CN111580696A

CN111580696A - Touch control display panel

Info

Publication number: CN111580696A
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: 2020-08-25
Anticipated expiration: 2040-05-08
Also published as: TW202125180A; TWI708177B; CN111580696B

Abstract

The invention provides a touch display panel, which comprises a substrate, a plurality of pixels and a plurality of touch electrodes positioned in an effective area, and a first switch group and a second switch group. The touch control electrodes are overlapped with the pixels, wherein the touch control electrodes are electrically connected with a plurality of touch control signal lines and a plurality of protection signal lines. The first switch group comprises a plurality of induction switches, wherein each touch electrode receives an induction driving signal from a corresponding touch signal line through at least one induction 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.

Description

Touch control display panel

Technical Field

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

Background

With the development of technology, touch display devices are widely used in daily life because they have the advantage of friendly human-computer interface, wherein capacitive touch technology is used to determine the position of a touch point by reflecting the capacitance change caused by a touch object (e.g. a finger or a stylus pen). Touch display panels can be generally classified into an in-cell (in-cell) type and an in-cell (out-cell) type. The in-cell touch display panel has the advantages of thin thickness and light weight, however, the touch display panel needs to consider the structure of the display module and the layout of the touch sensing transmission lines and shield the transmission lines in design. 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 reduce the panel size becomes an important issue.

Disclosure of Invention

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.

In order to achieve the above object, 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 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 induction switches, wherein each touch electrode receives an induction driving signal from a corresponding touch signal line through at least one induction 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: in the touch display panel of the embodiment of the invention, the inductive switch or the protection switch is arranged in the effective area, and the protection switch or the inductive switch is arranged outside the effective area. Thereby reducing the circuit layout area outside the effective area and maintaining the aperture ratio of the display panel, and simultaneously maintaining the quality of the display picture.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited 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 partial area diagram 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 partial schematic view of a touch sensing layer of a touch display panel according to another embodiment of the invention.

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

Wherein, the reference numbers:

10: touch control display panel

100: substrate

102: touch control induction layer

104: induction circuit

106: induction circuit

110: a first switch group

112: induction switch

120: second switch group

122: protective switch

300. 400: black matrix pattern

AA: effective area

BMT, BMA: pattern(s)

CL 1: first control line

CL 2: second control line

CS 1: a first control signal

CS 2: the second control signal

DB: lower substrate region

DISP: during the display period

TL, TL1, TL 2: touch signal line

UB: upper substrate region

VCOM: common voltage

GC 1: a first protection control signal

GC 2: a second protection control signal

N: induction node

N0: contact node

R: red sub-pixel

G: green sub-pixel

B: blue sub-pixel

PCL 1: first protection control line

PCL 2: second protection control line

PX: pixel

PL: protection signal line

P: column P

SE, SE1, SE 2: touch electrode

SPX: sub-pixel

TOUCH: during touch control

TOU 1: the first period

TOU 2: the second period

TP: sensing a drive signal

VG: protection signal

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

fig. 1A is a schematic top view and fig. 1B is a schematic partial area view of a touch display panel according to an embodiment of the invention. Referring to fig. 1A, a touch display panel 10 is, for example, an in-cell touch panel, and a touch sensor is directly integrated on a 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 line 104, and a sensing circuit 106, and the touch electrodes SE are electrically connected to the sensing circuit 106 through the sensing line 104.

The pixels PX are arrayed in an Active Area (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 to the pixel electrode, the second end of the active element is electrically connected to the data line for receiving the display signal, and the control end of the active element is electrically connected to the scan line for turning on the switch according to the scan signal to drive the pixel PX.

The touch electrodes SE are overlapped with the pixels PX and arranged in the active area AA of the substrate 100 in the same array. Here, the touch display panel 10 is exemplified by a capacitive touch panel of an 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 with 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 can be used as a schematic diagram of the touch sensing layer 102 of the touch display panel 10, and structures of the pixel array, the data line, and the 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, so that the touch electrode SE in a sensing state receives a sensing driving signal. Each touch electrode SE receives a sensing driving signal from the 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 (protecting signal) from the touch electrode in a non-sensing state. Each touch electrode SE receives a protection signal from the 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.

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 at one side of the effective area AA, and each of the protection switches 122 is disposed in the effective 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 effective area AA together with the sensing circuit 106.

In the present embodiment, the touch signal lines TL and the touch electrodes SE have a one-to-one relationship. The touch electrodes SE in 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 only shows 2 sensing nodes N for illustration, but not for limitation. 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 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 and then transmitted to the corresponding touch electrode SE through the via hole (via) to detect the capacitance change at the sensing node N, thereby determining the occurrence position of the touch event.

Specifically, two touch electrodes SE in adjacent rows in the same column can receive the same sensing driving signal, but the sensing switches 112 connected thereto are controlled by different control signals, such as the first control signal CS1 and the second control signal CS 2. For example, the control end 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 end 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 CS 2. In other words, the sensing switches 112 connected to two adjacent touch signal lines TL form a one-to-two multiplexer, so that the same sensing driving signal can be transmitted to two different touch electrodes SE. However, the present invention is not limited thereto, and in other embodiments, the plurality of inductive switches 112 may be combined into a pair-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, the touch electrodes SE in different rows are not electrically connected to different protection signal lines PL. In this embodiment, the touch electrode SE may not be coupled to the protection signal line PL through a via hole, but coupled to the protection signal line PL through the protection switch 122. The protection switch 122 has one end coupled to the contact node N0 of the touch electrode SE and the other end coupled to the protection signal line PL to control whether the touch electrode SE receives a protection signal.

The control terminals of the protection switches 122 connected to two touch electrodes SE located in adjacent rows in the same column are respectively controlled by different protection control signals, such as the first protection control signal GC1 and the second protection control signal GC2, 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 switch 122 connected to the touch electrode SE of the odd-numbered row 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 electrode SE of the even-numbered row is coupled to the second protection control line PCL2 to be controlled by the second protection control signal GC 2.

In this embodiment, the same protection control signal may also be divided to control a plurality of protection switches 122, 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 can be applied to the embodiments of fig. 1A and 1B, and the two adjacent touch electrodes SE1 and SE2 in the pth row in 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 thereto is coupled to the first protection control line PCL1 and controlled by the first protection control signal GC 1. 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 GC 2.

When the touch display panel 10 is in the display period DISP, the common voltage VCOM is applied to both the touch electrodes SE1 and SE 2. When the TOUCH display panel 10 is in the TOUCH period TOUCH, in the first period TOU1, the first control signal CS1 is in an enable (enable) state, and the first protection control signal GC1 is in a disable (disable) state, the inductive 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 inductive 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, and 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 disable state and the first protection control signal GC1 is in the enable state, the inductive switch 112 of the touch electrode SE1 is turned off and the protection switch 122 is turned on. The touch electrode SE1 is in the 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 line 104. As shown in fig. 2, the protection signal VG and the sensing driving signal TP may have the same waveform to reduce the 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 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 of fig. 3 is merely illustrative and is not intended to limit the present invention.

In the present embodiment, the same number of protection switches 122 are arranged in each touch electrode SE corresponding to the number of the sub-pixels SPX. That is, each protection switch 122 in the touch electrode SE is configured corresponding to one sub-pixel SPX. The black matrix pattern 300 may not have the same pattern width in the first direction and 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 traces. The pattern BMT of the longitudinal direction (second direction) may be used to cover the guard signal line PL and other wirings. Since the first switch group 110 is disposed outside the effective area AA, the black matrix pattern 300 only needs to cover the protection switch 122 with a large area in the transverse direction, and only needs to cover the trace with a small area in the longitudinal direction, so the pattern BMT can be thinner than the pattern BMA.

In the present embodiment, the number of the sub-pixels SPX is equal to the number of the protection switches 122, and the number of the protection switches 122 is also the same as the number of the sensing switches 112. However, in other embodiments, the touch display panel 10 may only correspond to the number of the sub-pixels SPX to correspond to the number of the protection switches 122. That is, the number of the sub-pixels SPX and the number of the sensing switches 112 are greater than the number of the 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 inside the effective area AA.

For example, the protection switches 122 are selectively disposed in the active area AA according to the color of the sub-pixel SPX. In one embodiment, the protection switches 122 are disposed corresponding to positions of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and are not disposed corresponding to the green sub-pixels G in the sub-pixels SPX. The designer preferably selects to dispose the protection switch 122 at the edge of the red sub-pixel R and the blue sub-pixel B, and not to dispose 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 colors 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 sub-pixel R and ignores 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 and ignore the red sub-pixel R and the green sub-pixel G. The present invention does not impose any limitation on the color selection of the sub-pixel 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 sub-pixels SPX to configure the protection switches 122 such that the protection switches 122 are evenly distributed within the active area AA.

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

In one embodiment, the protection switch 122 and the sensing switch 112 are transistors, the channel length L of each transistor is the same, 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 in the effective area AA is referred to as W2, and the total number of sub-pixels SPX or the number of transistors of a switch group disposed outside the effective area AA is referred to as a 1. 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 effective area AA. The transistor sizes of the protection switch 122 and the sensing switch 112 may be different, but here, the channel length L of each protection switch 122 and each sensing 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 protection 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 total channel width Wt of all the sensing switches 112 is 400 μm. The number of protection switches 122 disposed in the active area AA may be up to 400, and may be 4 at minimum.

In the present embodiment, the first switch group 110 or the second switch group 120 has a reference ratio X, where X is the total channel width of all transistors in the switch group and/or the channel width of a single transistor. The reference ratio X1, X1 ═ a1 × W1/L1 corresponding to 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 corresponding to the second switch group 120 in the active area AA falls within a range from a 1W 2/L2 to 0.05X 1, wherein 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 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 to 20 micrometers, for example, 8 micrometers, and the channel width W2 is 5 micrometers. The first switch group 110 has 400 inductive switches 112 disposed in the lower substrate area DB, so that the total channel width Wt of all the inductive switches 112 is also 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 a range of a1 × W2/L2 to 0.05 × X1, so 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 subpixels SPX of three colors of red, blue and green are alternately arranged along the horizontal direction, and the designer selects to configure the protection switches 122 only for the blue subpixel B in the horizontal direction, and configures the protection switches 122 at uniform intervals in the vertical direction. In the embodiment, since the number of the protection switches 122 in the active area AA is reduced, only a portion of the pattern BMA needs to be widened, and only a portion of the pattern BMA needs to cover the traces, so that only a smaller area is required, thereby achieving the effects of reducing the number of used components and maintaining the aperture ratio.

Fig. 5 is a partial 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 can be applied to the touch sensing layer 102 of the touch display panel 10. In the 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 effective area AA corresponding to the position of the touch electrode SE, and the protection switches 122 are disposed on the substrate 100 on one side of the effective area AA. In fig. 5, the sensing circuit 106 is disposed in the lower substrate area DB below the effective area AA together with the second switch group 120. Each touch electrode SE may be configured with one or more sensing switches 112 coupled to the touch signal line TL. In fig. 5, only one inductive switch 112 is shown for each touch electrode SE as an illustration.

In the present embodiment, the touch signal lines TL and the touch electrodes SE are not in a one-to-one relationship. The touch electrodes SE in 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 row are controlled by the same control signal. Specifically, as shown from bottom to top in fig. 5, the odd-numbered touch electrodes SE are coupled to the touch signal line TL1, and the control end of the connected sensing switch 112 is coupled to the first control line CL1 and controlled by the first control signal CS 1. The even-numbered rows of touch electrodes SE are coupled to the touch signal line TL2, and the control end of the connected sense switch 112 is coupled to the second control line CL2 controlled by the second control signal CS 2. The first control line CL1 and the second control line CL2 are alternately arranged in the column direction. In the present embodiment, the first control signal CS1 may be divided and applied to 2 first control lines CL1, and the second control signal CS2 may be divided and applied to 2 second control lines CL 2. In other embodiments, a control signal may be divided into more than 2 control lines, and the invention is not limited thereto.

The protection signal lines PL and the touch electrodes SE have a one-to-one relationship. Each touch electrode SE has at least one contact node N0 between it and the protection signal line PL (only one contact node N0 is shown in fig. 5 for illustration, but not limitation). The contact node N0 of each touch electrode SE is coupled to a protection signal line PL through at least one via, and the protection signal line PL is coupled to a first end of the protection switch 122 disposed in the lower substrate area DB. The 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 terminal of the protection switch 122 coupled to the touch electrode SE of the odd-numbered row is coupled to the first protection control line PCL1 and controlled by the first protection control signal GC 1; the control terminal of the protection switch 122 coupled to the even-numbered touch electrode SE is coupled to the second protection control line PCL2 and controlled by a second protection control signal GC 2. Here, one protection control signal may be divided to be supplied to 2 protection control lines, but the present invention does not limit the number of divided parts.

More specifically, the touch electrode SE of the embodiment can directly receive the sensing driving 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, and then transmitted to the touch electrode SE through the through hole.

Referring again to fig. 2, the driving waveforms of fig. 2 can be applied to the embodiment of fig. 5. Similarly, for two adjacent touch electrodes SE, when one of the two touch electrodes SE 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 touch electrode SE 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 to fig. 3 again, the black matrix pattern 300 is also applicable to the present embodiment. The touch electrode SE overlaps the plurality of sub-pixels SPX, and the first switch group 110 having the same number of switches is disposed in the active area AA corresponding to the number of the sub-pixels SPX. The designer configures an inductive switch 112 on the frame of each sub-pixel SPX corresponding to all sub-pixels SPX (the reference numeral 122 of the dashed frame in fig. 3 can be replaced by the inductive switch 112 of the present embodiment). The pattern BMA of the black matrix pattern 300 in the transverse direction may be used to cover the sensing switches 112, the first control lines CL1, the second control lines CL2, other traces, etc., and the pattern BMT in the longitudinal direction may be used to cover the touch signal lines TL, other traces, etc. The width of the pattern BMT is thinner than the pattern BMA due to the need to cover the inductive switch 112.

Referring to fig. 4 again, the black matrix pattern 400 can be applied to the embodiment of fig. 5. The reference numeral 122 of the dotted frame of fig. 4 may be replaced with the inductive switch 112 of the present embodiment. The number of switches of the first switch group 110 disposed in the effective area AA may be smaller than the number of switches of the second switch group 120 disposed outside the effective area AA. The designer may selectively set the sensing switches 112 at the borders of the sub-pixels SPX according to the color or position of the sub-pixels SPX. In one embodiment, the sensing switches 112 are disposed corresponding to positions of the red sub-pixels R and the blue sub-pixels B in the sub-pixels SPX, and are not disposed corresponding to the green sub-pixels G in the sub-pixels SPX. In another embodiment, the sensing switches 112 are configured corresponding to one color of the red sub-pixel R and the blue sub-pixel B in the sub-pixels SPX, and are not configured corresponding to other color sub-pixels (e.g., the blue sub-pixel B and the green sub-pixel G or the red sub-pixel R and the green sub-pixel G) in the sub-pixels SPX. In another embodiment, the inductive switches 112 are selectively configured to be uniformly and intermittently distributed in the active area AA.

Since the number of the sensing switches 112 is decreased, a portion of the pattern BMA does not need to cover the transistors, and the occupied area is decreased, thereby increasing the entire aperture ratio. For the specific configuration of the transistors, please refer to the above description, and the inductive switch 112 is used to replace the protection switch 122, which will not be described in detail.

Fig. 6 is a partial 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 can be applied 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 a substrate area outside the active area AA. Similar to the embodiment of fig. 5, the sensing switches 112 are disposed in the effective area AA corresponding to the position of the touch electrode SE, and the protection switch 122 is also disposed on the substrate 100 on one side of the effective area AA, but the difference is that the protection switch 122 of the 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 for illustration, but not limitation.

In summary, the embodiments of the invention provide a touch display panel, which includes 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 keep the aperture opening ratio of the display panel. In addition, the invention can also 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, and can maintain the stability of the display screen while reducing the circuit area.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one 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 in an array manner; and

a touch sensing layer, comprising:

a plurality of touch electrodes overlapped with the pixels and arranged in the effective area in an array manner, wherein the touch electrodes are electrically connected with a plurality of touch signal lines and a plurality of protection signal lines;

a first switch group including a plurality of inductive switches, wherein each of the touch electrodes receives an inductive driving signal from a corresponding touch signal line through at least one of the inductive switches; and

a second switch group including 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 a position of the corresponding touch electrode.

3. The touch display panel according to 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 of the protection switches.

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

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

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

7. The touch display panel of claim 6, wherein the sensing switches or the protection switches are disposed corresponding to positions of red sub-pixels and blue sub-pixels of the sub-pixels and not corresponding to green sub-pixels of the 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 configured to be uniformly distributed in the active area.

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

11. The touch display panel of claim 10, wherein the switches of the first switch group and the second switch group are transistors having the same channel length, the sum of the channel widths of the transistors of the first switch group or the second switch group disposed outside the active region is Wt and is a1, and the channel widths of the transistors of the second switch group or the first switch group disposed inside the active region is W2, which 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 according to 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 and a sensing circuit are disposed on the same side of the active area, wherein the sensing circuit is configured to provide the sensing driving signal.

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