Tactile feedback module and display device

Abstract

The embodiment of the invention provides a tactile feedback module and a display device, and relates to the technical field of display, the tactile feedback module comprises a substrate, a piezoelectric layer and a touch substrate, the piezoelectric layer and the touch substrate are sequentially arranged on one side of the substrate in a stacked mode, and the piezoelectric layer is arranged close to the substrate; the touch substrate comprises a plurality of pressing units arranged in an array mode, and each pressing unit comprises a pressing platform located in the center of the pressing unit and a plurality of elastic structures arranged on the periphery of the pressing platform and connected with the pressing platform. The plurality of elastic structures and the pressing platform are symmetrically arranged about the center of the pressing unit; in the strain state, the elastic structure deforms in the direction close to the piezoelectric layer, the pressing platform and the piezoelectric layer form planar contact, and the strain state is the state when the touch substrate is subjected to prestress.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular, to a tactile feedback module and a display device. Background Art

[0002] With the development of technology, touch screens have been used more and more widely and have gradually become one of the most convenient human-computer interaction devices. Therefore, tactile feedback (Haptics) is the focus of current technological development. Specifically, tactile feedback can enable the terminal to interact with the human body through touch. Tactile feedback includes vibration feedback, that is, when the touch substrate triggers the driving signal, the piezoelectric driver generates vibration, thereby driving the substrate to vibrate. This process realizes tactile feedback. As virtual buttons replace physical buttons, tactile feedback has become an important function on display devices.

[0003] However, in the existing solutions, the central pressing plane of the pressing unit is not horizontal during the pressing process, and the contact area with the electroactive layer is small, which will cause "tip contact" during pressing. When a large amount of charge is accumulated, it is easy to cause tip discharge, affecting product safety and quality. Therefore, how to increase the contact area between the pressing unit and the electroactive layer and improve product safety and quality has become an urgent problem to be solved in this field. Summary of the invention

[0004] The embodiments of the present application provide a tactile feedback module and a display device, aiming to solve the problem of how to increase the contact area between the pressing unit and the electroactive layer, thereby improving product safety and quality.

[0005] A first aspect of an embodiment of the present application provides a tactile feedback module, the tactile feedback module comprising:

[0006] A base substrate, and a piezoelectric layer and a touch substrate stacked in sequence on one side of the base substrate, wherein the piezoelectric layer is arranged close to the base substrate;

[0007] The touch substrate includes a plurality of pressing units arranged in an array, the pressing unit includes a pressing platform located at the center of the pressing unit, and a plurality of elastic structures arranged around the pressing platform and connected to the pressing platform, the plurality of elastic structures and the pressing platform are symmetrically arranged about the center of the pressing unit;

[0008] In the strain state, the elastic structure is deformed in a direction close to the piezoelectric layer, and the pressing platform forms a planar contact with the piezoelectric layer. The strain state is a state in which the touch substrate is subjected to prestress.

[0009] In an optional embodiment, each of the elastic structures includes a plurality of U-shaped substructures extending along the first direction, and adjacent U-shaped substructures are connected to each other;

[0010] In the second direction, the lengths of the multiple U-shaped substructures along the first direction gradually decrease. The first direction is the extension direction of the edge of the pressing unit close to the elastic structure, and the second direction is the direction of the edge of the pressing unit close to the elastic structure pointing to the pressing platform.

[0011] In an optional embodiment, in a natural state, there is no contact between the pressing platform and the piezoelectric layer, and a distance between a surface of the pressing platform close to the piezoelectric layer and the piezoelectric layer is less than or equal to a thickness of the touch substrate. The natural state is a state in which the touch substrate is not subjected to prestress.

[0012] In an optional embodiment, the pressing unit includes a first dividing line and a second dividing line that are perpendicular to each other, the first dividing line and the second dividing line intersect to form a plurality of sub-areas, and the plurality of elastic structures are respectively arranged in the plurality of sub-areas.

[0013] In an optional implementation, in the same sub-region, the end point of the elastic structure close to the pressing platform is connected to the vertex of the pressing platform, or,

[0014] In the same sub-region, an end point of the elastic structure close to the pressing platform is connected to a midpoint of an edge of the pressing platform.

[0015] In an optional implementation, in the same sub-region, the elastic structure is connected to the pressing platform along the direction of the first dividing line or the second dividing line, or,

[0016] In the same sub-region, the elastic structure is connected to the pressing platform along the direction of the central axis of the sub-region.

[0017] In an optional implementation, the shape of the pressing platform is the same as that of the pressing unit, and in each of the sub-regions, the pressing platform is arranged parallel to adjacent edges of the pressing unit.

[0018] In an optional implementation, the pressing platform and the pressing unit are squares, and the first dividing line and the second dividing line are respectively straight lines where the diagonal lines of the pressing unit are located.

[0019] In an optional implementation, the pressing platform and the pressing unit are circular, and the first dividing line and the second dividing line are respectively straight lines where the diameter of the pressing unit is located.

[0020] In an optional embodiment, the piezoelectric layer includes:

[0021] Piezoelectric elements;

[0022] An electrode layer, the electrode layer is disposed between the touch substrate and the piezoelectric element, the electrode layer includes a plurality of electrode patterns arranged in an array, and the orthographic projection of the electrode pattern on the base substrate is located inside the orthographic projection of the piezoelectric element on the base substrate;

[0023] The orthographic projection of the electrode pattern on the base substrate at least partially overlaps with the orthographic projection of the pressing unit on the base substrate, the orthographic projection area of ​​the electrode pattern on the base substrate is greater than or equal to the orthographic projection area of ​​the pressing unit on the base substrate, and in the strain state, the pressing platform forms a planar contact with the electrode pattern.

[0024] In an optional implementation, an orthographic projection of the pressing unit on the base substrate coincides with an orthographic projection of the electrode pattern on the base substrate.

[0025] In an optional embodiment, the electrode pattern includes a central pattern and a first peripheral pattern surrounding the central pattern;

[0026] The orthographic projection of the pressing unit on the base substrate coincides with the orthographic projection of the central pattern on the base substrate, and the width of the first peripheral pattern is slightly smaller than half of the width of the interval between two adjacent pressing units.

[0027] In an optional embodiment, the electrode pattern includes a central pattern and a plurality of second peripheral patterns, the orthographic projection of the pressing unit on the base substrate coincides with the orthographic projection of the central pattern on the base substrate, and the sum of the areas of the plurality of second peripheral patterns is substantially the same as the gap area between the plurality of pressing units;

[0028] The plurality of second peripheral patterns include tooth-like structures extending from the edge of the central pattern in a direction away from the central pattern and perpendicular to the edge of the central pattern, wherein the tooth-like structures extending from adjacent edges of adjacent electrode patterns are opposite and spaced apart from each other.

[0029] In an optional implementation, the side length of each of the electrode patterns is slightly smaller than the sum of the side length of the pressing unit and the spacing between adjacent pressing units;

[0030] The orthographic projection of each of the pressing platforms on the base substrate partially overlaps with the orthographic projections of four adjacent electrode patterns on the base substrate.

[0031] A second aspect of the embodiments of the present application provides a display device, characterized in that the display device includes a tactile feedback module as described in any one of the first aspect of the embodiments of the present application.

[0032] Beneficial effects:

[0033] The embodiments of the present application provide a tactile feedback module and a display device, wherein the tactile feedback module comprises: a base substrate, and a piezoelectric layer and a touch substrate stacked in sequence on one side of the base substrate, wherein the piezoelectric layer is arranged close to the base substrate; the touch substrate comprises a plurality of pressing units arranged in an array, wherein the pressing unit comprises a pressing platform located at the center of the pressing unit, and a plurality of elastic structures arranged around the pressing platform and connected to the pressing platform, wherein the plurality of elastic structures and the pressing platform are symmetrically arranged about the center of the pressing unit; in a strained state, the elastic structure deforms in a direction close to the piezoelectric layer, and the pressing platform forms a planar contact with the piezoelectric layer, and the strained state is a state in which the touch substrate is subjected to prestress. The present application arranges multiple elastic structures connected to the pressing platform and symmetrical about the center of the pressing platform around the pressing platform. When the pressing platform moves toward the piezoelectric layer under a strain state, the force is uniformly maintained under the action of the multiple elastic structures symmetrically arranged at the center, so that the pressing platform is always in a state parallel to the piezoelectric layer, avoiding tip contact with the piezoelectric layer, increasing the contact area between the pressing unit and the electroactive layer, and thereby improving product safety and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 is a schematic diagram of a hierarchical structure of a tactile feedback module proposed in an embodiment of the present application;

[0036] Figure 2 is a schematic diagram of a top view structure of a touch control substrate proposed in one embodiment of the present application;

[0037] Figure 3 is a schematic diagram of a top view of a pressing unit proposed in an embodiment of the present application;

[0038] Figure 4 is a schematic diagram of a cross-sectional structure of a tactile feedback module in a natural state along line AA' proposed in one embodiment of the present application;

[0039] Figure 5 is a schematic cross-sectional structure diagram of a tactile feedback module in a strained state along line AA' proposed in one embodiment of the present application;

[0040] Figure 6 It is a schematic diagram of a hierarchical structure of an electrode layer of a tactile feedback module provided in an embodiment of the present application;

[0041] Figure 7 is a schematic diagram of a top view structure of an electrode pattern in a tactile feedback module proposed in one embodiment of the present application;

[0042] Figure 8 It is a schematic diagram of the cross-sectional structure along AA' of a tactile feedback module provided with an electrode pattern in a strained state proposed in an embodiment of the present application;

[0043] Fig. 9 is a schematic diagram of a top view structure of an electrode pattern including a central pattern and a first peripheral pattern proposed in an embodiment of the present application;

[0044] Fig.10 is a schematic diagram of an orthographic projection relationship between an electrode pattern including a central pattern and a first peripheral pattern and a touch substrate proposed in one embodiment of the present application;

[0045] Fig.11 is a schematic diagram of a top view structure of an electrode pattern including a central pattern and a second peripheral pattern proposed in one embodiment of the present application;

[0046] Fig.12 is a schematic diagram of an orthographic projection relationship between an electrode pattern including a central pattern and a second peripheral pattern and a touch substrate proposed in one embodiment of the present application;

[0047] Fig.13 is a schematic diagram of a top view structure of another electrode layer proposed in one embodiment of the present application;

[0048] Fig.14 is a schematic diagram of the orthographic projection relationship between an electrode pattern of another electrode layer and a touch substrate proposed in one embodiment of the present application;

[0049] Fig.15 This is a schematic diagram of a square pressing unit in which an end point of an elastic structure close to a pressing platform is connected to a vertex of the pressing platform, as proposed in one embodiment of the present application;

[0050] Fig.16 Schematic diagram of a square pressing unit in which the elastic structure and the pressing platform are connected along the axis of the sub-region according to an embodiment of the present application;

[0051] Fig.17Schematic diagram of a square pressing unit in which the elastic structure and the pressing platform are connected to the vertex of the pressing platform along the direction of the axis of the sub-region proposed in an embodiment of the present application;

[0052] Fig.18 This is a schematic diagram of a circular pressing unit in which an end point of an elastic structure close to the pressing platform is connected to the pressing platform according to an embodiment of the present application;

[0053] Fig.19 It is a schematic diagram of a circular pressing unit proposed in an embodiment of the present application, in which an elastic structure and a pressing platform are connected to the pressing platform along the direction of the central axis of the sub-region.

[0054] Explanation of the accompanying drawings: 1. Base substrate; 2. Piezoelectric layer; 21. Piezoelectric element; 22. Electrode layer; 221. Electrode pattern; 2211. First peripheral pattern; 2212. Second peripheral pattern; 2213. Center pattern; 3. Touch substrate; 31. Pressing unit; 311. Pressing platform; 312. Elastic structure; 3121. U-shaped substructure; 313. Pores; 4. Display substrate. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] In the drawings, the size of the constituent elements, the thickness of the layer or the area may be exaggerated for the sake of clarity. Therefore, any implementation of the present disclosure is not necessarily limited to the size shown in the drawings, and the shapes and sizes of the components in the drawings do not reflect the true proportions. In addition, the drawings schematically show ideal examples, and any implementation of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0057] With the development of technology, touch screens have been used more and more widely and have gradually become one of the most convenient human-computer interaction devices. Therefore, tactile feedback (Haptics) is the focus of current technological development. Specifically, tactile feedback can enable the terminal to interact with the human body through touch. Tactile feedback includes vibration feedback, that is, when the touch substrate triggers the driving signal, the piezoelectric driver generates vibration, thereby driving the substrate to vibrate. This process realizes tactile feedback. As virtual buttons replace physical buttons, tactile feedback has become an important function on display devices.

[0058] However, in the existing solutions, the central pressing plane of the pressing unit is not horizontal during the pressing process, and the contact area with the electroactive layer is small, which will cause "tip contact" during pressing. When a large amount of charge is accumulated, it is easy to cause tip discharge, affecting product safety and quality. Therefore, how to increase the contact area between the pressing unit and the electroactive layer and improve product safety and quality has become an urgent problem to be solved in this field.

[0059] In view of this, the present application embodiment provides a tactile feedback module. Figure 1 FIG. 4 shows a schematic diagram of a hierarchical structure of a tactile feedback module proposed in an embodiment of the present application. Figure 1 As shown, the tactile feedback module includes: a base substrate 1, and a piezoelectric layer 2 and a touch substrate 3 stacked in sequence on one side of the base substrate 1, wherein the piezoelectric layer 2 is arranged close to the base substrate 1. The piezoelectric layer 2 and the base substrate 1 are arranged on the non-contact surface of the touch substrate 3.

[0060] It should be noted that the tactile feedback module provided in the embodiment of the present application can be applied to the fields of medical treatment, automotive electronics, sports tracking systems, etc. It is particularly suitable for the field of wearable devices, medical monitoring and treatment outside the body or implanted inside the human body, or applied to the fields of electronic skin for artificial intelligence. For example, the tactile feedback module described in the embodiment of the present application can apply the piezoelectric layer 2 to brake pads, keyboards, mobile terminals, game controllers, vehicle-mounted devices, etc. that can generate vibration and mechanical properties.

[0061] In some specific embodiments, the tactile feedback module can be combined with a touch screen, and the touch screen can determine the position of human touch, thereby generating corresponding vibration waveforms, amplitudes and frequencies, and realizing human-computer interaction. Exemplarily, the tactile feedback module can be reused as a piezoelectric body, and the position of human touch can be determined by a piezoelectric sensor, thereby generating corresponding vibration waveforms, amplitudes and frequencies, and realizing human-computer interaction; of course, the tactile feedback device can also be applied to medical, automotive electronics, sports tracking systems and other fields according to actual needs, and the embodiments of this application will not be described in detail here.

[0062] In some optional embodiments, such as Figure 1 As shown, the tactile feedback module also includes a display substrate 4, which is arranged on the side of the touch substrate 3 away from the base substrate 1; the touch substrate 3 can be a metal substrate, for example, the touch substrate 3 of the metal material can be used as a touch area structure of a laptop computer to achieve tactile reproduction.

[0063] Optionally, the touch substrate 3 can also be reused as the display substrate. Accordingly, the touch substrate 3 includes a display structure and a touch layer arranged on the side of the base substrate 1 away from the piezoelectric layer 2. The base substrate 1 is arranged on the side of the backlight structure of the display structure away from the display screen, thereby realizing the combination of tactile reproduction technology and display technology.

[0064] In some optional embodiments, the base substrate 1 is arranged on the non-touch surface of the touch substrate 3. Optionally, the base substrate 1 can be a substrate made of glass, a substrate made of silicon dioxide, a substrate made of sapphire, or a substrate made of metal (such as aluminum, stainless steel, etc.). It should be noted that those skilled in the art can arrange the base substrate 1 according to actual application needs, and the embodiments of the present application are not limited here.

[0065] Optionally, the base substrate 1 further includes a grounding layer arranged on a side close to the piezoelectric layer 2, and the grounding layer is a conductive material. For example, the material of the grounding layer may be ITO (indium tin oxide) or a conductive metal such as Cu and Mo.

[0066] In some optional embodiments, the piezoelectric layer 2 is configured to vibrate under the drive of the driving signal triggered by the touch substrate 3, thereby driving the base substrate 1 to vibrate. Optionally, the piezoelectric layer 2 can be a piezoelectric film structure or a piezoelectric ceramic structure, which is conducive to significantly reducing the thickness of the piezoelectric circuit or piezoelectric element, thereby ensuring the lightweight design of the tactile feedback module. Optionally, the material of the piezoelectric layer 2 includes but is not limited to lead zirconate titanate, aluminum nitride, etc.

[0067] In the embodiment of the present application, Figure 2 FIG. 1 shows a schematic diagram of a top view structure of a touch control substrate proposed in an embodiment of the present application. Figure 3 FIG. 1 shows a schematic diagram of a top view of a pressing unit proposed in an embodiment of the present application. Figure 2 and Figure 3 As shown, the touch substrate 3 includes a plurality of pressing units 31 arranged in an array, the pressing unit 31 includes a pressing platform 311 located at the center of the pressing unit 31, and a plurality of elastic structures 312 arranged around the pressing platform 311 and connected to the pressing platform 311, the plurality of elastic structures 312 and the pressing platform 311 are symmetrically arranged about the center of the pressing unit. In the strain state, the elastic structure 312 deforms toward the direction close to the piezoelectric layer 2, the pressing platform 311 forms a planar contact with the piezoelectric layer 2, and the strain state is the state of the touch substrate 3 when it is subjected to prestress.

[0068] It should be noted that the prestress applied to the touch substrate 3 may be a directly applied prestress, for example, applying pressure or tension in the gravity direction of the touch substrate 3, or applying pressure or tension along the length direction of the touch substrate 3, so that the touch substrate 3 undergoes a certain deformation at the microscopic level. The embodiments of the present application do not specifically limit the method and type of applying the prestress, as long as the touch substrate 3 can be placed in the strained state.

[0069] In the embodiment of the present application, a plurality of elastic structures 312 are arranged around the pressing platform 311, which are connected to the pressing platform 311 and are symmetrical about the center of the pressing platform 311. When the pressing platform 311 is subjected to prestress and moves toward the piezoelectric layer 2 under a strain state, the plurality of elastic structures 312 are deformed toward the direction close to the piezoelectric layer 2 under the action of the prestress, so that the pressing platform 311 at the center can maintain uniform force, limit the tendency of the pressing platform 311 to flip and tilt under the action of the prestress, and make the pressing platform 311 always parallel to the piezoelectric layer 2, avoid forming a tip contact with the piezoelectric layer 2, and make the piezoelectric layer 2 form a surface contact with the pressing platform 311, thereby effectively increasing the contact area between the pressing unit 31 and the piezoelectric layer 2, thereby improving product safety and quality.

[0070] Specifically, the touch substrate 3 includes the strain state and the natural state, and the natural state is the state of the touch substrate 3 when no prestress is applied. Figure 4 FIG. 4 shows a schematic cross-sectional structure diagram of a tactile feedback module in a natural state along line AA' proposed in an embodiment of the present application. Figure 4 As shown, in the natural state, there is no contact between the pressing platform 311 and the piezoelectric layer 2 , and the distance between the surface of the pressing platform 311 close to the piezoelectric layer 2 and the piezoelectric layer 2 is less than or equal to the thickness of the touch substrate 3 . Figure 5 FIG. 4 shows a schematic cross-sectional structure diagram of a tactile feedback module in a strained state along line AA' proposed in an embodiment of the present application. Figure 5As shown, in the natural state, the position of the pressing platform 311 is x1; in the strain state, the pressing unit 31 is subjected to prestress, and the elastic structure 312 therein is deformed toward the direction of the piezoelectric layer 2, so that the pressing platform 311 moves toward the direction of the piezoelectric layer 2. Under the restriction of the elastic structure 312 connected to it on all sides and arranged symmetrically with the center, the pressing platform 311 maintains a surface orientation parallel to the piezoelectric layer 2 and moves toward the piezoelectric layer 2 to achieve surface contact with the piezoelectric layer 2. At this time, the position of the pressing platform 311 is x2, and the distance x2-x1 of the pressing platform 311 in the direction perpendicular to the piezoelectric layer in the natural state and the strain state is less than the thickness of the touch substrate 3.

[0071] In some optional embodiments, such as Figure 3 As shown, the pressing unit 31 includes the pressing platform 311 located in the center, and an elastic structure 312 arranged in a "J"-shaped loop. Specifically, each of the elastic structures 312 includes a plurality of U-shaped substructures 3121 extending along a first direction, and adjacent U-shaped substructures 3121 are connected to each other; in the second direction, the lengths of the plurality of U-shaped substructures 3121 along the first direction gradually decrease, the first direction is the extension direction of the edge of the pressing unit 31 close to the elastic structure 312, and the second direction is the direction in which the edge of the pressing unit 31 close to the elastic structure 312 points to the pressing platform 311. In the embodiment of the present application, by setting the elastic structure 312 of the above shape, the elastic structure 312 can be deformed when subjected to the prestress of pressing; and can return to its original state after the pressing is restored.

[0072] Optionally, the material of the pressing unit 31 is a material with strong rigidity and restoring force, including but not limited to stainless steel, metal or alloy. The material of the pressing unit 31 forms a pattern of the pressing platform 311 and the elastic structure 312, and the part of the pressing unit 31 outside the pressing platform 311 and the elastic structure 312 forms a pore 313.

[0073] In some optional embodiments, the U-shaped substructure 3121 includes two strip structures extending along the first direction and parallel to each other, and a connecting structure connecting the ends of the two strip structures, and the width of the strip structure and the connecting structure along the second direction (i.e., the line width of the elastic structure 312) is greater than or equal to 0.1 mm and less than or equal to 2 mm. The area of ​​the pressing platform 311 is greater than or equal to 1 / 4 of the area of ​​the pressing unit 31, and less than or equal to 1 / 2 of the area of ​​the pressing unit 31.

[0074] In some optional embodiments, in order to ensure that the multiple elastic structures 312 in the pressing unit 31 are symmetrically arranged about the center of the pressing unit 31, the pressing unit 31 includes a first dividing line and a second dividing line that are perpendicular to each other, and the first dividing line and the second dividing line intersect to form a plurality of sub-regions, and the plurality of sub-regions are symmetrically arranged about the center of the pressing unit 31, and the plurality of sub-regions have the same area, and the plurality of elastic structures 31 are respectively arranged in the plurality of sub-regions.

[0075] In some optional embodiments, the shape of the pressing platform 311 is the same as that of the pressing unit 31, and in each of the sub-areas, the pressing platform 31 is arranged parallel to the adjacent edges of the pressing unit 31. Figure 3 As shown, the pressing platform 311 and the pressing unit 31 are square, the first dividing line and the second dividing line are respectively the straight lines where the diagonal line of the pressing unit 31 is located, the pressing unit includes 4 sub-areas formed by the intersection of the first dividing line and the second dividing line, and the elastic structure 312 is respectively arranged in each sub-area, so that the elastic structure 312 is symmetrically arranged about the center of the pressing unit 31. The pressing platform 312 is square, and in each sub-area, the edge of the pressing platform 311 and the edge of the pressing unit 31 are parallel to each other.

[0076] In another example, in order to make the stress of the mechanical structure of the pressing unit 31 more balanced and to extend the service life, Fig.18 FIG. 1 shows a schematic diagram of a circular pressing unit in which an end point of an elastic structure close to a pressing platform is connected to the pressing platform in an embodiment of the present application. Fig.18 As shown, the pressing platform 311 and the pressing unit 31 are circular, and the first dividing line and the second dividing line are respectively straight lines where the diameter of the pressing unit 31 is located. The pressing unit includes four sub-areas formed by the intersection of the first dividing line and the second dividing line, and the elastic structure 312 is respectively arranged in each sub-area, so that the elastic structure 312 is symmetrically arranged about the center of the pressing unit 31. The pressing platform 312 is circular, and in each sub-area, the arc edge of the pressing platform 311 and the arc edge of the pressing unit 31 are parallel to each other.

[0077] In the embodiment of the present application, in order to further enhance the limiting performance of the elastic structure 312 on the deflection of the pressing platform 311 and ensure that the pressing platform 311 can maintain a surface orientation parallel to the piezoelectric layer 2 under strain, the connection method between the elastic structure 312 and the pressing platform can be optimized. In some optional embodiments, in order to better make the elastic structure 312 of the pressing unit 31 in each sub-area be evenly stressed, in the same sub-area, the end point of the elastic structure 312 close to the pressing platform 311 is connected to the vertex of the pressing platform 311; or, in the same sub-area, the end point of the elastic structure 312 close to the pressing platform 311 is connected to the midpoint of the edge of the pressing platform 311.

[0078] For example, Fig.15 A schematic diagram of a square pressing unit in which an end point of an elastic structure close to a pressing platform is connected to a vertex of the pressing platform is shown in an embodiment of the present application. Fig.17 FIG. 1 shows a schematic diagram of a square pressing unit in which the elastic structure proposed in an embodiment of the present application and the pressing platform are connected to the vertex of the pressing platform along the direction of the axis in the sub-region, as shown in FIG. Figure 3 , Fig.15 and Fig.17 As shown, the pressing platform 311 and the pressing unit 31 are square, and the end point of the elastic structure 312 close to the pressing platform 311 is connected to the vertex of the pressing platform 311. For another example, Fig.16 FIG. 1 shows a schematic diagram of a square pressing unit in which the elastic structure proposed in an embodiment of the present application is connected to the pressing platform along the axis direction of the sub-region, as shown in FIG. Fig.16 As shown, the pressing platform 311 and the pressing unit 31 are square, and in the same sub-area, the end point of the elastic structure 312 close to the pressing platform 311 is connected to the midpoint of the edge of the pressing platform 311; Fig.19 FIG. 1 shows a schematic diagram of a circular pressing unit in which an elastic structure and a pressing platform are connected to the pressing platform along the axis of the sub-region in an embodiment of the present application. Fig.19 As shown, the pressing platform 311 and the pressing unit 31 are circular, and in the same sub-area, the end point of the elastic structure 312 close to the pressing platform 311 is connected to the midpoint of the edge of the pressing platform 311 .

[0079] In some optional implementations, increasing the total length of the elastic structure 312 can reduce the pressing stroke, allowing the user to press more easily to obtain tactile feedback. Therefore, in the embodiment of the present application, in the same sub-area, the elastic structure and the pressing platform are connected along the direction of the first dividing line or the second dividing line. For example, Fig.15As shown, the pressing platform 311 and the pressing unit 31 are square, and in the same sub-area, the elastic structure 312 is connected to the pressing platform 311 along the direction of the first dividing line or the second dividing line (the straight line where the diagonal line of the pressing unit 31 is located), thereby extending the total length of the elastic structure 312; Fig.18 As shown, the pressing platform 311 and the pressing unit 31 are circular, and in the same sub-area, the elastic structure 312 is connected to the pressing platform 311 along the direction of the first dividing line or the second dividing line (straight lines where mutually perpendicular diameters are located).

[0080] In some optional embodiments, in order to better make the elastic structure 312 of the pressing unit 31 in each sub-region be subjected to uniform force, in the same sub-region, the elastic structure is connected to the pressing platform along the direction of the axis in the sub-region. Fig.16 , Fig.17 As shown, the pressing platform 311 and the pressing unit 31 are square, and in the same sub-area, the elastic structure 312 is connected to the pressing platform 311 along the central axis of the sub-area; Fig.19 As shown, the pressing platform 311 and the pressing unit 31 are square, and in the same sub-region, the elastic structure 312 is connected to the pressing platform 311 along the direction of the central axis of the sub-region.

[0081] In some optional implementations, although the tactile feedback module provided in the embodiment of the present application can avoid the pressing platform 311 from forming a tip contact with the piezoelectric layer, it is limited by the area of ​​the pressing platform 311. Under the strain state, the effective driving area (or contact area) for the pressing platform 311 to form a planar contact with the piezoelectric layer 2 is still small. The small contact area only excites a limited piezoelectric layer, resulting in a weak tactile feedback effect. In order to further improve the tactile feedback effect of the tactile feedback module, Figure 6 FIG. 4 shows a schematic diagram of a hierarchical structure of an electrode layer of a tactile feedback module provided in an embodiment of the present application. Figure 6As shown, in the embodiment of the present application, the piezoelectric layer 2 includes: a piezoelectric element 21; an electrode layer 22, the electrode layer 22 is arranged between the touch substrate 3 and the piezoelectric element 21, the electrode layer 22 includes a plurality of electrode patterns 221 arranged in an array, the orthographic projection of the electrode pattern 221 on the base substrate 1 is located inside the orthographic projection of the piezoelectric element 21 on the base substrate 1; the orthographic projection of the electrode pattern 221 on the base substrate 1 is at least partially overlapped with the orthographic projection of the pressing unit 31 on the base substrate 1, the orthographic projection area of ​​the electrode pattern 221 on the base substrate 1 is greater than or equal to the orthographic projection area of ​​the pressing unit 31 on the base substrate 1, and in the strain state, the pressing platform 311 forms a planar contact with the electrode pattern 221.

[0082] In the embodiment of the present application, by setting an electrode layer 22 located between the piezoelectric element 21 and the touch substrate 3, in the strain state, when the pressing platform 311 is moved toward the piezoelectric layer 2 under the action of prestress, it forms contact with the electrode pattern 221 of the electrode layer 22, and introduces charge into the contacted electrode pattern 221, so that the contact between the pressing platform 311 and the piezoelectric element 21 is replaced by the electrode pattern 221, and the orthographic projection area of ​​the electrode pattern 221 on the base substrate 1 is greater than or equal to the orthographic projection area of ​​the pressing unit 31 on the base substrate 1, so that the driving area of ​​the pressing platform 311 is increased from the area of ​​the pressing platform 311 to the area of ​​the electrode pattern 221, thereby increasing the feedback amplitude of the tactile feedback module and enhancing the tactile feedback intensity.

[0083] Optionally, the material of the electrode layer 22 includes but is not limited to conductive materials such as conductive metals and conductive metal oxides. For example, the material of the electrode layer 22 is Cu, ITO, and the like.

[0084] In some optional embodiments, Figure 7 FIG. 1 shows a schematic diagram of a top view structure of an electrode pattern in a tactile feedback module proposed in an embodiment of the present application. Figure 7 As shown, the orthographic projection of the pressing unit 31 on the base substrate 1 coincides with the orthographic projection of the electrode pattern 221 on the base substrate 1.

[0085] Figure 8 FIG. 1 is a schematic diagram of a cross-sectional structure of a tactile feedback module provided with an electrode pattern in a strain state along line A-A', as shown in FIG. Figure 8As shown, in the natural state, there is no contact between the pressing platform 311 and the electrode pattern 221; in the strain state, the pressing unit 31 is subjected to prestress, and the elastic structure 312 therein is deformed toward the direction of the piezoelectric layer 2, so that the pressing platform 311 moves toward the direction of the piezoelectric layer 2. Under the restriction of the elastic structure 312 connected to it on all sides and arranged symmetrically with the center, the pressing platform 311 maintains a surface orientation parallel to the piezoelectric layer 2 and moves toward the piezoelectric layer 2 to achieve surface contact with the electrode pattern 221. The area of ​​the electrode pattern 221 is the same as that of the pressing unit 31. The electrode pattern 221 contacts the piezoelectric element 21 instead of the pressing platform 311, and drives the area on the piezoelectric element 21 corresponding to the area of ​​the electrode pattern 221 to perform tactile feedback.

[0086] In some optional implementations, in order to further increase the driving area of ​​the pressing unit 31, Fig. 9 FIG. 4 shows a schematic diagram of a top view structure of an electrode pattern including a central pattern and a first peripheral pattern proposed in an embodiment of the present application. Fig.10 FIG. 1 shows a schematic diagram of an orthographic projection relationship between an electrode pattern including a central pattern and a first peripheral pattern and a touch substrate proposed in an embodiment of the present application, such as Fig. 9 and Fig.10 As shown, the electrode pattern 221 includes a central pattern 2213 and a first peripheral pattern 2211 surrounding the central pattern 2213, wherein the orthographic projection of the pressing unit 31 on the base substrate 1 coincides with the orthographic projection of the central pattern 2213 on the base substrate 1, and the width of the first peripheral pattern 2211 is slightly smaller than half of the width of the spacing between two adjacent pressing units 31. In the embodiment of the present application, since there is a spacing between adjacent pressing units 31, the electrode pattern 221 can further cover the gap between adjacent pressing units 31 on the premise of covering the pressing units 31, thereby increasing the driving area of ​​the pressing platform 311. The width of the first peripheral pattern 2211 is slightly smaller than half of the width of the spacing between two adjacent pressing units 31, so as to ensure that adjacent electrode patterns are insulated from each other.

[0087] Exemplarily, the pressing unit 31 is a square, the side length of the pressing unit 31 is d, the spacing between adjacent pressing units 31 is l, the side length of the electrode pattern 221 is close to (d+l), and the orthographic projection of the pressing unit 31 on the base substrate 1 is located at the center of the orthographic projection of the electrode pattern 221 on the base substrate 1, and the driving area S of the pressing unit is close to (d+l). 2 .

[0088] In some optional embodiments, Fig.11FIG. 4 shows a schematic diagram of a top view structure of an electrode pattern including a central pattern and a second peripheral pattern proposed in an embodiment of the present application. Fig.12 FIG. 1 shows a schematic diagram of an orthographic projection relationship between an electrode pattern including a central pattern and a second peripheral pattern and a touch substrate proposed in an embodiment of the present application, such as Fig.11 and Fig.12 As shown, the electrode pattern 221 includes a central pattern 2213 and a plurality of second peripheral patterns 2212, the orthographic projection of the pressing unit 31 on the base substrate 1 coincides with the orthographic projection of the central pattern 2213 on the base substrate 1, and the sum of the areas of the plurality of second peripheral patterns 2212 is substantially the same as the gap area between the plurality of pressing units 31; the plurality of second peripheral patterns 2212 include a tooth-like structure extending from the edge of the central pattern 2213 in a direction away from the central pattern 2213 and perpendicular to the edge of the central pattern 2213, wherein the tooth-like structures extending from adjacent edges of adjacent electrode patterns 221 are opposite and spaced apart from each other.

[0089] In the embodiment of the present application, since the driving area is equivalent to the minimum rectangular area containing the electrode pattern 221, the shape of the electrode pattern 221 can be changed without increasing the area of ​​the electrode pattern 221, thereby increasing the driving area, so that the pressing unit 31 can drive a larger area of ​​the piezoelectric layer 2 to produce a tactile feedback effect under the strain state. Specifically, a plurality of the second electrode patterns 2212 are provided, and a plurality of second electrode patterns 2212 extending from the relative edges of two adjacent electrode patterns 221 form the tooth-like structure, which meshes in a concave-convex complementary form, and the adjacent second electrode patterns 2212 are insulated from each other, thereby effectively increasing the driving area. When the piezoelectric layer drives the substrate 1 to bend under the drive of the electrode pattern 221 of the driving area, the bending moment will increase, thereby increasing the displacement of the tactile feedback.

[0090] Exemplarily, the pressing unit 31 is a square, the second electrode pattern 2212 is a rectangle, the side length of the pressing unit 31 is d, n second electrode patterns 2212 are arranged on each side of the same electrode pattern 221, the spacing between adjacent second electrode patterns 2212 is a, and the width of each second electrode pattern is b. Then, the side length d of the pressing unit 31 satisfies (n-1)a+nb, thereby ensuring that the sum of the areas of the multiple second peripheral patterns 2212 is approximately the same as the gap area between the multiple pressing units 31.

[0091] In some optional implementations, in order to further increase the effective driving area of ​​each pressing unit 31, each pressing platform 311 is configured to drive a plurality of electrode patterns 22. Specifically, Fig.13FIG. 2 shows a schematic diagram of a top view structure of another electrode layer proposed in an embodiment of the present application. Fig.14 FIG. 1 shows a schematic diagram of the orthographic projection relationship between an electrode pattern of another electrode layer and a touch substrate proposed in an embodiment of the present application. Fig.13 and Fig.14 As shown, the multiple electrode patterns 22 are arranged in an array, and the side length of each of the electrode patterns 22 is slightly smaller than the sum of the side length of the pressing unit 31 and the spacing between adjacent pressing units 31; the orthographic projection of each of the pressing platforms 311 on the base substrate 1 partially overlaps with the orthographic projections of four adjacent electrode patterns 22 on the base substrate 1.

[0092] In the embodiment of the present application, the orthographic projection of each of the pressing platforms 311 on the base substrate 1 partially overlaps with the orthographic projections of four adjacent electrode patterns 22 on the base substrate 1. In the strain state, the pressing platform 311 contacts the four adjacent electrode patterns 22, and the four adjacent electrode patterns 22 receive electric charges, driving the areas of the piezoelectric elements 21 corresponding to the four adjacent electrode patterns 22 to perform tactile feedback.

[0093] Optionally, the shape of the electrode pattern 22 is the same as that of the pressing unit, the center of the region where the four adjacent electrode patterns 22 are located coincides with the center of the pressing unit 31, and the adjacent electrode patterns 22 are insulated from each other. In the strained state, the pressing platform 311 forms a planar contact with the adjacent vertex regions of the four adjacent electrode patterns 22, so that the pressing platform 311 drives the piezoelectric element 21 through the four adjacent electrode patterns 22 to perform tactile feedback in the region corresponding to the four adjacent electrode patterns 22.

[0094] Exemplarily, the pressing unit 31 is a square, the side length of the pressing unit 31 is d, the spacing between adjacent pressing units 31 is l, the side length of the electrode pattern 221 is close to (d+l), and the driving area S of the pressing unit is close to 4(d+l). 2 .

[0095] The embodiments of the present application provide a tactile feedback module and a display device, wherein the tactile feedback module comprises: a base substrate, and a piezoelectric layer and a touch substrate stacked in sequence on one side of the base substrate, wherein the piezoelectric layer is arranged close to the base substrate; the touch substrate comprises a plurality of pressing units arranged in an array, wherein the pressing unit comprises a pressing platform located at the center of the pressing unit, and a plurality of elastic structures arranged around the pressing platform and connected to the pressing platform, wherein the plurality of elastic structures and the pressing platform are symmetrically arranged about the center of the pressing unit; in a strained state, the elastic structure deforms in a direction close to the piezoelectric layer, and the pressing platform forms a planar contact with the piezoelectric layer, and the strained state is a state in which the touch substrate is subjected to prestress. The present application arranges multiple elastic structures connected to the pressing platform and symmetrical about the center of the pressing platform around the pressing platform. When the pressing platform moves toward the piezoelectric layer under a strain state, the force is uniformly maintained under the action of the multiple elastic structures symmetrically arranged at the center, so that the pressing platform is always in a state parallel to the piezoelectric layer, avoiding tip contact with the piezoelectric layer, increasing the contact area between the pressing unit and the electroactive layer, and thereby improving product safety and quality.

[0096] Based on the same inventive concept, an embodiment of the present application discloses a display device, which includes a tactile feedback module as described in the embodiment of the present application.

[0097] In some optional implementations, the display device is a product with an image display function. Optionally, the display device can be used to display static images, such as pictures, photos, etc.; the display device can also be used to display dynamic images, such as videos, game screens, etc.

[0098] In some optional embodiments, the display device includes but is not limited to a laptop computer, a mobile phone, a wireless device, a personal data assistant (PDA), a handheld or portable computer, a GPS receiver / navigator, a camera, an MP4 video player, a camcorder, a game console, a watch, a clock, a calculator, a television monitor, a flat panel display, a computer monitor, a car display, a navigator, a cockpit controller and / or display, a display of a camera view, an electronic photograph, an electronic billboard or sign, a projector, packaging and aesthetic structures, etc.

[0099] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0100] In the description of this specification, it should be understood that the terms "center", "thickness", "up", "down", "front", "back", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0101] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0102] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0103] The above application provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0104] The term "one embodiment", "embodiment" or "one or more embodiments" herein means that a particular feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. In addition, please note that the examples of the term "in one embodiment" here do not necessarily all refer to the same embodiment.

[0105] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0106] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0107] The tactile feedback module and display device provided by the present application are introduced in detail above. The principles and implementation methods of the present application are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A tactile feedback module, characterized in that: The tactile feedback module comprises: A base substrate, and a piezoelectric layer and a touch substrate stacked in sequence on one side of the base substrate, wherein the piezoelectric layer is arranged close to the base substrate; The touch substrate includes a plurality of pressing units arranged in an array, the pressing unit includes a pressing platform located at the center of the pressing unit, and a plurality of elastic structures arranged around the pressing platform and connected to the pressing platform, the plurality of elastic structures and the pressing platform are symmetrically arranged about the center of the pressing unit; In the strain state, the elastic structure is deformed in a direction close to the piezoelectric layer, and the pressing platform forms a planar contact with the piezoelectric layer. The strain state is a state in which the touch substrate is subjected to prestress.

2. The tactile feedback module according to claim 1, characterized in that: Each of the elastic structures comprises a plurality of U-shaped substructures extending along a first direction, and adjacent U-shaped substructures are connected to each other; In the second direction, the lengths of the multiple U-shaped substructures along the first direction gradually decrease. The first direction is the extension direction of the edge of the pressing unit close to the elastic structure, and the second direction is the direction of the edge of the pressing unit close to the elastic structure pointing to the pressing platform.

3. The tactile feedback module according to claim 1, characterized in that: In a natural state, there is no contact between the pressing platform and the piezoelectric layer, and a distance between a surface of the pressing platform close to the piezoelectric layer and the piezoelectric layer is less than or equal to the thickness of the touch substrate. The natural state is a state in which the touch substrate is not subjected to prestress.

4. The tactile feedback module according to claim 1, characterized in that: The pressing unit includes a first dividing line and a second dividing line that are perpendicular to each other. The first dividing line and the second dividing line intersect to form a plurality of sub-areas. The plurality of elastic structures are respectively arranged in the plurality of sub-areas.

5. The tactile feedback module according to claim 4, characterized in that: In the same sub-region, the end point of the elastic structure close to the pressing platform is connected to the vertex of the pressing platform, or, In the same sub-region, an end point of the elastic structure close to the pressing platform is connected to a midpoint of an edge of the pressing platform.

6. The tactile feedback module according to claim 4, characterized in that: In the same sub-area, the elastic structure is connected to the pressing platform along the direction of the first dividing line or the second dividing line, or, In the same sub-region, the elastic structure is connected to the pressing platform along the direction of the central axis of the sub-region.

7. The tactile feedback module according to claim 4, characterized in that: The shape of the pressing platform is the same as that of the pressing unit. In each of the sub-areas, the pressing platform is arranged parallel to adjacent edges of the pressing unit.

8. The tactile feedback module according to claim 7, characterized in that: The pressing platform and the pressing unit are square, and the first dividing line and the second dividing line are respectively straight lines where the diagonal lines of the pressing unit are located.

9. The tactile feedback module according to claim 7, characterized in that: The pressing platform and the pressing unit are circular, and the first dividing line and the second dividing line are respectively straight lines where the diameter of the pressing unit is located.

10. The tactile feedback module according to any one of claims 1 to 9, characterized in that: The piezoelectric layer comprises: Piezoelectric elements; An electrode layer, the electrode layer is disposed between the touch substrate and the piezoelectric element, the electrode layer includes a plurality of electrode patterns arranged in an array, and the orthographic projection of the electrode pattern on the base substrate is located inside the orthographic projection of the piezoelectric element on the base substrate; The orthographic projection of the electrode pattern on the base substrate at least partially overlaps with the orthographic projection of the pressing unit on the base substrate, the orthographic projection area of ​​the electrode pattern on the base substrate is greater than or equal to the orthographic projection area of ​​the pressing unit on the base substrate, and in the strain state, the pressing platform forms a planar contact with the electrode pattern.

11. The tactile feedback module according to claim 10, characterized in that: The orthographic projection of the pressing unit on the base substrate coincides with the orthographic projection of the electrode pattern on the base substrate.

12. The tactile feedback module according to claim 10, characterized in that: The electrode pattern includes a central pattern and a first peripheral pattern surrounding the central pattern; The orthographic projection of the pressing unit on the base substrate coincides with the orthographic projection of the central pattern on the base substrate, and the width of the first peripheral pattern is slightly smaller than half of the width of the interval between two adjacent pressing units.

13. The tactile feedback module according to claim 10, characterized in that: The electrode pattern includes a central pattern and a plurality of second peripheral patterns, the orthographic projection of the pressing unit on the base substrate coincides with the orthographic projection of the central pattern on the base substrate, and the sum of the areas of the plurality of second peripheral patterns is substantially the same as the gap area between the plurality of pressing units; The plurality of second peripheral patterns include tooth-like structures extending from the edge of the central pattern in a direction away from the central pattern and perpendicular to the edge of the central pattern, wherein the tooth-like structures extending from adjacent edges of adjacent electrode patterns are opposite and spaced apart from each other.

14. The tactile feedback module according to claim 10, characterized in that: The side length of each of the electrode patterns is slightly smaller than the sum of the side length of the pressing unit and the spacing between adjacent pressing units; The orthographic projection of each of the pressing platforms on the base substrate partially overlaps with the orthographic projections of four adjacent electrode patterns on the base substrate.

15. A display device, characterized in that: The display device comprises a tactile feedback module as described in any one of claims 1-14.

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