CN111580696B

CN111580696B - Touch display panel

Info

Publication number: CN111580696B
Application number: CN202010382583.4A
Authority: CN
Inventors: 李家圻; 徐嘉均; 陈政德
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2019-12-19
Filing date: 2020-05-08
Publication date: 2023-05-05
Anticipated expiration: 2040-05-08
Also published as: CN111580696A; TW202125180A; TWI708177B

Abstract

The invention provides a touch display panel, which comprises a substrate, a plurality of pixels and a plurality of touch electrodes which are positioned in an effective area, and a first switch group and a second switch group. The touch electrodes are overlapped with the pixels, wherein the touch electrodes are electrically connected with a plurality of touch signal lines and a plurality of protection signal lines. The first switch group comprises 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 comprises 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. One of the first switch group and the second switch group is arranged in the effective area, and the other one of the first switch group and the second switch group is arranged outside the effective area of the substrate.

Description

Touch display panel

Technical Field

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

Background

Along with the development of technology, touch display devices are widely used in daily life because of the advantage of friendly man-machine interface, wherein capacitive touch technology determines the position of a touch point by reflecting the capacitance change caused by a touch object (such as a finger or a stylus). Touch display panels can be generally divided into two types, external-mounted and embedded (in-cell). The embedded touch display panel has the advantages of thinner thickness and lighter weight, however, the touch display panel needs to consider the structure of the display module and the layout of the touch sensing transmission lines at the same time in design, and shield the transmission lines. The design of the inductive transmission line may affect the quality of the display or occupy the frame area of the panel. Therefore, how to ensure the quality of the display screen and to reduce the size of the panel becomes an important issue.

Disclosure of Invention

The 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.

In order to achieve the above objective, the present invention provides a touch display panel, which includes a substrate, a plurality of pixels, and a touch sensing layer. The pixel arrays are arranged in the effective area of the substrate. The touch sensing layer comprises a plurality of touch electrodes, a first switch group and a second switch group. The touch electrodes are overlapped with the pixels and are arranged in the effective area in an array mode, wherein the touch electrodes are electrically connected with a plurality of touch signal lines and a plurality of protection signal lines. The first switch group comprises 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 comprises 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, 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 outside the effective area of the substrate.

The invention has the beneficial effects that: the touch display panel of the embodiment of the invention is provided with the induction switch or the protection switch in the effective area, and is provided with the protection switch or the induction switch outside the effective area. Therefore, the circuit layout area outside the effective area is reduced, the aperture ratio of the display panel is maintained, and the display picture quality is maintained.

The invention will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.

Drawings

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

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

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

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

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

Fig. 5 is a schematic view of a touch sensing layer of a touch display panel according to another embodiment of the invention.

Fig. 6 is a schematic view of a touch sensing layer of a touch display panel according to another embodiment of the invention.

Wherein, the reference numerals:

10: touch display panel

100: substrate board

102: touch sensing layer

104: induction circuit

106: induction circuit

110: first switch group

112: inductive switch

120: second switch group

122: protective switch

300. 400: black matrix pattern

AA: effective area

BMT, BMA: pattern and method for producing the same

CL1: first control line

CL2: second control line

CS1: first control signal

CS2: second control signal

DB: lower substrate region

DISP: display period

TL, TL1, TL2: touch signal line

UB: upper substrate region

VCOM: common voltage

GC1: first protection control signal

GC2: second protection control signal

N: sensing node

N0: contact node

R: red sub-pixel

G: green sub-pixel

B: blue sub-pixel

PCL1: first protection control line

PCL2: second protection control line

PX: pixel arrangement

PL: protection signal line

P: column P

SE, SE1, SE2: touch electrode

SPX: sub-pixel

TOUCH: touch control period

TOU1: during a first period

TOU2: second period

TP: inductive drive signal

VG: protecting signals

Detailed Description

The structural and operational principles of the present invention are described in detail below with reference to the accompanying drawings:

fig. 1A is a schematic top view of a touch display panel according to an embodiment of the invention, and fig. 1B is a schematic partial area of a touch display panel according to an embodiment of the invention. Referring to fig. 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 at least includes a substrate 100, a plurality of pixels PX and a touch sensing layer 102, wherein the touch sensing layer 102 at least includes a plurality of touch electrodes SE, a sensing circuit 104 and a sensing circuit 106, and the touch electrodes SE are electrically connected to the sensing circuit 106 through the sensing circuit 104.

The pixel PX arrays are arranged in an Active Area (AA) of the substrate 100 to form a pixel array. Each pixel PX includes a pixel electrode and an active device. The active element is, for example, a transistor switch. The first end of the active element is electrically connected with the pixel electrode, the second end of the active element is electrically connected with the data line to receive the display signal, and the control end of the active element is electrically connected with the scanning line to conduct the switch according to the scanning signal to drive the pixel PX.

The touch electrodes SE overlap the pixels PX and are arranged in the same array in the active area AA of the substrate 100. Here, the touch display panel 10 is exemplified by a capacitive touch panel with in-cell architecture, the touch sensing layer 102 can be integrated in the internal structure of the display panel, the substrate 100 is shared, and the single touch electrode SE is overlapped on the plurality of pixels PX. The numbers of the pixels PX and the touch electrodes SE in fig. 1A are only for illustration, and are not intended to limit the present invention.

Referring to fig. 1B, the structure of fig. 1B may be used as a schematic diagram of the touch sensing layer 102 of the touch display panel 10, and structures such as a pixel array, a data line, and a scan line of the touch display panel 10 are omitted. In fig. 1B, the 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 in fig. 1A includes at least one of the touch signal lines TL and the protection signal lines PL.

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 enabling the touch electrode SE in a sensing state to receive a sensing driving signal. 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 receiving a protection signal (guard signal) from the touch electrode in the non-sensing state. Each touch electrode SE receives a protection signal from a corresponding protection signal line PL through at least one protection switch 122. The inductive switch 112 or the protection switch 122 is, for example, a transistor. The switches of the following embodiments are implemented as NMOS transistors, but are not limited thereto.

It should be noted that one of the first switch group 110 and the second switch group 120 is disposed in the active area AA, and the other of the first switch group 110 and the second switch group 120 is disposed outside the active area AA of the substrate 100.

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

In this embodiment, the touch signal lines TL and the touch electrodes SE have a one-to-one relationship. The touch electrodes SE of different rows in the same column are coupled to different touch signal lines TL. In addition, one touch electrode SE may have one or more sensing nodes N thereon. The touch electrode SE of fig. 1B shows only 2 sensing nodes N as an illustration, but is not limited thereto. 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 (via), and are further coupled to a first end of the sensing switch 112, and a second end of the sensing switch 112 is coupled to the sensing circuit 106. When the sensing switch 112 is turned on, the sensing driving signal is transmitted from the sensing circuit 106 through the sensing switch 112 on the touch signal line TL, and then transmitted to the corresponding touch electrode SE through the via hole (via) to detect the capacitance change on the sensing node N, thereby determining the occurrence position of the touch event.

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

The touch electrodes SE of the same column are commonly connected to the same protection signal line PL. That is, the touch electrodes SE of different rows are electrically connected to different protection signal lines PL. In the present embodiment, the touch electrode SE may be coupled to the protection signal line PL through the protection switch 122 instead of the protection signal line PL through a via hole. One end of the protection switch 122 is coupled to the contact node N0 of the touch 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 ends of the protection switches 122 connected to the two touch electrodes SE 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, respectively, but the protection switches 122 connected to the touch electrodes SE in the same row are controlled by the same protection control signal. For example, the protection switches 122 connected to the touch electrodes SE of the odd rows are coupled to the first protection control line PCL1 to be controlled by the first protection control signal GC1, and the protection switches 122 connected to the touch electrodes SE of the even rows are coupled to the second protection control line PCL2 to be controlled by the second protection control signal GC2.

In this embodiment, the same protection control signal may be used to control a plurality of protection switches 122 separately, and is not limited to 2.

Fig. 2 is a signal waveform diagram of a touch display panel according to an embodiment of the invention. The waveform diagram of fig. 2 is applicable to the embodiments of fig. 1A and 1B, and two adjacent touch electrodes SE1, SE2 in the P-th column of fig. 1B are taken as an example for illustration. Touch electrode SE1 is located in row 3 (from bottom to top) of column P, and touch electrode SE2 is located in row 4 of column P. 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 to the sensing switch 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 to the sensing switch 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 common voltage VCOM is applied to both the touch electrode SE1 and the touch electrode SE 2. When the TOUCH display panel 10 is in the TOUCH period TOU1, the first control signal CS1 is in an enable (disable) state, and the first protection control signal GC1 is in a disable (disable) state, the sensing switch 112 of the TOUCH 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 driving signal TP. In contrast, the second control signal CS2 is in the disabled state, and the second protection control signal GC2 is in the 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 avoid the potential of the touch electrode SE2 in the non-sensing mode being in a floating (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 an enabled state, the second protection control signal GC2 is in a disabled state, and the touch electrode SE2 is in a sensing mode to receive the sensing driving signal TP.

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

Fig. 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 (Black Matrix) pattern 300 may be applied to the touch display panel 10 of the above-described embodiment. In fig. 3, one touch electrode SE may overlap a plurality of sub-pixels SPX, wherein the sub-pixels SPX include a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B. The plurality of sub-pixels SPX may constitute one 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 illustrative and is not intended to limit the present invention.

In the present embodiment, the same number of protection switches 122 is configured in each touch electrode SE corresponding to the number of the sub-pixels SPX. That is, each of the protection switches 122 in the touch electrode SE is configured corresponding to one sub-pixel SPX. The black matrix pattern 300 may be different in pattern width in the first direction from that in the second direction.

The pattern BMA of the black matrix pattern 300 in the lateral direction (first direction) may be used to cover the protection switch 122, the first protection control line PCL1, the second protection control line PCL2, and other wirings. The pattern BMT in the longitudinal direction (second direction) may be used to cover the protection signal line PL and other wirings. Since the first switch group 110 is disposed outside the active area AA, the black matrix pattern 300 only needs to cover the protection switch 122 with a larger area in the lateral direction, and only needs to cover the trace with a smaller area in the longitudinal direction, so the pattern BMT may be thinner than the pattern BMA.

In the present embodiment, 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 sensing switches 112. However, in other embodiments, the touch display panel 10 may also be configured with the number of switches of the protection switch 122 corresponding to only the number of sub-pixels SPX. That is, the number of sub-pixels SPX and the number of sensing switches 112 are greater than the number of protection switches 122. In the present invention, the number of the plurality of switches of the first switch group 110 or the second switch group 120 disposed outside the effective area AA may be smaller than the number of the plurality of switches of the second switch group 120 or the first switch group 110 disposed within the effective area AA.

For example, the protection switches 122 are selectively arranged in the effective area AA according to the color of the sub-pixel SPX. In one embodiment, the protection switches 122 are configured corresponding to the positions of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and are not configured corresponding to the green sub-pixels G in the sub-pixels SPX. The designer prefers to arrange the protection switch 122 corresponding to the edges of the red sub-pixel R and the blue sub-pixel B, and not arrange the protection switch 122 at the edge of the green sub-pixel G. In another embodiment, the protection switches 122 are configured corresponding to one of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and are not configured corresponding to the sub-pixels of the other colors in the sub-pixels SPX. The designer chooses to configure the protection switch 122 for the edge of the red subpixel R, while ignoring the blue subpixel B and the green subpixel G. In another embodiment, the designer chooses to configure the protection switch 122 for the blue subpixel B, and ignores the red subpixel R and the green subpixel G. The invention is not limited to the color selection of the sub-pixels SPX.

In other embodiments, the designer may also selectively configure the protection switch 122 according to the position of the sub-pixel SPX. In another embodiment, the designer selects a portion of the subpixels SPX to configure the protection switches 122 such that these protection switches 122 are uniformly distributed within the active area AA.

In one embodiment, the number of transistor switches (one of the protection switch 122 and the sensing switch 112) disposed in the active area AA is different from the number of transistor switches (the other of the protection switch 122 and the sensing switch 112) disposed outside the active area AA.

In one embodiment, the protection switch 122 and the sensing switch 112 are transistors and each transistor has the same channel length L, and the channel width of a single transistor disposed outside the active area AA is referred to as W1, and the sum of the channel widths of all the transistors in the switch group is Wt. The channel width of a single transistor disposed within the active area AA is referred to as W2, and the total number of sub-pixels SPX or the number of transistors of the switch group disposed outside the active area AA is referred to as A1. Under the condition that each protection switch 122 and each sensing switch 112 have the same channel length L, the total number of transistors of the switch group disposed in the active area AA is less than or equal to A1 and greater than or equal to 0.05×wt/W2.

In one embodiment, the first switch group 110 is disposed in the lower substrate area DB, and the second switch group 120 is disposed in the active area AA. The transistor dimensions of the protection switch 122 and the sense switches 112 may be different, but here the channel length L of each protection switch 122 and each sense switch 112 is 4 micrometers (μm). The channel width W1 of the inductive switch 112 is 1 micron and the channel width W2 of the protective switch 122 is 5 microns. The touch display panel 10 has 400 sub-pixels SPX, and the first switch group 110 has the same number (400) of sensing switches 112 disposed in the lower substrate area DB corresponding to the total number of the sub-pixels SPX, so that the sum Wt of channel widths of all the sensing switches 112 is 400 μm. The number of the protection switches 122 disposed in the active area AA may be up to 400, and may be 4 at the minimum.

In the present 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 the transistors of the switch group/the channel width of a single transistor. The reference ratio X1, x1=a1×w1/L1 of the first switch group 110 outside the effective area AA, where L1 is the channel length of the inductive switch 112. The reference ratio X2 of the second switch group 120 in the corresponding active area AA falls within a range of A1X W2/L2 to 0.05X 1, 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 active area AA. The channel length L1 of the inductive switch 112 is 4 microns and the channel width W1 is 1 micron. The channel length L2 of the protection switch 122 is, for example, in the range of 2 micrometers to 20 micrometers, for example, 8 micrometers, and the channel width W2 is 5 micrometers. The first switch group 110 has 400 switches 112 disposed in the lower substrate area DB, so that the sum of channel widths Wt of all switches 112 is 400 μm. The reference ratio X1 of the first switch group 110 is 400/4, and the reference ratio X2 of the second switch group 120 falls within the range of a1×w2/L2 to 0.05×x1, so that the number of the protection switches 122 is greater than or equal to 8 and less than or equal to 400.

Fig. 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 may be applied to the touch display panel 10 of the above embodiment. In the present embodiment, the sub-pixels SPX of three colors of red, blue and green are alternately arranged in the horizontal direction, and the designer selects to configure the protection switch 122 only for the blue sub-pixel B in the horizontal direction, and configures the protection switch 122 at uniform intervals in the vertical direction. In the present embodiment, since the number of the protection switches 122 in the active area AA is reduced, only part of the pattern BMA needs to be widened, and only part of the pattern BMA needs to cover the wiring, so that only a smaller area is required, thereby achieving the effects of reducing the number of used elements and maintaining the aperture ratio.

Fig. 5 is a schematic view of a touch sensing layer of a touch display panel according to another embodiment of the invention. Referring to fig. 5, the structure of fig. 5 is applicable to the touch sensing layer 102 of the touch display panel 10. In the present embodiment, the first switch group 110 is disposed in the active area AA, and the second switch group 120 is disposed in the substrate area outside the active area AA. More specifically, in the present embodiment, each of the sensing switches 112 is disposed in the active area AA corresponding to the position of the touch electrode SE, and the protection switches 122 are disposed on the substrate 100 at one side of the active area AA. In fig. 5, the sensing circuit 106 is disposed in the lower substrate area DB below the active area AA together with the second switch group 120. Each touch electrode SE may be configured with one or more inductive switches 112 coupled to the touch signal line TL. Only one sense switch 112 is shown for each touch electrode SE in fig. 5 as an illustration.

In the present embodiment, the touch signal line TL and the touch electrode SE are not in one-to-one relationship. The touch electrodes SE of the same row may be coupled to the same touch signal line TL in a staggered manner, but the sensing switches 112 in the same column are controlled by the same control signal. Specifically, in fig. 5, from bottom to top, the touch electrodes SE of the odd rows are coupled to the touch signal lines TL1, and the control ends of the connected sensing switches 112 are coupled to the first control lines CL1 and controlled by the first control signals CS1. The even-numbered touch electrodes SE are coupled to the touch signal lines TL2, and the control ends of the connected sensing switches 112 are coupled to the second control lines CL2 and controlled by the second control signals CS2. The first control lines CL1 and the second control lines CL2 are staggered in the column direction. In the present embodiment, the first control signal CS1 may be applied to 2 first control lines CL1 in a split manner, and the second control signal CS2 may be applied to 2 second control lines CL2 in a split manner. In other embodiments, one control signal may be split to more than 2 control lines, and the invention is not limited.

The protection signal lines PL have a one-to-one relationship with the touch electrodes SE. At least one contact node N0 is provided between each touch electrode SE and the protection signal line PL (each touch electrode SE in fig. 5 shows only one contact node N0 as an illustration, but not a limitation). The contact node N0 of each touch electrode SE is coupled to a protection signal line PL through at least one via hole, and the protection signal line PL is coupled to a first end of a protection switch 122 disposed in the lower substrate area DB. A second terminal of the protection switch 122 is coupled to the protection signal VG. In the same column, the two protection switches 122 coupled to the touch electrodes SE of the adjacent rows are respectively controlled by different protection control signals. For example, the control end of the protection switch 122 coupled to the touch electrode SE of the odd row is coupled to the first protection control line PCL1 and controlled by the first protection control signal GC1; the control end of the protection switch 122 coupled to the touch electrode SE of the even row is coupled to the second protection control line PCL2 and is controlled by the second protection control signal GC2. Here, one protection control signal may be supplied to 2 protection control lines by division, but the present invention does not limit the number of division.

More specifically, the touch electrode SE of the present embodiment may directly receive the induction driving signal from the touch signal line TL after the induction 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, and then transmitted to the touch electrode SE through the through hole.

Referring again to fig. 2, the driving waveforms of fig. 2 may 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 receives the protection signal VG (the sensing switch 112 is turned off and the protection switch 122 is turned on).

Referring again to fig. 3, the black matrix pattern 300 is equally applicable to the present embodiment. The touch electrode SE overlaps the plurality of sub-pixels SPX, and the first switch groups 110 with the same number of switches are disposed in the active area AA corresponding to the number of the sub-pixels SPX. The designer configures a sensor switch 112 for each sub-pixel SPX frame corresponding to all sub-pixels SPX (reference numeral 122 of the dashed box in fig. 3 may correspond to the sensor switch 112 of the alternative cost embodiment). The black matrix pattern 300 may cover the sensing switch 112, the first control line CL1, the second control line CL2, other traces, etc. in the lateral direction, and the pattern BMT may cover the touch signal line TL, other traces, etc. in the longitudinal direction. The width of the pattern BMT is thinner than the pattern BMA due to the covering of the sensing switch 112.

Referring again to fig. 4, the black matrix pattern 400 is equally applicable to the embodiment of fig. 5. Reference numeral 122 of the dashed box of fig. 4 may correspond to the inductive switch 112 of the alternative cost embodiment. The number of switches of the first switch group 110 disposed in the active area AA may be smaller than the number of switches of the second switch group 120 disposed outside the active area AA. The designer may selectively place the sensing switch 112 at the border of a portion of the sub-pixel SPX according to the color or position of the sub-pixel SPX. In one embodiment, the sensing switches 112 are configured corresponding to the positions of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and are not configured corresponding to the green sub-pixels G in the sub-pixels SPX. In another embodiment, the sensing switches 112 are configured corresponding to one of the red and blue sub-pixels R and B in the sub-pixels SPX, and are not configured corresponding to the other color sub-pixels (e.g., the blue and green sub-pixels B and G or the red and green sub-pixels R and G) in the sub-pixels SPX. In another embodiment, the inductive switches 112 are selectively arranged in the active area AA uniformly and at intervals.

Since the number of the sensing switches 112 is reduced, a portion of the pattern BMA does not need to cover the transistor, the occupied area is reduced, and thus the overall aperture ratio can be increased. The specific configuration of the transistor is shown in the above description, and the inductive switch 112 is used to replace the protection switch 122, and other parts will not be described again.

Fig. 6 is a schematic view of a touch sensing layer of a touch display panel according to another embodiment of the invention. Referring to fig. 6, the structure of fig. 6 is applicable to the touch sensing layer 102 of the touch display panel 10. The first switch group 110 is disposed in the active area AA, and the second switch group 120 is disposed in the substrate area outside the active area AA. In this embodiment, similar to the embodiment of fig. 5, the sensing switches 112 are disposed in the effective area AA corresponding to the positions of the touch electrodes SE, and the protection switch 122 is disposed 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 disposed in the upper substrate area UB above the pixel array and not disposed in the lower substrate area DB together with the sensing circuit 106. In fig. 5, each touch electrode SE only shows one sensing switch 112 and one contact node N0 as an illustration, but not limitation.

In summary, the embodiment of the 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 one of the first switch group and the second switch group is disposed in an active area of the touch display panel, and the other of the first switch group and the second switch group is disposed outside the active area of the substrate. Therefore, the touch display panel can reduce the wiring area of the frame and simultaneously maintain the opening ratio of the display panel. In addition, the invention can improve the residual charge problem of the in-plane transistor of the touch display panel, has the same common voltage recovery capability compared with the technology of arranging all the transistor switches on the glass substrate, reduces the circuit area and simultaneously can maintain the stability of the display picture.

Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A touch display panel, comprising:

a substrate;

a plurality of pixels arranged in an effective area of the substrate; and

a touch sensing layer, comprising:

the plurality of touch electrodes are overlapped with the plurality of pixels and arrayed in the effective area, wherein the plurality of touch electrodes are electrically connected with the plurality of touch signal lines and the plurality of protection signal lines;

the first switch group comprises 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; and

a second switch group comprising 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,

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 outside the effective area of the substrate.

2. The touch display panel of claim 1, wherein the first switch group is disposed in a substrate area outside the active area of the substrate, and each of the protection switches in the second switch group is disposed in the active area according to the position of the corresponding touch electrode.

3. 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 via, and each of the touch electrodes is coupled to each of the protection signal lines through at least one protection switch.

4. The touch display panel of claim 1, wherein each of the touch electrodes overlaps a plurality of sub-pixels, and the first switch group or the second switch group having the same number of switches is disposed in the effective area corresponding to the number of the sub-pixels, and a black matrix pattern of the touch display panel is different from a pattern width in a first direction and a second direction.

5. The touch display panel of claim 1, wherein each of the touch electrodes overlaps a plurality of sub-pixels, and wherein a number of switches of one of the first switch group and the second switch group is correspondingly configured in the effective area according to a number of a portion of the plurality of sub-pixels.

6. The touch display panel of claim 5, wherein the plurality of sensing switches or the plurality of protection switches are selectively arranged in the active area according to colors of the plurality of sub-pixels.

7. The touch display panel of claim 6, wherein the plurality of sensing switches or the plurality of protection switches are configured corresponding to positions of a plurality of red sub-pixels and a plurality of blue sub-pixels in the plurality of sub-pixels and not corresponding to a plurality of green sub-pixels in the plurality of sub-pixels.

8. The touch display panel of claim 6, wherein the plurality of sensing switches or the plurality of protection switches are configured corresponding to one of a plurality of red sub-pixels and a plurality of blue sub-pixels of the plurality of sub-pixels and not corresponding to sub-pixels of other colors of the plurality of sub-pixels.

9. The touch display panel of claim 5, wherein the plurality of sensing switches or the plurality of protection switches are selectively arranged in the active area to be distributed uniformly and at intervals.

10. The touch display panel of claim 1, wherein a number of the plurality of switches of the first switch group or the second switch group disposed in the active area is less than or equal to a number of the plurality of switches of the second switch group or the first switch group disposed outside the active area.

11. The touch display panel of claim 10, wherein the plurality of switches of the first switch group and the second switch group are a plurality of transistors, and the channel lengths of the plurality of transistors are the same, the sum of the channel widths of the plurality of transistors of the first switch group or the second switch group disposed outside the effective area is Wt, and the number is A1, and the channel width of the plurality of transistors of the second switch group or the first switch group disposed inside the effective area is W2, and the number is less than or equal to A1 and greater than or equal to 0.05 Wt/W2.

12. The touch display panel of claim 1, wherein the second switch group is disposed in a substrate area outside the active area of the substrate, and each of the sensing switches in the first switch group is disposed in the active area according to a position of the corresponding touch electrode.

13. The touch display panel of claim 12, wherein each of the touch electrodes is coupled to each of the touch signal lines through at least one of the inductive switches, and each of the touch electrodes is coupled to each of the protection signal lines through at least one of the vias.

14. The touch display panel of claim 12, wherein the second switch group is disposed on the same side of the active area as a sensing circuit for providing the sensing driving signal.

15. The touch display panel of claim 12, wherein the second switch group and a sensing circuit are disposed on opposite sides of the active area, wherein the sensing circuit is configured to provide the sensing driving signal.