Touch structure, manufacturing method of touch structure, touch display screen and electronic device

Abstract

The present invention provides a touch control structure, a manufacturing method of the touch control structure, a touch control display screen and an electronic device, which include a first film layer, a driving electrode layer including a plurality of driving electrodes, a first adhesive layer, a second film layer and an induction electrode layer including a plurality of induction electrodes that are stacked. A floating induction electrode is further arranged on the outer periphery of the induction electrode layer. The floating induction electrode is coupled with the driving electrode to generate an electric field in the surrounding space of the touch control structure. The electric field is used to detect and locate a conductor entering the electric field. By arranging the floating induction electrode on the outer periphery of the induction electrode layer and forming an electric field through the coupling of the driving electrode and the floating induction electrode, when a conductor such as a human finger enters the electric field, the electric field can detect and locate the human finger, and then the electric field changes. Therefore, the position of the floating touch control is determined through the change of the electric field, realizing the function of the floating touch control, and reducing the coupling distance, making the electric field stronger and improving the recognition accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of touch control, and particularly relates to a touch control structure, a manufacturing method of the touch control structure, a touch display screen and an electronic device. Background Art

[0002] With the continuous improvement of people's requirements for automotive safety, comfort, energy conservation and environmental protection performance, the status of automotive electronic devices in automobiles has been continuously improved, and the innovation of automotive electronic devices has become a key factor in the innovation of the automotive industry. The Internet of Vehicles is one of the fastest-growing segments in the automotive electronic device market. Among them, the in-vehicle touch screen is an important carrier for human-machine interaction, which will drive the automobile to become the next important mobile intelligent terminal after the smart phone.

[0003] At present, the traditional touch screens equipped in most vehicle models need to be touched by fingers to complete human-machine interaction, and there are limitations in many aspects. For example, when adjusting the volume of the audio or controlling the temperature of the air conditioner, users need to reach out and touch the touch screen while staring at the touch screen to confirm whether the fingers have made correct operations. At the same time, the interior space of the vehicle is relatively large, and the position of the touch screen is far from the user. When in use, the user's body needs to make a certain displacement, which poses a certain risk to driving safety, especially during high-speed driving. For the in-vehicle touch screen with floating touch control, during the operation process, users only need to wave their arms on the touch screen and make specified gestures to achieve relevant operations, without the need for users to lower their heads to confirm whether the operations are correct, reducing the number of times users focus on the touch screen and greatly improving the driving safety factor.

[0004] At present, most of the in-vehicle touch screens on the market only have a simple touch function to control the vehicle computer; very few high-end vehicle models adopt the function of floating touch control. Among them, for the floating touch control touch screen relying on electric field induction, when recognizing gestures, there will be problems such as poor recognition accuracy and recognition errors. Summary of the Invention

[0005] The first object of the present invention is to provide a touch control structure to achieve the floating touch control function.

[0006] To achieve the first object of the present invention, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a touch control structure, including a first film layer, a driving electrode layer including a plurality of driving electrodes, a first adhesive layer, a second film layer, and an induction electrode layer including a plurality of induction electrodes, which are stacked. A floating induction electrode is further provided on the outer periphery of the induction electrode layer. The floating induction electrode is coupled with the driving electrode to generate an electric field in the surrounding space of the touch control structure, and the electric field is used to detect and locate a conductor entering the electric field.

[0008] By setting a floating induction electrode located on the outer periphery of the induction electrode layer and forming an electric field through the coupling of the driving electrode and the floating induction electrode, when a conductor, such as a human finger, enters the electric field, the electric field can detect and locate the human finger. Furthermore, the electric field changes, and thus the position of the floating touch control is determined through the change in the electric field, realizing the function of floating touch control. And because the floating induction electrode is arranged on the outer periphery of the induction electrode layer and coupled with the driving electrode, the coupling distance is reduced, making the electric field stronger and improving the recognition accuracy.

[0009] In the first possible implementation manner of the first aspect, the floating induction electrode includes a first electrode and a second electrode arranged opposite to each other. The first electrode and the second electrode are arranged on opposite sides of the induction electrode layer, and the widths of the first electrode and the second electrode are greater than the width of the induction electrode.

[0010] The wider widths of the first electrode and the second electrode can emit stronger signals, thereby forming an electric field with a larger coverage area and a farther distance, enhancing the effect of floating touch control.

[0011] Combining the first aspect and the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the first electrode includes more than 2, and more than 2 of the first electrodes are arranged in sequence along the side direction of the induction electrode layer.

[0012] By setting the first electrode to include more than 2, the electric field of the floating induction electrode is finely divided, making the position positioning more accurate.

[0013] Combining the first aspect and the first to second possible implementation manners of the first aspect, in the third possible implementation manner of the first aspect, the induction electrode layer and the driving electrode layer are arranged corresponding to each other, and the projection of the floating induction electrode on the first film layer does not overlap with the driving electrode layer.

[0014] By setting a floating induction electrode on the outer periphery of the induction electrode layer, the driving electrode 151 can be coupled with the floating induction electrode 30 to realize the function of floating touch control.

[0015] Combining the first aspect and the first to second possible implementation manners of the first aspect, in the fourth possible implementation manner of the first aspect, the induction electrode layer and the floating induction electrode and the driving electrode layer are arranged corresponding to each other, and at least part of the projection of the floating induction electrode on the first film layer overlaps with the driving electrode layer.

[0016] By setting a driving electrode layer with a larger area, the suspended sensing electrodes on the outer periphery of the sensing electrode layer can correspond to at least a part, that is, the distance between the driving electrode and the suspended sensing electrode is closer, which is more convenient for the design of the driving IC circuit, and enables the driving electrode and the suspended sensing electrode to be coupled to achieve the function of suspended touch control.

[0017] In the fifth possible implementation manner of the first aspect, it further includes a second glue layer and a cover plate which are stacked. The second glue layer is stacked on the sensing electrode layer, and a light-shielding layer is further arranged between the second glue layer and the cover plate. The position where the light-shielding layer is arranged corresponds to the outer periphery of the sensing electrode layer and is used to block the suspended sensing electrodes.

[0018] The cover plate is used to protect the touch control structure, and the light-shielding layer is used to block the suspended sensing electrodes.

[0019] The second object of the present invention is to provide a manufacturing method of a touch control structure to achieve the function of suspended touch control.

[0020] In the second aspect, the present invention provides a manufacturing method of a touch control structure, including the following steps:

[0021] Provide a first film layer, and manufacture a driving electrode layer including a plurality of driving electrodes on the first film layer;

[0022] Coat a first glue layer on the driving electrode layer;

[0023] Stack and bond a second film layer on the first glue layer;

[0024] Manufacture a sensing electrode layer including a plurality of sensing electrodes on the second film layer, and manufacture suspended sensing electrodes on the outer periphery of the sensing electrode layer.

[0025] By manufacturing suspended sensing electrodes on the outer periphery of the sensing electrode layer, an electric field can be formed through the coupling of the driving electrode and the suspended sensing electrodes, and the effect of suspended touch control can be achieved.

[0026] In the first possible implementation manner of the second aspect, the following steps are further included:

[0027] Coat a second glue layer on the sensing electrode layer;

[0028] Manufacture a light-shielding layer on the second glue layer. The position where the light-shielding layer is arranged corresponds to the outer periphery of the sensing electrode layer and is used to block the suspended sensing electrodes;

[0029] Stack and bond a cover plate on the second glue layer and the light-shielding layer.

[0030] By setting the light-shielding layer and the cover plate, the suspended sensing electrodes can be blocked, the touch control structure can be protected, and the touch control structure can be modularized, which is convenient for mass production and application.

[0031] The third object of the present invention is to provide a touch display screen.

[0032] In a third aspect, the present invention provides a touch display screen, and the touch display screen includes the touch structure in any one of the various implementation methods of the first aspect.

[0033] The fourth object of the present invention is to provide an electronic device.

[0034] In a fourth aspect, the present invention provides an electronic device, and the electronic device includes the touch structure in any one of the various implementation methods of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a schematic diagram of the stacked structure of the touch structure provided by one embodiment;

[0037] Figure 2 It is a schematic diagram of the stacked structure of the touch structure provided by another embodiment;

[0038] Figure 3 It is a schematic diagram of the planar structure of the touch structure provided by one embodiment;

[0039] Figure 4 It is a schematic diagram of the planar structure of the touch structure provided by another embodiment;

[0040] Figure 5 It is a schematic diagram of the electric field generated by the touch structure of the present invention;

[0041] Figure 6 It is a schematic diagram of the electric field change when a finger extends into the electric field. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0043] The touch structure provided by the embodiment of the present invention can be applied to various touch display screens. In addition to being applicable to the in-vehicle touch screen described in the background art, it can also be applied to electronic devices such as smart phones, tablet computers, and televisions to achieve the human-computer interaction functions of image display, touch, and floating touch of the electronic devices.

[0044] Please refer to Figure 1 and Figure 3 , Figure 1 which is a schematic diagram of the stacked structure of the touch structure provided by an embodiment. Figure 3 which is a schematic diagram of the planar structure of the touch structure provided by an embodiment. An embodiment of the present invention provides a touch structure, which includes a first film layer 11, a driving electrode layer 15 including a plurality of driving electrodes 151, a first adhesive layer 18, a second film layer 21, and a sensing electrode layer 25 including a plurality of sensing electrodes 251 that are stacked. A floating sensing electrode 30 is further provided on the outer periphery of the sensing electrode layer 25. The floating sensing electrode 30 is coupled with the driving electrode 151 to generate an electric field in the surrounding space of the touch structure, and the electric field detects and locates a conductor entering the electric field.

[0045] In this embodiment, by providing the floating sensing electrode 30 located on the outer periphery of the sensing electrode layer 25 and forming an electric field through the coupling of the driving electrode 151 and the floating sensing electrode 30, when a conductor such as a human finger enters the electric field, the electric field can detect and locate the human finger, and then the electric field changes. Thus, the position of the floating touch is determined through the change of the electric field, and the function of the floating touch is realized. Moreover, since the floating sensing electrode 30 is provided on the outer periphery of the sensing electrode layer 15 and is coupled with the driving electrode 15, the coupling distance is reduced, making the electric field stronger and improving the recognition accuracy.

[0046] In this embodiment, the first film layer 11 and the second film layer 21 can be made of PET material (polyethylene terephthalate), or can be glass. In other embodiments, the second film layer 21 may not be provided. The driving electrode layer 15 is made of ITO (indium tin oxide) material to form a film layer and a driving electrode pattern. The specific manufacturing process may include exposure, development, etching, and thin film, and then silver paste is printed on the driving electrode pattern to obtain the driving electrode 151. The first adhesive layer 18 is used to paste the driving electrode layer 15 and the second film layer 21 or the sensing electrode layer 25 (when the second film layer 21 is not provided). The first adhesive layer 18 can be an OCA adhesive (Optical Clear Adhesive). The sensing electrode layer 25 is similar to the driving electrode layer 15, and is also made of ITO (indium tin oxide) material to form a film layer and a sensing electrode pattern. The manufacturing process is the same as that of the driving electrode layer 15. Then silver paste is printed on the sensing electrode pattern to obtain the sensing electrode 251. In this embodiment, there is an extra space around the sensing electrode layer 25. Specifically, the sensing electrode layer 25 is disposed in the middle of the second film layer 21, and a manufacturing space is left at the edge position of the second film layer 21. When manufacturing the sensing electrode 251, silver paste can be printed on this manufacturing space to form the floating sensing electrode 30. In another embodiment, the sensing electrode layer 25 completely covers the second film layer 25. When manufacturing the sensing electrode pattern, the floating sensing electrode pattern can be manufactured together, and then silver paste is printed to obtain the sensing electrode 251 and the floating sensing electrode 30. Of course, the material of the floating sensing electrode 30 can also be selected as molybdenum-aluminum-molybdenum or other conductive metal materials, not limited to silver paste. As can be seen from the above description, the floating sensing electrode 30 and the sensing electrode 251 are located in the same layer structure, with a compact structure. A coupling capacitance can be formed between the floating sensing electrode 30 and the driving electrode 151, so that the driving electrode 151 can drive the floating sensing electrode 30 to form an electric field.

[0047] In this embodiment, there is at least a 3 mm distance between the floating sensing electrode 30 and the sensing electrode 251 on the sensing electrode layer 25 closest to it to ensure insulation from each other. The present invention does not limit the specific routing forms of the driving electrode 151 and the sensing electrode 251. As long as a coupling capacitance is formed between the driving electrode 151 and the sensing electrode 251 and a touch effect can be achieved. It should be understood that the touch effect formed by the coupling between the driving electrode 151 and the sensing electrode 251 is mainly the effect generated by a finger touching the display screen, and there may also be a weak floating touch effect generated when the finger moves away from the display screen.

[0048] In this embodiment, there is no limitation on the routing layout of the driving IC and the signal lines connecting the driving IC to the floating induction electrode 30, the induction electrode 251, and the driving electrode 151, which can be arranged according to the actual situation. For the modular assembly of the touch control structure, the distance between the floating induction electrode 30 and the edge of the touch control structure is not less than 0.6 mm to facilitate the setting of necessary accessories such as the border.

[0049] Please continue to refer to Figure 1 and Figure 3 , the touch control structure of this embodiment may further include a second adhesive layer 28 and a cover plate 50 arranged in a stacked manner. The second adhesive layer 28 is arranged on the induction electrode layer 25 in a stacked manner, and a light-shielding layer ( Figure 3 not shown in Figure 1 and can be referred to the reference numerals 41 and 42 shown in

[0050] In one embodiment, please continue to refer to Figure 1 and Figure 3 , the floating induction electrode 30 includes a first electrode 31 and a second electrode 32 arranged oppositely. The first electrode 31 and the second electrode 32 are arranged on opposite sides of the induction electrode layer 25, and the widths of the first electrode 31 and the second electrode 32 are greater than the width of the induction electrode 251.

[0051] Specifically, the widths of the first electrode 31 and the second electrode 32 are 4 mm to 12 mm, preferably 5 mm to 10 mm, and more preferably 7 mm to 9 mm. Generally, the width of the induction electrode 251 is at the micron (μm) level or even the nanometer (nm) level to avoid being seen when the induction electrode 251 displays an image on the display screen. The wider widths of the first electrode 31 and the second electrode 32 can emit stronger signals, thereby forming an electric field with a larger coverage area and a farther distance, enhancing the floating touch effect.

[0052] Please refer to Figure 3, the touch structure of this embodiment further includes a third electrode 33 and a fourth electrode 34 disposed on the other two opposite sides of the sensing electrode layer 25. The third electrode 33 and the fourth electrode 34 surround the sensing electrode layer 25 together with the first electrode 31 and the second electrode 32, so that the suspended sensing electrode 30 surrounds the sensing electrode layer 25, thereby forming an electric field covering the touch structure. The widths of the first electrode 31 to the fourth electrode 34 may be the same, not completely the same, or all different. Specifically, the widths of the relatively arranged first electrode 31 and second electrode 32, or the third electrode 33 and the fourth electrode 34, may be the same to make the electric field regularly distributed; further, the width between the first electrode 31 and the second electrode 32 with a relatively longer distance may be wider than the width between the third electrode 33 and the fourth electrode 34 with a relatively shorter distance, so that the intensities in all directions of the electric field tend to be consistent to better achieve the suspended touch effect.

[0053] Please refer to Figure 1 , as described above, a light-shielding layer is provided in the touch structure. Specifically, in this embodiment, the light-shielding layer includes a first light-shielding structure 41 and a second light-shielding structure 42. The first light-shielding structure 41 is disposed at the position corresponding to the first electrode 31, and the second light-shielding structure 42 is disposed at the position corresponding to the second electrode 32. One end of the first light-shielding structure 41 extends to the edge of the touch structure, and the other end extends to the edge of the sensing electrode layer 25 to completely block the first electrode 31. It can be understood that a third light-shielding structure and a fourth light-shielding structure (not shown in the figure) are also provided at the positions corresponding to the third electrode 33 and the fourth electrode 34.

[0054] In one embodiment, please refer to Figure 3 and Figure 4 , Figure 4 is a schematic plan view of a touch structure provided by another embodiment. The first electrode 31 includes more than 2. More than 2 first electrodes 31 are arranged in sequence along the side direction of the sensing electrode layer 25. Specifically, as Figure 3 shown, for convenience of description, the first electrode 31 includes 2 electrodes: an A electrode 311 and a B electrode 312. Further, as Figure 4 shown, the first electrode 31 further includes a C electrode 313 and a D electrode 314, a total of 4 electrodes. In other embodiments, the first electrode 31 may further include other numbers of electrodes. Correspondingly, the second electrode 32, the third electrode 33, and the fourth electrode 34 may also include more than 2. As Figure 3 shown, the second electrode 32 includes an electrode 321 and an electrode 322, the third electrode 33 includes an electrode 331 and an electrode 332, and the fourth electrode 34 includes an electrode 341 and an electrode 342. As Figure 4As shown, further, the second electrode 32 further includes an electrode 323 and an electrode 324, the third electrode 33 further includes an electrode 333 and an electrode 334, and the fourth electrode 34 further includes an electrode 343 and an electrode 344. By providing that the first electrode 31 to the fourth electrode 34 include more than two, the electric fields in all directions of the suspended induction electrode 30 are finely divided, making the position positioning more accurate.

[0055] In one embodiment, please refer to Figure 1 , the induction electrode layer 25 is correspondingly arranged with the driving electrode layer 15, and the projection of the suspended induction electrode 30 on the first film layer 11 does not overlap with the driving electrode layer 15. Preferably, the projection of the induction electrode layer 25 on the first film layer 11 coincides with that of the driving electrode layer 15. That is to say, in this embodiment, on the basis of the existing conventional touch structure, by arranging the suspended induction electrode 30 on the outer periphery of the induction electrode layer 25 and appropriately modifying the circuit of the driving IC, the driving electrode 151 can be coupled with the suspended induction electrode 30 to realize the function of suspended touch. The circuit structure of the driving IC is not limited in this embodiment.

[0056] In one embodiment, please refer to Figure 2 , Figure 2 is a schematic diagram of the stacked structure of a touch structure provided by another embodiment. The induction electrode layer 25 and the suspended induction electrode 30 are correspondingly arranged with the driving electrode layer 15'. At least part of the projection of the suspended induction electrode 30 on the first film layer 11 overlaps with the driving electrode layer 15'. In this embodiment, by providing a driving electrode layer 15' with a larger area, at least a part of the suspended induction electrode 30 on the outer periphery of the induction electrode layer 25 can be corresponded, that is, the distance between the driving electrode 151' and the suspended induction electrode 30 is closer, which is more convenient for the design of the circuit of the driving IC, and enables the driving electrode 151' to be coupled with the suspended induction electrode 30 to realize the function of suspended touch.

[0057] Please refer to Figure 1 and Figure 3 , an embodiment of the present invention also provides a manufacturing method of a touch structure, including the following steps:

[0058] Provide a first film layer 11, and fabricate a driving electrode layer 15 including a plurality of driving electrodes 151 on the first film layer 11; coat a first adhesive layer 18 on the driving electrode layer 15; stack and bond a second film layer 21 on the first adhesive layer 18; fabricate an induction electrode layer 25 including a plurality of induction electrodes 251 on the second film layer 21, and fabricate a suspended induction electrode 30 on the outer periphery of the induction electrode layer 25.

[0059] In this embodiment, by fabricating the floating induction electrode 30 on the outer periphery of the induction electrode layer 25, an electric field can be formed through the coupling between the driving electrode 151 and the floating induction electrode 30, thereby achieving the effect of floating touch control.

[0060] In one embodiment, please refer to Figure 1 and Figure 3 , and the steps are as follows:

[0061] Coat a second adhesive layer 28 on the induction electrode layer 25;

[0062] Fabricate a light-shielding layer on the second adhesive layer 28, and the position where the light-shielding layer is provided corresponds to the outer periphery of the induction electrode layer 25 for shielding the floating induction electrode 30;

[0063] Stack and bond a cover plate 50 on the second adhesive layer 28 and the light-shielding layer.

[0064] By providing the light-shielding layer and the cover plate 50, the floating induction electrode 30 can be shielded, the touch control structure can be protected, and the touch control structure can also be modularized, facilitating mass production and application.

[0065] Please refer to Figure 5 , Figure 5 is a schematic diagram of the electric field generated by the touch control structure of the present invention. When the touch control structure of the present invention is in use, an outwardly radiating electric field is generated. Figure 5 The arrowed lines extending outward from the touch control structure shown in Figure 6 represent electric field lines. Please refer to Figure 6 , Figure 6 is a schematic diagram of the electric field change when a finger extends into the electric field. When a finger extends into the electric field, since the finger is a conductor, it can couple with the touch control structure of the present invention to cause a change in the electric field.

[0066] The above-disclosed is only a preferred embodiment of the present invention. Of course, the scope of rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A touch structure, characterized in that, it includes a first film layer, a driving electrode layer including a plurality of driving electrodes, a first adhesive layer, a second film layer, and an induction electrode layer including a plurality of induction electrodes that are stacked. A floating induction electrode is further provided on the outer periphery of the induction electrode layer. The floating induction electrode is coupled with the driving electrode to generate an electric field in the surrounding space of the touch structure, and the electric field is used to detect and locate a conductor entering the electric field; the floating induction electrode includes a first electrode and a second electrode that are oppositely arranged. The first electrode and the second electrode are arranged on opposite sides of the induction electrode layer, and the widths of the first electrode and the second electrode are greater than the width of the induction electrode; there are more than 2 first electrodes, and more than 2 first electrodes are arranged in sequence along the side direction of the induction electrode layer; the touch structure further includes a second adhesive layer and a cover plate that are stacked. The second adhesive layer is stacked on the induction electrode layer, and a light-shielding layer is further provided between the second adhesive layer and the cover plate. The position where the light-shielding layer is provided corresponds to the outer periphery of the induction electrode layer and is used to block the floating induction electrode.

2. The touch structure according to claim 1, characterized in that, the induction electrode layer is correspondingly arranged with the driving electrode layer, and the projection of the floating induction electrode on the first film layer does not overlap with the driving electrode layer.

3. The touch structure according to claim 1, characterized in that, the induction electrode layer and the floating induction electrode are correspondingly arranged with the driving electrode layer, and at least part of the projection of the floating induction electrode on the first film layer overlaps with the driving electrode layer.

4. A manufacturing method of a touch structure, applied to the touch structure according to any one of claims 1 to 3, characterized in that, it includes the following steps: providing a first film layer and manufacturing a driving electrode layer including a plurality of driving electrodes on the first film layer; coating a first adhesive layer on the driving electrode layer; stacking and laminating a second film layer on the first adhesive layer; manufacturing an induction electrode layer including a plurality of induction electrodes on the second film layer, and manufacturing a floating induction electrode on the outer periphery of the induction electrode layer.

5. The manufacturing method of the touch structure according to claim 4, characterized in that, it further includes the following steps: coating a second adhesive layer on the induction electrode layer; manufacturing a light-shielding layer on the second adhesive layer, and the position where the light-shielding layer is provided corresponds to the outer periphery of the induction electrode layer and is used to block the floating induction electrode; stacking and laminating a cover plate on the second adhesive layer and the light-shielding layer.

6. A touch display screen, characterized in that, it includes the touch structure according to any one of claims 1 to 3.

7. An electronic device, characterized in that, it includes the touch structure according to any one of claims 1 to 3.

Images