Display device

Abstract

The utility model provides a display device which can restrain the reduction of visibility and reduce contact sound at the same time. This display device is provided with: a panel having a base section having a first main surface and a second main surface on the opposite side from the first main surface, and a plurality of convex sections provided on the second main surface; a piezoelectric actuator that is disposed on the first main surface and generates vibration; and a display part which faces the first main surface and in which the diameter of the convex parts in plan view is 0.05 mm to 3 mm inclusive, the height of the convex parts is 5 [mu] m to 50 [mu] m inclusive, the pitch of the convex parts is 0.5 mm to 5 mm inclusive, and the ratio of the diameter of the convex parts to the height of the convex parts is 5 to 200 inclusive.

Description

Technical Field

[0001] This disclosure relates to display devices. Background Technology

[0002] In smartphones, car navigation systems, and other devices, there is sometimes a force feedback function that vibrates when the touch panel is operated to notify that the input has been accepted. In recent years, in addition to vibrations for notification, research and development have also been conducted on haptic technologies that use various variations in vibration to represent the tactile feel of the display or to indicate the position of the operation.

[0003] Such tactile technology can be achieved by making a piezoelectric actuator, which is attached to the tactile panel, vibrate at a frequency in the ultrasonic band. The vibration in the ultrasonic band forms a standing wave on the tactile panel, and when the tactile panel is touched by a finger or other object, a tactile sensation can be perceived. By changing the signal pattern supplied to the piezoelectric actuator, various changes in tactile sensation can be represented.

[0004] Here, when a finger or other object touches the surface of a vibrating tactile panel, a contact sound sometimes occurs. In response, Patent Document 1 discloses a display device that reduces contact sound by increasing the surface roughness of the tactile panel.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-016111

[0006] However, in conventional display devices that increase the surface roughness of the tactile panel, light passing through the tactile panel undergoes diffuse reflection on its surface, reducing visibility. Utility Model Content

[0007] The purpose of this disclosure is to provide a display device that can reduce touch noise while suppressing the reduction of visibility.

[0008] According to one aspect of this disclosure, a display device includes: a panel having a base and a plurality of protrusions, the base having a first main surface and a second main surface opposite to the first main surface, the plurality of protrusions being disposed on the second main surface; a piezoelectric actuator disposed on the first main surface and generating vibration; and a display portion facing the first main surface, wherein the diameter of the protrusions, when viewed from above, is 0.05 mm or more and 3 mm or less, the height of the protrusions is 5 μm or more and 50 μm or less, the spacing between the protrusions is 0.5 mm or more and 5 mm or less, and the ratio of the diameter of the protrusion to the height of the protrusion is 5 or more and 200 or less.

[0009] In one embodiment of this disclosure, the base preferably has a glass material having the first main surface, and the protrusion has a resin material.

[0010] In one embodiment of this disclosure, the panel preferably comprises: a glass material having the first main surface and a third main surface opposite to the first main surface; and a resin film disposed on the third main surface, the resin film comprising: a first portion having the second main surface and a fourth main surface opposite to the second main surface and in contact with the third main surface of the glass material; and a plurality of second portions disposed on the second main surface, the base being formed by the glass material and the first portions, and the protrusions being formed by the second portions.

[0011] In one embodiment of this disclosure, the panel preferably has a resin material having the base and the protrusion.

[0012] According to this disclosure, it is possible to reduce contact noise while suppressing the reduction in visibility. Attached Figure Description

[0013] Figure 1 This is a side view showing the display device according to the first embodiment.

[0014] Figure 2 This is a top view showing the display device according to the first embodiment.

[0015] Figure 3 This is a bottom view showing the display device according to the first embodiment.

[0016] Figure 4 This is a cross-sectional view showing the display device according to the first embodiment.

[0017] Figure 5 This is a cross-sectional view showing a piezoelectric actuator.

[0018] Figure 6 This is a schematic diagram illustrating the basic operation of a display device.

[0019] Figure 7 This is a diagram showing the tactile panel included in the display device of the first embodiment.

[0020] Figure 8 It is a graph showing the relationship between diameter Φ and tactile sensation, contact sound, and friction sound.

[0021] Figure 9 It is a graph showing the relationship between height H and tactile sensation, contact sound, and friction sound.

[0022] Figure 10 This is a graph showing the relationship between the spacing P and the tactile sensation, contact sound, and friction sound.

[0023] Figure 11 It is a graph showing the relationship between R and tactile sensation, contact sound, and friction sound.

[0024] Figure 12 This is a graph showing the sound pressure characteristics.

[0025] Figure 13 This is a cross-sectional view showing the tactile panel included in the display device of the second embodiment.

[0026] Figure 14 This is a cross-sectional view showing the tactile panel included in the display device of the third embodiment.

[0027] Figure 15 This is a top view showing a modified example of a tactile panel.

[0028] Label Explanation

[0029] 11, 25: Glass material; 11a, 21a, 31a: Second main surface; 12, 26, 36: Resin material; 21, 31: Base; 22: Second part; 25a: Third main surface; 27: First part; 32: Protrusion; 100: Display device; 101: Display panel; 102: Touch panel; 103: Tactile panel; 103c: First main surface; 104: Piezoelectric actuator. Detailed Implementation

[0030] The embodiments of this disclosure will be described in detail below, but this disclosure is not limited thereto. Furthermore, in this specification and the accompanying drawings, elements having substantially the same functional structure are sometimes omitted from repeated descriptions by using the same reference numerals.

[0031] (First Embodiment)

[0032] The first embodiment will be described. The first embodiment relates to a display device.

[0033] [Structure of the display device]

[0034] The structure of the display device according to the first embodiment will be described. Figure 1 This is a side view showing the display device according to the first embodiment. Figure 2 This is a top view showing the display device according to the first embodiment. Figure 3 This is a bottom view showing the display device according to the first embodiment. Figure 4 This is a cross-sectional view showing the display device according to the first embodiment. Figure 4 Equivalent to along Figure 2 and Figure 3 A cross-sectional view along line IV-IV.

[0035] like Figures 1-4 As shown, the display device 100 of the first embodiment includes a display panel 101, a touch panel 102, a tactile panel 103, and a piezoelectric actuator 104. Figure 2 and Figure 3 As shown, the display device 100 is flat and has a rectangular shape when viewed from the thickness direction. In the figures of this disclosure, for convenience, the long side direction of the display device 100 is designated as the X direction, the short side direction as the Y direction, and the thickness direction as the Z direction.

[0036] The display panel 101, serving as the display unit, is a panel for displaying images and utilizes liquid crystal or organic EL (electro-luminescence) technology. The structure of the display panel 101 is not particularly limited and can be configured as a display with a general structure. A first signal line 131 is connected to one end of the display panel 101. The other end of the first signal line 131 is connected to a control device (not shown). Control signals from the control device are input to the display panel 101 via the first signal line 131.

[0037] A touch panel 102 is disposed on the display panel 101 and detects user operations on the display device 100, such as finger gestures. The touch panel 102 is configured to detect touches and clicks on the tactile panel 103. The touch panel 102 has an array of touch sensors, preferably capacitive. The touch panel 102 can be formed by laminating a touch panel body with a protective cover glass, or it can be an integral part of the touch panel body and the protective cover glass. Figure 4 As shown, the touch panel 102 has a fourth main surface 102c on the side of the display panel 101 and a fifth main surface 102b on the opposite side of the fourth main surface 102c. The touch panel 102 is connected to one end of a second signal line 132. The other end of the second signal line 132 is connected to a control device. A detection signal indicating the detection result of the touch panel 102 is input to the control device via the second signal line 132. The detection signal at least indicates the touched position of the tactile panel 103.

[0038] A tactile panel 103, serving as the touch panel, is disposed on the touch panel 102 to present a tactile experience to the user. For example... Figure 1 As shown, the tactile panel 103 has a longer side than other components such as the touch panel 102, and a portion 103a protruding from the other components. This portion 103a engages with a piezoelectric actuator 104, which generates vibrations. Details of the structure of the tactile panel 103 will be described later. Figure 4 As shown, the tactile panel 103 has a first main surface 103c opposite to the fifth main surface 102b of the touch panel 102 and a sixth main surface 103b located on the opposite side of the first main surface 103c. Additionally, as... Figure 1 and Figure 4As shown, the first main surface 103c and the fifth main surface 102b can contact each other, but a gap can exist between the first main surface 103c and the fifth main surface 102b so that the vibration of the tactile panel 103 does not attenuate. This gap is set so that the touch panel 102 can detect the degree of touch and click on the tactile panel 103.

[0039] A piezoelectric actuator 104 is coupled to a tactile panel 103 to generate vibration. For example... Figure 1 As shown, the piezoelectric actuator 104 is engaged with the first main surface 103c at a portion 103a of the tactile panel 103. Figure 5 This is a cross-sectional view showing the piezoelectric actuator 104. (See attached image.) Figure 5 As shown, the piezoelectric actuator 104 has a piezoelectric element 121, a first electrode 122, and a second electrode 123. The piezoelectric element 121 is made of a piezoelectric material such as PZT (lead zirconate titanate).

[0040] The first electrode 122 has a first internal electrode 124 and a first external electrode 125. The first internal electrode 124 is made of a conductive material and has multiple layers disposed within the piezoelectric body 121. The first external electrode 125 is made of a conductive material and is connected to the first internal electrode 124. The second electrode 123 has a second internal electrode 126 and a second external electrode 127. The second internal electrode 126 is made of a conductive material and has multiple layers disposed within the piezoelectric body 121. The second external electrode 127 is made of a conductive material and is connected to the second internal electrode 126.

[0041] like Figure 5 As shown, the first internal electrode 124 and the second internal electrode 126 are alternately arranged and opposed to each other across the piezoelectric element 121. Furthermore, the number of layers of the first internal electrode 124 and the second internal electrode 126 is not limited to three layers each. Figure 2 and Figure 3 As shown, a first wiring 128 is connected to the first electrode 122, and a second wiring 129 is connected to the second electrode 123. The first wiring 128 and the second wiring 129 are connected to a control device and transmit the drive signal output from the control device to the first electrode 122 and the second electrode 123.

[0042] When a voltage is applied between the first electrode 122 and the second electrode 123 via the drive signal, the piezoelectric element 121 deforms due to the inverse piezoelectric effect, thereby generating vibration. Here, in the display device 100, by supplying an ultrasonic drive signal to the piezoelectric actuator 104 via a control device, the piezoelectric actuator 104 can generate vibration in the ultrasonic frequency band. The frequency of the ultrasonic frequency band is, for example, 20 kHz or higher. The frequency of the ultrasonic frequency band can be 20 kHz or higher and 60 kHz or lower. Furthermore, as... Figure 5As shown, the piezoelectric actuator 104 may have a stacked structure in which the first electrode 122 and the second electrode 123 are alternately stacked with the piezoelectric body 121 in between, or it may have other structures.

[0043] [Basic Operation of Display Devices]

[0044] The basic operation of the display device 100 will be explained. Figure 6 This is a schematic diagram illustrating the basic operation of the display device 100. (For example...) Figure 6 As shown, when the user's finger F is in contact with the sixth main surface 103b of the tactile panel 103, the piezoelectric actuator 104 (see reference) is activated. Figures 1 to 3 When the ultrasonic frequency band is used for vibration, the vibration is transmitted to the tactile panel 103, and the tactile panel 103 vibrates. As a result, the finger F can perceive touch.

[0045] Furthermore, the contact of finger F with tactile panel 103 is detected by touch panel 102 and input to control device via second signal line 132. In addition, display panel 101 is controlled by control device via first signal line 131, and the image displayed on display panel 101 can be visually recognized via touch panel 102 and tactile panel 103.

[0046] [Details of the tactile panel]

[0047] Details of the tactile panel 103 are explained. Figure 7 This is a diagram showing the tactile panel 103 included in the display device of the first embodiment. Figure 7 (a) is a top view. Figure 7 (b) is along Figure 7 A sectional view of line VIIb-VIIb in (a).

[0048] like Figure 7 As shown, in the first embodiment, the tactile panel 103 has a glass material 11 and a plurality of convex resin materials 12.

[0049] The glass material 11 has a first main surface 103c. The transmittance of visible light of the glass material 11 is, for example, 80% or more. The glass material 11 has a second main surface 11a located on the opposite side of the first main surface 103c. The glass material 11 is an example of a base.

[0050] Resin material 12 is disposed on the second main surface 11a. Resin material 12 may include, for example, silicone-based resin, acrylic resin, polyethylene-based resin, polyisoprene, polyacrylamide, or polyester. The visible light transmittance of resin material 12 is, for example, 80% or more. The shape of resin material 12 is generally cylindrical. For example, the central axis of resin material 12 is orthogonal to the second main surface 11a. Resin material 12 is, for example, disposed at grid points of a square lattice when viewed from above. Resin material 12 is an example of a protrusion.

[0051] The diameter Φ of the resin material 12 is 0.05 mm or more and 3 mm or less. If the diameter Φ is less than 0.05 mm, the tactile sensation based on ultrasonic vibration, such as a smooth tactile sensation, is reduced. If the diameter Φ is greater than 3 mm, the contact sound cannot be reduced. Therefore, the diameter Φ is 0.05 mm or more and 3 mm or less. In addition, if the diameter Φ is 0.08 mm or more, friction sound can be reduced. Friction sound is the sound generated by the friction between the tactile panel 103 and the finger when the finger is moved in a non-vibrating state. Therefore, the diameter Φ is preferably 0.08 mm or more and 3 mm or less. The diameter Φ is more preferably 0.1 mm or more and 1 mm or less. The resin material 12 may also be in the shape of an elliptical cylinder, a frustum conical shape, etc. In this disclosure, the diameter of the protrusion refers to the equivalent circle diameter in the top surface of the protrusion.

[0052] The height H of the resin material 12 is 5 μm or more and 50 μm or less. If the height H is less than 5 μm, contact noise cannot be reduced. If the height H is greater than 50 μm, the tactile sensation based on ultrasonic vibration is reduced. Therefore, the height H is 5 μm or more and 50 μm or less. In addition, if the height H is less than 50 μm, friction noise can be reduced. The height H is preferably 10 μm or more and 40 μm or less.

[0053] The spacing P of the resin materials 12 is 0.5 mm or more and 5 mm or less. If the spacing P of the resin materials 12 is less than 0.5 mm, the tactile sensation based on ultrasonic vibration is reduced. If the spacing P of the resin materials 12 is greater than 5 mm, the contact sound cannot be reduced. Therefore, the spacing P is 0.5 mm or more and 5 mm or less. In addition, if the spacing P is 0.5 mm or more and 5 mm or less, friction sound can be reduced. The resin materials 12 can also be arranged irregularly. In this disclosure, the spacing of the protrusions refers to the distance between the centers when viewed from above, between the protrusions that are closest to each other when viewed from a certain protrusion.

[0054] The ratio R of the diameter Φ of the resin material 12 to its height H is 5 or more and 200 or less. If the ratio R is less than 5, the tactile sensation based on ultrasonic vibration is reduced. If the ratio R is greater than 200, the contact sound cannot be reduced. Therefore, the ratio R is 5 or more and 200 or less. In addition, if the ratio R is 10 or more, friction sound can be reduced. Therefore, the ratio R is preferably 10 or more and 200 or less. The ratio R is more preferably 20 or more and 100 or less.

[0055] In a tactile panel 103 having multiple resin materials 12 and glass materials 11 that satisfy these conditions, light transmitted through the tactile panel 103 is less likely to be diffusely reflected on the surface of the tactile panel 103 (the sixth main surface 103b), thus suppressing the reduction in visibility. Therefore, the display device 100 according to the first embodiment can reduce contact noise while suppressing the reduction in visibility. Alternatively, contact noise can be reduced by increasing the surface roughness of the tactile panel through sandblasting or the like, but in this case, light emitted from the display panel is diffusely reflected on the surface of the tactile panel, reducing visibility.

[0056] For example, the tactile panel 103 included in the first embodiment can be obtained by forming a resin material 12 on the glass material 11. The resin material 12 can be formed, for example, by exposure and development of a photosensitive material.

[0057] Next, various experiments related to the shape of the resin material 12 conducted by the applicant of this utility model will be described.

[0058] [Experiment 1]

[0059] In Experiment 1, the height H of the resin material 12 was set to 10 μm, the spacing P to 2.0 mm, and the ratio R to 0.1 to 500. The relationship between the diameter Φ and tactile sensation, contact sound, and frictional sound was investigated. The results were presented in... Figure 8 As shown in the image. Figure 8 (a) shows the relationship between diameter Φ and tactile sensation. Figure 8 (b) shows the relationship between diameter Φ and contact sound. Figure 8 (c) shows the relationship between diameter Φ and frictional sound.

[0060] like Figure 8 As shown in (a), a good tactile feel was achieved in the range where the diameter Φ is 0.05 mm or more. Figure 8 As shown in (b), the contact sound decreases in the range of diameter Φ between 0.01 mm and 3 mm. Figure 8 As shown in (c), the frictional noise decreases in the range where the diameter Φ is above 0.08 mm.

[0061] [Experiment 2]

[0062] In Experiment 2, the diameter Φ of the resin material 12 was set to 0.3 mm, the spacing P to 2.0 mm, and the ratio R to 3-300. The relationship between height H and tactile sensation, contact sound, and frictional sound was investigated. The results were presented in... Figure 9 As shown in the image. Figure 9 (a) shows the relationship between height H and tactile sensation. Figure 9 (b) shows the relationship between height H and contact sound. Figure 9 (c) shows the relationship between height H and frictional sound.

[0063] like Figure 9 As shown in (a), a good tactile feel was obtained in the range where the height H is below 50 μm. Figure 9 As shown in (b), the contact sound decreases in the range where the height H is 5 μm or more. Figure 9 As shown in (c), frictional noise decreases in the range where the height H is below 50 μm.

[0064] [Experiment 3]

[0065] In Experiment 3, the diameter Φ of resin material 12 was set to 0.3 mm, the height H to 10 μm, and the ratio R to 30. The relationship between the spacing P and tactile sensation, contact sound, and frictional sound was investigated. The results were presented in... Figure 10 As shown in the image. Figure 10 (a) shows the relationship between spacing P and tactile sensation. Figure 10 (b) shows the relationship between the distance P and the contact sound. Figure 10 (c) shows the relationship between the spacing P and the frictional sound.

[0066] like Figure 10 As shown in (a), a good tactile feel was obtained within a range where the spacing P is 0.5 mm or more. Figure 10 As shown in (b), the contact sound decreases within a distance P of 0.1 mm to 5 mm. Figure 10 As shown in (c), the frictional noise decreases in the range where the spacing P is greater than or equal to 0.001 mm and less than or equal to 10 mm.

[0067] [Experiment 4]

[0068] In Experiment 4, the diameter Φ of the resin material 12 was set to 0.01 mm to 1 mm, the height H to 1 μm to 100 μm, and the spacing P to 2.0 mm. The relationship between the ratio R and tactile sensation, contact sound, and frictional sound was investigated. The results were presented in... Figure 11 As shown in the image. Figure 11 (a) shows the relationship between R and tactile sensation. Figure 11 (b) shows the relationship between R and contact sound. Figure 11 (c) shows the relationship between R and frictional sound.

[0069] like Figure 11 As shown in (a), a good tactile feel was obtained in the range where R is greater than 5. Figure 11 As shown in (b), the contact sound decreases in the range below R=200. Figure 11 As shown in (c), friction noise decreases in the range where R is greater than 10.

[0070] [Experiment 5]

[0071] In the fifth experiment, according to the first embodiment, a display device with a resin material 12 having a diameter Φ of 0.05 mm, a height H of 10 μm, a pitch P of 0.5 mm, and a ratio R of 10 was manufactured, and the sound pressure characteristics when a finger contacts the tactile panel 103 were measured. Additionally, for comparison, a display device (comparative example) having a tactile panel without the resin material 12 (protrusion) was also manufactured, and the sound pressure characteristics when a finger contacts the tactile panel were measured. Figure 12 This is a graph showing the sound pressure characteristics. Figure 12 (a) shows the sound pressure characteristics of the display device according to the first embodiment. Figure 12 (b) shows the sound pressure characteristics of the display device in the comparative example. Figure 12 In this context, the input frequency to the piezoelectric actuator 104 is referred to as the "input frequency," and the frequency of 1 / 4 of that input frequency is referred to as the "1 / 4 frequency." Furthermore, the input frequency is in the ultrasonic band, which is off the audible band, but the 1 / 4 frequency is included in the audible band.

[0072] like Figure 12 As shown in (b), in the comparative example display device, peaks exist at the input frequency and the quarter frequency. This indicates that a contact sound is generated at the quarter frequency. On the other hand, as... Figure 12 As shown in (a), in the display device 100 of the first embodiment, there is a peak at the input frequency, but no peak at the 1 / 4 frequency. This means that even if a finger touches the tactile panel 103, no contact sound is generated.

[0073] (Second Implementation)

[0074] The second embodiment will be described. The main difference between the second embodiment and the first embodiment lies in the structure of the tactile panel 103. Figure 13 This is a cross-sectional view showing the tactile panel 103 included in the display device of the second embodiment.

[0075] In the display device of the second embodiment, the tactile panel 103 has a glass material 25 and a resin material 26.

[0076] The glass material 25 has a first principal surface 103c. The transmittance of visible light of the glass material 25 is, for example, 80% or more. The glass material 25 has a third principal surface 25a located on the opposite side of the first principal surface 103c.

[0077] Resin material 26 is disposed on the third main surface 25a. Resin material 26 may contain, for example, polyethylene terephthalate (PET). The visible light transmittance of resin material 26 is, for example, 80% or more. Resin material 26 has a film-like first portion 27 and a plurality of convex second portions 22. The first portion 27 is in contact with the third main surface 25a. A base 21 is formed by glass material 25 and the first portion 27. The base 21 has a second main surface 21a located opposite the first main surface 103c. The second portions 22 are disposed on the second main surface 21a. The shape of the second portions 22 is generally cylindrical. For example, the central axis of the second portion 22 is orthogonal to the second main surface 21a. The second portions 22 are, for example, arranged at grid points in a square grid when viewed from above. The second portion 22 is an example of a convex portion and has the same structure as the resin material 12 of the first embodiment.

[0078] The other structures are substantially the same as in the first embodiment. According to the second embodiment, the same effects as in the first embodiment can also be obtained.

[0079] The tactile panel 103 included in the second embodiment can be obtained, for example, by adhering a resin material 26 to a glass material 11. The resin material 26 can be formed, for example, by injection molding using a mold.

[0080] (Third implementation)

[0081] The third embodiment will be described. The main difference between the third embodiment and the first embodiment lies in the construction of the tactile panel 103. Figure 14 This is a cross-sectional view showing the tactile panel 103 included in the display device of the third embodiment.

[0082] In the display device of the third embodiment, the tactile panel 103 has a resin material 36. The visible light transmittance of the resin material 36 is, for example, 80% or more. The resin material 36 has a base 31 and a plurality of protrusions 32. The resin material 36 includes, for example, silicone resin, acrylic resin, polyethylene resin, polyisoprene, polyacrylamide, or polyester.

[0083] The base 31 has a first main surface 103c. The base 31 has a second main surface 31a located opposite to the first main surface 103c. A protrusion 32 is provided on the second main surface 31a. The protrusion 32 is generally cylindrical in shape. For example, the central axis of the protrusion 32 is orthogonal to the second main surface 31a. The protrusion 32 is, for example, arranged at a grid point of a square grid when viewed from above. The protrusion 32 has the same structure as the resin material 12 of the first embodiment.

[0084] The other structures are substantially the same as in the first embodiment. According to the third embodiment, the same effects as in the first embodiment can also be obtained.

[0085] The resin material 36 of the tactile panel 103 included in the third embodiment can be formed, for example, by injection molding using a mold.

[0086] The arrangement of the protrusions is not limited to Figure 7 The illustrated arrangement. For example, as shown... Figure 15 As shown, in the first embodiment, the resin material 12 can also be disposed at the grid points of the equilateral triangular lattice when viewed from above. The same applies to the second part 22 in the second embodiment and the protrusion 32 in the third embodiment.

[0087] The manner of this disclosure is as follows, for example.

[0088] A display device comprising: a panel having a base and a plurality of protrusions, the base having a first main surface and a second main surface opposite to the first main surface, the plurality of protrusions being disposed on the second main surface; a piezoelectric actuator disposed on the first main surface and generating vibration; and a display portion facing the first main surface, wherein the diameter of the protrusions, when viewed from above, is 0.05 mm or more and 3 mm or less, the height of the protrusions is 5 μm or more and 50 μm or less, the spacing between the protrusions is 0.5 mm or more and 5 mm or less, and the ratio of the diameter of the protrusion to the height of the protrusion is 5 or more and 200 or less.

[0089] Preferably, the base has a glass material having the first main surface, and the protrusion has a resin material.

[0090] Preferably, the panel comprises: a glass material having the first main surface and a third main surface opposite to the first main surface; and a resin film disposed on the third main surface, the resin film comprising: a first portion having the second main surface and a fourth main surface opposite to the second main surface and in contact with the third main surface of the glass material; and a plurality of second portions disposed on the second main surface, the base being formed by the glass material and the first portions, and the protrusions being formed by the second portions.

[0091] Preferably, the panel has a resin material having the base and the protrusion.

Claims

1. A display device, characterized in that, The display device has: A panel having a base and a plurality of protrusions, the base having a first main surface and a second main surface opposite to the first main surface, the plurality of protrusions being disposed on the second main surface; A piezoelectric actuator is disposed on the first main surface and generates vibration; as well as The display unit is positioned opposite the first main face. The diameter of the protrusion, viewed from above, is 0.05 mm or more and 3 mm or less. The height of the protrusion is more than 5 μm and less than 50 μm. The spacing between the protrusions is 0.5 mm or more and 5 mm or less. The ratio of the diameter of the protrusion to the height of the protrusion is 5 or more and 200 or less.

2. The display device according to claim 1, characterized in that, The base has a glass material having the first main surface. The protrusion is made of resin material.

3. The display device according to claim 1, characterized in that, The panel has: A glass material having the first main surface and a third main surface located opposite the first main surface; and A resin film is disposed on the third main surface. The resin film has the following characteristics: Part 1, having the second main surface and a fourth main surface located opposite the second main surface and in contact with the third main surface of the glass material; and Multiple second parts are disposed on the second main surface. The base is formed by the glass material and the first part. The convex portion is formed by the second part.

4. The display device according to claim 1, characterized in that, The panel has a resin material having the base and the protrusion.

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