阅读说明：本技术 触控显示面板 (Touch control display panel ) 是由 叶政谚 赵广雄 于 2019-04-15 设计创作，主要内容包括：本发明公开了一种触控显示面板,其包含第一栅极线、第二栅极线、第一金属线段和触控感测线。第一栅极线及第二栅极线沿第一方向设置,而第一金属线段沿第二方向设置,其中第一方向与第二方向具有夹角。第一金属线段与第一栅极线和第二栅极线属于同一金属层,第一金属线段位于第一栅极线与第二栅极线之间,且第一金属线段与第一栅极线或第二栅极线电性绝缘。触控感测线位于第一金属线段的上方且通过穿孔电性连接至第一金属线段。本发明可降低触控感测信号的传递延迟失真,进而提升触控感测效能,以及有效避免显示问题的产生。(The invention discloses a touch display panel, which comprises a first gate line, a second gate line, a first metal line segment and a touch sensing line. The first gate line and the second gate line are arranged along a first direction, and the first metal line segment is arranged along a second direction, wherein an included angle is formed between the first direction and the second direction. The first metal line segment, the first gate line and the second gate line belong to the same metal layer, the first metal line segment is located between the first gate line and the second gate line, and the first metal line segment is electrically insulated from the first gate line or the second gate line. The touch sensing line is located above the first metal line segment and electrically connected to the first metal line segment through the through hole. The invention can reduce the transmission delay distortion of the touch sensing signal, thereby improving the touch sensing efficiency and effectively avoiding the display problem.)

1. A touch display panel, comprising:

a first gate line and a second gate line arranged along a first direction;

the first metal line segment is arranged along a second direction, an included angle is formed between the first direction and the second direction, the first metal line segment, the first gate line and the second gate line belong to the same metal layer, the first metal line segment is positioned between the first gate line and the second gate line, and the first metal line segment is electrically insulated from the first gate line or the second gate line; and

and the touch sensing line is positioned above the first metal line segment and is electrically connected to the first metal line segment through at least one first through hole.

2. The touch display panel of claim 1, wherein the touch sense line covers at least part of the first metal line segment in a viewing direction of the touch display panel.

3. The touch display panel of claim 1, further comprising:

and the data lines and the touch sensing lines belong to the same metal layer.

4. The touch display panel of claim 1, further comprising:

and the data line and the first metal line segment belong to the same metal layer.

5. The touch display panel of claim 1, wherein the at least one first through hole is two first through holes, and the two first through holes are respectively located at two ends of the first metal line segment.

6. The touch display panel of claim 1, further comprising:

a third gate line parallel to the first gate line and the second gate line; and

a second metal line segment located between the second gate line and the third gate line, the second metal line segment being electrically insulated from the second gate line or the third gate line;

the touch sensing line is located above the second metal line segment and connected to the second metal line segment through at least one second through hole.

7. The touch display panel of claim 1, further comprising:

the pixel transistor is electrically connected with the first grid line or the second grid line;

the pixel electrode layer is electrically connected with the pixel transistor; and

the common electrode layer is electrically connected to the touch sensing line.

8. The touch display panel of claim 7, wherein the pixel electrode layer is located above the common electrode layer.

9. The touch display panel of claim 7, wherein the common electrode layer is located above the pixel electrode layer.

10. A touch display panel, comprising:

a plurality of signal lines arranged in a first direction;

the metal line segment is arranged along a second direction, an included angle is formed between the first direction and the second direction, the metal line segment and the plurality of signals belong to the same metal layer, the metal line segment is positioned between two adjacent signal lines in the plurality of signal lines, and the metal line segment is electrically insulated from the plurality of signal lines; and

and the touch sensing line is positioned above the metal line segment and is electrically connected to the metal line segment through at least one through hole.

Technical Field

The invention relates to a touch display panel.

Background

With the progress of electronic product production technology, most mobile display devices, such as smart phones and tablet computers, have a touch operation function, so that users can operate the mobile display devices more conveniently. On the other hand, in the current main touch technology for display devices, the in-cell touch technology integrates the fabrication of touch sensing electrodes in the process of manufacturing the display panel, so that it has the advantage of reducing the thickness of the display panel. However, in the design of the in-cell touch display panel, the influence of the transmission delay of the touch sensing signal on the display of the screen needs to be considered. If the transmission delay of the touch sensing signal is too long, the touch sensing is not good, and the display problems such as the cross-striation are generated.

Disclosure of Invention

An objective of the present invention is to provide a touch display panel, which can reduce the transmission delay distortion of touch sensing signals, thereby improving the touch sensing performance and effectively avoiding the display problem.

According to the above object, the present invention provides a touch display panel, which includes a first gate line, a second gate line, a first metal line segment and a touch sensing line. The first gate line and the second gate line are arranged along a first direction, and the first metal line segment is arranged along a second direction, wherein an included angle is formed between the first direction and the second direction. The first metal line segment, the first gate line and the second gate line belong to the same metal layer, the first metal line segment is located between the first gate line and the second gate line, and the first metal line segment is electrically insulated from the first gate line or the second gate line. The touch sensing line is located above the first metal line segment and electrically connected to the first metal line segment through at least one first through hole.

According to an embodiment of the invention, the touch sensing line covers at least part of the first metal line segment in a viewing direction of the touch display panel.

According to another embodiment of the present invention, the touch display panel further includes data lines disposed along the second direction and belonging to the same metal layer as the touch sensing lines.

According to another embodiment of the present invention, the touch display panel further includes a data line disposed along the second direction and belonging to the same metal layer as the first metal line segment.

According to another embodiment of the present invention, a projection distance between the data line and the first metal line segment is about 1 to 4 microns.

According to another embodiment of the present invention, the at least one first through hole is two first through holes, and the first through holes are respectively located at two ends of the first metal line segment.

According to another embodiment of the present invention, the touch display panel further includes a third gate line and a second metal line segment. The third gate line is parallel to the first gate line and the second gate line. The second metal line segment is positioned between the second gate line and the third gate line and is electrically insulated from the second gate line or the third gate line. The touch sensing line is located above the second metal line segment and connected to the second metal line segment through at least one second through hole.

According to another embodiment of the present invention, the touch display panel further includes a pixel transistor, a pixel electrode layer, and a common electrode layer. The pixel transistor is electrically connected to the first gate line or the second gate line, the pixel electrode layer is electrically connected to the pixel transistor, and the common electrode layer is electrically connected to the touch sensing line.

According to another embodiment of the present invention, the pixel electrode layer is located above the common electrode layer.

According to another embodiment of the present invention, the common electrode layer is located above the pixel electrode layer.

According to the aforementioned object, the present invention further provides a touch display panel, which includes a plurality of signal lines, metal line segments and touch sensing lines. The signal lines are arranged along a first direction, and the metal line segments are arranged along a second direction, wherein an included angle is formed between the first direction and the second direction. The metal line segment and the signal lines belong to the same metal layer. The metal line segment is positioned between two adjacent signal lines of the signal lines and is electrically insulated from the signal lines. The touch sensing line is located above the metal line segment and electrically connected to the metal line segment through at least one through hole.

The touch display device has the advantages that the metal line segment electrically connected with the touch sensing line is arranged below the touch sensing line of the touch display panel, so that the impedance of the touch sensing line is reduced, the transmission delay distortion of the touch sensing signal can be reduced, the touch sensing efficiency of the touch display panel is further improved, and the display problems such as cross striation are effectively avoided.

Drawings

For a more complete understanding of the embodiments and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a display device according to some embodiments of the invention;

fig. 2A and 2B are a partial plan view and a partial perspective view of an active area of the touch display panel of fig. 1 according to some embodiments of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A' of the partial schematic diagram shown in FIG. 2A;

fig. 4A to 4E are schematic layout views of stages of manufacturing a touch display panel having an upper pixel electrode structure according to some embodiments of the invention;

fig. 5A to 5E are schematic layout views of stages of manufacturing a touch display panel having an upper pixel electrode structure according to some embodiments of the invention;

FIG. 6 is a partial perspective view illustrating an active area of the touch display panel of FIG. 1 according to another embodiment of the present invention; and

fig. 7 is a partial plan view of an active area of a touch display panel according to another embodiment of the invention.

Detailed Description

Embodiments of the invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable concepts that can be embodied in a wide variety of specific contexts. The embodiments discussed and disclosed are merely illustrative and are not intended to limit the scope of the invention.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions and/or sections, these elements, components, regions and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region and/or section from another element, component, region and/or section.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the claims. The singular forms "a", "an" and "the" are intended to mean "a", "an" and "the" unless the context clearly dictates otherwise. Furthermore, the spatially relative terms are used to describe various orientations of the elements in use or operation and are not intended to be limited to the orientations shown in the figures. Elements may also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted in a similar manner.

Referring to fig. 1, fig. 1 is a schematic view of a touch display device 100 according to some embodiments of the invention. The touch display device 100 includes a touch display panel 110 and a touch driving circuit 120. The touch display panel 110 may be a liquid crystal display panel such as a Twisted Nematic (TN) type, an in-plane switching (IPS) type, an FFS (fringe-field switching) type, or a VA (vertical alignment) type, but is not limited thereto. In addition, the touch display panel 110 has an active area 110A and a peripheral area 110B, the active area 110 has a plurality of pixel units (not shown in fig. 1) and touch sensing pads TP disposed on the substrate S, and the peripheral area 110B has a wiring for respectively providing a gate driving signal, a data driving signal and a touch sensing signal to the pixel units and the touch sensing pads TP, so that the pixel units display corresponding gray scales at specific times and the touch sensing pads perform touch sensing at specific times. In addition, the touch display panel 110 may be an in-cell (in-cell) touch display panel, that is, a common electrode (common electrode) in the touch display panel 110 also serves as a touch sensing pad of the touch display panel 110. The gate driving signal, the data driving signal and the touch sensing signal can be provided by a gate driving circuit (not shown in fig. 1), a data driving circuit (not shown in fig. 1) and a touch sensing circuit 120, respectively.

The touch display panel 110 may be a System On Glass (SOG) panel, that is, the gate driving circuit, the data driving circuit and the touch sensing circuit 120 may be formed on the substrate S of the touch display panel 110. In this way, the electronic devices in the gate driving circuit, the data driving circuit and the touch sensing circuit 120 and the electronic devices in the active region 110A (such as, but not limited to, the thin film transistors, the pixel electrodes, the touch sensing pads TP, etc.) can be fabricated by the same process. As shown in fig. 1, the touch driving circuit 120 is fabricated on the substrate S and electrically connected to the touch sensing line SL through a wiring, and then the touch sensing line SL sends a touch sensing signal to the touch sensing pad TP through the contact P. It should be noted that although fig. 1 shows that the touch driving circuit 120 is disposed at the lower side of the active region 110A, the invention is not limited thereto. The touch driving circuit 120 may also be disposed on the left, right, or lower side of the active region 110A according to the position of the peripheral region 110B. In addition, in the present embodiment, the length direction of the touch sensing line SL is parallel to the direction X. In other embodiments, the touch sensing line SL may be parallel to the direction Y.

In other embodiments, the gate driving circuit, the data driving circuit and/or the touch sensing circuit 120 may be respectively disposed in chips, and the chips may be bonded to pads disposed on the substrate S by Chip On Glass (COG), Tape Automated Bonding (TAB), Chip On Film (COF), etc. to respectively provide the gate driving circuit, the data driving circuit and/or the touch sensing circuit to the electronic elements in the active region 110A of the touch display panel 110. In particular, in some embodiments, the gate driving circuit, the data driving circuit and the touch sensing circuit 120 can be integrated into a Touch and Display Driver Integration (TDDI) chip.

It should be noted that the configuration of the touch sensing pad TP, the touch sensing line SL and the contact P shown in fig. 1 is only an example, and is not intended to limit the scope of the present invention. For example, each touch sensing pad TP may be electrically connected to the touch sensing line SL through a plurality of contacts P, and the number of the touch sensing pads TP and the number of the touch sensing lines SL may be determined according to the size of the active area 110A, the driving capability of the touch sensing circuit 120, the touch resolution requirement, and other conditions.

Fig. 2A is a partial plan view of an active region 110A of the touch display panel 110, and fig. 2B is a perspective view corresponding to fig. 2A. For convenience of illustration, fig. 2A and 2B only illustrate one pixel unit and the traces in the vicinity thereof, and those skilled in the art can directly understand that the structures of other pixel units and the corresponding traces can also be similar to those illustrated in fig. 2A and 2B.

In the active area 110A of the touch display panel 110, the signal lines for controlling the pixel units to display the corresponding gray scales include data lines DL and gate lines GL. In fig. 2A and 2B, two adjacent touch sensing lines SL and two adjacent gate lines GL are respectively located at the left and right sides and the top and bottom sides of the pixel unit, and data lines DL are respectively located at the right sides of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B in the pixel unit, wherein the touch sensing lines SL and the data lines DL are arranged along the direction X, and the gate lines GL are arranged along the direction Y. The direction X forms an angle with the direction Y. The angle between direction X and direction Y shown in fig. 2A is approximately 90 degrees. In other embodiments, the included angle between the direction X and the direction Y may be other than 90 degrees according to the pixel matrix configuration in the active area 110A of the touch display panel 110. In addition, the data line DL and the touch sensing line SL are both located above the gate line GL, and the gate line GL, the data line DL and the touch sensing line SL are not electrically connected to each other. A plurality of metal line segments ML arranged along the direction X are disposed below the touch sensing line SL and electrically connected to the touch sensing line SL. The metal line segments ML do not directly contact each other. As shown in fig. 2B, the metal line segments ML adjacent to the pixel units at left and right are located between the gate lines GL adjacent to each other at upper and lower positions, and are electrically insulated from the gate lines GL. The gate lines GL and the metal line segments ML belong to a first metal layer of the touch display panel 110, and the data lines DL and the touch sensing lines SL belong to a second metal layer of the touch display panel 110.

As shown in fig. 2B, the touch sensing line SL overlaps the metal line ML in the viewing direction (i.e., the direction Z) of the touch display panel 110, and the touch sensing line SL is electrically connected to the metal line ML through the connecting structure C. In the embodiment of fig. 2A and 2B, there are connection structures C on two opposite ends of the metal line segments ML, so each metal line segment ML can be regarded as being connected in parallel with the corresponding touch sensing line SL. In other embodiments, the metal line segment ML can be electrically connected to the corresponding touch sensing line SL through a single connection structure C or two or more (including two) connection structures C.

Since the metal line segment ML electrically connected to the touch sensing line SL is disposed below the touch sensing line SL, the impedance of the touch sensing line SL electrically connected to the metal line segment ML is lower than that of the touch sensing line SL not electrically connected to the metal line segment ML, so that the transmission delay distortion of the touch sensing signal can be reduced, the touch sensing efficiency of the touch display panel 110 can be improved, and the display problems such as the cross striation phenomenon can be effectively avoided.

In addition, the projection distance between the touch sensing line SL and/or the metal line ML and the adjacent data line DL is about 1 to 4 micrometers, so as to avoid the capacitive coupling between the touch sensing line SL and/or the metal line ML and the adjacent data line DL, and maintain the number of pixels per unit length of the touch display panel 110.

In some embodiments, the width of the metal line segment ML is maintained unchanged, the width of the touch sensing line SL is smaller than the width of the metal line segment ML, and the touch sensing line SL overlaps with the metal line segment ML in the viewing direction of the touch display panel 110; in other embodiments, the width of the touch sensing line SL is kept constant, the width of the metal line segment ML is smaller than the width of the touch sensing line SL, and the touch sensing line SL overlaps the metal line segment ML in the viewing direction of the touch display panel 110. As such, the touch sensing line SL and the metal line segment ML do not substantially affect the aperture ratio of the touch display panel 110.

FIG. 3 is a cross-sectional view taken along line A-A' of the partial schematic diagram shown in FIG. 2A. As shown in fig. 3, the gate line GL and the metal line segment ML are located on the substrate S, the gate insulating layer GI is located on the gate line GL, the metal line segment ML and the substrate S, the touch sensing line SL is located on the gate insulating layer GI, and the passivation layer PV is located on the touch sensing line SL. The gate insulating layer GI has a plurality of through holes TH, and the connection structures C are respectively located in the through holes TH and contact the corresponding metal line segment ML and the touch sensing line SL, so that the touch sensing line SL is electrically connected to the metal line segment ML through the through holes TH.

The touch display panel of the invention can have a top pixel electrode (top pixel) structure, i.e. the pixel electrode layer is positioned above the common electrode layer, or a top common electrode (top com) structure, i.e. the common electrode layer is positioned above the pixel electrode layer. Fig. 4A to 4E are layout diagrams of stages of manufacturing a touch display panel having an upper pixel electrode structure according to some embodiments of the invention. First, as shown in fig. 4A, a metal is deposited on a substrate S, and the deposited metal is subjected to photolithography and etching processes to form a first metal layer. The first metal layer includes the gate line GL, the metal line segment ML and the gate electrode GE of the pixel transistor TFT. The material used to form the first metal layer may include, but is not limited to, chromium, tungsten, tantalum, titanium, molybdenum, aluminum, copper, and other metal elements, or other similar elements, or an alloy or compound including any combination of the above metal elements.

Next, as shown in fig. 4B, a gate insulating layer (not shown in fig. 4B to 4E) is formed on the substrate S and the first metal layer, a through hole TH1 is formed in the gate insulating layer, and then a semiconductor layer SM is formed on the gate insulating layer and above the gate electrode GE of the thin film transistor TFT, respectively. The through holes TH1 are respectively located at two ends of the metal line ML and expose a portion of the upper surface of the metal line ML. The gate insulating layer is located above the gate of the metal layer. The material forming the gate insulating layer may be silicon nitride or the like, and the material forming the semiconductor layer SM may be amorphous silicon, single crystal silicon, polycrystalline silicon, or the like. The through hole TH1 may be formed by removing a portion of the gate insulating layer by photolithography and etching.

Thereafter, as shown in fig. 4C, a metal is deposited on the gate insulating layer and the semiconductor layer SM, and the deposited metal is subjected to photolithography and etching processes, so as to form a second metal layer and a connection structure C filling the through hole TH 1. The second metal layer includes a touch sensing line SL, a data line DL, and a source electrode SE and a drain electrode DE of the pixel transistor TFT. The source electrode SE and the drain electrode DE of the pixel transistor TFT contact the semiconductor layer SM, the connection structure C filling the penetration hole TH1 contacts the metal line segment ML and the touch sensing line SL, and the touch sensing line SL covers the metal line segment ML in a viewing direction (i.e., direction Z) of the touch display panel 110. The material used for forming the second metal layer and the connecting structure C may include, but is not limited to, chromium, tungsten, tantalum, titanium, molybdenum, aluminum, copper, and other metal elements, or other similar elements, or an alloy or a compound including any combination of the above metal elements.

Next, as shown in fig. 4D, a first passivation layer (not shown in fig. 4D and 4E) is formed on the second metal layer and the gate insulating layer, a penetration hole TH2 is formed in the first passivation layer, and then a common electrode layer CE is formed on the first passivation layer. The through hole TH2 exposes a portion of the upper surface of the touch sensing line SL, and the common electrode layer CE contacts the touch sensing line SL through the through hole TH2 to form a contact P, so that the common electrode layer CE is electrically connected to the touch sensing line SL. The common electrode layer CE may be formed of, for example, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), indium oxide (indium oxide), tin oxide (tin oxide), or other suitable transparent conductive materials. In addition to being used for image display, the common electrode layer CE is also used for touch sensing. Each touch sensing pad may be composed of the common electrode layer CE of the plurality of pixel units.

Next, as shown in fig. 4E, a second passivation layer (not shown in fig. 4E) is formed on the common electrode layer CE and the first passivation layer, and then a pixel electrode layer PE is formed on the first passivation layer and the second passivation layer. The openings of the first and second passivation layers expose a portion of the upper surface of the drain electrode DE of the pixel transistor TFT, and the pixel electrode layer PE contacts the drain electrode DE of the pixel transistor TFT through the openings, so that the pixel electrode layer PE is electrically connected to the pixel transistor TFT. Similar to the common electrode layer CE, a material forming the pixel electrode layer PE may be, for example, indium tin oxide, indium zinc oxide, indium oxide, tin oxide, or other suitable transparent conductive material.

Fig. 5A to 5E are layout diagrams of stages of manufacturing a touch display panel having an upper common electrode structure according to some embodiments of the invention. First, as shown in fig. 5A, a metal is deposited on a substrate S, and the deposited metal is subjected to photolithography and etching processes to form a first metal layer. The first metal layer includes the gate line GL, the metal line segment ML and the gate electrode GE of the pixel transistor TFT. Next, as shown in fig. 5B, a gate insulating layer (not shown in fig. 5B to 5E) is formed on the substrate S and the first metal layer, a through hole TH1 is formed in the gate insulating layer, and then a semiconductor layer SM is formed on the gate insulating layer and above the gate electrode GE of the thin film transistor TFT, respectively. Fig. 5A and fig. 5B are the same as fig. 4A and fig. 4B, respectively, and therefore the related description is please refer to the previous paragraphs, which are not repeated herein.

After that, as shown in fig. 5C, a pixel electrode layer PE is formed on the gate insulating layer. The pixel electrode layer PE and the semiconductor layer SM are located on different regions of the gate insulating layer. In addition, a material forming the pixel electrode layer PE may be, for example, indium tin oxide, indium zinc oxide, indium oxide, tin oxide, or other suitable transparent conductive material.

Next, as shown in fig. 5D, a metal is deposited on the gate insulating layer, the semiconductor layer SM and the pixel electrode layer PE, and the deposited metal is subjected to photolithography and etching processes, so as to form a second metal layer and a connection structure C filling the through hole TH 1. The second metal layer includes a touch sensing line SL, a data line DL, and a source electrode SE and a drain electrode DE of the pixel transistor TFT. The source electrode SE and the drain electrode DE of the pixel transistor TFT contact the semiconductor layer SM, and the drain electrode DE of the pixel transistor TFT also contacts the pixel electrode layer PE, so that the pixel electrode layer PE is electrically connected to the pixel transistor TFT. The connection structure C filling the through hole TH1 contacts the metal line ML and the touch sensing line SL, and the touch sensing line SL covers the metal line ML in a viewing direction (i.e., a direction Z) of the touch display panel 110. The material used for forming the second metal layer and the connecting structure C may include, but is not limited to, chromium, tungsten, tantalum, titanium, molybdenum, aluminum, copper, and other metal elements, or other similar elements, or an alloy or a compound including any combination of the above metal elements.

Next, as shown in fig. 5E, a passivation layer is formed on the pixel electrode layer PE, the second metal layer, and the gate insulating layer, a penetration hole TH2 is formed in the passivation layer, and then a common electrode layer CE is formed on the passivation layer and the second metal layer. The through hole TH2 exposes a portion of the upper surface of the touch sensing line SL, and the common electrode layer CE contacts the touch sensing line SL through the through hole TH2 to form a contact P, so that the common electrode layer CE is electrically connected to the touch sensing line SL. Similar to the pixel electrode layer PE, a material forming the common electrode layer CE may be, for example, indium tin oxide, indium zinc oxide, indium oxide, tin oxide, or other suitable transparent conductive material. In addition to being used for image display, the common electrode layer CE is also used for touch sensing. Each touch sensing pad may be composed of the common electrode layer CE of the plurality of pixel units.

It should be noted that, although the layout diagrams at the stages of fig. 4A to 4E and the layout diagrams at the stages of fig. 5A to 5E only illustrate a single sub-pixel and the layout patterns at the periphery thereof, it can be directly understood by those skilled in the art that the layout patterns of the sub-pixel units above or below the sub-pixel and the layout patterns at the periphery thereof are also the same as or similar to the layout patterns at the stages of fig. 4A to 4E or the layout patterns at the stages of fig. 5A to 5E. In addition, the layout patterns of the sub-pixels shown in fig. 4A to 4E and the layout patterns of the sub-pixels shown in fig. 5A to 5E may be the layout patterns of the red, green, or blue sub-pixels, but are not limited thereto.

Fig. 6 is a partial schematic view of an active region 110A of a touch display panel 110 according to another embodiment of the invention, and fig. 2B is a perspective view corresponding to fig. 2A. For convenience of illustration, fig. 6 also illustrates only one pixel unit and the traces in the vicinity thereof, and those skilled in the art can directly understand that the structures of other pixel units and the corresponding traces are similar to those illustrated in fig. 6.

The difference between fig. 6 and fig. 2B is that the metal line segment ML and the touch sensing line SL in fig. 6 belong to a second metal layer and a third metal layer, respectively. That is, in fig. 6, the gate line GL belongs to a first metal line, the metal line segment ML and the data line DL both belong to a second metal layer, and the touch sensing line SL belongs to a third metal layer. Other configurations of the elements in fig. 6 are similar to those shown in fig. 2A and fig. 2B, and therefore are not repeated herein. In other embodiments, the metal line segment ML and the touch sensing line SL in fig. 6 may be changed to belong to the first metal layer and the third metal layer, respectively.

Fig. 7 is a partial plan view of an active area of a touch display panel according to another embodiment of the invention. The touch display panel and the active area thereof may be the touch display panel 110 and the active area 110A thereof shown in fig. 1, or any touch display panel and the active area thereof after the content shown in fig. 1 is changed and configured. In fig. 7, the pixel unit has a touch sensing line SL and a gate line GL on both upper and lower sides thereof, and the pixel unit has a data line DL on both right sides of each sub-pixel (i.e., a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B), wherein the data line DL is disposed along a direction X, and the touch sensing line SL and the gate line GL are disposed along a direction Y. The data line DL and the touch sensing line SL are both located above the gate line GL, and the gate line GL, the data line DL and the touch sensing line SL are not electrically connected to each other.

A plurality of metal line segments ML arranged along the direction Y are arranged below the touch sensing line SL and electrically connected to the touch sensing line SL. The metal line segments ML are not in direct contact with each other, and are electrically insulated from the gate lines GL and the data lines DL. Similar to the embodiment of fig. 2A and 2B, in the embodiment of fig. 7, the touch sensing line SL overlaps the metal line ML in the viewing direction of the touch display panel, and the touch sensing line SL is electrically connected to the metal line ML through the connection structure C. The connecting structures C are disposed at two opposite ends of the metal line segments ML, so that each metal line segment ML can be regarded as being connected in parallel with the corresponding touch sensing line SL. In other embodiments, the metal line segment ML can be electrically connected to the corresponding touch sensing line SL through a single connection structure C or two or more (including two) connection structures C. In some embodiments, the gate line GL and the metal line segments ML belong to a first metal layer of the touch display panel, the data line DL belongs to a second metal layer of the touch display panel, and the touch sensing line SL belongs to a third metal layer of the touch display panel. In addition, in some embodiments, the gate line GL belongs to a first metal layer of the touch display panel, the data line DL and the metal line segments ML belong to a second metal layer of the touch display panel, and the touch sensing line SL belongs to a third metal layer of the touch display panel.

In summary, in the touch display panel of the invention, the metal line segment electrically connected to the touch sensing line is disposed below the touch sensing line, so that the impedance of the touch sensing line is reduced, and therefore, the transmission delay distortion of the touch sensing signal can be reduced, the touch sensing performance of the touch display panel can be improved, and the display problems such as the cross-striation can be effectively avoided.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.