TWI566187B - Fingerprint identification unit - Google Patents

Description

Fingerprint identification unit

A fingerprint identification unit, in particular, a fingerprint recognition unit directly integrated on a touch panel, a color filter (CF), a thin film transistor (Thin-Film Transistor, TFT), and a liquid crystal module (Liquid Crystal Module) , LCM), on any one of them, to improve the fingerprint identification accuracy of the fingerprint identification unit.

With the rapid development of multimedia technology, more and more smart portable electronic devices such as mobile phones, personal digital assistants (PDAs), digital cameras, personal notebook computers or tablets or wearable devices have become people. A must-have tool in life. However, these portable electronic devices are highly personal. Therefore, once these portable electronic devices are stolen or lost, the information stored therein, such as phone books, photos, materials, etc., may be used by others, causing unnecessary losses.

Therefore, such products need to be matched with certain identity authentication and permission management to ensure the privacy of users. The main method of identity authentication currently used is password protection, and the user needs to input the correct password to the portable electronic device before entering the control page of the portable electronic device. However, password protection is less secure because passwords are more likely to be compromised or compromised. And if the user forgets the password, it is also very troublesome. Therefore, there is a portable electronic device that uses fingerprint identification for identity authentication. Since each person's fingerprints are different, the unique characteristics of the fingerprints make the security of identity authentication using fingerprint recognition much improved. Moreover, the method of using identity authentication using fingerprint identification is relatively convenient, so that the user can save the cumbersome memory and password entry.

The current fingerprint identification system is widely used in handheld devices or mobile devices. The most common fingerprint identification devices are independently designed, for example, on a fixed side of a notebook computer keyboard or a fixed position on the back side or the bottom side of a hand-held mobile device. It cannot be effectively integrated on the touch screen of the handheld mobile device to reduce the volume of the handheld mobile device, and the conventional fingerprint identification chip package module mainly includes a substrate, a wafer and a mold body. The wafer is disposed on the substrate and electrically connected to the substrate, and the mold body covers the surface of the substrate and the wafer.

In the prior art, the sensing circuit and the metal trace or the chip must be disposed on a substrate made of a single wafer, integrated into a fingerprint identification unit, and then combined with a touch panel or other device. The overall thickness of the fingerprint identification unit provided by the known technology is also thick, and it is easy to integrate the thinner device due to the thickness affecting the accuracy of the fingerprint identification and the thickness consideration.

Furthermore, when the finger touches the sensing region of the wafer, the wafer package is covered with a multilayer film, so that the overall thickness of the chip package module is high, and the chip package module has low sensitivity.

In addition, the conventional slip fingerprint identification system has directionality, and the recognition time is too long and must be set independently, which is very poor in structural integration or ease of use.

Therefore, in order to effectively solve the above problems, the main object of the present invention is to provide a fingerprint recognition unit directly integrated on a touch panel, a color filter (CF), a thin film transistor (Thin-Film). A fingerprint identification unit integrated into any one of a Transistor (TFT) and a Liquid Crystal Module (LCM).

In order to achieve the above object, the present invention provides a fingerprint identification unit formed on a base;

The base has an upper side and a lower side, and the fingerprint identification unit is selected to be disposed on any of the upper and lower sides.

The fingerprint identification unit has a first cladding layer, a first fingerprint identification electrode layer, a second cladding layer, a second fingerprint identification electrode layer, a wire layer, and a third cladding layer;

The first cladding layer is disposed on any one of the first and second planes; the first fingerprint recognition electrode layer is disposed on a side of the first cladding layer opposite to the base portion, and the first fingerprint identification electrode layer has a plurality of first fingerprint recognition electrodes; the second cladding layer covers the first fingerprint recognition electrode layer; the second fingerprint recognition electrode layer is disposed on a side of the second cladding layer opposite to the first fingerprint identification electrode layer, The second fingerprint identifying electrode layer has a plurality of second fingerprint identifying electrodes; the wire layer has a plurality of metal wires, and the metal wires are electrically connected to the first and second fingerprint identifying electrode layers; the third covering layer Covering the second fingerprint identification electrode layer and a part of the wire layer.

Through the invention, the fingerprint identification unit is directly integrated and manufactured on a touch panel, a color filter (CF), a thin film (Thin-Film Transistor, TFT), and a liquid crystal module (LCM). In any of the above, not only the elasticity of the overall design of the display device can be increased, but also the fingerprint identification unit can be improved in thickness due to the thickness reduction.

1‧‧‧Fingerprint identification unit

11‧‧‧First coating

12‧‧‧First fingerprint identification electrode layer

121‧‧‧First fingerprint identification electrode

13‧‧‧Second coating

14‧‧‧Second fingerprint identification electrode layer

141‧‧‧Second fingerprint recognition electrode

15‧‧‧Wire layer

151‧‧‧Metal wire

16‧‧‧ Third coating

2‧‧‧ base

21‧‧‧ upper side

22‧‧‧ Lower side

23‧‧‧ glass substrate

231‧‧‧ first surface

2311‧‧‧ touch area

2312‧‧‧ Non-touch area

232‧‧‧ second surface

24‧‧‧Touch electrode layer

241‧‧‧First touch electrode

242‧‧‧Second touch electrode

243‧‧‧Metal routing

25‧‧‧First insulation

26‧‧‧Second insulation

27‧‧‧First touch electrode layer

28‧‧‧Second touch electrode layer

29‧‧‧metal trace layer

3‧‧‧shading layer

1 is an exploded perspective view of a first embodiment of a fingerprint recognition unit of the present invention;

1A is a perspective partial enlarged view of the first embodiment of the fingerprint identification unit of the present invention;

1B is a perspective partial enlarged view of the first embodiment of the fingerprint identification unit of the present invention;

Figure 2 is a cross-sectional view showing the combination of the first embodiment of the fingerprint recognition unit of the present invention;

Figure 3 is a sectional view showing a combination of the second embodiment of the fingerprint recognition unit of the present invention;

Figure 4 is a schematic diagram of the first and second fingerprint recognition electrodes of the fingerprint identification unit of the present invention;

Figure 5 is a schematic diagram of the first and second fingerprint recognition electrodes of the fingerprint identification unit of the present invention.

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings.

1 , 1A, 1B, and 2 are a perspective exploded view, a partially enlarged view, and a combined cross-sectional view of a first embodiment of the fingerprint recognition unit of the present invention. As shown in the figure, the fingerprint identification unit 1 of the present invention is formed. On the base 2, the base 2 is a color filter (CF), a thin film transistor (TFT), a liquid crystal module (LCM), and a touch panel. Either.

The base portion 2 has an upper side 21 and a lower side 22, and the base portion 2 of the embodiment is a touch panel as an illustrative embodiment, but is not limited thereto, and the fingerprint identification unit 1 is selectively disposed on the upper and lower sides. 21, 22, the touch panel (base 2) comprises: a glass substrate 23, a touch electrode layer 24, a first insulating layer 25, a second insulating layer 26, a shielding layer 3;

The glass substrate 23 has a first surface 231 and a second surface 232 and defines a touch area 2311 and a non-touch area 2312 on the first surface 231. The non-touch area 2312 is adjacent to the touch. In the control area 2311, the shielding layer 3 is selected from any of the non-touch areas 2312 of the first and second surfaces 231 and 232, and the touch electrode layer 24 is disposed on the first surface 231 of the glass substrate 23. The control electrode area 2311; the touch electrode layer 24 has a plurality of first touch electrodes 241 and a plurality of second touch electrodes 242 and a plurality of metal traces 243, and the first and second touch electrodes 241 and 242 are selected and The metal traces 243 are electrically connected to each other; the first insulating layer 25 covers the intersection of the first and second touch electrodes 241 and 242; the second insulating layer 26 covers the touch electrode layer 24 and the first insulating layer. 25.

The fingerprint identification unit 1 has a first cladding layer 11, a first fingerprint identification electrode layer 12, a second cladding layer 13, a second fingerprint identification electrode layer 14, a wire layer 15, and a Third cladding layer 16;

The first cladding layer 11 is disposed on the touch panel (base portion 2) and on the lower side 21, 22; the first fingerprint recognition electrode layer 12 is disposed on the first cladding layer 11 instead. One side of the touch panel (base 2), the first fingerprint recognition electrode layer 12 has a plurality of first fingerprint recognition electrodes 121; the second cladding layer 13 covers the first fingerprint identification electrode layer 12; The fingerprint identification electrode layer 14 is disposed on one side of the second cladding layer 13 opposite to the first fingerprint recognition electrode layer 12, and the second fingerprint recognition electrode layer 14 has a plurality of second fingerprint recognition electrodes 141; the wire layer 15 has a plurality of metal wires 151, and the metal wires 151 are selectively electrically connected to the first and second fingerprint electrode layers 12 and 14; the third cladding layer 16 covers the second fingerprint electrode layer 14 and a portion of the wires Layer 15.

The invention mainly improves the conventional fingerprint identification unit which can be independently manufactured on the silicon wafer and then integrated with the touch panel or other devices to perform the fingerprint identification function.

Referring to FIG. 3, it is a sectional view of a combination of the second embodiment of the fingerprint identification unit of the present invention. As shown in the figure, the structural features of the embodiment are the same as those of the first embodiment, and therefore will not be The first embodiment differs from the first embodiment in that the touch panel (base 2) of the embodiment includes a glass substrate 23, a first touch electrode layer 27, and a first An insulating layer 25, a second touch electrode layer 28, a second insulating layer 26, a metal trace layer 29, a shielding layer 3;

The glass substrate 23 has a first surface 231 and a second surface 232 and defines a touch area 2311 and a non-touch area 2312 on the first surface 231. The non-touch area 2312 is adjacent to the touch. In the control area 2311, the shielding layer 3 is selected from any one of the non-touch areas 2312 of the first and second surfaces 231 and 232; the first touch electrode layer 27 is disposed on the second surface 232 of the glass substrate 23. The first touch electrode layer 27 has a plurality of first touch electrodes 271; the first insulating layer 25 covers the first touch electrode layer 27; the second touch electrode layer 28 is disposed on the first insulating layer The layer 25 is opposite to one side of the first touch electrode layer 27, the second touch electrode layer 28 has a plurality of second touch electrodes 281; the second insulating layer 26 covers the second touch electrode layer 28; The metal trace layer 29 is selectively electrically connected to the first and second touch electrode layers 27 and 28 .

In the first and second embodiments of the present invention, the first, second, and third cladding layers 11, 13, 16 are ruthenium dioxide films, and the adhesion of the entire layers is improved by the ruthenium dioxide film; The first and second fingerprint identifying electrodes 12, 14 can be any geometric shape of a circle, a square, a triangle, and a trapezoid.

Please refer to FIG. 4 , which is a schematic diagram of the first and second fingerprint recognition electrodes of the fingerprint identification unit of the present invention. As shown, the first fingerprint recognition electrodes 12 are connected to each other, and the second fingerprint recognition electrodes 14 are connected to each other. And the first and second fingerprint recognition electrodes have an area of 20 um ² to 50 um ² ; the first fingerprint recognition electrodes 12 extend longitudinally (refer to the base 2 of FIG. 1 ), and the first fingerprint recognition electrodes The spacing 12a between 12 is 10um~40um, and the optimal spacing between the first fingerprint identifying electrodes 12 is 38um; the second fingerprint identifying electrodes 14 extend laterally along the base 2 (see the base 2 of FIG. 1). The spacing 14a between the second fingerprint recognition electrodes 14 is 10 um to 40 um, and the optimal spacing between the second fingerprint recognition electrodes is 38 um; and the first and second fingerprint recognition electrodes 12 and 14 are transparent. electrode.

Please refer to FIG. 5 , which is another schematic diagram of the first and second fingerprint recognition electrodes of the fingerprint identification unit of the present invention. As shown in the figure, the lateral width of the first fingerprint recognition electrodes 12 is 10 um~30 um. The second fingerprint identification electrode has a longitudinal width of 10 um~30 um, and the first fingerprint recognition electrode 12 and the second fingerprint recognition electrode 14 are disposed corresponding to each other at a width of 12 um to a width of 10 um.

The fingerprint identification unit 1 of the present invention mainly thins the overall thickness of the fingerprint recognition unit by directly manufacturing components integrated on the touch panel or other display device to be disposed, and omits the use of the germanium substrate as a base material. In turn, the capacitance sensing amount is improved to improve the accuracy of the overall fingerprint identification.

The fingerprint identification unit 1 of the present invention is mainly formed by depositing a layer of ruthenium dioxide film on the surface or the plane of the touch panel (the base 2) to form the first identification layer. The layer 11 is used as a base layer for increasing the adhesion rate, and then a film which can be used as a material for the fingerprint identification sensing electrode is deposited on the first cladding layer 11 and then firstly etched by yellow etching. The fingerprint identification electrode 121 is completely disposed on the first cladding layer 11 and forms a plurality of metal wires 151 electrically connected to the first fingerprint recognition electrodes 121, and then a layer of ruthenium dioxide film is deposited to cover the formed shape. Forming a second cladding layer 13 as an insulating layer on the first fingerprint identifying electrode 121, and depositing a film on the second cladding layer 13 as a material for use as a fingerprint sensing electrode. The second fingerprinting electrodes 141 are completely disposed on the second cladding layer 13 by a yellow light etching, and a portion and the second fingerprint recognition electrodes 141 are formed. Such second fingerprint electrode 151 connected to a plurality of metal wires, and finally depositing a layer of silicon dioxide covering the film 141 has been formed in the first and the third cladding layer 16 is used as the insulating package 151 such metal wire.

Through the fingerprint recognition unit 1 of the present invention, the fingerprint recognition unit 1 can be disposed at any place where it is desired to be installed, and it is not necessary to further reduce the manufacturing cost by using the silicon wafer as a substrate, and the fingerprint identification unit 1 can be thinned. And reducing the spacing between the sensing electrodes, thereby improving the accuracy of the fingerprint identification.

1‧‧‧Fingerprint identification unit

11‧‧‧First coating

12‧‧‧First fingerprint identification electrode layer

121‧‧‧First fingerprint identification electrode

13‧‧‧Second coating

14‧‧‧Second fingerprint identification electrode layer

141‧‧‧Second fingerprint recognition electrode

15‧‧‧Wire layer

151‧‧‧Metal wire

16‧‧‧ Third coating

2‧‧‧ base

21‧‧‧ upper side

22‧‧‧ Lower side

23‧‧‧ glass substrate

231‧‧‧ first surface

2311‧‧‧ touch area

2312‧‧‧ Non-touch area

232‧‧‧ second surface

24‧‧‧Touch electrode layer

241‧‧‧First touch electrode

242‧‧‧Second touch electrode

243‧‧‧Metal routing

25‧‧‧First insulation

26‧‧‧Second insulation

3‧‧‧shading layer

Claims (9)

A fingerprint identification unit is formed on a base: a base having an upper side and a lower side; a fingerprint identification unit does not need to pass through a wafer as a substrate, and the fingerprint identification unit has: a coating layer is disposed on any one of the upper and lower sides; a first fingerprint identification electrode layer is disposed on a side of the first cladding layer opposite to the base portion, and the first fingerprint identification electrode layer has a plurality of a fingerprint recognition electrode; a second cladding layer covering the first fingerprint recognition electrode layer; and a second fingerprint recognition electrode layer disposed on a side of the second cladding layer opposite to the first fingerprint identification electrode layer, The second fingerprint identifying electrode layer has a plurality of second fingerprint identifying electrodes; a wire layer having a plurality of metal wires, and the metal wires are electrically connected to the first and second fingerprint identifying electrode layers; and a third covering layer And covering the second fingerprint identification electrode layer and a part of the wire layer, wherein the first, second and third coating layers are ruthenium dioxide films. The fingerprint identification unit of claim 1, wherein the base is a touch panel, comprising: a glass substrate having a first surface and a second surface, and the first surface Defining a touch area and a non-touch area, wherein the non-touch area is adjacent to the touch area; and a masking layer is selected from any one of the first and second surfaces of the non-touch area; The electrode layer is disposed on the second surface of the glass substrate, the touch electrode layer has a plurality of first touch electrodes and a plurality of second touch electrodes and a plurality of metal traces, and the first and second touch electrode systems are selected The metal traces are electrically connected; a first insulating layer covering the first and second touch electrode junctions; and a second insulating layer covering the touch electrode layer and the first insulating layer. The fingerprint identification unit of claim 1, wherein the base is a touch panel, comprising: a glass substrate having a first surface and a second surface, and the first surface Defining a touch area and a non-touch area, the non-touch area is adjacent to the touch area; and a shielding layer is selected from any one of the first and second surfaces of the non-touch area; The touch electrode layer is disposed on the second surface of the glass substrate, the first touch electrode layer has a plurality of first touch electrodes; a first insulating layer covers the first touch electrode layer; and a second touch An electrode layer is disposed on a side of the first insulating layer opposite to the first touch electrode layer, the second touch electrode layer has a plurality of second touch electrodes, and a second insulating layer covers the second touch electrode a metal routing layer is electrically connected to the first and second touch electrode layers. The fingerprint identification unit of claim 1, wherein the first and second fingerprint identification electrodes are in any one of a circular shape, a square shape, a triangle shape, and a trapezoidal shape, and the first and second fingerprints are identified. The area of the electrode is 20um ² ~ 50um ² . The fingerprint identification unit of claim 1, wherein a spacing between the first fingerprint recognition electrodes is 10 um to 40 um, and an optimum spacing between the first fingerprint recognition electrodes is 38 um; the second The distance between the fingerprint recognition electrodes is 10 um to 40 um, and the optimal spacing between the second fingerprint recognition electrodes is 38 um. The fingerprint identification unit of claim 1, wherein the first and second fingerprint recognition electrodes are transparent electrodes. The fingerprint identification unit of claim 1, wherein the base is a color filter (CF), a thin film (Tin-Film Transistor, TET), and a liquid crystal module (Liquid Crystal Module). , LCM) Any. The fingerprint identification unit of claim 1, wherein the first fingerprint identification electrodes have a lateral width of 10 um to 30 um, and the second fingerprint recognition electrodes have a longitudinal width of 10 um to 30 um. The fingerprint identification unit of claim 8, wherein the first fingerprint identification electrode and the second fingerprint recognition electrode are disposed corresponding to each other at a lateral width of 10 um.