JP7680888B2 - display device - Google Patents

Description

The present invention relates to a display device.

A speaker system is known that reduces the directivity with respect to the deviation angle based on the normal direction of the sound output surface while suppressing vibration of the entire speaker system (see, for example, Patent Document 1).

JP 2014-107751 A

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 left-right 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.

One aspect of the present invention aims to provide a display device that can easily achieve a sound diffusion effect in the vertical direction.

A display device according to one aspect of the present invention is a display device including a speaker system and a display panel, the speaker system having a first speaker and a second speaker provided on the upper portion of the display device, the first speaker and the second speaker having audio output surfaces facing each other in the left-right direction of the display device.

1 is a front view of a display device according to a first embodiment. 1 is a side view of a display device according to a first embodiment. FIG. 13 is a front view of a display device according to a second embodiment. FIG. 11 is a side view of a display device according to a second embodiment. FIG. 13 is a front view of a display device according to a third embodiment. FIG. 13 is a side view of a display device according to a third embodiment. FIG. 13 is a diagram showing sound diffusion by a display device of a comparative example. 3A and 3B are diagrams illustrating sound diffusion by the display device according to the first embodiment. 13A and 13B are diagrams illustrating sound diffusion by a display device according to a second embodiment. 13A and 13B are diagrams illustrating sound diffusion by a display device according to a third embodiment. FIG. 11 is a diagram showing sound propagation by a display device of a comparative example (part 1). FIG. 11 is a diagram showing sound propagation by a display device of a comparative example (part 2). FIG. 1 is a diagram showing sound propagation by the display device according to the first embodiment (part 1). FIG. 11 is a diagram showing sound propagation by the display device according to the first embodiment (part 2). FIG. 11 is a front view of a modified example of the display device according to the first embodiment. FIG. 2 is a front view of the speaker system 7C. FIG. 2 is an enlarged view of the speaker system 7C. FIG. 2 is a cross-sectional view of the speaker system 7C. FIG. 11 is a plan view of a first modified example of the speaker system 7C. FIG. 11 is a plan view of a second modified example of the speaker system 7C. FIG. 11 is a plan view of a third modified example of the speaker system 7C. FIG. 11 is a side view of a fourth modified example of the speaker system 7C. FIG. 11 is a front view of a fourth modified example of the speaker system 7C. FIG. 11 is a plan view of a fourth modified example of the speaker system 7C. FIG. 4 is a rear view of a fourth modified example of the speaker system 7C; FIG. 2 is a perspective view of a speaker system 7C. FIG. 2 is a perspective view of a speaker system 7C. FIG. 2 is a perspective view of a speaker system 7C. FIG. 2 is a perspective view of a speaker system 7C. FIG. 2 is a perspective view of a speaker system 7C. FIG. 2 is a perspective view of a speaker system 7C. 6A to 6C are six-sided views showing a diffuser 31 provided in a fourth modified example of the speaker system 7C. A perspective view of the diffuser 31 is shown. A cross-sectional view of the diffuser 31 taken along line A-A'. A cross-sectional view of the diffuser 31 taken along line A-A'. A cross-sectional view of the diffuser 31 taken along line B-B'. A cross-sectional view of the diffuser 31 taken along line B-B'. A cross-sectional view of the diffuser 31 taken along line C-C'. A cross-sectional view of the diffuser 31 taken along line C-C'.

The following describes the embodiments with reference to the drawings. Note that in the drawings, the same or equivalent elements are given the same reference numerals, and duplicate descriptions are omitted.

Figure 1 is a front view of a display device according to a first embodiment. Figure 2 is a side view of a display device according to a first embodiment.

The display device 101 has 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.

The panel module 3 may be, for example, a rectangular LCD (Liquid Crystal Display) panel having a liquid crystal layer and a glass substrate, and although not shown, may be, 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 of the panel module 3 is one example, and may be, for example, an organic EL (Electro Luminescence) panel.

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

The speaker systems 7C, 7L, and 7R each have two speakers (a first speaker 10 and a second speaker 20) and a diffuser 31.

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.

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

Note that the speaker system 7C is not limited to the above-described configuration and can be modified, for example, without the diffuser 31.

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 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 they can diffuse sound in the front-rear and up-down directions of display device 101.

Figure 3 is a front view of a display device according to the second embodiment. Figure 4 is a side view of a display device according to the second embodiment.

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.

In the display device 102 of the second embodiment, the position of the speaker system 7C is different from the position of the speaker system 7C in the display device 101 of the first embodiment, and the positions of the speaker systems 7L and 7R in the second embodiment are the same as the positions of the speaker systems 7L and 7R in the first embodiment.

The speaker system 7C of the display device 102 is installed on the top of the display device 102, and more specifically, is installed so that a part of the speaker system 7C (e.g., 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.

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, sound can be diffused in the front-to-back and up-to-down directions 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.

The display device of the second embodiment can spread sound in the front-back and up-down directions while maintaining the design of the display device when viewed from the front.

Figure 5 is a front view of a display device according to the third embodiment. Figure 6 is a side view of a display device according to the third embodiment.

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.

In the display device 103 of the third embodiment, the position of the speaker system 7C is different from the position of the speaker system 7C in the display device 101 of the first embodiment, and the positions of the speaker systems 7L and 7R in the third embodiment are the same as the positions of the speaker systems 7L and 7R in the first embodiment.

The speaker system 7C of the display device 103 is installed on the top 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. In other words, 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 with a dotted line to make the position of the speaker system 7C easier to understand, but the speaker system 7C is actually not visible when viewed from the front of the display device 103.

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 speaker system 7C is installed on top of display device 103, even if speaker system 7C is covered by panel module 3 when viewed from the front of display device 103, sound can be diffused in the front-to-back and up-to-down directions of display device 103. Note that even if there is a panel module 3 in front of speaker system 7C as in the third embodiment, sound generated by speaker system 7C will wrap around the top of panel module 3 and be diffused in front of display device 103.

The display device of the third embodiment can spread sound in the front-to-back and up-to-down directions while maintaining the design of the display device when viewed from the front.

Next, the upward sound diffusion of the display devices 101, 102, and 103 of the first to third embodiments will be explained in comparison with the upward sound diffusion of the display device of the comparative example.

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

Figure 7 is a side view of a display device 501 and a user 521 in a comparative example. Similarly, Figures 8 to 10 are side views of the display devices 101 to 103 and the user 521. In Figures 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 located a predetermined distance in front of the display devices 101 to 103 and 501.

The display device 501 of the comparative example has a speaker system 511 on the top of the display device 501. The speaker system 511 is installed so that it is not visible when the 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.

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

In the comparative example shown in FIG. 7, the speakers in speaker system 511 are arranged with their sound output surfaces facing the same direction, specifically, upward. Speaker system 511, in which the sound output surfaces of the speakers face 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 with their sound output surfaces facing each other. In FIG. 7, at the position where user 521 is located, the sound reflected from the ceiling is not sufficiently received, making it difficult to obtain good sound quality.

On the other hand, the speaker system 7C of the display devices 101-103 shown in Figures 8-10 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 101-103, and reflected sound from the ceiling can also be obtained over a wide area, resulting in a wider sweet spot (area where good sound quality can be obtained).

In Figures 8 to 10, at the position where the user 521 is located, the sound reflected from the ceiling is sufficiently received, and good sound quality is obtained. Also, in Figures 8 to 10, since the sweet spot (area where good sound quality is obtained) is wide, good sound quality is obtained even if the user 521 moves back and forth slightly.

In addition, even if the sound output surface of the speaker of the speaker system 511 of the comparative example faces diagonally upwards rather than directly above the display device 501, the area where reflected sound can be obtained simply moves, and the sweet spot (area where good sound quality can be obtained) does not become wider.

Figure 11A is a diagram showing sound propagation by a display device of a comparative example (part 1). Figure 12A is a diagram showing sound propagation by a display device of the first embodiment (part 1).

The display device 501 of the comparative example in FIG. 11A has a speaker system (height speaker) 511 described in FIG. 7 and a speaker system (front speaker) 512 provided at the bottom of the display device 501.

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

In the comparative example shown in FIG. 11A, the path (solid arrow) that the sound from speaker system 511 takes to reach user 521 is longer than the path (dotted arrow) that the sound from speaker system 512 takes to reach 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.

In addition, the distance between the display device 501 and the ceiling changes depending on the conditions under which the display device 501 is installed, so the delay needs to be measured and adjusted each time it is installed.

On the other hand, in the display device 101 according to the first embodiment shown in FIG. 12A, the speaker system 7C is installed on the top of the display device 101, and the sound from the speaker system 7C reaches the user 521 directly. In addition, the difference between the distance between the speaker system 7C and the user 521 (solid arrow) and the distance between the speaker system 7R (or 7L) and the user 521 (dotted arrow) becomes constant and is not dependent on the installation state of the display device 101. As a result, the sound heard from the display device 101 has less reverberation (delay) and good sound quality.

Figures 11A and 12A explain the case where sound is reflected from the ceiling and reaches the user, but next we will explain the case where the ceiling is high and the reflected sound does not reach the user.

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

In the comparative example shown in FIG. 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.

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, because the ceiling is high, the reflected sound attenuates (disappears) along 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.

Figure 13 is a front view of a modified example of the display device according to the first embodiment.

In the display device 101 of FIG. 1, one speaker system 7C is installed in the center of the top of the display device 101, but two speaker systems 7CL, 7CR may be installed on the left and right of the top 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 top of the display device 101 when viewed 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 when viewed from the front of the display device 101. The speaker system 7CR is installed on the right side of the top of the display device 101 when viewed 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 when viewed from the front of the display device 101. The structure of the speaker systems 7CL, 7CR is the same as that of the speaker system 7C. That is, speaker systems 7CL and 7CR each have two speakers (a first speaker 10 and a second speaker 20) and a diffuser 31.

The speaker systems 7CL, 7CR may be installed such that a portion of the speaker systems 7CL, 7CR protrudes above the panel module 3 when viewed from the front of the display device 101A, like the speaker system 7C in the second embodiment. In other words, only a portion of the speaker systems 7CL, 7CR may be visible when the display device 101A is viewed from the front.

The speaker systems 7CL, 7CR may be installed such that they are not visible when viewed from the front of the display device 101A, like the speaker system 7C in the third embodiment. In other words, when the display device 101A is viewed from the front, the speaker systems 7CL, 7CR are located on the rear side of the display device 101A and are blocked by the panel module 3, so that the speaker systems 7CL, 7CR may not be visible.

Next, the speaker system 7C of the first embodiment will be described in detail. Note that the configuration of the speaker system 7C of the second and third embodiments is similar to the configuration of the speaker system 7C of the first embodiment. Also, since the position and orientation of the speaker systems 7L and 7R on the display device 101 are different from that of the speaker system 7C but the structure is the same, the description of the speaker systems 7R and 7L will be omitted. Also, 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.

Figure 14A is a front view of the speaker system 7C as seen from the front of the display device 101, showing the state in which the covers that are located on the front side of the first and second enclosures 11 and 21 described in Figure 14A and cover the first speaker unit 12 and resonance tube 13, and the second speaker unit 22 and resonance tube 23, respectively, have been removed from the first and second speakers 10 and 20. Figure 14B is an enlarged view of Figure 14A.

The first speaker 10 has a first enclosure 11 that is formed in a substantially cylindrical shape and extends 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.

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 an audio output surface 12a facing to the right.

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. The second enclosure 21 houses a second speaker unit 22 and a resonance tube 23. The second speaker unit 22 is, for example, a mid-bass speaker, and is installed at the left end of the second enclosure 21.

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 an audio output surface 22a facing leftward.

In this way, 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.

Note that while the first and second speaker units 12 and 22 are shown as mid-bass speakers, they may be other types of speakers, such as tweeters and squawkers, mid-high speakers, etc.

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 semi-cylindrical 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.

As shown in FIG. 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 sound from the first and second speaker units 12 and 22 in all directions (concentrically) of the display device 101, and is installed, for example, at a midpoint between the sound output surface 12a of the first speaker unit 12 and the sound output surface 22a of the second speaker unit 22.

Figure 15 is a cross-sectional view taken along line IV-IV in Figure 14B. The diffuser 31 is composed of spherical parts 31a and 31a', a cylindrical part 31b, and a flat part or a hollow part 31c containing a filling (such as sound-absorbing cotton).

When a reflective surface has a concave shape, a sound focus occurs. The best audio quality is obtained when the sound is listened to at the focal point (the so-called sweet spot), but even slightly off that position causes the audio quality to degrade. This embodiment aims to minimize the difference (variation) in audio 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.

The spherical portions 31a and 31a' are formed at least in a forward 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.

The cylindrical 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'. Note that the cylindrical portion 31b may be formed separately from the spherical portions 31a and 31a'. The cylindrical portion 31b is an example of a cylinder.

The hollow portion 31c, which has a flat portion or a filling (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 the center. The diffuser 31 is fixed to the connecting member 30 via the shaft portion 32.

This makes it easier to install the shaft 32 in the diffuser 31 compared to when the rear side of the display device 101 is also formed in a spherical shape. In addition, because the shaft 32 can be formed long, it is also easier to install it in the connecting member 30.

In FIG. 15, an example of a diffuser 31 composed of spherical portions 31a, 31a', a cylindrical portion 31b, and a flat portion or a hollow portion 31c having a filling (such as sound-absorbing cotton). 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 a forward position facing the front side of the display device 101.

Figure 16A is a plan view of a modified example (part 1) of speaker system 7C.

As shown in FIG. 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 and 22. Even in this case, the sound from the first and second speaker units 12 and 22 spreads more evenly in the vertical and horizontal directions than in the past.

Figure 16B is a plan view of a modified example (part 2) of speaker system 7C.

As shown in FIG. 16B, the diffuser 31 may be formed as a sphere at the front position facing the front side of the display device 101, and may be formed as a flat or hollow shape at the rear position facing the back side of the display device 101. In this case, the diffuser 31 is fixed to the connecting member 30 via the shaft 32 at the intermediate 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 back side of the display device 101 is also formed as a sphere. Since the shaft 32 can be made longer, it is also easier to install it on the connecting member 30.

Figure 16C is a plan view of a modified example (part 3) of speaker system 7C.

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

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

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

As can be seen from Figures 17A-17C, 18A-18C, and 19A-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.

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

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 in which the Y coordinate value in the XYZ spatial coordinate system is positive.

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.

The speaker system 7C also 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 Figs. 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.

The diffuser 31 is attached to this connecting member 140.

In addition, a sound-absorbing material may be attached to the inside of the U-shape of the connecting member 140, or all or part of the connecting member 140 may be made of a sound-absorbing material.

The structure of the diffuser 31 will be explained in more detail below with reference to Figure 20.

Figure 20 is a six-sided view showing the diffuser 31 provided in variant (part 4) of speaker system 7C.

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.

Figure 21 is a perspective view of the diffuser 31. Figures 22A to 22F are various cross-sectional views of the diffuser 31.

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 C-C'. FIG. 22F is a cross-sectional view taken along line C-C'.

As can be seen from Figures 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 Figures 17A to 17D and 19A to 19C, the plane of symmetry is a plane in 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. Note that the plane of symmetry may be a plane in 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.

As can be seen from Figures 20, 21, and 22A to 22F, the diffuser 31 is provided with a speaker 112. Specifically, as can be seen from Figures 17A to 17D, the diffuser 110 is provided with a speaker 112 located across the above-mentioned plane of symmetry. More specifically, the diffuser 31 is provided with a speaker 112 whose center of the sound output surface is located within the above-mentioned plane of symmetry.

The audio output surface of the speaker 112 faces in a direction parallel to the XY plane within the specific half space.

The speaker 112 of the diffuser 31 in the fourth variation of the speaker system 7C is a high-pitched output speaker (tweeter) 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.).

Also, as shown in FIG. 20(b), the diffuser 31 has two reflecting surfaces 111.

One of the two reflecting surfaces 111 reflects the sound emitted by the first speaker 10 toward one of the two quarter spaces that divide 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.

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.

In other words, the Y-axis component (second axis component) of the normal vector at every position on every reflecting surface (two reflecting surfaces 111) of the diffuser 110 has the same positive and negative values. Specifically, the Y-axis component of the normal vector at every position is a positive value.

The diffuser 31 of the fourth variant of the speaker system 7C reflects the sound from the first speaker 10 and the second speaker 20 to the left and right of the display device 101, increasing the spread of the sound.

The structure of the diffuser 31 is not limited to the above structure. For example, the diffuser 31 may reflect the sound emitted by the first speaker 10 and the second speaker 20 in all directions, rather than in a specific direction within a half space.

Speaker system 7C, which has two speakers with 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, in the display devices according to the first to third embodiments, the speaker system 7C has two speakers whose sound output surfaces are arranged to face each other in the left-right direction of the display device, so sound is more likely to diffuse above the display device, making it easier to achieve a sound diffusion effect.

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

The present invention is not limited to the above-described embodiment, but 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 objectives.

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 according to 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.

101, 101A, 102, 103 Display device 7C, 7L, 7R Speaker system 10 First speaker 20 Second speaker 31 Diffuser

Claims (5)

A display device including 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. 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. 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. 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. The display device according to any one of claims 1 to 4, wherein the display device is a television device.

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