Display device

Abstract

A display device according to the present disclosure comprises: a thin plate-shaped display cell; a vibrator that is disposed on the back surface side of the display cell and vibrates the display cell; a rigid member that is disposed facing the display cell with a gap therebetween and supports the vibrator; at least one cushion member that is provided between the rigid member and the display cell and fixed to the rigid member; and a fixing member that fixes the display cell to the rigid member and is provided along an outer peripheral part of the display cell with respect to the vibrator. The cushion member is provided, on a surface of the rigid member, along a line extending from the position of the vibrator toward the fixing member.

Description

display device

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

[0002] In recent years, displays have become generally thin and lightweight. Speakers mounted on displays are also required to be thin and lightweight, and it has been proposed to use flat panel speakers with flat vibrating surfaces instead of the usual cone-shaped speakers. Furthermore, when a flat panel speaker is mounted on a display, it has also been proposed to use the display panel of the display as the diaphragm of the flat panel speaker.

[0003] For example, Patent Document 1 discloses a configuration in which an actuator for a flat panel speaker is attached to a display panel that uses OLEDs (organic light emitting diodes). With this configuration, by driving the actuator with an audio signal, the display panel vibrates in response to the audio signal, giving the user the experience of sound being output from the screen.

[0004] International Publication No. 2019 / 131041

[0005] When a display panel with an actuator attached is used as a flat panel speaker, it is important to design and manage the distance between the display panel, which acts as a diaphragm, and the rear structure of the display panel, such as the rigid member to which the display panel is attached. In other words, this distance needs to be minimized to transfer heat generated by the display panel to the rigid member on the rear side. On the other hand, if this distance is too narrow, the display panel itself may vibrate and come into continuous strong contact with other members, such as the rear structure, generating abnormal noise and potentially impairing the user's experience of hearing sound being output from the screen.

[0006] Therefore, an object of the present disclosure is to provide a display device that allows a user to better enjoy the experience of sound being output from the screen when the display panel is used as a flat panel speaker.

[0007] The display device according to the present disclosure comprises a thin-plate-shaped display cell, a vibrator arranged on the rear side of the display cell and vibrating the display cell, a rigid member arranged opposite the display cell across a gap and supporting the vibrator, at least one cushion member fixedly attached to the rigid member between the rigid member and the display cell, and a fixing member arranged along the outer periphery of the display cell relative to the vibrator and fixing the display cell to the rigid member, wherein the cushion member is arranged on the surface of the rigid member according to a line centered on the position of the vibrator and directed toward the fixing member.

[0008] 1 is a schematic diagram showing a basic configuration of a display device having a structure for vibrating a display cell according to existing technology. FIG. 1 is a schematic diagram showing an example of a configuration in which a vibrator is attached to a display cell. FIG. 1 is a schematic diagram showing how a display cell undergoes planar vibration due to vibration of the vibrator. FIG. 1 is a schematic diagram for explaining the generation of abnormal noise due to warping of the display cell caused by a bimetal structure. FIG. 1 is a schematic diagram showing a configuration of an example of a display device according to an embodiment. FIG. 1 is a schematic diagram showing a cross section of an example of a display device 1 according to an embodiment. FIG. 1 is a schematic diagram showing an example of a case in which cushion members are arranged in a layout that intersects at right angles with lines extending radially from the vibrator as a center. FIG. 1 is a schematic diagram showing an example of a case in which cushion members are arranged in a layout along lines extending radially from the vibrator as a center, according to an embodiment. FIG. 1 is a schematic diagram for explaining the principle of wave superposition. FIG. 1 is a schematic diagram for explaining a difference in composite wave depending on the distance from a vibration source to a fixed end. FIG. 1 is a schematic diagram for explaining layout conditions of a cushion member according to an embodiment. FIG. 1 is a schematic diagram showing variations in layout of a cushion member according to a first modified example of an embodiment. FIG. 1 is a schematic diagram showing variations in shape of a cushion member according to a second modified example of an embodiment. 10A to 10C are schematic diagrams showing variations in the shape of the end portion of the cushion member according to a third modified example of the embodiment.

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following embodiments, the same components are denoted by the same reference numerals, and redundant description will be omitted.

[0010] Hereinafter, embodiments of the present disclosure will be described in the following order: 1. Overview of the present disclosure 2. Regarding existing technology 2-1. Overview of the configuration of a display device according to existing technology 2-2. Issues with existing technology 3. Regarding embodiments of the present disclosure 3-1. Regarding the configuration of a display device according to an embodiment 3-2. Regarding the layout of the cushion member 3-3. Regarding the selection of the thickness and hardness of the cushion member 3-4. Regarding the optimization of the layout of the cushion member 4. Regarding a first modified embodiment of the embodiment of the present disclosure 5. Regarding a second modified embodiment of the embodiment of the present disclosure 6. Regarding a third modified embodiment of the embodiment of the present disclosure

[0011] (1. Overview of the Present Disclosure) First, a general description of the technology according to the present disclosure will be given. The present disclosure relates to a display device that uses a thin display cell as a display device for displaying images. The display device according to the present disclosure has a vibrator that vibrates in response to an audio signal attached to the back side of the display cell, causing the display cell to vibrate, and the display cell can also be used as a speaker. By using this display device, a user can experience sound coming from the screen.

[0012] In this configuration, the present disclosure arranges multiple cushion members radially around the vibrator between the display cell and the back chassis assembly on the rear side of the display cell to which the vibrator is fixed. This configuration maintains an appropriate air layer thickness between the display cell and the back chassis assembly and prevents abnormal noise caused by vibration of the display cell by the vibrator. Furthermore, arranging multiple cushion members radially around the vibrator reduces interference with vibration waves from the vibrator due to reflected waves from the cushion members, thereby achieving higher sound quality.

[0013] (2. Existing Technology) Next, existing technology related to the technology of the present disclosure will be described.

[0014] (2-1. Overview of the Configuration of a Display Device According to Existing Technology) Fig. 1 is a schematic diagram showing the basic configuration of a display device according to existing technology, which has a structure for vibrating a display cell. Note that, for the sake of explanation, Fig. 1 omits the display cell in a display device 1000.

[0015] 1, the display device 1000 includes a fixing member 1010, a back chassis assembly 1020, and vibrators 100L and 100R. The fixing member 1010 is a member for fixing a display cell (not shown) to the back chassis assembly 1020, and may be made of, for example, double-sided tape. Note that the back chassis assembly 1020 may actually have a size that reaches from the bottom end of the figure to the top end of the fixing member 1010.

[0016] The back chassis assembly 1020 includes a metal back chassis and an inner plate having a metal layer, and the inner plate and the display cell are positioned opposite each other. In the following description of the display device 1000, the display surface side of the display cell will be referred to as the front side, and the side of the back chassis assembly 1020 facing the display cell will be referred to as the back side.

[0017] The vibration exciters 100L and 100R are configured to vibrate in response to, for example, an L (left) channel audio signal and an R (right) channel audio signal, respectively. One end of each of the vibration exciters 100L and 100R is fixed to the back chassis assembly 1020, and the other end is attached to the display cell. The vibration exciters 100L and 100R and the display cell to which the vibration exciters 100L and 100R are attached form a flat panel speaker.

[0018] In the configuration of FIG. 1, the display device 1000 may be provided with a subwoofer 1030 on the rear side of the back chassis assembly 1020, for example.

[0019] In the following description, when there is no need to particularly distinguish between the vibration exciters 100L and 100R, they will be referred to as the vibration exciter 100.

[0020] 2 is a schematic diagram showing an example of a configuration in which the vibration exciter 100 is attached to a display cell 200. FIG. 2 shows the vibration exciter 100 and its surrounding configuration as a cross section taken in a direction perpendicular to the display cell 200.

[0021] One end of the vibrator 100 is fixed to a fixing member 111 and a base 112, and the base 112 is fixed to the inner plate 110 by a vibrator fixing structure 113 such as a STUD. That is, one end of the vibrator 100 is fixed to the inner plate 110 via the fixing member 111, the base 112, and the vibrator fixing structure 113. The other end of the vibrator 100 is attached to the display cell 200 by a vibration transmission member 120 such as an adhesive.

[0022] In this configuration, when a current based on an audio signal is applied to the vibrator 100, the vibrator 100 vibrates up and down in the figure with the base 112 as the reference, and the vibration is transmitted to the display cell 200 via the vibration transmission member 120. The display cell 200 vibrates in a planar manner in response to this vibration.

[0023] The vibration exciter 100 is not limited to the above-described structure using a voice coil, a bobbin, and a magnetic circuit. For example, the vibration exciter 100 may be configured based on a structure that generates vibrations using capacitance or a structure that generates vibrations using a piezoelectric element.

[0024] FIG. 3 is a schematic diagram showing how the display cell 200 vibrates in a plane due to the vibrations of the vibrators 100L and 100R. FIG. 3 shows the display cell 200 as viewed from the left. Also, in FIG. 3, ripples due to the vibrations are indicated by shades of color. As shown in FIG. 3, ripples 500L and 500R due to the vibrations of the vibrators 100L and 100R are generated at positions on the display cell 200 corresponding to the positions of the vibrators 100L and 100R, respectively. In the example of FIG. 3, ripples 500SW due to the vibrations of the subwoofer 1030 (see FIG. 1) are also generated corresponding to the position of the subwoofer 1030.

[0025] (2-2. Issues in Existing Technology) Here, issues in the existing technology relating to the configuration in which the vibrator 100 is attached to the display cell 200 to vibrate the display cell 200 will be described.

[0026] (First Problem) First, the first problem in the existing technology will be described. In the above-mentioned Fig. 2, the thickness Z indicates the air gap between the display cell 200, which serves as a vibration plate, and the inner plate 110, which is a rigid member to which the display cell 200 is attached, when the vibrator 100 is attached to the display cell 200. By attaching the vibrator 100, which serves as a vibration source, to the display cell 200 and vibrating the display cell 200 itself, a speaker function in which sound is emitted from the display cell 200 is realized.

[0027] In such a structure, the display cell 200 itself vibrates, so the design and management of the thickness Z of this air gap are extremely important. This is mainly due to the following three reasons: (1) To transfer the self-heat generated by the display cell 200 to the rigid member (inner plate 110) on the rear side, it is necessary to minimize the distance between the display cell 200 and the rigid member. (2) To properly propagate the vibrations received by the vibrator 100 to the entire vibrated area of ​​the display cell 200, it is necessary to ensure an appropriate thickness for the air layer. (3) When the vibrating display cell 200 itself comes into strong continuous contact with another member, such as a fixed member, due to the vibrations, an abnormal noise (called a "rumble noise") is generated. To prevent this abnormal noise, it is necessary to ensure an appropriate spatial distance.

[0028] Reason (1) and reasons (2) and (3) are contradictory objectives. Therefore, it is extremely important to design an appropriate distance to satisfy these objectives, and to develop and design a structure that can ensure the appropriate distance in actual mass-produced parts, taking into account the user's usage environment. This is the first challenge.

[0029] (Second Problem) Next, the second problem with the existing technology will be described. In recent display devices, in order to achieve a thin structure, different materials are used for the display cell 200 and the fixing member themselves. However, in order to ensure rigidity while reducing the overall thickness, a structure that suppresses slippage between different materials (for example, metal and resin) is sometimes adopted. To achieve this, a bimetal structure is often adopted in which the different materials are firmly fixed together using adhesives, screws, etc. Examples of bimetal structures include the following.

[0030] (1) The display cell 200 itself, with a glass substrate or the like on which the TFTs (Thin Film Transistors) in the display cell 200 are formed as the central layer, a polarizing plate made of resin attached to the surface, and a metal material attached to the back surface for the purposes of rigidity and sealing. An example of a display cell 200 having such a structure is an OLED cell that uses an OLED (Organic Light Emitting Diode) as the light-emitting element. (2) A structure in which, for example, aluminum is used as rigid member A and iron is used as rigid member B for functional reasons such as ensuring rigidity, heat transfer, and weight reduction in the configuration within the rigid member assembly (e.g., back chassis assembly) to which the display cell 200 is attached.

[0031] In such a bimetal structure, two types of metal plates or dissimilar materials with different thermal expansion coefficients are bonded together. Therefore, the amount of expansion and contraction of each bonded member changes between high and low temperatures, causing the entire display cell 200 to warp significantly. This warping of the entire display cell 200 causes the display cell 200 and the back chassis assembly to come into contact with each other. When the display cell 200 is vibrated by the vibrator 100, the display cell 200 and the back chassis assembly repeatedly come into contact and separate, which may result in the generation of abnormal noise. This abnormal noise may impair the user's experience of sound being output from the screen.

[0032] 4 is a schematic diagram for explaining the generation of abnormal noise due to warping of the display cell 200 caused by the bimetal structure. Section (a) of Fig. 4 shows an example of the state of the display cell 200 at normal temperature, and section (b) shows an example of the state of the display cell 200 at high temperature.

[0033] As shown in FIG. 4, the display cell 200 is fixed to a rigid member, for example, an inner plate 110 , via a fixing member 310 , and the inner plate 110 is further fixed to a rigid member 312 by a fixing member 311 .

[0034] As shown in section (a) of Fig. 4, at normal temperatures, the display cell 200 maintains a flat state. When driven, the display cell 200 generates heat and becomes higher than the normal temperature. As shown in section (b) of Fig. 4, at high temperatures, the bimetal structure causes an elongation force to act on the display cell 200, as indicated by arrow 330 in the figure, causing the display cell 200 to become warped.

[0035] 4, as indicated by arrow 340 in the figure, the distance between the display cell 200 and the inner plate 110 decreases with increasing distance from the fixing member 310, and the display cell 200 and the inner plate 110 come into contact with each other at position A. When the display cell 200 is vibrated by the vibrator 100 in this state, the display cell 200 and the inner plate 110 repeatedly come into contact with and separate from each other in response to the vibrations, which causes abnormal noise.

[0036] This warping of the display cell 200 caused by the bimetal structure is a second problem.

[0037] 4 shows a case where abnormal noise is generated due to warping of the display cell 200 caused by heat, but the cause of abnormal noise caused by heat is not limited to warping of the display cell 200. For example, if the inner plate 110 or the rigid member 312 is configured by combining different materials with different thermal expansion coefficients, it is possible that the inner plate 110 or the rigid member 312 will warp due to heat. Even in this case, repeated contact and separation between the inner plate 110 and the display cell 200, or between the inner plate 110 and the rigid member 312 due to vibration, can cause abnormal noise.

[0038] (Third Problem) Next, the third problem in the existing technology will be described. In recent years, display devices have been required to be not only thin and lightweight, but also large, and furthermore, to be able to provide users with an immersive feeling in which images and sound are integrated. To meet this demand, a mechanism and sound adjustment technology are required that can position a sound image generated by a speaker provided on the display device at an appropriate position within the screen of the display device and that can express a sound spread that exceeds the size of the display cell 200 on the display device. Controlling the sound emitted from the display device is the third problem.

[0039] That is, due to the second problem, in a bimetal structure that tends to be adopted to realize a thin and lightweight display device, depending on the user's usage environment of the display device, as described above, fluctuations in the temperature of the display cell 200 may cause warping of one or both of the display cell 200, the inner plate 110, and the rigid member 312. The difference in warping between the components due to this warping of the display cell 200 may change the designed air gap, and there is a risk that the components may come into contact with each other.

[0040] On the other hand, in a flat panel speaker structure for achieving a thin and lightweight design due to the first issue, it is required to realize a structure that can ensure an appropriate distance between the display cell 200, which is a diaphragm, and a rigid member in order to suppress abnormal noise (rumble) that occurs when the display cell 200, which is a diaphragm, repeatedly comes into strong contact with other rigid members such as the inner plate 110. Furthermore, in order to maximize the user's immersive experience in images and sound while solving these first and second issues, it is required to realize a structure that constitutes a high-quality flat panel speaker that can solve the third issue.

[0041] In the following description, continuous contact of the display cell 200 or the like with another rigid member will be referred to as continuous contact, where appropriate.

[0042] (3. Regarding Embodiments of the Present Disclosure) Next, embodiments of the present disclosure will be described.

[0043] (3-1. Configuration of the display device according to the embodiment) Fig. 5 is a schematic diagram showing the configuration of an example of a display device according to the embodiment. Note that Fig. 5 shows the display device 1 as viewed from the display surface side, and for the sake of explanation, the display cell 200 in the display device 1 is omitted.

[0044] 5, the display device 1 according to the embodiment includes a fixing member 40, a back chassis assembly 50, an exterior component 60, and vibration exciters 100L and 100R, similar to the display device 1000 according to the existing technology described with reference to FIG. 1. The fixing member 40 is provided along the outer periphery to hold the display cell 200. The vibration exciters 100L and 100R are actuators that are driven to vibrate by audio signals. The vibration exciters 100L and 100R are fixed to the back chassis assembly 50 near the center of the area surrounded by the fixing member 40. In other words, the fixing member 40 is provided as a frame for each of the vibration exciters 100L and 100R. The fixing member 40 may be a partition structure against vibrations caused by the vibration exciters 100L and 100R.

[0045] 5, components that are less relevant to the embodiment, such as a subwoofer, are omitted as appropriate. In the following description, when there is no need to particularly distinguish between the vibration exciters 100L and 100R, they will be referred to as the vibration exciter 100.

[0046] The display device 1 according to the embodiment further includes a plurality of cushion members 20 between the display cell 200 and the back chassis assembly 50. In the example of Fig. 5, each of the cushion members 20 is arranged along a line 70 that extends radially at predetermined angular intervals from the vibrator 100. As will be described in detail later, each of the cushion members 20 is fixed to the back chassis assembly 50 and is provided so as to be able to press the display cell 200.

[0047] As described above, the display device 1 according to the embodiment has a structure in which a plurality of cushion members 20 are provided between the display cell 200 and the back chassis assembly 50. With this structure, even if different warping occurs between the components of the bimetal display cell 200 due to temperature rises and falls in the user's usage environment, the display device 1 can maintain an appropriate distance between the display cell 200 and the back chassis assembly 50, which is a rigid member, by the plurality of cushion members 20.

[0048] That is, the display device 1 according to the embodiment can ensure an appropriate thickness Z of the air layer 30 between the display cell 200 and the inner plate (back chassis assembly 50) as described with reference to Fig. 2 by using the multiple cushion members 20, thereby suppressing the generation of abnormal noise (rumble) caused by contact between the display cell 200 and the back chassis assembly 50. This solves the first and second problems described above.

[0049] Furthermore, in the display device 1 according to the embodiment, the multiple cushion members 20 are arranged radially around the vibrator 100. This prevents the cushion members 20 from interfering with the propagation of vibrations (sound) that spread radially from the vibration source (vibrator 100) toward the outside of the screen. Furthermore, by arranging the multiple cushion members 20 radially around the vibrator 100, it is possible to obtain the effect of suppressing the mixing of vibrations reflected from the edge (fixing member 40) of the display cell 200. This allows the sound corresponding to the vibration of the vibrator 100 to be propagated clearly, improving the sound quality and solving the third problem described above.

[0050] In the above description, the display device 1 according to the embodiment has been described as having a structure provided with a plurality of cushion members 20, but this is not limited to this example. That is, the display device 1 may have only one cushion member 20 as long as it is possible to ensure an appropriate thickness Z of the air layer 30 between the display cell 200 and the inner plate.

[0051] 5, the display device 1 is shown as including two vibration exciters 100L and 100R, but the number of vibration exciters 100 included in the display device 1 is not limited to two. That is, the display device 1 may include only one vibration exciter 100, or may include three or more vibration exciters 100. Even if the display device 1 includes a number other than two vibration exciters 100, the cushion member 20 and the fixing member 40 may be provided around each vibration exciter 100.

[0052] The structure of the display device 1 shown in Fig. 5 will be described in more detail. In Fig. 5, a fixing member 40 is a member for fixing a display cell (not shown) to the back chassis assembly 50, and may be, for example, double-sided tape. The fixing member 40 includes an outer peripheral portion along the outer periphery of the display cell 200, for example, and a vertical portion provided vertically in the center of the display cell 200. The vertical portion maintains the thickness of the air layer between the display cell 200 and the back chassis assembly 50, and also has the function of separating the vibrations of the display cell 200 caused by the vibrator 100L from the vibrations of the vibrator 100R.

[0053] As will be described in detail later, the back chassis assembly 50 may be a rigid member including a metal back chassis and an inner plate having a metal layer. The back chassis assembly 50 is not limited to this, and may be configured by stacking two metal back chassis together, or may be configured by a single non-metallic or metallic rigid member. Furthermore, the back chassis assembly 50 may be configured by combining rigid members. The back chassis assembly 50 actually has a size that extends from the bottom edge of the figure to the top edge of the fixing member 40. The exterior component 60 is, for example, a component that configures the exterior of the display device 1.

[0054] The vibration exciters 100L and 100R are configured to vibrate in response to, for example, an L (left) channel audio signal and an R (right) channel audio signal, respectively. The structure of the vibration exciters 100L and 100R can be the same as that described with reference to Fig. 2, so a description thereof will be omitted here. The vibration exciters 100L and 100R are each provided at or near the center of the area surrounded by the fixing member 40, with one end fixed to the back chassis assembly 50 and the other end attached to the display cell.

[0055] Each of the vibrators 100L and 100R includes, for example, a voice coil, a bobbin around which the voice coil is wound, and a magnetic circuit. For example, when an audio current (an electric signal) flows through the voice coil, a driving force is generated in the voice coil according to the principle of electromagnetic action. This driving force is transmitted to the display cell 200, which serves as a diaphragm to which the vibrators 100L and 100R are attached. Vibrations corresponding to changes in the audio current are converted into air vibrations, generating sound pressure. In this way, the vibrators 100L and 100R and the display cell 200 to which the vibrators 100L and 100R are attached constitute a flat panel speaker.

[0056] FIG. 6 is a schematic diagram showing a cross section of an example of a display device 1 according to an embodiment. In FIG. 6, a back chassis assembly 150 (corresponding to the back chassis assembly 50 in FIG. 5) is configured by fixing an inner plate 110 and a back chassis 152 with a fixing member 151. The fixing member 151 may be a fixing member such as an adhesive or a screw. The inner plate 110 may have a structure in which a metal such as aluminum and a resin are laminated. Furthermore, the back chassis 152 may be a metal plate or a plate-shaped non-metallic material. Furthermore, the back chassis assembly 150 may be configured with a single component.

[0057] The back chassis assembly 150 has a function of maintaining the overall rigidity of the display device 1. The back chassis assembly 150 also has a function of mounting a board on which a circuit for controlling the display of the display device 1 is mounted, and other design components.

[0058] One end of the vibrator 100 is fixed to a fixing member 111 and a base 112, and the base 112 is fixed to the inner plate 110 by a vibrator fixing structure (not shown). That is, one end of the vibrator 100 is fixed to the inner plate 110 via the fixing member 111, the base 112, and the vibrator fixing structure. The other end of the vibrator 100 is attached to the display cell 200 by a vibration transmission member 120. The vibration transmission member 120 uses an adhesive, an aluminum sheet, or the like, and functions to appropriately transmit vibrations generated by the vibrator 100 to the display cell 200, as well as to transfer heat and maintain the adhesion of the vibrator 100. The vibrator 100 generates vibrations relative to the back chassis assembly 150. The vibrations generated by the vibrator 100 are transmitted to the display cell 200 via the vibration transmission member 120.

[0059] A display device using, for example, an OLED as a display element may be applied to the display cell 200. The display cell 200 is fixed to the back chassis assembly 150, which serves as a rigid member, by a fixing member 140 (corresponding to the fixing member 40 in FIG. 5 ). In practice, the display cell 200 is fixed by the fixing member 140 to the inner plate 110, which is closest to the display cell 200 in the back chassis assembly 150.

[0060] The cushion member 20 has the function of maintaining an air layer 30 between the display cell 200 and the back chassis assembly 150 at a location between the fixing member 140 provided at the outer edge or center of the display cell 200 and the vibrator 100 .

[0061] As described above, the cushion member 20 has an adhesive or the like on one surface thereof and is fixed to the back chassis assembly 150 (inner plate 110) (referred to as the fixed surface). The surface of the cushion member 20 opposite the fixed surface is not fixed to the display cell 200 but is capable of pressing the display cell 200. For example, the cushion member 20 is made of a material that absorbs vibrations and has a predetermined elasticity. For example, a sponge material, polyurethane, or the like may be used as the material for the cushion member 20. Furthermore, it is preferable that the cushion member 20 has a thickness that is slightly thicker than the thickness of the air layer 30. The thickness of the cushion member 20 may be any thickness that can maintain an appropriate spatial distance between the display cell 200 and the inner plate 110, and may be thinner than the thickness of the air layer 30, for example. Note that, hereinafter, the surface of the cushion member 20 opposite the fixed surface is referred to as the pressing surface.

[0062] The material of the cushion member 20 is not limited to sponge material or polyurethane. For example, the cushion member 20 may be made of wood or paper.

[0063] (3-2. Layout of cushion member) As explained using FIG. 5, the cushion member 20 according to the embodiment is arranged in a layout such that the propagation of vibrations (waves) generated radially outward from the vibration source, the vibrator 100, is reflected by the cushion member 20 itself and the reflected waves do not interfere with each other, impairing the sound quality.

[0064] The difference in vibration propagation due to differences in the layout of the cushion member will be described using Figures 7 and 8. In Figures 7 and 8, waves (ripples) caused by the vibration of the display cell 200 in response to the vibration of the vibrator 100 are indicated by different color intensities.

[0065] Fig. 7 is a schematic diagram showing an example of a layout in which cushion members 20 are arranged so as to intersect at right angles with lines extending radially from the vibration exciter 100. According to the layout of Fig. 7, the cushion members 20 themselves reflect the vibrations radially generated from the vibration exciter 100 back toward the vibration exciter 100. As a result, the vibrations continuously generated from the vibration exciter 100 and propagating outward mix with the vibrations reflected by the cushion members 20, deteriorating the sound quality.

[0066] Fig. 8 is a schematic diagram showing an example of a layout in which cushion members 20 according to an embodiment are arranged along lines extending radially from the vibrator 100. The layout in Fig. 8 suppresses reflection by the cushion members 20 of vibrations generated radially from the vibrator 100. This prevents vibrations continuously generated by the vibrator 100 and propagating outward from mixing with vibrations reflected by the cushion members 20, thereby achieving clearer sound quality.

[0067] (3-3. Selection of Thickness and Hardness of Cushion Member) Next, selection of the thickness and hardness of the cushion member 20 according to the embodiment will be described.

[0068] As described above, the cushion member 20 needs to press or come into contact with the display cell 200 when the spatial distance between the display cell 200 and the inner plate 110 is narrowed, and also needs to be able to absorb vibrations of the display cell 200 caused by the vibration of the vibrator 100. Therefore, by selecting the cushion member 20 that has a hardness equal to or less than that of the fixing member 140 and a thickness greater than that of the air layer 30, the function of ensuring a desired spatial distance between the display cell 200 and the back chassis assembly 150 can be realized.

[0069] If a cushion member 20 harder than the fixing member 140 is used, the vibrations generated by the vibrator 100 will be directly transmitted to the display cell 200, causing the display cell 200 itself to vibrate strongly. This will cause the cushion member 20 and the display cell 200 to come into continuous contact with each other in response to the vibrations of the vibrator 100, resulting in the generation of abnormal noise (rumble). Therefore, it is necessary to select a cushion member 20 with a hardness equal to or less than that of the fixing member 140. Furthermore, since the cushion member 20 is thus selected to have a hardness equal to or less than that of the fixing member 140, it is preferable to select a cushion member 20 with a thickness slightly thicker than that of the air layer 30 in order to ensure the spatial distance of the air layer 30. However, the cushion member 20 may be thinner than the air layer 30, as long as the thickness is sufficient to prevent abnormal noise caused by repeated, continuous, strong contact between the display cell 200 and other rigid members, such as the inner plate 110, due to vibrations.

[0070] By selecting the cushion member 20 with such hardness and thickness, it becomes possible to maintain an appropriate spatial distance in response to the warpage difference of the components caused by the bimetal structure of the display cell 200. It is also possible to suppress the generation of abnormal noise caused by continuous contact between the cushion member 20 and the display cell 200 in response to the vibration of the vibrator 100. Furthermore, by using the cushion member 20, it is possible to maintain the spatial distance of the air layer 30, which makes it possible to increase the vibration of the vibrator 100, thereby contributing to an improvement in sound pressure.

[0071] (3-4. Optimization of Layout of Cushion Member) Next, optimization of the layout of the cushion member 20 according to the embodiment will be described.

[0072] First, the appropriate distance between the cushion member 20 and the fixing member 40 as the outer peripheral member that minimizes the influence of screen distortion will be described. It is necessary to ensure an appropriate distance between the cushion member 20 and the fixing member 40, taking into consideration the influence of distortion on the display cell 200. That is, if the cushion member 20 is thicker than the fixing member 40 and the distance between the cushion member 20 and the fixing member 40 is shorter than the appropriate distance, the difference in thickness between the cushion member 20 and the fixing member 40 will cause the display cell 200 to receive a reaction force from the fixing member 40 or the cushion member 20, which could result in distortion of the screen created by the display cell 200. If distortion occurs in the screen created by the display cell 200, the display surface that displays images to the user will not be able to be a clean, flat surface.

[0073] In addition, it is necessary to optimize the distance between the cushion member 20 and other components (fixed member 40) so that abnormal noise is not generated by waves generated by the vibration of the vibrator 100 or waves reflected from the fixed member 40. Furthermore, in consideration of the influence of the amplitude of the vibration waves generated by the vibration of the vibrator 100 or the vibration waves reflected from the fixed member 40, it is necessary to properly secure the distance between the cushion member 20 and the corresponding vibrator 100 and the fixed member 40.

[0074] This is because at points on the display cell 200 close to the vibrator 100, the vibration waves propagating from the vibrator 100 are large, and there is a risk that abnormal noise will be generated due to vibrating contact between the cushion member 20 and the display cell 200.

[0075] Furthermore, at points where the distance from the fixing member 40 to the display cell 200 is different, the vibration waves reflected from the fixing member 40 are large, and therefore, due to the principle of wave superposition, the vibration on the display cell 200 side becomes large. As a result, continuous contact due to vibration between the display cell 200 and the cushion member 20 becomes severe, which may result in the generation of abnormal noise.

[0076] The principle of wave superposition will be briefly explained with reference to FIGS. 9, 10A and 10B.

[0077] FIG. 9 is a schematic diagram illustrating the principle of wave superposition. In FIG. 9, the passage of time is represented from top to bottom, and the horizontal direction represents position. In FIG. 9, wave w1 travels from left to right, and wave w2 travels from right to left. When wave w1 and wave w2 approach each other over time and overlap, a composite wave of wave w1 and wave w2 is generated. The amplitude y of the composite wave at a certain position is the sum of the amplitude y1 of wave w1 and the amplitude y2 of wave w2 at that position.

[0078] FIG. 10 is a schematic diagram illustrating the difference in composite waves depending on the distance from the vibration source to the fixed end. In sections (a) and (b) of FIG. 10, the passage of time is represented from top to bottom, and the horizontal direction represents position. In each of sections (a) and (b), both ends are fixed ends 400a and 400b, and the vibration source 401 is located at the midpoint between the fixed ends 400a and 400b. Section (a) shows an example where the distance between the vibration source 401 and each fixed end 400a and 400b is large, while section (b) shows an example where this distance is small.

[0079] In both section (a) and section (b) of Figure 10, the wave generated by the vibration of the vibration source 401 travels as a traveling wave, for example, toward the fixed end 400a, is reflected at the fixed end 400a, and returns toward the vibration source 401 as a reflected wave.

[0080] At this time, as in the example of section (a), if the distance from the vibration source 401 to the fixed end 400a is large, the traveling wave becomes a reflected wave after being sufficiently attenuated (amplitude level Lv a In the example of section (a), when the reflected wave reaches the vicinity of the vibration source 401, the composite wave has an amplitude level Lv b On the other hand, as in the example of section (b), when the distance from the vibration source 401 to the fixed end 400a is small, the amplitude of the traveling wave remains large and the reflected wave (>Lv a ), and the amplitude level of the composite wave when this reflected wave reaches the vicinity of the vibration source 401 is also larger than that in the example of section (a) (>Lv b ).

[0081] Therefore, when the distance from each cushion member 20 to the fixing member 40 or the distance from the vibration source (exciter 100) to each cushion member 20 is short, the amplitude of the composite wave, which is a combination of the forward wave and the reflected wave, increases due to the principle of wave superposition. This increases the amount of continuous contact of the display cell 200 with each cushion member 20, resulting in the generation of abnormal noise.

[0082] Therefore, the distance between each cushion member 20 and the fixing member 40, and the distance between the vibration source (exciter 100) and each cushion member 20 are affected by the amplitude and sound pressure emitted from the exciter 100, the hardness of the attachment surface of the display cell 200 to which the exciter 100 is attached, and the hardness and amplitude attenuation of the cushion member 20 and the peripheral fixing member 40, and can be defined individually.

[0083] (Layout Conditions of Cushion Member) Here, the layout conditions of the cushion member 20 according to the embodiment will be described. Fig. 11 is a schematic diagram for explaining the layout conditions of the cushion member 20 according to the embodiment. Note that the layout of the cushion member 20 shown in Fig. 11 is the same as that described using Fig. 5, and therefore description thereof will be omitted here.

[0084] First, the length of the cushion member 20 will be described. total is the shortest distance from the center of the vibrator 100 (center of the vibration source) to the fixed member 40 on the periphery, and the length L csn represents the length of the cushion member 20. In this case, the length L of the cushion member 20 csn It is preferable that the length L of the cushion member 20 satisfies the condition of the following formula (1). csn is the length of the cushion member 20 on the line 70 when the cushion member 20 is projected onto the corresponding line 70. csn / L total )<1 … (1)

[0085] Furthermore, the length L of the cushion member 20 csn It is more preferable that the condition of the following formula (2) is satisfied: 0.15<(L csn / L total) < 0.35 ... (2)

[0086] In reality, the length L of the cushion member 20 csn and the distance L from the center of the vibration source to the outer periphery total The relationship between the vibration exciter 100 and the cushion member 20 is difficult to uniquely determine, as it is also affected by the vibration of the exciter 100. Equation (1) expresses the intention of separating the cushion member 20 as far as possible from the vibration source. In this case, it is preferable to arrange each cushion member 20 so that the distance between the exciter 100 and the end of the cushion member 20 on the exciter 100 side is equal. Equation (2) is a relationship obtained experimentally.

[0087] Next, we will explain the angle of each cushion member 20. In Fig. 11, angle θ indicates the angle between the first cushion member 20 and the second cushion member 20, with the center of the vibration source (the center of the vibrator 100) as the apex of the angle. In this case, the first cushion member 20 and the second cushion member 20 are two cushion members 20 adjacent to each other, in other words, two cushion members 20 with no other cushion member 20 sandwiched between them.

[0088] It is preferable that the angle α satisfies the condition of the following formula (3): 0°<α≦180° (3)

[0089] Furthermore, it is more preferable that the angle α satisfies the condition of the following formula (4): 30°<α<50° (4)

[0090] For example, consider a plurality of lines 70 (not shown) that extend radially from the center of the vibrator 100 and satisfy the above-mentioned formula (3) or (4). Each cushion member 20 is arranged according to each of the plurality of lines 70.

[0091] From equation (3), it can be seen that only two cushion members 20 are sufficient. On the other hand, if there are too many cushion members 20, reflections from the ends of each cushion member 20 on the vibrator 100 side and reflections between the cushion members 20 may cause abnormal noise or deterioration of sound quality. By applying the angle restriction according to equation (4), the number of cushion members 20 can be limited.

[0092] It is desirable that the cushion members 20 are arranged evenly around the vibrator 100. In this case, the angles α (angular intervals) of the cushion members 20 do not necessarily have to be the same.

[0093] In the above description, the display cell 200 is described as a display device using OLEDs as light-emitting elements, but this is not limited to this example. For example, other types of display devices can be applied as the display cell 200 as long as they are thin, self-luminous display devices. Furthermore, depending on the structure of the backlight, etc., it is also possible to apply an LCD (Liquid Crystal Display) as the display cell 200.

[0094] 5, two vibrators 100L and 100R are provided for the display cell 200, symmetrically with respect to the center of the screen of the display cell 200, but this is not limited to this example. The number of vibrators 100 provided for the display cell 200 may be one, or three or more.

[0095] Patent Document 1 discloses that the vibrating unit located on the back side of the panel is installed by providing holes in the sound spread adjustment layer, and that standing waves are reduced by shaping the fixing material on the outer edge of the panel. However, Patent Document 1 does not disclose a technology for clearly propagating sound spread by arranging cushioning members radially from the sound vibration source, and does not solve the third problem mentioned above. Furthermore, Patent Document 1 does not disclose the problem of abnormal noise caused by strong, continuous contact between components due to warping of the components in a bimetal structure, and does not solve the first and second problems mentioned above.

[0096] (4. First Modification of the Embodiment of the Present Disclosure) Next, a first modification of the embodiment of the present disclosure will be described. The first modification of the embodiment relates to a variation in the layout of the cushion members 20. That is, in the example of FIG. 5 described above, eight cushion members 20 are arranged at equal angular intervals a predetermined distance from the vibrator 100, but the layout of the cushion members 20 is not limited to this example.

[0097] FIG. 12 is a schematic diagram showing variations in layout of the cushion member 20 according to the first modified example of the embodiment.

[0098] Section (a) of Fig. 12 shows an example in which a plurality of lines 70 extending radially at predetermined angular intervals from the vibrator 100 are provided parallel to the vertical and horizontal sides of the fixing member 40. In the example of section (a), the cushion members 20 are arranged in a cross layout along each of the plurality of lines 70.

[0099] Section (b) of Fig. 12 shows an example in which the multiple lines 70 are provided diagonally with respect to each of the vertical and horizontal sides of the fixing member 40. In other words, section (b) is an example in which the multiple lines 70 are provided on the diagonal lines of the rectangle formed by the fixing member 40. In the example of section (b), the cushion members 20 are arranged in an X-shaped layout along each of the multiple lines 70.

[0100] Sections (c) and (d) of Fig. 12 each show an example in which pairs of adjacent cushion members 20, which are spaced apart from each other so that they increase in distance toward the fixed member 40, are provided along each of the multiple lines 70. In this case, the ends of the pairs of adjacent cushion members 20 on the vibrator 100 side may be brought into contact with each other.

[0101] Section (c) of Fig. 12 shows an example in which, similar to the example in section (a) of the same figure, a plurality of lines 70 extending radially at predetermined angular intervals from the vibrator 100 as the center are provided parallel to each of the vertical and horizontal sides of the fixing member 40. Section (d) of Fig. 12 shows an example in which, similar to the example in section (b) of the same figure, the plurality of lines 70 are provided obliquely to each of the vertical and horizontal sides of the fixing member 40.

[0102] 12 have different layouts, it is thought that the state of reflection of the vibration of the vibrator 100 and the state of reflection between the cushion members will differ for each cushion member. Therefore, it is desirable to select an appropriate shape depending on the amount of vibration caused by the vibrator 100, the size of the outer frame formed by the fixing member 40, the thickness of the air layer 30 between the display cell 200 and the back chassis assembly 150, etc.

[0103] (5. Second Modification of the Embodiment of the Present Disclosure) Next, a second modification of the embodiment of the present disclosure will be described. The second modification of the embodiment relates to variations in the shape of the cushion members 20. That is, in the example of FIG. 5 described above, each cushion member 20 has a linear shape, but the shape of the cushion members 20 is not limited to this example.

[0104] Fig. 13 is a schematic diagram showing variations in the shape of the cushion member 20 according to a second modified example of the embodiment. Note that in the example of Fig. 13, in each of sections (a) to (d), a plurality of lines 70 are shown as being arranged parallel to each of the vertical and horizontal sides of the fixing member 40, similar to sections (a) and (c) of Fig. 12. Each of the examples of sections (a) to (d) of Fig. 13 can also be applied to the case where the plurality of lines 70 are arranged diagonally with respect to each of the vertical and horizontal sides of the fixing member 40, similar to sections (b) and (d) of Fig. 12.

[0105] Section (a) of Fig. 13 shows an example of cushion member 20a having a rod-like shape that curves convexly toward vibrator 100, with each vertex of the convexity being positioned along each of the multiple lines 70. Section (b) of Fig. 13 shows an example of rod-like cushion member 20b that snakes along each of the multiple lines 70. Section (c) of Fig. 13 shows an example of cushion member 20c having a shape that convexly toward vibrator 100 with the other end closed, with each vertex of the convexity being positioned along each of the multiple lines 70. Section (d) of Fig. 13 shows an example of cushion member 20d having an isosceles triangle shape with each vertex angle being positioned along each of the multiple lines 70.

[0106] 13 have different shapes, it is thought that the state of reflection of the vibration of the vibrator 100 and the state of reflection between the cushion members will differ for each cushion member. Therefore, it is desirable to select an appropriate shape depending on the amount of vibration caused by the vibrator 100, the size of the outer frame formed by the fixing member 40, the thickness of the air layer 30 between the display cell 200 and the back chassis assembly 150, etc.

[0107] (6. Third Modification of the Embodiment of the Present Disclosure) Next, a third modification of the embodiment of the present disclosure will be described. The third modification of the embodiment relates to variations in the shape of the end portions of the cushion members 20. That is, in the example of Fig. 5 described above, each cushion member 20 has a linear end portion, but the shape of the end portions of the cushion members 20 is not limited to this example.

[0108] FIG. 14 is a schematic diagram showing variations in the shape of the end portion of the cushion member 20 according to the third modified example of the embodiment.

[0109] Section (a) of Fig. 14 is an example of a cushion member 20f in which at least the end of the rod-shaped cushion member 20f facing the vibrator 100 (not shown) is flat, similar to the cushion member 20 shown in Fig. 5 described above. Section (b) of Fig. 14 is an example of a cushion member 20g in which at least the end of the rod-shaped cushion member 20f facing the vibrator 100 is curved and convex toward the vibrator 100. Section (c) of Fig. 14 is an example of a cushion member 20h in which at least the end of the rod-shaped cushion member 20f facing the vibrator 100 is spire-shaped, with its apex facing the vibrator 100.

[0110] Section (d) of Fig. 14 is an example of cushion member 20c, as described in section (c) of Fig. 13 above, which has a convex shape facing the vibrator 100 and a closed end, with each vertex of the convex shape being arranged according to each of the multiple lines 70. Section (e) of Fig. 14 is an example of cushion member 20d, as described in section (d) of Fig. 13 above, which has an equilateral triangular shape and each vertex angle being arranged according to each of the multiple lines 70.

[0111] 14 have different shapes at least at the end on the vibration exciter 100 side, and therefore, it is considered that the state of reflection of the vibration of the vibration exciter 100 also differs. Therefore, it is desirable to select an appropriate shape depending on the amount of vibration caused by the vibration exciter 100, the size of the outer frame formed by the fixing member 40, the thickness of the air layer 30 between the display cell 200 and the back chassis assembly 150, etc.

[0112] The effects described in this specification are merely examples and are not limiting, and other effects may also be present.

[0113] Note that the present technology can also be configured as follows: (1) A display device comprising: a thin-plate-shaped display cell; a vibrator arranged on the back side of the display cell and vibrating the display cell; a rigid member arranged opposite the display cell across a gap and supporting the vibrator; at least one cushion member provided between the rigid member and the display cell and fixed to the rigid member; and a fixing member provided on the vibrator along an outer periphery of the display cell to fix the display cell to the rigid member, wherein the cushion member is provided on a surface of the rigid member according to a line centered on the position of the vibrator and directed toward the fixing member. (2) The display device according to (1), comprising a plurality of the cushion members, wherein the plurality of cushion members are provided on a surface of the rigid member according to each of a plurality of lines radially centered on the position of the vibrator and directed toward the fixing member. (3) The display device according to (2), wherein the ratio of the length of any one of the cushion members when projected onto a line among the lines corresponding to the any one of the cushion members to the length from the position of the vibrator on the line to the fixing member is greater than 0.1 and less than 1. (4) The display device according to (3), wherein the ratio is greater than 0.15 and less than 0.35. (5) The display device according to (3) or (4), wherein a first cushion member and a second cushion member among the plurality of cushion members are provided corresponding to a first line and a second line among the plurality of lines, respectively, and an angle between the second line and the first line, with the position of the vibrator as a vertex, is greater than 0° and not more than 180°, and no other line among the plurality of lines is sandwiched between the second line and the first line. (6) The display device according to (5), wherein the angle is greater than 30° and less than 50°. (7) The display device according to any one of (1) to (6), wherein the cushion member is in pressable contact with the display cell. (8) The display device according to (7), wherein the cushion member is an elastic body having elasticity capable of maintaining a thickness determined as the gap when the display cell is pressed.(9) The display device according to any one of (1) to (8), wherein the line is arranged parallel to a vertical or horizontal direction of the fixing member. (10) The display device according to any one of (1) to (9), wherein the line is arranged obliquely to a vertical or horizontal direction of the fixing member. (11) The display device according to any one of (1) to (10), wherein the display device includes a plurality of the cushion members, and wherein pairs of adjacent cushion members among the plurality of cushion members arranged so that the spacing between them increases toward the fixing member are arranged according to the line. (12) The display device according to any one of (1) to (10), wherein the cushion member has a rod-like shape along the line, and wherein an end of the rod-like shape facing the vibrator is flat. (13) The display device according to any one of (1) to (10), wherein the cushion member has a rod-like shape along the line, and an end of the rod-like shape on the vibration exciter side has a curved shape that is convex toward the vibration exciter side. (14) The display device according to any one of (1) to (10), wherein the cushion member has a rod-like shape along the line, and an end of the rod-like shape on the vibration exciter side has a steeple shape with an apex on the vibration exciter side. (15) The display device according to any one of (1) to (10), wherein the cushion member has a rod-like shape that is curved in a convex shape toward the vibration exciter side, and the apex of the convexity is positioned corresponding to the line. (16) The display device according to any one of (1) to (10), wherein the cushion member has a serpentine shape along the line. (17) The display device according to any one of (1) to (10), wherein the cushion member has a shape that is convex toward the vibrator and closed at the other end, and an apex of the convexity is disposed along the line. (18) The display device according to any one of (1) to (10), wherein the cushion member has a shape of an isosceles triangle and an apex angle is disposed along the line. (19) The display device according to any one of (1) to (18), wherein the vibrator is attached to the back side of the display cell by a vibration transmission member.(20) The display device according to (19), wherein the vibration transmission member uses an adhesive or a sheet-like member to transmit vibrations caused by the vibrator to the display cell, while maintaining heat transfer between the vibrator and the display cell and adhesion of the vibrator to the display cell.

[0114] 1, 1000 Display device 20, 20a, 20b, 20c, 20d, 20f, 20g, 20h Cushion member 30 Air layer 40, 140, 151, 310, 311, 1010 Fixing member 50, 150, 1020 Back chassis assembly 100, 100L, 100R Vibrator 110 Inner plate 111 Fixing member 120 Vibration transmission member 152 Back chassis

Claims

1. A display device comprising: a thin-plate-shaped display cell; a vibrator arranged on the back side of the display cell and vibrating the display cell; a rigid member arranged opposite the display cell across a gap and supporting the vibrator; at least one cushion member arranged between the rigid member and the display cell and fixed to the rigid member; and a fixing member arranged on the vibrator along the outer periphery of the display cell to fix the display cell to the rigid member, wherein the cushion member is arranged on the surface of the rigid member according to a line centered on the position of the vibrator and directed toward the fixing member.

2. A display device according to claim 1, comprising a plurality of cushion members, the plurality of cushion members being arranged on the surface of the rigid member in accordance with a plurality of lines that radiate from the position of the vibrator toward the fixed member.

3. The display device according to claim 2, wherein the ratio of the length of any one of the plurality of cushion members projected onto a line of the plurality of lines corresponding to the any one of the cushion members to the length from the position of the vibrator on the line to the fixed member is greater than 0.1 and less than 1.

4. The display device according to claim 3, wherein the ratio is greater than 0.15 and less than 0.

35.

5. The display device of claim 3, wherein each of the first cushion member and the second cushion member among the plurality of cushion members is provided corresponding to each of the first line and the second line among the plurality of lines, and the angle between the second line and the first line, with the position of the vibrator as the vertex, is greater than 0° and not greater than 180°, and no other line among the plurality of lines is sandwiched between the second line and the first line.

6. The display device according to claim 5, wherein the angle is greater than 30° and less than 50°.

7. The display device according to claim 1, wherein the cushion member is in pressable contact with the display cell.

8. The display device according to claim 7, wherein the cushion member is an elastic body having elasticity capable of maintaining the thickness defined as the gap when the display cell is pressed.

9. The display device according to claim 1, wherein the lines are arranged parallel to the vertical or horizontal direction of the fixing member.

10. The display device according to claim 1, wherein the lines are provided obliquely with respect to the vertical or horizontal direction of the fixing member.

11. The display device according to claim 1, comprising a plurality of the cushion members, the cushion members being arranged so that the spacing between them increases toward the fixing member, and pairs of adjacent cushion members among the plurality of cushion members being arranged according to the line.

12. The display device according to claim 1, wherein the cushion member has a rod-like shape along the line, and the end of the rod-like shape facing the vibrator is flat.

13. The display device according to claim 1, wherein the cushion member has a rod-like shape that follows the line, and the end of the rod-like shape on the vibrator side has a curved shape that is convex toward the vibrator side.

14. The display device according to claim 1, wherein the cushion member has a rod-like shape that follows the line, and the end of the rod-like shape on the vibrator side has a steeple shape with an apex on the vibrator side.

15. The display device according to claim 1, wherein the cushion member has a rod-like shape that curves convexly toward the vibrator, and the apex of the convexity is positioned corresponding to the line.

16. The display device according to claim 1, wherein the cushion member has a serpentine shape along the line.

17. The display device according to claim 1, wherein the cushion member has a convex shape facing the vibrator and a closed end at the other end, and the apex of the convex shape is positioned according to the line.

18. The display device according to claim 1, wherein the cushion member has an isosceles triangular shape, with the apex angle being positioned according to the line.

19. The display device according to claim 1, wherein the vibrator is attached to the rear surface side of the display cell by a vibration transmission member.

20. A display device as described in claim 19, wherein the vibration transmission member uses an adhesive or a sheet-like member to transmit vibrations caused by the vibrator to the display cell, while maintaining heat transfer between the vibrator and the display cell and adhesion of the vibrator to the display cell.

Images