Actuator having a compliant member and panel audio speaker including the actuator

Abstract

A panel audio speaker includes a panel extending in a plane. The speaker also includes an actuator coupled to one side of the panel and configured to couple vibrations to the panel so that the panel emits audio waves. The actuator includes a rigid frame attached to the surface of the panel, the rigid frame including a portion extending perpendicular to the panel surface and a plate extending parallel to the panel. The actuator also includes a magnet assembly and a magnetic coil forming a magnetic circuit. The actuator also includes at least one flexible member that connects the magnetic circuit to the portion of the rigid frame extending perpendicular to the panel surface. The actuator also includes a compliance member positioned between the magnetic circuit and the panel, the compliance member being configured to improve the response of the speaker compared to an actuator without the compliance member.

Description

Background Art

[0001] The present description relates to actuators including one or more compliant members, and to panel audio speakers having actuators.

[0002] Many conventional speakers produce sound by inducing piston-like motion in a diaphragm. In contrast, panel audio speakers operate by inducing a distributed vibration pattern in the panel through an electroacoustic actuator. Typically, the actuator is an electromagnetic actuator or a piezoelectric actuator. Summary of the invention

[0003] A panel audio speaker featuring an actuator attached to an acoustic radiator (e.g., a display panel) is disclosed. The speaker includes a compliant member that can improve the high frequency performance of the system. The shape of the compliant member and the relative positioning of the compliant member to other components of the mass-spring system can be changed to accommodate the size constraints of the actuator. In addition, the material properties of the compliant member can be changed to affect the resonant frequency of the corresponding actuator.

[0004] A first aspect of the present invention provides a panel audio speaker, comprising a panel extending in a plane and an actuator coupled to one side of the panel. The actuator is configured to couple vibrations to the panel so that the panel emits audio waves. The actuator comprises a rigid frame attached to the surface of the panel, the rigid frame comprising a portion extending perpendicular to the panel surface and a plate extending parallel to the panel. The actuator also comprises a magnet assembly and a magnetic coil forming a magnetic circuit. The actuator also comprises at least one flexible member, the at least one flexible member connecting the magnetic circuit to the portion of the rigid frame extending perpendicular to the panel surface. The actuator also comprises a compliance member positioned between the magnetic circuit and the panel. One or more properties of the compliance member can be selected to tune the frequency response of the panel speaker (in other words, to achieve a desired frequency response). For example, any one or more of the following characteristics can be selected to tune the frequency response: (multiple) constituent materials of the compliance member; the shape of the compliance member; the dimensions of the compliance member; the position of the compliance member relative to the magnetic circuit, the panel and the plate; the hardness of the compliance member; and / or the Young's modulus of the compliance member. It should be understood that these are non-limiting examples of properties of the compliance member that may be selected. The properties of the compliance member may be selected to improve (e.g., increase) the high frequency response of the panel speaker, such as by improving (e.g., increasing) the frequency response for at least some frequencies in the range of 5 kHz to 20 kHz. For example, the properties of the compliance member may be selected to provide a resonance peak at one or more frequencies in the range, to adjust (e.g., increase or decrease) the amplitude of the resonance peak, and / or to adjust the width of the resonance peak.

[0005] In general, on the other hand, the present invention features a panel audio speaker that includes a panel extending in a plane. The panel audio speaker also includes an actuator that is coupled to one side of the panel and is configured to couple vibrations to the panel so that the panel emits audio waves. The actuator includes a rigid frame attached to the surface of the panel, the rigid frame including a portion extending perpendicular to the panel surface and a plate extending parallel to the panel. The actuator also includes a magnet assembly and a magnetic coil that form a magnetic circuit. The actuator also includes at least one flexible member that connects the magnetic circuit to the portion of the rigid frame that extends perpendicular to the panel surface. The actuator also includes a compliance member positioned between the magnetic circuit and the panel, the compliance member being configured to improve the response of the panel audio speaker to at least some frequencies from 5kHz to 20kHz compared to an actuator without the compliance member.

[0006] Embodiments of the panel audio speaker may include one or more of the following features and / or one or more of the features of other aspects. For example, a compliant member may be positioned between the magnetic circuit and the panel. A compliant member may be positioned between the magnetic coil and the panel, the compliant member mechanically coupling the magnetic coil to the panel.

[0007] In other embodiments, the compliant member is positioned between the panel and the plate.The compliant member may be substantially coextensive with the panel.

[0008] In still other embodiments, the response of the panel audio speaker is at least 5 dB higher for at least some frequencies from 7.5 kHz to 20 kHz compared to an actuator without a compliant member.

[0009] In some embodiments, the compliant member comprises foam, while in other embodiments, the compliant member comprises an elastomer. In other embodiments, the compliant member comprises a pressure sensitive adhesive. In other embodiments, the compliant member comprises a material having a Shore A hardness in the range of 20 to 90.

[0010] In some embodiments, the magnetic coil is rigidly attached to the plate.

[0011] In other embodiments, the panel includes a display panel.

[0012] On the other hand, the present invention has a mobile device or wearable device, which includes an electronic display panel extending in a plane. The mobile device or wearable device also includes a rack attached to the electronic display panel and defining a first space between the rear panel of the rack and the electronic display panel. The mobile device or wearable device also includes an electronic control module accommodated in the first space. The electronic control module also includes a processor. The mobile device or wearable device also includes a back plate facing the electronic display panel, and the electronic display panel and the back plate define a second space therebetween. The mobile device or wearable device also includes an actuator accommodated in the second space and attached to the surface of the electronic display panel, and the actuator and the electronic display panel form a panel audio speaker. The actuator includes a rigid frame attached to the surface of the electronic display panel, the rigid frame including a portion extending perpendicular to the surface of the electronic display panel and a plate extending parallel to the electronic display panel. The actuator includes a magnet assembly and a magnetic coil forming a magnetic circuit. The actuator also includes at least one flexible member that connects the magnetic circuit to the portion of the rigid frame extending perpendicular to the surface of the electronic display panel. The actuator also includes a compliance member positioned between the magnetic circuit and the electronic display panel, the compliance member being configured to improve the response of the panel audio speaker for at least some frequencies from 5 kHz to 20 kHz compared to an actuator without the compliance member. An electronic control module is in electrical communication with the actuator and is programmed to activate the actuator during operation of the mobile device or wearable device to cause the electronic display panel to vibrate. Optionally, the mobile device or wearable device may include any or all of the previously mentioned features of an embodiment of the panel audio speaker.

[0013] In some embodiments, the mobile device is a mobile phone or a tablet computer. In some embodiments, the wearable device is a smart watch or a head mounted display.

[0014] Among other advantages, embodiments can provide a panel audio speaker having enhanced output (e.g., 5 dB or more) at certain frequencies (e.g., high audio frequencies) compared to a similar panel audio speaker that does not include a compliant member. Additionally, including a compliant member in the system can improve the performance of the panel audio speaker without significantly affecting the size of the actuator, manufacturing constraints, or material costs.

[0015] Other advantages will be apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of an embodiment of a mobile device.

[0017] Figure 2 yes Figure 1 Schematic cross-sectional view of a mobile device.

[0018] Figure 3 is a schematic cross-sectional view showing a portion of a mobile device of an actuator including a compliant member attached between a substrate and a magnetic coil of the actuator.

[0019] Figure 4A is a side view of a portion of a mobile device showing an actuator including a compliant member attached between a base plate of the actuator and a panel of the mobile device.

[0020] Figure 4B yes Figure 4A Schematic cross-sectional view of a mobile device and an actuator.

[0021] Figure 5 It is shown that Figure 3 , 4A 4B and a cross-sectional view of a mobile device having an actuator of a substrate, the actuator being attached to a panel including a compliant member.

[0022] Figure 6 is a graph showing sound pressure level versus frequency for a panel audio speaker with a controlled actuator and a panel audio speaker with a modified actuator.

[0023] Figure 7 is a graph showing the magnitude of the blocking force provided by an actuator as a function of the frequency of the actuator, the actuator including compliant members each having a different Young's modulus.

[0024] Figure 8 is a schematic diagram of an embodiment of an electronic control module for a mobile device.

[0025] Like reference numbers in the various drawings represent like elements. DETAILED DESCRIPTION

[0026] The present disclosure features an actuator for a panel audio speaker such as a distributed mode speaker (DML). Such a speaker can be integrated into a mobile device such as a mobile phone. For example, referring to Figure 1 , the mobile device 100 includes a device housing 102 and a touch panel display 104 or simply a panel 104, which includes a flat panel display (e.g., an OLED or LCD display panel) with integrated panel audio speakers. The mobile device 100 interfaces with the user in various ways, including by displaying images and receiving touch input via the panel 104. Typically, the mobile device has a depth (in the z direction) of about 10 mm or less, a width (in the x direction) of 60 mm to 80 mm (e.g., 68 mm to 72 mm), and a height (in the y direction) of 100 mm to 160 mm (e.g., 138 mm to 144 mm).

[0027] The mobile device 100 also generates an audio output. The audio output is generated using a panel audio speaker that generates sound by vibrating a flat panel display. The display panel is coupled to an actuator, such as a distributed actuator or DMA. The actuator is a movable component that is arranged to provide force to a panel such as panel 104 so that the panel vibrates. The vibrating panel generates sound waves that can be heard by humans, for example in the range of 20Hz to 20kHz. Typically, the efficiency of the actuator in generating audible sound waves varies as a function of frequency depending on the characteristics of the actuator, the panel, and the coupling of the actuator to the panel. Typically, the actuator / panel system will exhibit one or more resonant frequencies, which represent frequencies with local maxima at the sound pressure level as a function of frequency. However, it is generally desirable that the panel audio speaker maintain a relatively high sound pressure level over the entire audio spectrum.

[0028] In addition to generating sound output, the mobile device 100 can also generate tactile output using the actuator. For example, the tactile output can correspond to vibrations in the range of 180 Hz to 300 Hz.

[0029] Figure 1 It also shows that the corresponding Figure 2 The cross-sectional directions are shown in dashed lines. Figure 2 , a cross-section 200 of the mobile device 100 shows the equipment rack 102 and the panel 104. For ease of reference, Figure 2 Also included is a Cartesian coordinate system having x, y and z axes. The equipment rack 102 has a depth measured along the z direction and a width measured along the x direction. The equipment rack 102 also has a back plate formed by a portion of the equipment rack 102 that extends primarily in the xy plane. The mobile device 100 includes an actuator 210 that is housed in a space defined by the panel 104 and the back plate of the rack 102. More specifically, the actuator 210 is positioned in the rack 102 behind the panel 104 and is fixed to the back side of the panel. Typically, the size of the actuator 210 is designed to fit within a volume limited by other components housed in the chassis 102, including an electronic control module 220 and a battery 230.

[0030] The coupling between at least a portion of the actuator and the panel, and therefore the frequency response of the system, can be tuned by including compliant materials at appropriate locations in the system. Figure 3, the electromagnetic actuator 310 includes a compliant member 324 positioned between a magnetic coil 314 and a substrate 326 attached (e.g., bonded) to the back of the panel 104. The actuator 310 also includes a frame 312, which includes two side walls extending primarily in the z direction perpendicular to the substrate 326 and a pair of flexible members 316a and 316b that support the magnet assembly above the magnetic coil 314. The magnet assembly includes a magnetic cup 318 surrounding a spacer 320 and a pole magnet 322 attached to the spacer. The pole magnet 322 can be circular in the xy plane and generate a radial magnetic field perpendicular to the z axis. The magnetic cup 318, the spacer 320, and the pole magnet 322 are shaped so that there is an air gap between the wall of the magnetic cup and the pole magnet. The air gap accommodates the magnetic coil 314 and provides space for relative movement between the coil and the magnetic cup 318.

[0031] During operation of the actuator, the electronic control module 220 energizes the magnetic coil 314, causing an electric current to pass through the coil. The electric current induces a magnetic field that is perpendicular to the magnetic field of the pole magnet 322. Due to the placement of the coil 314 in the magnetic field, the coil 314 is subjected to a force exerted by the magnetic field of the magnet assembly. Due to the induced magnetic field, the magnet assembly is displaced in the z-direction. Alternating the direction of the electric current causes the magnet assembly to vibrate back and forth in the z-direction, thereby exerting a force on the panel 104, which also vibrates in the z-direction, thereby generating acoustic waves.

[0032] The compliant member 324 is a spring element (e.g., a helical spring, a leaf spring, or a conical spring) coupling the magnetic coil 314 to the substrate 326, which has a stiffness selected to tune the frequency response of the panel audio speaker formed by the actuator and the panel. More generally, the compliant member 324 can be formed by any material or combination of materials having mechanical properties sufficient to modify the frequency response of the panel audio speaker (relative to rigidly coupling the magnetic coil to the substrate) to produce an enhanced response within a specific frequency range (e.g., at high frequencies) without significantly degrading the response at other frequencies. Typically, the compliant member 324 can be formed by metal, plastic, foam, elastomer, or pressure-sensitive adhesive. In some embodiments, the compliant member can be formed by a material having a Shore A hardness in the range of 20 to 90 (e.g., 25 or greater, 30 or greater, 35 or greater, 40 or greater, 45 or greater, such as 85 or less, 80 or less, 75 or less, 70 or less, 65 or less). In addition, the compliant member should be sufficiently flexible so that it will not deform or fatigue due to its interaction with other components of the actuator. Generally, the size and shape of the compliant member 324 can vary. Generally, it may be desirable to keep the compliant member as small as possible to avoid increasing the size of the actuator. In some embodiments, the compliant member can be shaped to have the same footprint (i.e., shape in the xy plane) as the magnetic coil (e.g., circular). In some cases, the compliant member can extend beyond the magnetic coil. For example, the compliant member can extend together with the substrate. In other embodiments, the compliant member can extend along the dimension of the panel 104.

[0033] Typically, the size, shape, and material properties of the compliant member are selected based on the desired frequency response of the system. For example, in some embodiments, the compliant member is selected to provide an increased frequency response at high frequencies without significantly reducing the response at lower frequencies. For example, for at least some frequencies above 7 kHz (e.g., from about 7 kHz to about 15 kHz), the compliant member can produce an increase in sound pressure level of 4 dB or greater (e.g., 5 dB or greater, 6 dB or greater) relative to a comparable system without the compliant member.

[0034] Although Figure 3 An actuator 310 is shown including a compliant member 324 positioned between a magnetic coil 314 and a substrate 326, but other arrangements are possible. For example, in some embodiments, the compliant member may be positioned between the substrate of the actuator and a panel of a mobile device. Figure 4A and 4B An example of such a system is shown. Specifically, Figure 4A and 4BAn actuator 410 is shown having a substrate 326 bonded to a compliant member 424, which in turn is bonded to the panel 104. The compliant member 424 is coextensive with the substrate 326 and functions to modify the coupling of vibrations from the actuator 410 to the panel 104. Figure 4B Also included is a coil former or bobbin 428, which is a housing for the coil 314. Thus, although Figure 4A Coil 314 is shown, but regarding Figure 4B , the coil is hidden by the coil frame 428 and cannot be seen. Figure 4A An embodiment is shown in which compliant member 424 is coextensive with base plate 326, however in some embodiments, the compliant member extends only a portion of the dimension of the base plate.

[0035] Other arrangements are possible. For example, although the compliant member 424 is coextensive with the base plate 326, Figure 5 An actuator 510 is shown attached to a panel 504 via a compliant member 524 that is coextensive with the panel 504. For example, the compliant member is applied (e.g., laminated) to the back of the panel, such as by a panel supplier and a common actuator that is subsequently applied to the panel. This may be advantageous when the actuators are sourced from multiple different suppliers and / or when an actuator design without an integrated compliant member is used. Another advantage provided by a panel with an integrated compliant member is that the combination of the panel, compliant member, and actuator can occupy less space (e.g., as measured in the z-direction) when compared to a mobile device that includes a panel without an integrated compliant member.

[0036] Turning now to an example of the effect of a compliant member on the frequency response of a panel audio speaker, Figure 6 A graph 600 showing sound pressure level measured in dB versus frequency measured in Hz for two panel audio speakers. A first curve 601 corresponds to the frequency response of a panel audio speaker featuring a control actuator that does not include a compliance member. A second curve 602 corresponds to the frequency response of a panel audio speaker featuring a modified actuator that includes a compliance member positioned between the coil and the panel, as described with respect to FIG. Figure 4A and 4B Curve 600 illustrates certain frequencies at which the modified actuator provides a greater output than the control actuator. Specifically, for frequencies from about 7.5 kHz to just below 20 kHz, the panel audio speaker featuring the modified actuator outputs a sound pressure level that is approximately 6 dB greater than the panel audio speaker featuring the control actuator.

[0037] As described above, the material properties of the compliant member facilitate power transfer from the actuator to the panel 104. For example, Figure 7 A graph 700 showing the relationship between the blocking force amplitude measured in N / V provided by the actuator and the actuator frequency measured in Hz. The blocking force amplitude is the maximum force generated by the actuator for a specific drive voltage. The graph 700 shows four curves, each corresponding to an actuator including a compliant member with different Young's modulus. Curves 701 to 704 correspond to actuators with compliant members having Young's modulus of 0.8MPa, 6MPa, 10MPa and 14MPa, respectively. The compliant member of the actuator is an annular elastic material. Curve 700 shows the peak frequency of each actuator at about 175Hz.

[0038] The peak frequency corresponds to the first resonant frequency of the actuator. The local peak at a higher frequency corresponds to the second resonant frequency of the actuator. Curve 700 shows that changing the Young's modulus of the compliant member causes each actuator to exhibit a different second resonant frequency. In addition, curve 700 shows that as the Young's modulus of the compliant member increases, the frequency of the second resonance of the corresponding actuator also increases.

[0039] Typically, the disclosed actuator is controlled by an electronic control module (e.g., Figure 2 Typically, the electronic control module is composed of one or more electronic components that receive input from one or more sensors and / or signal receivers of the mobile phone, process the input, and generate and transmit a signal waveform that causes the actuator 210 to provide an appropriate tactile response. Figure 8 , an exemplary electronic control module 800 of a mobile device, such as the mobile device 100, includes a processor 810, a memory 820, a display driver 830, a signal generator 840, an input / output (I / O) module 850, and a network / communication module 860. These components are in electrical communication with each other (e.g., via a signal bus 802) and with the actuator 210.

[0040] Processor 810 may be implemented as any electronic device capable of processing, receiving or transmitting data or instructions. For example, processor 810 may be a microprocessor, a central processing unit (CPU), an application specific integrated circuit (ASIC), a digital signal processor (DSP), or a combination of these devices.

[0041] The memory 820 has various instructions, computer programs, or other data stored thereon. The instructions or computer programs may be configured to perform one or more of the operations or functions described with respect to the mobile device. For example, the instructions may be configured to control or coordinate the operation of the display of the device via the display driver 830, the signal generator 840, one or more components of the I / O module 850, one or more communication channels accessible via the network / communication module 860, one or more sensors (e.g., biometric sensors, temperature sensors, accelerometers, optical sensors, air pressure sensors, humidity sensors, etc.), and / or the actuator 210.

[0042] The signal generator 840 is configured to generate an AC waveform having a varying amplitude, frequency, and / or pulse profile suitable for the actuator 210 and produce an acoustic and / or tactile response via the actuator. Although depicted as a separate component, in some embodiments, the signal generator 840 may be part of the processor 810. In some embodiments, the signal generator 840 may include an amplifier, for example, as an integral part thereof or as a separate component.

[0043] The memory 820 can store electronic data that can be used by the mobile device. For example, the memory 820 can store electronic data or content, such as audio and video files, documents and applications, device settings and user preferences, timing and control signals, or data, data structures or databases for various modules, etc. The memory 820 can also store instructions for reconstructing various types of waveforms that can be used by the signal generator 840 to generate signals for the actuator 210. The memory 820 can be any type of memory, such as random access memory, read-only memory, flash memory, removable memory, or other types of storage elements, or a combination of these devices.

[0044] As briefly discussed above, the electronic control module 800 may include Figure 8 850. Figure 8 Although shown as a single item in FIG, a mobile device may include several different input components, including buttons, microphones, switches, and dials for accepting user input. In some embodiments, components of I / O module 850 may include one or more touch sensors and / or force sensors. For example, a display of a mobile device may include one or more touch sensors and / or one or more force sensors that enable a user to provide input to the mobile device.

[0045] Each component of I / O module 850 may include dedicated circuitry for generating signals or data.In some cases, a component may generate or provide feedback for application-specific input corresponding to a prompt or user interface object presented on a display.

[0046] As described above, the network / communication module 860 includes one or more communication channels. These communication channels may include one or more wireless interfaces, which provide communication between the processor 810 and the external device or other electronic device. Typically, the communication channel can be configured to transmit and receive data and / or signals that can be interpreted by the instructions executed on the processor 810. In some cases, the external device is a part of an external communication network configured to exchange data with other devices. Typically, the wireless interface may include, but is not limited to, radio frequency, light, sound and / or magnetic signals, and may be configured to operate via a wireless interface or protocol. Example wireless interfaces include radio frequency cellular interfaces, optical fiber interfaces, acoustic interfaces, Bluetooth interfaces, near field communication interfaces, infrared interfaces, USB interfaces, Wi-Fi interfaces, TCP / IP interfaces, network communication interfaces, or any conventional communication interfaces.

[0047] In some embodiments, one or more of the communication channels of the network / communication module 860 may include a wireless communication channel between the mobile device and another device, such as another mobile phone, a tablet computer, a computer, etc. In some cases, the output, audio output, tactile output, or visual display element may be directly transmitted to another device for output. For example, an audible alarm or visual warning may be transmitted from the mobile device 100 to the mobile phone for output on the device, and vice versa. Similarly, the network / communication module 860 may be configured to receive input provided on another device to control the mobile device. For example, an audible alarm, a visual notification, or a tactile alarm (or its instructions) may be transmitted from an external device to the mobile device for presentation.

[0048] The actuator technology disclosed herein can be used in a panel audio system, for example, designed to provide acoustic and / or tactile feedback. The panel can be a display system, for example, an OLED based on LCD technology. The panel can be part of a smart phone, a tablet computer, or a wearable device (e.g., a smart watch or a head-mounted device, such as smart glasses).

[0049] Other embodiments are within the following claims.

Claims

1. A panel audio speaker, comprising: a panel extending in a plane and having a panel surface; an actuator coupled to the panel and configured to couple vibrations to the panel to cause the panel to emit audio waves, the actuator comprising: a rigid frame attached to the panel surface, the rigid frame comprising a portion extending perpendicular to the panel surface and a plate extending parallel to the panel; A magnet assembly and a magnetic coil, wherein the magnet assembly and the magnetic coil form a magnetic circuit; at least one flexible member connecting the magnetic circuit to the portion of the rigid frame extending perpendicular to the panel surface; and a compliant member extending parallel to the panel and having a first surface in contact with the plate, the compliant member being positioned between the magnetic circuit and the panel, the compliant member being configured to increase the output of the panel audio speaker for at least some frequencies from 5 kHz to 20 kHz compared to the actuator without the compliant member.

2. The panel audio speaker according to claim 1, wherein: The compliant member is positioned between the magnetic circuit and the plate.

3. The panel audio speaker according to claim 2, wherein: The compliant member is positioned between the magnetic coil and the plate, the compliant member mechanically coupling the magnetic coil to the plate.

4. The panel audio speaker according to claim 1, wherein: The compliant member is positioned between the face plate and the board.

5. The panel audio speaker according to claim 4, wherein: The compliant member is substantially coextensive with the panel.

6. The panel audio speaker according to claim 1, wherein: The output of the panel audio speaker is at least 5 dB higher for at least some frequencies from 7.5 kHz to 20 kHz compared to the actuator without the compliant member.

7. The panel audio speaker according to claim 1, wherein: The compliant member includes foam.

8. The panel audio speaker of claim 1, wherein: The compliant member includes an elastomer.

9. The panel audio speaker of claim 1, wherein: The compliant member includes a pressure sensitive adhesive.

10. The panel audio speaker of claim 1, wherein: The compliant member includes a material having a Shore A hardness ranging from 20 to 90.

11. The panel audio speaker of claim 1, wherein: The magnetic coil is rigidly attached to the plate.

12. The panel audio speaker according to any one of claims 1 to 11, wherein: The panel includes a display panel.

13. The panel audio speaker according to any one of claims 1 to 11, wherein: The compliant member is coextensive with the magnetic coil in the plate.

14. A panel audio speaker according to any one of claims 1 to 11, wherein: The compliant member is coextensive with the plate in the plane.

15. The panel audio speaker according to any one of claims 1 to 11, wherein: The compliant member has a second surface opposite the first surface, wherein the second surface contacts the panel surface.

16. A mobile device, comprising: an electronic display panel extending in a plane and having an electronic display panel surface; a frame attached to the electronic display panel and defining a first space between a back panel of the frame and the electronic display panel; an electronic control module accommodated in the first space, the electronic control module comprising a processor; a back plate, the back plate facing the electronic display panel, the electronic display panel and the back plate defining a second space therebetween; as well as an actuator housed in the second space and attached to the electronic display panel surface, the actuator and the electronic display panel forming a panel audio speaker, wherein the actuator comprises: a rigid frame attached to the electronic display panel surface, the rigid frame comprising a portion extending perpendicular to the electronic display panel surface and a plate extending parallel to the electronic display panel; A magnet assembly and a magnetic coil, wherein the magnet assembly and the magnetic coil form a magnetic circuit; at least one flexible member connecting the magnetic circuit to the portion of the rigid frame extending perpendicular to the surface of the electronic display panel; and a compliant member extending parallel to the panel and having a surface in contact with the plate, the compliant member being positioned between the magnetic circuit and the electronic display panel, the compliant member being configured to increase the output of the panel audio speaker for at least some frequencies from 5 kHz to 20 kHz compared to the actuator without the compliant member, Wherein the electronic control module is in electrical communication with the actuator and is programmed to activate the actuator to cause the electronic display panel to vibrate during operation of the mobile device.

17. The mobile device according to claim 16, wherein: The mobile device is a mobile phone or a tablet computer.

18. A wearable device comprising: an electronic display panel extending in a plane and having an electronic display panel surface; a frame attached to the electronic display panel and defining a first space between a back panel of the frame and the electronic display panel; an electronic control module accommodated in the first space, the electronic control module comprising a processor; a back plate, the back plate facing the electronic display panel, the electronic display panel and the back plate defining a second space therebetween; as well as an actuator housed in the second space and attached to the electronic display panel surface, the actuator and the electronic display panel forming a panel audio speaker, wherein the actuator comprises: a rigid frame attached to the electronic display panel surface, the rigid frame comprising a portion extending perpendicular to the electronic display panel surface and a plate extending parallel to the electronic display panel; A magnet assembly and a magnetic coil, wherein the magnet assembly and the magnetic coil form a magnetic circuit; at least one flexible member connecting the magnetic circuit to the portion of the rigid frame extending perpendicular to the surface of the electronic display panel; and a compliant member extending parallel to the panel and having a surface in contact with the plate, the compliant member being positioned between the magnetic circuit and the electronic display panel, the compliant member being configured to increase the output of the panel audio speaker for at least some frequencies from 5 kHz to 20 kHz compared to the actuator without the compliant member, Wherein, the electronic control module is in electrical communication with the actuator and is programmed to activate the actuator to cause the electronic display panel to vibrate during operation of the wearable device.

19. The wearable device according to claim 18, wherein: The wearable device is a smart watch or a head mounted display.

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