TW202018581A - Fingerprint identification module and fingerprint identification touch display using the same - Google Patents

Abstract

A fingerprint identification module disclosed in a touch display area is provided. The fingerprint identification module includes a fingerprint sensor, a data input circuit, and a multiplexer array. The fingerprint sensor includes a plurality of fingerprint sensing electrodes, and the fingerprint sensing electrodes are divided into N groups, and each group has Mx Y fingerprint sensing electrodes. The data input circuit comprises N sets and each set having M electrode wires and M data lines. Each of the N sets of the M electrode wires is electrically connected to the corresponding Y fingerprint sensing electrodes of each of M columns in each group independently, and each of N sets of the M electrode wires is electrically connected to the corresponding M data lines respectively. The multiplexer array includes N switching circuits corresponding to the N sets of electrode wires. One of the N switching circuits independently receives a turning-on signal for turning on the set of electrode wires corresponding to the one of N switching circuits.

Description

Fingerprint identification module and fingerprint identification touch display using the same

The invention relates to an identification module, and in particular to a fingerprint identification module and a fingerprint identification touch display using the same.

Generally speaking, the touch display panel and fingerprint recognition module of a smart phone are independent modules and are manufactured separately, and then assembled together. Therefore, it is usually necessary to press a fingerprint on a specific fingerprint recognition area to realize fingerprint recognition, such as the home button of an Apple mobile phone. In addition, such a front-end fingerprint recognition module usually compresses the screen display area and reduces the screen ratio.

As various mobile phone manufacturers continue to develop high screen-to-body ratios on the screen, how to perform fingerprint recognition within the full-screen range to improve the integrity of the display device and the screen-to-body ratio is an issue that the industry urgently needs to solve.

The present invention relates to a fingerprint recognition module and a fingerprint recognition touch display using the same, which can recognize fingerprints in the touch display area without the need to additionally provide a single-point fixed-position fingerprint sensor to improve the overall display device Sex and screen ratio.

According to one aspect of the present invention, a fingerprint identification module is provided, which is disposed in a touch display area. The fingerprint identification module includes a fingerprint sensor, a data input circuit and a multiplexer array. The fingerprint sensor includes a plurality of fingerprint sensing electrodes. The fingerprint sensing electrodes are divided into N groups, and each group has MхY fingerprint sensing electrodes. The data input circuit includes N groups of M electrode wires and M data wires in each group, wherein the M electrode wires of each group are independently electrically connected to the Y fingerprint sensing electrodes in each row of the corresponding M rows, and the M in each group The electrode leads are electrically connected to the corresponding M data lines, respectively. The multiplexer array includes N switch circuits, corresponding to N sets of electrode wires, one of the N switch circuits independently receives a communication signal to connect the set of electrode wires corresponding to the switch circuit, wherein N , M, Y are positive integers greater than 1.

According to one aspect of the present invention, a fingerprint recognition touch display is provided, which includes a touch display panel, a controller, and the above-mentioned fingerprint recognition module. The touch display panel has a touch display area. The controller is connected to the touch display panel. The fingerprint identification module is set in the touch display area.

In order to have a better understanding of the above and other aspects of the present invention, the following examples are specifically described in conjunction with the accompanying drawings as follows:

The following is an example for detailed description. The example is only used as an example, not intended to limit the scope of the present invention. The following description uses the same/similar symbols to indicate the same/similar components. Directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions referring to the drawings. Therefore, the directional terminology is used to illustrate rather than limit the invention.

According to an embodiment of the present invention, a fingerprint recognition module capable of recognizing fingerprints at any position within the touch display area is proposed to achieve full-screen fingerprint recognition. The fingerprint identification module of this embodiment may use an optical sensing method. When a finger touches any position on the touch display panel (such as the fingerprint position shown in FIG. 1), the finger is reflected by the backlight to the fingerprint sensing The fingerprint information can be obtained by different reflectivity of the pattern peaks and valleys to know the position where the finger touches. When the touch display panel is in fingerprint recognition mode, the controller (such as a fingerprint recognition controller) can drive the fingerprint sensor electrodes in the fingerprint recognition module by partitions, so that the fingerprint sensor electrodes can sense finger fingerprints in the fingerprint recognition mode. The fingerprint sensor signal is sent back to the controller for fingerprint identification. In addition, when the touch display panel is in the touch-sensing mode, the fingerprint recognition module can be turned off, which only allows the detection of the touch position of the finger, but does not perform the fingerprint recognition function. In one embodiment, the fingerprint identification module and the touch display panel can be made independently, or the fingerprint identification module and the touch display panel can be made integrally, and then assembled on the handheld electronic device (as shown in FIG. 1) The full screen smartphone), the present invention does not limit this.

Referring to FIGS. 1 and 2, according to an embodiment of the present invention, the fingerprint recognition touch display 100 includes a touch display panel 110, a controller 120, and a fingerprint recognition module 130. The touch display panel 110 has a touch display area 112, such as a full-screen (screen ratio greater than 80% or 90%) display screen or a display screen with a relatively small screen ratio (eg, less than 80%). Be restricted. The controller 120 is connected to the touch display panel 110 to drive the fingerprint recognition module 130. The fingerprint identification module 130 is disposed in the touch display area 112 for sensing and identifying fingerprints.

In one embodiment, the touch display panel 110 is used to detect a fingerprint touch position 116 located in the touch display area 112, and the controller 120 can generate a corresponding communication number according to the fingerprint touch position 116 (ie Pulse signal SP) to drive the fingerprint identification module 130. In addition, the controller 120 can drive the fingerprint sensing electrodes 132 in the fingerprint recognition module 130 by partitions, so that the fingerprint sensing electrodes 132 in the corresponding area can sense finger fingerprints in the fingerprint recognition mode. The fingerprint identification module 130 can return the fingerprint sensing signal to the controller 120 for fingerprint identification.

Referring to FIGS. 2 and 3, in one embodiment, the fingerprint identification module 130 includes a fingerprint sensor 131, a data input circuit 133, and a multiplexer array 141. The fingerprint sensor 131 includes a plurality of fingerprint sensor electrodes 132. In order to drive the fingerprint sensor 131 in a partitioned manner, the fingerprint sensor electrodes 132 are divided into N groups, and each group has M Y fingerprint sensor electrodes 132. Please also refer to FIG. 3, the fingerprint sensing electrodes 132 are divided into 6 groups (N=6) in the short side direction of the fuselage, and each group has, for example, 180х1920 (M=180, Y=1920) fingerprint sensing electrodes 132, However, the number of groups and the number of electrodes in each group are not limited. With respect to each group of MхY fingerprint sensing electrodes 132, the data input circuit 133 is provided with N groups of M electrode leads 134 in each group, which are electrically connected to the Y fingerprint sensing electrodes 132 in M rows and each row of the corresponding group independently. In addition, with respect to each group of M electrode leads 134 in the N group, the data input circuit 133 is provided with M data lines 135 that are electrically connected to the M electrode leads 134 in each group.

Therefore, in FIGS. 3 and 4, the data input circuit 133 is formed with NxM electrode leads 134 and M data lines 135 arranged in cross in the wiring area 114. The first electrode lead 134 in each group is electrically connected to the first data line 135 (Pin_1), the second electrode lead 134 in each group is electrically connected to the second data line 135 (Pin_2), ..., each group The M-th electrode wire 134 in FIG. 3 is electrically connected to the M-th data line 135 (Pin_M), and is sequentially arranged below the touch display area 112.

In addition, in order to achieve the partition-driven fingerprint sensor 131, the multiplexer array 141 includes N switch circuits 142 corresponding to N sets of electrode wires 134. In other words, the first switch circuit 142 (MUX1) can be connected to or disconnected from the M electrode leads 134 in the first group, and the second switch circuit 142 (MUX2) can be connected to the M electrode leads 134 in the second group On or off, ..., the Nth switching circuit 142 (MUXN) can be turned on or off with the M electrode leads 134 in the Nth group. Referring to FIGS. 3 and 5, at the same time, only one switch circuit 142 is connected to the corresponding set of M electrode leads 134, and the remaining N-1 switch circuits 142 are in the off state. Therefore, in FIG. 3, only one of the N switching circuits 142 receives a communication signal (ie, a pulse signal SP) independently to connect a group of electrode wires 134 corresponding to the switching circuit 142 , The remaining N-1 switch circuits 142 are in the off state.

In addition, when a switch circuit 142 in the multiplexer array 141 receives a communication signal, the M data lines 135 can be turned on to receive the fingerprint sensing signal from one of the M sets of electrode wires 134. Please refer to FIG. 5, when the second switch circuit 142 (MUX2) receives a communication signal, the pulse signal SP of the second switch circuit 142 (MUX2) is at a high level, and the remaining N-1 switch circuits 142 are at The low level and the pulse signals SP of the M data lines 135 are also at a high level for obtaining the sensing signal of the optical sensor 131 of the fingerprint sensor. The communication signal is, for example, a charging signal indicating that the electrodes of the fingerprint sensor 131 are charged, and the charging signal corresponds to a charging pulse time. The charging pulse time may be less than or equal to one column scan time T_line. Since the multiplexer array 141 of the present invention does not cause the problem of delay between elements due to switching on/off, the charging time of the fingerprint sensor 131 can be greatly increased. In this embodiment, the screen update rate is calculated at 60 Hz. The frame display time is approximately 16.67 ms, and the column scan time T_line is approximately 8.68 µs/each column (a total of 1920 columns), so the charging pulse time can reach 8.68 µs.

Next, referring to FIGS. 6A and 6B, the charging time of the fingerprint sensor 131 is not limited to one column scan time T_line, and may be less than one column scan time T_line. In FIG. 6A, the second switching circuit 142 (MUX2) is turned on and the charging pulse time is approximately equal to a column scan time T_line, while in FIG. 6B, the second switching circuit 142 is turned on and the charging pulse of the pulse signal SP1 The time is approximately equal to the half-column scanning time T_line. After that, the second switch circuit 142 is turned off, the third switch circuit 142 is turned on, and the charging pulse time of the pulse signal SP2 is approximately equal to the half-column scanning time T_line. In other words, the electrodes of the fingerprint sensor 131 in the two partitions can be charged in a time-sharing manner within a scan time T_line. In this embodiment, the screen update rate is calculated at 60 Hz, and the column scan time T_line is approximately 8.68 µs/each column, so the charging pulse time can reach 4.34 µs. The above charging pulse time is only an example, and the present invention does not limit it.

Please refer to FIG. 3, in this embodiment, the multiplexer array 141 is divided into 6 groups, so the number of multiplexers can be reduced, and the controller 120 only needs 6 signal lines 136 and 6 groups of multiplexers. The switch circuit 142 is electrically connected to reduce the wiring area of the signal line 136. In addition, in this embodiment, the controller 120 only needs 180 data lines 135 to receive the fingerprint sensing signal, so the wiring area of the data lines 135 can be reduced. In this embodiment, when the wiring area of the signal line 136 and the data line 135 is reduced, the width D (see FIG. 1) of the wiring area 114 below the touch display area 112 can be greatly reduced, for example, from 4000µm to 3000µm. In order to reduce the size of the fingerprint recognition module 130 and the overall size of the fingerprint recognition module 130 and the touch display panel 110 after assembly.

In addition, in this embodiment, the communication number can be provided by the touch display panel 110 directly determining the fingerprint touch position 116, or the controller 120 can sequentially scan the multiplexer array 141. When a touch event occurs, Sending a communication signal to a switch circuit 142 in the multiplexer array 141.

The fingerprint identification module and the fingerprint identification touch display disclosed in the above embodiments of the present invention can identify fingerprints at any position within the touch display area, and there is no need to additionally provide a single-point fixed position fingerprint sensor. Therefore, the appearance is not limited, the integrity of the display device can be improved, and the market demand for a high screen ratio can be achieved.

In summary, although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be deemed as defined by the scope of the attached patent application.

100: Fingerprint recognition touch display 110: Touch display panel 112: Touch display area 116: Fingerprint touch position 120: Controller 130: Fingerprint recognition module 131: Fingerprint sensor 132: Fingerprint sensor electrode 133: Data input Circuit 134: electrode lead 135: data line 136: signal line 141: multiplexer array 142: switch circuit Pin_1: first data line Pin_2: second data line Pin_M: Mth data line MUX1: first switch circuit MUX2: Second switching circuit MUXN: Nth switching circuit SP: pulse signal T_line: column scan time D: width N, M, Y: number

FIG. 1 is a schematic diagram of a fingerprint recognition touch display according to an embodiment of the invention. FIG. 2 is a schematic diagram of a fingerprint identification module according to an embodiment of the invention. FIG. 3 is an enlarged schematic view of the wiring area under the fingerprint identification module in FIG. 2. FIG. 4 shows a schematic diagram of dividing the fingerprint sensing electrodes into 6 groups with 180 fingerprint sensing electrodes in each group. FIG. 5 shows a schematic diagram of the pulse signals of the six switching circuits of the multiplexer array and the pulse signals received by the respective data lines. 6A and 6B are schematic diagrams respectively showing the pulse signals of the six switching circuits of the multiplexer array according to the second embodiment of the invention.

120: controller

133: data input circuit

134: electrode lead

135: Data cable

136: Signal cable

141: Multiplexer array

142: Switch circuit

Pin_1: the first data cable

Pin_2: the second data cable

Pin_M: Article M data line

MUX1: the first switching circuit

MUX2: second switching circuit

MUXN: Nth switch circuit

N, M: quantity

Claims (14)

A fingerprint recognition module is arranged in a touch display area. The fingerprint recognition module includes: a fingerprint sensor, including a plurality of fingerprint sensing electrodes, the plurality of fingerprint sensing electrodes are divided into N groups, each group has MхY fingerprint sensing electrodes; a data input circuit, including N groups of M electrode wires and M data wires in each group, in which each group of M electrode wires independently corresponds to the Y fingerprint sensor electrodes in each row of the M rows in each group Electrically connected, and the M electrode wires in each group are electrically connected to the corresponding M data wires; and a multiplexer array including N switching circuits corresponding to the N groups of electrode wires, wherein One of the N switching circuits independently receives a communication signal for connecting the set of electrode wires corresponding to the switching circuit, where N, M, and Y are positive integers greater than 1. The fingerprint identification module as described in item 1 of the patent application scope, wherein the communication signal is an electrode charging signal. The fingerprint identification module as described in item 2 of the patent application range, wherein the electrode charging signal corresponds to a charging pulse time. The fingerprint identification module as described in item 3 of the patent application range, wherein the charging pulse time is less than or equal to a row of scanning time. The fingerprint identification module as described in item 3 of the patent application, wherein the charging pulse time is less than or equal to the half-row scanning time. The fingerprint identification module as described in item 1 of the patent application scope further includes a controller for receiving a fingerprint sensing signal identified by the fingerprint sensor. According to the fingerprint identification module described in item 6 of the patent application scope, wherein the controller is connected to a touch display panel, the touch display panel is used to detect a touch position of a fingerprint located in the touch display area, the The controller correspondingly generates the connected communication number to the multiplexer array according to the touch position of the fingerprint. A fingerprint recognition touch display, comprising: a touch display panel with a touch display area; a controller connected to the touch display panel; and a fingerprint as described in one of items 1 to 5 of the patent application The identification module is arranged in the touch display area. The fingerprint identification touch display as described in item 8 of the patent scope, wherein the touch display panel is used to detect a touch position of a fingerprint located in the touch display area, and the controller corresponds to the touch position of the fingerprint Generate the communication signal to the multiplexer array. The fingerprint identification touch display as described in item 8 of the patent application scope, wherein the controller is used to receive a fingerprint sensing signal identified by the fingerprint sensor. The fingerprint identification touch display as described in item 8 of the patent application scope, wherein the communication signal is an electrode charging signal. The fingerprint identification touch display as described in item 11 of the patent application range, wherein the electrode charging signal corresponds to a charging pulse time. The fingerprint identification touch display as described in item 12 of the patent application range, wherein the charging pulse time is less than or equal to a row of scanning time. The fingerprint identification touch display as described in item 12 of the patent application range, wherein the charging pulse time is less than or equal to half the row scan time.

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