Display device

Abstract

The present disclosure relates to a display device including a piezoelectric film type actuator, the display device having a structure in which a recess is provided in a rear surface of a metal layer for supporting and packaging a rear surface of a display panel, and the piezoelectric film type actuator is provided in the recess. Accordingly, the display device can reduce the total thickness and improve the heat dissipation performance.

Description

Technical Field

[0001] This document discloses a display device for providing images, and more specifically, a display device for providing sound along with images without the need for a separate speaker. Background Technology

[0002] The display device may include a display panel for providing images. The display panel may include a liquid crystal display panel, an organic light-emitting diode display panel, a quantum dot display panel, a micro LED display panel, etc.

[0003] Such a display device may include speakers for providing sound and a display panel. The speakers may be installed within the display device or installed separately as a soundbar. When speakers are installed within the display device, they are typically mounted on each side surface of the display panel.

[0004] When speakers are installed in a display device, the direction of sound propagation through the speakers may not be towards the viewer. For example, sound produced by the speakers may propagate along the sides of the display panel or along the top and bottom of the display panel. Therefore, sound quality may be degraded due to interference from sound reflected from walls or the floor.

[0005] Furthermore, when loudspeakers are installed in a suite of equipment such as a TV, the loudspeakers may occupy a certain amount of space, which may limit the design and spatial arrangement of the suite. Summary of the Invention

[0006] Technical issues

[0007] Therefore, the purpose of this disclosure is to solve the above and other problems. Embodiments of this disclosure provide a display device using a piezoelectric film actuator configured to output sound in the forward direction of the display panel.

[0008] In particular, embodiments of this disclosure can provide a display device using a piezoelectric film actuator that can suppress an increase in the overall thickness of the device.

[0009] Another object of this disclosure is to provide a display device that can increase the area of ​​a piezoelectric film actuator.

[0010] Another object of this disclosure is to provide a display device that may have a set of driving units embedded therein to drive a display panel and a piezoelectric film actuator.

[0011] Technical solution

[0012] Embodiments of this disclosure provide a display device including a metal layer, a display panel, a piezoelectric film actuator, and a housing. The metal layer supports and encapsulates the display panel and dissipates heat generated within the display device. At least one recess may be disposed in the rear surface of the metal layer. The display panel may be disposed on the front surface of the metal layer. The piezoelectric film actuator may be disposed in the recess of the metal layer and configured to vibrate the display panel. The housing may cover the rear surface of the piezoelectric film actuator.

[0013] Because the piezoelectric film actuator is located in a groove formed in the metal layer, the overall thickness of the display device can be reduced.

[0014] To improve heat dissipation performance, a heat sink can be placed on the front surface of the piezoelectric film actuator. The thermal conductivity of the heat sink can be higher than that of the metal layer. The heat sink can be a carbon-based heat sink, such as a graphite plate.

[0015] The heat-generating element can be located on one side of the display panel or metal layer, and the recess can be positioned closer to the side opposite to where the heat-generating element is located. Therefore, the performance degradation of organic components in the display, such as organic light-emitting devices, due to heat can be reduced or prevented.

[0016] The actuator for driving the piezoelectric film actuator can be located in an area on the rear surface of the metal layer other than the area where the groove is formed. In this case, an additional cover can be provided to cover the rear surface of the metal layer to protect the exterior of the display.

[0017] A display according to another embodiment of this disclosure may include a metal layer, a display panel, a piezoelectric film actuator, and a housing. The metal layer may support and encapsulate the display panel and dissipate heat generated in the display device. At least one recess may be disposed in the rear surface of the metal layer. The display panel may be disposed on the front surface of the metal layer. The piezoelectric film actuator may be disposed in the recess of the metal layer. The housing may even cover the sides and rear surface of the piezoelectric film actuator.

[0018] When the recess is larger than the piezoelectric actuator in the display device, the housing can fill the gap. Therefore, the vibration area can be increased and heat dissipation performance can be improved.

[0019] In another implementation, embodiments of this disclosure may also provide a display device including a metal layer, a display panel, a driver, a piezoelectric film actuator, and a housing. A recess may be disposed in the rear surface of the metal layer. The driver may be disposed in the recess, and the piezoelectric film actuator may be disposed on at least one side of the driver in the recess of the metal layer. The housing may cover the rear surface of the driver and the rear surface of the piezoelectric film actuator.

[0020] The display device according to this embodiment can increase the vibration area. Furthermore, since the housing can cover the driver and connecting wires, the external appearance of the back of the display device can be improved.

[0021] Detailed descriptions of other implementations and methods may be included in the detailed description and accompanying drawings.

[0022] Beneficial effects

[0023] A piezoelectric film actuator can be disposed in a groove provided in the metal layer. Therefore, this disclosure has the beneficial effect of reducing the overall thickness of the display device.

[0024] Furthermore, even though the size of the piezoelectric film actuator is relatively small, the vibration area can be increased, and the heat dissipation performance can also be improved.

[0025] Furthermore, the housing can cover the drivers and connecting cables. Therefore, the exterior of the display device can be improved.

[0026] The display device according to this disclosure, which has the aforementioned advantages, can be applied to televisions, monitors, laptop computers, smartphones, tablet computers, electronic notebooks, electronic tablets, wearable devices, watch phones, portable information devices, navigation devices, display devices for vehicles, etc.

[0027] The beneficial effects of the display device are not limited to those described above. Those skilled in the art can understand and anticipate other effects not mentioned above from the following detailed description of the embodiments. Attached Figure Description

[0028] Figure 1 The rear surface of a display device according to one embodiment is shown schematically;

[0029] Figure 2 It is shown schematically. Figure 1 The cross-sectional view of the display device shown;

[0030] Figure 3 An example of the arrangement of the housing and heat sink of a piezoelectric diaphragm actuator is shown;

[0031] Figure 4 This is a schematic cross-sectional view of a display device according to another embodiment;

[0032] Figure 5 The rear surface of a display device according to yet another embodiment is schematically shown;

[0033] Figure 6 This is a schematic cross-sectional view of a display device according to another embodiment;

[0034] Figure 7 schematically shown Figure 6 The rear surface of the display device shown; and

[0035] Figure 8 An example of a piezoelectric film actuator that can be used in a display device of this disclosure is illustrated schematically. Detailed Implementation

[0036] The foregoing aspects, features and advantages are described in detail below with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can readily implement the technical spirit of this disclosure.

[0037] This disclosure is not intended to limit the embodiments and drawings described herein, and many other modifications and embodiments can be devised. Identical or equivalent parts may have the same reference numerals, and their descriptions will not be repeated, regardless of the reference numerals. For the sake of brevity with reference to the drawings, the dimensions and outlines of the elements shown in the drawings may be enlarged or reduced, and it should be understood that the embodiments presented herein are not limited to the drawings.

[0038] In the following text, the phrase "a component is disposed or arranged in the upper or lower part" can mean that a component is disposed or arranged to contact the upper or lower surface. This disclosure is not intended to limit the placement of other elements between components or on or below a component. It should be understood that when an element is referred to as being "connected" to another element, the element may be directly connected to the other element, or there may be intermediate elements. Conversely, when an element is referred to as being "directly connected" to another element, there are no intermediate elements.

[0039] In the following text, the expression "a component is positioned or arranged in the upper or lower part" can mean that a component is positioned or arranged to contact the upper or lower surface. This disclosure is not intended to limit the placement of other elements between components or on or below a component. Spatially relative terms can be understood to include terms for different orientations of the device during use or operation, in addition to those shown in the figures. For example, when an element shown in the figures is flipped, an element described as "below" can be placed "above" another element. Thus, the exemplary term "below" can include both below and above orientations.

[0040] It should be understood that although the terminology used in this disclosure may be used herein to describe various embodiments, the embodiments should not be limited by these terms. Singular expressions may include plural expressions unless they indicate a meaning distinct from the context. Terms such as “comprising” or “having” are used herein and should be understood to mean the presence of several components, functions, or steps disclosed in the specification, and it should also be understood that more or fewer components, functions, or steps may be utilized.

[0041] A detailed description will now be given with reference to the accompanying drawings and the exemplary embodiments disclosed herein. For the sake of brevity with reference to the drawings, identical or equivalent parts may have the same reference numerals and their descriptions will not be repeated.

[0042] Figure 1 The rear surface of a display device according to one embodiment is shown schematically. Figure 2 It is shown schematically. Figure 1 The diagram shows a cross-sectional view of the display device.

[0043] refer to Figure 1 and Figure 2 The display device may include a display panel 110, a metal layer 120, a piezoelectric film actuator 130, and a housing 140.

[0044] Display panel 110 can be configured to provide an image, and display panel 110 can be an organic light-emitting diode display panel. However, display panel 110 according to this disclosure is not limited, and it can be one of the known display panels, such as liquid crystal display panels, quantum dot display panels, micro LED display panels, etc.

[0045] The display panel 110 can be disposed on the front surface of the metal layer 120. (Reference) Figure 1 One side of the display panel 110 may be exposed on the rear surface. Various pads, such as source pads, may be provided on the exposed rear surface of the display panel 110. For example, source pads may be electrically connected to a source PCB 112 provided on one side of the rear surface of the metal layer 120.

[0046] The display panel 110 and the metal layer 120 can be attached to each other via an adhesive layer 115. In this disclosure, the adhesive layer 115 ( Figure 5 310) can refer to a layer including pressure-sensitive adhesives or adhesives having temporary or semi-permanent adhesive properties.

[0047] To improve the encapsulation performance of the adhesive layer 115, the adhesive layer 115 may further include a getter material with moisture-absorbing properties, such as CaO and BaO. More preferably, when the display panel 110 is an organic light-emitting diode (OLED) display panel, a getter material is provided in the adhesive layer 115. Here, this technical feature can be applied to other display panels instead of OLED display panels, wherein the getter material is disposed in the adhesive layer 115.

[0048] The metal layer 120 can support the rear surface of the display panel 110 and serve as an encapsulation to prevent moisture from entering the display panel 110. In addition, the metal layer 120 can also serve as a heat sink to dissipate heat generated in the display device.

[0049] To perform the above functions, the metal layer 120 may include aluminum, copper, iron, etc. According to this disclosure, the metal layer 120 may refer to a layer comprising a metal. The metal layer may be a single metal or an alloy, or in the form of a metal-carbon composite.

[0050] According to this disclosure, at least one groove 125 may be provided in the rear surface of the metal layer 120. The groove 125 may have a complete groove wall, for example... Figure 2 One example is shown. As another example, the groove 125 can be a stepped portion that is laterally opened by removing a specific area of ​​the groove wall.

[0051] A piezoelectric film actuator 130 can be disposed in the recess 125. When the piezoelectric film actuator 130 is disposed in the recess 125, an increase in the thickness of the display device due to the addition of the piezoelectric film actuator 130 can be prevented. Furthermore, even without a separate speaker, the display device according to this disclosure can output sound in the front direction of the display panel because the piezoelectric film actuator for outputting sound is arranged in a recess disposed in the rear surface of a metal layer attached to the rear surface of the display panel.

[0052] The housing 140 may cover the rear surface of the piezoelectric film actuator 130. The housing 140 may seal the recess 125 in which the piezoelectric film actuator 130 is disposed. This housing 140 may be formed of a material including metal. For example, the housing 140 may be made of the same material as the metal layer 120.

[0053] The housing 140 can be configured to absorb sound generated on the rear surface of the piezoelectric diaphragm actuator 130, thereby preventing interference with the sound generated from the piezoelectric diaphragm actuator 130. The sound generated by each piezoelectric diaphragm actuator 130 is not affected by the housing 140. Therefore, sound output characteristics can be improved.

[0054] The rear surface of the housing 140 and the rear surface of the metal layer 120 can form the same plane, or the rear surface of the housing 140 can protrude slightly from the rear surface of the metal layer 120, or vice versa.

[0055] The display device according to this disclosure may further include a driver 150. The driver 150 may include a power supply and a controller, and is configured to drive the display panel 110 and the piezoelectric film actuator 130. Figure 1 and Figure 2 Only an example of the electrical connection between the driver 150 and the piezoelectric diaphragm actuator 130 is shown. Figure 1 and Figure 2 The electrical connection between the driver 150 and the display panel 110 is omitted, and any known connection method can be applied to the electrical connection between them.

[0056] like Figure 1 and Figure 2 As shown, the driver 150 can be disposed in areas of the metal layer 120 other than the area where the recess 125 is disposed on the rear surface of the metal layer 120. When the driver 150 and connecting lines 131, etc., are disposed on the rear surface of the metal layer 120, the driver 150 and connecting lines 131, etc., can be exposed on the rear surface of the metal layer 120, making the rear appearance of the display device potentially untidy and unclean. In this case, the exposed areas of the driver 150 and connecting lines 131, as well as the display panel 110 ( Figure 1 The lower area can be covered by an additional cover (not shown).

[0057] refer to Figure 1 and Figure 2 The driver 150 and the piezoelectric diaphragm actuator 130 can be electrically connected to each other via a connecting wire 131. Additionally, the piezoelectric diaphragm actuator 130 may include terminal portions 132a and 132b for contacting or securing the connecting wire 131.

[0058] The connecting wire 131 can be connected to the piezoelectric diaphragm actuator 130 disposed in the recess 125 in various ways. For example, the connecting wire 131 can pass through the housing 140, such as... Figure 2 The example shown bypasses along the side surface of the housing, or is located in the front surface of the housing, such as... Figure 3 As shown.

[0059] When the piezoelectric film actuator 130 vibrates in a predetermined vibration mode via the driver 150, this vibration can be transmitted to the display panel through the thin metal layer portion forming the groove, and sound can be output. In the case of providing multiple piezoelectric film actuators 130, the driver 150 can drive the piezoelectric film actuators 130 simultaneously. As another example, the driver can drive the piezoelectric film actuator 130 individually.

[0060] In order to transmit vibrations to the display panel 110, the metal layer portion forming the groove 125 needs to be as thin as possible. For example, the thickness of the metal layer portion having the groove 125 can be approximately 0.5 mm or less.

[0061] At the same time, heat dissipation and packaging performance can be considered when determining the thickness of areas other than the area forming the recess 125. When further structures such as a bottom cover are provided in the display device, the thickness of the metal layer can be reduced.

[0062] Please refer to later Figure 8 Examples of structures that can be used in a piezoelectric film type actuator in a display device according to this disclosure are described.

[0063] Reference Figure 2A heat sink 160 may be disposed on the front surface of the piezoelectric film actuator 130. The region in the metal layer 120 where the groove 125 is formed may be thinner than other regions. Furthermore, the piezoelectric film actuator 130, which has relatively low thermal conductivity, may be disposed in the groove 125. For example, when the piezoelectric film actuator 130 is made of PtZrTiO3 material, the thermal conductivity of PtZrTiO3 is approximately 2.1 W / mK, which is only about 1 / 100 of the thermal conductivity of aluminum (237 W / mK). Therefore, the region where the groove 125 is formed may have lower heat dissipation performance compared to other regions. The heat sink 160 can be used to enhance the heat dissipation performance of the region in the metal layer 120 where the groove 125 is formed.

[0064] To improve the heat dissipation performance of the area where the groove 125 forms the metal layer 120, the heat sink 160 can be a carbon-based heat sink with a higher thermal conductivity than the metal layer 120. The carbon-based heat sink can be a graphite plate, graphene plate, carbon nanotube plate, etc. For example, graphite with a high thermal conductivity of 400 W / mK to 600 W / mK has a higher thermal conductivity than aluminum (237 W / m). Therefore, using a carbon-based heat sink 160 is advantageous in terms of heat dissipation.

[0065] Figure 3 An example of the arrangement of a piezoelectric diaphragm actuator, housing, and heat sink is shown.

[0066] Reference Figure 3 An adhesive layer 310 may be disposed between the piezoelectric film actuator 130 and the housing 140 to ensure the connection between the piezoelectric film actuator 130 and the housing 140. The adhesive layer 310 may be disposed on the front surface of the housing 140, and the embodiments of this disclosure are not limited thereto. The adhesive layer 310 may be disposed on the rear surface of the piezoelectric film actuator 130.

[0067] like Figure 3 As shown, the adhesive layer 310 can be disposed between the heat sink 160 and the piezoelectric film actuator 130, and between the heat sink 160 and the metal layer 120.

[0068] Figure 4 A cross-section of a display device according to another embodiment is shown schematically.

[0069] and Figure 2 The display shown is similar. Figure 4 The display device shown may include a display panel 110, a metal layer 120, a piezoelectric film actuator 130, and a housing 140. Furthermore, at least one recess 125 may be disposed in the rear surface of the metal layer, and the piezoelectric film actuator 130 may be disposed in the recess 125 of the metal layer.

[0070] However, with Figure 2The display devices shown are different. Figure 4 The housing 140 of the display device shown can even cover the side and rear surfaces of the piezoelectric film actuator 130.

[0071] The groove size can sometimes be larger than the size of the piezoelectric film actuator. For example, even if piezoelectric film actuators of the same size are used, it can be expected that... Figure 4 The groove size w2 of the metal layer shown can be greater than Figure 2 The groove size w1 of the metal layer is shown. Alternatively, if the size of the piezoelectric film actuator is finite, it can be expected that this size can be smaller than the groove size.

[0072] In this case, gaps may be generated in the side surface of the piezoelectric film actuator 130. According to this embodiment, the housing 140 can even cover both the side and rear surfaces of the piezoelectric film actuator 130, allowing the gaps formed in the side surface of the piezoelectric film actuator 130 to be filled. Therefore, the vibrating area of ​​the display panel 110 can be increased, and heat dissipation performance can be improved. A large vibrating area of ​​the display is advantageous for overall sound pressure level and bass characteristics.

[0073] Figure 5 The rear surface of a display device according to yet another embodiment is shown schematically.

[0074] Reference Figure 1 The heat-generating element can be located on either side of the display panel or on either side of the metal layer 120 (typically the lower surface of the display panel). The heat-generating element can be a source pad, one of various printed circuit boards (e.g., a source PCB), one of various controllers, etc. Some of them (e.g., source pads) generate a large amount of heat. The area of ​​the metal layer where the recess is formed can be relatively thin. Therefore, if a recess is formed adjacent to this type of heat-generating element, there is a possibility that the characteristics of organic components (e.g., organic light-emitting diodes) disposed in the display panel may deteriorate due to heat.

[0075] exist Figure 5 In the embodiment shown, the groove 125 of the metal layer 120 can be formed away from the side S1 where the heating element is disposed.

[0076] Specifically, the groove 125 can be closer to the side S2 opposite to the side S1 where the heating element is disposed. For example, when the distance from the center of the groove to the side S1 where the heating element is disposed is a2 and the distance from the center to the opposite side S2 is a1, a1 <a2。

[0077] Figure 5 The display device shown can reduce or prevent the performance or lifespan of organic components, such as organic light-emitting diodes, from deteriorating due to heat. For example, Figure 5The display device shown can be applied to display devices that include organic light-emitting diode display panels.

[0078] Figure 6 This is a schematic cross-sectional view of a display device according to another embodiment. Figure 7 schematically shown Figure 6 The rear surface of the display device shown.

[0079] Similar to Figure 2 or Figure 4 The display device shown, Figure 6 The display device shown may include: a metal layer 120 having a rear surface with a groove 125 formed therein; a display panel 110 disposed on the front surface of the metal layer; and a piezoelectric film actuator 130 disposed in the groove 125. Therefore, Figure 2 or Figure 4 Most of the features of the display device shown can also be applied to Figure 6 The display device shown can exclude duplicate descriptions.

[0080] at the same time, Figure 6 The display device shown is characterized in that the driver 150 is disposed together with the piezoelectric film actuator 130 in the groove 125 of the metal layer 120. Furthermore, Figure 6 The display device shown is characterized by a driver 150 and a connecting cable ( Figure 6 (As shown in the middle) It is not exposed on the back surface of the metal layer.

[0081] The following will describe it in more detail. Figure 6 and Figure 7 The display device shown.

[0082] The driver 150 can be disposed in a recess in the metal layer 120. As an example, the driver 150 can be disposed in the central region of the recess 125.

[0083] The piezoelectric diaphragm actuator 130 can be disposed on at least one side of the driver 150. For example... Figure 6 As shown, the actuator 150 and the piezoelectric film actuator 130 can be arranged at a predetermined interval. As another example, the actuator 150 and the piezoelectric film actuator 130 can be spaced apart by a predetermined distance, and a housing can be disposed in the space between the actuator 150 and the piezoelectric film actuator 130. As yet another example, the actuator 150 and the piezoelectric film actuator 130 can be arranged without any interval.

[0084] exist Figure 6 and Figure 7In the display device shown, the driver 150 can be disposed in the center of the groove 125, and the piezoelectric film actuator 130 can be disposed on both sides of the groove 125. In this case, the size w3 of the groove 125 can be relatively large, which is advantageous in ensuring the lateral vibration area.

[0085] The piezoelectric diaphragm actuator 130 can be electrically connected to the driver 150 via a connecting wire.

[0086] The housing 140 may cover the rear surface of the actuator 150 and the rear surface of one or more piezoelectric diaphragm actuators 130. For example... Figure 6 As shown, the housing 140 can even cover the side surface of the piezoelectric film actuator 130.

[0087] A heat sink 160 may be disposed on the front surface of the driver 150 and the front surface of the piezoelectric film actuator 130. As an example, the driver 150 and a plurality of piezoelectric film actuators 130 may be disposed on the rear surface of the heat sink 160. The driver 150, the piezoelectric film actuators 130 and the heat sink 160 may be covered by a housing 140.

[0088] Figure 6 and Figure 7 The display device shown can increase the vibration area and improve the appearance of the rear surface because the driver 150 and the connecting wires are covered by the housing 140.

[0089] Figure 8 An example of a piezoelectric film actuator that can be used in a display device of this disclosure is illustrated schematically.

[0090] like Figure 8 As shown in the example, the piezoelectric film actuator 130 can be formed into a curved pattern. The directionality of sound can be controlled by frequency synthesis of the sound output from the curved pattern of the piezoelectric film actuator 130.

[0091] The piezoelectric film actuator 130 can be formed solely from a piezoelectric film, or the piezoelectric film can be attached to a support plate. The piezoelectric film actuator 130 can output sound in the audible frequency band through vibration based on the frequency input.

[0092] Reference Figure 8 The piezoelectric film actuator 130 may have a structure in which a first electrode layer 233, a piezoelectric element layer 231, and a second electrode layer 235 are stacked in multiple layers. The first electrode layer 233 and the second electrode layer 235 may be electrically connected to the driver 150.

[0093] The piezoelectric element layer 231 can be formed from various known piezoelectric materials, such as piezoelectric ceramics like PtZrTiO3, BaTiO3, and Pb(Zr,Ti)O3, and piezoelectric polymers like PVDF (polyvinylidene fluoride), P(VDF-TrFe) (poly(vinylidene fluoride-trifluoroethylene)), and (VDFTeFE) (poly(vinylidene fluoride-tetrafluoroethylene)).

[0094] The first electrode layer 233 can be disposed on one surface of the piezoelectric element layer 231, and the second electrode layer 235 can be disposed on the other surface of the piezoelectric element layer 231. Terminal portions 132a and 132b can be disposed on the first electrode layer 233 and the second electrode layer 235, respectively.

[0095] The piezoelectric element layer 231 can deform in at least one direction, either the thickness direction or the longitudinal direction, based on an acoustic signal applied to the first electrode layer 233 and the second electrode layer 235, and can output sound through vibrations generated by the deformation. Specifically, the piezoelectric element layer 231 can output sound by vibrating while expanding and contracting in at least one direction, either the thickness direction or the longitudinal direction.

[0096] These embodiments have been described above with reference to several illustrative embodiments. However, this disclosure is not intended to limit the embodiments and drawings set forth herein, and many other modifications and embodiments can be devised by those skilled in the art. Furthermore, although not explicitly described in the description of the embodiments, the effects and predictable effects based on the configurations in this disclosure will be included within the scope of this disclosure.

Claims

1. A display device, the display device comprising: A metal layer having a rear surface in which at least one groove is provided; The display panel is disposed on the front surface of the metal layer, wherein the entire front surface of the metal layer is attached to the entire rear surface of the display panel via an adhesive layer, and the metal layer serves as a heat sink. A piezoelectric film actuator, wherein the piezoelectric film actuator is disposed in the groove of the metal layer, and the front surface and side surface of the piezoelectric film actuator are surrounded by the inner surface of the metal layer in the groove; and A housing, which is configured to cover the rear surface of the piezoelectric film actuator.

2. The display device according to claim 1, wherein, The size of the piezoelectric film actuator is smaller than the size of the groove, and The housing covers the rear and side surfaces of the piezoelectric diaphragm actuator.

3. The display device according to claim 1, further comprising: A driver, configured to drive the piezoelectric film actuator, is disposed in a region other than the region in the rear surface of the metal layer where the groove is provided.

4. The display device according to claim 1, further comprising: An adhesive layer is disposed between the piezoelectric film actuator and the housing.

5. The display device according to claim 1, further comprising: A heat sink is disposed on the front surface of the piezoelectric film actuator.

6. The display device according to claim 5, wherein, The thermal conductivity of the heat sink is higher than that of the metal layer.

7. The display device according to claim 5, wherein, The heat sink is a carbon-based heat sink.

8. The display device according to claim 5, further comprising: An adhesive layer is disposed between the heat sink and the metal layer, and between the heat sink and the piezoelectric film actuator.

9. The display device according to claim 1, wherein, The outer shell is made of the same material as the metal layer.

10. The display device according to claim 1, further comprising: A heating element is disposed on one side of the display panel or the metal layer. The groove is positioned closer to the side opposite to the side where the heating element is located.

11. The display device according to claim 1, wherein, The adhesive layer includes a getter material.

12. A display device, the display device comprising: A metal layer having a rear surface in which a groove is provided; The display panel is disposed on the front surface of the metal layer, wherein the entire front surface of the metal layer is attached to the entire rear surface of the display panel via an adhesive layer, and the metal layer serves as a heat sink. A driver, the driver being disposed in the groove of the metal layer; A piezoelectric film actuator, wherein the piezoelectric film actuator is disposed in a groove of the metal layer on at least one side of the actuator, the front surface and side surface of the piezoelectric film actuator are surrounded by the inner surface of the metal layer in the groove, and are electrically connected to the actuator; and A housing is configured to cover the rear surface of the actuator and the rear surface of the piezoelectric film actuator.

13. The display device according to claim 12, further comprising: An adhesive layer is disposed between the piezoelectric film actuator and the housing.

14. The display device according to claim 12, further comprising: A heat sink is disposed on the front surface of the driver and the front surface of the piezoelectric film actuator.

15. The display device according to claim 14, wherein, The thermal conductivity of the heat sink is higher than that of the metal layer.

16. The display device according to claim 14, wherein, The heat sink is a carbon-based heat sink.

17. The display device according to claim 14, further comprising: An adhesive layer is disposed between the heat sink and the metal layer, and between the heat sink and the piezoelectric film actuator.

18. The display device according to claim 12, wherein, The outer shell is made of the same material as the metal layer.

19. The display device according to claim 12, further comprising: A heating element is disposed on one side of the display panel or the metal layer. The groove is positioned closer to the side opposite to the side where the heating element is located.

20. The display device according to claim 12, wherein, The adhesive layer includes a getter material.

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