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DESCRIPTION JP2012156987

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DESCRIPTION JP2012156987
An object of the present invention is to provide a speaker on the back side of a display panel, and
output sound with good sound quality and volume while suppressing deterioration in frequency
characteristics and reduction in volume. A display device includes a display panel (11) for
displaying an image, a housing (12) for mounting the display panel (11), and a speaker (13)
provided in the housing (12) on the back side of the display panel (11). The speaker axis x of the
speaker 13 is inclined to the outside in the horizontal direction of the display panel 11 with
respect to the normal y of the display surface of the display panel 11, and the directivity of the
speaker 13 is directed obliquely backward to the outside of the display device 1. Will be placed.
The housing 12 has one or more sound output holes 15 for emitting the sound from the speaker
to the outside at a position outside the speaker axis x. Furthermore, the housing 12 is provided
with one or more sound emission holes 16 for sound quality adjustment on the inner side in the
horizontal direction of the display device 1 than the sound emission holes 15. [Selected figure]
Figure 3
Display device
[0001]
The present invention relates to a display device, and more specifically, to a thin display device
provided with a speaker on the back side of a display panel.
[0002]
For example, thin display devices such as thin television devices and tablet computers are in
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widespread use.
In such a display device, the entire front surface of the housing is almost the display screen of
the display panel, and in many cases, the display is extremely thin in order to emphasize design
and functionality.
[0003]
In the above-described display device, the arrangement configuration of the speaker for audio
output is a problem. When the display screen is disposed on the substantially entire front side of
the display device, the speakers can not be disposed on the front side of the display device.
Therefore, speakers are disposed on the back side and the side of the display panel.
[0004]
As for the speaker configuration in the thin display device as described above, for example, in
Patent Document 1, the sound emitted by the speaker incorporated in the housing of the foldable
portable telephone is generated from the sound hole provided on the side surface of the case on
the side of the speaker. A speaker device that emits outside is disclosed. This speaker device is
provided with sound holes on the front and the side of the speaker. An annular pad is provided
straddling the side surface of the speaker provided with the side sound hole from the front of the
speaker so as to surround the front sound hole and the side sound hole together. By bringing the
annular pad into contact with the inner surface of the housing, the sound passing through the
front sound hole is guided along the inner surface of the housing toward the side sound hole and
merged with the sound passing through the side sound hole near the side sound hole Forming an
external space which leads to a sound hole provided on the side surface of the case. With this
configuration, the sound pressure of the speaker can be improved without increasing the space
for incorporating the speaker or the thickness of the speaker itself.
[0005]
Further, Patent Document 2 discloses a portable terminal aiming to reduce characteristic
deterioration of a speaker output sound while achieving thinning of the device. In this portable
terminal, a case sound hole for outputting sound generated by a speaker is formed on the side
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surface of the rear side case, and a speaker mounting portion is formed in contact with the side
surface on which the case sound hole is formed. ing. The speaker has a speaker sound hole in a
protector that protects the inside. In addition, a cushion material is attached to the protector in
order to form a hollow portion between the speaker and the rear case in a state where the
speaker is attached to the speaker mounting portion. By utilizing the hollow portion between the
protector and the rear case as an acoustic transmission space, it is supposed that the
deterioration of the speaker generated sound is reduced.
[0006]
JP 2007-215075 A JP JP 2007-195011 A
[0007]
For example, if a speaker is disposed inside a housing to which a display panel is attached, a hole
is provided on the back of the housing, and sound is emitted toward the rear of the display
device, the sound wraps around from the rear of the housing and the display device It is
communicated to the user located in front of the.
In general, low-pitched bass has low directivity (straight line), and high-pitched treble has high
directivity. Therefore, as described above, when the sound emission hole for emitting the sound
from the speaker is provided on the back of the case, the low frequency sound is easily
transmitted to the user side, but the high frequency sound is less in the front side. As a result, at
the user position on the front side, the frequency characteristic is degraded, the sound quality is
degraded, and the volume becomes small and can be heard.
[0008]
Conventionally, in a display device such as a flat-screen television provided with an acoustic
system configured of speakers having a plurality of frequency characteristics, a device has been
devised in which a woofer for receiving low-range sound with a large amount of wraparound is
arranged on the back. There is a problem that simply placing a squawker or the like, which is
responsible for the mid-high range sound of about 500 Hz or more, on the back side can not be
done simply in terms of directivity. Therefore, in the display device, it is required to have a
speaker configuration which does not cause deterioration of the frequency characteristic or
reduction of the volume under the restriction in design and function that the display screen is
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arranged substantially on the front of the front side.
[0009]
In the display device based on the portable terminal disclosed in the above-mentioned Patent
Documents 1 and 2, the device is made to emit the sound to the side of the speaker in any case,
but there is a problem with the decrease of the frequency characteristic and the volume. It can
not be said that it is sufficient as the structure to solve. Moreover, although the sound hole is
provided in the front and the side of a speaker in patent document 1, and the device made to join
is only a device of the synthesis | combination in a housing, it is the response when not able to
take such a structure in a housing. Is not mentioned.
[0010]
The present invention has been made in view of the above-described circumstances, and a
speaker is provided on the back side of the display panel to suppress the deterioration of the
frequency characteristic and the reduction of the volume and output the sound with a good
sound quality and volume. It is an object of the present invention to provide a display device as
described above.
[0011]
In order to solve the above-mentioned problems, according to a first technical means of the
present invention, there are provided a display panel for displaying an image, a case for
mounting the display panel, and a speaker provided in the case on the back side of the display
panel. The speaker has a speaker axis of the speaker inclined to the outside in the horizontal
direction of the display panel with respect to the normal of the display surface of the display
panel, and the center of directivity of the speaker Are disposed obliquely toward the outer rear of
the display device, and the housing is for emitting one or more sounds from the speaker to a
position horizontally outside the display panel with respect to the speaker axis. It is characterized
by having a sound emission hole.
[0012]
A second technical means is characterized in that, in the first technical means, the casing is
provided with one or more auxiliary sound output holes on the inner side in the horizontal
direction of the display device than the sound output holes. is there.
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[0013]
A third technical means is characterized in that in the second technical means, the opening area
of the auxiliary sound output hole is smaller than the opening area of the sound output hole.
[0014]
According to a fourth technical means, in the second or third technical means, a back wall
portion in which the housing is disposed parallel to the display panel on the back side of the
display panel, and a horizontal direction of the back wall portion A side wall portion that
connects the rear wall portion and the display panel on the side is provided, and the sound
output hole is provided in the side wall portion.
[0015]
A fifth technical means according to the fourth technical means is characterized in that the
auxiliary sound release hole is provided in the rear wall portion.
[0016]
A sixth technical means according to any one of the second to fifth technical means, wherein a
central axis of the sound output hole defined by a wall shape around the sound output hole is a
side of the display device. It is characterized by facing.
[0017]
A seventh technical means according to any one of the second to sixth technical means, wherein
a central axis of the auxiliary sound emission hole defined by a wall surface shape around the
auxiliary sound emission hole is a side of the display device. It is characterized in that it is facing
the other side.
[0018]
According to an eighth technical means, in the sixth or seventh technical means, an inner
opening of the housing of the sound output hole and / or the auxiliary sound output hole has a
beveled portion by countersunk processing. It is characterized by
[0019]
A ninth technical means relates to any one of the second to eighth technical means, wherein the
sound output hole and the auxiliary sound output hole are an area of the housing located in front
of the diaphragm of the speaker. It is characterized in that it is disposed in a region of a shape
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corresponding to the shape of the diaphragm.
[0020]
According to the present invention, it is possible to provide a display device in which a speaker is
provided on the back side of the display panel to suppress the deterioration of the frequency
characteristic and the reduction of the volume to output the sound with good sound quality and
volume. it can.
[0021]
It is a figure which shows the prior art example for contrasting with the structure of the display
apparatus of this invention.
It is a figure which shows the comparative example for contrasting with the structure of the
display apparatus of this invention.
It is a figure which shows the measurement result of sound pressure when sound is output from
a speaker by the structure of FIG.1 and FIG.2.
It is a figure which shows one Embodiment of the display apparatus of this invention.
It is a figure which shows the measurement result of the sound pressure when sound is output
from a speaker by the structure which provided the sound emission hole in the side of FIG.
It is a figure which shows other embodiment of the display apparatus of this invention.
It is a structure which provided the sound emission hole and auxiliary | assistant sound emission
hole which are shown in FIG. 6, and is a figure which shows the measurement result of sound
pressure when sound is output from a speaker.
It is a figure which shows the more specific structural example of embodiment of the display
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apparatus by this invention.
FIG. 5 is a rear view of an embodiment of a display device according to the present invention.
1 is a front view of an embodiment of a display device according to the present invention.
It is a figure which shows the other structural example of the sound emission hole in the display
apparatus by this invention.
It is a figure which shows the other structural example of the sound emission hole in the display
apparatus by this invention. It is a figure which shows the further another structural example of
the sound emission hole in the display apparatus by this invention. It is a figure which shows the
other structural example of the sound emission hole in the display apparatus of this invention,
and an auxiliary sound emission hole. It is a figure which shows the other structural example of
the sound emission hole in the display apparatus of this invention, and an auxiliary sound
emission hole. It is a figure which shows the example of a setting of the shape of the auxiliary |
assistant sound emission hole in the display apparatus by this invention. It is a figure which
shows the further another structural example of an auxiliary sound emission hole.
[0022]
Hereinafter, an embodiment according to a display device of the present invention, and a
conventional example for comparing and explaining the present invention and a comparative
example will be specifically described with reference to the attached drawings. In all the
drawings for explaining the present invention, parts having the same functions are given the
same reference numerals, and repeated explanation thereof is omitted.
[0023]
FIG. 1 and FIG. 2 are diagrams showing a conventional example and a comparative example for
comparison with the configuration of the display device of the present invention, and
schematically showing the arrangement configuration of the display panel, the housing and the
speaker of the display device. is there. Here, FIG. 1 shows a conventional configuration example,
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and FIG. 2 shows a comparative example for comparison with the embodiment of the present
invention. In FIGS. 1 and 2, 1 is a display device, 11 is a display panel, 12 is a housing (cabinet),
and 13 is a speaker.
[0024]
The display device 1 can be applied to a thin communication terminal device such as a portable
thin television, a tablet computer, etc. For example, since the display screen is disposed on almost
the entire front surface of the display device 1, The speaker 13 is arranged to face the back side
of the display panel. In such a thin display device, as shown in FIG. 1, the speaker 13 is disposed
on the back side of the display panel 11, but in the conventional example, the direction of the
center of the directivity is directed to the rear of the display device 1. More specifically, the
speaker axis (the axis at which the directivity of the speaker is centered) x of the speaker 13
substantially coincides with the normal direction of the display screen of the display panel 11.
Then, in the direction of the center of the directivity of the speaker 13, a sound emission hole 14
for emitting the sound from the speaker 13 is provided outside the housing 12.
[0025]
In this case, as described above, the sound emitted to the rear from the speaker 13 wraps around
outside the housing 12 and reaches the user who views the display screen, but there is a small
amount of wraparound in a high directivity particularly high frequency region, Deterioration of
sound quality and a drop in volume can be felt. On the other hand, as in the comparative example
of FIG. 2, the speaker axis x of the speaker 13 can be inclined. In this case, the speaker axis x is
inclined, for example, by an angle θ with respect to the normal y of the display screen of the
display panel 11. The direction in which the speaker axis x is inclined is inclined outward
outward in the horizontal direction of the display device. As a result, the sound output from the
speaker 13 comes to turn more to the front side, and the sound pressure on the front side is
increased.
[0026]
FIG. 3 is a diagram showing measurement results of sound pressure when sound is output from
the speaker in the configuration of FIG. 1 and FIG. Here, the display device is installed on a stand,
and there is no wall in the vicinity on the back side of the display device, and the frequency
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characteristic of the output sound pressure from the speaker is on the front side of the display
device (the side where the display screen can be viewed). It was measured. In FIG. 3, D1
represents the frequency characteristic in the conventional general configuration shown in FIG.
1, and D2 represents the frequency characteristic when the speaker axis x shown in FIG. 2 is
inclined. In this example, the angle θ of the speaker axis x with respect to the normal y is 7 °.
[0027]
As shown in FIG. 3, in the configuration of FIG. 2 in which the speaker axis x is inclined, the
sound pressure of approximately 2000 Hz or less is higher than the configuration of FIG. 1 in
which the speaker axis x is not inclined. That is, by tilting the speaker axis x outward in the
horizontal direction of the display device 1, the amount of sound wrap around in the middle
frequency range of about 500 to 2000 Hz is increased, and the sound pressure in the middle
frequency range in front is increased. You can see that it goes up. However, simply by inclining
the speaker axis x, the variation in the overall sound pressure is large, and deterioration of the
frequency characteristic is observed. Therefore, the sound quality improvement and the volume
improvement can not be realized only by simply inclining the conventional speaker axis x which
is not inclined with respect to the normal line y.
[0028]
FIG. 4 is a view showing an embodiment of the display device of the present invention, and
schematically showing the arrangement configuration of a display panel, a housing and a speaker
of the display device. As described above, merely by tilting the speaker axis x, the disturbance of
the frequency characteristic occurs. At this time, as shown in FIG. 2, the sound output hole 14 is
provided in the area behind the center of the speaker 13 including the speaker axis x. On the
other hand, in one embodiment according to the present invention, one or more sound output
holes 15 are provided at positions different from those in FIGS. The position of the sound output
hole 15 is set to a position outside the speaker axis x of the speaker 13 in the horizontal
direction of the display device 1. That is, the sound emission hole 15 is not provided at a position
behind the center of the speaker 13 but at a position shifted from the speaker axis x to the side
of the device.
[0029]
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Most of the sound emitted from the speaker 13 propagates along the inner wall surface on the
back side of the housing 13 and is emitted from the sound output hole 15 to the outside of the
housing 13. At this time, the sound pressure directed to the side of the display device 1 is
improved because the position of the sound emission hole 15 is outside the speaker axis x in the
horizontal direction, and the sound coming around to the front is increased. Sound pressure
characteristics at the position are improved. The shape of the sound output hole 15 is not
particularly limited, but in this example, the central axis z of the sound output hole 15 defined by
the wall surface shape around the sound output hole 15 is the side of the display device 1 It is
formed to face. For example, if the space of the sound output hole 15 defined by the surrounding
wall surface shape is a cylinder or a prism, the long axis center of the cylinder or the prism
becomes the central axis z. With this configuration, the directivity of the sound output from the
speaker 13 and emitted to the outside from the inside of the housing 12 can be more laterally
directed, and the wraparound characteristic to the front side of the display device 1 can be
improved. .
[0030]
FIG. 5 is a diagram showing measurement results of sound pressure when sound is output from a
speaker in a configuration in which a sound output hole is provided on the side of FIG. 4. In FIG.
5, D3 shows the frequency characteristic of the structure which provided the sound emission
hole on the side shown in FIG. 4, and displays the detection result D2 in the case of the structure
of FIG. 2 for comparison. D2 is the same as D2 shown in FIG. Also in this example, the angle θ of
the speaker axis x with respect to the normal y is 7 °.
[0031]
As shown in FIG. 5, in a configuration in which the speaker axis x is inclined outward in the
horizontal direction of the display panel 11 with respect to the normal y of the display surface of
the display panel, the speaker axis x is released horizontally outside the speaker axis x. By
providing the sound holes 15, the variation in the frequency band of about 500 Hz to 3 kHz can
be reduced, in particular, as compared with the configuration in which the speaker 13 is simply
inclined as shown in FIG. The effect is seen in However, there is a large characteristic fluctuation
around 5000 Hz, which is insufficient in terms of improving the high frequency characteristic.
That is, in the configuration in which the sound output hole 15 is provided at the position
horizontally outside the speaker axis x, the sound quality and volume improvement effect can be
obtained particularly in the middle frequency range of 500 to 2000 Hz.
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[0032]
FIG. 6 is a view showing another embodiment of the display device of the present invention, and
schematically showing the arrangement configuration of the display panel, the housing, and the
speaker of the display device. As described above, in the configuration in which the speaker axis
x is inclined outward in the horizontal direction of the display panel 11 with respect to the
normal y of the display surface of the display panel 1, the sound emission holes are provided at
the horizontal direction outside the speaker axis x By providing 15, an improvement in the
variation of the frequency band of about 600 Hz to 3 kHz was observed. In the present
embodiment, as shown in FIG. 6, one or a plurality of auxiliary sound output holes 16 are further
provided inside the display device 1 in the horizontal direction than the sound output holes 15.
[0033]
In the configuration of FIG. 4, since the sound output hole 15 is provided on the outer side of the
housing 12, most of the sound output from the speaker 13 first strikes the inner surface of the
housing 12 and propagates while spreading along the inner surface. , Sound emitted from the
sound emission hole 15 to the outside. In this case, although the disturbance of the sound
pressure is small in the relatively low frequency region of the wraparound characteristic, the
disturbance of the frequency characteristic occurs in the high frequency region of, for example,
about 2 to 8 kHz.
[0034]
In the present embodiment, by providing the auxiliary sound output holes 16, part of the sound
output from the speaker 13 is emitted as it is from the front of the speaker to the back side of the
display device 1. As a result, it is possible to further compensate for the variation of the high
frequency range of the sound emitted from the sound emission hole 15 and improve the
frequency characteristic. In this case, if the opening area of the auxiliary sound output hole 16 is
increased, the behavior is similar to that of the conventional configuration as shown in FIG. 1,
and the sound in the low frequency range is bad and the sound pressure level is small. turn into.
Accordingly, the opening area of the auxiliary sound emission hole 16 is determined from the
viewpoint of compensating the high frequency range of the sound from the sound emission hole
15 mainly by the sound emission from the sound emission hole 15 provided on the side of the
speaker axis x. . At least the opening area of the auxiliary sound output hole 16 is smaller than
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the opening area of the sound output hole 15. For example, in the case of a slit-like sound output
hole 15 having a fixed width and length, the auxiliary sound output hole 16 is formed in a slit
shape having a width smaller than that of the sound output hole 15.
[0035]
FIG. 7 is a diagram showing a measurement result of sound pressure when sound is output from
a speaker in a configuration provided with the sound output hole and the auxiliary sound output
hole shown in FIG. In FIG. 7, D4 shows the frequency characteristics when the sound release hole
15 and the auxiliary sound release hole 16 shown in FIG. 6 are provided, and the detection result
D3 in the configuration of FIG. 4 is displayed for comparison. . D3 is the same as D3 shown in
FIG. Also in this example, the angle θ of the speaker axis x with respect to the normal y is 7 °.
[0036]
As shown in FIG. 7, in a configuration in which the speaker axis x is inclined outward in the
horizontal direction of the display panel 11 with respect to the normal y of the display surface of
the display panel, the speaker axis x is released horizontally outside the speaker axis x. By
providing the sound holes 15 and providing the auxiliary sound output holes 16 on the inner
side in the horizontal direction with respect to the sound output holes 15, the variation in the
high frequency band of 2000 Hz or more can be reduced, and the sound quality improvement
effect can be seen. Be In the example of FIG. 7, the variation in sound pressure at 2000 to 80000
Hz is 15 dB for D3 with only the sound emission hole 15, but decreases to 10 dB for D4 with the
sound emission hole 15 and the auxiliary sound emission hole 16 The frequency response has
improved.
[0037]
FIG. 8 is a view showing a more specific configuration example of the embodiment of the display
device according to the present invention, and the one schematically shown in FIG. 6 is shown as
a more specific configuration example. In the configuration of FIG. 8, in the configuration in
which the speaker axis x is inclined outward in the horizontal direction of the display panel 11
with respect to the normal y of the display surface of the display panel A sound hole 15 is
provided, and a plurality of auxiliary sound output holes 16 are further provided on the inner
side in the horizontal direction of the display device 1 than the sound output hole 15. The sound
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output from the speaker 13 is emitted to the outside of the housing 12 from a sound emission
hole 15 provided on the outer side in the horizontal direction than the speaker axis x. As a result,
the sound quality (frequency characteristics) and the volume of the sound that wraps around to
the front user side from the side of the display device 1 are improved, and particularly the sound
quality and the volume characteristics of the middle frequency range of about 500 to 2000 Hz.
Further, by providing the auxiliary sound output holes 16, the sound quality particularly in the
high frequency range of 2000 Hz or more is improved, and the user can be made to emit sound
with a good sound quality and a good volume level.
[0038]
9 is a view showing the back side of the display device having the configuration of FIG. 8, FIG. 9
(A) is an entire back view of the display device 1, and FIG. 9 (B) is a release of FIG. 9 (A). It is a
principal part perspective view of the part which provided the sound hole and the auxiliary
sound emission hole. The display device 1 of this example is formed in a form that can be placed
upright on a desk or the like by a stand 17 that pivots in a hinged manner. FIG. 10 is a view
showing the opposite surface of the display device 1 (the front side of the display device 1), and a
substantially entire area of the front side is a display screen by the display panel 11.
[0039]
The speakers 13 are provided at two places, upper left and right of the display device 1. One or
more speakers 13 are disposed at one place. Then, as shown in FIG. 8, the sound output holes 15
are provided at positions outside the display device 1 in the horizontal direction with respect to
the speaker axes of the speakers 13. In this example, the sound output hole 15 forms a slit-like
opening as a whole by aligning a plurality of rectangular openings on a straight line. The slit-like
openings are arranged in two rows.
[0040]
Then, an auxiliary sound emission hole 16 is provided inside the display device 1 in the
horizontal direction with respect to the sound emission hole 15. Also in the auxiliary sound
output hole 16, a plurality of rectangular openings are aligned on a straight line, thereby forming
a slit-like opening as a whole. The horizontal width of each rectangular opening of the auxiliary
sound emission hole 16 is smaller than the width of the sound emission hole 15, and the opening
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area of the auxiliary sound emission hole 16 as a whole is the opening area of the sound
emission hole 15. It is smaller than that. With such a configuration, with the configuration in
which the speaker is provided on the back side of the display panel, it is possible to suppress the
deterioration of the frequency characteristic and the reduction of the volume and output the
sound with a good sound quality and volume.
[0041]
FIG. 11 is a view showing another configuration example of the sound output hole in the display
device according to the present invention, which corresponds to the main part perspective view
of FIG. 9 (B). In the example of FIG. 11, only the sound emission hole 15 is provided to contribute
to the improvement of the volume and the sound quality. In this example, the side wall portion
12s of the housing 12 constitutes a surface perpendicular to the display panel, and the sound
output hole 15 has a configuration in which rectangular openings are aligned in a straight line on
the side surface of the housing 12. The sound pressure directed to the side of the display device
1 is improved because the position of the sound output hole 15 is more outside in the horizontal
direction with respect to the speaker axis x compared to the configuration example of FIG. There
is a lot of noise coming around, and the sound pressure characteristic at the front user position is
improved.
[0042]
FIG. 12 is a view showing another configuration example of the sound output hole in the display
device according to the present invention, which corresponds to the perspective view of the main
part of FIG. 9 (B). In the example of FIG. 12, only the sound emission hole 15 is provided to
contribute to the improvement of the volume and the sound quality. The sound release holes 15
are formed by forming a plurality of rectangular openings aligned in a straight line. In terms of
design, the sound output holes 15 have a shape that simulates the heat release holes.
[0043]
FIG. 13 is a view showing still another example of the configuration of the sound output hole in
the display device according to the present invention, which corresponds to the perspective view
of the main part of FIG. 9 (B). In the example of FIG. 13, only the sound output holes 15 are
provided to contribute to the improvement of volume and sound quality, and the sound output
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holes 15 have a configuration in which rectangular openings are aligned on a straight line. The
central axis of the sound output hole 15 formed by each rectangle is substantially directed to the
side of the display device 1.
[0044]
FIG. 14 is a view showing another configuration example of the sound output hole and the
auxiliary sound output hole in the display device of the present invention, and FIG. 14 (A) is a
view showing approximately half on the back side of the display device; These are figures which
show the example of a structure of the sound emission hole and auxiliary sound emission hole
which are shown to FIG. 14 (A). Loudspeakers (not shown) are provided at two places, upper left
and right of the display device 1. As shown in FIG. 14A, a plurality of sound output holes 15 and
auxiliary sound output holes 16 are provided in the wall surface of the housing 12 facing the
speaker.
[0045]
In the case of this example, the sound output holes 15 and the auxiliary sound output holes 16
are respectively formed of a plurality of circular through holes, and these through holes are
arranged concentrically. If it demonstrates by FIG. 14 (B), let the virtual center of a concentric
circle be o. o is at the intersection point of the h axis coincident with the horizontal direction of
the display and the v axis coincident with the vertical direction. The horizontal direction outside
of the display panel 11 is in the direction indicated by the arrow P.
[0046]
Then, the intersection point o is made coincident with the speaker axis which is the center of the
directivity of the speaker, and a plurality of through holes are concentrically provided so as to
conform to the circular shape of the diaphragm of the speaker. In this case, although it is not
essential to make the speaker axis and the intersection point o coincide exactly, it is preferable
that the through holes be disposed on the front side of the diaphragm of the speaker in
accordance with the shape of the diaphragm. That is, the sound output holes 15 and the auxiliary
sound output holes 16 are disposed in the area of the housing located in front of the diaphragm
of the speaker and in the area of the shape corresponding to the shape of the diaphragm. As a
result, the sound output from the speaker can be efficiently emitted to the outside of the casing
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from the sound output hole 15 and the auxiliary sound output hole 16 disposed in front of the
diaphragm of the speaker.
[0047]
In this example, a sound emission hole 15 for emitting the sound from the speaker to the outside
is provided at a position outside the display panel 1 in the horizontal direction with respect to the
intersection point o through which the speaker axis passes. The sound output hole 15 is
composed of a plurality of through holes disposed on the outer side in the P direction from the vaxis in FIG. 14 (B), and is indicated by a white circle in the drawing. On the other hand, a plurality
of auxiliary sound emission holes 16 are provided at a position horizontally inside the
intersection point o through which the speaker axis passes. The auxiliary sound output hole is
composed of a plurality of through holes arranged on the inner side (opposite to the P direction)
from the v axis in FIG. 14B, and is indicated by a white circle in the drawing.
[0048]
The total opening area of all the auxiliary sound emission holes 16 is set smaller than the total
opening area of all the sound emission holes 15. As a result, it is possible to compensate for the
variation in the high frequency range of the sound emitted from the sound emission hole 15 and
improve the frequency characteristic. Further, by changing the number and area of the through
holes constituting the sound release hole 15 and the number and area of the auxiliary sound
release hole 16, the optimum frequency characteristics can be selected according to the shape of
the display panel, the use environment and the like. It can be adjusted to be obtained.
[0049]
Further, in FIG. 14, those indicated by black circles other than the sound output hole 15
indicated by a white circle and the auxiliary sound output hole 16 do not penetrate the wall
portion of the case of the display panel 1 and the thickness direction of the case The recess 17 is
hollowed out halfway. By providing the plurality of recesses 17 in the concentric space where the
sound release hole 15 and the auxiliary sound release hole 16 are not arranged, it appears that
concentric holes are provided according to the shape of the speaker in appearance , Design
effects can be obtained. Therefore, the provision of the recess 17 is not essential. For example,
the area excluding the sound output hole 15 and the auxiliary sound output hole 16 may be
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processed to be flat.
[0050]
FIG. 15 is a view showing still another configuration example of the sound output hole and the
auxiliary sound output hole in the display device of the present invention, and is a view showing
approximately half on the back side of the display device. In this example, a plurality of sound
output holes 15 and an auxiliary sound output hole 16 are provided on the wall surface of the
housing 12 facing the speaker as in FIG. 14, but unlike the example of FIG. Each shape of the
sound hole 16 is an elongated slit shape. In this example, each sound output hole 15 and the
auxiliary sound output hole 16 each have a shape in which an oval is curved.
[0051]
At this time, the sound output hole 15 is provided at a position outside the horizontal direction of
the display panel 1 with respect to the intersection point o through which the speaker axis
passes, and a plurality of auxiliary sound output holes 16 at a position inside the horizontal point
o Provide And the major axis direction of the curved oval is arranged to coincide with the
circumferential direction of the concentric circle.
[0052]
The hole shape of this example shows an example of the variation of the respective opening
shape of the sound output hole 15 and the auxiliary sound output hole 16, and the present
invention is not limited to these shapes, and the sound output hole 15 is appropriately selected.
And the shape of the auxiliary sound emission hole 16 can be designed. At this time, the sound
emission characteristics of the sound emission hole 15 and the auxiliary sound emission can be
designed by adjusting the number and the area of the sound emission hole 15 and the auxiliary
sound emission hole 16. The compensation characteristic by the sound hole 16 can be optimized.
Also in this case, a recess having the same shape as the sound output hole 15 and the auxiliary
sound output hole 16 may be provided in a space formed concentrically to provide a design
effect.
[0053]
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FIG. 16 is a view showing a setting example of the shape of the auxiliary sound output hole in the
display device according to the present invention, and FIG. 16 (A) is a view showing a
configuration example of main parts including a speaker of the display device; FIG. 16 is an
enlarged view of a cross section of the auxiliary sound output hole 16 shown in FIG. In the
display device 1, the speaker axis x of the speaker 13 is inclined to the outside in the horizontal
direction of the display panel 11 with respect to the normal y of the display surface of the
display panel 11. A plurality of sound output holes 15 are provided at positions horizontally
outside the speaker axis x, and a plurality of auxiliary sound output holes 16 are provided inside
the display device 1 in the horizontal direction further than the sound output holes 15.
[0054]
In this example, the sound output from the speaker 13 is emitted to the outside of the housing
12 from the sound output hole 15 provided on the outer side in the horizontal direction than the
speaker axis x. Further, the auxiliary sound emission hole 16 emits sound toward the back of the
housing 12. Here, the central axis q of the auxiliary sound output hole 16 in this example is
inclined to the side of the display device 1. The central axis q is defined by the wall surface shape
around the auxiliary sound output hole 16. For example, if the auxiliary sound output hole 16
forms a cylindrical or prismatic space, the long axis center of the cylindrical or rectangular
column Is the central axis q. The direction of the central axis q is inclined to the side of the
display device 1 with respect to the normal y of the display panel. Thereby, when the sound
emitted from the speaker 13 is emitted through the auxiliary sound emission hole 16, the sound
emitted toward the side of the display device 1 along the direction of the inclined central axis q,
the display device The sound coming around to the front side of 1 is increased, and the sound
pressure characteristic at the front user position can be improved.
[0055]
FIG. 17 is a view showing still another configuration example of the auxiliary sound output hole.
The auxiliary sound output hole 16 has the central axis q of the auxiliary sound output hole 16
inclined to the side of the display device 1 with respect to the normal y of the display panel, as in
the configuration of FIG. Further, in the case of the configuration of the present example, the
inside of the case of the auxiliary sound output hole 16 is further subjected to counterbore
processing. That is, an inclined surface 16 a by counterbore processing is formed in the case
inner side opening portion of the auxiliary sound output hole 16. With such a configuration, it
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can be expected that the sound output from the speaker 13 inside the housing 12 can be
collected more effectively and emitted from the auxiliary sound output hole 16.
[0056]
Although the above-mentioned example makes the central axis q incline to the side of display 1
about auxiliary sound emission hole 16, it can be considered as the same composition also about
sound emission hole 15. FIG. For example, in the case of the configuration as shown in FIG. 8, the
central axis q is directed to the side of the display device 1 from the beginning, but when
providing the sound output holes 15 in the configuration as shown in FIG. The central axis of the
sound emission hole 15 can be configured to be directed to the side of the display device 1. As a
result, the sound emitted from the sound emission hole 15 increases in the amount of sound
coming to the front side, and the sound pressure characteristic at the user position on the front
can be improved.
[0057]
The above-described counterbore processing can also be applied to the sound output hole 15.
That is, by providing the inclined surface by counterbore processing in the case inner side
opening part of the sound output hole 15, it can be expected that a more effective sound
collection effect is produced.
[0058]
As described above, in the embodiment according to the present invention, the sound output hole
15 can be provided, and the sound output hole 15 and the auxiliary sound output hole 16 can be
further provided to improve the sound quality. be able to. It is obvious that the sound output
holes 15 and the auxiliary sound output holes 16 are not limited to the above-mentioned
configuration, and can be appropriately set without departing from the present invention.
[0059]
DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 11 ... Display panel, 12 ... Housing | casing
12s ... Side wall part, 13 ... Speaker, 13 ... Housing | casing, 14 ... Sound emission hole, 15 ...
Sound emission hole, 16 ... Auxiliary sound emission hole, 17 ... stand.
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