Touch display panel and touch display device

Abstract

A touch display panel comprises a plurality of touch units (110) arranged in an array, each touch unit (110) comprises a connecting portion (113), a driving electrode (111), an induction electrode (112) and a virtual electrode (114), the driving electrode (111), the induction electrode (112) and the virtual electrode (114) are insulated from one another, the driving electrode (111) comprises a driving main portion (1111) and at least two driving branch portions (1112), and the driving main portion (1111) and the at least two driving branch portions (1112) are arranged in an intersecting contact mode. The induction electrode (112) comprises two induction sub-electrodes (1121) arranged on the two sides of the driving main part (1111), each induction sub-electrode (1121) comprises an induction main part (11211) and a plurality of induction branch parts (11212), the induction branch parts (11212) are arranged between every two adjacent driving branch parts (1112), the connecting part (113) is connected with the two induction sub-electrodes (1121), the virtual electrode (114) comprises a plurality of virtual sub-electrodes, and the virtual sub-electrodes (114) are connected with the connecting part (113). And at least part of the virtual sub-electrodes are arranged in the edge area of the touch unit (110).

Description

Touch display panel and touch display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a touch display panel and a touch display device. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] With the development of display technology, organic light-emitting diodes (OLEDs) have been widely used in display devices. They have many excellent characteristics, such as large viewing angle, wide color gamut, high brightness, and small pixels. In addition, touch technology, as a display-assisted technology, combines a touch panel (TP) with a display device to form a touch display device. This enables the display device to have touch functionality, allowing input through fingers, styluses, etc., making operation more intuitive and simple. However, in response to the growing application demand, there is still room for improvement in touch display devices.

[0004] Summary of the Invention

[0005] According to various embodiments of the present application, a touch display panel and a touch display device are provided.

[0006] In a first aspect, an embodiment of the present application provides a touch display panel, comprising a plurality of touch units arranged in an array, each of the touch units comprising:

[0007] A driving electrode comprising a driving main portion and at least two driving branches, wherein the driving main portion extends along a first direction, the driving branches are arranged at intervals along the first direction and extend along a second direction, and the driving branches are arranged to intersect and contact the driving main portion;

[0008] a sensing electrode insulated from the driving electrode, the sensing electrode comprising two sensing sub-electrodes disposed on either side of the driving main portion, each of the sensing sub-electrodes comprising a sensing main portion and a plurality of sensing branches, the sensing main portion extending along the first direction, the sensing branches extending along the second direction, wherein the sensing branch is disposed between two adjacent driving branches;

[0009] a connecting portion, wherein a first end of the connecting portion is connected to one of the two sensing sub-electrodes, and a second end of the connecting portion is connected to the other of the two sensing sub-electrodes;

[0010] The virtual electrode includes a plurality of virtual sub-electrodes, each of the virtual sub-electrodes is insulated from the sensing electrode and the driving electrode, and at least part of the virtual sub-electrodes is arranged at an edge region of the touch unit.

[0011] In a second aspect, an embodiment of the present application provides a touch display device, comprising the touch display panel provided in the first aspect.

[0012] The above-mentioned touch display panel and touch display device, the touch display panel includes a plurality of touch units arranged in an array, each touch unit includes a connecting portion and mutually insulated driving electrodes, sensing electrodes, and virtual electrodes, the driving electrode includes a driving main portion and at least two driving branches arranged in an intersecting and contacting manner, the sensing electrode includes two sensing sub-electrodes arranged on both sides of the driving main portion, each sensing sub-electrode includes a sensing main portion and a plurality of sensing branches, and the virtual electrode includes a plurality of virtual sub-electrodes, wherein the driving main portion and the sensing main portion extend along a first direction respectively, the driving branches and the sensing branches extend along a second direction respectively and are arranged at intervals along the second direction, and the two ends of the connecting portion correspond to the first ends of the two sensing sub-electrodes respectively. The touch control unit is connected to the touch control unit, and at least part of the virtual sub-electrodes are arranged in the edge area of ​​the touch control unit. Based on this, a single-bridge strip structure is formed, the driving electrode and the sensing electrode are fully coupled, and the mutual capacitance change caused by touch is increased. Compared with the touch control unit of the touch display panel in the traditional technology using a multi-bridge strip structure such as a diamond structure and a cross-shaped structure, the single-bridge strip structure provides a shorter current flow path and a smaller electrode area, so that the electrode impedance is smaller, the parasitic capacitance Cptx between the driving electrode and the sub-pixel is smaller, and the parasitic capacitance Cprx between the sensing electrode and the sub-pixel is smaller. In this way, the touch performance of the touch display panel, such as the signal-to-noise ratio (SNR), can be improved. ratio (SNR), suspension performance (Low Ground Mass, LGM), linear accuracy and other touch performance indicators, and in scenarios where the touch display panel is bent, such as when applied to a 3D curved touch display device, the single-bridge bar structure provided by the present application is compared with the multi-bridge bar structure in the traditional technology. The connecting portion in the present application is located in the middle area of ​​the touch unit and away from the edge area of ​​the touch unit, so that the connecting portion of the touch unit is away from the bending stress concentration area, avoiding the film crack (Crack) or peeling (Peeling) problem caused by the connecting portion of the touch unit being at the maximum bending curvature position when the screen edge bends to both sides, thereby improving the reliability and stability of the touch display panel.

[0013] The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0015] FIG1 is a schematic structural diagram of a touch display device according to an embodiment;

[0016] FIG2 is a schematic diagram of the structure of a touch display panel according to an embodiment;

[0017] FIG3 is a second structural diagram of a touch display device according to an embodiment;

[0018] FIG4 is a third structural diagram of a touch display device according to an embodiment;

[0019] FIG5 is a fourth structural diagram of a touch display device according to an embodiment;

[0020] FIG6 is a schematic diagram of a touch unit according to an embodiment;

[0021] FIG7 is a second structural diagram of a touch unit in one embodiment;

[0022] FIG8 is a third structural diagram of a touch unit in one embodiment;

[0023] FIG9 is a second structural diagram of a touch display panel according to an embodiment;

[0024] FIG10 is a fourth structural diagram of a touch unit in one embodiment;

[0025] FIG11 is a fifth structural diagram of a touch unit in one embodiment;

[0026] FIG12 is a sixth structural diagram of a touch unit in one embodiment;

[0027] FIG13 is a schematic diagram of a simulation of a touch display device according to an embodiment;

[0028] FIG. 14 is a schematic diagram of a simulation of a touch display device in another embodiment.

[0029] Description of reference numerals:

[0030] 1-touch display device, 10-display module, 11-touch display panel, 110-touch unit, 111-driving electrode, 1111-driving main part, 1112-driving branch, 11121-first branch, 11122-second branch, 11123-third branch, 112-sensing electrode, 1121-sensing sub-electrode, 11211-sensing main part, 11212-sensing branch, 113-connecting part, 1131- Connecting main part, 1132-first connecting column, 1133-second connecting column, 114-virtual electrode, 1141-first virtual sub-electrode, 1142-second virtual sub-electrode, 1143-third virtual sub-electrode, 1144-fourth virtual sub-electrode, 115-break, 12-metal trace, 13-touch chip, 14-light-emitting layer, 15-bridging layer, 16-insulating layer, 17-thin film encapsulation layer, 18-metal grid, 20-frame. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] It is understood that the terms "first," "second," and the like used herein may be used to describe various elements herein, but these elements are not limited by these terms. These terms are used solely to distinguish a first element from another element. For example, a first connecting post may be referred to as a second connecting post, and similarly, a second connecting post may be referred to as a first connecting post, without departing from the scope of this application. Both the first connecting post and the second connecting post are connecting posts, but they are not the same connecting post.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of this application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0034] The touch display panel involved in the embodiment of the present application is a self-capacitive touch display panel and can be applied to a touch display device, which can be a mobile phone, personal computer, tablet computer, wearable device such as a smart watch, etc.

[0035] In one embodiment, as shown in FIG1 , a touch display device 1 is described using a mobile phone as an example. The touch display device 1 includes a display module 10, a frame 20, and a battery cover. The display module 10 includes a cover plate and a touch display panel 11. The cover plate is mounted on the touch display panel 11 to cover the touch display panel 11. The cover plate may be a transparent glass cover plate, and may be made of a material such as sapphire.

[0036] The frame 20 can be made of a metal material such as aluminum alloy, magnesium alloy or stainless steel. The frame 20 is arranged on the periphery of the display screen module 10 to support and protect the display screen module 10. The display screen module 10 can be fixedly connected to the frame 20 by using a process such as dispensing glue. The battery cover is arranged on the side of the display area facing away from the display screen module 10 and is connected to the frame 20. Furthermore, an installation space can be formed between the battery cover and the touch display panel 11 for installing electronic components such as the battery, main board, camera module, etc. of the touch display device 1. Among them, the main board can integrate electronic components such as the processor, storage unit, power management module, baseband chip, etc. of the touch display device 1. Of course, in other embodiments, the touch display device 1 can be a tablet, a smart watch, etc.

[0037] In one embodiment, as shown in FIG2 , the touch display device 1 includes a touch display panel 11, and the touch display panel 11 includes a plurality of touch units 110 arranged in an array. The plurality of touch units 110 are arranged in a matrix along the row direction and the column direction, and can form a plurality of touch display rows and a plurality of touch display columns. The plurality of touch display rows and the plurality of touch display columns are arranged crosswise to form a touch display area. The touch display rows can be a metal grid of sensing electrodes that are connected and conducted horizontally, and the touch display columns can be a metal grid of driving electrodes that are continuously conducted vertically. The driving electrodes are electrically connected through a connecting portion 113 (conductive bridge), and the positions of the driving electrodes and the sensing electrodes can be interchanged. The touch electrodes (driving electrodes or sensing electrodes) can be connected to a touch chip (Touch IC) 13 through an edge metal trace 12, and the touch chip 13 provides support for the touch function of the touch display device 1.

[0038] In one embodiment, as shown in Figures 3 to 5, the touch display device 1 includes a touch display panel 11 and a light-emitting layer 14. The light-emitting layer 14 is located on the side of the bridge layer 15 of the touch display panel 11 away from the insulating layer 16. The touch display device 1 may further include a thin film encapsulation layer (TFE) 17. The thin film encapsulation layer 17 is located on the side of the bridge layer 15 away from the insulating layer 16 and on the side of the light-emitting layer 14 close to the bridge layer 15. That is, the thin film encapsulation layer 17 is located between the light-emitting layer 14 and the bridge layer 15. The light-emitting layer 14 is provided with a plurality of sub-pixels arranged in an array. The sub-pixels include red sub-pixels (R), green sub-pixels (G), and blue sub-pixels (B). The sub-pixels can use OLEDs as light-emitting elements. The drive electrodes 111 and the sensing electrodes 112 in the touch display panel 11 are a metal grid 18 structure, and the sub-pixels are located in the gaps between the metal grid 18. That is, the projection of the metal grid 18 onto the light-emitting layer 14 does not overlap with the sub-pixels. Based on this, the touch performance and light-emitting performance of the touch display device 1 are guaranteed.

[0039] In one embodiment, as shown in Figures 6 to 8, each touch unit 110 includes a driving electrode (Tx) 111, a sensing electrode (Rx) 112, a connecting portion (Bridge) 113 and a dummy (Dummy) electrode 114. Among them, the driving electrode 111 includes a driving main portion 1111 and at least two driving branches 1112. The driving main portion 1111 extends along a first direction. The driving branches 1112 are arranged at intervals along the first direction and extend along the second direction, and each driving branch 1112 is arranged to intersect and contact with the driving main portion 1111 to form an electrical connection. The number of driving branches 1112 can be any suitable number such as 2, 4, 6, etc., and is not limited here. For example, the first direction is perpendicular to the second direction, the first direction can be the X-axis direction, and the second direction can be the Y-axis direction.

[0040] The sensing electrode 112 is insulated from the driving electrode 111. The sensing electrode 112 includes two sensing sub-electrodes 1121 provided on both sides of the driving main part 1111. Exemplarily, the two sensing sub-electrodes 1121 are symmetrically provided on both sides of the driving main part 1111. Each sensing sub-electrode 1121 includes a sensing main part 11211 and a plurality of sensing branches 11212. The sensing main part 11211 extends along a first direction. The sensing branches 11212 are arranged at intervals along the first direction and extend along a second direction, and the sensing branches 11212 are arranged to intersect and contact with the sensing main part 11211 to form an electrical connection. The number of sensing branches 11212 can be any suitable number such as 3, 5, 7, etc., and is not limited here. Exemplarily, the sensing main part 11211 and the sensing branches 11212 are rectangular structures. A sensing branch 11212 is provided between two adjacent driving branches 1112. That is, the sensing branch 11212 is provided between two adjacent driving branches 1112. Exemplarily, the driving electrodes 111 and the sensing electrodes 112 adopt a metal mesh 18 structure.

[0041] The first end of the connecting portion 113 is connected to one of the two sensing sub-electrodes 1121, and the second end of the connecting portion 113 is connected to the other of the two sensing sub-electrodes 1121, thereby electrically connecting the two sensing sub-electrodes 1121 through the connecting portion 113. Exemplarily, the first end of the connecting portion 113 is connected to one of the sensing branches 11212 of the two sensing sub-electrodes 1121, and the second end of the connecting portion 113 is connected to the corresponding sensing branch 11212 of the other of the two sensing sub-electrodes 11212.

[0042] The virtual electrode 114 includes multiple virtual sub-electrodes. Each virtual sub-electrode is insulated from the drive electrode 111 and the sensing electrode 112, and each virtual sub-electrode is in a floating state, that is, each virtual sub-electrode is not electrically connected to the drive electrode 111 and the sensing electrode 112. In addition, at least some of the virtual sub-electrodes are arranged in the edge area of ​​the touch control unit 110, such as the virtual sub-electrode 1141 and the virtual sub-electrode 1142 shown in Figure 6, thereby isolating the drive electrode 111 of one touch control unit 110 from the drive electrode 111 of another touch control unit 110 in the second direction, maintaining electrical insulation between the drive electrodes 111 of two adjacent touch control units 110.

[0043] The touch display panel 11 includes a plurality of touch units 110 arranged in an array. The driving electrodes 111, sensing electrodes 112, connecting portions 113, and dummy electrodes 114 in each touch unit 110 form a single-bridge strip structure. The driving electrodes 111 and the sensing electrodes 112 are fully coupled, thereby increasing the change in mutual capacitance caused by touch. Compared to conventional touch display panels 11 in which the touch units 110 adopt multiple-bridge strip structures, such as diamond structures or cross-shaped structures, the single-bridge strip structure provides a shorter current flow path and a smaller electrode area, resulting in lower electrode impedance, smaller parasitic capacitance Cptx between the driving electrode 111 and the sub-pixel, and smaller parasitic capacitance Cprx between the sensing electrode 112 and the sub-pixel. In this way, the touch performance of the touch display panel 11, such as touch performance indicators such as SNR, LGM, and linear accuracy, can be improved. In addition, in a scenario where the touch display panel 11 is bent, such as when applied to a 3D curved touch display device 1, the single-bridge strip structure provided by the present application is compared with the multi-bridge strip structure in the traditional technology. The connection portion 113 in the present application is located in the middle area of ​​the touch unit 110, away from the edge area of ​​the touch unit 110, so that the connection portion 113 of the touch unit 110 is away from the bending stress concentration area, avoiding the film cracks or peeling problems caused by the connection portion 113 of the touch unit 110 being at the maximum bending curvature position when the screen edge is bent to both sides, thereby improving the reliability and stability of the touch display panel 11.

[0044] In one embodiment, referring to FIG6 , the driving branch 1112 includes a first branch 11121 and a second branch 11122. The first branch 11121 is located at the first end of the driving main portion 1111, and the second branch 11122 is located at the second end of the driving main portion 1111. The first end and the second end of the driving main portion 1111 are two ends disposed opposite each other in a first direction. Each sensing branch 11212 is disposed between the first branch 11121 and the second branch 11122. For example, the first branch 11121 and the second branch 11122 are symmetrically disposed about the driving main portion 1111.

[0045] In one embodiment, referring to Figures 7 and 8 , the driving branch 1112 includes a first branch 11121, a second branch 11122, and a plurality of third branches 11123. The first branch 11121 is located at the first end of the driving main portion 1111, and the second branch 11122 is located at the second end of the driving main portion 1111. The third branches 11123 are spaced apart along the first direction through the sensing branch 11212, and are located between the first branch 11121 and the second branch 11122. The two ends of the third branches 11123 do not extend to the edge of the touch unit 110, that is, the length of the third branches 11123 in the second direction is less than the length of the touch unit 110.

[0046] In one embodiment, referring to FIG. 7 , the width D3 of the third branch 11123 is greater than the width D1 of the first branch 11121, and the width D1 of the first branch 11121 is the same as the width D2 of the second branch 11122. That is, D3>D1=D2. The width of each branch (the first branch 11121, the second branch 11122, and the third branch 11123) refers to the width in the first direction. Exemplarily, the width D3 of the third branch 11123 is less than or equal to one-sixth of the touch unit 110, that is, D3≤W / 6.

[0047] 7 , in one embodiment, the width D3 of the third branch 11123 is twice the width D1 of the first branch 11121 or the width D2 of the second branch 11122. That is, D3 = 2*D1 = 2*D2.

[0048] 6 to 8 , each driving branch 1112 is symmetrically arranged along the first direction with respect to the driving main portion 1111. For example, the driving main portion 1111 and the driving branch 1112 are rectangular structures.

[0049] In one embodiment, referring to FIG. 6 , a first end of each sensing branch 11212 is connected to the sensing main portion 11211 , a second end of each sensing branch 11212 is disposed near an edge of the touch unit 110 , and the sensing main portion 11211 is disposed near the driving main portion 1111 .

[0050] In one embodiment, referring to FIG. 7 , the first end of each sensing branch 11212 is disposed close to the driving main portion 1111 , the second end of each sensing branch 11212 is connected to the sensing main portion 11211 , and the sensing main portion 11211 is disposed close to the edge of the touch unit 110 .

[0051] In Figures 6 and 7 , for the sensing sub-electrode 1121 located above the second direction, the first end of its sensing branch 11212 is the lower end in the second direction, and the second end of its sensing branch 11212 is the upper end in the second direction; for the sensing sub-electrode 1121 located below the second direction, the first end of its sensing branch 11212 is the upper end in the second direction, and the second end of its sensing branch 11212 is the lower end in the second direction.

[0052] In one embodiment, referring again to FIG. 7 , the total height H of the sensing branches 11212 and the main sensing portion 11211 is less than or equal to half the height of the touch unit 110, that is, H ≤ G / 2. Exemplarily, the height h of the main sensing portion 11211 is less than or equal to one-quarter the total height H of the sensing branches 11212 and the main sensing portion 11211, that is, h ≤ H / 4.

[0053] 8 , the sensing branches 11212 are symmetrically arranged about the sensing main portion 11211. That is, for each sensing sub-electrode 1121, the sensing main portion 11211 is located in the middle of the sensing branches 11212 in the second direction.

[0054] In one embodiment, referring to Figures 6 to 8 , the virtual electrode 114 includes a plurality of first virtual sub-electrodes 1141, each of which is disposed correspondingly at the two ends of the two target drive branches 1112 in the second direction. Each first virtual sub-electrode 1141 is located near the edge of the touch unit 110. That is, the plurality of first virtual sub-electrodes 1141 are located at the four corners of the touch unit 110. The two target drive branches 1112 are drive branches 1112 located at the two ends of the drive main portion 1111 in the first direction, that is, at the two ends of the first branch 11121 and the second branch 11122. Based on this, the first virtual sub-electrodes 1141 can be used to disconnect the drive electrode 111 of one touch unit 110 from the drive electrode 111 of another touch unit 110, thereby maintaining electrical insulation between the drive electrodes 111 of adjacent touch units 110 and ensuring the display performance of the touch display panel 11. Taking the structure shown in Figure 8 as an example, Figure 9 shows a schematic structural diagram of multiple touch units 110 shown in Figure 8 arranged in an array. As shown in Figure 9, the driving electrodes 111 of two adjacent touch units 110 are disconnected by the first virtual sub-electrode 1141, so that the driving electrodes 111 of the two adjacent touch units 110 remain electrically insulated.

[0055] In one embodiment, please continue to refer to Figures 6 and 8. The virtual electrode 114 includes a plurality of first virtual sub-electrodes 1141 and a plurality of second virtual sub-electrodes 1142. The plurality of first virtual sub-electrodes 1141 are respectively arranged at the two ends of the two target drive branches 1112 (the first branch 11121 and the second branch 11122) in the second direction. The second virtual sub-electrode 1142 is arranged between two adjacent sensing branches 11212, and the second virtual sub-electrode 1142 is close to the edge area of ​​the touch unit 110. Based on this, the touch unit 110 is filled with the first virtual sub-electrodes 1141 and the second virtual sub-electrode 1142, which reduces the area of ​​the drive electrode 111 and the sensing electrode 112, thereby reducing the parasitic capacitance between the drive electrode 111 and the sensing electrode 112 and the sub-pixel, thereby improving the touch performance of the touch display panel 11, for example, it can improve key touch performance indicators such as SNR, LGM, and linear accuracy.

[0056] In one embodiment, as shown in FIG10 , the dummy electrode 114 includes a plurality of first dummy sub-electrodes 1141 and at least one third dummy sub-electrode 1143. The plurality of first dummy sub-electrodes 1141 are respectively disposed at the two ends of the two target driving branches 1112 in the second direction. The third dummy sub-electrode 1143 is disposed in the sensing electrode 112 or the driving electrode 111. The third dummy sub-electrode 1143 can be disposed in at least one of the sensing main portion 11211, the sensing branch 11212, the driving main portion 1111, and the driving branch 1112. For example, the third dummy sub-electrode 1143 is disposed in both the sensing main portion 11211 and the driving branch 1112 shown in FIG10 . In practical applications, when the mutual capacitance between the driving electrode 111 and the sensing electrode 112 is within a preset range, the area of ​​the third virtual sub-electrode 1143 can be increased to reduce the parasitic capacitance Cptx between the driving electrode 111 and the sub-pixel, and reduce the parasitic capacitance Cprx between the sensing electrode 112 and the sub-pixel, thereby reducing the driving load of the touch display panel 11 and improving the touch sensitivity of the touch display panel 11.

[0057] In one embodiment, using the touch unit 110 shown in FIG8 as an example, as shown in FIG11 , the dummy electrode 114 includes a plurality of first dummy sub-electrodes 1141 and at least one fourth dummy sub-electrode 1144. The plurality of first dummy sub-electrodes 1141 are respectively disposed at the two ends of the two target driving branches 1112 in the second direction. The fourth dummy sub-electrode 1144 is disposed between the sensing electrode 112 and the driving electrode 111. In other words, the fourth dummy sub-electrode 1144 is disposed at the junction of the sensing electrode 112 and the driving electrode 111. Exemplarily, the fourth dummy sub-electrode 1144 is disposed between the end of the driving branch 1112 and the sensing main portion 11211. The fourth dummy sub-electrode 1144 is in a suspended state and is electrically insulated from the driving electrode 111 and the sensing electrode 112, thereby maintaining electrical insulation between the driving electrode 111 and the sensing electrode 112, thereby ensuring the touch performance of the touch display panel 11.

[0058] In one embodiment, referring to FIG. 11 , the width of the fourth virtual sub-electrode 1144 is a preset multiple of the sub-pixel width, where the sub-pixel is a sub-pixel disposed adjacent to the touch unit 110. The width of the fourth virtual sub-electrode 1144 refers to the spacing between the drive electrode 111 and the sense electrode 112. The preset multiple is pre-set and can be set based on factors such as the size of the touch display panel 11, the size of the sub-pixel, the size of the touch unit 110, the size of the drive electrode 111, and the size of the sense electrode 112. Exemplarily, the width of the fourth virtual sub-electrode 1144 ranges from 1 / 2 the sub-pixel width to 2 times the pixel width.

[0059] In one embodiment, using the touch control unit 110 shown in FIG8 as an example, as shown in FIG12 , the sensing electrodes 112 and the driving electrodes 111 are insulated by a break 115. Break 115 is located at the junction of the driving electrode 111 and the sensing electrode 112. Exemplarily, the width of break 115 is less than or equal to 5 microns, and the width of break 115 is equal to the spacing between the sensing electrode 112 and the driving electrode 111. Therefore, break 115 isolates the driving electrode 111 from the sensing electrode 112, thereby ensuring electrical insulation between the driving electrode 111 and the sensing electrode 112, thereby ensuring the touch performance of the touch display panel 11.

[0060] In one embodiment, please continue to refer to Figures 6 to 12. At least one first through hole is provided at the first end of the first target sensing branch 11212. At least one second through hole is provided at the first end of the second target sensing branch 11212. The connecting portion 113 passes through the first through hole and the second through hole, and is connected to the first target sensing branch 11212 and the second target sensing branch 11212, respectively. The first target sensing branch 11212 and the second target sensing branch 11212 are symmetrically arranged with respect to the driving main portion 1111, and the first end of the first target sensing branch 11212 and the first end of the second target sensing branch 11212 are ends close to the driving main portion 1111. Exemplarily, the first target sensing branch 11212 is the sensing branch 11212 in the middle of the sensing sub-electrode 1121 in the first direction, and the first end of the first target sensing branch 11212 is the bottom in the second direction; the second target sensing branch 11212 is the sensing branch 11212 in the middle of the sensing sub-electrode 1121 in the first direction, and the first end of the second target sensing branch 11212 is the top in the second direction. The number of the first through hole, the second through hole, and the connecting portion 113 is equal, and the number of the first through hole, the second through hole, and the connecting portion 113 can be any suitable number, such as 1, 2, 3, etc., and is not limited here. Based on this, the two sensing sub-electrodes 1121 are connected through the connecting portion 113, thereby forming an electrical connection, thereby ensuring the display performance of the touch display panel 11.

[0061] In one embodiment, please continue to refer to Figure 3. The touch display panel 11 includes a bridging layer 15, an insulating layer 16, and an electrode layer stacked in sequence. The driving electrode 111 and the sensing electrode 112 are located in the electrode layer. Please continue to refer to Figures 6 to 12. The connecting portion 113 includes a connecting main portion 1131, a first connecting column 1132, and a second connecting column 1133. The connecting main portion 1131 is located in the bridging layer 15. The first connecting column 1132 is located in the first through hole, and the first connecting column 1132 is respectively connected to the connecting main portion 1131 and the first target sensing branch 11212. The second connecting column 1133 is located in the second through hole, and the second connecting column 1133 is respectively connected to the connecting main portion 1131 and the second target sensing branch 11212. Based on this, the connecting portion 113 connects the two sensing sub-electrodes 1121 via the connecting main portion 1131 , the first connecting pillar 1132 and the second connecting pillar 1133 , so that the two sensing sub-electrodes 1121 are electrically connected, thereby ensuring the display performance of the touch display panel 11 .

[0062] For the touch display panel 11 provided in each of the above embodiments, the following test data can be obtained through simulation: (1) the capacitance Cm of the driving electrode 111 and the sensing electrode 112 are both ≤0.6 pf; (2) the ratio of the change in Cm caused by a finger touch, σCm, to the capacitance Cm, σCm / Cm, ≥20%; (3) the parasitic capacitance Cp between a single driving electrode 111 and a sub-pixel cathode (OLED Cath) is ≤15 pf; (4) the parasitic capacitance Cp between a single sensing electrode 112 and a sub-pixel cathode is ≤15 pf; (5) the impedance Tx_R of the driving electrode 111 is ≤20 Ω; (6) the impedance Rx_R of the sensing electrode 112 is ≤20 Ω. Based on these simulation data, it can be seen that in the touch display panel 11 provided by the embodiment of the present application, each touch unit 110 has a single-bridge bar structure, in which the driving electrode 111 and the sensing electrode 112 are fully coupled, thereby increasing the change in mutual capacitance caused by touch. At the same time, the area ratio of the driving electrode 111, the sensing electrode 112 and the virtual electrode 114 is reasonably designed. Compared with the multi-bridge structure of traditional technologies such as diamond and cross-shaped structures, the electrode impedance and parasitic capacitance of the present application are smaller, thereby effectively improving the touch performance of the touch display panel 11, such as SNR, LGM, and linear accuracy.

[0063] In one embodiment, referring to Figures 1 to 12, a touch display device 1 is provided, which includes a touch display panel 11 provided by any of the aforementioned embodiments. The touch display device 1 includes a touch display panel 11, and the touch display panel 11 includes a plurality of touch units 110 arranged in an array. The driving electrodes 111, the sensing electrodes 112, the connecting portions 113, and the virtual electrodes 114 in each touch unit 110 form a single-bridge-like strip structure. The driving electrodes 111 and the sensing electrodes 112 are fully coupled, thereby increasing the mutual capacitance change caused by touch. Compared with the touch units 110 of the touch display panel 11 in the conventional technology, which adopt a multi-bridge-like strip structure such as a diamond structure or a cross-shaped structure, the single-bridge-like strip structure provides a shorter current flow path and a smaller electrode area, resulting in a smaller electrode impedance, a smaller parasitic capacitance Cptx between the driving electrode 111 and the sub-pixel, and a smaller parasitic capacitance Cprx between the sensing electrode 112 and the sub-pixel, thereby improving the touch display. The touch performance of the panel 11, such as touch performance indicators such as SNR, LGM, and linear accuracy, is improved, thereby improving the touch performance of the touch display device 1; and, in a scenario where the touch display panel 11 is bent, such as when applied to a 3D curved touch display device 1, the single-bridge bar structure provided by the present application is compared with the multi-bridge bar structure in the traditional technology. The connection portion 113 in the present application is located in the middle area of ​​the touch unit 110, away from the edge area of ​​the touch unit 110, so that the connection portion 113 of the touch unit 110 is away from the bending stress concentration area, avoiding the film crack or peeling problem caused by the connection portion 113 of the touch unit 110 being at the maximum bending curvature position when the screen edge is bent to both sides, thereby improving the reliability and stability of the touch display panel 11, thereby improving the reliability and stability of the touch display device 1.

[0064] Figures 13 and 14 are simulation diagrams of the touch display device 1 provided in an embodiment of the present application. As can be seen from Figures 13 and 14, the connection portion 113 of the touch unit 110 in the touch display device 1 is not located in the region of maximum stress, but rather in the region of minimum stress. This simulation demonstrates that the touch display device 1 provided in the present application has improved touch performance, with higher sensitivity, reliability, and stability.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A touch display panel, characterized in that: The invention comprises a plurality of touch control units arranged in an array, each of the touch control units comprising: A driving electrode, comprising a driving main portion and at least two driving branches, wherein the driving main portion extends along a first direction, the driving branches are arranged at intervals along the first direction and extend along a second direction, and the driving branches are arranged to intersect and contact with the driving main portion; a sensing electrode, insulated from the driving electrode, the sensing electrode comprising two sensing sub-electrodes arranged on both sides of the driving main part, each of the sensing sub-electrodes comprising a sensing main part and a plurality of sensing branches, the sensing main part extending along the first direction, the sensing branches extending along the second direction, wherein the sensing branch is arranged between two adjacent driving branches; a connecting portion, wherein a first end of the connecting portion is connected to one of the two sensing sub-electrodes, and a second end of the connecting portion is connected to the other of the two sensing sub-electrodes; The virtual electrode includes a plurality of virtual sub-electrodes, each of which is insulated from the sensing electrode and the driving electrode, and at least part of the virtual sub-electrodes is disposed at an edge region of the touch control unit.

2. The touch display panel according to claim 1, characterized in that: The driving branch portion includes a first branch portion and a second branch portion, wherein the first branch portion is located at a first end of the driving main portion, and the second branch portion is located at a second end of the driving main portion.

3. The touch display panel according to claim 2, characterized in that: The driving branch also includes a plurality of third branches, each of which is arranged at intervals and located between the first branch and the second branch; wherein two ends of the third branch do not extend to the edge of the touch unit.

4. The touch display panel according to claim 3, characterized in that: The width of the third branch is greater than that of the first branch, and the widths of the first branch and the second branch are the same, wherein the width of each branch is the width in the first direction.

5. The touch display panel according to claim 4, characterized in that: The width of the third branch is twice the width of the first branch.

6. The touch display panel according to claim 1, characterized in that: The two inductive sub-electrodes are symmetrically arranged on two sides of the driving main part.

7. The touch display panel according to claim 6, characterized in that: The first end of each of the sensing branches is connected to the sensing main part, the second end of each of the sensing branches is arranged close to the edge of the touch control unit, and the sensing main part is arranged close to the driving main part.

8. The touch display panel according to claim 6, characterized in that: The first end of each of the sensing branches is disposed close to the driving main part, the second end of each of the sensing branches is connected to the sensing main part, and the sensing main part is disposed close to the edge of the touch control unit.

9. The touch display panel according to claim 6, characterized in that: The induction branches are symmetrically arranged with respect to the induction main part.

10. The touch display panel according to claim 1, characterized in that: The virtual electrode includes a plurality of first virtual sub-electrodes, and the plurality of first virtual sub-electrodes are respectively arranged at two ends of two target driving branches, and the two target driving branches are driving branches located at two ends of the driving main part.

11. The touch display panel according to claim 10, characterized in that: The virtual electrode further includes a plurality of second virtual sub-electrodes, and the second virtual sub-electrodes are arranged between two adjacent sensing branches.

12. The touch display panel according to claim 10, characterized in that: The virtual electrode further includes at least one third virtual sub-electrode, and the third virtual sub-electrode is arranged in the sensing electrode or the driving electrode.

13. The touch display panel according to claim 10, characterized in that: The virtual electrode further includes at least one fourth virtual sub-electrode, and the fourth virtual sub-electrode is arranged between the sensing electrode and the driving electrode.

14. The touch display panel according to claim 13, characterized in that: The fourth virtual sub-electrode is disposed between an end of the driving branch and the sensing main part.

15. The touch display panel according to claim 13, characterized in that: The width of the fourth virtual sub-electrode is a preset multiple of the width of a sub-pixel, and the sub-pixel is a sub-pixel disposed adjacent to the touch control unit.

16. The touch display panel according to claim 1, characterized in that: The sensing electrode and the driving electrode are insulated by a break.

17. The touch display panel according to claim 16, characterized in that: The width of the fracture is less than or equal to 5 micrometers, and the width of the fracture is equal to the interval between the sensing electrode and the driving electrode.

18. The touch display panel according to claim 1, characterized in that: The first end of the first target sensing branch is provided with at least one first through hole, and the first end of the second target sensing branch is provided with at least one second through hole, and the connecting portion passes through the first through hole and the second through hole, and is respectively connected to the first target sensing branch and the second target sensing branch; wherein the first target sensing branch and the second target sensing branch are symmetrically arranged with respect to the driving main portion, and the first end of the first target sensing branch and the first end of the second target sensing branch are ends close to the driving main portion.

19. The touch display panel according to claim 18, characterized in that: The touch display panel includes a bridging layer, an insulating layer and an electrode layer which are stacked in sequence, the driving electrode and the sensing electrode are located in the electrode layer, and the connecting part includes a connecting main part, a first connecting column and a second connecting column, wherein the connecting main part is located in the bridging layer, the first connecting column is located in the first through hole, and the first connecting column is respectively connected to the connecting main part and the first target sensing branch, the second connecting column is located in the second through hole, and the second connecting column is respectively connected to the connecting main part and the second target sensing branch.

20. A touch display device, characterized in that: Comprising a touch display panel as described in any one of claims 1-19.

21. The touch display device according to claim 20, characterized in that: The touch display device further includes: The light-emitting layer is located on a side of the bridge layer of the touch display panel away from the insulating layer, and the light-emitting layer is provided with a plurality of sub-pixels arranged in an array.

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