Display device

Abstract

To provide a display unit with which the effect of sound diffusion in the vertical direction can be easily obtained.SOLUTION: A display unit comprises a speaker system and a display panel. The speaker system is provided on an upper part of the display unit, and has a first speaker and a second speaker whose sound output surfaces face each other in the transverse direction of the display unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art There is known a speaker system that reduces directivity with respect to an angle of deviation based on the normal direction of an audio output surface while suppressing vibration of the entire speaker system (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-107751 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the television receiver (television) described in Patent Document 1, speaker systems are arranged on the left and right of the television, and the two speakers of each speaker system are arranged so that their audio output surfaces face each other in the vertical direction. As a result, in the television described in Patent Document 1, sound tends to spread in the horizontal direction of the television (the surface direction perpendicular to the normal direction of the audio output surface), but it is difficult to achieve a sound diffusion effect in the vertical direction.

[0005] An object of one embodiment of the present invention is to provide a display device that can easily achieve a sound diffusion effect in the vertical direction. [Means for solving the problem]

[0006] A display device according to one embodiment of the present invention is a display device comprising a speaker system and a display panel, the speaker system having a first speaker and a second speaker arranged on the upper part of the display device and having audio output surfaces facing each other in the left-right direction of the display device. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of a display device according to a first embodiment. [Diagram 2] FIG. 1 is a side view of a display device according to a first embodiment. [Diagram 3] FIG. 11 is a front view of a display device according to a second embodiment. [Figure 4] FIG. 11 is a side view of a display device according to a second embodiment. [Diagram 5] FIG. 13 is a front view of a display device according to a third embodiment. [Figure 6] FIG. 13 is a side view of a display device according to a third embodiment. [Figure 7] FIG. 13 is a diagram showing sound diffusion by a display device of a comparative example. [Figure 8] FIG. 2 is a diagram illustrating sound diffusion by the display device according to the first embodiment. [Figure 9] FIG. 11 is a diagram illustrating sound diffusion by a display device according to a second embodiment. [Figure 10] FIG. 13 is a diagram illustrating sound diffusion by a display device according to a third embodiment. [Figure 11A] FIG. 1 is a diagram showing sound propagation by a display device of a comparative example (part 1). [Figure 11B] FIG. 13 is a diagram showing sound propagation by the display device of the comparative example (part 2). [Figure 12A] FIG. 1 is a diagram showing sound propagation by the display device according to the first embodiment (part 1). [Figure 12B] FIG. 2 is a diagram showing sound propagation by the display device according to the first embodiment (part 2). [Figure 13] FIG. 4 is a front view of a modified example of the display device according to the first embodiment. [Figure 14A] FIG. 2 is a front view of the speaker system 7C. [Figure 14B] FIG. 2 is an enlarged view of a speaker system 7C. [Figure 15] FIG. 2 is a cross-sectional view of a speaker system 7C. [Figure 16A] FIG. 13 is a plan view of a first modified example of speaker system 7C. [Figure 16B] FIG. 13 is a plan view of a second modified example of speaker system 7C. [Figure 16C] FIG. 13 is a plan view of a third modified example of speaker system 7C. [Figure 17A] FIG. 13 is a side view of a fourth modified example of speaker system 7C. [Figure 17B] FIG. 13 is a front view of a fourth modified example of speaker system 7C. [Figure 17C] FIG. 13 is a plan view of a fourth modified example of speaker system 7C. [Figure 17D] FIG. 4 is a rear view of a fourth modified example of the speaker system 7C. [Figure 18A] FIG. 2 is a perspective view of a speaker system 7C. [Figure 18B] FIG. 2 is a perspective view of a speaker system 7C. [Figure 18C] FIG. 2 is a perspective view of a speaker system 7C. [Figure 19A] FIG. 2 is a perspective view of a speaker system 7C. [Figure 19B] FIG. 2 is a perspective view of a speaker system 7C. [Figure 19C] FIG. 2 is a perspective view of a speaker system 7C. [Figure 20] 13A and 13B are six-sided views illustrating a diffuser 31 included in a fourth modified example of speaker system 7C. [Figure 21] A perspective view of the diffuser 31 is shown. [Figure 22A] 2 is a cross-sectional view of the diffuser 31 taken along line AA'. FIG. [Figure 22B] 2 is a cross-sectional view of the diffuser 31 taken along line AA'. FIG. [Figure 22C] 4 is a cross-sectional view of the diffuser 31 taken along line BB'. FIG. [Figure 22D] 4 is a cross-sectional view of the diffuser 31 taken along line BB'. FIG. [Figure 22E] 3 is a cross-sectional view of the diffuser 31 taken along line CC'. FIG. [Figure 22F] 3 is a cross-sectional view of the diffuser 31 taken along line CC'. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicated explanations will be omitted.

[0009] Fig. 1 is a front view of the display device according to the first embodiment, and Fig. 2 is a side view of the display device according to the first embodiment.

[0010] The display device 101 includes a panel module (display panel) 3, speaker systems 7C, 7L, and 7R, and a rear housing 6. The display device 101 is, for example, a television device.

[0011] The panel module 3 includes, for example, a rectangular LCD (Liquid Crystal Display) panel having a liquid crystal layer and a glass substrate, and although not shown, for example, a protective glass, a polarizing plate, a diffusion plate, a backlight, and a circuit board for driving the display device 101. The LCD panel included in the panel module 3 is an example, and may be, for example, an organic EL (Electro Luminescence) panel.

[0012] The speaker system 7C is installed on the upper part of the display device 101, specifically, above the panel module 3 when viewed from the front of the display device 101. The speaker system 7L is installed on the left side of the panel module 3 when viewed from the front of the display device 101, and the speaker system 7R is installed on the right side of the panel module 3. Each of the speaker systems 7L, 7R is formed so as to be, for example, substantially flush with the panel module 3 on the front side of the display device 1, and is formed so as to be, for example, flush with the rear housing 6 on the rear side of the display device 1. Each of the speaker systems 7C, 7L, 7R can output sound within the audible band (for example, about 20 Hz to 20 kHz).

[0013] Each of the speaker systems 7C, 7L, and 7R includes two speakers (a first speaker 10 and a second speaker 20) and a diffuser 31.

[0014] The first speaker 10 and the second speaker 20 are arranged with their audio output surfaces facing each other, are connected to the same amplifier (not shown), and output the same sound. In detail, the first speaker 10 and the second speaker 20 of the speaker system 7C are arranged with their audio output surfaces facing each other in the left-right direction of the display device 101. The first speaker 10 and the second speaker 20 of the speaker systems 7L and 7R are arranged with their audio output surfaces facing each other in the top-bottom direction of the display device 101.

[0015] The diffuser 31 is provided between the first speaker 10 and the second speaker 20, and reflects sounds emitted by the first speaker 10 and the second speaker 20.

[0016] The speaker system 7C is not limited to the above-described configuration and can be modified. For example, the speaker system 7C does not need to have the diffuser 31.

[0017] Speaker system 7C, which has two speakers with their audio output surfaces facing each other, has the characteristic that sound waves tend to spread in a plane direction perpendicular to the normal direction of the audio output surfaces. Therefore, when speaker system 7C is installed on top of display device 101, speakers 10 and 20 of speaker system 7C have audio output surfaces facing each other in the left-right direction of display device 101, so that they can diffuse sound in the front-rear and up-down directions of display device 101. Also, speakers 10 and 20 of speaker systems 7L and 7R have audio output surfaces facing each other in the up-down direction of display device 102, so that they can diffuse sound in the front-rear and up-down directions of display device 101.

[0018] Figure 3 is a front view of the display device according to the second embodiment, and Figure 4 is a side view of the display device according to the second embodiment.

[0019] The display device 102 has a panel module (display panel) 3, speaker systems 7C, 7L, and 7R, and a rear housing 6. Each of the speaker systems 7C, 7L, and 7R has two speakers (a first speaker 10 and a second speaker 20) and a diffuser 31.

[0020] In display device 102 of the second embodiment, the position of speaker system 7C is different from the position of speaker system 7C of display device 101 of the first embodiment, and the positions of speaker systems 7L, 7R in the second embodiment are similar to the positions of speaker systems 7L, 7R in the first embodiment.

[0021] The speaker system 7C of the display device 102 is installed on the upper part of the display device 102, and more specifically, is installed so that a part of the speaker system 7C (for example, the upper half of the speaker system 7C) protrudes above the panel module 3 when viewed from the front of the display device 102. In other words, when the display device 102 is viewed from the front, only a part of the speaker system 7C is visible. This ensures the design of the display device 102 when viewed from the front.

[0022] Speaker system 7C, which has two speakers with their audio output surfaces facing each other, has the characteristic that sound waves tend to spread in a plane direction perpendicular to the normal direction of the audio output surface, and sound waves spread even if speaker system 7C is not completely visible. Therefore, when speaker system 7C is installed on top of display device 102, even if part of speaker system 7C is covered by panel module 3 when viewed from the front of display device 102, sound can be diffused in the front-rear and up-down directions of display device 102.

[0023] According to the display device of the second embodiment, it is possible to spread sound in the front-back and up-down directions while ensuring the design of the display device when viewed from the front.

[0024] Figure 5 is a front view of the display device according to the third embodiment, and Figure 6 is a side view of the display device according to the third embodiment.

[0025] The display device 103 has a panel module (display panel) 3, speaker systems 7C, 7L, and 7R, and a rear housing 6. Each of the speaker systems 7C, 7L, and 7R has two speakers (a first speaker 10 and a second speaker 20) and a diffuser 31.

[0026] In display device 103 of the third embodiment, the position of speaker system 7C is different from the position of speaker system 7C of display device 101 of the first embodiment, and the positions of speaker systems 7L, 7R in the third embodiment are similar to the positions of speaker systems 7L, 7R in the first embodiment.

[0027] The speaker system 7C of the display device 103 is installed on the upper part of the display device 103, and more specifically, is installed so that the speaker system 7C is not visible when viewed from the front of the display device 103. That is, when the display device 102 is viewed from the front, the speaker system 7C is on the rear side of the display device 103 and is blocked by the panel module 3, so that the speaker system 7C is not visible. This ensures a better design when viewed from the front of the display device 103 than the display device 102. Note that in FIG. 5, the speaker system 7C is shown by a dotted line so that the position of the speaker system 7C can be easily understood, but the speaker system 7C is actually not visible when viewed from the front of the display device 103.

[0028] The speaker system 7C, which has two speakers with their audio output surfaces facing each other, has the characteristic that sound waves tend to spread in a plane direction perpendicular to the normal direction of the audio output surface. Therefore, when the speaker system 7C is installed on the upper part of the display device 103, even if the speaker system 7C is covered by the panel module 3 when viewed from the front of the display device 103, the sound can be diffused in the front-rear and up-down directions of the display device 103. Even if the panel module 3 is located in front of the speaker system 7C as in the third embodiment, the sound generated from the speaker system 7C goes around the upper part of the panel module 3 and is diffused in front of the display device 103.

[0029] According to the display device of the third embodiment, it is possible to spread sound in the front-back and up-down directions while ensuring the design of the display device when viewed from the front.

[0030] Next, the upward diffusion of sound in each of the display devices 101, 102, and 103 according to the first to third embodiments will be described in comparison with the upward diffusion of sound in a display device of a comparative example.

[0031] Fig. 7 is a diagram showing sound diffusion by a display device of a comparative example. Fig. 8 is a diagram showing sound diffusion by a display device according to a first embodiment. Fig. 9 is a diagram showing sound diffusion by a display device according to a second embodiment. Fig. 10 is a diagram showing sound diffusion by a display device according to a third embodiment.

[0032] Fig. 7 is a side view of a display device 501 and a user 521 of a comparative example. Figs. 8 to 10 are also side views of the display devices 101 to 103 and the user 521. In Figs. 7 to 10, the display devices 501, 101 to 103 and the user 521 are in a room with a ceiling, and the user 521 is positioned a predetermined distance in front of the display devices 101 to 103, 501.

[0033] The display device 501 of the comparative example has a speaker system 511 on the upper part of the display device 501. The speaker system 511 is installed so as not to be visible when a user 521 looks at the display device 501 from the front. In addition, the sound output surface of the speaker of the speaker system 511 faces above the display device 501, i.e., toward the ceiling.

[0034] The sound emitted upward from speaker system 511 is reflected by the ceiling and propagates downward to where user 521 is.

[0035] In the comparative example shown in Fig. 7, the speakers in speaker system 511 are arranged so that their sound output surfaces face in the same direction, specifically, upward. Speaker system 511, in which the sound output surfaces of the speakers face in the same direction, has a narrower sound diffusion and reflection area and a narrower sweet spot (area where good sound quality can be obtained) than speaker system 7C, which has two speakers arranged so that their sound output surfaces face each other. In Fig. 7, at the position where user 521 is located, the sound reflected from the ceiling cannot be obtained sufficiently, making it difficult to obtain good sound quality.

[0036] 8 to 10, the speaker system 7C of the display devices 101 to 103 has two speakers 10, 20 arranged with their audio output surfaces facing each other, and has the characteristic that sound waves tend to spread in a plane direction perpendicular to the normal direction of the audio output surface. Therefore, sound can be diffused over a wide area above the display devices 101 to 103, and reflected sound from the ceiling can also be obtained over a wide area, resulting in a wide sweet spot (area where good sound quality can be obtained).

[0037] 8 to 10, the sound reflected from the ceiling is sufficiently received at the position of user 521, and good sound quality is obtained. Also, in Figs. 8 to 10, since the sweet spot (area where good sound quality can be obtained) is wide, good sound quality can be obtained even if user 521 moves back and forth a little.

[0038] Furthermore, even if the sound output surface of the speaker of the speaker system 511 of the comparative example faces diagonally upward rather than directly above the display device 501, the area from which reflected sound can be obtained simply moves, and the sweet spot (the area from which good sound quality can be obtained) does not become wider.

[0039] Fig. 11A is a diagram showing sound propagation by a display device of a comparative example (part 1), and Fig. 12A is a diagram showing sound propagation by a display device according to the first embodiment (part 1).

[0040] A display device 501 of the comparative example in FIG. 11A has a speaker system (height speaker) 511 described in FIG.

[0041] As described above, the sound output surface of the speaker in speaker system 511 faces upward, i.e., toward the ceiling, of display device 501. Also, the sound output surface of the speaker in speaker system 512 faces forward, i.e., toward the direction in which user 521 is located.

[0042] 11A, the path (solid arrow) over which sound from speaker system 511 reaches user 521 is longer than the path (dotted arrow) over which sound from speaker system 512 reaches user 521. This causes user 521 to perceive a delay in the sound from speaker system 511 relative to the sound from speaker system 512, which is one of the causes of deterioration in sound quality.

[0043] Furthermore, since the distance from the display device 501 to the ceiling varies depending on the conditions under which the display device 501 is installed, it is necessary to measure and adjust the delay each time the display device 501 is installed.

[0044] 12A according to the first embodiment, speaker system 7C is installed on the top of display device 101, and sound from speaker system 7C reaches user 521 directly. Also, the difference between the distance between speaker system 7C and user 521 (solid arrow) and the distance between speaker system 7R (or 7L) and user 521 (dotted arrow) becomes constant and does not depend on the installation state of display device 101. As a result, the sound heard from display device 101 has less reverberation (delay) and good sound quality.

[0045] 11A and 12A have described the case where sound is reflected from the ceiling and reaches the user. Next, a case where the ceiling is high and the reflected sound does not reach the user will be described.

[0046] Fig. 11B is a diagram showing sound propagation by a display device of a comparative example (part 2). Fig. 12B is a diagram showing sound propagation by a display device according to the first embodiment (part 2). Figs. 11B and 12B show sound propagation when the ceiling is high, and the display devices 501 and 101 are similar to those described in Figs. 11A and 12A.

[0047] 11B, sound emitted upward by speaker system 511 is reflected by the ceiling and propagates downward where user 521 is, but because the ceiling is high, the reflected sound is attenuated (disappears) along the way and does not reach user 521. Also, if there is no ceiling, sound emitted upward by speaker system 511 is not reflected and does not reach user 521.

[0048] In the display device 101 according to the first embodiment shown in FIG. 12B, the speaker system 7C can diffuse sound in the front-rear and up-down directions of the display device 101 as described above. As shown in FIG. 12B, the sound diffused above the display device 101 is reflected by the ceiling and propagates downward where the user 521 is located. However, since the ceiling is high, the reflected sound attenuates (disappears) on the way and does not reach the user 521, as in the comparative example of FIG. 11A. However, the speaker system 7C can also diffuse sound in front of the display device 101, so the sound of the speaker system 7C reaches the user 521 directly. In this way, according to the display device 101 according to the first embodiment, it is possible to deliver the sound of the speaker system 7C to the user 521 even when there is no reflected sound from the ceiling.

[0049] FIG. 13 is a front view of a modified example of the display device according to the first embodiment.

[0050] In the display device 101 of FIG. 1, one speaker system 7C is installed in the center of the upper part of the display device 101, but two speaker systems 7CL and 7CR may be installed on the left and right of the upper part of the display device 101A as in the display device 101A shown in FIG. 13. The speaker system 7CL is installed on the left side of the upper part of the display device 101 as seen from the front of the display device 101, and more specifically, it is installed in a position close to the upper left end of the panel module 3 as seen from the front of the display device 101. The speaker system 7CR is installed on the right side of the upper part of the display device 101 as seen from the front of the display device 101, and more specifically, it is installed in a position close to the upper right end of the panel module 3 as seen from the front of the display device 101. The structures of the speaker systems 7CL and 7CR are the same as those of the speaker system 7C. That is, the speaker systems 7CL and 7CR each have two speakers (first speaker 10 and second speaker 20) and a diffuser 31.

[0051] Furthermore, like the speaker system 7C in the second embodiment, the speaker systems 7CL and 7CR may be installed such that, when viewed from the front of the display device 101A, parts of the speaker systems 7CL and 7CR protrude above the panel module 3. In other words, when the display device 101A is viewed from the front, only parts of the speaker systems 7CL and 7CR may be visible.

[0052] Furthermore, the speaker systems 7CL and 7CR may be installed so that they are not visible when viewed from the front of the display device 101A, like the speaker system 7C in the third embodiment. That is, when the display device 101A is viewed from the front, the speaker systems 7CL and 7CR are on the rear side of the display device 101A and are blocked by the panel module 3, so that the speaker systems 7CL and 7CR may not be visible.

[0053] Next, the speaker system 7C of the first embodiment will be described in detail. The configuration of the speaker system 7C of the second and third embodiments is the same as that of the speaker system 7C of the first embodiment. The speaker systems 7L and 7R are different in position and orientation on the display device 101 from the speaker system 7C, but have the same structure, so the description of the speaker systems 7R and 7L will be omitted. The configuration of the speaker systems 7L and 7R of the embodiment is an example, and the structure does not need to be the same as that of the speaker system 7C, and can be changed as appropriate.

[0054] Fig. 14A is a front view of speaker system 7C seen from the front of display device 101, and shows a state in which covers located on the front side of first and second enclosures 11 and 21 described in Fig. 14A and covering first speaker unit 12 and resonance tube 13, and second speaker unit 22 and resonance tube 23 have been removed from first and second speakers 10 and 20. Fig. 14B is an enlarged view of Fig. 14A.

[0055] The first speaker 10 has a first enclosure 11 formed in a substantially cylindrical shape and extending in the left-right direction. As shown in Fig. 14A, the first enclosure 11 houses a first speaker unit 12 and a resonance tube 13. The first speaker unit 12 is, for example, a speaker for outputting mid-low range sounds (mid-bass speaker), and is installed at the right end of the first enclosure 11.

[0056] The first speaker unit 12 has a magnetic circuit section 12b in which a voice coil (not shown) and the like are arranged, and a diaphragm is provided on the right side of the magnetic circuit section 12b, forming a sound output surface 12a facing to the right.

[0057] On the other hand, the second speaker 20 has a second enclosure 21 that is formed in a substantially cylindrical shape and extends in the left-right direction. A second speaker unit 22 and a resonance tube 23 are housed in the second enclosure 21. The second speaker unit 22 is, for example, a mid-bass speaker, and is installed at the left end of the second enclosure 21.

[0058] The second speaker unit 22 has a magnetic circuit section 22b in which a voice coil (not shown) and the like are arranged, and a diaphragm is provided on the left side of the magnetic circuit section 22b, forming a sound output surface 22a facing leftward.

[0059] In this manner, the audio output surface 12a of the first speaker unit 12 and the audio output surface 22a of the second speaker unit 22 face each other in the left-right direction of the display device 101.

[0060] Although the first and second speaker units 12 and 22 are mid-bass speakers in the above example, they may be other types of speakers, such as a tweeter and a squawker, or a mid-high speaker.

[0061] A connecting member 30 is provided between the first enclosure 11 and the second enclosure 21. Specifically, the connecting member 30 is formed, for example, in a semicylindrical cross section with the front side of the display device 101 open, and connects the right end of the first enclosure 11 and the left end of the second enclosure 21 on the rear side of the display device 101.

[0062] 14B, the connecting member 30 is provided with a diffuser (also called an acoustic diffuser) 31. The diffuser 31 has a function of reflecting the sounds from the first and second speaker units 12 and 22 in all directions (concentrically) of the display device 101. For example, the diffuser 31 is disposed in the middle between the sound output surface 12a of the first speaker unit 12 and the sound output surface 22a of the second speaker unit 22.

[0063] Fig. 15 is a cross-sectional view taken along line IV-IV in Fig. 14B. Diffuser 31 is composed of spherical portions 31a, 31a', a cylindrical portion 31b, and a hollow portion 31c having a flat portion or a filling (such as sound absorbing cotton).

[0064] When a reflective surface has a concave shape, a sound focus occurs. The best sound quality is obtained when the sound is listened to at the focal point (the so-called sweet spot), but even a slight deviation from that position results in a decrease in sound quality. This embodiment aims to minimize the difference (variation) in sound quality regardless of the listening position, and after examining shapes that are as unlikely to cause a focus as possible, it was determined that a completely convex shape (=spherical) is the most effective.

[0065] The spherical portions 31a and 31a' are formed at least in a front position facing the front side of the display device 101. The spherical portion 31a has a curved surface that is convex toward the left, is formed to a size that fits within the sound output surface 12a of the first speaker unit 12, and is disposed opposite the sound output surface 12a. The spherical portion 31a' has a curved surface that is convex toward the right, is formed to a size that fits within the sound output surface 22a of the second speaker unit 22, and is disposed opposite the sound output surface 22a. The spherical portion 31a is an example of a first hemisphere, and the spherical portion 31a' is an example of a second hemisphere.

[0066] The columnar portion 31b is located between the spherical portion 31a and the spherical portion 31a' and is formed integrally with the spherical portions 31a and 31a'. The columnar portion 31b may be formed separately from the spherical portions 31a and 31a'. The columnar portion 31b is an example of a cylinder.

[0067] A hollow portion 31c having a flat portion or a filling material (such as sound absorbing cotton) is formed at a rear position facing the rear side of the display device 101, and a shaft portion 32 is provided at a central position. The diffuser 31 is fixed to the connecting member 30 via the shaft portion 32.

[0068] This makes it easier to install the shaft portion 32 in the diffuser 31 compared to a case in which the rear side of the display device 101 is also formed in a spherical shape. In addition, since the shaft portion 32 can be formed long, it is also easier to install it in the connecting member 30.

[0069] 15, an example of the diffuser 31 configured with the spherical portions 31a, 31a', the cylindrical portion 31b, and the flat portion or the hollow portion 31c having a filling (such as sound absorbing cotton) has been described. However, the diffuser 31 is not limited to this example, and it is sufficient that the diffuser 31 has a spherical shape at least in the forward position facing the front side of the display device 101.

[0070] FIG. 16A is a plan view of a first modified example of speaker system 7C.

[0071] 16A, the diffuser 31 may be formed as a nearly perfect sphere and fixed to the connecting member 30 via a shaft (not shown) at the midpoint between the first and second speaker units 12, 22. In this case as well, the sound from the first and second speaker units 12, 22 spreads more evenly in the vertical and horizontal directions compared to the conventional case.

[0072] FIG. 16B is a plan view of a second modified example of speaker system 7C.

[0073] As shown in FIG. 16B, the diffuser 31 may be formed in a spherical shape at a front position facing the front side of the display device 101, and in a flat or hollow shape at a rear position facing the rear side of the display device 101. In this case, the diffuser 31 is fixed to the connecting member 30 via the shaft 32 at a middle position between the first speaker unit 12 and the second speaker unit 22, and the sound from the first and second speaker units 12 and 22 spreads more evenly in the vertical and horizontal directions than in the conventional case. According to the modified example (part 2) of the speaker system 7C, it is easier to install the shaft 32 on the diffuser 31 than when the rear side of the display device 101 is also formed in a spherical shape. Since the shaft 32 can be made longer, it is also easier to install it on the connecting member 30.

[0074] FIG. 16C is a plan view of a third modified example of speaker system 7C.

[0075] 15, or hollow portion 31c having a filling (such as sound-absorbing cotton), diffuser 31 may be formed similarly on both the front side and the back side of display device 101, as shown in Fig. 16C, and may be formed with spherical portion 31a arranged opposite first speaker unit 12, spherical portion 31a' arranged opposite second speaker unit 22, and cylindrical portion 31b arranged between spherical portion 31a and spherical portion 31a'. Even in this case, sound from first and second speaker units 12 and 22 spreads more evenly in the vertical and horizontal directions than in the past.

[0076] Fig. 17A is a side view of the fourth modified example of speaker system 7C. Fig. 17B is a front view of the fourth modified example of speaker system 7C. Fig. 17C is a plan view of the fourth modified example of speaker system 7C. Fig. 17D is a rear view of the fourth modified example of speaker system 7C.

[0077] 18A to 18C and 19A to 19C are perspective views of speaker system 7C. Note that O in Fig. 18A indicates the position of the origin in the XYZ spatial coordinate system (a spatial coordinate system in which an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other are defined) shown in Fig. 17B.

[0078] As can be seen from Figures 17A to 17C, 18A to 18C, and 19A to 19C, speaker system 7C includes two speakers (first speaker 10 and second speaker 20) whose audio output surfaces (audio output surface 12a of first speaker 10 and audio output surface 22a of second speaker 20) face each other.

[0079] The two speakers 10 and 20 are speaker units that are connected to the same amplifier (not shown) and emit the same sound. Note that, although the two speakers 120 are mid-bass speakers for outputting mid-low sounds in this embodiment, the two speakers 120 may be other types of speakers (for example, tweeters, squawkers, mid-high speakers, etc.).

[0080] The speaker system 7C includes a diffuser 31 that reflects the sound emitted by the first speaker 10 and the sound emitted by the second speaker 20 toward a specific half-space. Here, the specific half-space specifically refers to a half-space consisting of an infinite number of coordinates where the Y coordinate value in the XYZ spatial coordinate system is positive.

[0081] As can be seen from FIG. 17B, in a space represented by the XYZ spatial coordinate system (a space in which positions within the space are represented by coordinate values ​​of the XYZ spatial coordinate system), the first speaker 10, the second speaker 20, and the diffuser 31 are arranged side by side along the Z axis (first axis) in the order of first speaker 10, diffuser 31, second speaker 20.

[0082] Furthermore, the speaker system 7C has two enclosures (a first enclosure 11 containing the first speaker 10, and a second enclosure portion 21 containing the second speaker 20). As can be seen from Figures 17B and 17D) and 18A, the speaker system 7C has a wall-shaped (U-shaped) connecting member 140 between the first enclosure 11 and the second enclosure 21 that connects the first enclosure portion 11 and the second enclosure portion 21.

[0083] The diffuser 31 is attached to this connecting member 140 .

[0084] A sound absorbing material may be attached to the inside of the U-shape of connecting member 140, or all or a part of connecting member 140 may be made of a sound absorbing material.

[0085] The structure of the diffuser 31 will be described in further detail below with reference to FIG.

[0086] FIG. 20 is a six-sided view showing a diffuser 31 provided in a fourth modification of the speaker system 7C.

[0087] Figure 20(a) shows a left side view of the diffuser 31. Figure 20(b) shows a front view of the diffuser 31. Figure 20(c) shows a plan view of the diffuser 31. Figure 20(d) shows a rear view of the diffuser 31. Figure 20(e) shows a bottom view of the diffuser 31. Figure 20(f) shows a right side view of the diffuser 31.

[0088] Fig. 21 is a perspective view of diffuser 31. Figs. 22A to 22F are various cross-sectional views of diffuser 31.

[0089] Specifically, Fig. 22A is a cross-sectional view taken along line A-A'. Fig. 22B is a cross-sectional view taken along line A-A'. Fig. 22C is a cross-sectional view taken along line B-B'. Fig. 22D is a cross-sectional view taken along line B-B'. Fig. 22E is a cross-sectional view taken along line CC'. Fig. 22F is a cross-sectional view taken along line CC'.

[0090] As can be seen from Figs. 17A to 17D, 20, and 21, the diffuser 31 has a plane-symmetric (approximately plane-symmetric) shape with the XY plane (plane perpendicular to the first axis) as the plane of symmetry. As can be seen from Figs. 17A to 17D and 19A to 19C, the plane of symmetry is a plane on which the distance from the sound output surface 12a of the first speaker 10 and the distance from the sound output surface 22b of the second speaker 20 are approximately equal. The plane of symmetry may be a plane on which both distances are completely equal. Furthermore, the diffuser 31 may have a completely plane-symmetric shape with the XY plane (plane perpendicular to the first axis) as the plane of symmetry.

[0091] 20, 21, and 22A to 22F, the diffuser 31 includes a speaker 112. Specifically, as can be seen from Figs. 17A to 17D, the diffuser 110 includes a speaker 112 at a position straddling the plane of symmetry. More specifically, the diffuser 31 includes a speaker 112 whose center of the sound output surface is located within the plane of symmetry.

[0092] The sound output surface of the speaker 112 faces a direction parallel to the XY plane in the specific half space.

[0093] The speaker 112 of the diffuser 31 in the fourth variant of the speaker system 7C is a speaker (tweeter) for high-pitched output that is connected to an amplifier other than the amplifier described above, but the speaker 112 may be another type of speaker (for example, a mid-bass speaker, a squawker, a mid-high speaker, etc.).

[0094] As shown in FIG. 20(b), the diffuser 31 has two reflecting surfaces 111.

[0095] One of the two reflecting surfaces 111 reflects the sound emitted by the first speaker 10 toward one of the two quarter spaces obtained by dividing the specific half space. Here, one quarter space refers to a space consisting of an infinite number of coordinates in the XYZ spatial coordinate system, where the Y coordinate value and the Z coordinate value are positive.

[0096] The other of the two reflecting surfaces 111 reflects the sound emitted by the second speaker 20 toward the other of the two quarter spaces. Here, the other quarter space refers to a space consisting of an infinite number of coordinates in the XYZ spatial coordinate system, where the Y coordinate value is positive and the Z coordinate value is negative.

[0097] In other words, the Y-axis component (second axis component) of the normal vector has the same positive and negative values ​​at all positions on all the reflecting surfaces (two reflecting surfaces 111) of diffuser 110. Specifically, the Y-axis component of the normal vector at all positions is a positive value.

[0098] According to diffuser 31 of the fourth modification of speaker system 7C, the sound from first speaker 10 and second speaker 20 is reflected in the left and right directions of display device 101, increasing the spread of the sound.

[0099] The structure of the diffuser 31 is not limited to the above-mentioned structure. For example, the diffuser 31 may reflect the sounds emitted by the first speaker 10 and the second speaker 20 in all directions, instead of in a specific direction within a half space.

[0100] Speaker system 7C having two speakers arranged with their sound output surfaces facing each other has the characteristic that sound waves tend to spread in a plane direction perpendicular to the normal direction of the sound output surfaces.

[0101] Therefore, in the display devices of the first to third embodiments, the speaker system 7C has two speakers whose sound output surfaces are arranged facing each other in the left-right direction of the display device, making it easier for sound to diffuse above the display device and easier to achieve a sound diffusion effect.

[0102] Furthermore, according to the display devices of the first to third embodiments, the diffuser 31 of the speaker system 7C provided on the upper part of the display device 101 increases the spread of sound in the horizontal left and right directions, so that even if there are no speaker systems 7L, 7R installed on the left and right of the display device, the spread of sound in the horizontal left and right directions can be obtained.

[0103] Furthermore, the present invention is not limited to the above-described embodiment and can be modified, and the above configurations can be replaced with substantially the same configurations, configurations that achieve the same effects, or configurations that can achieve the same purpose.

[0104] Each of the speaker systems 7L, 7R in the first to third embodiments may have, instead of two speakers whose audio output surfaces face each other in the vertical direction, a speaker whose audio output surface faces forward of the display device 101, a speaker whose audio output surface faces directly to the side of the display device 101, or a speaker whose audio output surface faces diagonally inward or outward toward the front of the display device 101. Furthermore, the speakers of the speaker systems 7L, 7R are not limited to full-range speakers and may be tweeters. The display device 101 of the first to third embodiments may have a speaker system under the panel module 3, instead of or in addition to the speaker systems 7L and 7R. The speaker system under the panel module 3 has at least one of a speaker whose audio output surface faces forward of the display device 101 and a speaker whose audio output surface faces downward of the display device 101. The speaker system 7C according to the first to third embodiments can be used in the display device 101 in combination with the various speaker systems described above. [Explanation of symbols]

[0105] 101,101A,102,103 Display device 7C, 7L, 7R speaker system 10 1st Speaker 20 2nd Speaker 31 Diffuser

Claims

1. A display device comprising a first speaker system, a second speaker system, and a display panel, the first speaker system includes a first speaker and a second speaker that are provided on an upper left side of the display device when the display device is viewed from the front, and whose audio output surfaces face each other in the left-right direction of the display device; The second speaker system is a display device having a third speaker and a fourth speaker, the third speaker and fourth speaker being arranged on the upper right side of the display device when viewed from the front, and whose audio output surfaces face each other in the left-right direction of the display device.

2. 2. The display device according to claim 1, wherein a portion of the first speaker system and a portion of the second speaker system protrude above the display panel when the display device is viewed from the front.

3. 2. The display device according to claim 1, wherein the first speaker system and the second speaker system are invisible when the display device is viewed from the front.

4. 4. The display device according to claim 1, wherein the first speaker system further comprises a diffuser disposed between the first speaker and the second speaker and reflecting sounds emitted by the first speaker and the second speaker.

5. The display device according to claim 1 , wherein the display device is a television device.

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