CN108509093B - Touch display panel and touch display device - Google Patents

Abstract

The invention discloses a touch display panel and a touch display device, comprising: a substrate layer; a first insulating layer; the first touch electrode and the second touch electrode are positioned on one side of the first insulating layer, which is far away from the substrate layer, and are arranged in an insulating way with the first touch electrode; the first extension electrode is positioned on one side of the substrate layer close to the first insulating layer and is arranged in a non-same layer with the first touch electrode in an insulating way; the first extension electrode is provided with a first electrode corresponding to the first extension electrode, the projection of the first extension electrode on the substrate layer is at least partially overlapped with the projection of the first electrode on the substrate layer, and the first electrode is any one first touch electrode; the first extension electrode is electrically connected with the second electrode, the second electrode is any one of the second touch electrodes, and the projection of the first electrode on the substrate layer is adjacent to the projection of the second electrode on the substrate layer. Through setting up first extension electrode to increased the relative area of first electrode and second electrode, increased mutual capacitance's capacitance value promptly, improved touch sensitivity.

Description

Touch display panel and touch display device

Technical Field

The present invention relates to the field of touch display, and more particularly, to a touch display panel and a touch display device.

Background

In recent years, with the gradual development of touch technologies, display panels of devices such as smart phones, smart tablets, wearable devices, and the like generally adopt touch display panels with touch functions, and the touch display panels can be classified into resistive type, capacitive type, optical type, and acoustic wave type according to different sensing technologies, wherein the capacitive type touch display panel can adopt self-capacitive type touch technology or mutual capacitive type touch technology. In the self-capacitance touch technology, the touch electrode and the ground are respectively used as two poles of a self-capacitance, when a user performs touch operation, the capacitance of a finger is increased to the self-capacitance, so that the capacitance of the self-capacitance is increased and a touch signal is generated.

In the mutual capacitance touch technology, the touch electrodes include a horizontal touch electrode and a vertical touch electrode, and the difference between the mutual capacitance touch technology and the self-capacitance touch technology is that a mutual capacitance is formed at the crossing position of two groups of electrodes, that is, the two groups of electrodes respectively form two electrode plates of the mutual capacitance. When a user performs a touch operation, the distance between two electrodes of the mutual capacitance near the touch point is affected, thereby changing the capacitance between the two electrodes. When the touch control point is detected, excitation signals are sequentially sent to the transverse touch control electrodes, and all the longitudinal touch control electrodes receive detection signals at the same time, so that the capacitance value of the intersection point of all the transverse touch control electrodes and the longitudinal touch control electrodes, namely the capacitance value of the two-dimensional plane of the whole touch screen, can be obtained, and the touch control point is determined.

Since the self-capacitance touch technology detects ghost points when a user performs multi-point touch operation, that is, real multi-point touch cannot be realized, more and more touch display panel manufacturers choose to adopt the mutual capacitance touch technology.

When a user uses the capacitive touch panel, a finger is generally used to click or slide on the touch panel to input an instruction to the electronic device, and the electronic device receives the instruction and then performs corresponding feedback.

Therefore, it is an urgent need in the art to provide a touch display panel and a touch display device, which can improve the touch performance and touch sensitivity of the touch display panel.

Disclosure of Invention

In view of the above, the present invention provides a touch display panel and a touch display device, which improve the touch performance and the touch sensitivity of the touch display panel.

In order to solve the above technical problem, the present invention provides a touch display panel, including:

a substrate layer;

a first insulating layer on one side of the substrate layer;

the first touch electrode is positioned on one side, far away from the substrate layer, of the first insulating layer;

the second touch electrode is positioned on one side, far away from the substrate layer, of the first insulating layer and is arranged in an insulating way with the first touch electrode;

the first extension electrode is positioned on one side, close to the first insulating layer, of the substrate layer and is arranged on a different layer from the first touch electrode in an insulating way;

any one of the first extension electrodes is provided with a first electrode corresponding to the first extension electrode, the projection of the first extension electrode on the substrate layer is at least partially overlapped with the projection of the first electrode on the substrate layer, and the first electrode is any one of the first touch electrodes; the first extension electrode is electrically connected with a second electrode, the second electrode is any one of the second touch electrodes, and the projection of the first electrode on the substrate layer is adjacent to the projection of the second electrode on the substrate layer.

The invention further provides a touch display device comprising any one of the touch display panels provided by the invention.

Compared with the prior art, the touch display panel and the touch display device have the advantages that:

the touch display panel and the touch display device provided by the invention adopt a mutual capacitance touch technology, and the first extension electrode which is not in the same layer as the first electrode is arranged and is electrically connected with the second electrode, so that the first extension electrode is used as a part of the second electrode, and the relative area of the first electrode and the second electrode is increased, namely, the capacitance value of mutual capacitance for detecting touch signals is increased, the touch sensitivity is improved, and the user experience is improved.

Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a top view of a touch display device in the prior art;

FIG. 2 is an enlarged view of area A of FIG. 1;

FIG. 3 is a cut-away view taken along line AA' of FIG. 2;

FIG. 4 is a top view of a touch display panel according to an embodiment of the present invention;

FIG. 5 is an enlarged view of area B of FIG. 4;

FIG. 6 is a cut-away view taken along line BB' of FIG. 5;

FIG. 7 is a partially enlarged view of a touch display panel according to an embodiment of the present invention;

FIG. 8 is a cut-away view taken along line CC' of FIG. 7;

FIG. 9 is a cut-away view taken along line DD' in FIG. 7;

FIG. 10 is a partially enlarged view of a touch display panel according to an embodiment of the present invention;

FIG. 11 is a cut-away view taken along line EE' of FIG. 10;

FIG. 12 is a partially enlarged view of a touch display panel according to an embodiment of the present invention;

FIG. 13 is a perspective view of the region P in FIG. 12

FIG. 14 is a partially enlarged view of another touch display panel according to an embodiment of the present invention;

FIG. 15 is a cut-away view taken along line FF' of FIG. 14;

FIG. 16 is a partially enlarged view of another touch display panel according to an embodiment of the present invention;

FIG. 17 is a cut-away view taken along line GG' of FIG. 16;

FIG. 18 is a sectional view taken along line HH' of FIG. 16;

FIG. 19 is a partially enlarged view of another touch display panel according to an embodiment of the present invention;

FIG. 20 is a perspective view of region Q of FIG. 19;

FIG. 21 is a partially enlarged view of another touch display panel according to an embodiment of the present invention;

FIG. 22 is a cut-away view taken along line JJ' of FIG. 21;

FIG. 23 is a cut away view taken along line KK' of FIG. 21;

FIG. 24 is a partially enlarged view of another touch display panel according to an embodiment of the present invention;

FIG. 25 is a cut-away view taken along line LL' of FIG. 24;

FIG. 26 is a perspective view of region T of FIG. 24;

FIG. 27 is a cut away view of FIG. 24 taken along cut line MM';

FIG. 28 is a sectional view taken along line NN' of FIG. 24;

FIG. 29 is a partially enlarged view of another touch display panel according to an embodiment of the present invention;

fig. 30 is a film structure diagram of a touch display device according to an embodiment of the invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

A display device with a touch function, such as a mobile phone and a tablet with a touch function, is widely used in daily life, and fig. 1 is a top view of a touch display device in the prior art, as shown in fig. 1, the touch display device in the prior art includes atouch area 11 and anon-touch area 12, and touch electrodes are disposed in thetouch area 11.

The inventor finds that, for a touch display device manufactured by adopting a mutual capacitance touch technology, the touch performance at the edge, the irregular area, the opening and the like of thetouch area 11 is often lower than the touch performance at the center of thetouch area 11. For example, the area a in fig. 1 is located at one corner of thetouch area 11 as shown in fig. 1, and the inventor finds that the touch performance of the area a is lower than that of the center of the touch display device.

The inventors have found the above-mentioned problems and then have tried to analyze the causes of the above-mentioned problems and have further studied them, fig. 2 is an enlarged view of the area a in fig. 1, fig. 3 is a sectional view taken along a tangent line AA' in fig. 2, as shown in fig. 2, the touch electrodes include afirst touch electrode 21 and asecond touch electrode 22, thefirst touch electrode 21 and thesecond touch electrode 22 are arranged in an array, as shown in fig. 3, the touch display panel in the prior art includes asubstrate layer 24, an insulatinglayer 25 and anelectrode layer 26, referring to fig. 2 and 3, afirst touch electrode 21 and asecond touch electrode 22 are located on theelectrode layer 26, in the first direction a, thefirst touch electrodes 21 are electrically connected to each other through theconductive portion 28, forming a touch electrode row, in the second direction b, thesecond touch electrodes 22 are electrically connected to each other through thebridge portion 27 to form a touch electrode row. In fig. 2, the first touch electrodes 21 and the second touch electrodes 22 are rhombus, when a user presses the touch display panel, the touch display panel sequentially sends transmission signals to each touch electrode row, that is, determines the abscissa of a touch point, and detects received signals of each touch electrode column, that is, determines the ordinate of the touch point, so as to determine the touch point, mutual capacitances are formed at intersections of the touch electrode rows and the touch electrode columns, for the mutual capacitance at any intersection, one plate of the mutual capacitance is two adjacent first touch electrodes 21 in the first direction a, the other plate of the mutual capacitance is two adjacent second touch electrodes 22 in the second direction b, and for the touch electrodes located at the edge of the touch area, reference may be made to the touch electrode row at the bottom in fig. 2, since the edge area is not fully covered with touch electrodes, a plurality of blank areas 29 are left, for the mutual capacitance formed at the intersection of the touch electrode row and the touch electrode column, one plate of the mutual capacitance is two adjacent first touch electrodes 21 in the first direction a, and the other plate is only composed of one second touch electrode 22, that is, compared with the mutual capacitance in the central region, the relative area between the two plates of the mutual capacitance is reduced, because the capacitance value of the mutual capacitance is proportional to the relative area of the two plates, the capacitance value of the mutual capacitance at the edge of the touch region is smaller than that of the mutual capacitance at the center. The capacitance value of the mutual capacitance is in direct proportion to the touch performance of the touch display panel, so the touch performance at the edge is poor, and the edge, the special-shaped area and the opening of the touch area have the problems.

After the inventor analyzes the reasons for the reduction of the touch performance at the edge, the special-shaped area, the opening and other positions of the touch display device, the inventor thinks that the reduction of the touch performance is caused by the reduction of the relative area between the two electrode plates of the mutual capacitor, and if the relative area of the first touch electrode and the first touch electrode can be increased, the capacitance value of the mutual capacitor can be increased, so as to improve the touch performance. However, the area of the touch display device is constant, and increasing the size of one of the touch electrodes necessarily reduces the size of the other touch electrodes, and the inventor further thinks that if the increased touch electrodes are not located in theelectrode layer 26, for example, an extension electrode is added between thesubstrate layer 24 and the insulatinglayer 25 as a part of thefirst touch electrode 21 and/or the second touch electrode, the relative area between thefirst touch electrode 21 and the second touch electrode 2 can be increased, that is, the capacitance value of the mutual capacitance is increased, thereby increasing the touch performance.

Fig. 4 is a top view of a touch display panel according to an embodiment of the present invention, where fig. 4 is only an example of an optional touch display panel, and does not limit the structure, shape, and size of the touch display panel of the present invention at all, the touch display panel may include atouch area 11 and anon-touch area 12, an area B is a rectangular area located at an edge of the touch area, fig. 5 is an enlarged view of the area B in fig. 4, and fig. 6 is a cross-sectional view along a tangent line BB' in fig. 5, referring to fig. 5 and fig. 6, the touch display panel of the present invention includes asubstrate layer 30, a first insulatinglayer 40, afirst touch electrode 51, asecond touch electrode 52, and afirst extension electrode 53.

Thesubstrate layer 30 may be made of a metal material, or may be made of a non-metal material, and may be a conductive material, or a non-conductive material, or may be a material with strong rigidity, or may be a flexible material, and may be selected according to specific manufacturing requirements, and optionally, thesubstrate layer 30 may be formed of a flexible insulating material. For example, thesubstrate layer 30 may be formed of a polymer material such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, or glass fiber reinforced plastic.

Referring to fig. 6, the first insulatinglayer 40 is disposed on one side of thesubstrate layer 30 and is made of an insulating material, optionally, the first insulatinglayer 40 covers the entire upper surface of thesubstrate layer 30, the first insulatinglayer 40 may be made of an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide or aluminum nitride, or an organic material such as acryl, polyimide or polyester, and the first insulatinglayer 40 may be a single layer or a plurality of layers. The first insulatinglayer 40 may block diffusion of oxygen, water molecules, and impurities toward thesubstrate layer 30, and provide a flat surface on an upper surface of thesubstrate layer 30. Optionally, the first insulatinglayer 40 is made of an insulating material with good toughness.

With continued reference to fig. 5 and fig. 6, the touch electrodes of the touch display panel include afirst touch electrode 51 and asecond touch electrode 52. Wherein, the first touch electrode 51 and the second touch electrode 52 are both located on a side of the first insulating layer 40 away from the substrate layer 30, and the first touch electrode 51 and the second touch electrode 52 are arranged in an insulating manner, the first touch electrode 51 and the second touch electrode 52 are made of a conductive material, for example, indium tin oxide or a metal, in some optional embodiments, the first touch electrode 51 and the second touch electrode 52 may be arranged in an array as shown in fig. 5 and uniformly distributed on the display panel, optionally, in the first direction a, the first touch electrodes 51 located on the same straight line may be electrically connected to each other to form a plurality of touch electrode rows extending along the first direction a and arranged along the second direction b, in the second direction b, the second touch electrodes 52 located on the same straight line may be electrically connected to each other to form a plurality of touch electrode columns extending along the second direction b and arranged along the first direction a, when a user performs touch operation, the display panel sequentially releases transmission signals to each touch electrode row, namely, determines the horizontal coordinates of touch points, and each touch electrode column receives detection signals and determines the touch electrode column with the changed mutual capacitance value, namely, determines the vertical coordinates of the touch points, so as to determine the specific touch points of the user. The method for detecting a touch location is provided as an optional embodiment, and is not limited in any way. In addition, thefirst touch electrode 51 and thesecond touch electrode 52 may be disposed on the same layer as shown in fig. 6, or may not be disposed on the same layer, and the manner of disposing the touch electrodes in fig. 6 is only an example, and does not limit the manner of disposing the touch electrodes in the present invention.

With reference to fig. 5 and fig. 6, thefirst extension electrodes 53 are located on one side of thesubstrate layer 30 close to the first insulatinglayer 40, eachfirst extension electrode 53 has afirst electrode 51A corresponding to thefirst extension electrode 53, thefirst electrode 51A is anyfirst touch electrode 51, thefirst extension electrodes 53 and thefirst touch electrodes 51 are insulated and disposed in different layers, and a projection of thefirst extension electrodes 53 on thesubstrate layer 30 and a projection of thefirst electrodes 51A on thesubstrate layer 30 at least partially overlap. Meanwhile, the first extension electrode 53 is electrically connected to the second electrode 52A, the second electrode 52A is any one of the second touch electrodes 52, and the projection of the first electrode 51A on the substrate layer 30 is adjacent to the projection of the second electrode 52A on the substrate layer 30, that is, the first extension electrode 53 is electrically connected to the second electrode 52A as a whole, and the two electrodes form a second touch electrode with a size larger than that of the second electrode 52A, the capacitance value of the mutual capacitance formed between the first electrode 51A and the second electrode 52A is proportional to the relative area between the two, and by increasing the first extension electrode 53 electrically connected to the second electrode 52A, the relative area between the second electrode 52A and the first electrode 51A is increased, that is, the capacitance value of the mutual capacitance is increased, so that the touch sensitivity is increased, and the touch performance is improved, optionally, the first electrode 51A and/or the second electrode 52A are located at the edge of the touch display panel, The capacitance values of mutual capacitors at the positions such as the special-shaped area and the opening are often smaller than the capacitance value of the mutual capacitor at the central area of the touch display panel, so that the touch performance of each area of the touch display panel is inconsistent, the first extension electrode 53 and the second electrode 52A are electrically connected to improve the capacitance value of the mutual capacitor, the uniformity of the touch performance can be optimized, the touch performance difference of different sites on the touch display panel is reduced, and the user experience is improved. It should be noted that thefirst extension electrode 53 may also be located on a side of thefirst touch electrode 51 away from the substrate layer, and is insulated from the first touch electrode by a different layer, any first extension electrode has a first electrode corresponding to the first extension electrode, a projection of the first extension electrode on the substrate layer is at least partially overlapped with a projection of the first electrode on the substrate layer, and the first electrode is any first touch electrode; the first extension electrode is electrically connected with the second electrode, the second electrode is any one of the second touch electrodes, and the projection of the first electrode on the substrate layer is adjacent to the projection of the second electrode on the substrate layer. The relative area between thesecond electrode 52A and thefirst electrode 51A is increased, that is, the capacitance value of the mutual capacitance is increased, so that the touch sensitivity is increased, and the touch performance is improved.

In the touch display panel adopting the mutual capacitance type touch technology, in the embodiment of the invention, thefirst extension electrode 53 which is not on the same layer as thefirst electrode 51A is arranged, and thefirst extension electrode 53 is electrically connected with thesecond electrode 52A, so that thefirst extension electrode 53 is used as a part of thesecond electrode 52A, thereby increasing the relative area of thefirst electrode 51A and thesecond electrode 52A, namely increasing the capacitance value of the mutual capacitance for detecting the touch signal, improving the touch sensitivity, and improving the user experience.

Further, in some optional embodiments, fig. 7 is a partially enlarged view of a touch display panel in an embodiment of the present invention, fig. 8 is a sectional view taken along a tangent line CC 'in fig. 7, and fig. 9 is a sectional view taken along a tangent line DD' in fig. 7, please refer to fig. 7, 8 and 9, the touch display panel in the embodiment may further include asecond extension electrode 54. Thesecond extension electrode 54 and thesecond touch electrode 52 are disposed in a different insulating layer and electrically connected to thefirst electrode 51A, a projection of thesecond extension electrode 54 on thesubstrate layer 30 and a projection of thesecond electrode 52A on thesubstrate layer 30 at least partially overlap, in this embodiment, thefirst extension electrode 53 is electrically connected to thesecond electrode 52A, and thesecond extension electrode 54 is electrically connected to thefirst electrode 51A, so that a mutual capacitance for characterizing a touch signal includes: a capacitance between thefirst electrode 51A and thesecond electrode 52A, a capacitance between thefirst electrode 51A and thefirst extension electrode 53, a capacitance between the second electrode and thesecond extension electrode 54, and a capacitance between thefirst extension electrode 53 and thesecond extension electrode 54. Before thefirst extension electrode 53 and thesecond extension electrode 54 are not arranged, thefirst electrode 51A and thesecond electrode 52A form two electrode plates of a mutual capacitor, and by arranging thefirst extension electrode 53 and thesecond extension electrode 54, the relative area between two substrates of the mutual capacitor is increased, namely the capacitance value of the mutual capacitor is increased, the touch performance is further improved, and the touch sensitivity is improved.

Alternatively, the first touch electrode and the second touch electrode may not be disposed on the same layer, and the first electrode and the second electrode may not be disposed on the same layer, fig. 10 is a partially enlarged view of a touch display panel according to an embodiment of the present invention, fig. 11 is a cut view along a cut line EE 'in fig. 10, please refer to fig. 10 and 11, the first electrode 51A and the second extension electrode 54 are disposed on the same layer, and are located on a side of the first insulating layer 40 away from the substrate layer 30, the second insulating layer 40' is disposed on a side of the first electrode 51A and the second extension electrode 54 away from the substrate layer 30, the second electrode 52A and the first extension electrode 53 are disposed on a side of the second insulating layer 40 'away from the substrate layer 30, the first electrode 51A and the second electrode 52A are disposed on two sides of the second insulating layer 40', respectively, when the touch display panel is manufactured by using the photolithography mask process, the difficulty of designing a mask pattern is reduced, and because the first extension electrode 53 and the second extension electrode 54 are located on two sides of the second insulating layer 40', the problem of insulation between the first extension electrode 53 and the second extension electrode 54 is not needed to be worried about, and short circuit is not easy to occur between the first extension electrode 53 and the second extension electrode 54.

Further, in an embodiment, fig. 12 is a partially enlarged view of a touch display panel in an embodiment of the invention, and fig. 13 is a schematic perspective view of a region P in fig. 12, as shown in fig. 12 and fig. 13, the first touch electrode, the second touch electrode, thefirst extension electrode 53, and thesecond extension electrode 54 are all grid electrodes, for example, metal grid electrodes may be formed by metal preparation, and the grid electrodes are disposed on a side of the touch display panel close to a user. It should be noted that the shape and size of the grid in the drawings are only used for schematically showing the structure of the grid electrode, and do not constitute a limitation to the present invention. Thefirst electrode 51A is any one of the first touch electrodes, in the first direction a, thesecond electrode 52A is adjacent to thefirst electrode 51A, in a direction perpendicular to the substrate layer, that is, in the third direction c, thefirst extension electrode 53 and thefirst electrode 51A are at least partially overlapped, thesecond extension electrode 54 and thesecond electrode 52A are at least partially overlapped, thefirst extension electrode 53 is electrically connected to thesecond electrode 52A, and thesecond extension electrode 54 is electrically connected to thefirst electrode 51A.

With the embodiment, on one hand, compared with the first electrode 51A and the second electrode 52A in the prior art, by adding the first extension electrode 53 and the second extension electrode 54, in the third direction c, the first extension electrode 53 and the first electrode 51A form a mutual capacitance, and the second extension electrode 54 and the second electrode 52A form a mutual capacitance, which is equivalent to increasing the relative area between the mutual capacitance touch electrodes, that is, increasing the capacitance value of the mutual capacitance for detecting the touch signal, improving the touch sensitivity, and improving the user experience; in the second aspect, the projection area of the grid electrode on the substrate layer is small, and the light output quantity of the touch display panel cannot be obviously influenced; in the third aspect, the metal grid electrode has small load, which is beneficial to improving the sensitivity of the touch detection signal; in the fourth aspect, in the third direction c, the coupling capacitance between the metal mesh electrodes is small, that is, the coupling capacitance between the first extended electrode 53 and the first electrode 51A that are at least partially overlapped in the third direction c is small, and the coupling capacitance between the second extended electrode 54 and the second electrode 52A that are at least partially overlapped in the third direction c is small, so that the touch performance is improved.

Further, in an embodiment, as shown in fig. 7 to 9, thefirst touch electrode 51, thesecond touch electrode 52, thefirst extension electrode 53 and thesecond extension electrode 54 are block electrodes, for example, the block electrodes may be made of ito, and at this time, an out-cell process may be used to make the touch electrode of the touch display panel and the array substrate respectively, and then the touch electrode is externally connected to the array substrate, so as to improve the production efficiency.

For the touch display panel in which the first touch electrode, the second touch electrode, the first extension electrode, and the second extension electrode are block electrodes, further, in some alternative embodiments, fig. 14 is a partially enlarged view of the touch display panel in an embodiment of the present invention, and fig. 15 is a sectional view taken along a tangent line FF' in fig. 14, as shown in fig. 14 and fig. 15, afirst opening 55 is disposed inside thefirst electrode 51A, and a projection of thefirst opening 55 on thesubstrate layer 30 covers a projection of thefirst extension electrode 53 on thesubstrate layer 30. For the block-shaped electrodes, besides forming mutual capacitance, a coupling capacitance is formed between thefirst extension electrode 53 and thefirst electrode 51A, and the coupling capacitance will interfere with the touch performance of the touch display panel, and in a direction perpendicular to thesubstrate layer 30, that is, in the third direction c, an overlapping area of thefirst extension electrode 53 and thefirst electrode 51A is proportional to a capacitance value of the coupling capacitance, so in this embodiment, thefirst opening 55 is disposed inside thefirst electrode 51A, and thefirst opening 55 covers thefirst extension electrode 53 in a direction perpendicular to thesubstrate layer 30, so that the capacitance value of the coupling capacitance is reduced, that is, the interference of the coupling capacitance to the touch performance is reduced, and the user experience is improved.

Further, in some optional embodiments, fig. 16 is a partially enlarged view of another touch display panel in the embodiments of the present disclosure, fig. 17 is a sectional view taken along a tangent line GG 'in fig. 16, and fig. 18 is a sectional view taken along a tangent line HH' in fig. 16. Referring to fig. 16, 17 and 18, in the present embodiment, afirst opening 55 is disposed inside thefirst electrode 51A, asecond opening 56 is disposed inside thesecond electrode 52A, a projection of thefirst opening 55 on thesubstrate layer 30 covers a projection of thefirst extension electrode 53 on thesubstrate layer 30, and a projection of thesecond opening 56 on thesubstrate layer 30 covers a projection of thesecond extension electrode 54 on thesubstrate layer 30. The coupling capacitance between thefirst electrode 51A and thefirst extension electrode 53 is reduced, and the coupling capacitance between thesecond electrode 52A and thesecond extension electrode 54 is reduced, so that the influence of the coupling capacitance on the touch performance of the touch display panel is further reduced.

Further, in some optional embodiments, fig. 19 is a partially enlarged view of another touch display panel in the embodiments of the present invention, and fig. 20 is a schematic perspective view of a region Q in fig. 19, please refer to fig. 19 and fig. 20, a firstauxiliary electrode 57 is disposed in thefirst opening 55, the firstauxiliary electrode 57 and thefirst touch electrode 51 are disposed in a same layer in an insulating manner, a secondauxiliary electrode 58 is disposed in thesecond opening 56, and the secondauxiliary electrode 58 and thesecond touch electrode 52 are disposed in a same layer in an insulating manner.

With the touch display panel provided in this embodiment, the openings are provided on the first electrode 51A and the second electrode 52A, which can reduce the coupling capacitance between the first electrode 51A and the second electrode, however, after the openings are provided, because there is one layer of electrode material at the opening positions, the luminous fluxes of the light rays emitted from the display device through the opening positions and the non-opening positions affect the uniformity of the display device, by providing the first auxiliary electrode 57 and the second auxiliary electrode 58 in the openings, the lack of electrode material at the opening positions is supplemented, so that the luminous fluxes of the light rays emitted from the display device through the opening positions and the non-opening positions are consistent, which can improve the uniformity of the display device, and the first extension electrode 53 is provided below the first auxiliary electrode 57, the second extension electrode 54 is provided below the second auxiliary electrode 58, because there is no signal transmission on the first auxiliary electrode 57 and the second auxiliary electrode 58, therefore, no coupling capacitance is generated between the first extension electrode 53 and the first auxiliary electrode 57, and no coupling capacitance is generated between the second extension electrode 54 and the second auxiliary electrode 58, so as to further reduce the influence of the coupling capacitance on the touch performance of the touch display panel.

Further, in some optional embodiments, fig. 21 is a partially enlarged view of another touch display panel in the embodiments of the present invention, fig. 22 is a sectional view taken along a tangent line JJ 'in fig. 21, and fig. 23 is a sectional view taken along a tangent line KK' in fig. 22, please refer to fig. 21, fig. 22 and fig. 23, thefirst touch electrode 51 and thesecond touch electrode 52 are located on the firstconductive layer 50, the firstconductive layer 50 is located on a side of the first insulatinglayer 40 away from thesubstrate layer 30, that is, thefirst touch electrode 51 and thesecond touch electrode 52 are located on the same layer, optionally, thefirst extension electrode 53 and thesecond extension electrode 54 are located on the secondconductive layer 60, and the secondconductive layer 60 is located between thesubstrate layer 30 and the first insulatinglayer 40.

Further, in some optional embodiments, fig. 24 is a partially enlarged view of another touch display panel in the embodiments of the present invention, fig. 25 is a sectional view taken along a tangent line LL ' in fig. 24, fig. 26 is a perspective view of a region T in fig. 24, fig. 27 is a sectional view taken along a tangent line MM ' in fig. 24, and fig. 28 is a sectional view taken along a tangent line NN ' in fig. 24, referring to fig. 24 to fig. 26, a plurality offirst openings 55 are disposed in thefirst touch electrode 51, and a firstauxiliary electrode 57 is disposed in each of thefirst openings 55. A plurality ofsecond openings 56 are disposed in thesecond touch electrode 52, and a secondauxiliary electrode 58 is disposed in eachsecond opening 56. It should be noted that the size and shape of thefirst opening 55 and thesecond opening 56 can be set according to the size and shape of thefirst touch electrode 51 and thesecond touch electrode 52, for example, in fig. 24 of this embodiment, 4 squarefirst openings 55 are provided inside thefirst touch electrode 51, and 4 squaresecond openings 56 are provided inside thesecond touch electrode 52, but the invention is not limited thereto, and the drawings are only used for schematically describing the inventive idea.

In the first direction a, thefirst touch electrodes 51 in the same row are electrically connected to each other to form a touch electrode row, two adjacentfirst touch electrodes 51 in the touch electrode row may be electrically connected through theconductive part 591 as shown in fig. 24, and theconductive part 591 may be made of the same material as thefirst touch electrodes 51. Referring to fig. 25, two adjacentsecond touch electrodes 52 in the touch electrode row are electrically connected through abridge 592, afirst touch electrode 51 and asecond touch electrode 52 are both located on the firstconductive layer 50, the touch electrode rows extend in the first direction a and are arranged in the second direction b, and the touch electrode rows extend in the second direction b and are arranged in the first direction a. The bridgingportion 592 is disposed on the secondconductive layer 60, and the first direction a and the second direction b cross each other and are parallel to the plane of the firstconductive layer 50.

Thefirst electrode 51A is a first touch electrode in a touch area edge, an irregular area or an area adjacent to an opening of the touch display panel, in the first direction a, thesecond electrode 52A is adjacent to thefirst electrode 51A, in a direction perpendicular to a substrate layer, that is, in a third direction c, thefirst extension electrode 53 is formed by connecting a plurality of block electrodes, each block electrode overlaps with the firstauxiliary electrode 57 in onefirst opening 55 of thefirst electrode 51A, and in each block electrode of thefirst extension electrode 53, one block electrode adjacent to thesecond extension electrode 54 is electrically connected to thesecond electrode 52A; thesecond extension electrode 54 is formed by connecting a plurality of block electrodes each overlapping the secondauxiliary electrode 58 in onesecond opening 56 of thesecond electrode 52A, and one block electrode adjacent to thefirst extension electrode 53 among the block electrodes of thesecond extension electrode 54 is electrically connected to thefirst electrode 51A.

Optionally, fig. 29 is a partial enlarged view of another touch display panel in an embodiment of the invention, please refer to fig. 29, in the touch display panel provided in the invention, an opening may be only disposed inside thefirst electrode 51A and thesecond electrode 52A, and no opening is disposed on other touch electrodes, so as to simplify the process, thefirst touch electrode 51 and thesecond touch electrode 52 of the touch display panel may be diamond-shaped electrodes or electrodes with other shapes, or metal mesh electrodes, which is not limited in the invention.

The invention further provides a touch display device which comprises any one touch display panel provided by the invention. Fig. 30 is a film structure diagram of a touch display device according to an embodiment of the present invention, and referring to fig. 30, the touch display device according to the present invention may be an organic light emitting display device, and optionally, a flexible organic light emitting display device. The organic light emitting display device includes asubstrate layer 30, athin film transistor 70, an organiclight emitting diode 80, an encapsulation layer 90, a secondconductive layer 60, a first insulatinglayer 40, and a firstconductive layer 50. In the touch display device shown in fig. 30, which is an on-cell touch display device, the source of thethin film transistor 70 is connected to the data line, the gate is connected to the scan line, the drain is connected to the anode of the organiclight emitting diode 80, and thethin film transistor 70 is a switch of the organiclight emitting diode 80 and is used for controlling whether the organiclight emitting diode 80 emits light and the brightness. The organiclight emitting diode 80 may be a white light emitting diode, and implements color display by cooperating with a color filter substrate, or may be a color diode, and directly implements color display, the encapsulation layer 90 is disposed on a side of the organic light emitting diode away from thesubstrate layer 30, and the encapsulation layer 90 may include an inorganic layer and an organic layer stacked in a staggered manner, so as to protect other film layers and prevent corrosion by oxygen and water. The secondconductive layer 60 is used to dispose a bridge, and the firstconductive layer 50 is used to dispose a first touch electrode and a second touch electrode. It should be noted that thefirst extension electrode 53 may also be located on a side of the first touch electrode away from the substrate layer, and is disposed on a different layer from the first touch electrode, so that the relative area between thesecond electrode 52A and thefirst electrode 51A is increased, that is, the capacitance of the mutual capacitance is increased, thereby increasing the touch sensitivity, improving the touch performance, and at the same time, making the distance between the electrode and thethin film transistor 70 longer, reducing the influence of the electrodes in the thin film transistor, such as the source electrode and the drain electrode, on the touch performance, and further increasing the touch sensitivity.

As can be seen from the above embodiments, the touch display panel and the touch display device of the present invention achieve the following advantages:

the touch display panel and the touch display device provided by the invention adopt a mutual capacitance touch technology, and the first extension electrode which is not in the same layer as the first electrode is arranged and is electrically connected with the second electrode, so that the first extension electrode is used as a part of the second electrode, and the relative area of the first electrode and the second electrode is increased, namely, the capacitance value of mutual capacitance for detecting touch signals is increased, the touch sensitivity is improved, and the user experience is improved.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (12)

1. A touch display panel, comprising:

a substrate layer;

a first insulating layer on one side of the substrate layer;

the first touch electrode is positioned on one side, far away from the substrate layer, of the first insulating layer;

the second touch electrode is positioned on one side, far away from the substrate layer, of the first insulating layer and is arranged in an insulating way with the first touch electrode;

the first extension electrode is positioned on one side, close to the first insulating layer, of the substrate layer and is arranged on a different layer from the first touch electrode in an insulating way, or the first extension electrode is positioned on one side, far away from the substrate layer, of the first touch electrode and is arranged on a different layer from the first touch electrode in an insulating way;

any one of the first extension electrodes is provided with a first electrode corresponding to the first extension electrode, the projection of the first extension electrode on the substrate layer is at least partially overlapped with the projection of the first electrode on the substrate layer, and the first electrode is any one of the first touch electrodes; the first extension electrode is electrically connected with a second electrode, the second electrode is any one of the second touch electrodes, and the projection of the first electrode on the substrate layer is adjacent to the projection of the second electrode on the substrate layer.

2. The touch display panel according to claim 1, further comprising: a second extension electrode;

the second extension electrode and the second touch electrode are arranged in a different insulating layer and are electrically connected with the first electrode, and the projection of the second extension electrode on the substrate layer is at least partially overlapped with the projection of the second electrode on the substrate layer.

3. The touch display panel according to claim 2, wherein the first touch electrode, the second touch electrode, the first extension electrode, and the second extension electrode are all grid electrodes.

4. The touch display panel according to claim 2, wherein the first touch electrode, the second touch electrode, the first extension electrode, and the second extension electrode are block electrodes.

5. The touch display panel according to claim 2 or 4,

a first opening is formed in the first electrode, and the projection of the first opening on the substrate layer covers the projection of the first extension electrode on the substrate layer; and/or

A second opening is formed in the second electrode, and the projection of the second opening on the substrate layer covers the projection of the second extension electrode on the substrate layer.

6. The touch display panel of claim 5,

a first auxiliary electrode is arranged in the first opening, and the first auxiliary electrode and the first touch electrode are arranged in an insulating manner on the same layer;

and a second auxiliary electrode is arranged in the second opening, and the second auxiliary electrode and the second touch electrode are arranged in a same-layer insulation manner.

7. The touch display panel of claim 2, wherein the first touch electrode and the second touch electrode are located on a first conductive layer, and the first conductive layer is located on a side of the first insulating layer away from the substrate layer.

8. The touch display panel of claim 7, wherein the first and second extension electrodes are located in a second conductive layer located between the substrate layer and the first insulating layer.

9. The touch display panel of claim 8,

the first conductive layer includes: a row of touch electrodes extending in a first direction and arranged in a second direction, and a column of touch electrodes extending in the second direction and arranged in the first direction,

any one touch electrode row comprises a plurality of first touch electrodes, and two adjacent first touch electrodes in the touch electrode row are electrically connected;

any one touch electrode row comprises a plurality of second touch electrodes, two adjacent second touch electrodes in the touch electrode row are electrically connected through a bridging part, and the bridging part is positioned on the second conductive layer;

the first direction and the second direction are crossed and are parallel to the plane where the first conducting layer is located.

10. A touch display device comprising the touch display panel according to any one of claims 1 to 9.

11. The touch display device of claim 10, further comprising:

the thin film transistor is arranged on one side, close to the first insulating layer of the touch display panel, of a substrate layer of the touch display panel;

the display layer is arranged on one side, far away from the substrate layer, of the thin film transistor;

the display layer is arranged on one side, far away from the substrate layer, of the display layer, and the first insulating layer is arranged on one side, far away from the substrate layer, of the packaging layer.

12. The touch display device of claim 11,

the display layer is an organic light emitting device layer.

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