WO2018139462A1

WO2018139462A1 - Display device and television device

Info

Publication number: WO2018139462A1
Application number: PCT/JP2018/002016
Authority: WO
Inventors: 由浩尾島
Original assignee: シャープ株式会社
Priority date: 2017-01-24
Filing date: 2018-01-23
Publication date: 2018-08-02
Also published as: JP6404960B2; JP2018121168A

Abstract

Provided are a display device and a television device with improved sound clearness in a mid-frequency range or a low-frequency range, and with a reduced opening area on the front surface side of the display device. The display device has a speaker device having a downwardly oriented sound emitting surface and mounted inside a cabinet, and is mounted on a mounting base. The display device is provided with: a bottom member (30) which is disposed at the bottom of the cabinet facing the sound emitting surface (21), and which has a bottom opening (31) allowing sound from the speaker device (15L) to be output toward the mounting base; and a front opening (35) which is disposed at the front of the cabinet facing the front surface of the display device (1), and which allows the sound from the speaker device to be output toward the front surface of the display device. The bottom member is formed to allow the sound from the speaker device to be reflected toward the front opening.

Description

Display device, television device

The present invention relates to a display device and a television device, and in particular, relates to a display device and a television device that are mounted on an installation table with a speaker device having a sound emitting surface facing downward inside the cabinet.

In the display device, if the speaker devices are installed on both the left and right sides of the display unit, there is a concern that the width of the display device increases. For this reason, a thin display device is known in which the sound emitting surface of the speaker device is directed downward (also referred to as a hidden speaker structure). For example, Patent Document 1 discloses a structure of a display device in which a sound emitting surface of a speaker device is directed obliquely forward and downward.

Japanese Patent No. 4277811

However, in the case of the speaker device disclosed in Patent Document 1, all the sound output obliquely downward is reflected by the acoustic reflector and travels forward. That is, the sound from the speaker device is not output to the display stand of the display device, but is only directed to the front of the display device, and the sound omission in the middle range and the low range is worsened (a feeling of being muffled is also generated). ).
Further, when the opening area for radiating sound from the speaker device to the outside becomes wide on the front side of the display device, there is a problem that the display device is likely to be restricted by design.

The present invention has been made in view of the above-described circumstances, and provides a display device and a television device that improve the sound omission in the middle sound range and the low sound range, and that the opening area on the front side of the display device is slim. The purpose is to do.

In order to solve the above-mentioned problem, a first technical means of the present invention is a display device mounted on an installation stand, wherein a speaker device with a sound emitting surface facing downward is mounted inside a cabinet, A bottom member provided at the bottom of the cabinet facing the sound emitting surface and having a bottom opening capable of outputting sound from the speaker device toward the installation base, and the front of the cabinet facing the front of the display device And a front opening that is capable of outputting sound from the speaker device toward the front of the display device, and the bottom member directs the sound from the speaker device toward the front opening. It is characterized by being formed to be reflective.

The second technical means is a display device in which a speaker device with a sound emitting surface directed downward is mounted inside the cabinet, and is provided at the bottom of the cabinet facing the sound emitting surface. A bottom member having a bottom opening capable of outputting sound downward and a front part of the cabinet facing the front of the display device, and outputs sound from the speaker device toward the front of the display device The bottom member is formed so as to be able to reflect the sound from the speaker device toward the front opening.

According to a third technical means, in the first or second technical means, a rear blocking portion for preventing the sound from the speaker device from being output to the rear of the cabinet at the rear portion of the cabinet facing the front opening. It is characterized by having.

4th technical means WHEREIN: It has the rear side opening part which outputs the audio | voice from the said speaker apparatus in the back of the said cabinet in the rear part of the said cabinet facing the said front part opening in the 1st or 2nd technical means. It is characterized by.

A fifth technical means is characterized in that, in the technical means according to any one of the first to fourth aspects, a tweeter portion with a sound emitting surface facing the front of the display device is installed at a front portion of the cabinet. Is.

The sixth technical means is a television apparatus including the technical means according to any one of 1 to 5.

According to the present invention, since the sound from the speaker device is output from the bottom opening to the installation base, it is possible to improve sound omission in the middle sound range and the low sound range. Further, since the sound from the speaker device is reflected by the bottom member toward the front opening and is output from the front opening, the shortage of the high sound range can be solved.
Further, by providing the bottom member having the bottom opening, the opening area by the front opening can be made slim, so that it is possible to provide a display device that is not easily restricted by design.

1 is a front view of a display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. It is a figure for demonstrating the measurement result of the sound pressure level in 1st Embodiment. It is a figure for demonstrating the measurement result of the sound pressure level in 1st Embodiment. It is a figure for demonstrating the measurement result of the sound pressure level in 1st Embodiment. It is a figure for demonstrating the measurement result of the sound pressure level in 2nd Embodiment.

(First embodiment)
FIG. 1 is a front view of a display device according to a first embodiment of the present invention. The display device 1 (for example, a thin television device) has a rectangular display unit 10. The display unit 10 is, for example, a liquid crystal display device, and is configured as a rectangular LCD (Liquid Crystal Display) panel having a liquid crystal layer, a glass substrate, or the like, or an edge light type in which LEDs are arranged on the side of a light guide plate. Equipped with a backlight.

The display unit 10 is covered with, for example, a resin cabinet 11 except for the front (the positive direction of the Y axis in the drawing). Specifically, the cabinet 11 includes a front cabinet portion 11a, a bottom cabinet portion 11c, and a rear cabinet portion 11b which is located on the back side of the display unit 10 and will be described with reference to FIG. The front cavity portion 11a is formed in a frame shape, for example, and is provided around the LCD panel.

The bottom cavity portion 11c has, for example, a cup shape having an opening (elongated opening 39 described with reference to FIG. 2) on the upper side, and is elongated along the X direction shown in the drawing. The front cavity portion 11a and the rear cavity portion 11b It is provided on the lower side.
The stand 12 is attached to, for example, the center position of the bottom cavity portion 11 c, and the display device 1 is placed on the installation table 50 via the stand 12.

A speaker device 15 having a hidden speaker structure is installed inside the cabinet 11, and the speaker device 15 can output sound within an audible band (for example, about 20 Hz to 20 kHz).
A bottom speaker unit 15L is installed on the left side of the stand 12 when viewed from the front of the display device 1, and a bottom speaker unit 15R is installed on the right side of the stand 12.

Furthermore, a tweeter unit 40L is installed on the left side of the bottom speaker unit 15L when viewed from the front of the display device 1, and a tweeter unit 40R is installed on the right side of the bottom speaker unit 15R.

2 is a cross-sectional view taken along the line II-II in FIG. Since the bottom speaker unit 15L and the bottom speaker unit 15R have the same structure, the bottom speaker unit 15L will be described with reference to FIG. 2, and a detailed description of the bottom speaker unit 15R will be omitted.
As shown in FIG. 2, the bottom cavity portion 11 c is arranged with the elongated opening 39 facing upward (in the positive direction of the Z axis in the figure), and in front of the elongated opening 39 (in the positive direction of the Y axis in the figure) For example, while supporting the back surface of the display part 10, it is contact | abutting to the lower surface of the front cavity part 11a.

The rear cabinet part 11b covers the back side of the display unit 10 and extends downward, and the bottom cabinet part 11c is behind the elongated opening 39 (in the negative direction of the Y axis in the figure), for example, the rear cabinet part 11b is engaged with the lower end.
The bottom speaker portion 15L is disposed in the vicinity of the bottom cavity portion 11c. Specifically, the bottom speaker unit 15 </ b> L is disposed behind the display unit 10 and directly above the elongated opening 39.

Above the elongated opening 39, for example, a horizontally long (long in the X direction in the figure) speaker BOX 20 is provided. The speaker BOX 20 is provided with a sound emitting surface 21 formed downward, and the sound emitting surface 21 faces the elongated opening 39.
The speaker BOX 20 is provided with a center cap 22, and a diaphragm 23 is provided around the center cap 22. The diaphragm 23 is disposed downward, and the edge of the diaphragm 23 is supported by the speaker BOX 20 in the vicinity of the sound emitting surface 21. A voice coil, a magnet, and the like (both not shown) are provided in the back of the center cap 22 (in the positive direction of the Z-axis shown).

In the figure, an example in which the sound emitting surface of the speaker BOX faces directly below has been described. However, the present invention is not limited to this example, and can also be applied to a structure in which the sound emitting surface of the speaker BOX faces downward in the diagonal direction.

The bottom cavity portion 11c of this embodiment has a front opening 35, a bottom member 30, and a rear blocking portion 38.
The front opening 35 is formed on the front surface of the bottom cavity portion 11c facing the front surface of the display device 1, and is provided through the bottom cavity portion 11c in the Y-axis direction shown in the drawing. The front opening 35 is formed, for example, horizontally long (long in the X direction shown in the figure) on the lower side of the front cabinet portion 11a, and has a front reflecting portion 36 extending toward the inside of the bottom cabinet portion 11c. Yes.

The front surface of the bottom cavity portion 11c corresponds to the front portion of the cabinet of the present invention. Alternatively, the front cabinet portion 11a and the bottom cabinet portion 11c may be integrally formed, and the front opening 35 may be provided in the bottom portion of the front cabinet portion 11a. In this case, the front cabinet portion 11a corresponds to the front portion of the cabinet of the present invention.
Further, the sound emitting surfaces of the

tweeter portions

40L and 40R described with reference to FIG. 1 are directed to the front surface of the bottom cavity portion 11c.

The bottom member 30 is disposed on the bottom surface of the bottom cavity portion 11c facing the sound emitting surface 21 of the bottom speaker portion 15L. The bottom surface of the bottom cavity portion 11c corresponds to the bottom portion of the cabinet of the present invention.
The bottom member 30 is formed in, for example, a lattice shape, and includes a plurality of bottom openings 31 provided through the bottom cavity portion 11c in the Z-axis direction shown in the figure, and a plate-like shape disposed around each bottom opening 31. And a bottom reflecting portion 32.

The front cabinet portion 11a and the bottom cabinet portion 11c are integrally formed (or the rear cabinet portion 11b and the bottom cabinet portion 11c are integrally formed), and the bottom portion of the front cabinet portion 11a (or the bottom portion of the rear cabinet portion 11b) A material 30 may be provided. In this case, the front cabinet portion 11a (or the rear cabinet portion 11b) corresponds to the bottom of the cabinet of the present invention.

The rear blocking part 38 is provided on the rear surface of the bottom mold part 11c facing the front opening 35, and is formed without penetrating the bottom mold part 11c in the Y-axis direction shown in the figure. This prevents audio from the speaker device from being output to the rear of the cabinet. The rear surface of the bottom cavity portion 11c corresponds to the rear portion of the cabinet of the present invention. Alternatively, the rear cabinet portion 11b and the bottom cabinet portion 11c may be integrally formed, and the rear blocking portion 38 may be provided on the bottom portion of the rear cabinet portion 11b. In this case, the rear cabinet portion 11b corresponds to the rear portion of the cabinet of the present invention.

In addition, in the figure, the example which has the back side closed part 38 was given and demonstrated. However, the present invention is not limited to this example, and although illustration thereof is omitted, the present invention may have a rear opening that can output the sound from the speaker device to the rear of the cabinet.

Next, when only the bottom speaker unit 15L is driven (the tweeter unit 40L is not driven) with respect to the structure having the bottom cavity portion 11c (first embodiment) and the following Comparative Examples 1 to 3. The sound pressure characteristics were measured using a microphone. The microphone is arranged in front of the speaker unit 15L shown in FIG. 1, and the distance from the speaker unit 15L to the microphone is 1 m. Note that the sound pressure characteristics when only the speaker unit 15R is driven are basically the same as those when only the speaker unit 15L is driven, and thus the description is omitted when only the speaker unit 15R is driven.

FIG. 3 is a diagram for explaining the measurement result of the sound pressure level for the first embodiment and the first comparative example.
First, Comparative Example 1 has a bottom member 30, but does not have a front opening 35 or a rear closing portion 38, and the bottom surface of the bottom cavity portion 11c is formed in a lattice shape. Although it has the bottom part opening 31 and the bottom side reflection part 32, the front surface of the bottom cavity part 11c is closed, and the rear surface of the bottom cavity part 11c is opened.

In the case of Comparative Example 1, when only the bottom speaker unit 15L is driven, the sound pressure level decreases in the 500 Hz to 2 kHz band (middle range) and the 5 kHz band (high range) as shown by the broken line in FIG. The sound pressure level decreased.
On the other hand, in the case of the first embodiment, as shown by the solid line in FIG. 3, the sound pressure level does not decrease even in the middle sound range and the high sound range, and the horn characteristics (peak, dip, etc.) are not confirmed. The sound pressure characteristics could be improved.

If the rear blocking portion 38 is provided as in the first embodiment, the sound from the speaker device 15 can be reflected toward the front opening 35 and the bottom opening 31 without leaking to the rear of the cabinet 11. In addition, if the front opening 35 is provided, the mid-range and high-range sounds from the speaker device 15 can easily be directed to the front of the display device. Therefore, in particular, the sound emission (sound pressure level) in the middle sound range and the high sound range to the front of the display device can be improved.

FIG. 4 is a diagram for explaining the measurement result of the sound pressure level for the first embodiment and the comparative example 2.
Comparative Example 2 has a structure including the front opening 35 and the rear blocking part 38 but not including the bottom member 30, and the front surface of the bottom cavity part 11c is opened, and the rear surface of the bottom cavity part 11c. Is closed, but the bottom surface of the bottom cavity portion 11c is also closed.

In the case of the comparative example 2, when only the bottom speaker unit 15L is driven, the sound pressure level is reduced in the band around 2 kHz (near the boundary between the midrange and the high range) as shown by the broken line in FIG. . Moreover, a peak was confirmed around 1.2 kHz, and a dip was confirmed around 4 kHz.
On the other hand, in the case of the first embodiment, as shown by the solid line in FIG. 4, the sound pressure level does not decrease near the boundary between the midrange and the high range, and no peak or dip is confirmed. The sound pressure characteristics could be improved. Furthermore, it was also found that the sound pressure level increased in a band of 2 kHz or higher (high sound range), and sound in this band was radiated from the bottom opening 31.

If the bottom opening 31 is provided as in the first embodiment, the sound from the speaker device 15 can be output toward the installation base 50 without being muffled inside the bottom cabinet portion 11c, and can be reflected and diffused. Therefore, in particular, the horn characteristics are not confirmed, the sound omission in the middle sound range and the high sound range is improved, and the feeling of being muffled can be suppressed.

Furthermore, by providing the bottom opening 31, the opening area (the length in the Z-axis direction in FIGS. 1 and 2) by the front opening 35 can be made slim. Specifically, the opening area may be about 1/3 of the width required for the speaker device listed in the related art, and a display device that is less subject to design restrictions can be provided.

FIG. 5 is a diagram for explaining the measurement result of the sound pressure level for the first embodiment and the comparative example 3.
Comparative Example 3 has a structure in which the bottom member 30 and the rear blocking part 38 are provided, but the front opening 35 is not provided. The bottom surface of the bottom cavity part 11c is opened, and the rear surface of the bottom cavity part 11c. Is closed, but the front surface of the bottom cavity portion 11c is also closed.

In the case of Comparative Example 3, when only the bottom speaker unit 15L was driven, the sound pressure level was significantly reduced in a band of 2 kHz or higher (high sound range) as shown by a broken line in FIG. In addition, a peak was confirmed around 1.2 kHz.
On the other hand, in the case of the first embodiment, as indicated by the solid line in FIG. 5, the sound pressure level is not decreased even in the high sound range, and no peak is confirmed, so that the sound pressure characteristics can be improved.

If the bottom reflecting portion 32 and the rear blocking portion 38 are provided as in the first embodiment, the sound from the speaker device 15 can be reflected toward the front opening 35 and output from the front opening 35. Therefore, in particular, the shortage of the high sound range can be solved.
2 is provided, the sound from the speaker device 15 is reflected by the front reflection unit 36 and can be output from the front opening 35. Therefore, this configuration also contributes to eliminating the shortage of the high sound range.

(Second Embodiment)
FIG. 6 is a diagram for explaining the measurement result of the sound pressure level for the second embodiment and the first embodiment.
When the bottom speaker unit 11c is provided and only the bottom speaker unit 15L is driven (first embodiment), and both the bottom speaker unit 15L and the tweeter unit 40L are driven (second embodiment). The sound pressure characteristics were measured using a microphone. Note that the sound pressure characteristics when both the speaker unit 15R and the tweeter unit 40R are driven are basically the same as those when both the speaker unit 15L and the tweeter unit 40L are driven. Omitted when both of the tweeter units 40R are driven.

When only the bottom speaker unit 15L is driven as in the first embodiment, the sound pressure level is reduced particularly in a band of 5 kHz or higher (high sound range) as shown by a solid line in FIG.
On the other hand, when both the bottom speaker unit 15L and the tweeter unit 40L are driven as in the second embodiment, the sound pressure level does not decrease even in the high sound range, as shown by the one-dot chain line in FIG. The sound pressure level can be made almost constant (also called flat characteristics) from the mid-range to the high-range. If the

tweeter units

40L and 40R are further installed as in the second embodiment, the shortage of the high sound range can be easily solved.

By the way, in said 1st, 2nd embodiment, although the example which has a stand and was mounted in the installation stand was given and demonstrated, this invention is not limited to this example, For example, a wall hanging structure, Specifically, the present invention can be applied to a structure that is installed on a wall surface without having a stand.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 10 ... Display part, 11 ... Cabinet, 11a ... Front cabinet part, 11b ... Rear cabinet part, 11c ... Bottom cabinet part, 12 ... Stand, 15 ... Speaker apparatus, 15L, 15R ... Bottom speaker part, DESCRIPTION OF SYMBOLS 20 ... Speaker BOX, 21 ... Sound emission surface, 22 ... Center cap, 23 ... Diaphragm, 30 ... Bottom member, 31 ... Bottom opening, 32 ... Bottom side reflection part, 35 ... Front part opening, 36 ... Front side reflection part, 38 ... rear side blocking part, 39 ... elongated opening, 40L, 40R ... tweeter part, 50 ... installation base.

Claims

A speaker device with a sound emitting surface facing downward is mounted inside the cabinet, and is a display device mounted on an installation table,
A bottom member provided at the bottom of the cabinet facing the sound emitting surface, and having a bottom opening capable of outputting sound from the speaker device toward the installation base;
A front opening provided at the front of the cabinet facing the front of the display device, and capable of outputting sound from the speaker device toward the front of the display;
The display device, wherein the bottom member is formed to be able to reflect the sound from the speaker device toward the front opening.
A display device in which a speaker device with a sound emitting surface facing downward is mounted inside a cabinet,
A bottom member provided at the bottom of the cabinet facing the sound emitting surface and having a bottom opening capable of outputting sound from the speaker device downward;
A front opening provided at the front of the cabinet facing the front of the display device, and capable of outputting sound from the speaker device toward the front of the display;
The display device, wherein the bottom member is formed to be able to reflect the sound from the speaker device toward the front opening.
The display device according to claim 1 or 2,
The display device according to claim 1, further comprising a rear blocking portion that prevents a sound from the speaker device from being output to the rear of the cabinet at a rear portion of the cabinet facing the front opening.
The display device according to claim 1 or 2,
A display device comprising: a rear opening portion that outputs sound from the speaker device to the rear of the cabinet at a rear portion of the cabinet facing the front opening.
The display device according to any one of claims 1 to 4,
A tweeter unit having a sound emitting surface facing a front surface of the display device is installed at a front portion of the cabinet.
The television apparatus provided with the display apparatus as described in any one of Claim 1 to 5.