TWI704479B - Touch display panel - Google Patents

Abstract

A touch display panel includes a first sensing matrix and a second sensing matrix. The first sensing matrix includes a plurality of grid units and a first switch unit. The grid units are arranged in matrix, wherein each grid unit includes at least one first electrode. The first switch unit includes a plurality of first switches, and the first switches are disposed between adjacent grid units. Wherein, the control end of the first switches is configured to receive a first controlling signal, and one end of each first switch is configured to output a sensing signal. The second sensing matrix includes at least one second electrode, and is configured to receive a common signal. The second sensing matrix includes a plurality of opening units, and each opening unit overlaps with the open area of each pixel circuit in a vertical projection direction of the first substrate.

Description

Touch display panel

This disclosure relates to a touch display panel, especially a touch display panel that combines fingerprint recognition, pressure sensing and touch electrodes.

With the rapid development of touch display technology, touch display panels have been commonly used in smart devices (smart phones, tablets, notebook computers). Today's smart devices usually have a fingerprint recognition area, allowing users to use their fingerprints as a password to unlock the smart devices. Furthermore, as the force touch technology matures, current display panels will also have a pressure touch function. Therefore, if the touch display panel can be combined with the functions of fingerprint detection and pressure sensing, the functions of fingerprint recognition and pressure sensing can be provided to users without affecting the display area.

A touch display panel has a display area and a peripheral area adjacent to the display area, and includes a first sensing matrix and a second sensing matrix. The first sensing matrix is disposed on one side of the first substrate and the display area, and includes a plurality of grid units and first switch units. The plurality of grid units are arranged in a matrix form, wherein each grid unit includes at least one first switch unit. electrode. The first switch unit includes a plurality of first switches arranged between adjacent grid units, wherein the control terminal of the first switch is used to receive the first control signal, and one end of each first switch is used to output sensing Signal, the other end of each first switch is electrically connected to one of the grid cells. The second sensing matrix is arranged on one side of the first substrate and the display area. The second sensing matrix has at least one second electrode and is used for receiving a common signal. The second sensing matrix includes a plurality of opening units, and each opening unit overlaps the opening area of each pixel in the vertical projection direction of the first substrate.

A touch display panel has a display area and a peripheral area adjacent to the display area, and includes a first sensing matrix and a second sensing matrix. The first sensing matrix is disposed on one side of the first substrate and the display area, and includes a plurality of first data lines, a plurality of first gate lines, and a plurality of first cells. The plurality of first units have a plurality of first switches and a plurality of first electrodes. The first switches have a first control terminal, a first terminal, and a second terminal. The first control terminal of each first switch is electrically connected to the One of the data lines, the first terminal of each first switch is electrically connected to one of the first gate lines, and the second terminal of each first switch is electrically connected to one of the first electrodes One. The second sensing matrix is arranged on one side of the first substrate and the display area. The second sensing matrix has at least one second electrode and is used for receiving a common signal. The second sensing matrix includes a plurality of opening units, and each opening unit overlaps the opening area of each pixel in the vertical projection direction of the first substrate.

A touch display panel has a display area and a peripheral area adjacent to the display area, and includes a first electrode layer and a second electrode layer. The first electrode layer is disposed on one side of the first substrate and the display area, and includes a grid unit and a first switch unit. The grid unit includes a first electrode, one end of the first switch unit is electrically connected to the sensing data signal line, and the other end of the first switch unit is electrically connected to the grid unit. The second electrode layer is disposed on one side of the first substrate and the display area, and is used to receive a common signal, and includes a second electrode and an opening unit. The opening unit overlaps with the opening area of the pixel in the vertical projection direction of the first substrate.

The touch display panel of the present disclosure mainly uses the second sensing matrix to shield the signal of the first electrode to prevent the signal of the first electrode from interfering with the pixel circuit, and during the sensing period of the third electrode, the first electrode The second sensing matrix is kept in a floating state to reduce the influence of the first electrode on the third electrode. Furthermore, when the touch pressure is changed, the cell gap between the second sensing matrix and the third electrode will change, resulting in a change in the capacitance value, thereby achieving the effect of force touch. .

100: Touch display panel

110, 120: substrate

130: pixel array layer

140: touch sensing matrix

150: display medium

160: color filter layer

170: The first sensing matrix

180: second sensing matrix

210: control circuit

141: Touch electrode

142: touch common electrode

171: Grid Unit

1711: sensing unit

1712, 1721, T1, 1722, T2, 172A, 172P, 1831, 1832, 183A, 183P: switch

1713: sensing electrode

172, 183: switch unit

181: Common electrode

182: Opening unit

A1, A2, A3: area

AA: Display area

PA: Surrounding area

SDL: Sensing data line

SGL: sense gate line

CTL1, CTL2: control signal

SenS, SenS(1)~SenS(m): Sensing signal

EN, EN(1)~EN(n): enable signal

COM: common signal

DS, DS1, DS2: drive signal

AA’, BB’, CC’: cut line

W1, W2: Wire

L1: insulating layer

H1, H2: Through hole

G(n): Gate drive signal

DS1, DS2: drive signal

V1, V2, VH, VC, VGH, VGL: level

TP1: Display stage

TP2: Touch detection stage

TP3: Fingerprint detection stage

In order to make the above and other objectives, features, advantages and embodiments of the disclosure document more comprehensible, the description of the accompanying drawings is as follows: Figure 1 is a schematic structural diagram of a touch display panel according to an embodiment of the disclosure; Fig. 2A is a schematic diagram of a first sensing matrix according to an embodiment of the present disclosure; Fig. 2B is a schematic diagram of a partial enlargement of area A1 in Fig. 2A; Fig. 2C is a schematic diagram of another embodiment according to the present disclosure A schematic diagram of a sensing matrix; FIG. 2E is a schematic diagram of the first sensing matrix according to another embodiment of the present disclosure; FIG. 3A is a schematic diagram of a second sensing matrix according to an embodiment of the present disclosure; FIG. 3B is a schematic diagram of a second sensing matrix according to another embodiment of the present disclosure; FIG. 3C is a schematic diagram of another according to the present disclosure A schematic diagram of a second sensing matrix according to an embodiment; FIG. 4A is a schematic diagram of a second sensing matrix according to another embodiment of the present disclosure; FIG. 4B is a schematic diagram of a partial enlargement of area A2 in FIG. 4A; 4C is a schematic diagram of a second sensing matrix according to another embodiment of this disclosure; FIG. 4D is a schematic diagram of a second sensing matrix according to another embodiment of this disclosure; FIG. 4E is a schematic diagram of another according to this disclosure A schematic diagram of a second sensing matrix according to an embodiment; FIG. 5A is a schematic diagram of a touch sensing matrix according to an embodiment of the present disclosure; FIG. 5B is a schematic diagram of a touch sensing matrix according to an embodiment of the present disclosure Schematic diagram; FIG. 6A is a simplified cross-sectional schematic diagram along the section line AA' in FIG. 2A, FIG. 3C and FIG. 5B according to an embodiment of the disclosure; FIG. 6B is a simplified cross-sectional view taken along line AA' in FIG. 2A, FIG. 3C, and FIG. 5A according to an embodiment of the present disclosure; FIG. 6C is a diagram along the line according to an embodiment of the present disclosure 2A, 4A, and 5B, a simplified cross-sectional schematic view of the section line BB' in FIG. 5B; FIG. 6D is a cross-sectional view along the line in FIG. 2A, FIG. 4A, and FIG. 5B according to an embodiment of the present disclosure CC' is a simplified cross-sectional schematic diagram; FIG. 6E is a schematic diagram of a cross-section of the wire in area D in FIG. 4C; FIG. 6F is along FIG. 2A, FIG. 4A, and FIG. 5A according to an embodiment of the present disclosure A simplified cross-sectional schematic diagram of the middle section line BB'; FIG. 6G is a simplified cross-sectional diagram along the section line CC' in FIG. 2A, FIG. 4A, and FIG. 5A according to an embodiment of the present disclosure; FIG. 7A Fig. 7B is a timing diagram of a touch display panel according to another embodiment of the present disclosure; Fig. 7C is a timing diagram of a touch display panel according to another embodiment of the present disclosure; Fig. 7C is another embodiment of the touch display panel according to the present disclosure FIG. 7D is a timing diagram of a touch display panel according to another embodiment of this disclosure; and FIG. 8 is a timing diagram of a first sensing matrix according to another embodiment of this disclosure Schematic.

The embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals indicate the same or similar elements or method flows.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a touch display panel 100 according to an embodiment of the present disclosure. As shown in Figure 1, the touch display panel 100 includes substrates 110 and 120, a pixel array layer 130, a touch sensing matrix 140, a display medium 150, a color filter layer 160, a first sensing matrix 170, and a second Sense matrix 180. Wherein, the substrates 110 and 120 may be a combination of polarizers and glass substrates, the display medium 150 may be implemented as liquid crystal, the touch sensing matrix 140 may be implemented as an electrode layer composed of touch sensors, and the first sensing matrix 170 may be Implemented as an electrode layer composed of a fingerprint sensor (FPS), the second sensing matrix 180 can be implemented as a common electrode layer of the fingerprint sensor.

In one embodiment, as shown in Figure 1, the touch sensing matrix 140 is disposed on the upper surface of the substrate 110, and the first sensing matrix 170 and the second sensing matrix 180 are disposed on the lower surface of the substrate 120. The second sensing matrix 180 is located between the first sensing matrix 170 and the touch sensing matrix 140, and the substrate 110 and the substrate 120 are disposed oppositely. Next, the pixel array layer 130 is disposed on the upper surface of the substrate 110 and is disposed between the substrate 110 and the touch sensing matrix 140, and the touch sensing matrix 140 is one layer of the pixel array layer 130. The color filter layer 160 is disposed on the lower surface of the substrate 120 and is located between the display medium 150 and the second sensing matrix 180, and the display medium 150 is disposed between the substrate 110 and the substrate 120.

Please refer to FIG. 2A. FIG. 2A is a schematic diagram of the first sensing matrix 170 according to an embodiment of the present disclosure. As shown in FIG. 2A, the first sensing matrix 170 includes a plurality of grid units 171 and switch units 172 (not shown in FIG. 2A), the grid unit 171 includes a plurality of sensing units 1711 (not shown in FIG. 2A), and the grid units 171 are arranged in a matrix. The first sensing matrix 170 is used to receive the control signal CTL1 and the enable signal EN(n) from the control circuit 210, and is used to transmit the sensing signal SenS(m) to the control circuit 210.

Please refer to Figure 2B. Figure 2B is an enlarged schematic diagram of a portion of area A1 in Figure 2A. In the embodiment shown in FIG. 2B, the grid unit 171 includes four sensing units 1711, and the disclosure is not limited thereto. In another embodiment, the grid unit 171 may include 60×66 sensing units 1711. Among them, the size of the sensing unit 1711 is substantially the same as the pixel unit. As shown in FIG. 2B, the sensing unit 1711 includes a switch 1712 and a sensing electrode 1713. The first terminal of the switch 1712 is electrically connected to the sensing data line SDL, the second terminal of the switch 1712 is electrically connected to the sensing electrode 1713, and the control terminal of the switch 1712 is electrically connected to the sensing gate line SGL.

In accordance with the foregoing, in the embodiment shown in FIG. 2B, four sensing gate lines SGL and four sensing data lines SDL are taken as an example. For example, the first sensing gate line SGL is used to transmit the enable signal EN(1) to turn on the switch 1712, and the first sensing data line SDL is used to transmit the sensing signal SenS(1) to the control circuit 210 , Other sensing gate lines SGL and sensing data lines SDL have similar operations, which will not be repeated here. It can be seen from the above example that the first sensing matrix 170 has 1~n sensing gate lines SGL for respectively transmitting enable signals EN(1)~EN(n), and 1~m sensing data lines SDL is used to respectively transmit the sensing signals SenS(1)~SenS(m).

In view of the above, for the sake of brevity, if we use When a component number or device number is used without specifying the index of the component number or device number, it means that the component number or device number refers to any unspecified component or device in the component group or device group. For example, the component number EN refers to any of the enable signals EN(1)~EN(n), and the component number SenS refers to the sensing signals SenS(1)~SenS(m) Any sensing signal of.

In view of the above, the switch unit 172 includes a plurality of first switches 1721 and a plurality of second switches 1722. As shown in FIG. 2B, the grid unit 171 includes 12 first switches 1721 and 12 second switches 1722. Taking one of the plurality of first switches 1721 as an example, the first terminal and the second terminal of the switch T1 are electrically connected between two adjacent grid units 171, and the first terminal and the second terminal of the switch T1 It is electrically connected to the sensing gate line SGL, and the control terminal of the switch T1 is used to receive the control signal CTL1 from the control circuit 210.

In view of the above, taking one of the plurality of second switches 1722 as an example, the first end and the second end of the switch T2 are electrically connected between two adjacent mesh units 171, and the first end of the switch T2 and The second terminal is electrically connected to the sensing data line SDL, and the control terminal of the switch T2 is used to receive the control signal CTL1 from the control circuit 210. Wherein, when the first switch 1721 and the second switch 1722 are turned on, the first switch 1721 will receive the enable signal EN provided by the control circuit 210, and turn on the switch 1712 of the sensing unit 1711 according to the enable signal EN to sense The sensing signal SenS sensed by the electrode 1713 is transmitted to the control circuit 210 via the second switch 1722 and the sensing data line SDL.

Please refer to Figure 2C and Figure 2D, Figure 2C is based on this disclosure A schematic diagram of the first sensing matrix 170 according to another embodiment of the document is shown, and FIG. 2D is a schematic diagram of the first sensing matrix 170 according to another embodiment of the present disclosure. In another embodiment, if the number of switches in the switch unit 172 will affect the number of traces and the problem of excessive resistance and capacitance loading (RC loading) on the traces will occur. Therefore, it is possible to adjust the grid unit 171 The number of sensing units 1711 is used to reduce the number of switches of the switch unit 172. As shown in Figure 2C, for example, the grid unit 171 includes 4 sensing units 1711, and there are 12 sensing units 1711 in total. However, there are switch units 172 only in the row direction, which means that there are only in the row direction. First switch 1721. After the first switch 1721 is turned on by the control signal CTL1, the first switch 1721 transmits the enable signal EN to the sensing unit 1711 via the sensing gate line SGL to turn on the switch 1712, and then the sensing electrode 1713 senses The signal SenS is transmitted to the control circuit 210 via the sensing data line SDL.

In view of the above, as shown in Figure 2D, for example, the grid unit 171 includes 3 sensing units 1711, and there are 12 sensing units 1711 in total, but there are only switch units 172 in the column direction, meaning that there are only There is a second switch 1722 in the column direction. When the second switch 1722 is turned on by the control signal CTL1, the control circuit 210 directly transmits the enable signal EN to the sensing unit 1711 through the sensing gate line SGL to turn on the switch 1712, and then the sensing electrode 1713 senses The signal SenS is transmitted to the control circuit 210 via the second switch 1722 and the sensing data line SDL. Therefore, by using the embodiments shown in FIG. 2C and FIG. 2D, the number of switches in the switch unit 172 can be reduced, and the aforementioned operations can still be performed, achieving the effect of reducing the resistance and capacitance load on the trace.

In another embodiment, please refer to FIG. 2E. FIG. 2E is a schematic diagram of the first sensing matrix 170 according to another embodiment of the present disclosure. As shown in FIG. 2E, a part of the switch 172A of the switch unit 172 is located in the display area AA, and the other part of the switch 172P is located in the peripheral area PA. In this embodiment, the switch 172P located in the peripheral area PA can increase the space in the display area AA and improve the resolution of the sensing unit 1711. In another embodiment, the switches of the switch unit 172 may all be located in the display area AA, and the present disclosure is not limited thereto.

Please refer to FIG. 3A. FIG. 3A is a schematic diagram of the second sensing matrix 180 according to an embodiment of the present disclosure. As shown in FIG. 3A, the second sensing matrix 180 has a common electrode 181 and a plurality of opening units 182, and is used to receive a common signal COM. The second sensing matrix 180 can be implemented as a transparent conductive film of indium tin oxide ( ITO). In order to improve the light transmittance of the display panel, the opening unit 182 of the second sensing matrix 180 overlaps the opening area of the pixel circuit in the vertical projection direction of the substrate 120.

Please refer to FIGS. 3B and 3C. FIG. 3B is a schematic diagram of a second sensing matrix 180 according to another embodiment of the present disclosure, and FIG. 3C is a second sensing according to another embodiment of the present disclosure Schematic diagram of matrix 180. In another embodiment, in order to reduce the interference between the signal of the second sensing matrix 180 and the signal on the sensing data line SDL or the sensing gate line SGL, the second sensing matrix 180 may be cut in the row direction or the column direction . As shown in FIG. 3B, the second sensing matrix 180 is cut in the row direction, and is connected to each other via wires outside the display area AA to receive the common signal COM. In the same way, as shown in Figure 3C, the second sensing matrix 180 is cut in the column direction. The wiring connection outside the area AA is used to receive the common signal COM.

In another embodiment, FIG. 4A is a schematic diagram of the second sensing matrix 180 according to another embodiment of the present disclosure. As shown in FIG. 4A, the second sensing matrix 180 has a plurality of common electrodes 181, a plurality of opening units 182, and a switch unit 183 (not shown in FIG. 4A). The second sensing matrix 180 is used to receive the control signal CTL2 and the common signal COM from the control circuit 210.

Please refer to FIG. 4B. FIG. 4B is an enlarged schematic diagram of the area A2 in FIG. 4A. In the embodiment shown in FIG. 4B, the area A2 includes four common electrodes 181, and the common electrode 181 includes a plurality of opening units 182. The disclosure is not limited to this. Among them, the opening unit 182 roughly corresponds to the sensing electrode 1713 and the pixel unit. As shown in Fig. 4B, the switch unit 183 includes 12 switches. Among the 12 switches, there are two types of switches. Some of the switches are electrically connected to two adjacent common electrodes 181. Take the switch 1831 as an example. The first terminal of the switch 1831 is electrically connected to the common electrode 181, the second terminal of the switch 1831 is electrically connected to the other common electrode 181, and the control terminal of the switch 1831 is used to receive the control signal CTL2 from the control circuit 210.

In view of the above, another part of the switch takes the switch 1832 as an example. The first terminal of the switch 1832 is electrically connected to the common electrode 181, and the second terminal of the switch 1832 is used to receive the common signal COM provided by the control circuit. The control terminal of the switch 1832 It is used to receive the control signal CTL2 from the control circuit 210. When the switch unit 183 is turned on according to the control signal CTL2, the second sensing matrix 180 can be regarded as a whole layer of electrodes. During this time, if you touch The pressure change will change the cell gap between the second sensing matrix 180 and the touch sensing matrix 140, resulting in a change in the capacitance value, thereby achieving the effect of pressure sensing (Force touch).

Please refer to FIG. 4C and FIG. 4D. FIG. 4C is a schematic diagram of a second sensing matrix 180 according to another embodiment of the present disclosure, and FIG. 4D is a second sensing matrix according to another embodiment of the present disclosure. 180 schematic diagram. In another embodiment, if the number of switches in the switch unit 183, it will affect the number of wires and cause the problem of excessively large RC loading on the wires. Therefore, the number of switches in the switch unit 183 can be reduced. To reduce the number of traces. As shown in FIG. 4C, for example, dividing the common electrode 181 into two columns and multiple columns means that there are only switch units 183 in the row direction. After the switch unit 183 is turned on by the control signal CTL2, the switch unit 183 transmits the common signal COM to the common electrode 181 via the wiring. Similarly, as shown in FIG. 4D, the common electrode 181 is divided into multiple columns and two columns, which means that there are only switch units 183 in the column direction. After the switch unit 183 is turned on by the control signal CTL2, the switch unit 183 transmits the common signal COM to the common electrode 181 via the wiring.

In another embodiment, please refer to FIG. 4E. FIG. 4E is a schematic diagram of the second sensing matrix 180 according to another embodiment of the present disclosure. As shown in FIG. 4E, a part of the switch 183A of the switch unit 183 is located in the display area AA, and another part of the switch 183P is located in the peripheral area PA. In this embodiment, the switch 183P located in the peripheral area PA can increase the space in the display area AA and increase the number of opening units 182. At the same time, with the aforementioned embodiment in Figure 2E, the resolution of the sensing unit 1711 can be improved. . Yu another real In the embodiment, the switches of the switch unit 183 may also be located in the display area AA, and the present disclosure is not limited to this.

Please also refer to Figure 5A. FIG. 5A is a schematic diagram of a touch sensing matrix 140 according to an embodiment of the present disclosure. As shown in FIG. 5A, the touch sensing matrix 140 includes a plurality of touch electrodes 141 and a touch common electrode 142. The touch common electrode 142 and the touch electrode 141 are electrically insulated from each other and formed in the touch sensor. Measure the periphery of the matrix 140. The touch electrodes 141 and the common touch electrodes 142 are electrically connected to the control circuit 210, respectively. The touch electrodes 141 are arranged in a matrix. One side of the substrate 110 is opposite to the other side of the substrate 120. The common touch electrodes 142 can be It is implemented as a mesh metal electrode or indium tin oxide transparent conductive film (ITO). The control circuit 210 is used for transmitting the first driving signal DS1 to the touch electrode 141 and the second driving signal DS2 to the touch common electrode 142 respectively. In one embodiment, the first driving signal DS1 may be a common voltage signal or a touch signal, and the second driving signal DS2 may be a common voltage signal or a touch synchronous driving signal.

In another embodiment, please also refer to FIG. 5B. FIG. 5B is a schematic diagram of the touch sensing matrix 140 according to an embodiment of the present disclosure. As shown in FIG. 5B, the touch sensing matrix 140 includes a plurality of touch electrodes 141. The touch electrodes 141 are respectively electrically connected to the control circuit 210, and the touch electrodes 141 are arranged in a matrix. The control circuit 210 is used for respectively transmitting the driving signal DS to the touch electrode 141, and the driving signal DS may be a Vcom signal or a touch signal.

Next, please also refer to Figure 6A. Fig. 6A is a cross-sectional line along Fig. 2A, Fig. 3C and Fig. 5B according to an embodiment of the present disclosure AA' simplified cross-sectional schematic diagram. As shown in FIG. 6A, the grid unit 171 includes two sensing units 1711, and the grid unit 171 is located between the substrate 120 and the second sensing matrix 180. Among them, the sensing electrode 1713 roughly corresponds to the opening unit 182, and the switch 1712 roughly corresponds to the common electrode 181. The color filter layer 160 is disposed between the second sensing matrix 180 and the display medium 150. One touch electrode 141 roughly corresponds to the two grid units 171 in the direction of the section line AA'. Therefore, the projected area of the touch electrode 141 in the vertical projection direction of one side of the substrate 110 is larger than the grid unit 171 The projected area in the vertical projection direction on one side of the substrate 110. The projected area of the touch electrode 141 in the vertical projection direction on one side of the substrate 110 is substantially the same as the projected area of the grid unit 171 and the switch unit 172 in the vertical projection direction on one side of the substrate 110, and the switch The wire W1 of the unit 172 substantially corresponds to the common electrode 181.

Then, please also refer to Figure 6B. FIG. 6B is a simplified schematic cross-sectional view taken along the section line AA' in FIG. 2A, FIG. 3C, and FIG. 5A according to an embodiment of the present disclosure. The cross-sectional view of the touch display panel 100 shown in FIG. 6B is substantially the same as that in FIG. 6A, with the difference being the touch common electrode 142. As shown in FIG. 6B, one touch electrode 141 is on the section line AA' The direction roughly corresponds to the two grid units 171, so the projected area of the touch electrode 141 in the vertical projection direction on one side of the substrate 110 is the same as that of the grid unit 171 in the vertical projection direction on one side of the substrate 110. The projected area is roughly the same. The projected area of the touch common electrode 142 in the vertical projection direction on one side of the substrate 110 is substantially the same as the projected area of the switch unit 172 in the vertical projection direction on one side of the substrate 110.

In view of the above, it is worth noting that in Figure 6A, the section line AA' corresponds to the two grid units 171 in Figure 2A, the three opening units 182 in Figure 3C, and the one touch screen in Figure 5B. Electrode 141. In FIG. 6B, the section line AA' corresponds to the two mesh units 171 in FIG. 2A, the three opening units 182 in FIG. 3C, and one touch electrode 141 in FIG. 5A. This correspondence is only an exemplary representation of the correspondence between the grid unit 171, the opening unit 182, and the touch electrode 141, and the present case is not limited to this.

Then, please refer to Figure 6C and Figure 6D together. Fig. 6C is a simplified cross-sectional view taken along line BB' in Fig. 2A, Fig. 4A, and Fig. 5B according to an embodiment of the present disclosure, and Fig. 6D is a schematic diagram of an embodiment according to the present disclosure. Figure 2A, Figure 4A, and Figure 5B are simplified cross-sectional schematic diagrams of the section line CC'. The difference between the cross-sectional view of the touch display panel 100 shown in FIG. 6C and the cross-sectional view of the touch display panel 100 shown in FIG. 6A is that the implementation of the second sensing matrix 180 is different. As shown in Fig. 6C, the section line BB' is along the sensing gate line SGL in Fig. 2B, the switch unit 172 is located between the substrate 120 and the second sensing matrix 180, and both ends of the switch unit 172 are electrically connected. Connect to the sense gate line SGL. The wire W2 is used to transmit the control signal CTL2 of the switch unit 183 in Figure 4C.

Next, referring to the section line CC' shown in FIG. 6D again, the switch unit 183 is disposed between the substrate 120 and the second sensing matrix 180, and both ends of the switch unit 183 are electrically connected to the common electrode 181. Wherein, the wire W1 is used to transmit the control signal CTL1 of the switch unit 172 in FIG. 2B, and the sensing data line SDL substantially corresponds to the common electrode 181. In accordance with the above, the switch unit 183 of the second sensing matrix 180 and the switch unit of the first sensing matrix 170 172 is located on the same layer, both ends of the switch unit 172 are electrically connected to the sensing gate line SGL, and both ends of the switch unit 183 are electrically connected to the common electrode 181.

In view of the above, it is worth noting that, in Figure 6C, the section line BB' corresponds to the two grid units 171 in Figure 2A, the four opening units 182 in Figure 4A, and the one touch screen in Figure 5B. Electrode 141. In FIG. 6D, the section line CC' corresponds to the two grid units 171 in FIG. 2A, the four opening units 182 in FIG. 4A, and one touch electrode 141 in FIG. 5B. This correspondence is only an exemplary representation of the correspondence between the grid unit 171, the opening unit 182, and the touch electrode 141, and the present case is not limited to this.

Please refer to FIG. 6E. FIG. 6E is a schematic diagram of the cross-section of the wire in area D in FIG. 4C. In the embodiment shown in Fig. 6E, area D represents the connection mode of the wire W2 transmitting the control signal CTL2 in the switch unit 183. The wire W2 is located on the lower surface of the insulating layer L1 to connect the gate terminal of the switch unit 183. There will be through holes H1 and H2 on the insulating layer L1. The wire W2 will pass through the through hole H1 and pass through the insulating layer L1 to the upper surface of the insulating layer L1. The wire W1 is also located on the upper surface of the insulating layer L1. Then, after the wire W2 crosses the transistor of the switch unit 183, it returns to the lower surface of the insulating layer L1 through the through hole H2. Among them, the wire W2 substantially corresponds to the common electrode 181. It is worth noting that the transistor is not shown in Figure 6E, only the way the wire W1 is connected to the gate terminal of the transistor is shown.

Then, please refer to Figure 6F and Figure 6G together. FIG. 6F is a simplified cross-sectional view taken along line BB in FIG. 2A, FIG. 4A, and FIG. 5A according to an embodiment of the present disclosure, and FIG. 6G is a diagram along the line according to an embodiment of the present disclosure Sectional lines in figures 2A, 4A and 5A The simplified cross-sectional schematic diagram of CC'. The cross-sectional view of the touch display panel 100 shown in FIG. 6F and FIG. 6G is substantially the same as that in FIG. 6C. The difference lies in the touch common electrode 142. As shown in FIG. 6F and FIG. 6G, the touch is common The projection area of the electrode 142 in the vertical projection direction on one side of the substrate 110 is substantially the same as the projection area of the switch unit 172 in the vertical projection direction on one side of the substrate 110, and the touch common electrode 142 is on the substrate 110 The projected area in the vertical projection direction of one side is substantially the same as the projected area in the vertical projection direction of the switch unit 183 on one side of the substrate 110.

In view of the above, it is worth noting that in Fig. 6F, the section line BB' corresponds to the 2 grid units 171 in Fig. 2A, the 4 opening units 182 in Fig. 4A, and the one touch screen in Fig. 5A. Electrode 141. In FIG. 6G, the section line CC' corresponds to the two grid units 171 in FIG. 2A, the four opening units 182 in FIG. 4A, and one touch electrode 141 in FIG. 5A. This correspondence is only an exemplary representation of the correspondence between the grid unit 171, the opening unit 182, and the touch electrode 141, and the present case is not limited to this.

Next, please refer to FIG. 7A, which is a timing diagram of the touch display panel 100 according to an embodiment of the present disclosure. In one embodiment, as shown in FIG. 7A, during the display stage TP1, the gate drive signal G(n) is the enable level VGH, and the first drive signal DS1, the second drive signal DS2, and The common signal COM is the first level V1, and the first level may be the common voltage level provided by the control circuit 210. The control signal CTL1 is the enable level VGH to turn on the switch unit 172. However, if the enable signal EN is at the disable level VGL during the display phase TP1, the sensing signal SenS will be at the low level V2.

In view of the above, in the touch detection stage TP2, the gate drive signal G(n) of the touch display panel 100 is the disable level VGL, the first drive signal DS1 and the second drive signal DS2 are the high level VH, the high level The level VH is between the enable level VGH and the first level V1. The control signal CTL1 is the disable level VGL to turn off the switch unit 172. At this time, the first sensing matrix 170 is in a floating state, the sensing signal SenS and the enable signal EN are coupled to a coupling level VC, and at the same time The control circuit 210 transmits a synchronization signal synchronized with the first driving signal DS1 and the second driving signal DS2 to the second sensing matrix 180, so the common signal COM is also at a high level VH.

In view of the above, since the entire layer of the first sensing matrix 170 is in a floating state, and the entire layer of the second sensing matrix 180 also receives the synchronization signal synchronized with the touch sensing matrix 140, during the touch detection phase TP2 No capacitance is generated between the first sensing matrix 170, the second sensing matrix 180, and the touch sensing matrix 140, so there is no problem of excessive resistance and capacitance load; the touch sensing matrix 140 can also be The touch signal is coupled to the outside through the floating first sensing matrix 170 to maintain the original touch effect and avoid signal shadowing.

In the fingerprint detection phase TP3, the first driving signal DS1 and the second driving signal DS2 are at the first level V1, and the control signal CTL1 is the enable level VGH to turn on the switch unit 172, and the enable signal EN is at the enable position At the quasi VGH, the sensing electrode 1713 is used to output the sensing signal SenS, and the sensing signal SenS is at the high level VH at this time.

In another embodiment, the fingerprint detection phase TP3 can be combined with the display phase TP1, and fingerprint detection can be performed at the same time during display. Please refer to FIG. 7B. FIG. 7B is a touch display according to another embodiment of the present disclosure A timing diagram of the panel 100. The timing difference between Figure 7B and Figure 7A is that fingerprint detection is also performed during the display phase TP1. As shown in Figure 7B, the sensing signal SenS is at a high level at this time, and the enable signal EN is here. When is the enable level VGH. The rest of the signal operation is the same as the foregoing, and will not be repeated here.

In another embodiment, please refer to FIG. 7C. FIG. 7C is a timing diagram of the touch display panel 100 according to another embodiment of the present disclosure. In this embodiment, the display stage TP1 and the fingerprint detection stage TP3 are described separately. Of course, the display stage TP1 and the fingerprint detection stage TP3 can also be combined as described in the previous embodiment, and the disclosure is not limited to this. The timing difference between Figure 7C and Figure 7A is that the control signal CTL2 is further used to turn on the second sensing matrix 180, and the control signal CTL2 is maintained during the display phase TP1, the touch detection phase TP2, and the fingerprint detection phase TP3. At the enable level VGH, the second sensing matrix 180 can be regarded as a whole layer of electrodes, and the control circuit 210 will transmit a synchronization signal synchronized with the first driving signal DS1 and the second driving signal DS2 to the second sensing matrix 180. Therefore, during the touch detection phase TP2, the second sensing matrix 180 and the touch sensing matrix 140 can achieve the effect of force touch.

In another embodiment, please refer to FIG. 7D, which is a timing diagram of the touch display panel 100 according to another embodiment of the present disclosure. In this embodiment, the display stage TP1 and the fingerprint detection stage TP3 are described separately. Of course, the display stage TP1 and the fingerprint detection stage TP3 can also be combined as described in the previous embodiment, and the disclosure is not limited to this. The timing difference between Figure 7C and Figure 7D is that in the touch detection phase TP2, the control The signal CTL2 is switched to the disable level VGL to turn off the switch unit 183. At this time, the second sensing matrix 180 is in a floating state, and the common signal COM is coupled to a coupling level VC. At this time, since the entire layers of the first sensing matrix 170 and the second sensing matrix 180 are in a floating state, the touch signal of the touch sensing matrix 140 can pass through the floating first sensing matrix 170 and the second sensing matrix 170 The sensing matrix 180 is coupled to the outside to maintain the original touch effect and avoid signal shadowing.

In another embodiment, please refer to FIG. 8. FIG. 8 is a schematic diagram of the first sensing matrix 170 according to another embodiment of the present disclosure. The difference between the embodiment shown in Fig. 8 and the embodiment shown in Fig. 2B is that the embodiment shown in Fig. 8 lacks the switch unit 172, and the control circuit 210 directly uses the sensing gate line SGL and the sensing data line SDL. Connect to the sensing unit 1711. The control circuit 210 is used to turn on the switch 1712 according to the enable signals EN(1)~EN(n), and the sensing signals SenS(1)~SenS(m) sensed by the sensing electrodes 1713 are directly transmitted via the sensing data line SDL To the control circuit 210.

In view of the above, the second sensing matrix 180 shown in FIG. 3A and the touch sensing matrix 140 shown in FIG. 5B can be used to match the first sensing matrix 170 shown in FIG. 8. In this embodiment, in order to prevent the first sensing matrix 170 from causing signal shielding to the touch sensing matrix 140, the control circuit 210 generates a synchronization signal to the first sensing matrix 170 and the second sensing matrix. 180. Under this operation, in the touch detection phase TP2, the second sensing matrix 180 and the touch sensing matrix 140 can still achieve the effect of force touch.

In summary, the main advantages of the touch display panel of the present disclosure The second sensing matrix is used to shield the signal of the sensing electrode to prevent the signal of the sensing electrode from causing interference to the pixel circuit, and during the period of the touch electrode sensing, the synchronization signal provided by the control circuit or the second The sensing matrix is kept in a floating state to reduce the influence of the sensing electrodes on the touch electrodes. Furthermore, when the touch pressure is changed, the cell gap between the second sensing matrix and the touch electrode will change, resulting in a change in the capacitance value, thereby achieving the effect of force touch. .

Certain words are used in the specification and the scope of the patent application to refer to specific elements. However, those with ordinary knowledge in the technical field should understand that the same element may be called by different terms. The specification and the scope of the patent application do not use the difference in names as a way of distinguishing elements, but the difference in function of the elements as the basis for distinguishing. The "including" mentioned in the specification and the scope of the patent application is an open term, so it should be interpreted as "including but not limited to". In addition, "coupling" here includes any direct and indirect connection means. Therefore, if the text describes that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection, wireless transmission, optical transmission, or other signal connection methods, or through other elements or connections. The means is indirectly connected to the second element electrically or signally.

In addition, unless otherwise specified in the specification, any term in the singular case also includes the meaning of the plural case.

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should fall within the scope of the present invention.

100‧‧‧Touch display panel

110、120‧‧‧Substrate

130‧‧‧Pixel array layer

140‧‧‧Touch sensor matrix

150‧‧‧Display medium

160‧‧‧Color filter

170‧‧‧First sensing matrix

180‧‧‧Second sensing matrix

Claims (21)

A touch display panel has a display area and a peripheral area adjacent to the display area, including: a first sensing matrix, arranged on one side of a first substrate and the display area, including: a plurality of grid units Arranged in a matrix form, wherein each of the grid units includes at least one first electrode; and a first switch unit, which includes a plurality of switches, is arranged on one side adjacent to the grid units, wherein the switches The control terminal is used to receive a first control signal, one end of each of the switches is electrically connected to one of the grid units, and the switches are used to transmit a sensing signal according to the first control signal, Wherein some of the plurality of switches in the plurality of switches are respectively arranged between the adjacent grid cells, so that the adjacent grid cells are coupled through one of the plurality of switches; A second sensing matrix is disposed on one side of the first substrate and the display area. The second sensing matrix has at least one second electrode and is used to receive a common signal. It includes: a plurality of opening units, each The opening units overlap with the opening area of each pixel in a vertical projection direction of the first substrate. For example, in the touch display panel of claim 1, the switches further include: a plurality of first switches arranged adjacent to one of the grid units Side, wherein the control terminals of the first switches are used to receive the first control signal, one end of each of the first switches is used to output the sensing signal, and the other end of each of the first switches is electrically connected To one of these grid cells. For example, in the touch display panel of claim 1, the switches further include: a plurality of second switches arranged on a side adjacent to the grid units, wherein the control terminals of the second switches are used to receive the For the first control signal, one end of each of the second switches is used to receive an energy signal, and the other end of each of the first switches is electrically connected to one of the grid cells. For example, the touch display panel of claim 1, further comprising: a third sensing matrix disposed on one side of a second substrate, comprising: a plurality of third electrodes, the third electrodes are arranged in a matrix, wherein the A side of the first substrate is opposite to a side of the second substrate. The touch display panel of claim 4, wherein the three-sensing matrix further includes: a fourth electrode disposed between the adjacent third electrodes, and the fourth electrode and the third electrodes It is electrically insulated and formed around the third sensing matrix. For example, the touch display panel of claim 1, wherein a part of the switches are arranged in the peripheral area. The touch display panel of claim 1, wherein the at least one second electrode is electrically connected to each other, and is used to receive the common signal. The touch display panel of claim 4, wherein the second sensing matrix further includes: a second switch unit, including a plurality of third switches, arranged between the adjacent at least one second electrode, wherein the The control ends of the third switches are used to receive a second control signal, one end of each of the third switches is used to receive the common signal, and the other end of each of the third switches is electrically connected to The at least one second electrode. For example, the touch display panel of claim 8, wherein a part of the third switches are arranged in the peripheral area. Such as the touch display panel of claim 4, wherein the projection area of each of the grid units in the vertical projection direction on one side of the first substrate substantially coincides with each of the third electrodes. Such as the touch display panel of claim 5, wherein the projection of the first switch unit in the vertical projection direction on one side of the first substrate The shadow area substantially coincides with the fourth electrode. For example, the touch display panel of claim 4, further comprising: a color filter layer disposed between the second sensing matrix and a display medium; and a pixel array layer disposed on the second substrate and the third substrate Between the sensing matrix. For example, the touch display panel of claim 4, wherein during a first period, the first switch unit is turned off so that the grid units are in a floating state, and a driving signal is sequentially provided to the first period Three electrodes, so that the third sensing matrix performs a touch function; and in a second period, the first control signal is provided to turn on the first switch unit, and the grid units transmit the sensing signal to Make the first sensing matrix perform an identification function. The touch display panel of claim 8, wherein, in a first period, the first switch unit and the second switch unit are turned off, so that the grid units and the at least one second electrode are in a floating connection State, and sequentially provide a driving signal to the third electrodes, so that the third sensing matrix performs a touch function; and in a second period, provide the first control signal to turn on the first switch unit , And providing the second control signal to turn on the second switch unit, and the grid units transmit the sensing signal to make the first sensing matrix Perform a recognition function, and the second sensing matrix and the third sensing matrix perform a pressure sensing function. For example, the touch display panel of claim 8, wherein during a first period, the first switch unit is turned off so that the grid units are in a floating state, and the second control signal is turned on according to the second control signal. Two switch units, so that the at least one second electrode receives the common signal, and sequentially provides a driving signal to the third electrodes, so that the third sensing matrix performs a touch function; and During the period, the first switch unit is turned on according to the first control signal, and the second switch unit is turned on according to the second control signal, and the grid units transmit the sensing signal to make the first sensing matrix Perform a recognition function, and the second sensing matrix and the third sensing matrix perform a pressure sensing function. A touch display panel has a display area and a peripheral area adjacent to the display area, including: a first sensing matrix, arranged on one side of a first substrate and the display area, including: a plurality of first data Lines; a plurality of first gate lines; a plurality of first units, with a plurality of first switches and a plurality of first electrodes, the first switches have a first control terminal, a first terminal and a second terminal , The first control of each of the first switches The terminal is electrically connected to one of the first gate lines, the first terminal of each of the first switches is electrically connected to one of the first data lines, and each of the first The second end of the switch is electrically connected to one of the first electrodes; and a plurality of switches are respectively arranged between the adjacent first cells, so that the adjacent first cells pass through the switch One of the switches is coupled; and a second sensing matrix is disposed on one side of the first substrate. The second sensing matrix has at least one second electrode and is used to receive a common signal, including: a plurality of Opening units, each of the opening units overlaps the opening area of each pixel in a vertical projection direction of the first substrate. For example, the touch display panel of claim 16 further includes: a third sensing matrix disposed on one side of a second substrate, including: a plurality of third electrodes, the third electrodes are arranged in a matrix. A touch display panel has a display area and a peripheral area adjacent to the display area, including: a first electrode layer disposed on one side of a first substrate and the display area, including: a grid unit including A first electrode; a first switch unit, one end of the first switch unit is electrically connected to a sensing data signal line, the other end of the first switch unit is electrically connected Is electrically connected to the grid unit; and a switch is disposed adjacent to the grid unit so that two adjacent grid units are coupled through the switch; and a second electrode layer is disposed on one side of the first substrate And the display area, which is used to receive a common signal, includes: a second electrode; and an opening unit that overlaps with the opening area of a pixel in a vertical projection direction of the first substrate. In the touch display panel according to claim 18, the first electrode layer further includes: a second switch unit, one end of the second switch unit is electrically connected to a sensing gate signal line, and the second switch unit The other end is electrically connected to the grid unit. The touch display panel according to claim 19, further comprising: a third electrode layer disposed on one side of a second substrate, comprising: a third electrode; and a fourth electrode, the fourth electrode surrounding the The third electrode is provided, and the fourth electrode is electrically insulated from the third electrode; and a display array is provided between the second substrate and the third electrode layer, and one side of the first substrate is opposite to One side of the second substrate. The touch display panel of claim 19, wherein the second electrode layer further comprises: a third switch unit, one end of the third switch unit is electrically connected to a common signal line, and the third switch unit The other end is electrically connected to the second electrode.

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