TWM477621U - Touch panel with fingerprint recognition function - Google Patents

Description

Touch panel with fingerprint recognition function

The present invention relates to a touch panel, and more particularly to a touch panel that integrates an identity recognition function with a touch function and reduces manufacturing costs.

Recently, a fingerprint reader is installed on the electronic product to identify the user's identity, and can provide a secure and easy login authentication mechanism, which can replace the traditional input password method, and the identification technology can make the online shopping different. The authentication mode is also used as a means for users to ensure security and convenience when using electronic products. However, the currently known fingerprint sensor is generally the first to identify the fingerprint IC. Combine with PCB boards and then provide applications designed for consumer usage habits.

Please refer to FIG. 4 , which is a mobile phone with a touch switch currently known in the market, which is mainly provided with a Home button on a mobile phone case 90 and a fingerprint identification mechanism inside the Home button for use. When the Home button is touched, the fingerprint is recognized, so the Home button can be directly unlocked at the same time; the Home button is a layered structure, which is mainly arranged from the outside to the inside of a sapphire crystal 91, a stainless steel detection The ring 92, a touch sensor 93 and a touch switch 94 are further provided with a ring of metal outer ring electrodes and an electrode layer to form an electrical connection, and the touch sensor 93 forms a fingerprint sensor. It is used to capture the user's fingerprint data for identity identification and security measures.

Referring to FIG. 5, the touch sensor 93 includes a sensing area 931, a vertical scanner 932, a horizontal scanner 933, a control unit 934, and a signal processing circuit 935. The control unit 934 is vertical and vertical. The scanner 932, the horizontal scanner 933, and the signal processing circuit 935 are electrically connected. The sensing region 931 is formed by arraying a plurality of rectangular metal sensing plates 9311, and is respectively associated with the vertical scanner 932 and the horizontal scanner. The 933 is electrically connected, and the sensing board 9311 senses the fingertip touch of the user, and detects the signal of the touched position through the vertical scanner 932 and the horizontal scanner 933, and is driven by the control unit 934, and The signal processing circuit 935 converts the measured user fingerprint data and outputs the signal; the signal processing circuit 935 further transmits an output signal representative of the fingerprint data to a processor 95 for performing a subsequent fingerprint identification process.

Referring to FIG. 6, the fingerprint identification process is performed on the processor 95. The fingerprint identification process includes the following steps: obtaining a fingerprint data output by the touch sensor 93 (S91); performing the fingerprint data. An image pre-processing, the fingerprint data obtained by the pre-image processing is enhanced to obtain high-quality fingerprint data (S92); the fingerprint feature value is extracted and adjusted The influence of displacement and angular offset will be reduced (S93); the eigenvalues of the fingerprint data will be compared to determine the similarities and differences of the fingerprint data (S94).

It can be seen from the above that the fingerprint identification technology currently applied to mobile phones is still quite complicated, the hardware manufacturing cost thereof is expensive, and the subsequent implementation of a complex fingerprint identification algorithm on the software is required, so the electronic application of the technology is applied. The product cannot reduce the price. However, for consumers, of course, they hope to sell at low prices. However, as can be seen from the above, the current production cost of related products is too high. Therefore, how to provide electronic product fingerprint identification technology at a lower cost is indeed necessary to further review and propose an ideal solution.

In view of the deficiencies of the prior art, the main purpose of the present invention is to provide a touch panel with fingerprint recognition function, which mainly integrates fingerprint identification technology on the touch panel to reduce manufacturing cost, power consumption, and material saving.

The main technical means for achieving the above-mentioned purpose is that the touch panel having the fingerprint recognition function includes: a substrate having a surface having a visible area and a non-visible area; and a touch sensing The layer is disposed in the visible area of the substrate; a capacitive fingerprint sensor is disposed on the non-visible area of the substrate; and a flexible circuit board is electrically connected to the touch sensing layer on the substrate, the flexible circuit board The cloth is provided with a fingerprint identification chip and is electrically connected to the capacitive fingerprint sensor.

With the above configuration, when the user touches the capacitive fingerprint sensor disposed on the non-visible area with a finger, the capacitive fingerprint sensor obtains a sensing signal representing the fingerprint data, and transmits the signal to the flexible circuit board through the flexible circuit board. The fingerprint recognition chip performs identification processing to confirm the user identity. Since the fingerprint sensor on the non-visible area is a capacitive touch sensing structure, it can be completed in the same process as the touch sensing layer to save the capacitive fingerprint sensor. The manufacturing cost is achieved, and the fingerprint identification chip is integrated with the flexible circuit board to save material and reduce manufacturing cost.

For a preferred embodiment of the touch panel having the fingerprint recognition function, please refer to FIG. 1 , which includes a substrate 10 , a touch sensing layer , a flexible circuit board 20 , and a capacitive fingerprint sensor 30 . .

The substrate 10 is made of a glass material and has a lower surface. The lower surface has a visible area 11 and a non-visible area 12 . The touch sensing layer is disposed on the visible area 11 of the substrate 10 , in this embodiment. The touch sensing layer includes a plurality of sensing electrodes and a plurality of signal lines, and the plurality of signal lines are electrically connected to the flexible circuit board 20.

The non-visible area 12 is located at the periphery of the visible area 11. In this embodiment, the non-visible area 12 is coated with an ink layer coated with ink on the periphery of the lower surface of the substrate 10. The capacitive fingerprint sensor 30 is provided. The non-visible area 12 having an ink layer is configured to scan and read the fingerprint data. The flexible circuit board 20 is disposed on the substrate 10 and electrically connected to the touch sensing layer and the capacitive fingerprint sensor 30. A fingerprint disc 21 is disposed on the flexible circuit board 20 and electrically coupled to the capacitive fingerprint sensor 30 via a plurality of signal conductors.

In the embodiment, the flexible circuit board 20 further includes a touch wafer 22 disposed adjacent to the fingerprint recognition chip 21 and electrically connected to the touch sensing layer through a plurality of signal wires for detecting the use. The touch position on the visible area 11.

In this embodiment, the capacitive fingerprint sensor 30 is strip-shaped and has a sensing surface 31. The area of the sensing surface 31 is much smaller than that of a general push sensor (such as the Apple Iphone 5S). The power consumption is relatively low, and the volume is smaller and more power-saving, and the price is relatively cheaper. When the sensing surface 31 is touched by the finger, the capacitive fingerprint sensor 30 transmits the captured fingerprint data. The signal wires are transmitted to the fingerprint recognition wafer 21 on the flexible circuit board 20 for subsequent fingerprint recognition processing.

Referring to FIG. 2, the specific structure of the capacitive fingerprint sensor 30 in this embodiment, wherein the capacitive fingerprint sensor 30 further includes a sensing layer opposite to the position of the sensing surface 31, the sensing layer is mainly A vertical sensing line 32 and a horizontal sensing line 33 are arranged in a staggered manner. The sensing lines 31 and 32 are respectively electrically connected to the flexible circuit board 20 through a plurality of signal lines, and the sensed fingerprint data is used. The flexible circuit board 20 is transferred to the above-described fingerprint recognition wafer 21.

It should be noted that, in this embodiment, the capacitive fingerprint sensor 30 has a length of 1.28 cm, a width of 0.05 cm, and a resolution of 500 dpi, and the sensing layer is made of metal or a transparent electrode. The shapes of the vertical sensing line 32 and the horizontal sensing line 33 of the layer are respectively designed to be composed of a plurality of rhombic electrodes connected in series. If the resolution is 500 dpi, the spacing of each diamond electrode is about 50 μm, and the signal line is The width is only a few μm, and the above-mentioned fine structure can be achieved by the advanced process technology of yellow etching, which makes it more widely used in fingerprint recognition, and can be easily integrated with the touch panel to become smaller and smaller. Power-saving low-priced embedded product. In this embodiment, the capacitive fingerprint sensor 30 refers to a strip fingerprint sensor.

To further illustrate the specific application mode of the embodiment, please refer to FIG. 3, based on the advantage of the capacitive fingerprint sensor 30 of the capacitive fingerprint sensor 30 being small and strip-shaped, due to the sensing area of the sensing surface 31 thereof. Compared with the user's finger, the fingerprint data of the segment captured in the unit time is transmitted to the fingerprint identification chip 21, and the fingerprint data of the representative segment is reconstructed to obtain a complete fingerprint data, and the complete fingerprint is reconstructed. In the data, the algorithm in the fingerprint identification chip 21 mainly uses the Statistical Absolute Difference (SAD) to find the correlation between the fingerprint data of two consecutive segments, so as to achieve the purpose of eliminating redundancy, and Fingerprint data is reorganized into complete fingerprint data of the user;

As shown in FIG. 3, after the user swipes the finger over the sensing surface 31, the capacitive fingerprint sensor 30 reassembles the captured fingerprint data to provide fingerprint identification wafer 21, and reconstructs the fragment fingerprint image into a complete fingerprint via an algorithm. In order to identify the user's fingerprint data characteristics to confirm the user's identity; since the capacitive fingerprint sensor 30 is a capacitive touch sensing technology, it can be simultaneously completed in the process of the touch sensing layer to effectively The manufacturing cost is saved, and the fingerprint identification chip 21 is integrated with the flexible circuit board 20 provided with the touch wafer 22, which simplifies the process of the process, saves materials, and reduces manufacturing costs.

10‧‧‧Substrate
11‧‧‧visible area
12‧‧‧Invisible area
20‧‧‧Soft circuit board
21‧‧‧Fingerprinting chip
22‧‧‧ touch chip
30‧‧‧Capacitive fingerprint sensor
31‧‧‧ Sensing surface
32‧‧‧Vertical sensing line
33‧‧‧ horizontal sensing line
90‧‧‧Mobile phone housing
91‧‧‧Sapphire crystal
92‧‧‧Stainless steel detection ring
93‧‧‧Touch sensor
931‧‧‧Sensing area
9311‧‧‧Sensor board
932‧‧‧Vertical Scanner
933‧‧‧ horizontal scanner
934‧‧‧Control unit
935‧‧‧Signal Processing Circuit
94‧‧‧Touch switch
95‧‧‧ processor

1 is a top plan view of a preferred embodiment of the present invention. 2 is a partially enlarged schematic view of a preferred embodiment of the present invention. 3 is a schematic diagram of an application state of a preferred embodiment of the present invention. Figure 4 is a diagram showing the appearance of a mobile phone with a fingerprint reader. FIG. 5 is a circuit block diagram of a known touch sensing layer. FIG. 6 is a flow chart of fingerprint identification of a known touch sensing layer device.

10‧‧‧Substrate

11‧‧‧visible area

12‧‧‧Invisible area

20‧‧‧Soft circuit board

21‧‧‧Fingerprinting chip

22‧‧‧ touch chip

30‧‧‧Capacitive fingerprint sensor

31‧‧‧ Sensing surface

Claims (9)

A touch panel having a fingerprint recognition function, comprising: a substrate having a surface having a visible area and a non-visible area; a touch sensing layer disposed in the visible area of the substrate; The capacitive fingerprint sensor is disposed on the non-visible area of the substrate; a flexible circuit board is electrically connected to the touch sensing layer on the substrate, and the flexible circuit board is provided with a fingerprint identification chip and the capacitive fingerprint The sensor is electrically connected. The touch panel has a fingerprint recognition function as claimed in claim 1, the flexible circuit board further comprising a touch chip, and is electrically connected to the touch sensing layer. The touch panel with fingerprint identification function according to claim 2, wherein the capacitive fingerprint sensor is strip-shaped and has a sensing surface and a sensing layer, and the sensing layer is opposite to the position of the sensing surface. The touch panel having the fingerprint recognition function according to claim 3, wherein the sensing layer is mainly composed of a vertical sensing line and a horizontal sensing line which are staggered, and the sensing lines respectively pass through the plurality of signal lines and the softness. The circuit board constitutes an electrical connection. The touch panel of claim 4, wherein the touch sensing layer comprises a plurality of sensing electrodes and a plurality of signal lines, and the plurality of signal lines are electrically connected to the flexible circuit board. The touch panel having the fingerprint recognition function according to any one of claims 1 to 5, wherein the non-visible area is located at a periphery of the visible area, and the non-visible area is coated with an ink layer. The touch panel having the fingerprint recognition function described in claim 6 is disposed at an adjacent position of the fingerprint recognition chip. The touch panel having the fingerprint recognition function according to claim 7, wherein the shape of the vertical sensing line and the horizontal sensing line of the sensing layer are respectively composed of a plurality of diamond electrodes connected in series. The touch panel with fingerprint identification function as claimed in claim 8, the capacitive fingerprint sensor refers to a strip fingerprint sensor.