JPH03116118

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DESCRIPTION JPH03116118
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
ferroelectric liquid crystal panel capable of emitting light as well as generating sound. [Prior Art]
The present applicant has proposed a piezoelectric element using a ferroelectric liquid crystal
and a conversion device using this piezoelectric element according to Japanese Patent
Application No. 63-217690. And the sound pressure characteristic is measured about the
example, and it is confirmed that it has a pronunciation function. Furthermore, the present
applicant refers to an electroluminescent device (hereinafter referred to as a rEL device) having a
sound generation function according to Japanese Patent Application No. 63-331207. ) Is
proposed. In this example, a ferroelectric liquid crystal panel is used as a sounding device, and an
EL element is formed on the back of the panel to have a light emitting function. In addition, EL
elements used as light emitting devices include a dispersion type (thick film type) and a thin film
type, and in the light emitting layer of the dispersion type EL element, electroluminescent
particles are mixed and dispersed in a transparent dielectric. It was a thing. [Solution 2i1 to be
solved] In such a conventional device, only the light emitting device and the sound emitting
device are superimposed, and each has a separate configuration, so the configuration is
complicated and it is difficult to reduce the size and thickness. It was also expensive. Therefore,
an object of the present invention is to provide a light emitting function to the ferroelectric liquid
crystal panel itself. [Means for Solving the Problems] In order to achieve the above object, a
ferroelectric liquid crystal panel according to the present invention comprises a pair of
substrates facing each other with a predetermined distance and facing each other. An orientation
layer provided on at least one opposing surface of the dividing plate, a ferroelectric liquid crystal
sealed between the two substrates, and electroluminescent particles mixed and dispersed in the
ferroelectric liquid crystal At least one of the substrates is a transparent substrate, and the
electrode provided on the transparent substrate is a transparent electrode. [Operation] When the
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voltage is applied to the electrode of the ferroelectric liquid crystal panel according to the
present invention, the electrostrictive effect of the ferroelectric liquid crystal is generated.
Further, by this voltage application, the electroluminescent particles mixed and dispersed in the
ferroelectric liquid crystal emit light. Embodiments of the present invention will be described
below with reference to the drawings. As shown in FIG. 1, a transparent electrode 2a such as ITO
is formed by a method such as vapor deposition on one substrate la made of transparent glass or
the like. Then, on the transparent electrode 2a, a transparent insulating layer 3a such as SiO 2
and an alignment film 4a such as polyimide are laminated. The other substrate is also the same,
and a transparent insulating film 3b such as SiO2 and an alignment film 4b such as polyimide are
laminated and formed on a transparent electrode 2b such as ITO provided on a glass substrate
1b.
Next, the pair of substrates 1a and 1b are arranged such that the alignment films 4a and 4b face
each other with a fixed gap, and the ferroelectric liquid crystal 6 is sealed in the gap between
both alignment films. It is sealed by As the ferroelectric liquid crystal 6, ZLI-3774 (manufactured
by Merck & Co., Ltd.) or the like is used. In advance, electroluminescent particles 7 such as zinc
sulfide (ZnS) are mixed and dispersed therein. The alignment films 4a and 4b are subjected to
alignment processing such as rubbing, and the ferroelectric liquid crystal 6 sealed in the gap is in
the homogeneous alignment state. When an alternating voltage is applied between the picture
electrodes 2a and 2b of the ferroelectric liquid crystal panel configured as described above, the
entire panel vibrates due to the electrostrictive action of the ferroelectric liquid crystal 6, and the
sound generation according to the applied voltage frequency is performed. Do. When an
alternating voltage is applied, the electroluminescent particles 7 in the ferroelectric liquid crystal
6 emit light. The sound pressure level of the sound and the luminance of the light emission
change with the applied voltage frequency. The graph shown in FIG. 2 shows that the voltage is
applied to the panel of the above-mentioned configuration to change the frequency of this
voltage, and the front of the panel 1. It represents the result of measuring the sound pressure
level at the position of 5 cm. According to this, the sound pressure level is as low as about 65 to
70 dB up to a frequency of about 600 Hz, rises sharply at frequencies higher than that, reaches a
maximum of 90 dB or more at about 6 KHz, and falls gently above 10 KHz. The light emission
luminance rises gently up to about 200 Hz, but it is stable at 30 cd / resistance in the range of
about 200 Hz to 2 KHz, and has a maximum value of about 40 cd / rr at about 3 KHz? It
decreases rapidly after that. Therefore, by setting the applied voltage frequency to about 2 to 3
KHz, light emission and sound generation can be performed simultaneously. In addition, since the
sound pressure level and the curve of the brightness ¦ luminance are shifted, it is also possible to
perform only any one by selecting a frequency. For example, light emission can be performed
only by applying a voltage of 500 Hz, and only sound generation can be performed by applying a
voltage of 10 to 20 KHz. As described above, by selecting the frequency of the applied AC voltage
according to the sound generation and light emission characteristics, one or both functions can
be performed at the same time, or the degree of the sound generation and light emission can be
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controlled. This panel is effective for raising attention in both light emission and sound
generation when used for alarm clocks of alarm clocks and in-car warning lights of cars, etc.
Simultaneous messages with light and sound can be made especially in a dark place or at night
Since the light emission source and the sound generation source are the same, the message
location can be easily confirmed.
Although both of the picture electrodes 2a and 2b are transparent electrodes in the above
embodiment, any one of the electrodes may be a metal electrode and an opaque electrode. For
example, when the electrode 2b is a metal electrode, light emitted from the light emitting
particles 7 is reflected by the metal electrode 2b, passes through the substrate 1a, emits light
only upward, and can increase the amount of light. Further, the electrode 2b is a transparent
electrode, and an opaque substrate is used as the substrate 1b, and the same effect can be
obtained by reflecting light by this substrate. Note that by making the electrode 2 b a metal
electrode and thickening this electrode, the substrate can be omitted and it can be used as an
electrode and a substrate. In this case, in order to electrically insulate, it is preferable to coat the
surface. In the above embodiment, the alignment films 4a and 4b are provided on both the
substrates 1a and 1b, but the alignment film may be provided on either one of the substrates.
Although the insulating layer is provided on both substrates 1a and 1b, the insulating layer may
be provided on only one of the substrates, or the insulating layer may be omitted if the alignment
film is insulating. [Effects of the Invention In the present invention, since the electroluminescent
particles are mixed and dispersed in the ferroelectric liquid crystal sealed between the substrates,
the ferroelectric liquid crystal panel itself simultaneously emits and emits light by applying a
voltage be able to. In addition, the degree of light emission and sound generation can be changed
by changing the applied voltage frequency, and only one of the functions can be performed.
Therefore, various uses can be made according to the purpose.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a ferroelectric liquid crystal panel according to an embodiment
of the present invention, and FIG. 2 is a graph showing the relationship between the applied
voltage frequency and the sound pressure level and the light emission luminance.
la, lb ··· Transparent substrate, 2a, 2b ··· Transparent electrode, 4a, 4b ··· Alignment film, 5 ···
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Sealing material, 6 ··· Ferroelectric liquid crystal, 7 ··· Electroluminescent particles. that's all
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