 and 50 pass through the touchpad 10 or the substrate. 40 ground, when a finger touches the end faces 21, 61 of the fingerprint sensing element 20, 60, it will touch the anti-oxidation conductive surface 31, 51 with good conductivity together to achieve the effect of common ground, which can effectively eliminate Noise interference. As shown in FIG. 15A, it is a histogram of the binary sensing quantity of the detected capacitance change, with the horizontal axis being the sensing quantity and the vertical axis being the pixel electrodes of the aforementioned fingerprint sensing elements 20 and 60 falling on the sensing. As shown in FIG. 15A, when the grounding quality is good, the aforementioned fingerprint sensing elements 20 and 60 can specifically detect the sensing amounts of the respective pixel electrodes, so the read image will not be miscellaneous. The interference is clearer, and a clear fingerprint recognition result as shown in FIG. 15B can be obtained. In addition, ESD is also leaked through the conductive members 30 and 50 to protect the touch panel 10 or the substrate 40 from the ESD impact.

The above description is only an embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed by the embodiments as above, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field of the art, Within the scope not departing from the technical solution of the present invention, when the above disclosed technical content can be used to make a few changes or modifications to equivalent equivalent embodiments, as long as it does not depart from the technical solution of the present invention, it is in accordance with the technical essence of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

10‧‧‧Touchpad

101‧‧‧through hole

11‧‧‧ substrate

12‧‧‧ Cover

13‧‧‧ Colloid

20‧‧‧Fingerprint sensor

21‧‧‧face

211‧‧‧lead angle

30, 30A‧‧‧Conductive parts

31‧‧‧Anti-oxidation conductive surface

311, 311B‧‧‧ extension

32‧‧‧Conductive Adhesive

40‧‧‧ substrate

50‧‧‧ conductive parts

51‧‧‧Anti-oxidation conductive surface

511, 511C‧‧‧ extension

52‧‧‧accommodation space

53‧‧‧Conductive Adhesive

60‧‧‧Fingerprint sensor

61‧‧‧face

611‧‧‧lead angle

70‧‧‧Fingerprint sensor

71‧‧‧ cover

72‧‧‧ substrate

FIG. 1 is an exploded perspective view of an embodiment of the present invention. FIG. 2 is an enlarged top view of the embodiment of FIG. 1. FIG. FIG. 3 is an enlarged side sectional view of the embodiment of FIG. 1. FIG. FIG. 4 is a top view of an embodiment of the present invention. FIG. 5 is an enlarged side sectional view of the embodiment of FIG. 4. FIG. FIG. 6 is an enlarged side sectional view of an embodiment of the present invention. 7A and 7B are enlarged side sectional views of an embodiment of the present invention. FIG. 8 is a top view of an embodiment of the present invention. 9A and 9B are enlarged sectional side views of the embodiment of FIG. 8. FIG. 10 is an exploded perspective view of an embodiment of the present invention. FIG. 11 is an enlarged side sectional view of the embodiment of FIG. 10. FIG. FIG. 12 is an enlarged side sectional view of an embodiment of the present invention. FIG. 13 is an enlarged side sectional view of an embodiment of the present invention. FIG. 14 is an enlarged side sectional view of an embodiment of the present invention. FIG. 15A is a waveform diagram of an induction signal according to the present invention. FIG. 15B is a diagram of a fingerprint identification result of the present invention. FIG. 16 is an enlarged side sectional view of the prior art. FIG. 17A is a waveform diagram of a conventional induction signal. FIG. 17B is a diagram of a fingerprint identification result in the prior art.

Claims (19)

A touch device with a fingerprint sensing element includes: a touch pad having a through hole; a fingerprint sensing element provided in the through hole; and a conductive member provided in the through hole and located at Between the inner wall surface of the through hole and the fingerprint sensing element, the conductive member is electrically connected to a ground terminal or a fixed potential, wherein the conductive member has an oxidation-resistant conductive surface. The touch device according to claim 1, comprising a contact surface, the contact surface including the oxidation-resistant conductive surface and an end surface of the fingerprint sensing element. The touch device according to claim 1, wherein the conductive member is formed with an extension at an end provided with an oxidation-resistant conductive surface, and the extension covers a part of an end surface of the fingerprint sensing element. The touch device according to claim 3, wherein the extending portion and the fingerprint sensing element respectively have corresponding lead angles corresponding to the peripheral edges of the conductive member, and the extending portion of the conductive member and the fingerprint sensing element have a lead angle. Angular fit. The touch device according to claim 1, wherein a cross-sectional width of the conductive member is greater than a cross-sectional width between the fingerprint sensing element and an inner wall surface of the through hole, and the conductive member is provided in a tight fit between the fingerprint sensing element and the Between the inner wall surfaces of the through hole. The touch device according to any one of claims 1 to 5, wherein the conductive member is a conductive member integrally formed of an oxidation-resistant conductive material. The touch device according to claim 6, wherein the anti-oxidation conductive material is conductive rubber. The touch device according to any one of 3, 4, and 5, comprising a contact surface, wherein the touchpad includes a substrate and a cover plate, and the cover plate and the fingerprint sensing element are disposed on the substrate. The ground terminal or the fixed potential is provided on the substrate, the through hole is provided on the cover plate, and the contact surface includes an upper surface of the cover plate, the oxidation-resistant conductive surface, and an end surface of the fingerprint sensing element. The touch device according to claim 8, wherein the conductive member is adhered to the substrate with a conductive adhesive, so that the oxidation-resistant conductive surface is electrically connected to the ground terminal or the fixed potential. The touch device according to any one of claims 1 to 5, wherein the conductive member surrounds a periphery of the fingerprint sensing element. An electronic device with a fingerprint sensing element is characterized in that it includes: a substrate having a ground terminal or a fixed potential; a fingerprint sensing element provided on the substrate; and a conductive member having a resistance The conductive surface is oxidized. The conductive member is disposed on the substrate and forms an electrical connection with a ground terminal or a fixed potential of the substrate. The conductive member is disposed at a periphery of the fingerprint sensing element. The electronic device according to claim 11, comprising a contact surface, the contact surface including the oxidation-resistant conductive surface and an end surface of the fingerprint sensing element. The electronic device according to claim 11, wherein an end portion of the oxidation-resistant conductive surface is formed with an extension portion, and the extension portion covers a part of an end surface of the fingerprint sensing element. The electronic device according to claim 13, wherein the extending portion of the oxidation-resistant conductive surface and the fingerprint sensing element corresponding to the peripheral edge of the conductive member are respectively provided with corresponding lead angles, and the extending portion of the conductive member and the fingerprint sensor The lead angles of the components are matched. The electronic device according to claim 11, wherein the fingerprint sensing element and the conductive member are tightly arranged. The electronic device according to any one of claims 11 to 15, wherein the conductive member is a conductive member integrally formed of an oxidation-resistant conductive material. The electronic device according to claim 16, wherein the anti-oxidation conductive material is a conductive rubber. The electronic device according to any one of claims 11 to 15, wherein the conductive member is adhered to the substrate with a conductive adhesive, so that the oxidation-resistant conductive surface is electrically connected to the ground terminal or the fixed potential. The electronic device according to any one of claims 11 to 15, wherein the conductive member is a C-ring conductive member, and the C-ring conductive member surrounds a part of the periphery of the fingerprint sensing element.