Haptic feedback panel and display apparatus

Abstract

A haptic feedback panel and a display apparatus. The haptic feedback panel comprises: a display module; a cover plate, arranged on a light-emitting side of the display module, the size of the cover plate being greater than the size of the display module; a plurality of piezoelectric devices, arranged on the same side of the cover plate as the display module, the plurality of piezoelectric devices at least being arranged on one opposite side of the display module; a supporting layer, arranged on the same side of the cover plate as the piezoelectric devices and at least arranged on one side of the display module, wherein the orthographic projection of the supporting layer on the cover plate does not overlap with the orthographic projections of the piezoelectric devices on the cover plate, and at least a portion of the supporting layer has a plurality of openings that cause the supporting layer to be discontinuous; and a back frame, having an accommodating space used for bearing the display module, the back frame being fixedly connected to the supporting layer.

Description

Tactile feedback panel and display device Technical Field

[0001] The present disclosure relates to the field of tactile feedback technology, and in particular to a tactile feedback panel and a display device. Background Art

[0002] Haptics is a key area of ​​current technological development. Specifically, haptics enables devices to interact with the human body through touch.

[0003] Summary of the Invention

[0004] The present disclosure provides a tactile feedback panel and a display device, and the specific solutions are as follows:

[0005] An embodiment of the present disclosure provides a tactile feedback panel, comprising:

[0006] Display module;

[0007] a cover plate, disposed on the light-emitting side of the display module, wherein the size of the cover plate is larger than the size of the display module;

[0008] a plurality of piezoelectric devices, disposed on the same side of the cover plate as the display module, and the plurality of piezoelectric devices are disposed on at least one opposite side of the display module;

[0009] a support layer disposed on the same side of the cover plate as the piezoelectric device and at least on one side of the display module, wherein an orthographic projection of the support layer on the cover plate does not overlap with an orthographic projection of the piezoelectric device on the cover plate, and at least a portion of the support layer has a plurality of openings that disconnect the support layer;

[0010] The back frame has a receiving space for carrying the display module, and the back frame is fixedly connected to the supporting layer.

[0011] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the supporting layer is disposed around the display module, and at least a region of the supporting layer adjacent to the piezoelectric device has the multiple openings.

[0012] In a possible implementation, in the above-mentioned tactile feedback panel provided in an embodiment of the present disclosure, the cover plate has a pair of long sides arranged opposite to each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is arranged on one side close to the pair of long sides of the cover plate.

[0013] In a possible implementation, in the above-mentioned tactile feedback panel provided in an embodiment of the present disclosure, the cover plate has a pair of long sides arranged opposite to each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is arranged on one side close to the pair of short sides of the cover plate.

[0014] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the piezoelectric device is arranged around the cover plate.

[0015] In a possible implementation, in the above-mentioned tactile feedback panel provided in an embodiment of the present disclosure, the opening is arranged 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 arranged in at least a portion of the space of the opening.

[0016] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the center of the piezoelectric device coincides with the center of the opening.

[0017] In a possible implementation, in the above-mentioned tactile feedback panel provided in an embodiment of the present 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.

[0018] In a possible implementation, the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure further includes a protective layer arranged 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 arranged in contact with the cover plate.

[0019] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the thickness of the supporting layer is greater than the maximum thickness of the protective layer.

[0020] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, each side of the supporting layer has a plurality of openings for disconnecting the supporting layer, and the piezoelectric device is disposed between the supporting layer and the display module.

[0021] In a possible implementation, in the tactile feedback panel provided by an embodiment of the present disclosure, the number of openings on each side of the support layer is less than the number of the piezoelectric devices.

[0022] In a possible implementation, the tactile feedback panel provided in the embodiment of the present disclosure further includes a protective layer arranged on the side of the 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, and the protective layer is a closed ring arranged around the display module.

[0023] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the material of the protective layer includes green oil or conformal paint.

[0024] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the piezoelectric device is disposed at the position of a crest and / or a trough of a mechanical wave that drives the cover plate to vibrate.

[0025] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the material of the supporting layer includes at least one of rubber, foam, foam cotton, and polydimethylsiloxane.

[0026] In a possible implementation, in the tactile feedback panel provided in an embodiment of the present disclosure, the display module includes a display panel and a backlight stacked on a side of the cover plate facing the back frame.

[0027] In a possible implementation, in the above-mentioned tactile feedback panel provided in an embodiment of the present disclosure, the piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode that are stacked, the first electrode of each of the piezoelectric devices is grounded, the second electrodes of each of the piezoelectric devices located on the same side of the display module are electrically connected to the same driving voltage end, and the second electrodes of the piezoelectric devices located on different sides of the display module are electrically connected to different driving voltage ends.

[0028] In a possible implementation, the tactile feedback panel provided in the embodiment of the present disclosure further includes: a flexible circuit board arranged in the back frame and electrically connected to the display module, and a printed circuit board arranged 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.

[0029] In a possible implementation, in the tactile feedback panel provided in the embodiment of the present disclosure, the structure of the piezoelectric device is a piezoelectric film or a piezoelectric ceramic block.

[0030] In a possible implementation, in the tactile feedback panel provided in the embodiment of the present disclosure, the cover plate includes a cover plate on the surface of a notebook display module, a cover plate on the surface of a vehicle display module, or a cover plate on the surface of a mobile terminal display module.

[0031] Correspondingly, an embodiment of the present disclosure further provides a display device, comprising the tactile feedback panel as described in any one of the above embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0033] FIG2 is a schematic cross-sectional view taken along the CC' direction in FIG1 ;

[0034] FIG3 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0035] FIG4 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0036] FIG5 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0037] FIG6 is a schematic cross-sectional view taken along the CC' direction in FIG5;

[0038] FIG7 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0039] FIG8 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0040] FIG9 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0041] FIG10 is a schematic cross-sectional view taken along the CC' direction in FIG9;

[0042] FIG11 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0043] FIG12 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0044] FIG13 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0045] FIG14 is a schematic cross-sectional view taken along the CC' direction in FIG13;

[0046] FIG15 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0047] FIG16 is a schematic diagram of a planar structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0048] FIG17 shows the corresponding vibration waveform when the piezoelectric device is arranged on one side of a pair of short sides of the cover;

[0049] FIG18 shows the corresponding vibration waveform when the piezoelectric device is arranged on one side of a pair of long sides of the cover. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0051] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words “include” or “comprise” and the like used in this disclosure mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words “connect” or “connected” and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Inside”, “outside”, “upper”, “lower”, etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0052] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0053] Vibration-based tactile devices typically utilize a piezoelectric sheet, linear motor, or piezoelectric film attached to a substrate and pulsed excitation to create touch functions such as virtual buttons. However, linear motors, due to their low mass, struggle to vibrate large screen modules (such as automotive displays) and provide tactile feedback.

[0054] An embodiment of the present disclosure provides a tactile feedback panel, as shown in Figures 1 to 16. Figures 1, 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, and 16 are respectively schematic diagrams of the planar structure of the tactile feedback panel. Figure 2 is a schematic cross-sectional view taken along the CC' direction in Figure 1, Figure 6 is a schematic cross-sectional view taken along the CC' direction in Figure 5, Figure 10 is a schematic cross-sectional view taken along the CC' direction in Figure 9, and Figure 14 is a schematic cross-sectional view taken along the CC' direction in Figure 13. The tactile feedback panel includes:

[0055] Display module 1;

[0056] The cover plate 2 is provided on the light-emitting side of the display module 1, and the size of the cover plate 2 is larger than that of the display module 1;

[0057] A plurality of piezoelectric devices 3 are disposed on the same side of the cover plate 2 as the display module 1, and the plurality of piezoelectric devices 3 are disposed on at least one opposite side of the display module 1;

[0058] A 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 a portion of the support layer 4 has a plurality of openings 41 that interrupt the support layer 4.

[0059] The back frame 5 has a receiving space for carrying the display module 1 , and the back frame 5 is fixedly connected to the support layer 4 .

[0060] The tactile feedback panel provided in the embodiments of the present disclosure can achieve strong tactile feedback by stimulating the cover plate to resonate at a specific frequency through a piezoelectric device. For example, a high-frequency vibrating cover plate and the surface of a finger produce a squeeze film effect, which can change the coefficient of friction between the finger and the plate, thereby achieving a change in texture tactile sensation; a low-frequency vibrating cover plate interacts with the finger to achieve vibratory 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.

[0061] In specific implementation, for the vehicle-mounted display module, due to its large mass, it is difficult to generate texture tactile feedback through traditional linear motor excitation. Therefore, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 1 to 16, the structure of the piezoelectric device 3 can be a piezoelectric film or a piezoelectric ceramic block. By using the piezoelectric film or 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, so that the tactile feedback panel produces a tactile feedback effect, and further adjusts the tactile feedback through the film effect.

[0062] In specific implementation, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 1 to 16, the cover 2 is a structure that directly contacts the tactile senses such as fingers, and can be a cover on the surface of a notebook display module, a cover on the surface of a vehicle-mounted display module, a cover on the surface of a mobile terminal display module, or a cover on the surface of a display module for other application scenarios, etc.

[0063] In a specific implementation, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 1, 3, 4, 5, 7, 8, 9, 11, 12, 13, 15 and 16, the support layer 4 can be arranged around the display module 1, and the support layer 4 has a plurality of openings 41 at least in the area adjacent to the piezoelectric device 3. In this way, on the one hand, the large-area arrangement 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, thereby achieving strong vibration of the cover plate 2; on the other hand, the support layer 4 has a plurality of openings 41 at least 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 to the printed circuit board outside the back frame 5 through the openings 41 nearby through the flexible circuit board, thereby achieving transmission of electrical signals.

[0064] In a specific implementation, in the tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 3, 7, 11, and 15, the cover plate 2 has a pair of long sides 21 disposed opposite each other and a pair of short sides 22 connected to the pair of long sides 21. For a tactile feedback panel that only needs to stimulate the long sides 21 of the cover plate 2 to generate vibration, the piezoelectric device 3 can be disposed only on one side close to the pair of long sides 21 of the cover plate 2. This can reduce the number of piezoelectric devices 3, reduce costs, and reduce power consumption.

[0065] In a specific implementation, in the tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 4, 5, 8, 12, and 16, the cover plate 2 has a pair of long sides 21 disposed opposite each other and a pair of short sides 22 connected to the pair of long sides 21. For a tactile feedback panel that only needs to stimulate the short sides 22 of the cover plate 2 to generate vibration, the piezoelectric device 3 can be disposed only on one side close to the pair of short sides 22 of the cover plate 2. This can reduce the number of piezoelectric devices 3, reduce costs, and reduce power consumption.

[0066] In a specific implementation, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 1, 3, 5, 9 and 13, for a tactile feedback panel that needs to stimulate vibration on all four sides of the cover plate 2, the piezoelectric device 3 can be arranged on all four sides of the cover plate 2.

[0067] Optionally, the present disclosure can adjust the arrangement of piezoelectric devices on the cover plate to make the cover plate generate high-frequency resonance, and achieve tactile feedback adjustment through the squeeze film effect.

[0068] In a specific implementation, in order to improve the tactile feedback effect, in the above-mentioned tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 1, 3, 4, 5, 7, 8, 9, 11, 12, 13, 15 and 16, the piezoelectric device 3 can be arranged at the peak and / or trough of the mechanical wave that drives the cover plate 2 to vibrate. Compared with piezoelectric devices not arranged at the peak or trough positions, the piezoelectric devices 3 arranged at the peak or trough positions have higher excitation efficiency. For example, under the same driving voltage, the vibration displacement of the piezoelectric devices 3 at the peak or trough positions is larger, thereby improving the tactile feedback effect.

[0069] Optionally, the piezoelectric devices in the embodiment of the present disclosure can all be set at the peak position of the cover plate vibration, or all be set at the trough position of the cover plate vibration, or part can be set at the peak position of the cover plate vibration and the other part can be set at the trough position of the cover plate vibration.

[0070] Specifically, when piezoelectric devices are set at both the peak position and the trough position, when realizing the tactile feedback function, the frequency of the AC voltage signal loaded by the piezoelectric device at the peak position needs to be the same as the frequency of the AC voltage signal loaded by the piezoelectric device at the trough position, but the phase of the AC voltage signal loaded by the piezoelectric device at the peak position is 180° different from the phase of the AC voltage signal loaded by the piezoelectric device at the trough position, so as to achieve the vibration effect of the cover along the peaks and troughs.

[0071] In actual applications, the changed natural frequency and natural vibration mode can be first determined through simulation based on the parameters of the cover itself, such as mass, shape, material, etc. (when there are multiple natural frequencies and natural vibration modes, the natural frequency and natural vibration mode with relatively large amplitude are selected), the peak and trough positions of the changed vibration can be determined, and then the piezoelectric device can be set at the peak and / or trough position. Of course, the piezoelectric device can be set near the peak or trough position according to actual needs to be compatible with the various natural vibration modes of the cover. The specific position of the piezoelectric device on the cover can be adjusted with the maximum amplitude as the goal, and the embodiments of the present disclosure are not limited to this.

[0072] In a specific implementation, in the tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 1, 3, 4, 5, 7, 8, 9, 11, and 12, openings 41 are provided in a one-to-one correspondence with piezoelectric devices 3. The length of openings 41 along the direction in which piezoelectric devices 3 are arranged is greater than or equal to the length of piezoelectric devices 3 along the direction in which piezoelectric devices 3 are arranged. Piezoelectric devices 3 are provided within at least a portion of the space within openings 41. By providing piezoelectric devices 3 within at least a portion of the space within openings 41 of support layer 4, the space occupied by piezoelectric devices 3 and support layer 4 on cover plate 2 outside display module 1 can be reduced, thereby reducing the width of cover plate 2 outside display module 1 and thereby reducing the bezel of the tactile feedback panel.

[0073] It should be noted that, as shown in Figures 1, 3, 4, 5, 7, 8, 9, 11 and 12, the embodiments of the present disclosure are described 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, the length of the opening 41 along the arrangement direction of the piezoelectric device 3 can also be equal to the length of the piezoelectric device 3 along the arrangement direction of the piezoelectric device 3.

[0074] In a specific implementation, in order to make the border of the tactile feedback panel as low as possible and the piezoelectric device exactly located at the peak or trough of the vibration of the cover plate, the parameters of the cover plate itself, such as mass, shape, material, etc., can be adjusted so that the peak or trough is exactly located at the center of the opening. Therefore, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 1, 3 and 4, the center of the piezoelectric device 3 can coincide with the center of the opening 41, so that the space occupied by the piezoelectric device 3 and the supporting layer 4 on the outer cover plate 2 of the display module 1 can be minimized, and the piezoelectric device 3 can also be set at the position of the peak and / or trough, thereby improving the excitation efficiency and thus improving the tactile feedback effect.

[0075] In a specific implementation, in order to minimize the border of the tactile feedback panel, even if the parameters of the cover itself, such as mass, shape, material, etc., are adjusted, it is not necessarily possible to make the peak or trough of the vibration of the cover exactly located at the center of the opening. For example, there may be a certain deviation between the position of the peak or trough and the center of the opening. For example, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 5, 7, 8, 9, 11 and 12, the orthographic projection of the piezoelectric device 3 on the cover 2 and the orthographic projection of the opening 41 on the cover 2 have an overlapping area, and the center of the piezoelectric device 3 does not coincide with the center of the opening 41. In this way, on the one hand, the space occupied by the piezoelectric device 3 and the support layer 4 on the outer cover 2 of the display module 1 can be reduced, and the piezoelectric device 3 can also be set at the position of the peak and / or trough, thereby improving the excitation efficiency and thus improving the tactile feedback effect.

[0076] Optionally, as shown in Figures 5, 7 and 8, the peak 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 arranged between the center of the opening 41 and the outer edge of the cover plate 2; as shown in Figures 9, 11 and 12, 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 arranged between the center of the opening 41 and the display module 1.

[0077] Alternatively, as shown in FIG5 , FIG7 , FIG8 , FIG9 , FIG11 and FIG12 , the distance between the center of the piezoelectric device 3 and the center of the opening 41 is determined according to actual positions of peaks and troughs of vibration of the cover plate 2 .

[0078] As shown in Figure 17, Figure 17 is the corresponding vibration waveform when the piezoelectric device is set on one side of a pair of short sides close to the cover plate, so the center of the piezoelectric device located on the short side should correspond to the peak or trough position of Figure 17; as shown in Figure 18, Figure 18 is the corresponding vibration waveform when the piezoelectric device is set on one side of a pair of long sides close to the cover plate, so the center of the piezoelectric device located on the long side should correspond to the peak or trough position of Figure 18.

[0079] In a specific implementation, the tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 1 to 12, further includes a protective layer 6 disposed on the side of each piezoelectric device 3 facing away from the cover plate 2. The protective layer 6 is not shown in Figures 1, 3, 4, 5, 7, 8, 9, 11, and 12. The protective layer 6 covers the surface of the piezoelectric device 3 facing 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 disposed 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, isolating the piezoelectric device 3 from contact with the outside air, and improving the high-humidity resistance of the tactile feedback panel.

[0080] In specific implementation, since the supporting layer mainly serves to connect the cover plate and the back frame, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 2, 6 and 10, the thickness of the supporting 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 supporting layer 4.

[0081] Optionally, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, the material of the supporting layer may include but is not limited to at least one of rubber, foam, foam cotton, and polydimethylsiloxane (PDMS), and these materials can fix the cover plate and the back frame well.

[0082] In a specific implementation, in the tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 13 to 16, each side of the support layer 4 has a plurality of openings 41 that disconnect the support layer 4. The peak or trough of the vibration of the cover plate 2 may be located between the support layer 4 and the display module 1. In this way, the piezoelectric device 3 is disposed between the support layer 4 and the display module 1 so that the piezoelectric device 3 is disposed at the peak or trough of the vibration of the cover plate 2. In addition, by disposing the piezoelectric device 3 between the support layer 4 and the display module 1, the piezoelectric device 3 is located in the sealed space formed by the back frame 5 and the support layer 4, thereby further isolating the piezoelectric device 3 from contact with the outside air, further improving the high-humidity resistance of the tactile feedback panel.

[0083] In specific implementation, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 13, 15 and 16, the number of openings 41 on each side of the support layer 4 can be less than the number of piezoelectric devices 3, but of course it is not limited to this.

[0084] In a specific implementation, the tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 13 to 16, further includes a protective layer 6 arranged on the side of the piezoelectric device 3 facing away from the cover plate 2. The protective layer 6 is not shown in Figures 13, 15 and 16. The protective layer 6 covers the surface of the piezoelectric device 3 facing away from the cover plate 2 and covers the side of the piezoelectric device 3, and the protective layer 6 is a closed ring arranged around 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, and can isolate the piezoelectric device 3 from contact with the outside air, thereby improving the high-humidity resistance of the tactile feedback panel. In addition, the closed ring structure of the protective layer 6 can reduce the manufacturing process of the protective layer 6.

[0085] Optionally, the material of the protective layer may include but is not limited to green paint or conformal paint.

[0086] In a specific implementation, in the above-mentioned tactile feedback panel provided in the embodiment of the present disclosure, as shown in Figures 1 to 16, 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, wherein the display panel is a vehicle-mounted liquid crystal display panel. The present disclosure adopts a piezoelectric film or a piezoelectric ceramic block, and 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, so that the tactile feedback panel produces a tactile feedback effect, and further adjusts the tactile feedback through the squeeze film effect.

[0087] It should be noted that the display panel and backlight in the display module provided in the embodiment of the present disclosure have the same structure as those in the prior art and will not be described in detail here.

[0088] In a specific implementation, in the tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 1 to 16 , the piezoelectric device 3 may include a first electrode, a piezoelectric layer, and a second electrode that are stacked. The first electrode of each piezoelectric device 3 is grounded. The second electrodes of the piezoelectric devices 3 on the same side of the display module 1 may be electrically connected to the same drive voltage terminal, while the second electrodes of the piezoelectric devices 3 on different sides of the display module 1 may be electrically connected to different drive voltage terminals. In this way, all the piezoelectric devices 3 on the same side of the display module 1 can be driven as a whole, which can reduce power consumption.

[0089] Optionally, the embodiment of the present disclosure may also drive each piezoelectric device independently, or may drive all the piezoelectric devices on the cover plate as a whole, depending on actual needs.

[0090] In a specific 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, so that an alternating electric field can be formed between the first electrode and the second electrode, and the frequency of the alternating electric field is 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 the vibration signal is the same as the frequency of the alternating electric field. When the frequency of the vibration signal is close to or equal to the natural frequency of the cover, the change resonates, the amplitude is enhanced, and a tactile feedback signal is generated. When the finger touches the changed surface, the change in friction can be clearly felt. In practical applications, the friction of the surface can be adjusted by the resonance generated between the piezoelectric layer and the change, thereby achieving texture reproduction of the object on the changed surface.

[0091] In a specific implementation, in the tactile feedback panel provided in the embodiment of the present disclosure, the material of the first electrode may be a transparent material. For example, the material of the first electrode may include at least one of ITO, IZO, IGZO, and AZO.

[0092] In a specific implementation, the material of the second electrode is generally ITO, but is not limited thereto.

[0093] Of course, in the specific implementation process, 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, it 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 actual application needs, and there is no limitation here.

[0094] In a specific implementation, the tactile feedback panel provided in the embodiments of the present disclosure, as shown in Figures 1 to 16, further includes: a flexible circuit board (FPC, not shown) disposed within 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 and second electrodes of the piezoelectric device 3 are respectively electrically connected to the flexible circuit board, which is electrically connected to the PCB through an opening 41. In this way, the first and second electrodes of the piezoelectric device 3 are led out through the flexible circuit board to the PCB outside the back frame 5, enabling transmission of electrical signals.

[0095] The tactile feedback panels provided by the embodiments of the present disclosure are not limited to applications in vehicle-mounted modules; they can also be applied to medical, automotive electronics, sports tracking systems, and other fields. They are particularly suitable for wearable devices, medical monitoring and treatment applications outside the body or implanted within the human body, and applications in areas such as electronic skin for artificial intelligence. Specifically, the tactile feedback panels can be applied to devices that generate vibration and mechanical properties, such as vehicle-mounted devices, brake pads, keyboards, mobile terminals, and game controllers.

[0096] Based on the same inventive concept, embodiments of the present disclosure also provide a display device comprising the aforementioned tactile feedback panel. Because the principles underlying the display device are similar to those of the aforementioned tactile feedback panel, the implementation of the display device can be referenced to the aforementioned tactile feedback panel, and any repetitions will not be repeated. The display device can be an in-vehicle display device.

[0097] In specific implementation, the display device provided in the embodiment of the present disclosure may further include other functional structures well known to those skilled in the art, which will not be described in detail here.

[0098] The disclosed embodiments provide a tactile feedback panel and display device that can achieve strong tactile feedback by stimulating a cover plate at a specific frequency through a piezoelectric device. For example, a high-frequency vibrating cover plate and the surface of a finger produce a squeeze film effect, which can change the coefficient of friction between the finger and the plate, thereby achieving a change in textured tactile sensation. A low-frequency vibrating cover plate interacts with the finger to achieve vibrotactile 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.

[0099] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0100] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if such changes and modifications of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such changes and modifications.

Claims

1. A tactile feedback panel, wherein: include: Display module; A cover plate, arranged on the light-emitting side of the display module, wherein the size of the cover plate is larger than the size of the display module; A plurality of piezoelectric devices are arranged on the same side of the cover plate as the display module, and the plurality of piezoelectric devices are arranged on at least one opposite side of the display module; A support layer is arranged 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, and at least part of the support layer has a plurality of openings that disconnect the support layer; The back frame has a containing space for carrying the display module, and the back frame is fixedly connected to the supporting layer.

2. The tactile feedback panel according to claim 1, wherein: The support layer is disposed around the display module, and at least a region of the support layer adjacent to the piezoelectric device has the plurality of openings.

3. The tactile feedback panel according to claim 2, wherein: The cover plate has a pair of long sides arranged opposite to each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is arranged on one side close to the pair of long sides of the cover plate.

4. The tactile feedback panel according to claim 2, wherein: The cover plate has a pair of long sides arranged opposite to each other and a pair of short sides connected to the pair of long sides, and the piezoelectric device is arranged on one side close to the pair of short sides of the cover plate.

5. The tactile feedback panel according to claim 4, wherein: The piezoelectric device is arranged around the cover plate.

6. The tactile feedback panel according to any one of claims 2 to 5, wherein: The openings are arranged in one-to-one correspondence with the piezoelectric devices, the length of the openings along the arrangement direction of the piezoelectric devices is greater than or equal to the length of the piezoelectric devices along the arrangement direction of the piezoelectric devices, and the piezoelectric devices are arranged in at least a portion of the space of the openings.

7. The tactile feedback panel according to claim 6, wherein: The center of the piezoelectric device coincides with the center of the opening.

8. The tactile feedback panel according to 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 tactile feedback panel according to any one of claims 6 to 8, wherein: It also includes a protective layer arranged on the side of each piezoelectric device 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 not in contact with the support layer, and the protective layer is arranged in contact with the cover plate.

10. The tactile feedback panel of claim 9, wherein: The thickness of the supporting layer is greater than the maximum thickness of the protective layer.

11. The tactile feedback panel according to any one of claims 2 to 5, wherein: Each side edge of the support layer has a plurality of openings for breaking the support layer, and the piezoelectric device is arranged between the support layer and the display module.

12. The tactile feedback panel of claim 11, wherein: The number of openings on each side of the support layer is less than the number of the piezoelectric devices.

13. The tactile feedback panel according to claim 11 or 12, wherein: It also includes a protective layer arranged 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 covers the side of the piezoelectric device, and the protective layer is a closed ring arranged around the display module.

14. The tactile feedback panel according to claim 9 or 13, wherein: The material of the protective layer includes green oil or three-proof paint.

15. The tactile feedback panel according to any one of claims 1 to 14, wherein: The piezoelectric device is disposed at the location of a crest and / or a trough of a mechanical wave that drives the cover plate to vibrate.

16. The tactile feedback panel according to any one of claims 1 to 15, wherein: The material of the support layer includes at least one of rubber, foam, foam cotton, and polydimethylsiloxane.

17. The tactile feedback panel according to any one of claims 1 to 16, wherein: The display module comprises a display panel and a backlight which are stacked and arranged on a side of the cover plate facing the back frame.

18. The tactile feedback panel according to any one of claims 1 to 17, wherein: The piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode which are stacked together. The first electrode of each of the piezoelectric devices is grounded. The second electrodes of the piezoelectric devices 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 on different sides of the display module are electrically connected to different driving voltage terminals.

19. The tactile feedback panel according to any one of claims 1 to 18, wherein: Also includes: A flexible circuit board disposed in 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 electrically connected to the flexible circuit board, respectively, and the flexible circuit board is electrically connected to the printed circuit board through the opening.

20. The tactile feedback panel according to any one of claims 1 to 19, wherein: The structure of the piezoelectric device is a piezoelectric film or a piezoelectric ceramic block.

21. The tactile feedback panel according to any one of claims 1 to 20, wherein: The cover plate includes a cover plate on the surface of a notebook display module, a cover plate on the surface of a vehicle-mounted display module, or a cover plate on the surface of a mobile terminal display module.

22. A display device, wherein: It comprises the tactile feedback panel as claimed in any one of claims 1 to 21.

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