TW202141247A - Touch and display device with fingerprint sensing function and touch sensing device - Google Patents

Abstract

A touch display device with a fingerprint sensing function and a touch sensing device, wherein the touch display device includes a first conductor layer, a second conductor layer and a display. The first conductor layer includes a touch sensor formed in a mesh pattern, and a plurality of receiving sensors for a fingerprint sensor. The second conductor layer is below the first conductor layer and includes a shielding area to shield the touch sensor and a plurality of driving sensors for the fingerprint sensor. The plurality of driving sensors is below the plurality of receiving sensors. The display is below the second conductor layer. The touch display device implements the fingerprint sensing function, while the second conductor layer shields the noise of the display to avoid noise interference to the first conductor layer.

Description

Touch display device with fingerprint sensing function and touch sensing device

The present invention is a touch display device, especially a touch display device integrated with a fingerprint sensing function.

Fingerprint sensing and touch control are common functions of current portable electronic devices (such as mobile phones). Capacitive fingerprint sensors and capacitive touch sensors are widely used. In response to the trend of full screens or high screen ratios, how to integrate capacitive touch sensors and capacitive fingerprint sensors with the display and reduce the interference of display noise has become an important issue .

The present invention provides a touch display device with fingerprint sensing function, which includes:

A first conductor layer, including a touch sensor formed in a grid pattern, and a plurality of receiving electrodes for a fingerprint sensor;

A second conductive layer is located below the first conductive layer. The second conductive layer includes a shielding area for shielding the touch sensor, and a plurality of driving electrodes for the fingerprint sensor, the plurality of driving The electrodes are located under the plurality of receiving electrodes, and the directions of the plurality of driving electrodes are different from the directions of the plurality of receiving electrodes; and;

A display part is located under the second conductor layer.

The invention integrates a capacitive touch sensor, a capacitive fingerprint sensor and a display, and can prevent the noise of the display from affecting the capacitive touch sensor.

The present invention provides a touch sensing device with fingerprint sensing function, which includes:

A first conductor layer, including a touch sensor formed in a grid pattern, and a plurality of receiving electrodes for a fingerprint sensor;

An insulating substrate located under the first conductive layer for supporting the first conductive layer; and

A second conductive layer is located under the insulating substrate. The second conductive layer includes a shielding area for shielding the touch sensor, and a plurality of driving electrodes for the fingerprint sensor, the plurality of driving electrodes It is located below the plurality of receiving electrodes, and the directions of the plurality of driving electrodes are different from the directions of the plurality of receiving electrodes.

The invention integrates a capacitive touch sensor and a capacitive fingerprint sensor, and can prevent external noise from affecting the capacitive touch sensor.

Please refer to FIGS. 1 and 2, the present invention provides a touch display device with fingerprint sensing function, including a display portion 10, a first conductive layer 20 and a second conductive layer 30. The first conductive layer 20 includes a touch sensor 21 formed in a grid pattern, and a plurality of receiving electrodes RX for a fingerprint sensor. The first conductive layer 20 also includes a wiring area 24 for forming a plurality of wirings. The multiple wires are used to connect the touch sensor 21 and the multiple receiving electrodes RX to transmit or receive signals. In one embodiment, an insulating substrate 23 is disposed under the first conductive layer 20, and the insulating substrate 23 is used to support the first conductive layer 20. The second conductive layer 30 is located under the first conductive layer 20. The second conductor layer 30 includes a shielding area 31 and a plurality of driving electrodes TX for the fingerprint sensor. The plurality of driving electrodes TX are located under the plurality of receiving electrodes RX. The direction of the plurality of driving electrodes TX is different from the direction of the plurality of receiving electrodes RX. In an embodiment, the plurality of driving electrodes TX and the plurality of receiving electrodes RX are perpendicular to each other. The second conductive layer 30 also includes a wiring area 32 for forming a plurality of wirings. The multiple wires are used to connect the multiple drive electrodes TX so as to receive drive signals from the touch integrated circuit or the fingerprint sensor integrated circuit. The display portion 10 is located under the second conductive layer 30, and the display portion 10 includes a visible area 11 and a non-visual area 12. The shielding area 31, the touch sensor 21, and the viewing area 11 overlap completely or partially in the z direction. The shielding area 31 is a piece of conductive material used to provide a shielding function for the touch sensor 21 to prevent the signal or noise from the display portion 10 from affecting the touch sensor 21. The touch sensor 21 is a capacitive touch sensor for sensing the operation of a conductive object (such as a finger). The plurality of driving electrodes TX and the plurality of receiving electrodes RX form a fingerprint sensor for sensing fingerprints. In one embodiment, the first conductive layer 20, the insulating substrate 23, and the second conductive layer 30 can constitute a touch sensing device with fingerprint sensing function.

An insulating layer 40 can be further provided between the second conductive layer 30 and the display portion 10 to prevent the display portion 10 from electrically contacting the second conductive layer 30.

A protective cover plate may be further provided above the first conductive layer 20. In one embodiment, the thickness of the protective cover plate is not greater than 300 microns.

In one embodiment, the second conductive layer 30 is a metal film, such as silver, with a thickness of no more than 10 nm, and a light transmittance can be greater than 90%. The shielding area 31 and the plurality of driving electrodes TX are made of the metal thin film.

In one embodiment, the display portion 10 is an organic light emitting diode (OLED) display, and has a visible area 11 and a non-visible area 12. The visible area 11 is used to display images, and the non-visual area 12 can be used to set electronic components. A plurality of regularly arranged pixel electrodes 111 as shown in FIG. 3 are arranged in the visible area 11. In one embodiment, the plurality of pixel electrodes 111 include a red pixel electrode (R), a green pixel electrode (G), and a blue pixel electrode. For the electrode (B), the arrangement of the pixel electrodes 111 can be in other forms and is not limited to what is shown in the figure. The display unit 10 further includes a light shielding unit 112. The light shielding portion 112 is a so-called Black Matrix (BM). In the z direction, the light shielding portion 112 and the pixel electrode 111 do not overlap. In an embodiment, the sizes of the first conductive layer 20 and the second conductive layer 30 and the display portion 10 are approximately the same.

The touch sensor 21 includes a first-axis touch electrode 211 and a plurality of second-axis touch electrodes 212 shown in FIG. 4A, each of the first-axis touch electrode 211 and the plurality of second-axis touch electrodes The touch electrodes 212 are insulated. In this embodiment, the first axial touch electrode 211 extends along the X direction, and the second axial touch electrode 212 extends along the Y direction. Each of the first-axis touch electrodes 211 and each of the second-axis touch electrodes 212 are electrically connected to a touch integrated circuit (not shown in the figure) through a wire 213. In this embodiment, the multiple receiving electrodes RX are arranged at the center of the bottom of the touch sensor 21, that is, at the center of the edge area of the touch sensor 21, so the first axis touch of the last one is The electrode 211A is divided into two sections. Two ends of the first axial touch electrode 211A are respectively electrically connected to the touch integrated circuit via a wire 213. In other embodiments, depending on the area occupied by the multiple receiving electrodes RX, there may be more than one first-axis touch electrode 211A divided into two sections. The two ends of the first axial touch electrode 211A divided into two sections are also electrically connected to the touch integrated circuit through the wiring 213 respectively.

The receiving electrode RX, the first axis touch electrode 211, and the second axis touch electrode 212 are all formed on the upper surface of the insulating substrate 23. In one embodiment, the first axis touch electrode 211, the second axis touch electrode 212 are formed on the upper surface of the insulating substrate 23. The axial touch electrode 212 has the same thickness as the receiving electrode RX. In other words, the multiple receiving electrodes RX and the touch sensor 21 are arranged on the same plane and are coplanar.

FIG. 4B provides an embodiment of the first-axis touch electrode 211 and the second-axis touch electrode 212. The intersection of a first-axis touch electrode 211 and a second-axis touch electrode 212 forms a sensing unit 214. Each of the first-axis touch electrodes 211 and each of the second-axis touch electrodes 212 is made of a metal mesh, which includes a grid pattern formed by a plurality of metal wires 215 staggered. In the z direction, the plurality of metal wires 215 will not overlap the pixel electrode 111. The plurality of metal wires 215 are arranged alternately to form a plurality of meshes, so that the pixel electrode 111 of the display portion 10 will not be shielded by the touch sensor 21. In other words, the plurality of metal wires 215 and the light shielding portion 112 of the display portion 10 are at Z The directions overlap at least partially.

Regarding the structure of the receiving electrode RX and the driving electrode TX of the fingerprint sensor, please refer to the schematic diagram of FIG. 5, where a plurality of receiving electrodes RX1 to RX3 extend along the X direction. The plurality of driving electrodes TX1 to TX3 are located under the plurality of receiving electrodes RX1 to RX3, and each driving electrode TX is represented by a strip-shaped block coated with fine dots and extends along the Y direction. Adjacent drive electrodes TX are spaced apart and not connected. Similar to the design of the first-axis touch electrode 211 and each of the second-axis touch electrodes 212, the plurality of receiving electrodes RX1 to RX3 are also grid patterns composed of a plurality of metal wires. Each receiving electrode RX is formed by horizontally connecting multiple diamond-shaped grid cells, but the shape of the grid cells is not limited to this. The different receiving electrodes RX are separated from each other without being electrically connected. The first conductor layer 20 further includes a wiring area 24, and the wiring area 24 has metal wires 215A to 215C for connecting the receiving electrodes RX1 to RX3 to transmit signals.

The touch display device according to the present invention can be executed in a touch sensing mode or a fingerprint sensing mode. In the touch sensing mode, the information sensed by the fingerprint sensor is provided to a touch integrated body The circuit calculates the touch coordinates of the object; in the fingerprint sensing mode, the information sensed by the fingerprint sensor is provided to a fingerprint sensing integrated circuit to generate a fingerprint image. The following describes the two modes separately.

1. Touch sensing mode:

In the touch sensing mode, the touch integrated circuit 25 shown in FIG. 6 performs mutual capacitance scanning on the touch sensor 21 (see FIG. 4A or FIG. 4B) to obtain first sensing information. During the mutual capacitance scanning process, the touch integrated circuit applies a driving signal to the second axis touch electrode 212 and senses the plurality of first axis touch electrodes 211. According to the result of the mutual capacitance scanning, the touch integrated circuit obtains the first sensing information of the touch sensor 21, and the first sensing information includes the sensing amount of each sensing unit 214. In this touch sensing mode, the driving electrodes TX and the receiving electrodes RX of the fingerprint sensor are electrically connected to the touch integrated circuit 25 for touch detection. Figure 6 provides a schematic diagram illustrating the configuration and operation of the fingerprint sensor in the touch sensing mode. As shown in Figure 6, TX1~TX9 are driving electrodes TX, and RX1~RX5 are receiving electrodes RX. A plurality of switches 121, 122, 124, and 125 are provided in the non-visual area 12, and a plurality of wires 123 and 126 connected to the touch integrated circuit 25. The switch 121 is used to select the receiving electrode RX, and the switch 122 is used to connect the receiving electrode RX to the touch integrated circuit 25 or the fingerprint sensing integrated circuit 50. The switch 124 is used to select the driving electrode TX, and the switch 126 is used to connect the driving electrode TX to the touch integrated circuit 25 or the fingerprint sensing integrated circuit 50. The switches 121, 122, 124, and 125 may be implemented by thin-film transistors (TFT). In one embodiment, in the touch sensing mode, the switches 121, 122, 124 and 125 are controlled by the touch integrated circuit 25. The receiving electrodes RX1, RX2, RX4, and RX5 are all electrically connected together, and connected to the touch integrated circuit 25 via a wire 126. In other embodiments, it is also possible to add a switch to connect the receiving electrode RX3 to the wire 126. In this way, all the receiving electrodes RX1 to RX5 of the fingerprint sensor are electrically connected together.

By scanning the fingerprint sensor, a second sensing information including at least one sensing quantity can be obtained. Taking mutual capacitive scanning as an example, when the fingerprint sensor is used for touch detection, a plurality of driving electrodes TX are divided into two groups with the same number, and the areas of the two groups of driving electrodes TX do not overlap. Taking FIG. 6 as an example, by controlling the switches 121 and 122, the driving electrodes TX1 to TX4 are electrically connected to form a first group of driving electrodes, and the driving electrodes TX6 to TX9 are electrically connected to form a second group of driving electrodes. The touch integrated circuit 25 first sends a driving signal to the driving electrode of the first group, and receives the first signal from the wire 126. Next, the touch integrated circuit 25 sends a driving signal to the driving electrode of the second group, and receives a second signal from the wire 126. According to the first signal and the second signal, the touch integrated circuit 25 can generate two sensing quantities. These two sensing quantities can be regarded as the sensing quantities of the two sensing units 214 lacking in the touch sensor 21 due to the area occupied by the multiple receiving electrodes RX in FIG. 4A.

The aforementioned first sensing information includes the sensing quantities of all the sensing units 214 of the touch sensor 21, and the aforementioned second sensing information includes one or more sensing quantities generated by the fingerprint sensor. According to the first sensing information and the second sensing information, the touch integrated circuit 25 can calculate the contact coordinates of the object.

It can be understood from the embodiment of FIG. 6 that in the touch sensing mode, multiple switches in the visible area 12 are controlled so that at least two receiving electrodes of the fingerprint sensor are electrically connected, and at least two driving electrodes are electrically connected. Connected so that the fingerprint sensor forms at least one sensing unit.

2. Fingerprint sensing mode:

In the fingerprint sensing mode, the driving electrodes TX and the receiving electrodes RX of the fingerprint sensor are electrically connected to the fingerprint sensing integrated circuit 50. In an embodiment of the fingerprint sensing mode, the fingerprint sensing integrated circuit 50 performs mutual capacitive scanning on the fingerprint sensor to obtain multiple sensing quantities at the intersection of all driving electrodes TX and receiving electrodes RX. In this mutual capacitance scanning, the fingerprint sensing integrated circuit 50 sequentially applies a driving signal to each driving electrode TX, and obtains a plurality of sensing quantities according to the output of the plurality of receiving electrodes RX. The fingerprint sensing integrated circuit 50 recognizes the user's fingerprint based on the obtained sensing quantities.

In another embodiment of the fingerprint sensing mode, two adjacent driving electrodes TX can be connected in parallel to apply a driving signal, and every two receiving electrodes RX can be connected in parallel to read its output. The advantage of this approach is that Obtain a larger sensing signal. As shown in the schematic diagrams of FIGS. 7A and 7B, the non-visual area 12 further includes a plurality of wires 127 and 128 connected to the fingerprint sensing integrated circuit 50. For simplicity, in FIGS. 7A and 7B, the touch integrated circuit 25 and the multiple wires 123 and 126 are omitted. The plurality of wires 123 and 126 may be made of the same layer of conductors, while the wires 127 and the wires 128 are made of another layer of conductors. In the fingerprint sensing mode, the fingerprint recognition integrated circuit 50 controls the switches 122 and 125 so that the driving electrodes TX1 to TX9 and the receiving electrodes RX1 to RX5 are electrically connected to the wires 127 and 128, respectively.

The first phase of the fingerprint sensing mode is shown in Figure 7A. By controlling the multiple switches 121 and 124, two adjacent driving electrodes (TX1, TX2), (TX3, TX4), (TX5, TX6), (TX7, TX8) are connected in parallel, and two adjacent receiving electrodes (RX1, TX8) are connected in parallel. RX2) is connected in parallel with (RX3, RX4). The fingerprint sensing integrated circuit 50 sequentially drives the four groups of driving electrodes and the two groups of receiving electrodes receive sensing signals. The second phase of the fingerprint sensing mode is shown in FIG. 7B. By controlling the multiple switches 121 and 124, two adjacent driving electrodes (TX2, TX3), (TX4, TX5), (TX6, TX7), (TX8, TX9) are connected in parallel, and two adjacent receiving electrodes (RX2, RX3) are connected in parallel with (RX4, RX5). The fingerprint sensing integrated circuit 50 sequentially drives the four groups of driving electrodes and the two groups of receiving electrodes receive sensing signals. According to the sensing signals obtained in the first time phase and the second time phase, the fingerprint sensing integrated circuit 50 can generate a fingerprint image for fingerprint identification or registration.

Compared with the method of driving one driving electrode TX and receiving signals from one receiving electrode RX at a time, the embodiments of FIG. 7A and FIG. 7B have the advantage of obtaining a larger sensing signal, and can improve the sensitivity of fingerprint sensing.

In one embodiment, the touch integrated circuit 25 of FIG. 7A and the fingerprint sensing integrated circuit 50 of FIG. 7B are two separate integrated circuit devices mounted on a flexible circuit board connected to the non-visual area 12 . In other embodiments, the touch integrated circuit 25 and the fingerprint sensing integrated circuit 50 can also be integrated into a single integrated circuit device.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art without departing from the spirit and scope of the present invention may make various changes and modifications relative to the above-mentioned embodiments. The technical scope of the invention is protected. Therefore, the scope of protection of the invention shall be subject to the scope of the attached patent application.

10: Display 11: Viewing area 12: Non-visual area 121, 122, 124, 125: switch 123, 126, 127, 128: wire 111: pixel electrode 112: Light shielding part 20: The first conductor layer 21: Touch sensor 211, 211A: first axis touch electrode 212: second axis touch electrode 213: routing 214: Induction unit 215,215A~215C: Metal wire 23: Insulating base material 24: Wiring area 25: Touch integrated circuit 30: second conductor layer 31: shielded area 32: Wiring area 40: Insulation layer 50: Fingerprint sensing integrated circuit RX, RX1~RX5: receiving electrode TX, TX1~TX9: drive electrodes

Figure 1: A schematic diagram of the structure of an embodiment of the present invention. FIG. 2 is a schematic diagram of the first conductor layer, the second conductor layer and the display part according to an embodiment of the present invention. Figure 3: Schematic diagram of the pixel electrode arrangement of the display part. FIG. 4A is a schematic diagram of the structure of a touch sensor according to an embodiment of the present invention. 4B: A partial enlarged schematic diagram of the first touch electrode and the second touch electrode of the touch sensor according to the present invention. Fig. 5: A partial schematic diagram of the receiving electrode and the driving electrode of the fingerprint sensor according to the present invention. Fig. 6: A schematic diagram of the connection of the fingerprint sensor of the present invention in the touch sensing mode. Figures 7A and 7B: schematic diagrams of the connection of the fingerprint sensor of the present invention in the fingerprint sensing mode.

10: Display

11: Viewing area

12: Non-visual area

121, 122: switch

20: The first conductor layer

21: Touch sensor

24: Wiring area

30: second conductor layer

31: shielded area

32: Wiring area

RX: receiving electrode

TX: drive electrode

Claims (13)

A touch display device with fingerprint sensing function, including: A first conductor layer, including a touch sensor formed in a grid pattern, and a plurality of receiving electrodes for a fingerprint sensor; A second conductive layer is located below the first conductive layer. The second conductive layer includes a shielding area for shielding the touch sensor, and a plurality of driving electrodes for the fingerprint sensor, the plurality of driving The electrodes are located under the plurality of receiving electrodes, and the directions of the plurality of driving electrodes are different from the directions of the plurality of receiving electrodes; and A display part is located under the second conductor layer. The touch display device with fingerprint sensing function according to claim 1, wherein the thickness of the second conductive layer is less than 10 nanometers. The touch display device with fingerprint sensing function according to claim 1, wherein the touch sensor includes a plurality of first-axis touch electrodes and a plurality of second-axis touch electrodes, and the plurality of first axes The touch electrodes are insulated from the plurality of second-axis touch electrodes, and the plurality of receiving electrodes are located at the edge of the touch sensor, so that at least one of the first-axis touch electrodes is divided into two sections, the Two ends of at least one first axial touch electrode are electrically connected to a touch integrated circuit. According to claim 3, the touch display device with fingerprint sensing function, the display portion includes a plurality of pixel electrodes for displaying images; each of the first-axis touch electrodes and each of the second-axis touch electrodes are respectively It is composed of a plurality of metal wires arranged in a staggered arrangement, and the plurality of metal wires are arranged in a staggered arrangement to form a mesh so that the plurality of pixel electrodes of the display part will not be shielded by the touch sensor. The touch display device with fingerprint sensing function according to claim 1, wherein in a touch sensing mode, the touch integrated circuit senses the touch sensor to obtain a first sensing information, and The fingerprint sensor is sensed to obtain second sensing information, and the touch integrated circuit calculates a touch coordinate of an object according to the first sensing information and the second sensing information. For the touch display device with fingerprint sensing function according to claim 1, the display portion includes a visible area and a non-visible area. A plurality of pixel electrodes are arranged in the visible area for displaying images, and the non-visible area is arranged A plurality of switches are respectively coupled to the plurality of receiving electrodes and the plurality of driving electrodes of the fingerprint sensor. The touch display device with fingerprint sensing function according to claim 6, wherein in the touch sensing mode, the plurality of switches are controlled to electrically connect at least two receiving electrodes of the fingerprint sensor, and At least two driving electrodes are electrically connected, so that the fingerprint sensor forms at least one sensing unit. For the touch display device with fingerprint sensing function of claim 6, when the fingerprint sensor executes a fingerprint sensing mode, the switches are controlled to electrically connect two adjacent receiving electrodes, Two adjacent driving electrodes are electrically connected. A touch sensing device with fingerprint sensing function includes: A first conductor layer, including a touch sensor formed in a grid pattern, and a plurality of receiving electrodes for a fingerprint sensor; An insulating substrate located under the first conductive layer for supporting the first conductive layer; and A second conductive layer is located under the insulating substrate. The second conductive layer includes a shielding area for shielding the touch sensor, and a plurality of driving electrodes for the fingerprint sensor, the plurality of driving electrodes It is located below the plurality of receiving electrodes, and the directions of the plurality of driving electrodes are different from the directions of the plurality of receiving electrodes. The touch sensing device with fingerprint sensing function according to claim 9, wherein the thickness of the second conductive layer is less than 10 nanometers. The touch sensing device with fingerprint sensing function according to claim 9, wherein the touch sensor includes a plurality of first-axis touch electrodes and a plurality of second-axis touch electrodes, the first The axial touch electrodes are insulated from the plurality of second axial touch electrodes, and the plurality of receiving electrodes are located at the edge of the touch sensor, so that at least one of the first axial touch electrodes is divided into two sections, Both ends of the at least one first axial touch electrode are electrically connected to a touch integrated circuit. According to the touch sensing device with fingerprint sensing function in claim 11, each of the first axis touch electrodes and each of the second axis touch electrodes are respectively formed by a plurality of metal wires arranged in a staggered manner. The touch sensing device with fingerprint sensing function according to claim 9, wherein in a touch sensing mode, the touch integrated circuit senses the touch sensor to obtain a first sensing information, And sensing the fingerprint sensor to obtain second sensing information, and the touch integrated circuit calculates a touch coordinate of an object according to the first sensing information and the second sensing information.

Images