Display device

Abstract

To provide a display device which can reduce a contact sound while suppressing degradation of visibility.SOLUTION: The display device includes: a panel including a base part having a first principal surface and a second principal surface opposite to the first principal surface and a plurality of projections provided on the second principal surface; a piezoelectric actuator which is arranged on the first principal surface and generates vibrations; and a display unit facing the first principal surface. Diameters of the projections are equal to or larger than 0.05 mm and equal to or smaller than 3 mm in plan view, heights of the projections are equal to or higher than 5 μm and equal to or lower than 50 μm, pitches of the projections are equal to or longer than 0.5 mm and equal to or shorter than 5 mm, and ratios of diameters of the projections to the heights of the projections are equal to or higher than 5 and equal to or lower than 200.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a display device. [Background technology]

[0002] Some smartphones, car navigation systems, and other devices are equipped with a force feedback function that vibrates when the touch panel is operated, thereby notifying users that their input has been accepted. In recent years, haptic technologies have been studied and developed that not only vibrate for notification purposes, but also allow users to express the feel of displayed objects and grasp the operating position by providing a variety of vibrations.

[0003] This type of tactile technology can be realized by vibrating a piezoelectric actuator attached to a tactile panel at an ultrasonic frequency. The ultrasonic vibrations create standing waves in the tactile panel, allowing users to sense tactile sensations when they touch the panel with their fingers or other objects. By changing the signal pattern supplied to the piezoelectric actuator, a wide variety of tactile sensations can be expressed.

[0004] When the surface of the vibrating tactile panel is touched with a finger or the like, contact noise may be generated. In response to this, Patent Document 1 discloses a display device that reduces contact noise by increasing the surface roughness of the tactile panel. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-016111 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in a conventional display device in which the surface roughness of the tactile panel is increased, light passing through the tactile panel is diffused on the surface of the tactile panel, resulting in reduced visibility.

[0007] An object of the present disclosure is to provide a display device that can reduce contact noise while suppressing a decrease in visibility. [Means for solving the problem]

[0008] According to one aspect of the present disclosure, a display device includes a base having a first main surface and a second main surface opposite the first main surface, a panel having a plurality of convex portions provided on the second main surface, a piezoelectric actuator disposed on the first main surface and generating vibrations, and a display unit facing the first main surface, wherein the diameter of the convex portions in a planar view is 0.05 mm or more and 3 mm or less, the height of the convex portions is 5 μm or more and 50 μm or less, the pitch of the convex portions is 0.5 mm or more and 5 mm or less, and the ratio of the diameter of the convex portions to the height of the convex portions is 5 or more and 200 or less. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to reduce contact noise while suppressing a decrease in visibility. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view showing a display device according to a first embodiment. [Figure 2] FIG. 1 is a top view showing a display device according to a first embodiment. [Figure 3] FIG. 2 is a bottom view showing the display device according to the first embodiment. [Figure 4] 1 is a cross-sectional view showing a display device according to a first embodiment. [Figure 5] FIG. 2 is a cross-sectional view showing a piezoelectric actuator. [Figure 6] FIG. 2 is a schematic diagram illustrating a basic operation of the display device. [Figure 7] 2 is a diagram showing a tactile panel included in the display device according to the first embodiment. FIG. [Figure 8] FIG. 10 is a diagram showing the relationship between the diameter φ and the tactile sensation, contact sound, and friction sound. [Figure 9]FIG. 10 is a diagram showing the relationship between height H and tactile sensation, contact sound, and friction sound. [Figure 10] FIG. 1 is a diagram illustrating the relationship between pitch P and tactile sensation, contact sound, and friction sound. [Figure 11] FIG. 10 is a diagram showing the relationship between the ratio R and the tactile sensation, contact noise, and friction noise. [Figure 12] FIG. 10 is a diagram illustrating sound pressure characteristics. [Figure 13] FIG. 10 is a cross-sectional view showing a tactile panel included in a display device according to a second embodiment. [Figure 14] FIG. 10 is a cross-sectional view showing a tactile panel included in a display device according to a third embodiment. [Figure 15] FIG. 10 is a top view showing a modified example of the tactile panel. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail, but the present disclosure is not limited thereto. In this specification and drawings, components having substantially the same functional configurations may be designated by the same reference numerals to avoid redundant description.

[0012] (First embodiment) A first embodiment will be described. The first embodiment relates to a display device.

[0013] [Display device configuration] The configuration of the display device according to the first embodiment will be described. Fig. 1 is a side view showing the display device according to the first embodiment. Fig. 2 is a top view showing the display device according to the first embodiment. Fig. 3 is a bottom view showing the display device according to the first embodiment. Fig. 4 is a cross-sectional view showing the display device according to the first embodiment. Fig. 4 corresponds to a cross-sectional view taken along line IV-IV in Figs. 2 and 3.

[0014] 1 to 4, a display device 100 according to the first embodiment includes a display panel 101, a touch panel 102, a tactile panel 103, and a piezoelectric actuator 104. As shown in FIGS. 2 and 3, the display device 100 is flat and rectangular when viewed in the thickness direction. In the drawings of the present disclosure, for convenience, the longitudinal direction of the display device 100 is designated as the X direction, the lateral direction is designated as the Y direction, and the thickness direction is designated as the Z direction.

[0015] The display panel 101 serving as a display unit is a panel that displays images, and is a display panel that uses liquid crystal or organic EL (electroluminescence), etc. The configuration of the display panel 101 is not particularly limited, and it can be a display having a general configuration. One end of a first signal line 131 is connected to the display panel 101. The other end of the first signal line 131 is connected to a control device (not shown). A control signal from the control device is input to the display panel 101 via the first signal line 131.

[0016] The touch panel 102 is disposed on the display panel 101 and detects operations on the display device 100 by a user's finger or the like. The touch panel 102 is configured to detect, for example, touches and taps on the tactile panel 103. The touch panel 102 includes an array of touch sensors, preferably capacitive touch sensors. The touch panel 102 may be formed by laminating a touch panel body and a protective cover glass, or by integrating the touch panel body and the protective cover glass. As shown in FIG. 4 , the touch panel 102 has a fourth main surface 102c facing the display panel 101 and a fifth main surface 102b opposite the fourth main surface 102c. One end of a second signal line 132 is connected to the touch panel 102. The other end of the second signal line 132 is connected to a control device. A detection signal indicating the detection result by the touch panel 102 is input to the control device via the second signal line 132. The detection signal indicates at least the touched position on the tactile panel 103.

[0017] The tactile panel 103 is disposed on the touch panel 102 and provides a tactile sensation to the user. As shown in FIG. 1, the tactile panel 103 has a longer side than other components, such as the touch panel 102, and has a portion 103a that protrudes from the other components. A piezoelectric actuator 104 is bonded to this portion 103a, and vibrations are generated by the piezoelectric actuator 104. The configuration of the tactile panel 103 will be described in detail below. As shown in FIG. 4, the tactile panel 103 has a first main surface 103c that faces the fifth main surface 102b of the touch panel 102, and a sixth main surface 103b that is opposite the first main surface 103c. Note that the first main surface 103c and the fifth main surface 102b may be in contact with each other as shown in FIGS. 1 and 4, but there may also be a gap between the first main surface 103c and the fifth main surface 102b to prevent attenuation of vibrations of the tactile panel 103. This gap is set to a level that allows the touch panel 102 to detect touches and taps on the tactile panel 103.

[0018] The piezoelectric actuator 104 is bonded to the tactile panel 103 and generates vibrations. As shown in FIG. 1, the piezoelectric actuator 104 is bonded to the first main surface 103c of the tactile panel 103 at a portion 103a. FIG. 5 is a cross-sectional view showing the piezoelectric actuator 104. As shown in FIG. 5, the piezoelectric actuator 104 includes a piezoelectric body 121, a first electrode 122, and a second electrode 123. The piezoelectric body 121 is made of a piezoelectric material such as PZT (lead zirconate titanate).

[0019] The first electrode 122 includes a first internal electrode 124 and a first external electrode 125. The first internal electrode 124 is made of a conductive material and is provided in multiple layers in 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 includes a second internal electrode 126 and a second external electrode 127. The second internal electrode 126 is made of a conductive material and is provided in multiple layers in the piezoelectric body 121. The second external electrode 127 is made of a conductive material and is connected to the second internal electrode 126.

[0020] As shown in Fig. 5, the first internal electrodes 124 and the second internal electrodes 126 are alternately arranged and face each other via the piezoelectric body 121. The number of layers of the first internal electrodes 124 and the second internal electrodes 126 is not limited to three each. As shown in Figs. 2 and 3, 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 drive signals output from the control device to the first electrode 122 and the second electrode 123.

[0021] When a voltage is applied between the first electrode 122 and the second electrode 123 by this drive signal, the piezoelectric body 121 deforms due to the inverse piezoelectric effect, generating vibration. Here, in the display device 100, the control device supplies an ultrasonic drive signal to the piezoelectric actuator 104, thereby causing the piezoelectric actuator 104 to vibrate in the ultrasonic band. The frequency of the ultrasonic band is, for example, 20 kHz or higher. The frequency of the ultrasonic band may be 20 kHz or higher and 60 kHz or lower. Note that the piezoelectric actuator 104 may have a layered structure in which the first electrodes 122 and the second electrodes 123 are alternately layered with the piezoelectric body 121 interposed therebetween, as shown in FIG. 5, or may have another structure.

[0022] [Basic operation of the display device] The basic operation of the display device 100 will be described. Fig. 6 is a schematic diagram showing the basic operation of the display device 100. As shown in Fig. 6, when a user vibrates the piezoelectric actuator 104 (see Figs. 1 to 3) in the ultrasonic band while keeping a finger F in contact with the sixth main surface 103b of the tactile panel 103, the vibration is transmitted to the tactile panel 103, causing the tactile panel 103 to vibrate. This allows the finger F to sense touch.

[0023] Furthermore, contact of the finger F with the tactile panel 103 is detected by the touch panel 102 and input to the control device via the second signal line 132. Furthermore, the display panel 101 is controlled by the control device via the first signal line 131, and the image displayed by the display panel 101 can be viewed via the touch panel 102 and the tactile panel 103.

[0024] [Details of the tactile panel] The tactile panel 103 will now be described in detail. Fig. 7 is a diagram showing the tactile panel 103 included in the display device according to the first embodiment. Fig. 7(a) is a top view, and Fig. 7(b) is a cross-sectional view taken along line VIIb-VIIb in Fig. 7(a).

[0025] As shown in FIG. 7, in the first embodiment, the tactile panel 103 has a glass material 11 and a plurality of convex resin materials 12.

[0026] Glass material 11 has a first main surface 103c. The visible light transmittance of glass material 11 is, for example, 80% or more. Glass material 11 has a second main surface 11a opposite to first main surface 103c. Glass material 11 is an example of a base.

[0027] The resin material 12 is provided on the second main surface 11a. The resin material 12 includes, for example, a silicone-based resin, an acrylic-based resin, a polyvinyl-based resin, polyisoprene, polyacrylamide, or polyester. The resin material 12 has a visible light transmittance of, for example, 80% or more. The resin material 12 is substantially cylindrical in shape. For example, the central axis of the resin material 12 is perpendicular to the second main surface 11a. The resin material 12 is, for example, arranged at the lattice points of a square lattice in plan view. The resin material 12 is an example of a convex portion.

[0028] 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 caused by the ultrasonic vibration, for example, the smooth tactile sensation, is reduced. If the diameter φ is more than 3 mm, contact noise cannot be reduced. Therefore, the diameter φ is 0.05 mm or more and 3 mm or less. Furthermore, if the diameter φ is 0.08 mm or more, friction noise can be reduced. Friction noise is noise generated by friction between the tactile panel 103 and a finger when the finger is moved while the tactile panel 103 is not vibrating. 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 have an elliptical cylindrical shape, a truncated cone shape, or the like. In the present disclosure, the diameter of a convex portion refers to the circle-equivalent diameter at the top surface of the convex portion.

[0029] 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 more than 50 μm, the tactile sensation caused by ultrasonic vibrations decreases. Therefore, the height H is 5 μm or more and 50 μm or less. Furthermore, if the height H is 50 μm or less, friction noise can be reduced. The height H is preferably 10 μm or more and 40 μm or less.

[0030] The pitch P of the resin material 12 is 0.5 mm or more and 5 mm or less. If the pitch P of the resin material 12 is smaller than 0.5 mm, the tactile sensation caused by ultrasonic vibrations is reduced. If the pitch P of the resin material 12 is larger than 5 mm, contact noise cannot be reduced. Therefore, the pitch P is 0.5 mm or more and 5 mm or less. Furthermore, if the pitch P is 0.5 mm or more and 5 mm or less, friction noise can be reduced. The resin material 12 does not need to be arranged regularly. In the present disclosure, the pitch of the protrusions refers to the center-to-center distance in a planar view between a certain protrusion and the protrusion located closest to it.

[0031] The ratio R of the diameter φ of the resin material 12 to the height H is 5 or more and 200 or less. If the ratio R is less than 5, the tactile sensation caused by the ultrasonic vibration is reduced. If the ratio R is more than 200, contact noise cannot be reduced. Therefore, the ratio R is 5 or more and 200 or less. Furthermore, if the ratio R is 10 or more, friction noise 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.

[0032] In the tactile panel 103 having a plurality of resin materials 12 and glass materials 11 that satisfy these conditions, light passing through the tactile panel 103 is less likely to be diffused on the surface (sixth main surface 103b) of the tactile panel 103, and a decrease in visibility can be suppressed. Therefore, the display device 100 according to the first embodiment can reduce contact noise while suppressing a decrease in visibility. Note that it is also possible to reduce contact noise by increasing the surface roughness of the tactile panel by blasting or the like, but in this case, light emitted from the display panel will be diffused on the surface of the tactile panel, resulting in a decrease in visibility.

[0033] The tactile panel 103 included in the first embodiment can be obtained, for example, by forming a resin material 12 on a glass material 11. The resin material 12 can be formed, for example, by exposing and developing a photosensitive material.

[0034] Next, various experiments on the shape of the resin material 12 conducted by the inventors of the present invention will be described.

[0035] [First Experiment] In the first experiment, the height H of the resin material 12 was set to 10 μm, the pitch P to 2.0 mm, and the ratio R to 0.1 to 500, and the relationship between the diameter φ and the tactile sensation, contact noise, and friction noise was investigated. The results are shown in Figure 8. Figure 8(a) shows the relationship between the diameter φ and the tactile sensation, Figure 8(b) shows the relationship between the diameter φ and the contact noise, and Figure 8(c) shows the relationship between the diameter φ and the friction noise.

[0036] As shown in Figure 8(a), a good tactile sensation was obtained when the diameter φ was in the range of 0.05 mm or more. As shown in Figure 8(b), the contact noise was reduced when the diameter φ was in the range of 0.01 mm to 3 mm. As shown in Figure 8(c), the friction noise was reduced when the diameter φ was in the range of 0.08 mm or more.

[0037] [Second Experiment] In the second experiment, the diameter φ of the resin material 12 was set to 0.3 mm, the pitch P to 2.0 mm, and the ratio R to 3 to 300, and the relationship between the height H and the tactile sensation, contact noise, and friction noise was investigated. The results are shown in Figure 9. Figure 9(a) shows the relationship between the height H and the tactile sensation, Figure 9(b) shows the relationship between the height H and the contact noise, and Figure 9(c) shows the relationship between the height H and the friction noise.

[0038] As shown in Figure 9(a), a good tactile sensation was obtained when the height H was 50 μm or less. As shown in Figure 9(b), the contact noise was reduced when the height H was 5 μm or more. As shown in Figure 9(c), the friction noise was reduced when the height H was 50 μm or less.

[0039] [Experiment 3] In the third experiment, the diameter φ of the resin material 12 was set to 0.3 mm, the height H to 10 μm, and the ratio R to 30, and the relationship between the pitch P and the tactile sensation, contact noise, and friction noise was investigated. The results are shown in Figure 10. Figure 10(a) shows the relationship between the pitch P and the tactile sensation, Figure 10(b) shows the relationship between the pitch P and the contact noise, and Figure 10(c) shows the relationship between the pitch P and the friction noise.

[0040] As shown in Figure 10(a), a good tactile sensation was obtained when the pitch P was in the range of 0.5 mm or more. As shown in Figure 10(b), contact noise was reduced when the pitch P was in the range of 0.1 mm to 5 mm. As shown in Figure 10(c), friction noise was reduced when the pitch P was in the range of 0.001 mm to 10 mm.

[0041] [Experiment 4] In the fourth experiment, the diameter φ of the resin material 12 was varied from 0.01 mm to 1 mm, the height H from 1 μm to 100 μm, and the pitch P was varied to 2.0 mm, and the relationship between the ratio R and the tactile sensation, contact noise, and friction noise was investigated. The results are shown in Figure 11. Figure 11(a) shows the relationship between the ratio R and the tactile sensation, Figure 11(b) shows the relationship between the ratio R and the contact noise, and Figure 11(c) shows the relationship between the ratio R and the friction noise.

[0042] As shown in Figure 11(a), a good tactile sensation was obtained when the ratio R was in the range of 5 or more. As shown in Figure 11(b), the contact noise was reduced when the ratio R was in the range of 200 or less. As shown in Figure 11(c), the friction noise was reduced when the ratio R was in the range of 10 or more.

[0043] [Experiment 5] In the fifth experiment, a display device was manufactured similar to the first embodiment, with the 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. The sound pressure characteristics were measured when a finger touched the tactile panel 103. For comparison, a display device (comparative example) having a tactile panel without the resin material 12 (protrusions) was also manufactured, and the sound pressure characteristics were measured when a finger touched the tactile panel. FIG. 12 shows sound pressure characteristics. FIG. 12(a) shows the sound pressure characteristics of the display device according to the first embodiment, and FIG. 12(b) shows the sound pressure characteristics of the display device according to the comparative example. In FIG. 12, the input frequency to the piezoelectric actuator 104 is shown as the “input frequency,” and the frequency that is ¼ of this input frequency is shown as the “¼ frequency.” Note that the input frequency is in the ultrasonic band, which is outside the audible band, but the ¼ frequency is within the audible band.

[0044] As shown in FIG. 12(b), in the display device according to the comparative example, peaks exist at the input frequency and 1 / 4 frequency. This indicates that contact noise occurs at the 1 / 4 frequency. On the other hand, as shown in FIG. 12(a), in the display device 100 according to the first embodiment, a peak exists at the input frequency but no peak exists at the 1 / 4 frequency. This indicates that no contact noise occurs even when a finger touches the tactile panel 103.

[0045] (Second embodiment) A second embodiment will now be described. The second embodiment differs from the first embodiment mainly in the configuration of the tactile panel 103. Fig. 13 is a cross-sectional view showing the tactile panel 103 included in the display device according to the second embodiment.

[0046] In the display device according to the second embodiment, the tactile panel 103 has a glass material 25 and a resin material .

[0047] The glass material 25 has a first main surface 103c. The visible light transmittance of the glass material 25 is, for example, 80% or more. The glass material 25 has a third main surface 25a on the opposite side to the first main surface 103c.

[0048] The resin material 26 is provided on the third main surface 25a. The resin material 26 includes, for example, polyethylene terephthalate (PET). The resin material 26 has a visible light transmittance of, for example, 80% or more. The resin material 26 has a film-like first portion 27 and a plurality of convex second portions 22. The first portion 27 contacts the third main surface 25a. The glass material 25 and the first portion 27 form a base 21. The base 21 has a second main surface 21a opposite to the first main surface 103c. The second portions 22 are provided on the second main surface 21a. The second portions 22 are substantially cylindrical in shape. For example, the central axis of the second portion 22 is perpendicular to the second main surface 21a. The second portions 22 are arranged, for example, at lattice points of a square lattice in a planar view. The second portions 22 are an example of convex portions and have a configuration similar to that of the resin material 12 in the first embodiment.

[0049] Other configurations are substantially the same as those of the first embodiment. The second embodiment can also achieve the same effects as those of the first embodiment.

[0050] The tactile panel 103 included in the second embodiment can be obtained, for example, by attaching a resin material 26 to a glass material 11. The resin material 26 can be formed, for example, by injection molding using a mold.

[0051] (Third embodiment) A third embodiment will now be described. The third embodiment differs from the first embodiment mainly in the configuration of the tactile panel 103. Fig. 14 is a cross-sectional view showing the tactile panel 103 included in the display device according to the third embodiment.

[0052] In the display device according to the third embodiment, the tactile panel 103 has a resin material 36. The resin material 36 has a visible light transmittance of, 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, a silicone-based resin, an acrylic-based resin, a polyvinyl-based resin, polyisoprene, polyacrylamide, or polyester.

[0053] The base 31 has a first main surface 103c. The base 31 has a second main surface 31a opposite to the first main surface 103c. The protrusions 32 are provided on the second main surface 31a. The shape of the protrusions 32 is approximately cylindrical. For example, the central axis of the protrusions 32 is perpendicular to the second main surface 31a. The protrusions 32 are arranged, for example, at lattice points of a square lattice in plan view. The protrusions 32 have the same configuration as the resin material 12 in the first embodiment.

[0054] Other configurations are substantially the same as those of the first embodiment. The third embodiment can also achieve the same effects as those of the first embodiment.

[0055] The resin material 36 of the tactile panel 103 included in the third embodiment can be formed by, for example, injection molding using a mold.

[0056] The arrangement of the protrusions is not limited to that shown in Fig. 7. For example, in the first embodiment, the resin material 12 may be arranged at the lattice points of an equilateral triangular lattice in plan view, as shown in Fig. 15. The same applies to the second portion 22 in the second embodiment and the protrusions 32 in the third embodiment.

[0057] Aspects of the present disclosure are, for example, as follows.

[0058] <1> a panel having a base portion having a first main surface and a second main surface opposite to the first main surface, and a plurality of protrusions provided on the second main surface; a piezoelectric actuator disposed on the first main surface and configured to generate vibrations; a display unit facing the first main surface; and The diameter of the convex portion in a plan view is 0.05 mm or more and 3 mm or less, The height of the convex portion is 5 μm or more and 50 μm or less, The pitch of the convex portions is 0.5 mm or more and 5 mm or less, A display device, wherein a ratio of a diameter of the convex portion to a height of the convex portion is 5 or more and 200 or less.

[0059] <2> the base includes a glass material having the first major surface; The protrusion includes a resin material. <1> The display device according to claim 1.

[0060] <3> The panel comprises: a glass material having the first main surface and a third main surface opposite the first main surface; a resin film provided on the third main surface; and The resin film is a first portion having the second major surface; a plurality of second portions provided on the second main surface; and the base is configured from the glass material and the first part, The convex portion is formed from the second portion. <1> The display device according to claim 1.

[0061] <4> The panel includes a resin material having the base and the protrusion. <1> The display device according to claim 1. [Explanation of symbols]

[0062] 11, 25: Glass material 11a, 21a, 31a: 2nd main surface 12, 26, 36: Resin material 21, 31: Base 22: Part 2 25a: Third main surface 27: Part 1 32: Convex 100:Display device 101: Display panel 102: Touch panel 103: Tactile panel 103c: 1st principal surface 104: Piezoelectric actuator

Claims

1. a panel having a base portion having a first main surface and a second main surface opposite to the first main surface, and a plurality of protrusions provided on the second main surface; a piezoelectric actuator disposed on the first main surface and configured to generate vibrations; a display unit facing the first main surface; and The diameter of the convex portion in a plan view is 0.05 mm or more and 3 mm or less, The height of the convex portion is 5 μm or more and 50 μm or less, The pitch of the convex portions is 0.5 mm or more and 5 mm or less, A display device, wherein a ratio of a diameter of the convex portion to a height of the convex portion is 5 or more and 200 or less.

2. the base includes a glass material having the first major surface; The display device according to claim 1 , wherein the protrusions are made of a resin material.

3. The panel comprises: a glass material having the first major surface and a third major surface opposite the first major surface; a resin film provided on the third main surface; and The resin film is a first portion having the second major surface; a plurality of second portions provided on the second main surface; and the glass material and the first part constitute the base, The display device according to claim 1 , wherein the second portion constitutes the convex portion.

4. The display device according to claim 1 , wherein the panel is made of a resin material and includes the base and the protrusions.

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