close

Вход

Забыли?

вход по аккаунту

JP2012216905

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2012216905
A display device which can be used as a parametric speaker and whose directivity can be
changed is provided. The display device includes a polarization member (120). The polarizing
member 120 includes the piezoelectric film 10, the polarizer layers 22 and 24, and the plurality
of first electrodes 12. The polarizer layers 22 and 24 are formed on the piezoelectric film 10. The
plurality of first electrodes 12 are provided on one surface of the piezoelectric film 10 and are
separated from each other. The vibrating region A of the piezoelectric film 10 changes depending
on which first electrode 12 the drive signal is input to. When the vibrating area A changes, the
resonance frequency changes. The carrier wave of the parametric speaker is often set to the
resonance frequency of the oscillation source. Therefore, according to the present embodiment,
the directivity of the parametric speaker can be changed depending on the usage scene. [Selected
figure] Figure 1
Display device and electronic device
[0001]
The present invention relates to a display device and an electronic device.
[0002]
One of the speakers is one which utilizes a piezoelectric element fixed on a vibrating member as
an oscillation source.
09-05-2019
1
This type of speaker is characterized in that it is easy to miniaturize as compared with an
electrodynamic speaker using a voice coil and a magnet. Such a speaker may be incorporated
into an electronic device having a display, such as a mobile communication terminal, for example.
[0003]
Patent Document 1 describes that a piezoelectric film is incorporated into a polarization
assembly of a display, and the piezoelectric film is used as a speaker. The polarizing assembly is a
polarizing film disposed on a piezoelectric film.
[0004]
Patent Document 2 describes that a piezoelectric film is incorporated in a touch panel and the
piezoelectric film is used as a speaker.
[0005]
JP 2007-28641 JP JP 2007-66306 JP
[0006]
One of the speakers using a piezoelectric element is a parametric speaker using an ultrasonic
wave as a carrier wave.
Since ultrasonic waves are highly intentional, using a parametric speaker, it is possible to form a
sound field only in a specific direction, such as near the user.
[0007]
When considering mounting a parametric speaker in a portable electronic device, it is preferable
to be able to change the directivity of a parametric speaker according to a use scene.
09-05-2019
2
On the other hand, miniaturization is required of portable electronic devices. To this end, it is
desirable to incorporate parametric speakers into other components.
[0008]
An object of the present invention is to provide a display device and an electronic device that can
be used as a parametric speaker and can change directivity.
[0009]
According to the present invention, a display having a polarizing member having a piezoelectric
film, a polarizer layer formed on the piezoelectric film, and a plurality of electrodes provided on
one surface of the piezoelectric film and separated from each other An apparatus is provided.
[0010]
According to the present invention, an electronic device having the above-described display
device is provided.
[0011]
ADVANTAGE OF THE INVENTION According to this invention, it can be used as a parametric
speaker and can provide the display apparatus and electronic device which can change
directivity.
[0012]
It is a top view which shows the structure of the display apparatus which concerns on 1st
Embodiment.
It is sectional drawing which shows the layer structure of the display apparatus shown in FIG.
It is a figure explaining the effect of an embodiment.
It is a figure which shows the case where the polarization member shown to FIG.1 and FIG.2 is
connected to the control part.
09-05-2019
3
It is a top view of the electronic device which has a polarization member shown in FIG. It is
sectional drawing which shows the layer structure of a display display. It is a figure which shows
the structure of the polarization ¦ polarized-light member used for the display display which
concerns on 2nd Embodiment.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. In all the drawings, the same components are denoted by the same reference numerals,
and the description thereof will be appropriately omitted.
[0014]
First Embodiment FIG. 1 is a plan view showing a configuration of a display device according to a
first embodiment. FIG. 2 is a cross-sectional view showing the layer structure of the display
shown in FIG. The display device includes a polarization member 120. The polarizing member
120 includes the piezoelectric film 10, the polarizer layers 22 and 24, and the plurality of first
electrodes 12. The polarizer layers 22 and 24 are formed on the piezoelectric film 10. The
plurality of first electrodes 12 are provided on one surface of the piezoelectric film 10 and are
separated from each other.
[0015]
The directivity of ultrasound becomes better as the frequency is higher. For this reason, if the
frequency of the carrier wave of the parametric speaker is increased, the directivity of the
parametric speaker is enhanced. The carrier wave of the parametric speaker is often set to the
resonance frequency of the oscillation source.
[0016]
In the present embodiment, when a drive signal is input to the first electrode 12, the piezoelectric
09-05-2019
4
film 10 oscillates. And as shown to FIG. 3 (a) and (b), the area ¦ region A which vibrates among
the piezoelectric films 10 changes with which 1st electrode 12 a drive signal is input. When the
vibrating area A changes, the resonance frequency changes. Therefore, according to the present
embodiment, the directivity of the parametric speaker can be changed depending on the usage
scene. The details will be described below.
[0017]
The piezoelectric film 10 is formed of a resin material exhibiting piezoelectricity. This resin
material is, for example, polyvinylidene fluoride. However, the piezoelectric film 10 may be
formed of another resin material such as polyvinyl chloride, polytrifluoroethylene or the like.
[0018]
In the present embodiment, the first electrode 12 is formed on one surface of the piezoelectric
film 10, and the second electrode 14 is formed on the opposite surface of the piezoelectric film
10. The second electrode 14 has the same shape as the first electrode 12 and is disposed in the
same portion as the first electrode 12 in a plan view. The second electrode 14 may not be
divided, and may be a so-called solid electrode.
[0019]
The plurality of first electrodes 12 have the same planar shape, for example, a rectangular shape.
The first electrodes 12 are two-dimensionally arranged at equal intervals.
[0020]
On the piezoelectric film 10, the protective layer 32, the polarizer layer 22, the protective layer
34, the polarizer layer 24, and the protective layer 36 are laminated in this order. The protective
layers 32, 34, 36 are, for example, triacetyl cellulose. The polarizer layers 22 and 24 are, for
example, polyvinyl alcohol. However, the materials constituting these layers are not limited to
these.
09-05-2019
5
[0021]
FIG. 4 is a view showing a case where the polarization member 120 shown in FIGS. 1 and 2 is
connected to the control unit 50. As shown in FIG. The control unit 50 modulates audio data
input from the outside to generate modulation data for a parametric speaker, generates a drive
signal based on this data, and generates the first electrode 12 and the second electrode 14 of the
piezoelectric film 10. Enter in In the present embodiment, the control unit 50 inputs drive signals
to the plurality of first electrodes 12 and second electrodes 14 independently of each other. It
can be arbitrarily set to which first electrode 12 and second electrode 14 the control unit 50
inputs the drive signal.
[0022]
FIG. 5 is a plan view of an electronic device having the polarization member 120 shown in FIG.
The polarization member 120 is incorporated into the display 100. In the present embodiment,
the electronic device is a portable electronic device, such as a mobile communication terminal or
a portable game device. When the electronic device is a mobile communication terminal, the
electronic device may be configured in one case. In this case, the display 100 also has a touch
panel function. The electronic device may have a first housing having the display 100 and a
second housing having an input key. In this case, the electronic device may be a foldable type or
a slide type.
[0023]
FIG. 6 is a cross-sectional view showing the layer structure of the display 100. As shown in FIG.
The display 100 has a structure in which a light source 110, a polarization member 120, and a
liquid crystal panel 130 are stacked. The light source 110 may be a light emitting diode.
[0024]
As described above, according to the present embodiment, the directivity of the parametric
speaker can be changed depending on which first electrode 12 the drive signal is input to.
[0025]
09-05-2019
6
Second Embodiment FIG. 7 is a view showing a configuration of a polarization member 120 used
in a display 100 according to a second embodiment.
In the polarization member 120 according to the present embodiment, the planar shapes of at
least two first electrodes 12 are different from each other.
[0026]
Also according to this embodiment, the same effect as that of the first embodiment can be
obtained.
[0027]
Although the embodiments of the present invention have been described above with reference to
the drawings, these are merely examples of the present invention, and various configurations
other than the above can also be adopted.
[0028]
DESCRIPTION OF SYMBOLS 10 Piezoelectric film 12 1st electrode 14 2nd electrode 22 Polarizer
layer 24 Polarizer layer 32 Protective layer 34 Protective layer 36 Protective layer 50 Control
part 100 Display Display 110 Light source 120 Polarizing member 130 Liquid crystal panel
09-05-2019
7
1/--страниц
Пожаловаться на содержимое документа