Tactile feedback module, driving method thereof and tactile feedback device

Abstract

The invention discloses a tactile feedback module, a driving method thereof and a tactile feedback device, and relates to the technical field of tactile feedback. The tactile feedback module comprises a cover plate; the touch display panel is arranged on one side of the cover plate, the display surface of the touch display panel is arranged close to the cover plate, the display surface comprises two curved edges which are oppositely arranged in the first direction, and the orthographic projection of the touch display panel on the cover plate is located within the range of the cover plate; the actuators and the touch display panel are arranged on the same side of the cover plate, the actuators comprise at least one first actuator and at least one second actuator, the first actuators and the second actuators are arranged close to the curved edge, and the first actuators and the second actuators are located on different sides of a first median line; the first median line is a straight line connecting the midpoints of the two curved edges, and the actuator is used for driving the cover plate to vibrate in response to a driving signal so as to generate tactile feedback on the surface, deviating from the touch display panel, of the cover plate.

Description

Haptic feedback module and driving method thereof, and haptic feedback device TECHNICAL FIELD

[0001] The present disclosure relates to the field of haptic feedback technology, and in particular to a haptic feedback module and driving method thereof, and a haptic feedback device. BACKGROUND

[0002] Haptic feedback is a cutting-edge technology in the field of virtual reality and human-computer interaction. Multimedia terminals such as smart phones and tablet computers that apply haptic feedback technology have broad application prospects in the fields of education, entertainment, and medical treatment. With the vigorous development of new energy vehicles, vehicle-mounted display screens have become a trend, and more and more physical buttons, knobs, and other interactive components are implemented on touch display screens.

[0003] SUMMARY

[0004] The present disclosure provides a haptic feedback module, comprising:

[0005] a cover plate;

[0006] a touch display panel disposed on one side of the cover plate, a display surface of the touch display panel being disposed close to the cover plate, the display surface comprising two curved edges disposed opposite along a first direction, a normal projection of the touch display panel on the cover plate being within a range of the cover plate; and

[0007] an actuator disposed on the same side of the cover plate as the touch display panel, the actuator comprising at least one first actuator and at least one second actuator, the first actuator and the second actuator being disposed close to the curved edges, the first actuator and the second actuator being located on different sides of a first median line, the first median line being a straight line connecting midpoints of the two curved edges, the actuator being configured to drive the cover plate to vibrate in response to a driving signal, so as to generate haptic feedback on a surface of the cover plate facing away from the touch display panel.

[0008] In some embodiments, the first actuator and the second actuator disposed close to the same curved edge are an integrated structure in communication with each other, the integrated structure being a strip-shaped structure extending along the curved edge.

[0009] In some embodiments, the first actuator and the second actuator are disposed separately from each other, and normal projections of the first actuator and the second actuator on the display surface do not overlap the first median line.

[0010] In some embodiments, a plurality of the first actuators and a plurality of the second actuators are arranged along an extension direction of the curved edge; and

[0011] The distance between two adjacent first actuators, the distance between an adjacent first actuator and a second actuator, and the distance between two adjacent second actuators are substantially equal and greater than zero in the extension direction of the curved edge.

[0012] In some embodiments, the first actuator and the second actuator arranged close to the same curved edge are translationally symmetric along the extension direction of the curved edge.

[0013] In some embodiments, the display surface further comprises two straight edges arranged opposite in the second direction, the two curved edges comprise a first curved edge and a second curved edge, the first actuator arranged close to the first curved edge and the first actuator arranged close to the second curved edge are symmetric about a second median axis, the second actuator arranged close to the first curved edge and the second actuator arranged close to the second curved edge are symmetric about the second median axis, and the second median axis is a straight line connecting the midpoints of the two straight edges.

[0014] In some embodiments, the cover plate comprises a first edge arranged close to the curved edge, in the orthographic projection on the cover plate, the gap between the first edge and the curved edge comprises a first gap and a second gap, the first actuator is arranged in the first gap, the second actuator is arranged in the second gap, and the width of the first gap along the first direction is greater than or equal to the width of the second gap along the first direction.

[0015] In some embodiments, among the plurality of actuators arranged close to the same curved edge, the plurality of first actuators are arrayed along the extension direction of the curved edge and form a column, and the plurality of second actuators are arrayed along the extension direction of the curved edge and form a column.

[0016] In some embodiments, the plurality of first actuators arranged close to the same curved edge are matrixed, and the plurality of first actuators are divided into a plurality of first actuator columns along the first direction;

[0017] the plurality of second actuators arranged close to the same curved edge are matrixed, and the plurality of second actuators are divided into at least one second actuator column along the first direction; and

[0018] The number of first actuator columns arranged close to the same curved edge is greater than or equal to the number of second actuator columns.

[0019] In some embodiments, the two curved edges include a first curved edge and a second curved edge. A plurality of first actuators disposed near the first curved edge are arranged in an array along the extension direction of the first curved edge and the plurality of first actuators are formed in a column. A plurality of second actuators disposed near the second curved edge are arranged in an array along the extension direction of the second curved edge and the plurality of second actuators are formed in a column.

[0020] In some implementations, a matrix of first actuators is arranged close to the same curved edge, and the multiple first actuators are divided into multiple columns of first actuators along the first direction;

[0021] Multiple second actuators are arranged in a matrix near the same curved edge, and the multiple second actuators are divided into at least one second actuator column along the first direction; and

[0022] The two curved edges include a first curved edge and a second curved edge, and the number of first actuator rows located near the first curved edge is greater than or equal to the number of second actuator rows located near the second curved edge.

[0023] In some embodiments, the display surface further includes two straight edges disposed opposite each other along a second direction, and the actuator further includes at least one third actuator disposed close to the straight edges; and

[0024] The first actuator and the second actuator are used to generate vibration at a first frequency, and the third actuator is used to generate vibration at a second frequency, wherein the first frequency is less than the second frequency.

[0025] In some embodiments, the cover plate includes a second edge adjacent to the straight edge, and in an orthographic projection onto the cover plate, the third actuator is disposed within the gap between the second edge and the straight edge; and

[0026] The distance between the geometric center of the third actuator and the second edge is m times the first half wavelength, the distance between the geometric center of the first actuator and the second edge is n times the first half wavelength, and the distance between the geometric center of the second actuator and the second edge is k times the first half wavelength. The m, n, and k are all positive integers greater than or equal to 1, and the m, n, and k are all different from each other. The first half wavelength is half the standing wave wavelength formed by the vibration of the cover plate caused by the third actuator.

[0027] In some embodiments, the number of third actuators disposed near the same straight edge is one, and the third actuator is a strip structure extending along the straight edge.

[0028] In some embodiments, a plurality of third actuators are arranged near the straight edge, and the plurality of third actuators arranged near the straight edge are arranged along the extension direction of the straight edge.

[0029] In some embodiments, the distance between two third actuators arranged adjacent to each other along the extension direction of the straight edge is greater than zero and less than or equal to half of the width of the third actuator along the extension direction of the straight edge.

[0030] In some embodiments, the width of the first actuator along the second direction, the width of the second actuator along the second direction, and the width of the third actuator along the second direction are all less than or equal to a first half wavelength, the first half wavelength being half of the wavelength of a standing wave formed by the third actuator driving the cover plate to vibrate.

[0031] In some embodiments, the curvature of the curved edge is greater than or equal to R100; and / or

[0032] The central angle of the curved edge corresponding to the circle is greater than or equal to 90°; and / or

[0033] The thickness of the cover plate is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0034] In some embodiments, the ratio of the width of the cover plate perpendicular to the first direction to the width of the cover plate along the first direction is greater than or equal to 2 / 3 and less than or equal to 1.

[0035] In some embodiments, the two curved edges are parallel to each other, or the extensions of the two curved edges intersect, and the intersection angle is greater than 0° and less than 90°.

[0036] In some embodiments, the actuator comprises at least one of the following: a PZT piezoelectric film, a monolithic piezoelectric ceramic, a stacked piezoelectric ceramic, a cymbal piezoelectric ceramic, a monolithic polyvinylidene fluoride film, a stacked polyvinylidene fluoride film, a cymbal polyvinylidene fluoride film, and a linear motor.

[0037] The present disclosure provides a kind of tactile feedback device, comprising:

[0038] The tactile feedback module provided by any one of the embodiments; and

[0039] Drive assembly, respectively with the touch display panel and the actuator is connected, for according to the touch position of touch body on the touch display panel, output drive signal to the actuator, to make the actuator respond to the drive signal, drive the cover plate to vibrate, to generate tactile feedback on the surface of the cover plate away from the touch display panel.

[0040] The present disclosure provides a driving method of a haptic feedback module, applied to the haptic feedback module provided in any of the embodiments, a display surface of the touch display panel is used to display a first interaction area, and the driving method comprises the following steps of:

[0041] acquiring a touch position of a touch object on the touch display panel;

[0042] if the touch position is located in the first interaction area, providing driving signals with the same phase or opposite phase to the first actuator and the second actuator according to the position of the first interaction area on the display surface.

[0043] In some embodiments, the display surface comprises a first display area, a second display area and a third display area arranged in sequence along a second direction, the second direction is perpendicular to the first direction, the first center line is located in the second display area, and the step of providing driving signals with the same phase or opposite phase to the first actuator and the second actuator according to the position of the first interaction area on the display surface comprises:

[0044] if the first interaction area is located in the second display area, providing driving signals with the same phase to the first actuator and the second actuator;

[0045] if the first interaction area is located in the first display area or the third display area, providing driving signals with opposite phase to the first actuator and the second actuator.

[0046] In some embodiments, the display surface further comprises two straight edges arranged opposite along the second direction, the actuator further comprises a third actuator, the third actuator is arranged close to the straight edges, the display surface is further used to display a second interaction area, the driving signals provided to the first actuator and the second actuator have a first frequency, and after the step of acquiring the touch position of the touch object on the touch display panel, the driving method further comprises the following steps of:

[0047] if the touch position is located in the second interaction area, providing driving signals with a second frequency to the third actuator, the second frequency is greater than the first frequency, and the driving signals provided to the third actuator arranged close to the two straight edges have the same phase or opposite phase.

[0048] The above description is only a summary of the technical solutions of the present disclosure, in order to more clearly understand the technical means of the present disclosure, the contents of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific embodiments of the present disclosure are described below.

[0049] Brief Description of Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art description. Obviously, the drawings in the following description are some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. It should be noted that the proportions in the drawings are only for illustration and do not represent actual proportions.

[0051] FIG. 1 exemplarily shows application scenarios of two curved screens;

[0052] FIG. 2 exemplarily shows a planar structure schematic diagram of a first haptic feedback module;

[0053] FIG. 3 exemplarily shows a planar structure schematic diagram of a second haptic feedback module;

[0054] FIG. 4 exemplarily shows a planar structure schematic diagram of a third haptic feedback module;

[0055] FIG. 5 exemplarily shows a planar structure schematic diagram of a fourth haptic feedback module;

[0056] FIG. 6 exemplarily shows a planar structure schematic diagram of a fifth haptic feedback module;

[0057] FIG. 7 exemplarily shows a planar structure schematic diagram of a sixth haptic feedback module;

[0058] FIG. 8 exemplarily shows a planar structure schematic diagram of a seventh haptic feedback module;

[0059] FIG. 9 exemplarily shows a partition structure schematic diagram of a display surface;

[0060] FIG. 10 exemplarily shows two low-frequency vibration modes of a curved screen;

[0061] FIG. 11 exemplarily shows two high-frequency vibration modes of a curved screen;

[0062] FIG. 12 exemplarily shows a planar structure schematic diagram of a haptic feedback module and a cross-sectional structure schematic diagram of a cover plate;

[0063] FIG. 13 exemplarily shows a waveform diagram of a driving signal;

[0064] FIG. 14 exemplarily shows a waveform diagram of another driving signal;

[0065] FIG. 15 exemplarily shows a structure schematic diagram of a haptic feedback device.

[0066] DETAILED DESCRIPTION

[0067] To make the purposes, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0068] In the related art, haptic feedback is mainly realized in the following two ways. One is to generate low-frequency vibration to simulate button haptic feedback through an actuator. The other is to generate a compression film effect through high-frequency vibration of the actuator to drive a structure, and then change the friction coefficient between the finger and the touch surface to simulate texture haptic feedback. Through haptic feedback, virtual button functions can be realized on the touch surface, such as vibration feedback effects of buttons, and friction texture effects of knobs and bars. The related technology can achieve good haptic feedback effects on the touch surface of a flat screen.

[0069] However, for a curved screen such as the vehicle display shown in a of FIG. 1 and the flexible curved wrist machine shown in b, since the curved screen has an arc, if the same actuator design as the flat screen is used, uniform haptic feedback cannot be achieved. Referring to FIG. 10, two low-frequency vibration modes of a curved screen are shown. Since the vibration directions on both sides of the wave node WN are opposite, the amplitude near the wave node WN is small and the vibration sensation is weak, and the amplitude near the wave crest / wave trough far from the wave node WN is large and the vibration sensation is strong. As shown in FIG. 10, in the vibration mode shown in a, the wave node WN is located in the first display area AA1 and the third display area AA3, and the wave crest / wave trough is located in the second display area AA2. Therefore, when the virtual button is located in the first display area AA1 or the third display area AA3, the vibration sensation is weak, and when the virtual button is located in the second display area AA2, the vibration sensation is strong. In the vibration mode shown in b, the wave node WN is located in the second display area AA2, and the wave crest / wave trough is located in the first display area AA1 and the third display area AA3. Therefore, when the virtual button is located in the second display area AA2, the vibration sensation is weak, and when the virtual button is located in the first display area AA1 or the third display area AA3, the vibration sensation is strong.

[0070] To solve the above problems, the present disclosure provides a haptic feedback module, as shown in any one of FIGS. 3-8. The haptic feedback module includes a cover plate 21, a touch display panel 22 disposed on one side of the cover plate 21, a display surface S of the touch display panel 22 disposed close to the cover plate 21, the display surface S including two curved edges QB disposed opposite each other along a first direction f1, a normal projection of the touch display panel 22 on the cover plate 21 being within a range of the cover plate 21, and an actuator 23 disposed on the same side of the cover plate 21 as the touch display panel 22, the actuator 23 including at least one first actuator 231 and at least one second actuator 232, the first actuator 231 and the second actuator 232 each disposed close to the curved edges QB, the first actuator 231 and the second actuator 232 being located on different sides of a first midline ZW1, the first midline ZW1 being a straight line connecting midpoints of the two curved edges QB, the actuator 23 configured to drive the cover plate 21 to vibrate in response to a driving signal, so as to generate haptic feedback on a surface of the cover plate 21 facing away from the touch display panel 22.

[0071] For example, as shown in FIG. 15, the driving assembly 152 of the haptic feedback module 151 can output a driving signal to the actuator 23 according to a touch position of a touch object on the touch display panel 22, and the actuator 23 drives the cover plate 21 to vibrate in response to the driving signal, so as to generate haptic feedback on a surface of the cover plate 21 facing away from the touch display panel 22. The touch object can be a finger or a stylus, etc. The actuator 23 can also drive the cover plate 21 and the touch display panel 22 to vibrate together.

[0072] As shown in any one of FIGS. 3-8, different actuators 23 are disposed on both sides of the first midline ZW1, i.e., the first actuator 231 is disposed on one side (e.g., the upper side as shown in FIGS. 3-8) of the first midline ZW1, and the second actuator 232 is disposed on the other side (e.g., the lower side as shown in FIGS. 3-8) of the first midline ZW1. Since the first actuator 231 and the second actuator 232 can be independently driven, i.e., the same or different driving signals can be provided to the first actuator 231 and the second actuator 232, the two sides of the first midline ZW1 can be driven in a partitioned manner, which is conducive to improving the uniformity and intensity of haptic feedback of the curved screen.

[0073] In the case of providing different driving signals to the first actuator 231 and the second actuator 232, the driving signal provided to the first actuator 231 and the driving signal provided to the second actuator 232 can have different frequencies, amplitudes, and / or phases.

[0074] Exemplarily, as shown in FIG. 9, the display surface S is used to display the first interaction region JH1, in the process of driving to generate the tactile feedback, the touch position of the touch object on the touch display panel 22 can be acquired first; then it is judged whether the touch position is located in the first interaction region JH1, if the touch position is located in the first interaction region JH1, according to the position of the first interaction region JH1 on the display surface S, the driving signals with the same phase or opposite phase are provided to the first actuator 231 and the second actuator 232.

[0075] Exemplarily, as shown in FIG. 9, the display surface S includes the first display region AA1, the second display region AA2 and the third display region AA3 arranged in sequence along the second direction f2, the second direction f2 is perpendicular to the first direction f1, and the first median line ZW1 is located in the second display region AA2.

[0076] If the first interaction region JH1 is located in the second display region AA2, as shown in FIG. 9, the driving signals with the same phase are provided to the first actuator 231 and the second actuator 232, in this case, the vibration mode as shown in FIG. 10a can be excited, and there is one half wave in the curved edge QB direction. As shown in FIG. 10a, since the second display region AA2 is located at the wave peak / trough position between two wave nodes WN, a stronger vibration sensation can be generated in the second display region AA2, and then a stronger vibration sensation can be generated in the first interaction region JH1.

[0077] If the first interaction region JH1 is located in the first display region AA1 or the third display region AA3, the driving signals with opposite phase are provided to the first actuator 231 and the second actuator 232, in this case, the vibration mode as shown in FIG. 10b can be excited, and there are two half waves in the curved edge QB direction. As shown in FIG. 10b, since the first display region AA1 and the third display region AA3 are located at the wave peak / trough position, a stronger vibration sensation can be generated in the first display region AA1 and the third display region AA3, and then a stronger vibration sensation can be generated in the first interaction region JH1.

[0078] In this way, according to the position of the first interaction region JH1 on the display surface S, the driving signals with the same phase or opposite phase are provided to the first actuator 231 and the second actuator 232, no matter which display region (such as the first display region AA1, the second display region AA2 and the third display region AA3) the first interaction region JH1 is located in, a stronger vibration sensation can be obtained, so that the uniformity and intensity of the tactile feedback of the curved screen can be improved.

[0079] The haptic feedback module provided by the present disclosure can be applied to a vehicle display, mainly a curved surface vehicle display such as a vehicle central control, an armrest screen, a co-driver entertainment screen, etc. It can also be applied to wristband display products such as watches, bracelets, etc. It can also be applied to notebook computers, displays, etc. to provide users with a rich and realistic haptic experience.

[0080] In the present disclosure, the curved edge QB is a circular arc with a certain curvature.

[0081] For example, as shown in any one of FIGS. 3-8, the area of the cover plate 21 is larger than that of the touch display panel 22. The surface curvature of the cover plate 21 close to the touch display panel 22 is substantially the same as that of the display surface S.

[0082] It should be noted that a in FIG. 10 is the vibration mode of a 12.8-inch touch display panel at 109 Hz, and b is the vibration mode of a 12.8-inch touch display panel at 300 Hz. The touch display panel is a flexible organic light-emitting diode (OLED) display panel, and the bending curvature of the cover plate 21 is R800.

[0083] For example, the first actuator 231 and the second actuator 232 can be arranged close to one or both curved edges QB, which is not limited in the present disclosure. In FIGS. 3-8, the first actuator 231 and the second actuator 232 are arranged close to both curved edges QB.

[0084] In the present disclosure, the cover plate 21 serves to encapsulate and protect the touch display panel 22. The cover plate 21 is, for example, transparent glass, etc.

[0085] For example, the touch display panel 22 can include a touch circuit and a display panel. The touch circuit can be integrated inside the display panel or arranged independently of the display panel, for example, between the display panel and the cover plate 21. The touch circuit is used to detect the touch position of a touch object on the touch display panel 22.

[0086] For example, the first actuator 231 and the second actuator 232 are used to generate vibrations at a first frequency. The first frequency can be greater than or equal to 20 Hz and less than or equal to 500 Hz, for example, to achieve a low-frequency vibration feedback effect. The first frequency is, for example, the characteristic frequency of the haptic feedback module.

[0087] For example, the shape of the cover plate 21 can be rectangular (as shown in FIGS. 3, 7 and 8), trapezoidal (as shown in FIGS. 4-6), etc.

[0088] For example, the shape of the display surface S can be rectangular (as shown in FIGS. 3-4, 7 and 8), trapezoidal (as shown in FIGS. 5 and 6), etc.

[0089] Exemplarily, as shown in FIG. 2, the first actuator 231 and the second actuator 232 arranged close to the same curved edge QB can be an integrated structure in communication with each other, and the integrated structure is, for example, a strip-shaped structure extending along the curved edge QB.

[0090] In this case, only the driving signals with the same phase can be provided to the first actuator 231 and the second actuator 232, and thus only the vibration mode shown in FIG. 10a can be excited, in which the second display area AA2 is located at the wave peak / trough position, and the first display area AA1 or the third display area AA3 is located at the wave node WN position, and thus only when the first interaction area JH1 is located at the second display area AA2, a stronger vibration sensation can be generated, and when the first interaction area JH1 is located at the first display area AA1 or the third display area AA3, a weaker vibration sensation can be generated.

[0091] In order to further improve the vibration sensation uniformity, exemplarily, as shown in any one of FIGS. 3 to 8, the first actuator 231 and the second actuator 232 are arranged separately from each other, and the orthographic projections of the first actuator 231 and the second actuator 232 on the display surface S do not overlap with the first median line ZW1.

[0092] By arranging the first actuator 231 and the second actuator 232 separately from each other, the first actuator 231 and the second actuator 232 can be driven independently, so that the same or different driving signals can be provided to the first actuator 231 and the second actuator 232, and thus stronger vibration sensations can be generated in more display areas, and the vibration sensation uniformity can be improved.

[0093] When the driving signals with opposite phases are provided to the first actuator 231 and the second actuator 232, the vibration mode shown in FIG. 10b can be excited, in which the first median line ZW1 is located at the wave node WN position, and the amplitude near the wave node WN is very small, and the vibration sensation is very weak. By arranging the first actuator 231 and the second actuator 232 separately from each other, and arranging the first actuator 231 and the second actuator 232 away from the first median line ZW1, when the vibration mode shown in FIG. 10b is excited, the first actuator 231 and the second actuator 232 can be arranged away from the wave node WN, which is beneficial to increasing the amplitude and the vibration sensation.

[0094] Exemplarily, as shown in any one of FIGS. 3 to 8, the first actuator 231 and the second actuator 232 arranged close to the same curved edge QB are arranged along the extension direction of the curved edge QB.

[0095] Exemplarily, as shown in any one of FIGS. 3-8, the plurality of first actuators 231 are arranged along the extension direction of the curved edge QB, and the plurality of second actuators 232 are arranged along the extension direction of the curved edge QB. By arranging the plurality of first actuators 231 and the plurality of second actuators 232 near the curved edge QB and spaced apart from each other, on the one hand, it is beneficial to enhance the vibration sensation and the vibration sensation uniformity, and on the other hand, it is beneficial to reduce the size of the first actuators 231 and the second actuators 232, so as to reduce the fit gap between the first actuators 231 or the second actuators 232 and the curved cover plate 21, and avoid the first actuators 231 or the second actuators 232 being crushed.

[0096] Exemplarily, as shown in FIG. 3, in the extension direction of the curved edge QB, the distance between two adjacent first actuators 231, the distance between an adjacent first actuator 231 and a second actuator 232, and the distance between two adjacent second actuators 232 are all approximately equal to p1, and p1 is greater than zero. That is, the actuators 23 arranged near the same curved edge QB are arranged at equal intervals along the extension direction of the curved edge QB, which is beneficial to further improve the vibration sensation uniformity.

[0097] Exemplarily, as shown in any one of FIGS. 3-8, the two curved edges QB include a first curved edge QB1 and a second curved edge QB2.

[0098] Exemplarily, as shown in any one of FIGS. 3-8, the first actuators 231 and the second actuators 232 arranged near the same curved edge QB are translationally symmetric along the extension direction of the curved edge QB.

[0099] The translationally symmetric means that the translation of one or more first actuators 231 arranged near the same curved edge QB along the extension direction of the curved edge QB can coincide with one or more second actuators 232.

[0100] As shown in any one of FIGS. 3, 5-8, the two first actuators 231 arranged near the first curved edge QB1 can be translationally symmetric along the extension direction of the first curved edge QB1 with the two second actuators 232 arranged near the first curved edge QB1. The two first actuators 231 arranged near the second curved edge QB2 can be translationally symmetric along the extension direction of the second curved edge QB2 with the two second actuators 232 arranged near the second curved edge QB2.

[0101] Exemplarily, as shown in FIG. 3, the touch display panel 22 is axially symmetric relative to the first median line ZW1, and the cover plate 21 is axially symmetric relative to the first median line ZW1.

[0102] Exemplarily, as shown in FIG. 3, the first actuators 231 and the second actuators 232 arranged near the same curved edge QB are axially symmetric relative to the first median line ZW1.

[0103] Exemplarily, as shown in any one of FIGS. 3-8, the display surface S further comprises two straight edges ZB arranged oppositely along a second direction f2, which are respectively a first straight edge ZB11 and a second straight edge ZB22. The second direction f2 is perpendicular to the first direction f1, for example.

[0104] Exemplarily, as shown in any one of FIGS. 3-8, the touch display panel 22 is axisymmetric relative to a second midline ZW2, and the cover plate 21 is axisymmetric relative to the second midline ZW2. The second midline ZW2 is a straight line connecting the midpoints of the two straight edges ZB.

[0105] Exemplarily, as shown in any one of FIGS. 3-8, the first actuator 231 arranged close to the first curved edge QB1 is axisymmetric relative to the second midline ZW2 with the first actuator 231 arranged close to the second curved edge QB2, and the second actuator 232 arranged close to the first curved edge QB1 is axisymmetric relative to the second midline ZW2 with the second actuator 232 arranged close to the second curved edge QB2.

[0106] In this way, by symmetrically arranging the first actuator 231 on both sides of the second midline ZW2 and symmetrically arranging the second actuator 232 on both sides of the second midline ZW2, the uniformity of touch can be further improved.

[0107] During the driving process, the same driving signal can be provided to the first actuator 231 arranged close to the first curved edge QB1 and the first actuator 231 arranged close to the second curved edge QB2, and the same driving signal can be provided to the second actuator 232 arranged close to the first curved edge QB1 and the second actuator 232 arranged close to the second curved edge QB2.

[0108] Exemplarily, as shown in FIGS. 4-6, the first actuator 231 and the second actuator 232 have a rectangular shape in orthographic projection on the cover plate 21, and the long side of the rectangle is parallel to the extension direction of the curved edge QB (as shown in FIGS. 4 and 6), or the long side of the rectangle is perpendicular to the first direction f1 (as shown in FIG. 5).

[0109] Referring to FIG. 12, a shows a plan view of a touch feedback module, and b shows a cross-sectional view of a cover plate. As shown in FIG. 12, the first actuator 231 and the second actuator 232 stretch and contract along the long side direction of the rectangle (as shown by the vertical arrow in a of FIG. 12), thereby driving the cover plate 21 to vibrate along the normal direction of the cover plate 21 (as shown by the horizontal arrow in b of FIG. 12).

[0110] Exemplarily, as shown in FIG. 3 and FIG. 4, the cover plate 21 includes a first edge BY1 arranged close to the curved edge QB, and a gap between the first edge BY1 and the curved edge QB in the orthographic projection on the cover plate 21 includes a first gap JX1 and a second gap JX2, the first actuator 231 is arranged in the first gap JX1, the second actuator 232 is arranged in the second gap JX2, and the width of the first gap JX1 along the first direction f1 is greater than or equal to the width of the second gap JX2 along the first direction f1.

[0111] As shown in FIG. 3, the cover plate 21 and the touch display panel 22 are both rectangular in shape, the first edge BY1 of the cover plate 21 is parallel to the curved edge QB of the touch display panel 22, and the width of the first gap JX1 along the first direction f1 is equal to the width of the second gap JX2 along the first direction f1.

[0112] As shown in FIG. 4, the cover plate 21 is in the shape of an inverted trapezoid, the touch display panel 22 is in the shape of a rectangle, the first edge BY1 of the cover plate 21 intersects with the extension line of the curved edge QB of the touch display panel 22, and the width of the first gap JX1 along the first direction f1 is greater than the width of the second gap JX2 along the first direction f1.

[0113] Exemplarily, as shown in FIG. 3, among the plurality of actuators 23 arranged close to the same curved edge QB, the plurality of first actuators 231 are arranged in an array along the extension direction of the curved edge QB and form a column, and the plurality of second actuators 232 are arranged in an array along the extension direction of the curved edge QB and form a column.

[0114] As shown in FIG. 3, the width of the first gap JX1 along the first direction f1 is equal to the width of the second gap JX2 along the first direction f1. The plurality of first actuators 231 arranged close to the first curved edge QB1 are arranged in a column along the extension direction of the first curved edge QB1, the plurality of second actuators 232 arranged close to the first curved edge QB1 are arranged in a column along the extension direction of the first curved edge QB1. The plurality of first actuators 231 arranged close to the second curved edge QB2 are arranged in a column along the extension direction of the second curved edge QB2, and the plurality of second actuators 232 arranged close to the second curved edge QB2 are arranged in a column along the extension direction of the second curved edge QB2.

[0115] Exemplarily, as shown in FIG. 4, the plurality of first actuators 231 arranged close to the same curved edge QB are arranged in a matrix, the plurality of first actuators 231 are divided into a plurality of first actuator columns along the first direction f1, the plurality of second actuators 232 arranged close to the same curved edge QB are arranged in a matrix, the plurality of second actuators 232 are divided into at least one second actuator column along the first direction f1, and the number of the first actuator columns arranged close to the same curved edge QB is greater than or equal to the number of the second actuator columns.

[0116] As shown in FIG. 4, the first actuator column includes one or a plurality of first actuators 231 arranged along the extending direction of the curved edge QB, and the second actuator column includes one or a plurality of second actuators 232 arranged along the extending direction of the curved edge QB. In FIG. 4, one first actuator column includes five first actuators 231 arranged along the extending direction of the curved edge QB, and one second actuator column includes five second actuators 232 arranged along the extending direction of the curved edge QB.

[0117] Exemplarily, the number of the first actuator column and the second actuator column arranged close to the same curved edge QB (such as the first curved edge QB1 or the second curved edge QB2) can be the same, for example, both two columns, three columns or more.

[0118] Exemplarily, the number of the first actuator column and the second actuator column arranged close to the same curved edge QB (such as the first curved edge QB1 or the second curved edge QB2) can also be different. In the case that the width of the first gap JX1 along the first direction f1 is greater than the width of the second gap JX2 along the first direction f1, the number of the first actuator column arranged close to the same curved edge QB is greater than the number of the second actuator column, for example, the number of the first actuator column is three, and the number of the second actuator column is one or two, or the number of the first actuator column is four, and the number of the second actuator column is one, two or three, and so on.

[0119] In this way, by arranging a larger number of actuators 23 in a larger gap, it is beneficial to enhance the vibration sensation.

[0120] As shown in FIG. 4, the width of the first gap JX1 along the first direction f1 is greater than the width of the second gap JX2 along the first direction f1. The plurality of first actuators 231 arranged close to the first curved edge QB1 (or the second curved edge QB2) are divided into two first actuator columns, and the plurality of second actuators 232 arranged close to the first curved edge QB1 (or the second curved edge QB2) are divided into one second actuator column, i.e., the number of the first actuator column arranged close to the first curved edge QB1 (or the second curved edge QB2) is greater than the number of the second actuator column.

[0121] Exemplarily, as shown in FIG. 3, the plurality of first actuators 231 arranged close to the first curved edge QB1 are arrayed along the extending direction of the first curved edge QB1, and the plurality of first actuators 231 form one column, and the plurality of second actuators 232 arranged close to the second curved edge QB2 are arrayed along the extending direction of the second curved edge QB2, and the plurality of second actuators 232 form one column. Among them, the first curved edge QB1 is any one of the two curved edges QB, and the second curved edge QB2 is the other one of the two curved edges QB arranged opposite to the first curved edge QB1.

[0122] As shown in FIG. 3, the width of the first gap JX1 along the first direction f1 is equal to the width of the second gap JX2 along the first direction f1. The plurality of first actuators 231 arranged near the first curved edge QB1 are arranged in a column along the extension direction of the first curved edge QB1, and the plurality of second actuators 232 arranged near the second curved edge QB2 are arranged in a column along the extension direction of the second curved edge QB2. The plurality of first actuators 231 arranged near the second curved edge QB2 are arranged in a column along the extension direction of the second curved edge QB2, and the plurality of second actuators 232 arranged near the first curved edge QB1 are arranged in a column along the extension direction of the first curved edge QB1.

[0123] Exemplarily, as shown in FIG. 4, the plurality of first actuators 231 arranged near the same curved edge QB are arranged in a matrix, the plurality of first actuators 231 are divided into a plurality of first actuator columns along the first direction f1, the plurality of second actuators 232 arranged near the same curved edge QB are arranged in a matrix, the plurality of second actuators 232 are divided into at least one second actuator column along the first direction f1, and the number of the first actuator columns arranged near the first curved edge QB1 is greater than or equal to the number of the second actuator columns arranged near the second curved edge QB2. Herein, the first curved edge QB1 is any one of the two curved edges QB, and the second curved edge QB2 is the other curved edge QB arranged opposite to the first curved edge QB1.

[0124] As shown in FIG. 4, the first actuator column includes one or a plurality of first actuators 231 arranged along the extension direction of the curved edge QB, and the second actuator column includes one or a plurality of second actuators 232 arranged along the extension direction of the curved edge QB. In FIG. 4, one first actuator column includes five first actuators 231 arranged along the extension direction of the curved edge QB, and one second actuator column includes five second actuators 232 arranged along the extension direction of the curved edge QB.

[0125] Exemplarily, the number of the first actuator columns and the second actuator columns arranged near different curved edges QB can be the same, for example, two columns, three columns or more.

[0126] Exemplarily, the number of the first actuator columns and the second actuator columns arranged near different curved edges QB can also be different. In the case that the width of the first gap JX1 along the first direction f1 is greater than the width of the second gap JX2 along the first direction f1, the number of the first actuator columns arranged near different curved edges QB is greater than the number of the second actuator columns, for example, the number of the first actuator columns arranged near one curved edge QB is three, the number of the second actuator columns arranged near the other curved edge QB is one or two, or the number of the first actuator columns arranged near one curved edge QB is four, the number of the second actuator columns arranged near the other curved edge QB is one, two or three, and so on.

[0127] In this way, by arranging a larger number of actuators 23 in the larger gap, it is beneficial to enhance the vibration sensation.

[0128] As shown in FIG. 4, the width of the first gap JX1 along the first direction f1 is greater than the width of the second gap JX2 along the first direction f1. The plurality of first actuators 231 arranged close to the first curved edge QB1 are divided into two first actuator columns, and the plurality of second actuators 232 arranged close to the second curved edge QB2 are divided into one second actuator column, i.e., the number of the first actuator columns arranged close to the first curved edge QB1 is greater than the number of the second actuator columns arranged close to the second curved edge QB2.

[0129] As shown in FIG. 4, the plurality of first actuators 231 arranged close to the second curved edge QB2 are divided into two first actuator columns, and the plurality of second actuators 232 arranged close to the first curved edge QB1 are divided into one second actuator column, i.e., the number of the first actuator columns arranged close to the second curved edge QB2 is greater than the number of the second actuator columns arranged close to the first curved edge QB1.

[0130] Exemplarily, as shown in FIG. 3, the minimum distance d1 between the first actuator 231 and the second actuator 232 and the first edge BY1 is greater than or equal to zero.

[0131] Exemplarily, as shown in FIG. 3, the minimum distance d2 between the first actuator 231 and the second actuator 232 and the curved edge QB is greater than zero, which can ensure that there is a gap between the actuator 23 and the touch display panel 22.

[0132] Exemplarily, as shown in any one of FIGS. 4 to 8, the actuator 23 further comprises at least one third actuator 233, and the third actuator 233 is arranged close to the straight edge ZB. The third actuator 233 can be arranged close to one or two straight edges ZB.

[0133] Exemplarily, the third actuator 233 is used to generate a second frequency of vibration, and the first frequency is less than the second frequency, and the second frequency can be greater than or equal to 20 kHz, for example, so as to regulate the friction force of the vibration surface, thereby realizing the texture tactile feedback. The second frequency is, for example, the characteristic frequency of the tactile feedback module.

[0134] By increasing the third actuator 233, the high-low frequency composite tactile feedback effect can be realized, and in combination with the driving signal waveform, the vibration and texture change rich tactile feedback effect can be realized, thereby enhancing the human-computer interaction experience and driving safety.

[0135] Exemplarily, as shown in FIG. 9, the display surface S is also used to display a second interaction region JH2. In the process of driving to generate the tactile feedback, the touch position of the touch object on the touch display panel 22 can be acquired first; then it is judged whether the touch position is located in the second interaction region JH2. If the touch position is located in the second interaction region JH2, the driving signal of the second frequency is provided to the third actuator 233.

[0136] Exemplarily, in the driving process, the driving signals of the same phase or opposite phase can be provided to the third actuators 233 arranged close to the two straight edges ZB.

[0137] Referring to FIG. 11, a high-frequency vibration mode of the tactile feedback module is shown. The mode characteristic of the high-frequency vibration is a standing wave. The number of nodes n of the standing wave shown in FIG. 11 is 22, and the corresponding half wavelength λ of the standing wave is H0 / (n+1), where H0 is the size of the cover plate 21 in the second direction f2 (as shown in FIG. 2). 1 / 2

[0138] It should be noted that a in FIG. 11 is the vibration mode of the 12.8-inch touch display panel 22 at 22 kHz, and b is the vibration mode of the 12.8-inch touch display panel 22 at 24 kHz. The touch display panel 22 is a flexible OLED display panel, and the bending radius of the cover plate 21 is R800. The vibration mode shown in a in FIG. 11 can be formed by providing the driving signals of the same phase to the third actuators 233 arranged close to the two straight edges ZB, and the vibration mode shown in b in FIG. 11 can be formed by providing the driving signals of the opposite phase to the third actuators 233 arranged close to the two straight edges ZB.

[0139] Exemplarily, as shown in FIG. 4, the cover plate 21 includes a second edge BY2 close to the straight edge ZB. In the orthographic projection on the cover plate 21, the third actuator 233 is arranged in the gap between the second edge BY2 and the straight edge ZB, and the distance h2 between the geometric center of the third actuator 233 and the second edge BY2 is m times of the first half wavelength, where m is a positive integer greater than or equal to 1, and the first half wavelength is half of the wavelength of the standing wave formed by the vibration of the cover plate 21 driven by the third actuator 233 (i.e., the half wavelength λ of the standing wave). 1 / 2

[0140] That is, h2=m*λ 1 / 2 , m≥1. In this way, the geometric center of the third actuator 233 can be located at the position of the wave peak / trough of the standing wave, which is beneficial to increasing the vibration intensity.

[0141] ​​Exemplarily, as shown in FIG. 4, in the orthographic projection on the cover plate 21, the distance h3 between the geometric center of the first actuator 231 and the second edge BY2 is n times of the first half wavelength, the distance h4 between the geometric center of the second actuator 232 and the second edge BY2 is k times of the first half wavelength, n and k are both positive integers greater than or equal to 1, and m, n and k are all different. In this way, it can be ensured that the geometric centers of the first actuator 231 and the second actuator 232 are located at the wave peak / trough positions of the standing wave, which is beneficial to increase the vibration intensity.

[0142] That is, h3 = n * λ 1 / 2 , h4 = k * λ 1 / 2 , n ≥ 1, k ≥ 1. In this way, it can be ensured that the geometric centers of the first actuator 231 and the second actuator 232 are located at the wave peak / trough positions of the standing wave, which is beneficial to increase the vibration intensity.

[0143] In order to ensure that the actuator 23 avoids the standing wave node, exemplarily, as shown in FIG. 7, the width of the first actuator 231 along the second direction f2, the width of the second actuator 232 along the second direction f2, and the width of the third actuator 233 along the second direction f2 are all less than or equal to the first half wavelength, which is half of the standing wave wavelength formed by the third actuator 233 driving the cover plate 21 to vibrate (i.e. the standing wave half wavelength λ 1 / 2 ).

[0144] Exemplarily, as shown in FIG. 6 or FIG. 7, the number of the third actuators 233 arranged close to the same straight edge ZB is one, and the third actuator 233 is a strip structure extending along the straight edge ZB.

[0145] Exemplarily, as shown in FIG. 6 or FIG. 7, in the extension direction of the straight edge ZB, the width of the third actuator 233 is less than or equal to the width of the cover plate 21 at the corresponding position, so as to ensure that the orthographic projection of the third actuator 233 on the cover plate 21 is within the range of the cover plate 21.

[0146] Exemplarily, as shown in FIG. 4, FIG. 5 or FIG. 8, the number of the third actuators 233 arranged close to the same straight edge ZB is multiple, and the multiple third actuators 233 arranged close to the same straight edge ZB are arranged along the extension direction of the straight edge ZB. By arranging multiple third actuators 233 separated from each other near the straight edge ZB, it is beneficial to enhance the uniformity of the touch feeling.

[0147] Exemplarily, as shown in FIG. 8, the distance d3 between two third actuators 233 arranged adjacent in the extension direction of the straight edge ZB is greater than zero and less than or equal to half of the width of the third actuator 233 in the extension direction of the straight edge ZB.

[0148] It should be noted that the smaller the distance between two third actuators 233 arranged adjacently, the more delicate the tactile sensation effect can be generated. The distance d3 between two third actuators 233 arranged adjacently in the extension direction of the straight edge ZB is for example less than or equal to 2 mm.

[0149] Exemplarily, as shown in any one of FIGS. 4 to 8, the orthographic projection shape of the third actuator 233 on the cover plate 21 is a rectangle, and the long side of the rectangle is parallel to the extension direction of the straight edge ZB. The extension direction of the straight edge ZB is for example the first direction f1.

[0150] As shown in FIG. 12, the third actuator 233 extends and contracts along the long side direction of the rectangle (as shown by the horizontal arrow in FIG. 12a), thereby driving the cover plate 21 to vibrate along the normal direction of the cover plate 21 (as shown by the horizontal arrow in FIG. 12b).

[0151] As shown in any one of FIGS. 4 to 8, the two straight edges ZB include a first straight edge ZB1 and a second straight edge ZB2.

[0152] Exemplarily, as shown in FIGS. 4, 7 or 8, the first straight edge ZB1 and the second straight edge ZB2 are axially symmetrical relative to the first median line ZW1, the width of the first straight edge ZB1 along the first direction f1 is equal to the width of the second straight edge ZB2 along the first direction f1, and the third actuator 233 arranged close to the first straight edge ZB1 is axially symmetrical relative to the first median line ZW1 with the third actuator 233 arranged close to the second straight edge ZB2. In this way, by symmetrically arranging the third actuators 233 on both sides of the first median line ZW1, the uniformity of the tactile sensation can be further improved.

[0153] In FIG. 7, the number of third actuators 233 arranged close to the first straight edge ZB1 is one, the number of third actuators 233 arranged close to the second straight edge ZB2 is one, and the width of the third actuator 233 arranged close to the first straight edge ZB1 along the first direction f1 is the same as the width of the third actuator 233 arranged close to the second straight edge ZB2 along the first direction f1.

[0154] In FIGS. 4 and 8, the number of third actuators 233 arranged close to the first straight edge ZB1 is multiple, the number of third actuators 233 arranged close to the second straight edge ZB2 is multiple, and the number of third actuators 233 arranged close to the first straight edge ZB1 is the same as the number of third actuators 233 arranged close to the second straight edge ZB2.

[0155] Exemplarily, as shown in FIG. 5, the width of the first straight edge ZB1 along the first direction f1 is greater than the width of the second straight edge ZB2 along the first direction f1, the number of third actuators 233 arranged close to the first straight edge ZB1 is multiple, the number of third actuators 233 arranged close to the second straight edge ZB2 is multiple, and the number of third actuators 233 arranged close to the first straight edge ZB1 is greater than the number of third actuators 233 arranged close to the second straight edge ZB2.

[0156] Exemplarily, as shown in FIG. 6, the width of the first straight side ZB1 along the first direction f1 is greater than the width of the second straight side ZB2 along the first direction f1, the number of the third actuators 233 close to the first straight side ZB1 is one, the number of the third actuators 233 close to the second straight side ZB2 is one, and the width of the third actuator 233 arranged close to the first straight side ZB1 along the first direction f1 is greater than the width of the third actuator 233 arranged close to the second straight side ZB2 along the first direction f1.

[0157] Exemplarily, the curvature of the curved side QB is greater than or equal to R100, which is beneficial to exciting a low-frequency characteristic mode to realize the vibration haptic feedback. For example, the curvature of the curved side QB is R800.

[0158] It should be noted that the curvature of the curved side QB being R100 means that the curved side QB is an end circular arc with a bending radius of 100 mm. The curvature of the curved side QB being R800 means that the curved side QB is an end circular arc with a bending radius of 800 mm.

[0159] Exemplarily, the central angle corresponding to the curved side QB is greater than or equal to 90°, which is beneficial to exciting a low-frequency characteristic mode to realize the vibration haptic feedback.

[0160] Exemplarily, the thickness of the cover plate 21 is greater than or equal to 0.5 mm and less than or equal to 2 mm, which is beneficial to exciting a low-frequency characteristic mode to realize the vibration haptic feedback. For example, the thickness of the cover plate 21 is 1 mm.

[0161] Exemplarily, as shown in FIG. 2, the ratio of the width H0 of the cover plate 21 perpendicular to the first direction f1 to the width W0 of the cover plate 21 along the first direction f1 is greater than or equal to 2 / 3 and less than or equal to 1, i.e., 2:3≤H0:W0≤1:1.

[0162] Exemplarily, as shown in FIG. 2 or FIG. 3, the two curved sides QB are parallel to each other.

[0163] Exemplarily, as shown in FIG. 4 to FIG. 6, the extension lines of the two curved sides QB intersect, and the intersection angle is greater than 0° and less than 90°.

[0164] Exemplarily, as shown in any one of FIG. 3 to FIG. 8, the actuator 23 is located on the side of the cover plate 21 close to the touch display panel 22, and in the orthographic projection on the cover plate 21, the actuator 23 is located between the edge of the touch display panel 22 and the edge of the cover plate 21.

[0165] That is, the actuator 23 is arranged on the back of the cover plate 21 in the same layer as the touch display panel 22, which has less influence on the thickness of the haptic feedback module, and thus is beneficial to the thinning of the haptic feedback module.

[0166] In some embodiments, the actuator 23 comprises at least one of a PZT piezoelectric film, a monolithic piezoelectric ceramic, a stacked piezoelectric ceramic, a cymbal piezoelectric ceramic, a monolithic polyvinylidene fluoride film, a stacked polyvinylidene fluoride film, a cymbal polyvinylidene fluoride film, a linear motor, and the like.

[0167] Exemplarily, the actuator 23 is a piezoelectric sheet, which can be a bulk piezoelectric sheet attached to the cover plate 21 or a piezoelectric film grown on the cover plate 21. The piezoelectric sheet can be a flexible piezoelectric sheet or a rigid piezoelectric sheet.

[0168] Exemplarily, the actuator 23 can have a triangular, rectangular, square, polygonal, strip-shaped, circular, elliptical, cymbal, or the like shape in the orthographic projection on the cover plate 21.

[0169] Compared with the monolithic structure, the stacked structure and the cymbal structure of the actuator 23 have the characteristics of low-voltage driving, stronger vibration, and larger displacement, and are more suitable for realizing the haptic feedback effect on a large-size and heavy-mass haptic feedback module.

[0170] The present disclosure also provides a haptic feedback device, which, as shown in FIG. 15, comprises the haptic feedback module 121 provided in any of the embodiments, and a driving assembly 152 connected with the touch display panel 22 and the actuator 23, respectively, for outputting a driving signal to the actuator 23 according to the touch position of the touch object on the touch display panel 22, so that the actuator 23 drives the cover plate 21 to vibrate in response to the driving signal, thereby generating a haptic feedback on the surface of the cover plate 21 away from the touch display panel 22.

[0171] Those skilled in the art can understand that the haptic feedback device provided by the present disclosure has the advantages of the haptic feedback module described above.

[0172] The haptic feedback device provided by the present disclosure can be applied to vehicle display, mainly for curved surface vehicle display; can also be applied to flexible wristband products such as watches, bracelets, and the like; and can also be applied to notebook computers, displays, and the like, to provide users with rich and realistic haptic experience.

[0173] As shown in FIG. 15, the driving assembly 152 can also be used to drive the touch display panel 22 to display an interactive picture on the display surface S. When the touch object performs a touch operation on the touch display panel 22, the touch position can be detected by the touch display panel 22, and the driving assembly 152 generates a driving signal according to the detected touch position, which is used to drive the actuator 23 to drive the cover plate 21 to vibrate, thereby generating a haptic feedback effect on the surface of the cover plate 21 away from the touch display panel 22. According to the haptic feedback, the operator can confirm whether his operation is correct and whether he can achieve the desired effect.

[0174] Exemplarily, the driving assembly 152 can be a car machine system or a PC host computer, etc.

[0175] Exemplarily, the touch display panel 22 can include a touch circuit and a display panel. The touch circuit can be integrated inside the display panel, or can be arranged independently of the display panel, for example, the touch circuit is attached between the display panel and the cover plate 21.

[0176] In some embodiments, the touch circuit can be a capacitive touch circuit or a resistive touch circuit, which is not limited in the present disclosure.

[0177] For the capacitive touch circuit, when a touch object such as a user's finger touches the touch display panel 22, the touch capacitance of the touch driving electrode and the touch sensing electrode in the touch circuit at the touch position changes, and the touch wires in the touch circuit can send the touch capacitance at each position to the driving assembly 152, which can determine the touch position according to the touch capacitance at each position.

[0178] In some embodiments, the driving assembly 152 can include a controller and a driver. Exemplarily, when a touch object applies a touch operation to the touch display panel 22, the controller responds to the touch operation and outputs a driving signal in the form of a digital signal to the driver according to the touch position detected by the touch display panel 22, and the driver generates an analog signal form driving signal after digital-to-analog conversion of the digital signal form driving signal and sends it to the actuator 23, which vibrates under the driving of the driving signal, thereby driving the touch display panel 22 to vibrate and form a tactile feedback.

[0179] Exemplarily, the controller can include at least one of a microcontroller unit (MCU) and an FPGA (Field Programmable Gata Array), etc., which is not limited in the present embodiment.

[0180] Exemplarily, when the tactile feedback device is applied in a terminal, the driving assembly 152 can be a processor in the terminal.

[0181] In some embodiments, as shown in FIG. 15, the tactile feedback device can further include an amplification circuit 153 connected with the driving assembly 152 and the actuator 23 respectively, for amplifying the driving signal output by the driving assembly 152 and sending the amplified signal to the actuator 23.

[0182] In some embodiments, the display panel can be a liquid crystal display panel or a self-luminous display panel. The self-luminous display panel is internally provided with a light-emitting device, which can be an organic light-emitting diode (OLED), a quantum dot light-emitting diode (QLED), a mini light-emitting diode (Mini LED), a micro light-emitting diode (Micro LED), or the like.

[0183] The present disclosure provides a driving method of a haptic feedback module, which is applied to the haptic feedback module provided in any of the embodiments. As shown in FIG. 9, the display surface S of the touch display panel 22 is used to display a first interaction region JH1, and the driving method comprises the following steps:

[0184] Step S01: obtaining a touch position of a touch object on the touch display panel 22.

[0185] Step S02: if the touch position is located in the first interaction region JH1, providing driving signals with the same or opposite phases to the first actuator 231 and the second actuator 232 according to the position of the first interaction region JH1 on the display surface S.

[0186] Exemplarily, the first interaction region JH1 comprises virtual keys such as buttons, knobs, and sliding bars.

[0187] Exemplarily, the driving signals provided to the first actuator 231 and the second actuator 232 have a first frequency.

[0188] Exemplarily, as shown in FIG. 9, the display surface S comprises a first display region AA1, a second display region AA2, and a third display region AA3 arranged in sequence along a second direction f2, the second direction f2 is perpendicular to the first direction f1, and the first median line ZW1 is located in the second display region AA2. Step S02 can specifically comprise the following steps:

[0189] Step S11: if the first interaction region JH1 is located in the second display region AA2, providing driving signals with the same phase to the first actuator 231 and the second actuator 232.

[0190] Exemplarily, the driving signals provided to the first actuator 231 and the second actuator 232 are f0=U0sin(2πf l t). Wherein, the first frequency f l =150Hz, U0=180V, and the duration of the driving signal f0is, for example, ten periods, i.e. 10*1 / fl The waveform of the driving signal f0 is shown in Fig. 13.

[0191] Step S12: If the first interaction area JH1 is located in the first display area AA1 or the third display area AA3, the first actuator 231 and the second actuator 232 are provided with driving signals with opposite phases.

[0192] For example, the driving signal provided to the first actuator 231 is f1 = U0sin(2πf0t), and the driving signal provided to the second actuator 232 is f2 = U0sin(2πf0t+π), where the first frequency f0 = 300 Hz, U0 = 180 V, and the duration of the driving signals f1 and f2 is, for example, ten periods, i.e. 10*1 / f0. l l l l The waveform of the driving signals f1 and f2 is shown in Fig. 13.

[0193] For example, as shown in any one of Figs. 4 to 8, the display surface S further comprises two straight edges ZB oppositely arranged along the second direction f2, and the actuator 23 further comprises a third actuator 233 arranged close to the straight edges ZB, as shown in Fig. 9, the display surface S is further used to display a second interaction area JH2, and after step S01, the method can further comprise:

[0194] Step S21: If the touch position is located in the second interaction area JH2, the third actuator 233 is provided with a driving signal of a second frequency, and the second frequency is greater than the first frequency. The third actuator is used to realize high-frequency textured friction vibration, and the second frequency is generally greater than or equal to 20 kHz, and the first frequency is generally in the range of 20 Hz to 500 Hz.

[0195] For example, the driving signals provided to the third actuator 233 arranged close to the two straight edges ZB have the same phase or opposite phases.

[0196] For example, the driving signal provided to the third actuator 233 comprises a carrier signal f(t), and the carrier signal f(t) is a sine wave with a wave function f(t) = U1sin(2πf1t), where f1 is the frequency of the carrier signal, i.e. the second frequency, and U1 is the amplitude of the carrier signal. z z z h h

[0197] For example, the driving signal provided to the third actuator 233 can further comprise a modulation signal g(t), and the modulation signal g(t) is a Sine function, and the corresponding waveform function is:

[0198] ​​​​​​​​wherein f is the frequency of the modulation signal, and n is the number of zero-crossings of the modulation signal in one period. The number of zero-crossings is the number of real numbers t that satisfy g(t) = 0. t wherein f is the frequency of the modulation signal, and n is the number of zero-crossings of the modulation signal in one period. The number of zero-crossings is the number of real numbers t that satisfy g(t) = 0.

[0199] For example, the frequency f of the modulation signal g(t) is greater than or equal to 10 Hz and less than or equal to 40 Hz. t For example, the frequency f of the modulation signal g(t) is greater than or equal to 10 Hz and less than or equal to 40 Hz.

[0200] For example, as shown in FIG. 14, the driving signal h(t) provided to the third actuator 233 is a carrier signal f1(t) modulated by a modulation signal g(t). The corresponding waveform function is h(t) = f1(t) * g(t). The modulation signal g(t) is mainly used to adjust the amplitude of the carrier signal f1(t), thereby adjusting the friction coefficient between the finger and the touch substrate 10. z For example, the frequency f of the modulation signal g(t) is greater than or equal to 10 Hz and less than or equal to 40 Hz.

[0201] For example, as shown in FIG. 14, the driving signal h(t) provided to the third actuator 233 is a carrier signal f1(t) modulated by a modulation signal g(t). The corresponding waveform function is h(t) = f1(t) * g(t). The modulation signal g(t) is mainly used to adjust the amplitude of the carrier signal f1(t), thereby adjusting the friction coefficient between the finger and the touch substrate 10. t For example, the frequency f of the modulation signal g(t) is greater than or equal to 10 Hz and less than or equal to 40 Hz.

[0202] In the present disclosure, the meaning of "a plurality of" is two or more, and the meaning of "at least one" is one or more, unless otherwise explicitly and specifically limited.

[0203] In the present disclosure, the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0204] In the present disclosure, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, product or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, product or device including the element.

[0205] As used herein, the terms “one embodiment,” “some embodiments,” “certain embodiments,” “one or more embodiments,” “some implementations,” “one implementation,” “some examples,” “one example,” and the like are generally used to describe different features, structures, materials, or characteristics included in certain examples of the disclosure. The terminology used herein is for the purpose of describing selected embodiments only and is not intended to be limiting of other embodiments. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and / or “comprising,” or “includes” and / or “including” when used herein, specify the presence of stated features, structures, materials, and / or characteristics, but do not preclude the presence or addition of one or more other features, structures, materials, and / or characteristics herein. Furthermore, examples of the present disclosure are illustrated by the accompanying drawings and described by the claims. It will be understood that these examples are merely representative of the many possible embodiments of the present disclosure. Numerous and various embodiments of the present disclosure can be derived from the examples that are described and illustrated, which are meant to be exemplary and not limiting. Other embodiments can be developed and carried out by a skilled artisan from consideration of the disclosure herein, with the general principles described herein explaining how such additional embodiments could be implemented.

[0206] As used herein, the terms “first,” “second,” “third,” etc. are typically used to identify various components in an example embodiment with the understanding that the components so identified can be different from other components and still perform a similar or identical function. Unless otherwise specified, the use of these terms in the description and / or claims to describe structures or features of one embodiment will not exclude similar structures or features in other embodiments.

[0207] In describing some embodiments, expressions such as “coupled” and “connected” can be used. For example, the term “connected” can be used to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term “coupled” can be used to indicate that two or more elements are in either direct physical or electrical contact with each other or that two or more elements are not in direct contact with each other, but yet are still in cooperation or interaction with each other. The embodiments disclosed herein are not necessarily limited in terms of the manner in which the various elements are coupled or connected together.

[0208] “at least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and includes the following combinations: only A, only B, only C, A and B, A and C, B and C, and A and B and C.

[0209] “A and / or B” includes the following combinations: A alone, B alone, and A and B together.

[0210] As used herein, the term “if’ is optionally interpreted as meaning “when” or “upon” or “in response to a determination” or “in response to a detection” depending on the context. Similarly, the phrase “if determined” or “if detected” is optionally interpreted as meaning “upon a determination” or “in response to a determination” or “upon a detection” or “in response to a detection” depending on the context.

[0211] The use of “for” or “configured to” herein means open and inclusive language that does not exclude additional devices or steps not specifically recited.

[0212] The use of "based on" or "according to" herein means open and inclusive. A process, step, calculation, or other action that is based on one or more recited conditions or values may, in practice, be based on other conditions or values beyond those recited. A process, step, calculation, or other action that is according to one or more recited conditions or values may, in practice, be according to other conditions or values beyond those recited.

[0213] As used herein, "about," "approximately," or "around" includes the recited value and the average value within an acceptable range of deviation from the recited value, as determined by one of ordinary skill in the art taking into account the measurement in question and the error associated with measuring the particular quantity (i.e., the limitations of the measurement system).

[0214] As used herein, "parallel," "perpendicular," "equal," "flush" includes the recited condition and conditions that approximate the recited condition, the approximation being within an acceptable range of deviation, as determined by one of ordinary skill in the art taking into account the measurement in question and the error associated with measuring the particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and near parallel, where near parallel can be within an acceptable range of deviation of, for example, 5°; "perpendicular" includes absolute perpendicular and near perpendicular, where near perpendicular can also be within an acceptable range of deviation of, for example, 5°. "Equal" includes absolute equality and near equality, where near equality can be within an acceptable range of deviation of, for example, less than or equal to 5% of either of the two quantities being compared. "Flush" includes absolute flush and near flush, where near flush can be within an acceptable range of deviation of, for example, less than or equal to 5% of either of the two dimensions being compared.

[0215] It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate or intervening layers can also be present.

[0216] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are idealized examples. In the interest of clarity, not all of the layer and regions are shown in the drawings with the same dimensions. For example, the thickness of layers and regions can be exaggerated in the drawings. Thus, the exemplary embodiments are not intended to be limited to the illustrations as shown in the drawings, but include variations as would be known to one of ordinary skill in the art. For example, the etched regions shown as rectangular can typically have curved features. Thus, the regions illustrated in the drawings are schematic and not intended to be exact representations of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0217] It should be finally pointed out that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A haptic feedback module, comprising: a cover plate; a touch display panel disposed on a side of the cover plate, a display surface of the touch display panel being disposed proximate to the cover plate, the display surface comprising two curved edges disposed opposite to each other along a first direction, a projection of the touch display panel on the cover plate being within a range of the cover plate; and an actuator disposed on the same side of the cover plate as the touch display panel, the actuator comprising at least one first actuator and at least one second actuator, the first actuator and the second actuator each being disposed proximate to the curved edge, the first actuator and the second actuator being located on different sides of a first midline, the first midline being a straight line connecting midpoints of the two curved edges, the actuator being configured to vibrate the cover plate in response to a driving signal to generate a haptic feedback on a surface of the cover plate facing away from the touch display panel.

2. The haptic feedback module of claim 1, wherein, The first actuator and the second actuator disposed proximate to the same curved edge are an integrated structure in communication with each other, the integrated structure being a strip-shaped structure extending along the curved edge.

3. The haptic feedback module of claim 1, wherein, The first actuator and the second actuator are disposed separately from each other, and projections of the first actuator and the second actuator on the display surface do not overlap the first midline.

4. The haptic feedback module of claim 3, wherein, A plurality of the first actuators and a plurality of the second actuators are arranged along an extension direction of the curved edge; and In the extension direction of the curved edge, distances between adjacent two first actuators, distances between adjacent first actuator and second actuator, and distances between adjacent two second actuators are substantially equal and greater than zero.

5. The haptic feedback module of claim 1, wherein, The first actuator and the second actuator disposed proximate to the same curved edge are translationally symmetrical along the extension direction of the curved edge.

6. The haptic feedback module of claim 1, wherein, The display surface further comprises two straight edges disposed opposite to each other along a second direction, the two curved edges comprising a first curved edge and a second curved edge, the first actuator disposed proximate to the first curved edge and the first actuator disposed proximate to the second curved edge being axially symmetrical about a second midline, the second midline being a straight line connecting midpoints of the two straight edges, the second actuator disposed proximate to the first curved edge and the second actuator disposed proximate to the second curved edge being axially symmetrical about the second midline.

7. The haptic feedback module of claim 1, wherein, The cover plate comprises a first edge disposed proximate to the curved edge, in a projection of the cover plate, a gap between the first edge and the curved edge comprises a first gap and a second gap, the first actuator is disposed in the first gap, the second actuator is disposed in the second gap, a width of the first gap along the first direction is greater than or equal to a width of the second gap along the first direction.

8. The haptic feedback module of claim 7, wherein, Among a plurality of actuators disposed proximate to the same curved edge, a plurality of first actuators are arrayed along an extension direction of the curved edge, and the plurality of first actuators form a column, a plurality of second actuators are arrayed along the extension direction of the curved edge, and the plurality of second actuators form a column.

9. The haptic feedback module of claim 7, wherein, A plurality of first actuators disposed proximate to the same curved edge are matrixed, the plurality of first actuators being divided into a plurality of first actuator columns along the first direction; The plurality of second actuators arranged in a matrix near the same curved edge are divided into at least one second actuator column along the first direction; And The number of the first actuator columns arranged near the same curved edge is greater than or equal to the number of the second actuator columns.

10. The haptic feedback module of claim 7, wherein, The two curved edges include a first curved edge and a second curved edge, the plurality of first actuators arranged near the first curved edge are arranged in an array along the extension direction of the first curved edge and form a column, and the plurality of second actuators arranged near the second curved edge are arranged in an array along the extension direction of the second curved edge and form a column.

11. The haptic feedback module of claim 7, wherein, The plurality of first actuators arranged in a matrix near the same curved edge are divided into a plurality of first actuator columns along the first direction; The plurality of second actuators arranged in a matrix near the same curved edge are divided into at least one second actuator column along the first direction; and The two curved edges include a first curved edge and a second curved edge, and the number of the first actuator columns arranged near the first curved edge is greater than or equal to the number of the second actuator columns arranged near the second curved edge.

12. The haptic feedback module of any of claims 1 to 11, wherein, The display surface further includes two straight edges arranged opposite along a second direction, and the actuator further includes at least one third actuator arranged near the straight edge; and The first actuator and the second actuator are used to generate vibrations of a first frequency, and the third actuator is used to generate vibrations of a second frequency, the first frequency being less than the second frequency.

13. The haptic feedback module of claim 12, wherein, The cover plate includes a second edge near the straight edge, and in the orthographic projection on the cover plate, the third actuator is arranged in a gap between the second edge and the straight edge; and The distance between the geometric center of the third actuator and the second edge is m times of a first half wavelength, the distance between the geometric center of the first actuator and the second edge is n times of the first half wavelength, and the distance between the geometric center of the second actuator and the second edge is k times of the first half wavelength, the m, the n and the k are positive integers greater than or equal to 1, and the m, the n and the k are different from each other, and the first half wavelength is half of the wavelength of a standing wave formed when the cover plate vibrates driven by the third actuator.

14. The haptic feedback module of claim 12, wherein, The number of the third actuators arranged near the same straight edge is one, and the third actuator is a strip structure extending along the straight edge.

15. The haptic feedback module of claim 12, wherein, The number of the third actuators arranged near the same straight edge is a plurality, and the plurality of third actuators arranged near the same straight edge are arranged along the extension direction of the straight edge.

16. The haptic feedback module of claim 15, wherein, The distance between two third actuators arranged adjacent in the extension direction of the straight edge is greater than zero and less than or equal to half of the width of the third actuator in the extension direction of the straight edge.

17. The haptic feedback module of claim 12, wherein, The width of the first actuator along the second direction, the width of the second actuator along the second direction, and the width of the third actuator along the second direction are each less than or equal to a first half wavelength, the first half wavelength being half of a standing wave wavelength formed by the third actuator driving the cover plate to vibrate.

18. The haptic feedback module of any of claims 1 to 11, wherein, The curvature of the curved side is greater than or equal to R100; and / or The central angle of the curved side corresponding to a circle is greater than or equal to 90°; and / or The thickness of the cover plate is greater than or equal to 0.5 mm and less than or equal to 2 mm.

19. The haptic feedback module of any of claims 1 to 11, wherein, The ratio of the width of the cover plate perpendicular to the first direction to the width of the cover plate along the first direction is greater than or equal to 2 / 3 and less than or equal to 1.

20. The haptic feedback module of any of claims 1 to 11, wherein, The two curved sides are parallel to each other, or the extensions of the two curved sides intersect, and the intersection angle is greater than 0° and less than 90°.

21. The haptic feedback module of any of claims 1 to 11, wherein, The actuator includes at least one of the following: a PZT piezoelectric film, a monolithic piezoelectric ceramic, a stacked piezoelectric ceramic, a cymbal piezoelectric ceramic, a monolithic polyvinylidene fluoride film, a stacked polyvinylidene fluoride film, a cymbal polyvinylidene fluoride film, and a linear motor.

22. A haptic feedback device, comprising: The haptic feedback module according to any one of claims 1 to 21; And A driving assembly connected with the touch display panel and the actuator respectively, configured to output a driving signal to the actuator according to the touch position of the touch object on the touch display panel, so that the actuator drives the cover plate to vibrate in response to the driving signal, to generate haptic feedback on the surface of the cover plate away from the touch display panel.

23. A driving method of a haptic feedback module, applied to the haptic feedback module according to any one of claims 1 to 21, the display surface of the touch display panel being configured to display a first interaction area, the driving method comprising: Obtaining a touch position of a touch object on the touch display panel; If the touch position is located in the first interaction area, providing the first actuator and the second actuator with driving signals of the same phase or opposite phase according to the position of the first interaction area on the display surface.

24. The driving method according to claim 23, wherein The display surface comprises a first display area, a second display area and a third display area arranged in sequence along a second direction, the second direction being perpendicular to the first direction, the first median line being located in the second display area, and the step of providing the first actuator and the second actuator with driving signals of the same phase or opposite phase according to the position of the first interaction area on the display surface, comprising: If the first interaction area is located in the second display area, providing the first actuator and the second actuator with driving signals of the same phase; If the first interaction area is located in the first display area or the third display area, providing the first actuator and the second actuator with driving signals of opposite phase.

25. The driving method according to claim 23 or 24, wherein The display surface further comprises two straight edges arranged opposite along the second direction, the actuator further comprises a third actuator arranged close to the straight edges, the display surface is further used to display a second interaction area, the driving signal provided to the first actuator and the second actuator has a first frequency, after the step of obtaining the touch position of the touch object on the touch display panel, the method further comprises: if the touch position is located in the second interaction area, a driving signal with a second frequency is provided to the third actuator, the second frequency is greater than the first frequency, and the driving signals provided to the third actuator arranged close to the two straight edges have the same phase or opposite phases.

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