Touch display device and display terminal

Abstract

The embodiment of the invention provides a touch control display device and a display terminal, relates to the technical field of touch control, and aims to solve the problem that a touch control electrode in a touch control metal layer is easily coupled with a metal electrode in a display panel in the prior art. The touch display device comprises a display panel, a first insulating layer, a first touch metal layer, a second insulating layer and a second touch metal layer, wherein the first insulating layer is arranged on the light emitting side of the display panel; the first touch metal layer is arranged on the first insulating layer; the second insulating layer and the second touch metal layer are arranged on the first touch metal layer; a via hole is formed in the second insulating layer; the second touch metal layer is arranged on the second insulating layer and is electrically connected with the first touch metal layer through the via hole; wherein at least one of the first insulating layer and the second insulating layer comprises an organic material.

Description

Technical Field

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

[0002] A touch display device generally includes a display panel and a touch metal layer on the display panel. During use of the touch display device, the touch electrodes in the touch metal layer are easily coupled with metal electrodes (such as cathodes) in the display panel, resulting in a decrease in the signal amount and signal amount ratio in the touch metal layer. Summary of the invention

[0003] The embodiments of the present application provide a touch display device and a display terminal, which are used to solve the problem in the related art that the touch electrodes in the touch metal layer are easily coupled with the metal electrodes in the display panel.

[0004] On the one hand, an embodiment of the present application provides a touch display device, comprising: a display panel, a first insulating layer arranged on the light-emitting side of the display panel, a first touch metal layer arranged on the first insulating layer, a second insulating layer arranged on the first touch metal layer, and a second touch metal layer; the second insulating layer is provided with a via hole; the second touch metal layer is arranged on the second insulating layer and is electrically connected to the first touch metal layer through the via hole; wherein at least one of the first insulating layer and the second insulating layer includes an organic material.

[0005] In some embodiments, the first insulating layer and the second insulating layer both include an organic material.

[0006] In some embodiments, the first touch metal layer includes a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, the first direction and the second direction intersect with each other, each of the second touch electrodes includes a plurality of electrode blocks spaced apart along the second direction, and two adjacent electrode blocks in the second direction are separated by one of the first touch electrodes; the second touch metal layer includes a plurality of connection portions spaced apart from each other, and in the second direction, each of the connection portions is electrically connected to the electrode blocks located on both sides of the connection portion through at least two of the vias.

[0007] In some embodiments, the touch display device also includes a third insulating layer and a color filter layer located on a side of the second touch metal layer away from the display panel and arranged in sequence, the color filter layer includes a shading portion and a plurality of color resist blocks, the shading portion has a plurality of openings, and each color resist block is located in one of the openings.

[0008] In some embodiments, along the thickness direction of the touch display device, the distance between the cathode of the display panel and the first touch metal layer is greater than the distance between the first touch metal layer and the color filter layer.

[0009] In some embodiments, the third insulating layer includes an organic material.

[0010] In some embodiments, the second touch metal layer includes a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, the first direction and the second direction intersect with each other, each of the second touch electrodes includes a plurality of electrode blocks spaced apart along the second direction, and two adjacent electrode blocks in the second direction are separated by one of the first touch electrodes; the first touch metal layer includes a plurality of connection portions spaced apart from each other, and in the second direction, each of the connection portions is electrically connected to the electrode blocks located on both sides of the connection portion through at least two of the vias.

[0011] In some embodiments, the touch display device further includes a third insulating layer and a polarizer which are located on a side of the second touch metal layer away from the display panel and are stacked in sequence.

[0012] In some embodiments, the display panel includes a substrate, a driving circuit layer, a light-emitting device layer and a packaging layer stacked in sequence, the driving circuit layer includes a plurality of pixel driving circuits, the light-emitting device layer includes a plurality of light-emitting devices, each of the light-emitting devices includes an anode, a light-emitting layer and a cathode stacked in sequence, the anode is electrically connected to the pixel driving circuit, the anodes of the plurality of light-emitting devices are spaced apart from each other, and the cathodes of the plurality of light-emitting devices are connected to each other.

[0013] On the other hand, an embodiment of the present application further provides a display terminal, which includes the touch display device as described in any of the above embodiments.

[0014] For the touch display device provided in the embodiment of the present application, at least one of the first insulating layer and the second insulating layer includes an organic material, and the dielectric constant of the organic material is lower than that of the inorganic material, so that the coupling between the touch electrode in the touch structure layer and the cathode in the display panel can be reduced. Therefore, for the touch display device provided in the embodiment of the present application, the signal amount and the signal amount ratio in the touch electrode can be effectively improved. In addition, the organic material also has good bending properties, thereby improving the bending performance of the touch display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural diagram of a touch display device provided in some embodiments of the present application;

[0016] Figure 2 yes Figure 1 Cross-sectional view along the A-A' direction;

[0017] Figure 3 is a cross-sectional structural diagram of a touch display device provided in some embodiments of the present application;

[0018] Figure 4 is a structural diagram of a touch display device provided in some other embodiments of the present application;

[0019] Figure 5 yes Figure 4 Cross-sectional view along the B-B' direction;

[0020] Figure 6 is a cross-sectional structural diagram of a touch display device provided in some other embodiments of the present application;

[0021] Figure 7 is a cross-sectional structural diagram of a display panel according to some embodiments of the present application;

[0022] Figure 8 It is a structural diagram of a display terminal provided in some embodiments of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0024] In the description of this application, it should be understood that the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0025] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0026] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0027] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present application.

[0028] The various embodiments of the present application are similar, and features in different embodiments and / or different examples may be combined with each other.

[0029] Some embodiments of the present application provide a touch display device, such as Figures 1 to 6 As shown, the touch display device 100 includes a display panel 10 and a touch structure layer 20 located on the light-emitting side of the display panel 10. The light-emitting side of the display panel 10 is the display side of the display panel 10, that is, the display content of the display panel 10 can be viewed from the light-emitting side of the display panel 10.

[0030] The touch structure layer 20 includes a first insulating layer 21, a first touch metal layer 22, a second insulating layer 23 and a second touch metal layer 24 which are sequentially arranged in a direction away from the display panel 10. The first insulating layer 21 is arranged on the display panel 10, and the first insulating layer 21 can provide a flat surface for the first touch metal layer 22 so as to facilitate the arrangement of the first touch metal layer 22. The first touch metal layer 22 is arranged on the first insulating layer 21, and the second insulating layer 23 is arranged on the first touch metal layer 22, and a via 231 is provided on the second insulating layer 23. The second touch metal layer 24 is arranged on the second insulating layer 23 and is electrically connected to the first touch metal layer 22 through the via 231, so that the layout of the touch electrodes in the touch structure layer 20 can be completed, thereby realizing the collection of touch signals.

[0031] The touch electrodes in the touch structure layer 20 include driving electrodes and sensing electrodes arranged in the same layer and extending in mutually intersecting directions, and one of the driving electrodes and the sensing electrodes is disconnected at the position of the other. The driving electrode and the sensing electrode can be arranged in one of the first touch metal layer 22 and the second touch metal layer 24, and the other of the first touch metal layer 22 and the second touch metal layer 24 is provided with a connecting portion, and the one of the driving electrode and the sensing electrode that is disconnected is electrically connected to the connecting portion through a via 231, so that the disconnected electrode can be connected and form a continuous electrode, so as to facilitate the input or output of the signal. In addition, the driving electrode and the sensing electrode overlap at the position of the connecting portion and form a coupling capacitor. When a conductor (such as a finger) touches, the capacitance of the coupling capacitor will change. By detecting the capacitance change, the position of the touch point can be obtained.

[0032] Exemplarily, the touch display device also includes a touch chip, which is electrically connected to the drive electrode and the sensing electrode. The touch chip provides a touch drive signal to the drive electrode, and the touch chip receives a touch sensing signal from the sensing electrode. The touch chip determines the touch position of the finger by detecting the change in the touch sensing signal. When there is no finger touching, the touch sensing signal at the sensing electrode does not change; when there is a finger touching, a capacitor is formed between the finger and the drive electrode and the sensing electrode respectively, and the finger will take away a part of the charge, causing the touch sensing signal at the sensing electrode position to change. The touch position of the finger can be determined by detecting the change in the touch sensing signal at the sensing electrode.

[0033] At least one of the first insulating layer 21 and the second insulating layer 23 includes an organic material.

[0034] Compared with the related art, in which both the first insulating layer and the second insulating layer are made of inorganic materials, the dielectric constant of the inorganic materials is usually above 5.0, which easily leads to coupling between the touch electrodes in the touch metal layer and the metal electrodes (such as cathodes) in the display panel; in the touch display device 100 provided in the above embodiment of the present application, at least one of the first insulating layer 21 and the second insulating layer 23 includes an organic material, and the dielectric constant of the organic material is lower than that of the inorganic material, which can reduce the coupling between the touch electrodes in the touch structure layer 20 and the metal electrodes (such as cathodes) in the display panel 10. Therefore, for the touch display device 100 provided in the embodiment of the present application, the signal amount and the signal amount ratio in the touch electrode can be effectively improved. In addition, the organic material also has good bending properties, thereby improving the bending performance of the touch display device 100.

[0035] In some embodiments, the first insulating layer 21 includes an organic material.

[0036] On the one hand, organic materials have a relatively low dielectric constant, which can reduce the coupling between the touch electrode and the cathode in the display panel 10; on the other hand, the film layer where the touch electrode is located is located on the side of the first insulating layer 21 away from the display panel 10, that is, the first insulating layer 21 is located between the touch electrode and the cathode. The thickness of the film layer made of organic materials is usually greater than the thickness of the film layer made of inorganic materials, which can increase the distance between the touch electrode and the cathode, thereby reducing the coupling between the touch electrode and the cathode. In this case, the signal amount and signal amount ratio in the touch electrode can be effectively improved.

[0037] In some examples, the first insulating layer 21 may be made of an organic material with a dielectric constant less than or equal to 3.3, which is conducive to reducing the coupling effect between the touch electrode and the cathode. The organic material may be a low-temperature organic overcoating (OC) material, such as polyimide, epoxy resin, acrylic, polyester, photoresist, polyacrylate, polyamide, siloxane and other resin materials, and the present application does not limit this. As long as the organic material can achieve a dielectric constant less than or equal to 3.3, it is within the scope of consideration of the present application.

[0038] In some embodiments, the second insulating layer 23 includes an organic material.

[0039] When the touch electrode is located in the first touch metal layer 22, the second insulating layer 23 is located on a side of the touch electrode away from the display panel 10, and the touch electrode is covered by the second insulating layer 23. When the second insulating layer 23 is set to an organic material, since the organic material has a relatively low dielectric constant, it can reduce the coupling between the touch electrode and the cathode in the display panel 10.

[0040] When the touch electrode is located in the second touch metal layer 24, the second insulating layer 23 is located on the side of the touch electrode close to the display panel 10, that is, the second insulating layer 23 is located between the touch electrode and the cathode. In this way, on the one hand, the material property of the second insulating layer 23 with a lower dielectric constant can be used to reduce the coupling between the touch electrode and the cathode; on the other hand, the second insulating layer 23 can be set to have a larger thickness to increase the distance between the touch electrode and the cathode, thereby further reducing the coupling between the touch electrode and the cathode.

[0041] In some examples, the second insulating layer 23 may be made of a material with a dielectric constant less than or equal to 3.3. This is beneficial to reduce the coupling effect between the touch electrode and the cathode. Exemplarily, the material selection of the second insulating layer 23 can be set with reference to the first insulating layer 21, and will not be repeated here.

[0042] In some embodiments, the first insulating layer 21 and the second insulating layer 23 both include an organic material.

[0043] In this case, the organic material can be used to further reduce the coupling between the touch electrode and the cathode in the display panel 10, thereby further increasing the signal amount and signal amount ratio in the touch electrode, which is beneficial to saving the touch power consumption of the touch display device 100, increasing the reporting rate and improving the touch performance. In addition, the organic material also has good bending properties, and when the display panel is a flexible display panel, the touch display device 100 can have good bending properties.

[0044] For the convenience of description, the touch sensing signal received by the sensing electrode when there is no finger touch is called the reference capacitance Cm, which is also the capacitance of the coupling capacitor formed at the overlap of the driving electrode and the sensing electrode when there is no finger touch. The touch sensing signal received by the second touch electrode 202 when there is a finger touch is called the touch capacitance Cm', which is the capacitance of the coupling capacitor formed at the overlap of the first touch electrode 201 and the second touch electrode 202 when there is a finger touch. The difference between the reference capacitance Cm and the touch capacitance Cm' is recorded as △Cm, that is, △Cm=Cm-Cm'. The ratio of the difference between the reference capacitance and the touch capacitance to the reference capacitance is recorded as △Cm / Cm. The touch chip can determine the touch position by the difference △Cm between the reference capacitance Cm and the touch capacitance Cm'.

[0045] It should be noted that when the difference between the reference capacitance Cm and the touch capacitance Cm' is small, the touch chip will not be able to recognize the change of the touch sensing signal. When △Cm / Cm does not reach the detection threshold of the touch chip, the touch function of the touch structure layer 20 will fail. The detection threshold of the touch chip is determined by the performance of the touch chip, and the embodiment of the present application is not limited to this. That is to say, the ratio △Cm / Cm of the difference between the reference capacitance Cm and the touch capacitance Cm' to the reference capacitance Cm can be used to confirm the sensitivity of the touch. When the ratio △Cm / Cm of the difference between the reference capacitance Cm and the touch capacitance Cm' to the reference capacitance Cm is large, the sensitivity of the touch function is better; when the ratio △Cm / Cm of the difference between the reference capacitance Cm and the touch capacitance Cm' to the reference capacitance Cm is small, the sensitivity of the touch function is poor and may even fail.

[0046] In order to further reflect the advantages of the above embodiments of the present application, the inventors simulated the first touch display device in the related art and the touch display devices provided by some embodiments of the present application (such as the second touch display device and the third touch display device described below), wherein the film layer structures of the first touch display device, the second touch display device and the third touch display device are the same, and the difference is that the first insulating layer and the second insulating layer in the first touch display device are both made of inorganic materials, the first insulating layer in the second touch display device is made of inorganic materials, and the second insulating layer is made of organic materials, and the first insulating layer and the second insulating layer in the third touch display device are both made of organic materials. The results of the simulation are shown in the following table.

[0047]

[0048] Among them, Cm refers to the reference capacitance; Cm' refers to the touch capacitance; △Cm refers to the difference between the reference capacitance and the touch capacitance, that is, △Cm = Cm-Cm'; △Cm / Cm refers to the ratio of the difference between the reference capacitance and the touch capacitance to the reference capacitance; TX unit Cb refers to the capacitance between the driving electrode and the cathode, and RX unit Cb refers to the capacitance between the sensing electrode and the cathode. The capacitance units of the above capacitors are pico-farads (pf).

[0049] From the above data, it can be seen that for the second touch display device, after the second insulating layer is replaced by an organic layer from the inorganic layer in the first touch display device, its △Cm is relatively larger, which is more conducive to determining the touch position, and △Cm / Cm has been significantly improved, so the touch sensitivity of the second touch display device has been significantly improved. In addition, compared with the first touch display device, the TX unit Cb and RX unit Cb of the second touch display device have both been significantly reduced, which is conducive to increasing the scanning frequency, reducing noise, thereby increasing the reporting rate, and improving the touch performance of the touch display device.

[0050] In addition, for the third touch display device, after the first insulating layer and the second insulating layer are replaced by organic layers from the inorganic layers in the first touch display device, the △Cm thereof is significantly improved, which is more conducive to determining the touch position, and the △Cm / Cm is effectively improved, so the touch sensitivity of the third touch display device is significantly improved. In addition, compared with the first touch display device, the TX unit Cb and the RX unit Cb of the third touch display device are significantly reduced, which is conducive to increasing the scanning frequency, reducing noise, thereby increasing the reporting rate, and improving the touch performance of the touch display device.

[0051] In some embodiments, Figures 1 to 3 As shown, the second touch metal layer 24 includes a plurality of first touch electrodes 201 arranged along a first direction X and a plurality of second touch electrodes 202 arranged along a second direction Y, and the first direction X and the second direction Y intersect each other. For example, the angle between the first direction X and the second direction Y may be a right angle or an acute angle.

[0052] Each second touch electrode 202 includes a plurality of electrode blocks 2021 spaced apart along the second direction Y, and two adjacent electrode blocks 2021 in the second direction Y are separated by a first touch electrode 201 , wherein each first touch electrode 201 may be an integral structure.

[0053] The first touch metal layer 22 includes a plurality of connection portions 203 spaced apart from each other. In the second direction Y, each connection portion 203 is connected to electrode blocks 2021 located on both sides of the connection portion 203 through at least two via holes 231 .

[0054] By using the multiple connecting parts 203 in the first touch metal layer 22, each second touch electrode 202 can be completely connected, and the first touch electrode 201 and the second touch electrode 202 can be crossed at the position of each connecting part 203, so as to avoid short circuit between the first touch electrode 201 and the second touch electrode 202. On the other hand, since there is an overlapping area between the connecting part 203 and the first touch electrode 201 and the two are insulated from each other, a capacitor is formed between the connecting part 203 and the first touch electrode 201. When a finger touches the area, the original capacitance of the area will change, and the position of the touch point can be obtained by detecting the capacitance change.

[0055] The first touch control electrode 201 may be a driving electrode, and the second touch control electrode 202 may be a sensing electrode. Alternatively, the first touch control electrode 201 may be a sensing electrode, and the second touch control electrode 202 may be a driving electrode.

[0056] In some examples, such as Figure 1 As shown, the first touch metal layer 22 also includes a plurality of touch leads 204, some of which are electrically connected to the first touch electrode 201, and other parts of the touch leads 204 are electrically connected to the second touch electrode 202. For example, other parts of the touch leads 204 are electrically connected to an electrode block 2021 located at one end of the second touch electrode 202 in the second direction Y.

[0057] Furthermore, one end of each touch lead 204 is electrically connected to the first touch electrode 201 or the second touch electrode 202 , and the other end of the touch lead 204 is electrically connected to the touch chip, so that a touch driving signal or a touch sensing signal can be transmitted, thereby realizing the detection of the touch point position.

[0058] In some examples, the first touch electrode 201 , the second touch electrode 202 , and the connecting portion 203 are all disposed in the display area DA, and the touch lead 204 is disposed in the non-display area PA.

[0059] In some embodiments, Figure 3 As shown, the touch display device 100 further includes a third insulating layer 25 and a polarizer 32 which are sequentially arranged on the side of the second touch metal layer 24 away from the display panel 10. The third insulating layer 25 can well cover the second touch metal layer 24, thereby effectively protecting the connection portion 203 in the second touch metal layer 24.

[0060] The polarizer 32 can reduce the reflection of ambient light by the touch display device 100. The polarizer 32 has a smaller dielectric constant and a larger thickness, and is less affected in a high temperature and high humidity environment. Since the first touch electrode 201 and the second touch electrode 202 are disposed in the second touch metal layer 24 and the second touch metal layer 24 is further away from the cathode of the display panel 10 than the first touch metal layer 22, the coupling between the cathode and the touch electrode can be effectively reduced, thereby increasing the signal amount and signal amount ratio of the touch structure layer 20.

[0061] In some embodiments, Figures 4 to 6 As shown, the first touch metal layer 22 includes a plurality of first touch electrodes 201 arranged along a first direction X and a plurality of second touch electrodes 202 arranged along a second direction Y, and the first direction X and the second direction Y intersect each other. For example, the angle between the first direction X and the second direction Y may be a right angle or an acute angle.

[0062] Each second touch electrode 202 includes a plurality of electrode blocks 2021 spaced apart along the second direction Y, and two adjacent electrode blocks 2021 in the second direction Y are separated by a first touch electrode 201 , wherein each first touch electrode 201 may be an integral structure.

[0063] The second touch metal layer 24 includes a plurality of connection portions 203 spaced apart from each other. In the second direction Y, each connection portion 203 is connected to electrode blocks 2021 located on both sides of the connection portion 203 through at least two via holes 231 .

[0064] By using the multiple connecting parts 203 in the second touch metal layer 24, each second touch electrode 202 can be completely connected, and the first touch electrode 201 and the second touch electrode 202 can be crossed at the position of each connecting part 203, so as to avoid short circuit between the first touch electrode 201 and the second touch electrode 202. On the other hand, since there is an overlapping area between the connecting part 203 and the first touch electrode 201 and the two are insulated from each other, a capacitor is formed between the connecting part 203 and the first touch electrode 201. When a finger touches the area, the original capacitance of the area will change, and the position of the touch point can be obtained by detecting the capacitance change.

[0065] The first touch control electrode 201 may be a driving electrode, and the second touch control electrode 202 may be a sensing electrode. Alternatively, the first touch control electrode 201 may be a sensing electrode, and the second touch control electrode 202 may be a driving electrode.

[0066] In some examples, such as Figure 4As shown, the first touch metal layer 22 also includes a plurality of touch leads 204, some of which are electrically connected to the first touch electrode 201, and other parts of the touch leads 204 are electrically connected to the second touch electrode 202. For example, other parts of the touch leads 204 are electrically connected to an electrode block 2021 located at one end of the second touch electrode 202 in the second direction Y.

[0067] Furthermore, one end of each touch lead 204 is electrically connected to the first touch electrode 201 or the second touch electrode 202 , and the other end of the touch lead 204 is electrically connected to the touch chip, so that a touch driving signal or a touch sensing signal can be transmitted, thereby realizing the detection of the touch point position.

[0068] In some embodiments, Figure 6 As shown, the touch display device 100 further includes a third insulating layer 25 and a color filter layer 31 which are arranged on the side of the second touch metal layer 24 away from the display panel 10 and are arranged in sequence. The color filter layer 31 includes a light shielding portion 311 and a plurality of color resist blocks 312. The light shielding portion 311 has a plurality of openings, and each color resist block 312 is located in one opening. The third insulating layer 25 can form a good coverage for the second touch metal layer 24, thereby effectively protecting the connection portion 203 in the second touch metal layer 24.

[0069] The color filter layer 31 can replace the polarizer to reduce the reflection of ambient light. Compared with the polarizer, the color filter layer 31 has a lower cost, which can reduce the manufacturing cost of the touch display device 100. In addition, the color filter layer 31 is relatively thin, which is also conducive to the thinning of the touch display device 100 and improves the user experience.

[0070] In some examples, the light shielding portion 311 may be a black matrix.

[0071] In some examples, the color resist block 312 may include red color resist, green color resist and blue color resist. The color resist blocks of different colors may adjust the transmittance of light emitted by different light emitting devices in the display panel 10, thereby improving the display effect.

[0072] Generally, the color filter layer 31 (for example, the light shielding portion 311) has a relatively high dielectric constant, and is generally greater than 5. In a high temperature and high humidity environment, the dielectric constant of the color filter layer 31 is greatly affected and is easily formed as a conductor. This easily leads to coupling between the touch electrode (for example, the first touch electrode 201 or the second touch electrode 202) and the color filter layer 31, thereby affecting the touch sensitivity of the touch structure layer 20. Since the first touch electrode 201 and the second touch electrode 202 are disposed in the first touch metal layer 22 and the first touch metal layer 22 is further away from the color filter layer 31 than the second touch metal layer 24, this can effectively reduce the coupling between the color filter layer 31 and the touch electrode, thereby improving the touch sensitivity of the touch structure layer 20.

[0073] In some embodiments, Figure 6 As shown, along the thickness direction of the touch display device 100 , the distance D1 between the cathode 1313 of the display panel 10 and the first touch metal layer 22 is greater than the distance D2 between the first touch metal layer 22 and the color filter layer 31 .

[0074] Since the color filter layer 31 (for example, the light shielding portion 311) is not a conductor, a relatively small distance can be set between the color filter layer 31 and the first touch metal layer 22; and the cathode is a conductor, a relatively large distance can be set between the cathode 1313 and the first touch metal layer 22, so that the coupling effect of the color filter layer 31 and the cathode 1313 on the touch electrode in the first touch metal layer 22 can be balanced, thereby increasing the signal amount and signal ratio transmitted in the touch structure layer.

[0075] It is worth noting that when the second insulating layer 23 includes organic materials, since the second insulating layer 23 has a relatively small dielectric constant, this can effectively reduce the coupling between the color filter layer 31 and the touch electrodes in the first touch metal layer 22, thereby further improving the signal amount and signal amount ratio of the touch structure layer.

[0076] In some embodiments, the third insulating layer 25 includes an organic material.

[0077] This configuration enables the third insulating layer 25 to have a relatively small dielectric constant. The third insulating layer 25 can further reduce the coupling between the color filter layer 31 and the touch electrodes in the first touch metal layer 22 to increase the signal amount and signal ratio transmitted in the touch structure layer.

[0078] The material of the third insulating layer 25 can be set with reference to the material of the first insulating layer 21 , and the embodiment of the present application does not limit it.

[0079] In the embodiment of the present application, the first touch electrode 201 is a driving electrode, and the second touch electrode 202 is a sensing electrode. In this case, the reference capacitance Cm is the capacitance of the coupling capacitance formed at the overlap of the first touch electrode 201 and the second touch electrode 202 when there is no finger touch, and the touch capacitance Cm' is the capacitance of the coupling capacitance formed at the overlap of the first touch electrode 201 and the second touch electrode 202 when there is a finger touch.

[0080] In order to further reflect the advantages of the above embodiments of the present application, the inventors simulated the fourth touch display device in the related art and the fifth touch display device provided by some embodiments of the present application, wherein the connection portion of the fourth touch display device is located in the first touch metal layer, and the touch electrodes (including the above-mentioned first touch electrodes and second touch electrodes) are located in the second touch metal layer; the connection portion of the fifth touch display device is located in the second touch metal layer, and the touch electrodes are located in the first touch metal layer. In addition, the fourth touch display device and the fifth touch display device both include a polarizer disposed on the side of the second touch metal layer away from the display panel, and the other structures of the fourth touch display device and the fifth touch display device are the same. The results of the simulation are shown in the following table.

[0081] Touch related parameters Fourth touch display device Fifth touch display device Cm(pf) 0.7025 0.5476 Cm'(pf) 0.5939 0.4556 △Cm(pf) 0.1086 0.0920 △Cm / Cm 15％ 17％ CfTx(pf) 0.4856 0.4324 CfTx(pf) 0.5260 0.4679 TX unit Cb(pf) 12.4989 10.5679 RX unit Cb(pf) 13.4416 11.4347 LGM (<0.6) 0.1586 0.3238

[0082] Wherein, CfTx refers to the capacitance between the driving electrode and the touch object, CfRx refers to the capacitance between the sensing electrode and the touch object, LGM refers to Low Ground Mass, and LGM=△Cm / CfTx+△Cm / CfRx.

[0083] It can be seen from the above data that for the fifth touch display device, after the first touch metal layer and the second touch metal layer in the fourth touch display device are interchanged, △Cm / Cm is significantly improved, so the touch sensitivity of the fifth touch display device is significantly improved. In addition, compared with the fourth touch display device, the TX unit Cb and RX unit Cb of the fifth touch display device are significantly reduced, which is conducive to increasing the scanning frequency and reducing noise, thereby increasing the reporting rate and improving the touch performance of the touch display device. In addition, the LGM of the fifth touch display device is significantly improved, which can increase the signal amount of the weak grounding parameter of the touch display device and improve the touch performance of the touch display device.

[0084] In some embodiments, Figure 7As shown, the display panel 10 includes a substrate 11, a driving circuit layer 12, a light-emitting device layer 13 and a packaging layer 14 which are stacked in sequence, the driving circuit layer 12 includes a plurality of pixel driving circuits, the light-emitting device layer includes a plurality of light-emitting devices 131, each light-emitting device 131 includes an anode 1311, a light-emitting layer 1312 and a cathode 1313 which are stacked in sequence, the anode 1311 is electrically connected to the corresponding pixel driving circuit, the anodes 1311 of the plurality of light-emitting devices 131 are spaced apart from each other, and the cathodes 1313 of the plurality of light-emitting devices 131 are connected to each other.

[0085] Among them, the anode 1311 can inject holes, and the cathode 1313 can inject electrons. The holes and electrons recombine in the light-emitting layer 1312 to emit light, so that the corresponding light-emitting device 131 can be driven to emit light through the driving circuit in the driving circuit layer 12, thereby realizing the display of the display panel 10.

[0086] The substrate 11 may be a flexible substrate, and the material of the flexible substrate may be one of polyimide, polycarbonate, polynorbornene, polyethylene terephthalate, and the like.

[0087] like Figure 7 As shown, the pixel driving circuit 121 includes a plurality of thin film transistors TFT and at least one storage capacitor, wherein the thin film transistor TFT includes a gate metal layer GM (for forming a gate electrode 1211), a gate insulating layer GI, an active layer AL, and a source-drain metal layer SD (for forming a source electrode 1212 and a drain electrode 1213) sequentially arranged on the substrate 11. The drain electrode 1213 of the thin film transistor TFT can be electrically connected to the anode electrode 1311 of the light emitting device 131 through a via hole.

[0088] The active layer AL of the thin film transistor TFT may be made of amorphous silicon, single crystal silicon, polycrystalline silicon or oxide semiconductor. The active layer AL includes a channel region not doped with impurities and a source region and a drain region formed by doping impurities on both sides of the channel region.

[0089] In some examples, such as Figure 7 As shown, the display panel 10 further includes a planar layer 122 disposed between the thin film transistor TFT and the anode 1311, and a pixel defining layer 123 disposed on the side of the anode 1311 away from the substrate 11. The pixel defining layer 123 includes a plurality of opening areas, and a retaining wall disposed around each opening area. A light emitting device 131 is disposed in an opening area, and the anodes 1311 and the light emitting layers 1312 of adjacent light emitting devices 131 are separated by the retaining wall of the pixel defining layer 123, and the cathodes 1313 of each light emitting device 131 are connected as a whole, that is, the cathode 1313 is a whole layer.

[0090] The encapsulation layer 14 can encapsulate multiple light-emitting devices 13 to ensure stable operation of the light-emitting devices 13. In some examples, the encapsulation layer 14 includes at least one layer of encapsulation film. For example, the encapsulation layer 14 may include three layers of encapsulation films stacked in sequence. The material of the encapsulation film located in the middle layer may be an organic material, while the material of the encapsulation films located on both sides may be an inorganic material. The inorganic material may be one or more of silicon nitride, silicon oxide, or silicon oxynitride.

[0091] Some embodiments of the present application also provide a display terminal, such as Figure 8 As shown, the display terminal 200 includes the touch display device 100 described in any one of the above embodiments.

[0092] Since the display terminal includes the touch display device 100 , it has all the technical effects of the above-mentioned touch display device 100 , which will not be described in detail here.

[0093] like Figure 8 As shown, the display terminal 200 may further include a terminal body 210 , and the touch display device 100 may be fixed on the terminal body 210 .

[0094] The display terminal 200 may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like.

[0095] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A touch display device, characterized in that: include: Display panel; A first insulating layer, disposed on the light-emitting side of the display panel; A first touch metal layer, disposed on the first insulating layer; A second insulating layer is disposed on the first touch metal layer, and a via hole is formed in the second insulating layer; as well as A second touch metal layer, disposed on the second insulating layer and electrically connected to the first touch metal layer through the via hole; At least one of the first insulating layer and the second insulating layer includes an organic material.

2. The touch display device according to claim 1, characterized in that: The first insulating layer and the second insulating layer each include an organic material.

3. The touch display device according to claim 1 or 2, characterized in that: The first touch metal layer includes a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, the first direction and the second direction intersect each other, the second touch electrodes include a plurality of electrode blocks arranged at intervals along the second direction, and two adjacent electrode blocks in the second direction are separated by one of the first touch electrodes; The second touch metal layer includes a plurality of connection parts spaced apart from each other. In the second direction, each of the connection parts is electrically connected to the electrode blocks located on both sides of the connection part through at least two of the via holes.

4. The touch display device according to claim 3, characterized in that: The touch display device also includes a third insulating layer and a color filter layer which are located on a side of the second touch metal layer away from the display panel and are arranged in sequence. The color filter layer includes a shading portion and a plurality of color resist blocks. The shading portion has a plurality of openings, and each color resist block is located in one of the openings.

5. The touch display device according to claim 4, characterized in that: Along the thickness direction of the touch display device, the distance between the cathode of the display panel and the first touch metal layer is greater than the distance between the first touch metal layer and the color filter layer.

6. The touch display device according to claim 4, characterized in that: The third insulating layer includes an organic material.

7. The touch display device according to claim 1 or 2, characterized in that: The second touch metal layer includes a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, the first direction and the second direction intersect each other, each of the second touch electrodes includes a plurality of electrode blocks arranged at intervals along the second direction, and two adjacent electrode blocks in the second direction are separated by one of the first touch electrodes; The first touch metal layer includes a plurality of connection parts spaced apart from each other. In the second direction, each of the connection parts is electrically connected to the electrode blocks located on both sides of the connection part through at least two of the via holes.

8. The touch display device according to claim 7, characterized in that: The touch display device further includes a third insulating layer and a polarizer which are located on a side of the second touch metal layer away from the display panel and are stacked in sequence.

9. The touch display device according to claim 1 or 2, characterized in that: The display panel includes a substrate, a driving circuit layer, a light-emitting device layer and a packaging layer which are stacked in sequence, the driving circuit layer includes a plurality of pixel driving circuits, the light-emitting device layer includes a plurality of light-emitting devices, each of the light-emitting devices includes an anode, a light-emitting layer and a cathode which are stacked in sequence, the anode is electrically connected to the pixel driving circuit, the anodes of the plurality of light-emitting devices are spaced apart from each other, and the cathodes of the plurality of light-emitting devices are connected to each other.

10. A display terminal, characterized in that: include: A touch display device as claimed in any one of claims 1 to 9.

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