JP3101138B2 - Information display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy-saving information display device for displaying road information, and more particularly to an energy-saving information display device utilizing solar energy, for diffusing sunlight and taking uniform light into a housing. The present invention relates to an information display device.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No.
55970, JP-A-59-146084,
The one disclosed in Japanese Utility Model Laid-Open No. 4-119483 is known.

First, the display device disclosed in Japanese Patent Application Laid-Open No. 58-55970 is composed of a plurality of display units arranged in a matrix. Figure 1 shows each unit.
As shown in FIG. 0A, a magnetic reversing element 51 and an emission port 53 of an optical fiber 52 are provided vertically, and a lamp 55 and a reflection plate 5 are provided on the side of the entrance 54 of the optical fiber 52.
The light source 57 formed by 6 is allocated and provided for each of the plurality of optical fibers 52. The magnetic reversing element 51 has a reflecting surface on the front surface and a black surface on the back surface, and is formed in a disk-like shape rotatably supported by a shaft. Also, in the middle of the optical fiber 52, as shown in FIG. 10 (b), a character control unit 60 provided with a light-shielding plate 59 for turning on and off the electromagnet 58 to control the passage and cutoff of light has an inner surface. Is provided in a case 61 having a reflecting surface.

When the display is performed by this display device, in the daytime, the lamp 55 of the light source 57 is turned off, and only the magnetic reversing element 51 of the unit corresponding to the character has a reflection surface on the outer surface side of the display unit, and the other surface has a reflection surface. The rotation is controlled so that the outer surface side of the magnetic reflection element 51 becomes a black surface. In the nighttime, the lamp 55 of the light source 57 is turned on, and only the optical fiber 52 of the unit corresponding to the character allows light to pass therethrough.

Next, the display device disclosed in Japanese Patent Application Laid-Open No. 59-146084 has a display surface composed of a large number of display units arranged in a matrix as shown in FIG. The display unit is a frame 65 having an open front.
, An emission port 67 of an optical fiber 66 as a light emission part disposed inside the frame 65, a shutter 68, and a stopper 69. Optical fiber 6
6 is a case where the entrance 70 is an optical fiber 6 of another display unit.
6 and are collectively disposed in front of the light source 71, and the light from the light source 71 is led out to the front opening of each unit. The outer surface of the shutter 68 is black with low reflectance, and
As shown in (b), a support shaft 72 located in front of the exit 67 of the optical fiber 66 and provided slightly above the center.
Are rotatably supported on both side surfaces of the frame 65. As shown in FIG. 11B, the shutter 68 has a lower portion below the support shaft 72 forming a light blocking portion for blocking light from the exit 67 of the optical fiber 66, and an upper portion above the support shaft 72 as the frame 65.
Is formed as a locking portion for locking to a stopper 69 fixed to the upper surface of.

When a display is performed by this display device, in the display unit to be a dark part, the coil of the electromagnet is not energized and the light from the exit 67 of the optical fiber 66 is blocked. In the display unit to be a bright portion, the coil of the electromagnet is energized to magnetize the iron core, and the locking portion of the shutter 68 is locked to the stopper 69 to rotate to the horizontal state. Thereby, the exit 6 of the optical fiber 66
Light is emitted from 7 and the display unit becomes bright. At this time, the shutter 68 serves as an eave to reflect sunlight and prevent the shutter 68 from directly hitting the exit 67 of the optical fiber 66.

Next, as shown in FIGS. 12 (a) and 12 (b), the display device disclosed in Japanese Utility Model Laid-Open Publication No. 4-119483 has a housing 75 and a display unit whose pattern is removed. Body 7
5, a synthetic resin plate 76 attached to the front of
6, a fluorescent plate 77 having an end face fitted thereto, a sunlight collecting window 78 provided on the upper surface of the housing 75, an artificial light source 79 provided in the housing 75, and a fluorescent plate which reflects sunlight or light of the artificial light source 79. And a light reflecting surface 80 attached to the inner wall of a housing 75 for irradiating the light 77.

When the display is performed by this display device, in the daytime, sunlight taken into the device from the upper surface of the housing 75 is diffused through the light reflecting surface 80 to the entire inside of the housing 75. To irradiate the fluorescent screen 77. At night or on a cloudy day, the artificial light source 79 is turned on using a rechargeable battery charged by a photoelectric conversion panel for converting sunlight into electricity to illuminate the fluorescent screen 77.

[0009]

However, FIG.
Also, in the display device shown in FIG. 11, display is performed using direct reflection of sunlight, and therefore, there is a problem that display unevenness occurs on the entire or a part of the display surface depending on a weather state or a degree of exposure to sunlight. .

In the display device shown in FIG.
5 is diffused over the entire interior of the housing 75 by the light reflecting surface 80 provided on the inner wall of the housing 75 to illuminate and illuminate the fluorescent screen 77 with the light reflected from the upper surface of the housing 75. The brightness inside the housing 75 changes depending on the degree of light irradiation, and the surrounding brightness directly affects the display, so that there is a problem that display unevenness easily occurs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an information display device capable of efficiently introducing sunlight according to ambient brightness such as weather. Is to do.

[0012]

In order to achieve the above object, an information display device according to claim 1 of the present invention has an upper surface (1).
a) a housing having an opening (2) for taking in sunlight into a), and a solar light introduction plate (3) disposed in the opening.
A reflecting plate (9) for reflecting sunlight passing through the sunlight introducing plate to the front side (1b) of the housing; and a reflecting plate provided on the front side of the housing to correspond to the dots on the display surface. An information display device comprising: a display section (11) having a shutter mechanism (10); and a control section (20) for controlling a shutter mechanism of the display section based on display information, wherein the sunlight introducing plate is Liquid crystal, electrochromic, photochromic electronic device that electrically controls the amount of sunlight taken in, the control unit, when a device abnormality occurs, the electronic device, sunlight It is characterized in that control is performed so as to prohibit the introduction of.

[0013]

[0014]

The sunlight is diffused by the milky white sunlight introducing plate disposed in the opening on the upper surface of the housing, and is taken into the housing as uniform light. Thereby, even in fine weather, the brightness of the entire inside of the housing is kept uniform. The light taken into the housing via the sunlight introducing plate is reflected by the reflector on the front side of the housing, on the display unit having a shutter corresponding to the dot. Then, the control unit controls the shutter of the display unit based on the display information, and causes the display unit to display desired character information.

Further, the sunlight introducing plate is constituted by any electronic device of liquid crystal, electrochromic or photochromic instead of the milky white plate, and the amount of passing sunlight can be electrically controlled. If any abnormality occurs in the apparatus, the surface can be controlled to be black and the introduction of sunlight can be prohibited.

[0016]

1A is a perspective view showing the appearance of an information display device to which a light introducing plate according to the present invention is applied, FIG. 1B is a side view of the device, and FIG. 2A is the device. 2B is a partially enlarged front view of a display plate and a shutter mechanism constituting the display surface of FIG. 2, and FIG. 2B is an enlarged side view of the same.

A sunlight introducing plate 3 for allowing sunlight to pass through the inside of the housing 1 is detachably provided in an opening 2 formed on the upper surface 1a of the cubic housing 1 having an outer shape.
The sunlight introducing plate 3 is made of a milky white resin plate, and instead of simply changing the transparency, by using a colored plate, the sunlight is diffused, and even in the case of fine weather,
The brightness of the entire inside of the housing 1 is kept uniform.

When the sunlight introducing plate 3 is made of a milky white resin plate, it is not necessary to make it milky white and opaque depending on the surrounding brightness. Therefore, an electrically switchable liquid crystal is used instead of this resin plate. The sunlight introducing plate 3 may be configured by a display device (electronic device) such as a display, an electrochromic display, or a photochromic display that can be changed by ambient brightness.

Here, the configuration of these display devices will be briefly described. A liquid crystal display is a liquid crystal display in which liquid crystal is sandwiched between two opposing glass plates, and an image is displayed on the inner surface of each of the glass plates. Electrodes are formed, and these electrode groups are electrically connected to external terminals.

A typical operation mode of this type of liquid crystal display is roughly classified into a nematic phase and a collective phase based on the arrangement state of liquid crystal molecules, and the neotic phase utilizes rotation of molecules by an external voltage. Due to the dielectric effect of controlling the amount of transmitted or reflected light in combination with an object or a polarizing plate, due to the dynamic scattering effect scattered by electrohydrodynamic instability with voltage, and the rotating effect of a polychromatic dye accompanying the rotation of liquid crystal molecules There is one due to the guest-host effect using.

The collective phase includes a change in selective scattering wavelength in visible light, a change in transmittance between a planar structure and a vocal conic structure, and a dielectric effect utilizing polarization between a cholesteric phase and a nematic phase. By,
There are a change in selective scattering wavelength in visible light, a change in transmittance due to heating and cooling, and a thermal effect using erasing by an AC electric field.

In an electrochromic display, a substance in the system undergoes an oxidation / reduction reaction due to electric energy applied to the system, and the electronic state of an oxidation product or a reduction product (in some cases, both) is in a visible region. It is constructed by applying the principle that light changes to one having a transition probability different from 0.

A photochromic display is a substance in which a borosilicate-based or aluminophosphate-based chemical composition is melted and AgCl crystals are precipitated by a heat treatment. It utilizes the properties of glass that returns to its original transparent state when stopped.

A display panel 4 having a black surface is provided on the front surface 1b of the housing 1. As shown in FIG.
As shown in (a) and (b), a plurality of through-holes 5 forming dots are formed in a matrix. More specifically, the through-hole 5 can provide a sufficient contrast without causing halation between the adjacent through-holes 5 and 5, and furthermore, a shutter plate 12 in a shutter mechanism 10 described later.
In order not to hinder the opening and closing of, for example, it is formed regularly at a center interval of 30 mm at a diameter of 20 mm, for example, 16 ×
It comprises 16 dots.

On the front surface of the display panel 4, a cover member 4a having a light-transmitting property for preventing intrusion of rain from outside and mixing of dust is attached. This cover member 4a
At least the portion facing the through hole 5 allows sunlight to pass therethrough.

A light source 6 and a solar battery 7 are provided at a position on the rear side of the display panel 4 where display is not hindered. More specifically, the light source 6 is provided along the depth direction on both inner wall surfaces 1d, 1d of the housing 1 below the sunlight introducing plate 3, and is, for example, a fluorescent lamp, a light bulb, a plasma light emitting element, an EL (Electro Luminescence). It is composed of The solar battery 7 charges sunlight passing through the sunlight introducing plate 3 in the daytime, and the charged power is used as a driving power source for each unit when driving a shutter mechanism 10 described later. It is also used as a power source for driving the light source 6 at night. The solar battery 7 may be provided inside or outside the housing 1.

At the periphery of the front surface 1b of the housing 1, there is provided an eave 8 which protrudes forward from the upper side and slopes down on both sides so as to block direct light of sunlight on the display surface. I have.

From the upper end of the rear surface 1c to the lower end of the front surface 1b inside the housing 1, a flat reflecting plate 9 inclined at 45 ° with respect to the display plate 4 is provided. The surface of the reflection plate 9 is subjected to a pear finishing treatment to form fine irregularities,
Display panel 4 by diffusing sunlight passing through solar panel 3
Leading to the side. Note that both inner wall surfaces 1d, 1d inside the housing 1 in which the reflection plate 4 is disposed also form a reflection surface.

The display plate 4 is provided with a shutter mechanism 10 for opening / closing the through holes 5 and passing / blocking the light guided from the reflection plate 9 for each through hole 5. Shutter mechanism 1
0 constitutes the display unit 11 together with the display plate 4,
Each of the through holes 5 is alternately attached to the front and back surfaces of the display plate 4, and includes a shutter plate 12 and a shutter driving unit 13.

As shown in FIG. 2 (a), the shutter plate 12 is formed in a circular shape slightly larger than the through hole 5, and is provided with a display plate 4 through a bar-shaped mounting piece 12a integrally formed. It is pivoted on. The shutter plate 12 has an axis 12b.
Is rotatable in parallel with the display panel 4 so as to cover the through hole 5 around the center, and the surface of the portion covering the through hole 5 is colored black. A permanent magnet 14 having one surface magnetized to the N-pole and the other surface magnetized to the S-pole is provided at the center of the end of the mounting piece 12a for fixing the shutter plate 12 to the display panel 4.
Is erected and fixed.

As shown in FIG. 2A, the shutter driving unit 13 includes an L-shaped coiled magnetic material 15 for driving the opening and closing of the shutter plate 12 with respect to the through hole 5 and a Z-shaped auxiliary magnetic material. 16 and two magnetic members.
The magnetic material 15 with a coil includes a base 15a to which the coil 17 is attached, and a fixed piece 15 extending from one end of the base 15a.
b, the tip of which is bent at 90 ° from the other end of the base 15a and L
And an extension piece 15c formed in a character shape.

The auxiliary magnetic material 16 includes a base 16a perpendicular to the base 15a of the magnetic material 15 with a coil, a fixed piece 16b which is bent at 90 ° from one end of the base 16a, and a fixed piece 1b.
A bent extension piece 16c which is bent 90 ° from the other end of the base 16a in a direction opposite to that of the base 6b and is bent upward from the base and lifted.
And is constituted by.

The coiled magnetic material 15 and the auxiliary magnetic material 16 are fixed to the display plate 4 via a spacer 18 with screws or the like in a state where the fixing pieces 15b and 16b are overlapped (not shown).
It is fixed by. As a result, a gap 19 is formed at the upper end side of the coil 17 at a portion surrounded by the extension piece 15c of the coiled magnetic material 15 and the bent extension 16c of the auxiliary magnetic material 16, and a kind of magnetism is formed. A loop circuit is formed.

The axis 12 which is the center of rotation of the shutter plate 12
b is located at the center of the gap portion 19 on the side of the extension piece 15c of the magnetic material with coil 15 and includes two magnetic members 15 and 16;
Is disposed on a line L2 orthogonal to a line L1 connecting the center of the through hole 5 and the rotation center of the shutter plate 12.

In the initial state, if the coil 17 is not energized in the initial state, as shown in FIG. 4A, the magnetized surface of the permanent magnet 14
The shutter plate 12 closes the through hole 5 by being sucked by the distal end portion 15ca of the 5c and facing the inner surface of the distal end portion 15ca. Further, the bent extension piece 16c of the auxiliary magnetic material 16 is
As shown in FIG. 2 (b), the shutter plate extends close to the upper surface of the distal end 15ca of the extension piece 15c of the magnetic material 15 with a coil, avoiding above the permanent magnet 14, and extends around the axis 12b. 12 is positioned so as not to hinder movement when rotated.

The above-described shutter drive unit 13 magnetizes the two magnetic members 15 and 16 according to the direction of the current flowing through the coil 17 when the coil 17 is energized by a control signal from a control circuit (control unit) 20. Thus, the opening and closing of the shutter plate 12 with respect to the through hole 5 is driven.

FIG. 3 is a block diagram of a control circuit 20 for controlling the shutter driving section 13.
Comprises a communication control unit 21, a switching unit 22, a character development unit 23, a dot data storage unit 24, a dot data comparison unit 25, and a display output unit 26.

The communication control unit 21 is used when the sunlight introducing plate 3 is composed of a display device such as a liquid crystal display, an electrochromic display, or a photochromic display, in addition to the character information indicating the display contents by radio from outside. The switching information for arbitrarily switching the color depth of the display device is received.

A signal from a dimming sensor 27 composed of, for example, a photodiode and a phototransistor is input to the switching unit 22, and the sunlight introducing plate 3 is connected to a liquid crystal display, an electrochromic display, a photochromic display, or the like. When the communication control unit 21 is configured by a display device, the communication control unit 21 receives the switching information and the light control sensor 2.
The display device is controlled to switch to a desired color density based on the signal 7.

The character developing section 23 converts the character information received by the communication control section 21 into dot data developed on a matrix corresponding to the number of through holes 5 (for example, 16 × 16) for each character. ing.

The dot data storage section 24 includes a current display memory 24a and a change display memory 24b. The current display memory 24a stores dot data of a character currently displayed. Also, the change display memory 24
b stores the dot data of the character displayed this time developed by the display developing unit 23. Each time a new display is performed, the dot data stored at that time is rewritten to the current display memory 24a. It is supposed to be.

The dot data comparing section 25 compares the current dot data stored in the current display memory 24a with the current dot data stored in the change display memory 24b, and determines whether the current dot data does not overlap with the current dot data. The dot data is output to the display output unit 26.

The display output unit 26 includes a dot data comparison unit 2
The shutter drive unit 13 corresponding to each dot data is sent as a control signal to the coil 17 so that only the shutter plate 12 corresponding to the current dot data which does not overlap with the current dot data input from the unit 5 is opened and closed. A shutter open signal or a shutter close signal for energizing is output.

Next, the opening and closing operation of the shutter mechanism is shown in FIG.
A description will be given based on (a) to (c) and FIGS. 5 (a) to (c). It is assumed that the right side surface of the permanent magnet 14 in the figure is magnetized to the N pole and the left side surface is magnetized to the S pole.

First, the opening operation of the shutter mechanism is shown in FIG.
Explaining based on (c), the N pole surface of the permanent magnet 14 is attracted to the tip 15ca of the extension piece 15c of the coiled magnetic material 15 in an initial state where the coil 17 is not energized. Thus, the permanent magnet 14 is attracted and held at a position facing the inner surface of the distal end portion 15ca, and the shutter plate 12 closes the through hole 5 (FIG. 4A).

In this state, when a shutter opening signal from the control circuit 20 is input to the shutter drive unit 13 and the coil 17 is energized, the magnetic material 15 with the coil becomes the N pole and the auxiliary magnetic material 16 becomes the S pole. Each is magnetized. As a result, the N-pole surface of the permanent magnet 14 repels the N-pole magnetic material 15 with a coil, and rotates to a position 45 ° away from the through hole 5 about the axis 12b (FIG. 4B).

Subsequently, the S-pole surface of the permanent magnet 14 is attracted to the N-pole coiled magnetic material 15 and rotates around the axis 12b to a position 90 ° away from the through hole 5 (FIG. 4).
(C)). At this time, the S pole surface of the permanent magnet 14 is attracted to the inner surface of the base end portion 15cb of the extension piece 15c, and the shutter plate 1
2 is held at a position 90 ° away from the through hole 5.

Next, the closing operation of the shutter mechanism will be described with reference to FIG.
A description will be given based on (c). When the shutter closing signal from the control circuit 20 is input to the shutter drive unit 13 and the coil 17 is energized in the state of FIG. The magnetic material with coil 15 is magnetized to the S pole, and the auxiliary magnetic material 16 is magnetized to the N pole. As a result, the S pole surface of the permanent magnet 14 becomes S
It repels the magnetic material 15 with the coil of the pole and rotates around the axis 12b to a position approaching the through hole 5 by 45 ° (FIG. 5).
(B)).

Subsequently, the N-pole surface of the permanent magnet 14 is attracted to the magnetic material 15 with the S-pole coil, and rotates around the axis 12b to a position where the entire through hole 5 is closed (FIG. 5C).
At this time, the N pole surface of the permanent magnet 14 is attracted to the inner surface of the distal end portion 15ca of the extension piece 15c, and the shutter plate 12 is held at a position that covers the entire through hole 5.

As described above, in the information display device provided with the shutter mechanism 10 described above, the shutter for the through hole 5 is utilized by utilizing the repulsion and attraction of the permanent magnet 14 to the coiled magnetic material 15 when the coil 17 is energized. The plate 12 is opened and closed. That is, the first 45 ° rotation is performed by the repulsion of the permanent magnet 14 against the coiled magnetic material 15, and the subsequent 45 ° rotation is performed by the coiled magnetic material 15.
By the attraction of the permanent magnets 14. The holding of the shutter plate 12 at the position that closes the through hole 5 or at a position that is 90 ° away from the through hole 5 utilizes the attraction of the permanent magnet 14 to the coiled magnetic material 15 without energizing the coil 17. doing.

In the information display apparatus described above, the housing 1 that forms one character by 16 × 16 dots is defined as one unit, and as shown in FIG. 6, a plurality of (seven in the illustrated example) housings 1 are used. It is configured by continuous arrangement. In this case, there is no gap between the housings 1, and instead, the light source 6 is provided along the depth direction, and when the light source 6 is driven, the display unit 11 is illuminated from both sides. Then, by transmitting light through the through hole 5 in which the shutter plate 12 is open, arbitrary character information such as “No traffic during construction” as shown in FIG. 7 is displayed by a wireless command. When night display is performed, the light source 6 is driven by electric power from the solar battery 7 instead of sunlight. And the display unit 1
1 is irradiated from the back side to open the shutter plate 12 of the through hole 5 corresponding to the dot of the character information to allow light to pass therethrough.

According to the information display device of the embodiment described above, the following effects can be obtained. First, the upper surface 1a of the housing 1
Sunlight is reflected from the front surface 1b side of the housing 1 by the reflection plate 9 and the through hole 5 forming a dot is inserted into the shutter mechanism 10
Therefore, the display can be opened and closed to pass and block sunlight, so that display unevenness due to direct sunlight can be reduced and a desired free pattern can be displayed.

The shutter mechanism 10 is provided alternately for each through hole 5 on the front and back surfaces of the display panel 4. A shutter plate 12 for opening and closing the through hole 5 forming a dot is parallel to the display panel 4. Because of the moving configuration, it is possible to perform a detailed display by setting the pitch of the through-holes 5 narrow without narrowing the viewing angle unlike the related art. In addition, since the size of the housing 1 in the depth direction can be reduced, the overall size of the device can be reduced, and the plurality of display plates 4 can be mounted such that the positions of the through holes 5 are aligned as shown in FIG. 1 in the depth direction, and each shutter plate 12 is constituted by a color filter of, for example, red, blue, green, black, etc., and is arbitrarily opened and closed, so that a multi-color free pattern display can be performed.

Since the housing 1 is provided with a solar battery 7 for charging sunlight during the day, there is no need to provide a separate power supply, and the power is used to drive the light source 6 and the shutter mechanism 10 at night. Can be used.

Since the display command is configured to be remotely operated wirelessly from the outside, an independent display device can be provided. Even in a mountainous area where electricity does not pass, sunlight is used in the daytime and the solar battery 7 is used in the nighttime. The desired display can be performed by driving the light source 6 with the power charged to the light source 6.

Power is supplied to the coil 17 of the shutter drive unit 13 only when the shutter plate 12 is opened and closed. When the coil 17 is not energized, the shutter plate 12 is attracted and held by the permanent magnet 14. Power consumption can be reduced, energy can be saved, and even at nighttime display, it is possible to operate sufficiently with the electric power charged by the solar battery 7.

At the time of display, the opening and closing of the shutter plate 12 is controlled only for the through hole 5 corresponding to the current dot data which does not overlap with the current dot data.
Opening and closing of the shutter plate 12 can be suppressed to a necessary minimum, and energy can be saved.

Since the sunlight introducing plate 3 is opaque due to the milky white resin plate, even when the weather is fine, for example, the sunlight passing through the inside of the housing 1 becomes uniform, and the sky state is surely prevented from appearing on the display surface. can do.

When the sunlight introducing plate 3 is constituted by an electronic device such as a liquid crystal display, an electrochromic display, and a photochromic display, the amount of sunlight that has been taken in can be electrically controlled according to the ambient brightness such as weather. It can be controlled and is not mechanical control like the shutter mechanism 10 described above, so that the reliability is improved, and even if an abnormality occurs in the device such as the shutter mechanism 10 does not operate normally, the sunlight introducing plate 3 By prohibiting the introduction of sunlight by controlling black, erroneous display can be prevented.

Since the surface of the reflection plate 9 is formed with fine irregularities by the pear treatment, unevenness of the sunlight introduced through the sunlight introduction plate 3 on the display surface can be reduced. Further, since the reflection plate 9 is disposed at an angle of 45 ° with respect to the display surface of the display unit 11, the sunlight taken in through the sunlight introduction plate 3 can be substantially entirely covered with the sunlight. Can be reflected.

Incidentally, in the above-described embodiment, the reflection plate 9
Is described as a flat plate inclined at 45 ° with respect to the display plate 4. However, as shown in FIG. Can be further reduced to uniformly reflect over the entire surface of the display unit 11, and the size of the housing 1 in the depth direction can be reduced to reduce the size of the entire apparatus.

In the above-described embodiment, the display unit 11 is constituted by the shutter plate 12 and the shutter driving unit 13 and the opening and closing of the shutter plate 12 with respect to the through holes 5 forming dots is controlled to perform a desired display. As explained, the display unit 1
If the device 1 is composed of, for example, a liquid crystal display, an electrochromic display, an electro-optic ceramic (PLZT) shutter, etc., the dot interval becomes narrower as compared with the device using the above-described shutter mechanism 10, and a more detailed pattern display can be performed. Can be.

Here, the PLZT shutter has a structure in which a polarizer and an analyzer are disposed on both sides of a PLZT made of a ceramic material, and linearly polarized light is elliptical due to a birefringence effect generated by applying a voltage to the PLZT. The light is converted into polarized light and intensity-modulated through a polarizer to obtain an optical output.

Further, in the above-described embodiment, the configuration in which the display is performed by using the radio command or the solar battery 7 has been described. However, the configuration may be such that the display is performed by wire using an external commercial power supply.

[0065]

As described above, the information display device according to the present invention is capable of electrically controlling the amount of sunlight taken in according to the surrounding brightness such as the weather, for example, liquid crystal, electrochromic, photochromic, etc. Because the electronic equipment is used for the solar panel, the reliability is improved compared to mechanical control, and when the equipment does not operate normally due to some abnormality of the equipment, the electronic equipment is controlled. In addition, the introduction of sunlight can be prohibited to prevent erroneous display.

[0066]

[Brief description of the drawings]

FIG. 1A is a perspective view showing an appearance of an information display device to which a light introducing plate according to the present invention is applied. FIG. 1B is a side view of the device.

FIG. 2 (a) is a partially enlarged front view of a display plate and a shutter mechanism constituting a display surface of the device, and (b) is an enlarged side view of the same.

FIG. 3 is a block diagram of a control circuit for driving a shutter mechanism of the apparatus.

FIGS. 4A to 4C are views showing an opening operation of a shutter mechanism in the apparatus.

FIGS. 5A to 5C are views showing a closing operation of a shutter mechanism in the apparatus.

FIG. 6 is a perspective view showing the appearance of an information display device including a plurality of units.

FIG. 7 is a diagram showing an example of a display state by the device.

FIG. 8 is a view showing another embodiment of the reflection plate by the apparatus.

FIG. 9 is a side sectional view showing an embodiment in which display panels of the same device are stacked and arranged.

10A and 10B are diagrams showing an example of a conventional information display device using a magnetic reversal element.

11A and 11B are diagrams showing an example of a conventional information display device including a shutter driven by an electromagnet.

12A and 12B show an example of an information display device using a photoelectric conversion panel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Opening, 3 ... Sunlight introduction board, 4 ... Display board,
5 through-hole, 9 reflector, 10 shutter mechanism, 11
Display unit, 12: shutter plate, 13: shutter drive unit, 2
0: Control circuit.

Continuation of the front page (56) References JP-A-5-297813 (JP, A) JP-A-4-336517 (JP, A) JP-A-52-31718 (JP, A) JP-A-56-42266 (JP) JP-A-2-66288 (JP, A) JP-A-4-252730 (JP, A) JP-A-5-147983 (JP, A) JP-A-5-232885 (JP, A) 57-100774 (JP, U) Fully open 1979-8996 (JP, U) Fully open 1983-157376 (JP, U) Fully open 1986-94882 (JP, U) Fully open 1986-180385 (JP, U) U) Japanese Utility Model Hei 3-43687 (JP, U) Japanese Utility Model Showa 50-30682 (JP, U) Japanese Utility Model Utility Model Showa 60-107886 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) ) G09F 9/00 G09F 9/30-9/46 G09F 13/00-13/46

Claims (1)

(57) [Claims] 1. A housing (1) having an opening (2) for taking in sunlight on an upper surface (1a);
And solar introducing plate (3), a reflector for reflecting <br/> sunlight that has passed through the solar light introducing plate on the front side (1b) of the housing
(9) A display unit provided with a shutter mechanism (10) provided on the front side of the housing and corresponding to the dots on the display surface.
(11) a shutter for the display unit based on the display information;
Information display device comprising a control unit (20) for controlling a mechanism
A is, the solar light introduction plate, electrical passage of sunlight taken
Liquid crystal, electrochromic, photochromic
And the control unit is configured to control the electronic device when a device abnormality occurs.
An information display device for controlling the introduction of sunlight .