TWI708177B - Touch display panel - Google Patents

Abstract

A touch display panel is provided, including a substrate, a plurality of pixels and touch electrodes within an active area, a first switch group and a second switch group. The touch electrodes overlap with multiple pixels, wherein the touch electrodes are electrically connected to a plurality of touch signal lines and the plurality of protection signal lines. The first switch group includes a plurality of sensing switches, wherein each of the touch electrodes receives a sensing signal from the corresponding touch signal line through the at least one sensing switch. The second switch group includes a plurality of protection switches, wherein each of the touch electrodes receives a protection signal from the corresponding protection signal line through the at least one protection switch. One of the first switch group and the second switch group is disposed in the active area, and the other of the first switch group and the second switch group is disposed outside the effective area of the substrate.

Description

Touch display panel

The present invention relates to a touch display technology, and especially relates to a touch display panel.

With the development of technology, touch display devices are widely used in daily life because of their friendly human-machine interface. Among them, capacitive touch technology reacts to the capacitance caused by touch objects (such as fingers, stylus) Change to determine the location of the touch point. The touch display panel can be roughly divided into two types: an external type and an in-cell type. The in-cell touch display panel has the advantages of thinner thickness and lighter weight. However, the design of the touch display panel needs to consider the structure of the display module and the layout of the touch sensing transmission line at the same time, and shield these transmission lines. The design of the sensing transmission line may affect the quality of the display screen or occupy the frame area of the panel. Therefore, how to ensure the quality of the display and reduce the size of the panel becomes an important issue.

The present invention provides a touch display panel, which has the effects of reducing the circuit layout area of the panel and maintaining the aperture ratio of the display panel.

An embodiment of the present invention provides a touch display panel including a substrate, a plurality of pixels, and a touch sensing layer. These pixel arrays are arranged in the effective area of the substrate. The touch sensing layer includes a plurality of touch electrodes, a first switch group and a second switch group. The touch electrodes overlap the pixels and are arranged in an array in the effective area. The touch electrodes are electrically connected to a plurality of touch signal lines and a plurality of protection signal lines. The first switch group includes a plurality of inductive switches, wherein each touch electrode receives an inductive driving signal from a corresponding touch signal line through at least one inductive switch. The second switch group includes a plurality of protection switches, wherein each touch electrode receives a protection signal from a corresponding protection signal line through at least one protection switch, wherein one of the first switch group and the second switch group is arranged in the effective area , And the other of the first switch group and the second switch group is disposed outside the effective area of the substrate.

Based on the foregoing, the touch display panel of the embodiment of the present invention is configured with an inductive switch or a protection switch in the effective area, and a protection switch or an inductive switch is configured outside the effective area. This reduces the circuit layout area outside the effective area and maintains the aperture ratio of the display panel, while maintaining the display quality.

10: Touch display panel

100: substrate

102: Touch sensing layer

104: induction line

106: induction circuit

110: The first switch group

112: Sensor switch

120: The second switch group

122: Protection switch

300, 400: black matrix pattern

AA: effective area

BMT, BMA: pattern

CL1: The first control line

CL2: Second control line

CS1: The first control signal

CS2: second control signal

DB: lower substrate area

DISP: Display period

GC1: The first protection control signal

GC2: The second protection control signal

N: sensor node

N0: contact node

R: Red sub-pixel

G: Green sub-pixel

B: Blue sub-pixel

PCL1: The first protection control line

PCL2: The second protection control line

PX: pixel

PL: Protection signal line

P: line P

SE, SE1, SE2: touch electrodes

SPX: Sub-pixel

TOUCH: During touch

TOU1: the first period

TOU2: Second period

TP: Inductive drive signal

TL, TL1, TL2: touch signal line

UB: Upper substrate area

VCOM: common voltage

VG: Protection signal

FIG. 1A is a schematic top view of a touch display panel according to an embodiment of the invention.

FIG. 1B is a schematic diagram of a partial area of a touch display panel according to an embodiment of the invention.

2 is a signal waveform diagram of a touch display panel according to an embodiment of the invention.

3 is a schematic diagram of a black matrix pattern of a touch display panel according to an embodiment of the invention.

4 is a schematic diagram of a black matrix pattern of a touch display panel according to an embodiment of the invention.

5 is a partial schematic diagram of a touch sensing layer of a touch display panel according to another embodiment of the present invention.

6 is a partial schematic diagram of a touch sensing layer of a touch display panel according to another embodiment of the present invention.

1A is a schematic top view of a touch display panel according to an embodiment of the present invention, and FIG. 1B is a schematic view of a partial area of a touch display panel according to an embodiment of the present invention. 1A, the touch display panel 10 is, for example, an in-cell touch panel, and the touch sensor is directly integrated on the display panel structure.

The touch display panel 10 includes at least a substrate 100, a plurality of pixels PX, and a touch sensing layer 102. The touch sensing layer 102 includes at least a plurality of touch electrodes SE, a sensing circuit 104, and a sensing circuit 106. The touch electrodes SE pass The sensing circuit 104 is electrically connected to the sensing circuit 106.

These pixel PX arrays are arranged in the active area (Active Area) AA of the substrate 100 to form a pixel array. Each pixel PX includes pixel electricity Poles and active components. The active element is, for example, a transistor switch. The first terminal of the active device is electrically connected to the pixel electrode, the second terminal is electrically connected to the data line to receive the display signal, and the control terminal is electrically connected to the scan line to turn on the switch according to the scan signal to drive the pixel PX.

The touch electrodes SE overlap with the pixels PX and are also arranged in an array in the effective area AA of the substrate 100. Here, the touch display panel 10 takes an in-cell structure capacitive touch panel as an example. The touch sensing layer 102 can be integrated in the internal structure of the display panel, sharing the substrate 100, and a single touch electrode SE overlaps multiple pictures. Vegetarian PX. The numbers of pixels PX and touch electrodes SE in FIG. 1A are only for illustration, and are not used to limit the present invention.

Please refer to FIG. 1B. The structure of FIG. 1B can be used as a schematic diagram of the touch sensing layer 102 of the touch display panel 10, and the pixel array, data lines, and scan lines of the touch display panel 10 are omitted. In FIG. 1B, these touch electrodes SE are electrically connected to a plurality of touch signal lines TL and a plurality of protection signal lines PL, wherein the sensing line 104 of FIG. 1A includes at least one of the touch signal line TL and the protection signal line PL One.

In addition to the plurality of touch electrodes SE, the touch sensing layer 102 further includes a first switch group 110 and a second switch group 120. The first switch group 110 includes a plurality of sensing switches 112 for allowing the touch electrodes SE in a sensing state to receive sensing driving signals. Each touch electrode SE receives a sensing driving signal from a corresponding touch signal line TL through at least one sensing switch 112. The second switch group 120 includes a plurality of protection switches 122 for allowing the touch electrodes in the non-sensing state to receive guarding signals. Each touch electrode SE is connected to the corresponding protection signal line PL through at least one protection switch 122 Receive protection signal. The induction switch 112 or the protection switch 122 is, for example, a transistor. The switches in the following embodiments are implemented in the manner of NMOS transistors, but are not limited.

It is worth mentioning that one of the first switch group 110 and the second switch group 120 is disposed in the effective area AA, and the other of the first switch group 110 and the second switch group 120 is disposed on the effective area of the substrate 100. Outside area AA.

In the embodiment of FIG. 1B, the first switch group 110 is disposed in the substrate area outside the effective area AA of the substrate 100, and the second switch group 120 is disposed in the effective area AA. More specifically, these inductive switches 112 form a multiplexer circuit and are arranged on a certain side of the effective area AA, and each protection switch 122 is arranged in the effective area AA according to the position of the corresponding touch electrode SE. In FIG. 1B, the first switch group 110 and the sensing circuit 106 are arranged together in the lower substrate area DB below the effective area AA.

In this embodiment, the touch signal line TL and the touch electrode SE have a one-to-one relationship. The touch electrodes SE in different columns in the same row are coupled to different touch signal lines TL. In addition, one touch electrode SE may have one or more sensing nodes N. The touch electrode SE in FIG. 1B only shows two sensing nodes N as an illustration, but it is not limited. The sensing nodes N of the same touch electrode SE are electrically connected to the same touch signal line TL through at least one via and then coupled to the first end of the sensing switch 112, and the second end of the sensing switch 112 is coupled to the sensing Circuit 106. After the sensing switch 112 is turned on, the sensing driving signal is sent from the sensing circuit 106 and then transmitted through the sensing switch 112 on the touch signal line TL, and then transmitted to the corresponding touch electrode SE through a via to detect the sensing node N Change of capacitance to determine the occurrence of touch events position.

In particular, two touch electrodes SE located in adjacent columns in the same row can receive the same induction driving signal, but the induction switches 112 connected to them are controlled by different control signals, such as the first control signal. CS1 and the second control signal CS2. For example, the control terminal of the sensor switch 112 connected to the touch electrodes SE of the odd-numbered columns (counted from bottom to top) is coupled to the first control line CL1 to be controlled by the first control signal CS1, and the touch-control of the even columns The control terminal of the sensing switch 112 connected to the electrode SE is coupled to the second control line CL2 to be controlled by the second control signal CS2. In other words, the sensing switches 112 connected to two adjacent touch signal lines TL form a one-to-two multiplexer, so the same sensing driving signal can be transmitted to two different touch electrodes SE. However, the present invention is not limited to this. In other embodiments, a plurality of inductive switches 112 may also form a one-to-three or other one-to-many multiplexer.

The touch electrodes SE in the same row are commonly connected to the same protection signal line PL. That is to say, the touch electrodes SE in different rows are electrically connected to different protection signal lines PL. In this embodiment, the touch electrode SE may not need to be coupled to the protection signal line PL through a through hole, but may be coupled to the protection signal line PL through the protection switch 122. One end of the protection switch 122 is coupled to the contact node N0 of the contact control electrode SE, and the other end is coupled to the protection signal line PL to control whether the touch electrode SE receives the protection signal.

The control terminals of the protection switches 122 connected to the two touch electrodes SE located in adjacent columns in the same row are controlled by different protection control signals, such as the first protection control signal GC1 and the second protection control signal GC2, but the same The protection switches 122 connected to the touch electrodes SE of the column are controlled by the same protection control signal. for example, The protection switch 122 connected to the touch electrode SE of the odd-numbered column is coupled to the first protection control line PCL1 to be controlled by the first protection control signal GC1, and the protection switch 122 connected to the touch-control electrode SE of the even-numbered column is coupled to the second protection The control line PCL2 is controlled by the second protection control signal GC2.

In this embodiment, the same protection control signal can also be divided to control multiple protection switches 122, and it is not limited to two.

2 is a signal waveform diagram of a touch display panel according to an embodiment of the invention. The waveform diagram of FIG. 2 can be applied to the embodiments of FIGS. 1A and 1B, and two adjacent touch electrodes SE1 and SE2 in the Pth row in FIG. 1B are taken as an example for description. The touch electrode SE1 is located in the third column (counted from bottom to top) in the P-th row, and the touch electrode SE2 is located in the fourth column in the P-th row. The sensing switch 112 connected to the touch electrode SE1 is coupled to the first control line CL1 and controlled by the first control signal CS1, and the protection switch 122 connected thereto is coupled to the first protection control line PCL1 and controlled by the first protection control Signal GC1. The sensing switch 112 connected to the touch electrode SE2 is coupled to the second control line CL2 and controlled by the second control signal CS2, and the protection switch 122 connected thereto is coupled to the second protection control line PCL2 and controlled by the second protection control Signal GC2.

When the touch display panel 10 is in the display period DISP, the touch electrode SE1 and the touch electrode SE2 are both applied with a common voltage VCOM. When the touch display panel 10 is in the touch period TOUCH, in the first period TOU1, the first control signal CS1 is in the enable state, and the first protection control signal GC1 is in the disable state, and the touch The sensing switch 112 of the electrode SE1 is turned on and the protection switch 122 is turned off. The touch electrode SE1 is in the sensing mode to receive the sensing drive signal No. TP. In contrast, the second control signal CS2 is in a disabled state, and the second protection control signal GC2 is in an enabled state, the sensing switch 112 of the touch electrode SE2 is turned off and the protection switch 122 is turned on. The touch electrode SE2 is in the non-sensing mode and cannot receive the sensing driving signal TP, but receives the protection signal VG to prevent the potential of the touch electrode SE2 in the non-sensing mode from being in a floating state.

In the second period TOU2, the first control signal CS1 is in the disabled state and the first protection control signal GC1 is in the enabled state, the sensing switch 112 of the touch electrode SE1 is turned off and the protection switch 122 is turned on. The touch electrode SE1 is in a non-sensing mode to receive the protection signal VG. In contrast, the second control signal CS2 is in the enabled state, and the second protection control signal GC2 is in the disabled state, and the touch electrode SE2 is in the sensing mode to receive the sensing driving signal TP.

In this embodiment, the protection signal VG can be synchronized with the induction driving signal TP provided by the induction circuit 104. As shown in FIG. 2, the protection signal VG and the inductive driving signal TP can have the same waveform to reduce parasitic capacitance.

3 is a schematic diagram of a black matrix pattern of a touch display panel according to an embodiment of the invention. The Black Matrix pattern 300 can be applied to the touch display panel 10 of the above embodiment. In FIG. 3, one touch electrode SE may overlap a plurality of sub-pixels SPX, where the sub-pixel SPX includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. A plurality of sub-pixels SPX can form a pixel unit. In some embodiments, the pixel PX in FIG. 1A may refer to a pixel unit or a sub-pixel SPX. The arrangement of the sub-pixels SPX in FIG. 3 is only for illustration, and is not intended to limit the present invention.

In this embodiment, the same number of protection switches 122 are arranged in each touch electrode SE corresponding to the number of these sub-pixels SPX. That is to say, each protection switch 122 in the touch electrode SE is configured corresponding to one sub-pixel SPX. The pattern width of the black matrix pattern 300 in the first direction and in the second direction may be different.

The pattern BMA of the black matrix pattern 300 in the lateral direction (first direction) can be used to cover the protection switch 122, the first protection control line PCL1, the second protection control line PCL2, and other traces. The pattern BMT in the longitudinal direction (second direction) can be used to cover the protection signal line PL and other traces. Because the first switch group 110 is arranged outside the effective area AA, the black matrix pattern 300 only needs to spend a large area to cover the protection switch 122 in the horizontal direction, and only needs to cover only the smaller traces in the vertical direction. The pattern BMT can be thinner than the pattern BMA.

In the present invention, the number of switches of the first switch group 110 or the second switch group 120 arranged in the effective area AA may be less than or equal to the second switch group 120 or the first switch group arranged outside the effective area AA The number of multiple switches of 110. For example, in the embodiment of FIG. 3, the number of sub-pixels SPX is equal to the number of protection switches 122, and the number of protection switches 122 is also the same as the number of inductive switches 112. However, in other embodiments, the touch display panel 10 can also configure the number of protection switches 122 corresponding to the number of sub-pixels SPX, so that the number of sub-pixels SPX and the number of sensor switches 112 are both greater than the number of protection switches. The number of switches 122. .

According to design requirements, the protection switch 122 of the present invention can be The color of SPX is selectively arranged in the effective area AA. In one embodiment, the protection switches 122 are arranged corresponding to the positions of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and do not correspond to the positions of the sub-pixels SPX. A plurality of green sub-pixels G are arranged. The designer preferentially chooses to arrange the protection switch 122 corresponding to the edge of the red sub-pixel R and the blue sub-pixel B, and not to arrange the protection switch 122 at the edge of the green sub-pixel G. In another embodiment, the protection switches 122 are configured to correspond to one of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and do not correspond to these sub-pixels. Sub-pixels of other colors in SPX are arranged. The designer chooses to configure a protection switch 122 on the edge of the red sub-pixel R, while ignoring the blue sub-pixel B and the green sub-pixel G. In another embodiment, the designer chooses to configure the protection switch 122 for the blue sub-pixel B, while ignoring the red sub-pixel R and the green sub-pixel G. The present invention does not limit the color selection of the sub-pixel SPX.

In other embodiments, the designer can also selectively configure the protection switch 122 according to the position of the sub-pixel SPX. In another embodiment, the designer selects some sub-pixels SPX to configure the protection switches 122 so that the protection switches 122 are evenly distributed in the effective area AA.

In one embodiment, the number of transistor switches (the number of the protection switch 122 and the sensor switch 112) arranged in the effective area AA and the number of transistor switches (the protection switch 122 and the sensor switch 112) arranged outside the effective area AA The other number of 112) is different.

In one embodiment, the protection switch 122 and the induction switch 112 are transistors And the channel length L of each transistor is the same, and the channel width of a single transistor arranged outside the effective area AA is called W1, and the total channel width of all transistors in the switch group is Wt. The channel width of a single transistor arranged in the effective area AA is called W2, and the total number of sub-pixels SPX or the number of transistors in the switch group arranged outside the effective area AA is called A1. Under the condition that each protection switch 122 and each induction switch 112 have the same channel length L, the total number of transistors of the switch group arranged in the effective area AA will be less than or equal to A1 and greater than or equal to 0.05*Wt/W2.

In an embodiment, the first switch group 110 is disposed in the lower substrate area DB, and the second switch group 120 is disposed in the effective area AA. The size of the transistors of the protection switch 122 and the induction switch 112 may be different, but here the channel length L of each protection switch 122 and each induction switch 112 is 4 micrometers (μm). The channel width W1 of the sensor switch 112 is 1 micron, and the channel width W2 of the protection switch 122 is 5 microns. The touch display panel 10 has 400 sub-pixels SPX. The first switch group 110 corresponds to the total number of sub-pixels SPX. The same number (400) of sensor switches 112 are provided in the lower substrate area DB, so the total channel width of all the sensor switches 112 Wt is 400 microns. The number of protection switches 122 disposed in the effective area AA can be up to 400 at most, and at least four.

In this embodiment, the first switch group 110 or the second switch group 120 has a reference ratio X, where X=the sum of the channel widths of all transistors in the switch group/the channel width of a single transistor. Corresponding to the reference ratio X1 of the first switch group 110 outside the effective area AA, X1=A1*W1/L1, where L1 is the channel length of the sensor switch 112. The reference ratio X2 of the second switch group 120 corresponding to the effective area AA will fall between A1*W2/L2 and Within the range of 0.05*X1, where L2 is the channel length of the protection switch 122.

In another embodiment, the first switch group 110 is disposed in the lower substrate area DB, and the second switch group 120 is disposed in the effective area AA. The channel length L1 of the sensor switch 112 is 4 micrometers, and the channel width W1 is 1 micrometer. The channel length L2 of the protection switch 122 is, for example, in the range of 2 μm to 20 μm, such as 8 μm, and the channel width W2 is 5 μm. The first switch group 110 is provided with 400 inductive switches 112 in the lower substrate area DB, so the total channel width Wt of all the inductive switches 112 is also 400 microns. The reference ratio X1 of the first switch group 110 is also 400/4, and the reference ratio X2 of the second switch group 120 will fall within the range of A1*W2/L2 to 0.05*X1, so the number of protection switches 122 will be greater than or Equal to 8 and less than or equal to 400.

4 is a schematic diagram of a black matrix pattern of a touch display panel according to an embodiment of the invention. The black matrix pattern 400 can be applied to the touch display panel 10 of the above embodiment. In this embodiment, the sub-pixels SPX of three colors of red, blue and green are arranged alternately in the horizontal direction, and the designer chooses to configure the protection switch 122 only for the blue sub-pixel B in the horizontal direction, and in the vertical direction according to uniform intervals Configure the protection switch 122. In this embodiment, since the number of protection switches 122 in the effective area AA is reduced, only part of the pattern BMA needs to be widened, and part of the pattern BMA only needs to cover the traces, so only a smaller area is required, which can achieve Reduce the number of components used and maintain the aperture ratio.

5 is a partial schematic diagram of a touch sensing layer of a touch display panel according to another embodiment of the present invention. Please refer to FIG. 5. The structure of FIG. 5 can be applied to the touch sensing layer 102 of the touch display panel 10. In this embodiment, the first switch group 110 is set It is placed in the effective area AA, the second switch group 120 outside the effective area AA of the substrate area. More specifically, in this embodiment, each sensor switch 112 is disposed in the effective area AA corresponding to the position of the touch electrode SE, and the protection switches 122 are disposed on the substrate 100 on a certain side of the effective area AA. In FIG. 5, the sensing circuit 106 and the second switch group 120 are arranged in the lower substrate area DB below the effective area AA. Each touch electrode SE can be configured with one or more sensing switches 112 coupled to the touch control signal line TL. Each touch electrode SE in FIG. 5 shows only one sensor switch 112 as an illustration.

In this embodiment, the touch signal line TL and the touch electrode SE are not in a one-to-one relationship. The touch electrodes SE in the same row can be alternately coupled to the same touch signal line TL, but the sensing switches 112 in the same column are controlled by the same control signal. Specifically, counting from bottom to top in FIG. 5, the touch electrodes SE in the odd-numbered columns are coupled to the touch control signal line TL1, and the control terminal of the inductive switch 112 connected to it is coupled to the first control line CL1, which is controlled In the first control signal CS1. The touch electrodes SE of the even-numbered columns are coupled to the touch control signal line TL2, and the control terminal of the sensing switch 112 connected thereto is coupled to the second control line CL2 and controlled by the second control signal CS2. The first control line CL1 and the second control line CL2 are staggered in the row direction. In this embodiment, the first control signal CS1 can be divided into two first control lines CL1, and the second control signal CS2 can be divided into two second control lines CL2. In other embodiments, one control signal can be divided into more than two control lines, which is not limited in the present invention.

The protection signal line PL and the touch electrode SE have a one-to-one relationship. There is at least one contact node N0 between each touch electrode SE and the protection signal line PL (Figure Each touch electrode SE in 5 only displays one contact node N0 as an illustration, but it is not limited). The contact node N0 of each touch electrode SE is coupled to the protection signal line PL through at least one through hole, and the protection signal line PL is coupled to the first end of the protection switch 122 disposed in the lower substrate area DB. The second end of the protection switch 122 is coupled to the protection signal VG. In the same row, the two protection switches 122 coupled to the touch electrodes SE of adjacent columns are controlled by different protection control signals, respectively. For example, the protection switch 122 coupled to the touch electrode SE of the odd-numbered column has its control terminal coupled to the first protection control line PCL1 and controlled by the first protection control signal GC1; it is coupled to the touch electrode SE of the even-numbered column The control terminal of the protection switch 122 is coupled to the second protection control line PCL2 and controlled by the second protection control signal GC2. Here, one protection control signal can be divided into two protection control lines, but the present invention does not limit the number of divisions.

More specifically, the touch electrode SE of this embodiment can directly receive the sensing drive signal from the touch signal line TL after the sensing switch 112 is turned on, and the protection signal VG is transmitted on the protection signal line PL after the protection switch 122 is turned on. Then it is transmitted to the touch electrode SE through the through hole.

Please refer to FIG. 2 again. The driving waveform of FIG. 2 can be applied to the embodiment of FIG. 5. Similarly, for two adjacent touch electrodes SE, when one of them is in the sensing mode (the sensing switch 112 is turned on and the protection switch 122 is turned off) to receive the sensing driving signal, the other is in the non-sensing mode and receiving the protection signal. VG (the sensor switch 112 is turned off, and the protection switch 122 is turned on).

Please refer to FIG. 3 again, the black matrix pattern 300 is also applicable to this embodiment. The touch electrode SE overlaps multiple sub-pixels SPX and corresponds to these sub-pixels The number of SPX and the same number of first switch groups 110 are arranged in the effective area AA. The designer configures a sensor switch 112 on the frame of each sub-pixel SPX corresponding to all the sub-pixels SPX (the reference number 122 of the dashed frame in FIG. 3 may correspond to the sensor switch 112 of the alternative embodiment). The pattern BMA of the black matrix pattern 300 in the lateral direction can be used to cover the sensor switch 112, the first control line CL1, the second control line CL2, and other traces, and the pattern BMT in the longitudinal direction can be used to cover the touch signal line TL and Other wiring, etc. Because the sensor switch 112 is to be covered, the width of the pattern BMT is smaller than that of the pattern BMA.

Please refer to FIG. 4 again, the black matrix pattern 400 is also applicable to the embodiment of FIG. 5. The reference number 122 of the dashed box in FIG. 4 may correspond to the sensor switch 112 of the replacement cost embodiment. The number of switches of the first switch group 110 arranged in the effective area AA may be less than the number of switches of the second switch group 120 arranged outside the effective area AA. The designer can selectively set the sensor switch 112 on the border of part of the sub-pixel SPX according to the color or position of the sub-pixel SPX. In one embodiment, the sensor switches 112 are arranged corresponding to the positions of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and do not correspond to the positions of the sub-pixels SPX. A plurality of green sub-pixels G are arranged. In another embodiment, the sensor switches 112 are configured to correspond to one of the red sub-pixel R and the blue sub-pixel B in the sub-pixels SPX, and do not correspond to the other sub-pixels SPX. Color sub-pixels (for example, blue sub-pixel B and green sub-pixel G or red sub-pixel R and green sub-pixel G) are arranged. In another embodiment, the inductive switches 112 are selectively arranged in the effective area AA evenly and at intervals.

Because the number of inductive switches 112 is reduced, part of the pattern BMA does not need to cover the transistor, and the occupied area is reduced, so the overall aperture ratio can be increased. Please refer to the above description for the specific configuration of the transistor. The protective switch 122 is replaced by the inductive switch 112, and other parts will not be repeated.

6 is a partial schematic diagram of a touch sensing layer of a touch display panel according to another embodiment of the present invention. Please refer to FIG. 6. The structure of FIG. 6 can be applied to the touch sensing layer 102 of the touch display panel 10. The first switch group 110 is arranged in the effective area AA, and the second switch group 120 is arranged in the substrate area outside the effective area AA. This embodiment is similar to the embodiment of FIG. 5, these inductive switches 112 are arranged in the effective area AA corresponding to the position of the touch electrode SE, and the protection switch 122 is also arranged on the substrate 100 on one side of the effective area AA , But the difference is that the protection switch 122 of this embodiment is arranged in the upper substrate area UB above the pixel array, and is not arranged in the lower substrate area DB together with the sensing circuit 106. Each touch electrode SE in FIG. 5 only shows one sensor switch 112 and one contact node N0 as an illustration, but it is not limited. Those with ordinary knowledge in the art can obtain sufficient specific implementation modes, suggestions and teachings from the above-mentioned embodiments, which will not be repeated here.

In summary, the embodiment of the present invention provides a touch display panel including a pixel array, a plurality of touch electrodes, a first switch group and a second switch group, wherein the first switch group and the second switch group are One is arranged in the effective area of the touch display panel, and the other of the first switch group and the second switch group is arranged outside the effective area of the substrate. Thereby, the touch display panel of the present invention can reduce the wiring area of the frame while maintaining the aperture ratio of the display panel. In addition, the present invention can also be modified The residual charge problem of the in-plane transistors of the touch display panel has the same common voltage recovery capability compared with the technology where all the transistor switches are arranged on the glass substrate, which can reduce the circuit area while maintaining the display screen The stability.

106: induction circuit

110: The first switch group

112: Sensor switch

120: The second switch group

122: Protection switch

AA: effective area

CL1: The first control line

CL2: Second control line

CS1: The first control signal

CS2: second control signal

DB: lower substrate area

GC1: The first protection control signal

GC2: The second protection control signal

N: sensor node

N0: contact node

PCL1: The first protection control line

PCL2: The second protection control line

PX: pixel

PL: Protection signal line

P: line P

SE, SE1, SE2: touch electrodes

SPX: Sub-pixel

TL: Touch signal line

VG: Protection signal

Claims (15)

A touch display panel includes: a substrate; a plurality of pixels arranged in an array in an effective area of the substrate; and a touch sensing layer including: a plurality of touch electrodes overlapped with the pixels in an array Arranged in the effective area, wherein the touch electrodes are electrically connected to a plurality of touch signal lines and a plurality of protection signal lines; a first switch group includes a plurality of inductive switches, wherein each of the touch electrodes passes through at least one The inductive switch receives an inductive drive signal from the corresponding touch signal line; and a second switch group includes a plurality of protection switches, wherein each of the touch electrodes receives a protection from the corresponding protection signal line through at least one of the protection switches Signal, wherein one of the first switch group and the second switch group is arranged in the effective area, and the other of the first switch group and the second switch group is arranged in the effective area of the substrate outer. The touch display panel according to claim 1, wherein the first switch group is arranged in a substrate area outside the effective area of the substrate, and each of the protection switches in the second switch group is based on The corresponding position of the touch electrode is arranged in the effective area. According to the touch display panel of claim 2, wherein each of the touch electrodes is coupled to each of the touch signal lines through at least one through hole, and each of the touch electrodes is coupled to each of the touch signal lines through at least one protection switch. Protect the signal line. As for the touch display panel described in claim 1, wherein each of the touch electrodes overlaps a plurality of sub-pixels, and corresponds to the number of the sub-pixels, and the same number of switches are arranged in the effective area The first switch group or the second switch group, and a black matrix pattern of the touch display panel have different pattern widths in a first direction and a second direction. The touch display panel according to claim 1, wherein each touch electrode overlaps a plurality of sub-pixels, and the first switch is correspondingly arranged in the effective area according to the number of some of the sub-pixels The number of switches in one of the group and the second switch group. For the touch display panel described in item 5 of the scope of patent application, the inductive switches or the protection switches are selectively arranged in the effective area according to the colors of the sub-pixels. For the touch display panel described in item 6 of the scope of patent application, the sensor switches or the protection switches correspond to the positions of the red sub-pixels and the blue sub-pixels in the sub-pixels. The configuration does not correspond to multiple green sub-pixels in some sub-pixels. For the touch display panel described in item 6 of the scope of patent application, the inductive switches or the protection switches correspond to the red sub-pixels and the multi- It is configured for one of the colors of the blue sub-pixels, and does not correspond to the sub-pixels of other colors in the sub-pixels. For the touch display panel described in item 5 of the scope of patent application, the inductive switches or the protection switches are selectively arranged in the effective area, so that the inductive switches or the protection switches appear in the effective area Spaced regularly. The touch display panel according to claim 1, wherein the number of switches of the first switch group or the second switch group arranged in the effective area is less than or equal to the number of switches arranged outside the effective area The number of switches in the second switch group or the first switch group. The touch display panel according to claim 10, wherein the switches of the first switch group and the second switch group are a plurality of transistors, and the channel lengths of the transistors are the same, and they are arranged in the The total channel width of the transistors of the first switch group or the second switch group outside the effective area is Wt, and the number is A1, and the second switch group or the first switch group arranged in the effective area The channel width of these transistors is W2, so the number is less than or equal to A1 and greater than or equal to 0.05*Wt/W2. The touch display panel according to claim 1, wherein the second switch group is disposed in a substrate area outside the effective area of the substrate, and each of the inductive switches in the first switch group is based on The corresponding position of the touch electrode is arranged in the effective area. The touch display panel according to claim 12, wherein each touch electrode is coupled to each touch signal line through at least one inductive switch, and each touch electrode is coupled to each of the touch signal lines through at least one through hole Protect the signal line. In the touch display panel described in claim 12, the second switch group and a sensing circuit are arranged on the same side outside the effective area, and the sensing circuit is used to provide the sensing driving signal. The touch display panel according to claim 12, wherein the second switch group and a sensing circuit are arranged on two opposite sides outside the effective area, and the sensing circuit is used to provide the sensing driving signal.

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