A haptic feedback panel and display device
By using piezoelectric thin films or piezoelectric ceramic blocks to excite the cover plate to resonate on the vehicle display screen, combined with the support layer opening design, the problem of traditional linear motors being unable to achieve tactile feedback for large-size screen modules is solved, achieving a strong vibration and low-cost tactile feedback effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2023-07-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies struggle to effectively excite large-size screen modules to generate vibrations and achieve haptic feedback using traditional linear motors, especially in automotive displays.
Using piezoelectric thin films or piezoelectric ceramic blocks as piezoelectric devices, resonance is generated by exciting the cover plate. Combined with the opening design of the support layer, the resonance frequency and vibration mode of the cover plate are adjusted to achieve a strong tactile feedback effect.
It achieves strong vibration and haptic feedback for large-size screen modules, reduces cost and power consumption, and improves the effect of haptic feedback.
Smart Images
Figure CN119731620B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of haptic feedback technology, and in particular to a haptic feedback panel and display device. Background Technology
[0002] Haptics is a key area of technological development today. Specifically, haptic feedback enables interaction between a device and the human body through touch. Summary of the Invention
[0003] This disclosure provides a haptic feedback panel and display device, the specific solution of which is as follows:
[0004] This disclosure provides a haptic feedback panel, comprising:
[0005] Display module;
[0006] A cover plate is disposed on the light-emitting side of the display module, and the size of the cover plate is larger than the size of the display module;
[0007] Multiple piezoelectric devices are disposed on the same side of the cover plate as the display module, and the multiple piezoelectric devices are disposed on at least one opposite side of the display module;
[0008] A support layer is disposed on the same side of the cover plate as the piezoelectric device and at least on one side of the display module. The orthographic projection of the support layer on the cover plate does not overlap with the orthographic projection of the piezoelectric device on the cover plate. At least a portion of the support layer has multiple openings that disconnect the support layer.
[0009] The back frame has a receiving space for supporting the display module, and the back frame is fixedly connected to the support layer.
[0010] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the support layer is disposed around the display module, and the support layer has at least the region adjacent to the piezoelectric device having the plurality of openings.
[0011] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the cover plate has a pair of long sides disposed opposite to each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is disposed on one side of the pair of long sides near the cover plate.
[0012] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the cover plate has a pair of long sides disposed opposite to each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is disposed on one side of the pair of short sides near the cover plate.
[0013] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the piezoelectric device is disposed around the cover plate.
[0014] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the opening is provided in a one-to-one correspondence with the piezoelectric device, the length of the opening along the arrangement direction of the piezoelectric device is greater than or equal to the length of the piezoelectric device along the arrangement direction of the piezoelectric device, and the piezoelectric device is disposed in at least a portion of the space of the opening.
[0015] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the center of the piezoelectric device and the center of the opening coincide.
[0016] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the orthographic projection of the piezoelectric device on the cover plate and the orthographic projection of the opening on the cover plate have an overlapping area, and the center of the piezoelectric device and the center of the opening do not coincide.
[0017] In a possible implementation, the haptic feedback panel provided in the embodiments of this disclosure further includes a protective layer disposed on the side of each piezoelectric device facing away from the cover plate. The protective layer covers the surface of the piezoelectric device facing away from the cover plate and covers the side of the piezoelectric device that is not in contact with the support layer, and the protective layer is disposed in contact with the cover plate.
[0018] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the thickness of the support layer is greater than the maximum thickness of the protective layer.
[0019] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, each side of the support layer has a plurality of openings that disconnect the support layer, and the piezoelectric device is disposed between the support layer and the display module.
[0020] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the number of openings on each side of the support layer is less than the number of piezoelectric devices.
[0021] In a possible implementation, the haptic feedback panel provided in the embodiments of this disclosure further includes a protective layer disposed on the side of the piezoelectric device away from the cover plate. The protective layer covers the surface of the piezoelectric device away from the cover plate and the side of the piezoelectric device, and the protective layer is a closed ring surrounding the display module.
[0022] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the material of the protective layer includes green oil or conformal coating.
[0023] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the piezoelectric device is disposed at the position of the crest and / or trough of the mechanical wave that drives the cover plate to vibrate.
[0024] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the material of the support layer includes at least one of rubber, foam, cotton foam, and polydimethylsiloxane.
[0025] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the display module includes a display panel and a backlight stacked on the side of the cover plate facing the back frame.
[0026] In a possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the piezoelectric device includes a first electrode, a piezoelectric layer and a second electrode stacked together. The first electrode of each piezoelectric device is grounded. The second electrodes of each piezoelectric device located on the same side of the display module are electrically connected to the same driving voltage terminal. The second electrodes of the piezoelectric devices located on different sides of the display module are electrically connected to different driving voltage terminals.
[0027] In a possible implementation, the haptic feedback panel provided in the embodiments of this disclosure further includes: a flexible circuit board disposed within the back frame and electrically connected to the display module, and a printed circuit board disposed outside the back frame; the first electrode and the second electrode of the piezoelectric device are respectively electrically connected to the flexible circuit board, and the flexible circuit board is electrically connected to the printed circuit board through the opening.
[0028] In a possible implementation, in the tactile feedback panel provided in the embodiments of this disclosure, the structure of the piezoelectric device is a piezoelectric thin film or a piezoelectric ceramic block.
[0029] In possible implementations, in the haptic feedback panel provided in the embodiments of this disclosure, the cover plate includes a cover plate for the surface of a laptop display module, a cover plate for the surface of a vehicle display module, or a cover plate for the surface of a mobile terminal display module.
[0030] Accordingly, this disclosure also provides a display device including a haptic feedback panel as described in any of the above embodiments of this disclosure. Attached Figure Description
[0031] Figure 1 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0032] Figure 2 for Figure 1 A schematic diagram of the cross-section along the CC' direction;
[0033] Figure 3 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0034] Figure 4 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0035] Figure 5 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0036] Figure 6 for Figure 5 A schematic diagram of the cross-section along the CC' direction;
[0037] Figure 7 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0038] Figure 8 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0039] Figure 9 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0040] Figure 10 for Figure 9 A schematic diagram of the cross-section along the CC' direction;
[0041] Figure 11 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0042] Figure 12 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0043] Figure 13 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0044] Figure 14 for Figure 13 A schematic diagram of the cross-section along the CC' direction;
[0045] Figure 15 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0046] Figure 16 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;
[0047] Figure 17 The vibration waveform corresponding to the piezoelectric device being placed on one of the two short sides of the cover plate;
[0048] Figure 18 The vibration waveform corresponding to the piezoelectric device being placed on one of the two long sides of the cover plate. Detailed Implementation
[0049] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0050] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms as used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.
[0051] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
[0052] For vibration-based tactile reproduction devices, the working principle typically involves attaching a piezoelectric sheet, linear motor, or piezoelectric film to a substrate and applying pulse excitation to achieve touch functions such as virtual buttons. Among these solutions, the use of linear motors is problematic because their relatively small mass makes it difficult to drive large screen modules (such as automotive displays) to vibrate and provide tactile feedback.
[0053] This disclosure provides a haptic feedback panel, such as... Figures 1-16 As shown, Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 , Figure 12 , Figure 13 , Figure 15 and Figure 16 These are schematic diagrams of the planar structure of the haptic feedback panel. Figure 2 for Figure 1 A schematic diagram of the cross-section along the CC' direction. Figure 6 for Figure 5 A schematic diagram of the cross-section along the CC' direction. Figure 10 for Figure 9 A schematic diagram of the cross-section along the CC' direction. Figure 14 for Figure 13 A cross-sectional view along the CC' direction shows that the haptic feedback panel includes:
[0054] Display module 1;
[0055] Cover plate 2 is disposed on the light-emitting side of display module 1, and the size of cover plate 2 is larger than the size of display module 1;
[0056] Multiple piezoelectric devices 3 are disposed on the same side of the cover plate 2 as the display module 1, and the multiple piezoelectric devices 3 are disposed on at least one opposite side of the display module 1;
[0057] The support layer 4 is disposed on the same side of the cover plate 2 as the piezoelectric device 3 and at least on one side of the display module 1. The orthographic projection of the support layer 4 on the cover plate 2 does not overlap with the orthographic projection of the piezoelectric device 3 on the cover plate 2. At least part of the support layer 4 has multiple openings 41 that disconnect the support layer 4.
[0058] The back frame 5 has a receiving space for supporting the display module 1, and the back frame 5 is fixedly connected to the support layer 4.
[0059] The tactile feedback panel provided in this embodiment can achieve a strong tactile feedback effect by exciting the cover plate to resonate at a specific frequency using piezoelectric devices. For example, the high-frequency vibrating cover plate creates a pressure film effect with the finger surface, which can change the coefficient of friction between the finger and the plate, thereby achieving a change in texture tactile sensation; the low-frequency vibrating cover plate interacts with the finger to achieve vibration tactile feedback. Furthermore, by configuring the support layer to include an opening, the resonant frequency and vibration mode of the cover plate can be changed by adjusting the connection strength between the support layer and the cover plate, thereby achieving strong vibration of the cover plate.
[0060] In practical implementation, for vehicle-mounted display modules, due to their large mass, it is difficult to generate textured tactile feedback through traditional linear motor excitation. Therefore, in the tactile feedback panel provided in the embodiments of this disclosure, such as... Figures 1-16As shown, the structure of the piezoelectric device 3 can be a piezoelectric thin film or a piezoelectric ceramic block. Using a piezoelectric thin film or a piezoelectric ceramic block, a given voltage to the piezoelectric device 3 can directly provide vibration excitation. By utilizing the resonant frequency of some components of the screen module, the structure can generate ultrasonic vibration, which enables the tactile feedback panel to produce a tactile feedback effect, and further adjusts the tactile feedback through the film effect.
[0061] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-16 As shown, the cover plate 2 is a structure that comes into direct contact with tactile senses such as fingers. It can be a cover plate for the surface of a laptop display module, a cover plate for the surface of a vehicle display module, a cover plate for the surface of a mobile terminal display module, or a cover plate for the surface of a display module in other application scenarios.
[0062] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 , Figure 12 , Figure 13 , Figure 15 and Figure 16 As shown, the support layer 4 can be arranged around the display module 1, and the support layer 4 has multiple openings 41 in the area adjacent to the piezoelectric device 3. In this way, on the one hand, the large area of the support layer 4 can freely adjust the connection strength between the support layer 4 and the cover plate 2 to change the resonant frequency and vibration mode of the cover plate 2, so as to realize strong vibration of the cover plate 2; on the other hand, the support layer 4 has multiple openings 41 in the area adjacent to the piezoelectric device 3, which is conducive to the first electrode and the second electrode of the piezoelectric device 3 being led out through the openings 41 to the printed circuit board on the outside of the back frame 5 (described later) through the flexible circuit board, so as to realize the transmission of electrical signals.
[0063] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 3 , Figure 7 , Figure 11 and Figure 15 As shown, the cover plate 2 has a pair of long sides 21 arranged opposite each other and a pair of short sides 22 connected to the pair of long sides 21. For a haptic feedback panel that only needs to excite the long sides 21 of the cover plate 2 to vibrate, the piezoelectric device 3 can be provided only on one side close to the pair of long sides 21 of the cover plate 2. This can save the number of piezoelectric devices 3, reduce costs, and reduce power consumption.
[0064] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 4 , Figure 5 , Figure 8 , Figure 12 and Figure 16 As shown, the cover plate 2 has a pair of long sides 21 arranged opposite each other and a pair of short sides 22 connected to the pair of long sides 21. For a haptic feedback panel that only needs to excite the short sides 22 of the cover plate 2 to vibrate, the piezoelectric device 3 can be provided only on the side close to the pair of short sides 22 of the cover plate 2. This can save the number of piezoelectric devices 3, reduce costs, and reduce power consumption.
[0065] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 , Figure 3 , Figure 5 , Figure 9 and Figure 13 As shown, for a tactile feedback panel that requires vibration to be generated around the cover plate 2, the piezoelectric device 3 can be disposed around the cover plate 2.
[0066] Optionally, this disclosure can adjust the arrangement of piezoelectric devices on the cover plate to generate high-frequency resonance, thereby achieving tactile feedback adjustment through the pressure film effect.
[0067] In practical implementation, to improve the haptic feedback effect, the haptic feedback panel provided in the embodiments of this disclosure, such as... Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 , Figure 12 , Figure 13 , Figure 15 and Figure 16 As shown, the piezoelectric device 3 can be positioned at the crest and / or trough of the mechanical wave that drives the cover plate 2 to vibrate. Compared with piezoelectric devices not positioned at the crest and trough, the piezoelectric device 3 positioned at the crest and trough has higher excitation efficiency. For example, under the same driving voltage, the vibration displacement of the piezoelectric device 3 at the crest and trough is larger, thereby improving the tactile feedback effect.
[0068] Optionally, in the embodiments of this disclosure, all the piezoelectric devices can be located at the crest of the cover plate vibration, all of them can be located at the trough of the cover plate vibration, or a portion can be located at the crest of the cover plate vibration and another portion can be located at the trough of the cover plate vibration.
[0069] Specifically, when piezoelectric devices are installed at both the crest and trough positions, to achieve the tactile feedback function, the frequency of the AC voltage signal applied by the piezoelectric device at the crest position must be the same as the frequency of the AC voltage signal applied by the piezoelectric device at the trough position. However, the phase of the AC voltage signal applied by the piezoelectric device at the crest position must be 180° different from the phase of the AC voltage signal applied by the piezoelectric device at the trough position in order to achieve the vibration effect of the cover plate along the crest and trough.
[0070] In practical applications, the natural frequency and mode shape to be changed can be determined first by simulation based on the parameters of the cover plate itself, such as mass, shape, and material (when there are multiple natural frequencies and mode shapes, the natural frequency and mode shape with the larger amplitude are selected). The positions of the peaks and troughs of the vibration to be changed can be determined. Then, the piezoelectric device can be placed at the peak and / or trough. Of course, the piezoelectric device can be placed near the peak or trough according to actual needs to be compatible with the various natural modes of the cover plate. The specific position of the piezoelectric device on the cover plate can be adjusted with the maximum amplitude as the target. This disclosure does not limit this.
[0071] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12 As shown, openings 41 are correspondingly arranged one-to-one with piezoelectric devices 3. The length of opening 41 along the arrangement direction of piezoelectric devices 3 is greater than or equal to the length of piezoelectric devices 3 along the arrangement direction of piezoelectric devices 3. Piezoelectric devices 3 are disposed within at least a portion of the space of opening 41. By disposing of piezoelectric devices 3 within at least a portion of the space of opening 41 in support layer 4, the space occupied by piezoelectric devices 3 and support layer 4 on the periphery of display module 1 can be reduced, the width of cover plate 2 on the periphery of display module 1 can be reduced, thereby reducing the bezel of haptic feedback panel.
[0072] It should be noted that, as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12 As shown, this embodiment of the present disclosure is illustrated by taking the example that the length of the opening 41 along the arrangement direction of the piezoelectric device 3 is equal to the length of the piezoelectric device 3 along the arrangement direction of the piezoelectric device 3. Of course, it is also possible that the length of the opening 41 along the arrangement direction of the piezoelectric device 3 is equal to the length of the piezoelectric device 3 along the arrangement direction of the piezoelectric device 3.
[0073] In practical implementation, to ensure the haptic feedback panel has the lowest possible bezel and that the piezoelectric device is positioned precisely at the crest or trough of the cover plate's vibration, parameters of the cover plate itself, such as its mass, shape, and material, can be adjusted so that the crest or trough is located precisely at the center of the opening. Therefore, in the haptic feedback panel provided in this embodiment, as... Figure 1 , Figure 3 and Figure 4 As shown, the center of the piezoelectric device 3 can coincide with the center of the opening 41, which can minimize the space occupied by the piezoelectric device 3 and the support layer 4 on the outer cover plate 2 of the display module 1, and can also allow the piezoelectric device 3 to be placed at the peak and / or trough position, improving the excitation efficiency and thus improving the tactile feedback effect.
[0074] In practical implementation, to minimize the bezel of the haptic feedback panel, even adjusting parameters such as mass, shape, and material of the cover plate itself may not ensure that the peak or trough of the cover plate vibration is precisely located at the center of the opening. For example, the peak or trough position may deviate from the center of the opening. For instance, in the haptic feedback panel provided in the embodiments of this disclosure, such as... Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12 As shown, the orthographic projection of the piezoelectric device 3 on the cover plate 2 and the orthographic projection of the opening 41 on the cover plate 2 have an overlapping area, and the center of the piezoelectric device 3 and the center of the opening 41 do not coincide. This reduces the space occupied by the piezoelectric device 3 and the support layer 4 on the outer cover plate 2 of the display module 1, and also allows the piezoelectric device 3 to be positioned at the crest and / or trough of the wave, improving excitation efficiency and thus enhancing the tactile feedback effect.
[0075] Optionally, such as Figure 5 , Figure 7 and Figure 8 As shown, the crest or trough of the vibration of the cover plate 2 can be located between the center of the opening 41 and the outer edge of the cover plate 2, so that the piezoelectric device 3 is positioned between the center of the opening 41 and the outer edge of the cover plate 2; Figure 9 , Figure 11 and Figure 12 As shown, the peak or trough of the vibration of the cover plate 2 is located between the center of the opening 41 and the display module 1, so that the piezoelectric device 3 is positioned between the center of the opening 41 and the display module 1.
[0076] Optionally, such as Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12 As shown, the distance between the center of the piezoelectric device 3 and the center of the opening 41 is determined based on the actual position of the peaks and troughs of the vibration of the cover plate 2.
[0077] like Figure 17 As shown, Figure 17 This describes the vibration waveform when the piezoelectric device is positioned on one of the short sides near the cover plate. The center of the piezoelectric device on the short side should be aligned with... Figure 17 The peak or trough position corresponds to; such as Figure 18 As shown, Figure 18 The vibration waveform corresponding to the piezoelectric device being positioned on one of the pair of long sides near the cover plate is such that the center of the piezoelectric device located on the long side should be aligned with... Figure 18 The peaks or troughs correspond to the positions of the waves.
[0078] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-12 As shown, it also includes a protective layer 6 disposed on the side of each piezoelectric device 3 facing away from the cover plate 2. Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12 The protective layer 6 is not shown. The protective layer 6 covers the surface of the piezoelectric device 3 away from the cover plate 2 and the side of the piezoelectric device 3 that is not in contact with the support layer 4. The protective layer 6 is positioned in contact with the cover plate 2. In this way, the protective layer 6 can seal the piezoelectric device 3 between the protective layer 6 and the cover plate 2, which can isolate the piezoelectric device 3 from contact with the outside air and improve the high humidity resistance of the haptic feedback panel.
[0079] In practical implementation, since the support layer mainly serves to connect the cover plate and the back frame, in the tactile feedback panel provided in the embodiments of this disclosure, as follows: Figure 2 , Figure 6 and Figure 10 As shown, the thickness of the support layer 4 is greater than the maximum thickness of the protective layer 6, so that the back frame 5 can be in close contact with the support layer 4.
[0080] Optionally, in the haptic feedback panel provided in the embodiments of this disclosure, the material of the support layer may include, but is not limited to, rubber, foam, cotton foam, polydimethylsiloxane (PDMS) at least one of these materials, which can securely connect the cover plate and the back frame.
[0081] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 13-16As shown, each side of the support layer 4 has multiple openings 41 that disconnect the support layer 4. The peaks or troughs of the vibration of the cover plate 2 may be located between the support layer 4 and the display module 1. Therefore, the piezoelectric device 3 is placed between the support layer 4 and the display module 1, so that the piezoelectric device 3 is positioned at the peaks or troughs of the vibration of the cover plate 2. In addition, by placing the piezoelectric device 3 between the support layer 4 and the display module 1, the piezoelectric device 3 is located within the sealed space formed by the back frame 5 and the support layer 4, which can further isolate the piezoelectric device 3 from the outside air and further improve the high humidity resistance of the haptic feedback panel.
[0082] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 13 , Figure 15 and Figure 16 As shown, the number of openings 41 on each side of the support layer 4 can be less than the number of piezoelectric devices 3, but it is not limited to this.
[0083] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 13-16 As shown, it also includes a protective layer 6 disposed on the side of the piezoelectric device 3 facing away from the cover plate 2. Figure 13 , Figure 15 and Figure 16 The protective layer 6 is not shown. The protective layer 6 covers the surface of the piezoelectric device 3 away from the cover plate 2 and the side of the piezoelectric device 3. The protective layer 6 is a closed ring surrounding the display module 1. In this way, the protective layer 6 can seal the piezoelectric device 3 between the protective layer 6 and the cover plate 2, which can isolate the piezoelectric device 3 from contact with the outside air, improve the high humidity resistance of the haptic feedback panel, and the closed ring structure of the protective layer 6 can reduce the manufacturing process of the protective layer 6.
[0084] Alternatively, the material of the protective layer may include, but is not limited to, green oil or conformal coating.
[0085] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-16 As shown, the display module 1 may include a display panel and a backlight stacked on the side of the cover plate 2 facing the back frame 5. The display panel is an automotive LCD display panel. This disclosure uses a piezoelectric thin film or a piezoelectric ceramic block. Given a voltage to the piezoelectric device 3, vibration excitation can be directly provided. By utilizing the resonant frequency of some components of the screen module, the structure can generate ultrasonic vibration, so that the tactile feedback panel generates a tactile feedback effect, and further adjusts the tactile feedback through the pressure film effect.
[0086] It should be noted that the display panel and backlight in the display module provided in this embodiment have the same structure as those in the prior art, and will not be described in detail here.
[0087] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-16 As shown, the piezoelectric device 3 may include a first electrode, a piezoelectric layer, and a second electrode stacked together. The first electrode of each piezoelectric device 3 is grounded. The second electrodes of each piezoelectric device 3 located on the same side of the display module 1 can be electrically connected to the same driving voltage terminal, and the second electrodes of piezoelectric devices 3 located on different sides of the display module 1 can be electrically connected to different driving voltage terminals. This allows all piezoelectric devices 3 on the same side of the display module 1 to be driven as a whole, which can reduce power consumption.
[0088] Alternatively, in the embodiments of this disclosure, each piezoelectric device can be driven independently, or all piezoelectric devices on the cover plate can be driven as a whole, depending on actual needs.
[0089] In practical implementation, for example, a ground voltage signal can be applied to the first electrode and an AC voltage signal can be applied to the second electrode. This creates an alternating electric field between the first and second electrodes, with the frequency of the alternating electric field being the same as the frequency of the AC voltage signal. Under the action of the alternating electric field, the piezoelectric layer deforms and generates a vibration signal. The frequency of this vibration signal is the same as the frequency of the alternating electric field. When the frequency of the vibration signal approaches or equals the natural frequency of the cover plate, resonance occurs, the amplitude increases, and a tactile feedback signal is generated. When a finger touches the modified surface, a noticeable change in friction can be felt. In practical applications, the surface friction can be adjusted by the resonance generated between the piezoelectric layer and the modified surface, thereby reproducing the texture of an object on the modified surface.
[0090] In specific implementation, in the tactile feedback panel provided in the embodiments of this disclosure, the material of the first electrode can be a transparent material. For example, the material of the first electrode may include at least one of ITO, IZO, IGZO, and AZO.
[0091] In practice, the material of the second electrode is generally ITO, but it is not limited to this.
[0092] Of course, in specific implementation, if the transmittance of the device is not considered, the first electrode and the second electrode can also be made of one of titanium-gold (Ti-Au) alloy, titanium-aluminum-titanium (Ti-Al-Ti) alloy, and titanium-molybdenum (Ti-Mo) alloy. In addition, they can also be made of one of titanium (Ti), gold (Au), silver (Ag), molybdenum (Mo), copper (Cu), tungsten (W), and chromium (Cr). Those skilled in the art can set the above-mentioned first electrode and second electrode according to the actual application needs, and there is no limitation here.
[0093] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-16As shown, it also includes: a flexible circuit board (FPC, not shown) disposed inside the back frame 5 and electrically connected to the display module 1, and a printed circuit board (PCB, not shown) disposed outside the back frame 5; the first electrode and the second electrode of the piezoelectric device 3 are respectively electrically connected to the flexible circuit board, and the flexible circuit board is electrically connected to the printed circuit board through the opening 41. In this way, the first electrode and the second electrode of the piezoelectric device 3 are led out through the flexible circuit board to the printed circuit board outside the back frame 5 to realize the transmission of electrical signals.
[0094] The haptic feedback panel provided in this disclosure is not limited to automotive modules, but can also be applied to fields such as medical devices, automotive electronics, and motion tracking systems. It is particularly suitable for wearable devices, external or implantable medical monitoring and treatment, or applications in fields such as artificial intelligence-based electronic skin. Specifically, the haptic feedback panel can be applied to devices that generate vibrations and mechanical properties, such as automotive components, brake pads, keyboards, mobile terminals, and game controllers.
[0095] Based on the same inventive concept, this disclosure also provides a display device, including the haptic feedback panel described above. Since the principle by which this display device solves the problem is similar to that of the aforementioned haptic feedback panel, the implementation of this display device can refer to the implementation of the aforementioned haptic feedback panel, and repeated details will not be elaborated further. This display device can be an in-vehicle display device.
[0096] In specific implementations, the display device provided in the embodiments of this disclosure may also include other functional structures well known to those skilled in the art, which will not be described in detail here.
[0097] This disclosure provides a haptic feedback panel and display device. A piezoelectric device can excite a cover plate to resonate at a specific frequency, achieving a strong haptic feedback effect. For example, a high-frequency vibrating cover plate creates a pressure film effect with the finger surface, which changes the coefficient of friction between the finger and the plate, thus achieving a change in texture tactile sensation. A low-frequency vibrating cover plate interacts with the finger to achieve vibration haptic feedback. Furthermore, by configuring the support layer to include an opening, the resonant frequency and vibration mode of the cover plate can be changed by adjusting the connection strength between the support layer and the cover plate, achieving strong vibration of the cover plate.
[0098] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.
[0099] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.
Claims
1. A haptic feedback panel, wherein, include: Display module; A cover plate is disposed on the light-emitting side of the display module, and the size of the cover plate is larger than the size of the display module; Multiple piezoelectric devices are disposed on the same side of the cover plate as the display module, and the multiple piezoelectric devices are disposed on at least one opposite side of the display module; A support layer is disposed on the same side of the cover plate as the piezoelectric device and at least on one side of the display module. The orthographic projection of the support layer on the cover plate does not overlap with the orthographic projection of the piezoelectric device on the cover plate. At least a portion of the support layer has multiple openings that disconnect the support layer. The back frame has a receiving space for supporting the display module, and the back frame is fixedly connected to the support layer; A flexible circuit board disposed within the back frame and electrically connected to the display module, and a printed circuit board disposed outside the back frame; the first electrode and the second electrode of the piezoelectric device are respectively electrically connected to the flexible circuit board, and the flexible circuit board is electrically connected to the printed circuit board through the opening.
2. The haptic feedback panel as described in claim 1, wherein, The support layer is disposed around the display module, and the support layer has at least the plurality of openings in the area adjacent to the piezoelectric device.
3. The haptic feedback panel as described in claim 2, wherein, The cover plate has a pair of long sides arranged opposite each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is disposed on one side of the pair of long sides near the cover plate.
4. The haptic feedback panel as described in claim 2, wherein, The cover plate has a pair of long sides arranged opposite each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is disposed on one side of the pair of short sides near the cover plate.
5. The haptic feedback panel as described in claim 4, wherein, The piezoelectric devices are arranged around the cover plate.
6. The haptic feedback panel as described in any one of claims 2-5, wherein, The opening is provided in a one-to-one correspondence with the piezoelectric device, the length of the opening along the arrangement direction of the piezoelectric device is greater than or equal to the length of the piezoelectric device along the arrangement direction of the piezoelectric device, and the piezoelectric device is disposed in at least a portion of the space of the opening.
7. The haptic feedback panel as claimed in claim 6, wherein, The center of the piezoelectric device coincides with the center of the opening.
8. The haptic feedback panel as claimed in claim 6, wherein, The orthographic projection of the piezoelectric device on the cover plate and the orthographic projection of the opening on the cover plate have an overlapping area, and the center of the piezoelectric device and the center of the opening do not coincide.
9. The haptic feedback panel as claimed in claim 6, wherein, It also includes a protective layer disposed on the side of each of the piezoelectric devices away from the cover plate. The protective layer covers the surface of the piezoelectric device away from the cover plate and covers the side of the piezoelectric device that is not in contact with the support layer. The protective layer is disposed in contact with the cover plate.
10. The haptic feedback panel as claimed in claim 9, wherein, The thickness of the support layer is greater than the maximum thickness of the protective layer.
11. The haptic feedback panel as described in any one of claims 2-5, wherein, Each side of the support layer has multiple openings that disconnect the support layer, and the piezoelectric device is disposed between the support layer and the display module.
12. The haptic feedback panel as claimed in claim 11, wherein, The number of openings on each side of the support layer is less than the number of piezoelectric devices.
13. The haptic feedback panel as claimed in claim 11, wherein, It also includes a protective layer disposed on the side of the piezoelectric device away from the cover plate, the protective layer covering the surface of the piezoelectric device away from the cover plate and the side of the piezoelectric device, and the protective layer is a closed ring surrounding the display module.
14. The haptic feedback panel as claimed in claim 9, wherein, The protective layer is made of materials including green oil or conformal coating.
15. The haptic feedback panel as described in any one of claims 1-5, wherein, The piezoelectric device is positioned at the crest and / or trough of the mechanical wave that drives the cover plate to vibrate.
16. The haptic feedback panel as described in any one of claims 1-5, wherein, The material of the support layer includes at least one of rubber, foam, cotton foam, and polydimethylsiloxane.
17. The haptic feedback panel as described in any one of claims 1-5, wherein, The display module includes a display panel and a backlight stacked on the side of the cover plate facing the back frame.
18. The haptic feedback panel as described in any one of claims 1-5, wherein, The piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode stacked together. The first electrode of each piezoelectric device is grounded. The second electrodes of each piezoelectric device located on the same side of the display module are electrically connected to the same driving voltage terminal, and the second electrodes of the piezoelectric devices located on different sides of the display module are electrically connected to different driving voltage terminals.
19. The haptic feedback panel as described in any one of claims 1-5, wherein, The structure of the piezoelectric device is a piezoelectric thin film or a piezoelectric ceramic block.
20. The haptic feedback panel as described in any one of claims 1-5, wherein, The cover plate includes a cover plate for the surface of a laptop display module, a cover plate for the surface of a vehicle display module, or a cover plate for the surface of a mobile terminal display module.
21. A display device, wherein, Including the haptic feedback panel as described in any one of claims 1 to 20.