JP2000305498A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device facilitating to visually check a display part by always lightening it. SOLUTION: This display device is mounted with a light storage part 22 in a display part 13 of a bus signpost 11, and a cathode-ray tube 18 for a light source is arranged to be turned on intermittently on the back of the light storage part 22. When irradiated with solar light, etc., the light storage plate 24 constituting the light storage part 22 stores the optical energy as another energy, and converts the energy to emit light when the solar light, etc., are lost. The bus signpost 11 stores energy in the light storage plate 24 in the daytime. Immediately when the cathode-ray tube 18 is turned on and starts brightly lighting the display part 13 after sunset, energy is stored in the light storage plate 24. After the cathode-ray tube 18 is turned off, the display part 13 is brightly lighted by the emission of the light storage plate 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device installed at, for example, a bus stop and used as a bus sign for displaying a bus timetable.

[0002]

2. Description of the Related Art Conventionally, as this type of display device, a bus sign installed at a bus stop and displaying a bus timetable is known. This bus sign is composed of, for example, a pair of pillars that stand vertically from the ground, and a rectangular display plate attached between the pillars. A bus timetable or the like is displayed on one or both sides of the display panel.

[0003] Further, the bus sign is provided with lighting means so that the bus driver can easily visually recognize the position of the bus sign even at night and make it easier for passengers to see the bus timetable. As the illumination means, for example, an illumination light installed on the upper portion or a side edge of the display panel and illuminating the entire bus sign,
A light storage plate that emits light when irradiated with light is exemplified.

[0004] The phosphorescent plate is formed by dispersing a phosphorescent pigment in an acrylic resin or the like and molding it into a plate shape. When the light-storing pigment is irradiated with light for a predetermined time, the near-ultraviolet rays included in the light energy are stored as other energy, and after the light source is removed, the energy is converted into light to emit light. A display plate using a light storage plate has a function of storing energy in the daytime by sunlight or the like and emitting light by the stored energy after sunset to illuminate the display plate itself.

[0005]

However, a display panel using a phosphorescent plate emits light brightly immediately after light irradiation, but after the light irradiation is completed, the degree of the light emission increases with time. Becomes lower. Therefore, there is a problem that the display panel cannot always be displayed brightly at night, and it becomes difficult to visually recognize the display panel gradually.

The present invention has been made by paying attention to such problems existing in the prior art. It is an object of the present invention to provide a display device in which a display portion is always brightened so that the display portion can be easily viewed.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is provided on a display unit, and the light energy is stored as another energy by irradiating light, and the stored light energy is stored in the display unit. And a light source for emitting light to the light storage unit, and a power supply for turning on the light source. The outer surface of the light storage unit is used as a display surface.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a control means for controlling intermittent lighting of the light source. According to a third aspect of the present invention, in the first or second aspect of the invention, the light storage unit stores the light energy as another energy when the light source is turned on and when the external light source is irradiated, and When turned off, light is emitted by the stored energy.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the control means for controlling the intermittent lighting of the light source includes a lighting time and a lighting time which are set in advance. Storage means for storing a pattern,
The control means controls turning on and off of the light source based on the time pattern.

According to a fifth aspect of the present invention, in the first aspect of the invention, at least one of a solar cell and a commercial power supply is used as the power supply. The invention according to claim 6 is the invention according to any one of claims 1 to 5, further comprising a detection unit that detects the presence or absence of sunlight, and lighting of the light source is performed based on a detection result of the detection unit. It is started on the basis of.

According to a seventh aspect of the present invention, in the fourth aspect of the present invention, the time pattern repeatedly turns on and off the light source. According to the first aspect of the present invention, the outer surface of the light storage unit is illuminated brightly by the irradiation of the light storage unit from the light source, and the light energy at that time is stored as other energy in the light storage unit. Can be Further, when the light source is turned off, the outer surface side of the light storage unit is brightly illuminated by the light emission of the light storage unit. For this reason, the outer surface side of the light storage section as a display surface is illuminated brightly by its own light emission and the light source.

According to the second aspect of the invention, in addition to the operation of the first aspect of the invention, the light source is intermittently controlled by the control means. In the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, when illuminating from the light source and the external light source, the light storage unit stores the light energy as other energy. For this reason,
When there is no irradiation from the light source, the light storage unit emits light by the stored energy. Therefore, when the light source is turned off, the outer surface side of the light storage unit as a display surface is illuminated without using a power source, and power is saved.

[0013] In the invention described in claim 4, in addition to the operation of the invention described in any one of claims 1 to 3, the on time and off time of the light source are determined by the time pattern stored in the storage means. Is controlled by the control means based on Therefore, the light source can be turned on and off at a desired time.

According to the fifth aspect of the present invention, in addition to the function of the first aspect of the present invention, when a solar cell is used, the solar cell does not require a commercial power supply. In addition, the maintenance cost of the display device is reduced. In addition, when the solar battery and the commercial power supply are used together, and the solar battery cannot be used, the light source is turned on by the commercial power supply.

In the invention according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 5, the presence or absence of sunlight is detected by the detection means, and based on the detection result, Lighting of the light source is started. Thus, the light source is turned on automatically at the desired time.

In the invention described in claim 7, in addition to the effect of the invention described in claim 4, if intermittent lighting of the light source is repeated, the lighting time is shortened. In comparison, its power consumption is saved.
In addition, since the light energy of the light source is efficiently stored in the light storage unit as other energy, the display unit can be illuminated for a long time.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1 to 3, a pair of columns 12 constituting a bus marker 11 as a display device are formed in a columnar shape from a metal material, and are erected on a sidewalk of a bus stop or the like. A display portion 13 having a rectangular shape as viewed from the front is attached and fixed to the upper end side between the pair of columns 12.

The display unit 13 includes a main body case 14 formed of a metal material into a flat bottomed rectangular box shape, and the main body case 1.
And a door 16 made of a metal material that is openably and closably attached via a hinge 15 provided at one side edge of the opening 4.

As shown by the broken line in FIG.
A pair of electrodes 17 are provided on both upper and lower portions on the inner surface side of the device, and both ends of a cathode tube 18 as a light source are supported between the electrodes 17. In the present embodiment, an argon tube is used as the cathode tube 18. When used in an intermittently lit state, the cathode tube 18 is less likely to deteriorate compared to a fluorescent lamp, and can have a longer life. In addition, power consumption during lighting is low. Lead wires 19 are connected to the two electrodes 17, and they are connected to an inverter transformer 20 mounted at the lower end in the main body case 14.

As shown in FIGS. 1 and 3, the door 16 has a frame shape, and a panel 21 for forming a transparent display surface made of a synthetic resin material or the like is mounted in the frame. When the door 16 is closed, the main body case 14 is closed, and the panel 21 serves as a display surface to display a timetable or the like.

As shown in the dashed line in FIG. 2 and FIG. 3, a light storage section 22 having a square plate shape is accommodated in the main body case 14. The light storage unit 22 includes a light storage plate 24 and a print film 25 as a display unit disposed on the front side of the light storage plate 24. The light storage section 22 is immovably mounted in the main body case 14 by a plurality of claws 23 projecting inward from the main body case 14 at positions on both side edges of the main body case 14 facing each other.

The phosphorescent plate 24 is formed by uniformly dispersing a phosphorescent pigment in a translucent acrylic resin or the like and molding it into a predetermined shape. Luminescent pigment (trade name: N-Nightlight, manufactured by Nemoto Special Chemical Co., Ltd.) is a luminous phosphor containing strontium aluminate as a main component. When an external light source such as sunlight or a fluorescent lamp is irradiated for a predetermined time, the wavelength of the light is 200 nm to 45 nm.
The electrons of the luminous pigment are excited at 0 nm, and most excited by ultraviolet rays of 360 nm.

When the near-ultraviolet light energy is stored as another energy, that is, the light of the above-mentioned wavelength causes the electrons of the luminous pigment to be excited, and when this excited state is eliminated, for example, sunlight disappears. When converted to light, it emits light for a long time. In addition, since the electrons of the luminous pigment are excited by near-ultraviolet light, even in the case of cloudiness or rain, light energy of near-ultraviolet light is stored as energy in the excited state of the aforementioned electrons, and light is emitted when sunlight disappears. It has become.

The printing film 25 is formed of a transparent polyethylene terephthalate resin.
5, a bus timetable, a destination, and the like (not shown) are printed. The print film 25 is adhered to one surface of the light storage plate 24 with an adhesive or the like to be integrated with the light storage plate 24. Note that the print film 25 may be fixed on one surface of the light storage plate 24 by the claws 23 without being attached to the light storage plate 24. When light is irradiated on the light storage unit 22, the light is stored in the light storage plate 24. When the light irradiation is completed, the light storage plate 24 emits light and the light is transmitted to the print film 25.
Is transmitted through the transparent portion, and illuminates a timetable or the like.

As shown in FIGS. 1 and 2, a rectangular solar panel 27 is attached obliquely to the upper end of the main body case 14 via support columns 26, and is rotated by a rotating means (not shown). Solar panel 27 to support column 26
The rotation can be adjusted to the inclination angle of. On the surface of the solar panel 27, solar cells 29 as a plurality of thin-plate-like power sources are provided.
Is installed, and a solar cell 29, a supporting column 26 and a solar panel 27 constitute a panel section 28.

A rectangular parallelepiped housing case 30 is provided between the pair of columns 12 and below the display unit 13. As shown by a broken line in FIG. 2, a control device 31 serving as a control means is housed and fixed in the housing case 30, and a pair of batteries 32 are housed and fixed. The electric energy converted by the solar cell 29 is stored in a pair of batteries 32.

Then, power for lighting the cathode tube 18 is supplied from the battery 32, and the control device 31 controls turning on and off of the cathode tube 18. Cathode tube 1
Since the power consumption of the lamp 8 for lighting is lower than that of the fluorescent lamp, the operating time of the battery 32 can be extended as compared with the case where the fluorescent lamp is used. An advertising signboard 34 and the like are attached between the two columns 12 at a position below the storage case 30 by a pair of upper and lower attachment pieces 33.

Next, the electrical configuration of the bus sign 11 will be described. As shown in FIG. 4, a battery 32 is connected to the solar cell 29 and is charged by the solar cell 29, and a voltage detection circuit 35 is provided therebetween. Then, the voltage applied from the solar cell 29 to the battery 32 is detected by the voltage detection circuit 35. The remaining amount of the battery 32 is also detected by the voltage detection circuit 35. The voltage detection circuit 35 is connected to the control device 31, and the control device 31 is connected to a timer 36 that measures the lighting time and the light-off time of the cathode tube 18.

The battery 32 is connected to the inverter transformer 20 via a switch 37, and the inverter transformer 20 is connected to the cathode tube 18. The switch 3
Reference numeral 7 includes a switching transistor and the like.

The control unit 31 includes a CPU (Central Processing Unit) (not shown) and a ROM as a storage means. The ROM includes, as shown in FIG. A plurality of types of time patterns in which the lighting time and the lighting time are set are stored.

When the state where the detection value of the voltage detection circuit 35 has become equal to or less than the predetermined value has continued for a predetermined time, the control device 31 determines that the sunset has occurred, turns on the switch 37, and sets the cathode tube 1
8 is started. Then, this time is set as the lighting start timing of the cathode tube 18. In addition,
When the voltage detection circuit 35 detects that the charged amount of the battery 32 is equal to or less than the predetermined value, the control device 31 forcibly stops the power supply from the battery 32 to the cathode tube 18 in order to prevent the battery 32 from being over-discharged. Switch 37 is turned off. The mode switch 39 is connected to the control device 31 and can be switched between a normal mode in which program control is not performed and a mode having a time pattern corresponding to each season for performing program control.

As shown in FIG. 5, the time pattern includes a first mode, a second mode, and a third mode. In the case of the normal mode in which the time pattern is not set, the cathode tube 18 starts to be lit at a predetermined time (17:30 in this embodiment) by the timer 36, and continues to be lit as it is. It goes out later.

In the first mode executed by the program control, after the cathode tube 18 starts lighting at the above-mentioned lighting start timing, the lamp is turned on for 3.5 hours, and the intermittent lighting every 30 minutes is 3 hours.
It is set to be repeated times. Therefore, compared to the case where the cathode tube 18 is kept lit, the power consumption is reduced, and the display unit 1 is operated late at night compared to the normal mode.
3 can be illuminated.

In the second mode, the light is turned off 5 hours after the cathode tube 18 starts lighting at the lighting start timing. In the third mode, after the cathode tube 18 starts lighting at the lighting start timing, the lighting is performed for 4 hours, and the intermittent lighting is repeated twice every 30 minutes.

For example, if the second mode is selected in summer,
Since summer and sunset are later than spring, autumn and winter, the lighting start time of the cathode tube 18 is later than other seasons. Therefore, the cathode tube 18 can be kept lit until late at night. When each of the first and third modes is selected, the cathode tube 18 is turned on by intermittent lighting during the time period when it is expected that many bus passengers will gather at the bus stop, and during the time period when the bus passengers are expected to decrease. Light up,
Power consumption is reduced.

The lighting control of the cathode tube 18 is switched to the normal mode or the first to third modes by the mode changeover switch 39 so that the lighting time and the lighting time of the cathode tube 18 can be made to correspond to the season, weather, and the like. it can.

It is to be noted that the lighting time and the light-off time of the time patterns of the first to third modes shown in FIG. 5 exemplify a case where the lighting time and the light-off time are performed in a certain season. However, the present invention is not limited to this, since it changes depending on the situation. Further, the lengths of the lighting time and the turning-off time of the cathode tube 18 may be changed to arbitrary lengths.

Next, the operation of the bus marker 11 will be described. The case where the time pattern of the lighting time and the lighting time of the cathode tube 18 is set to the third mode shown in FIG. 5 will be described.

During the daytime, sunlight is irradiated on the solar cells 29 of the solar panel 27. In this state, the solar cell 2
9 converts sunlight into electric energy, and the electric energy is stored in a pair of batteries 32. At this time, the magnitude of the voltage applied to the battery 32 is detected by the voltage detection circuit 35, and the detected value is input to the control device 31. During the day, since the detected value is equal to or greater than the predetermined value, the control device 31 controls the switch 37 to be off. Therefore, the electric power stored in the battery 32 is not supplied to the cathode tube 18 but is stored in the battery 32.

After sunset, the light storage plate 24 converts the energy stored during the day into light and emits light, and the light storage unit 22 is illuminated brightly. Therefore, even if the area becomes dark, the display unit 13 can be easily visually recognized from the outside. Also, when the amount of irradiation of sunlight decreases, the magnitude of the voltage applied to the battery 32 by the solar cell 29 decreases. Then, when the voltage becomes equal to or lower than a predetermined value and the state continues for a predetermined time, the control device 31 determines that it is sunset and controls the switch 37 to be turned on.

Then, the battery 32 is connected to the cathode tube 18.
The supply of the electric power stored in the power supply is started, and the cathode tube 18 is turned on via the inverter transformer 20. As a result, light is emitted from the back side of the light storage unit 22, and the light storage unit 22 is illuminated brightly, so that the display unit 13 can be easily visually recognized, and the timetable and the like displayed on the display surface can be easily visually recognized. be able to. At the same time, the light energy of the cathode tube 18 is stored in the light storage plate 24 as other energy.

After the lighting of the cathode tube 18 is started, the timer 36 starts counting the lighting time. Then, as shown in FIG. 5, when four hours are measured by the timer 36, the control device 31 controls the switch 37 to be turned off based on the information, the supply of power from the battery 32 is stopped, and the cathode tube is stopped. 18 turns off.

While the cathode tube 18 is turned off, the energy stored in the light storage plate 24 by the irradiation of the cathode tube 18 is converted into light to emit light, and then the light storage unit 22 is illuminated brightly.
Next, after the cathode tube 18 is turned off, when the timer 36 measures 30 minutes, the control device 31 controls the switch 37 to be turned on, power is supplied from the battery 32, and the cathode tube 18 is turned on. Thereafter, intermittent lighting is performed according to the time pattern, and finally, the light is turned off.

As a result of the combination of the light storage plate 24 and the cathode tube 18 which is turned on in a time pattern, the cathode tube 1
By the irradiation of 8 and the light emission of the light storage plate 24, the display unit 13 is always displayed bright, and the bus driver can immediately recognize the position of the bus sign 11 from the outside. Also, the passenger waiting at the bus stop can easily visually recognize the timetable displayed on the display surface. Further, since the cathode tube 18 is controlled to be capable of intermittent lighting, the power used for lighting the cathode tube 18 is smaller than when the lighting is continued.

The effects exerted by the above embodiment will be described below. Since the cathode tube 18 is disposed on the back side of the light storage unit 22, the display unit 13 can be brightly illuminated by turning on the cathode tube 18. When the cathode tube 18 is turned off, the display unit 13 can be similarly illuminated by the light emission of the light storage plate 24 itself. Therefore, the display unit 13 can be constantly illuminated, and the visual recognition can be easily performed.

The cathode tube 18 is configured to be capable of intermittent lighting. Therefore, compared to the case where the cathode tube 18 is kept turned on, the rate of decrease of the charged amount of the battery 32 can be reduced, and the use time of the battery 32 can be prolonged. Therefore, the capacity of the battery 32 can be reduced, and the manufacturing cost of the bus marker 11 can be reduced.

When the cathode tube 18 is lit, the light storage plate 24 converts the light energy into another energy and stores it. Therefore, when the cathode tube 18 is turned off, the stored energy is converted into light to emit light and illuminate the display unit 13. Therefore, the display unit 1 can be used without using the battery 32.
3 can be illuminated, and the battery 32 can be used for a long time by slowing down the reduction rate of the charged amount.

Since the power stored in the battery 32 by the solar cell 29 is used as the power supply for the cathode tube 18, it is possible to eliminate the necessity of an electricity bill and to save energy. Further, unlike the case of using a commercial power supply, there is no need to perform wiring work or the like, and the work time for installing the bus sign 11 can be reduced.

The turn-on time and turn-off time of the cathode tube 18 are based on a time pattern set in the storage means so as to depend on the season and the daylight hours. Therefore, for example, it is possible to keep the lighting on in a time zone where many passengers and the like gather at the bus stop, and to shorten the lighting time in a time zone where the number of passengers decreases.

The lighting start timing of the cathode tube 18 is as follows.
The state is set when the state where the magnitude of the voltage applied by the solar cell 29 to the battery 32 detected by the voltage detection circuit 35 has become equal to or less than a predetermined value has continued for a predetermined time. Therefore, the cathode tube 18 can be turned on in response to sunset.

Since the intermittent lighting of the cathode tube 18 is repeated, the speed of consumption of the storage amount of the battery 32 is lower than the case where the cathode tube 18 starts lighting and turns off, and then turns on and turns off only once. And the time at which the cathode tube 18 is finally turned off can be extended. Further, since the light-off time of the cathode tube 18 is shortened, the cathode tube 18 is turned on while the light storage plate 24 is emitting light, and the display unit 13 can be illuminated brightly.

The present embodiment can be embodied with the following modifications. In the present embodiment, the display device 11 is embodied as a bus sign. However, the display device 11 may be applied to an indoor indicator light in a vehicle such as a train, an airplane, a ship, or used as a signboard or an interior light. May be. For example, the printed film 25 as a display means on one side of the light storage plate 24 is omitted, and the shape of the light storage plate 24 is changed to, for example, a star shape, a round shape, a triangular shape, and the display unit 13 is formed into a corresponding shape. May be used as a signboard. Also in the case of such a configuration, the display unit 13 can always be illuminated brightly by the irradiation of the cathode tube 18 and the light emission of the light storage plate 24 itself.

In the present embodiment, the display means is constituted by the print film 25. However, the display means may be constituted by directly writing on the light storage plate 24. In the case of such a configuration, the printing film 25 is omitted and the display device 1 is omitted.
1 can reduce the manufacturing cost.

In the present embodiment, the lighting of the cathode tube 18 is controlled based on the time pattern stored in the ROM. However, the time pattern is not used and the solar cell 29 detected by the voltage detection circuit 35 is not used. The cathode tube 18 may be turned on when the state in which the magnitude of the applied voltage becomes equal to or less than the predetermined value continues for a predetermined time, and thereafter, the lighting may be continued as it is. In the case of such a configuration, the storage means for storing the time pattern for intermittent lighting can be omitted,
The configuration of the display device 11 can be simplified.

In the present embodiment, the solar cell 29 is used as a power supply for lighting the cathode tube 18. However, as shown by a broken line in FIG. You may use together with the commercial power supply 38. In the case of such a configuration, for example, when the charged amount of the battery 32 is exhausted, the power source is switched to the commercial power source 38 to turn on the cathode tube 18, and the display unit 13 is illuminated by the irradiation and the light emission of the light storage plate 24 itself. You can always illuminate brightly.

In the present embodiment, the lighting start timing of the cathode tube 18 is determined when the magnitude of the voltage applied to the solar cell 29 detected by the voltage detection circuit 35 has become equal to or less than a predetermined value for a predetermined time. After setting, an optical sensor as a detecting means is connected to the control device 31 and the cathode tube 18 is connected.
May be performed by detection by an optical sensor. Alternatively, the panel unit 28 and the battery 32 may be omitted, the commercial power supply 38 may be connected to the inverter transformer 20, and an optical sensor may be connected to the control device 31.
In the case of such a configuration, at sunset, the irradiation amount of sunlight is lost, and the light sensor detects the irradiation amount, and the cathode tube 18 is turned on. Therefore, when the place where the bus sign 11 is installed becomes dark, the display unit 13 can be illuminated.

In the present embodiment, the lighting start timing of the cathode tube 18 is determined when the voltage applied to the solar cell 29 detected by the voltage detecting circuit 35 has continued for a predetermined period of time when the magnitude of the applied voltage has become equal to or less than a predetermined value. Although set, the lighting start timing and the time pattern in which the intermittent lighting is set may be stored in the storage unit, and the control device 31 may control the lighting start timing and the intermittent lighting of the cathode tube 18. Alternatively, the panel section 28 and the battery 32 may be omitted, the commercial power supply 38 may be connected to the inverter transformer 20, and the lighting start timing may be controlled by a time pattern. With this configuration, the cathode tube 18 can be turned on at a predetermined time.

In the present embodiment, the cathode tube 18 is intermittently lit based on the time pattern. However, the battery 32 is provided with a detecting means for detecting the remaining amount of the charged amount. When it is detected during the lighting that the remaining amount of the battery 32 is low, the control device 31 may control the cathode tube 18 to intermittently light.
With such a configuration, the use time of the battery 32 can be extended.

In the present embodiment, a human sensor is connected to the control device 31, and when a person approaches the bus sign 11, the switch 37 is turned on by the control device 31 based on the signal of the human sensor to turn on the cathode tube. Alternatively, the control device 31 may turn off the switch 37 based on the signal of the human sensor to turn off the cathode tube 18 when the person 18 is turned on. With this configuration, the cathode tube 18 can be turned on only when necessary, so that the amount of power stored in the battery 32 can be saved.

In the present embodiment, an argon tube is used as the light source 18 as the cathode tube 18. However, a neon tube, a fluorescent lamp, or the like may be used. Or, if the number of light sources 18 is 2
It may be more than books.

Further, technical ideas other than the claimed invention which can be grasped from the embodiment will be described below together with their effects. -The light source according to any one of claims 1 to 7, wherein the light source is a cathode ray tube.
The display device according to item. With this configuration, power consumption can be reduced as compared with the case where a fluorescent lamp is used. In addition, since the durability against intermittent lighting is higher than that of the fluorescent lamp, the life of the fluorescent lamp can be made longer than when the fluorescent lamp is used.

A battery connected to the solar cell, and a voltage detecting circuit as a detecting means for detecting an applied voltage of the solar cell to the battery, wherein the applied voltage becomes equal to or less than a predetermined value and the state continues for a predetermined time; The display device according to claim 6, wherein lighting of the light source is started at a time. With this configuration, the sunset can be accurately determined, and the light source can be turned on at a desired time.

The display device according to claim 6, wherein the lighting of the light source is started when it is determined by the optical sensor as the detecting means that the irradiation amount of sunlight has been exhausted. In the case of such a configuration, when sunset, the amount of irradiation of sunlight disappears, and the light sensor detects this and turns on the light source. Therefore, when the place where the display device is installed becomes dark, the display unit can be brightly illuminated.

Control means for controlling lighting of the light source;
The display device according to any one of claims 1 to 7, further comprising a human detection sensor for detecting the presence or absence of a human, wherein the control unit controls turning on and off of the light source based on a signal from the human detection sensor. With this configuration, when a person approaches the display device, the person detection sensor detects the person, and the control unit turns on the light source based on the signal, and when the person disappears, the person detection sensor detects it. The control means turns off the light source based on the detected signal. Therefore, since the light source can be turned on only when necessary, power consumption can be saved.

[0065]

As described above in detail, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, it is possible to make the display unit bright at all times and easily recognize the display unit.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), since the light source is intermittently turned on as compared with the case where the light source is continuously turned on, the power consumption is reduced. Therefore, power required for using the display device can be saved.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effect of the invention described in claim 2, when the light source is turned off, the outer surface side of the light storage section can be brightly illuminated without using a power supply, and power can be saved.

According to the invention set forth in claim 4, according to claim 1,
In addition to the effects of the invention described in any one of Items 3 to 3, the light source can be turned on and off at a desired time. According to the invention described in claim 5, any one of claims 1 to 4
In addition to the effects of the invention described in the paragraph, when a solar cell is used, a commercial power supply is not required, so that the maintenance cost of the display device is reduced. Further, when the solar battery and the commercial power supply are used together, when the solar battery becomes unusable, the light source is turned on by the commercial power supply and the outer surface side of the light storage section can be brightly illuminated.

According to the invention of claim 6, according to claim 1,
In addition to the effects of the invention described in any one of the above-described embodiments, it is possible to accurately determine the sunset and to turn on the light source at a desired time.

According to the invention of claim 7, according to claim 4,
In addition to the effects of the invention described in (1), power can be saved as compared with the case where the light source is kept on. In addition, since the light energy of the light source is efficiently stored in the light storage unit as other energy, the display unit can always be illuminated brightly for a long time.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view showing a bus sign according to an embodiment;

FIG. 2 is an exemplary front view showing a bus sign according to the embodiment;

FIG. 3 is a partial sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is an exemplary diagram showing an electrical configuration of a bus sign according to the embodiment;

FIG. 5 is a time chart showing a time pattern of turning on and off a cathode ray tube.

[Explanation of symbols]

11 ... bus sign as display device, 13 ... display unit, 18
.., A cathode ray tube as a light source, 22 a light storage section, 24 a light storage plate constituting a light storage section, 29 a solar cell as a power supply, 31.
A control device as control means; 35 a voltage detection circuit as detection means; 38 a commercial power supply as power supply.

Claims (7)

[Claims] 1. A light storage unit (22) provided on a display unit (13) for storing light energy as another energy by irradiating light and emitting light by the stored energy. A display device, comprising: a light source (18) for illuminating the light source; and power supplies (29, 38) for lighting the light source (18), wherein the outer surface side of the light storage section (22) is a display surface. 2. The display device according to claim 1, further comprising control means (31) for controlling intermittent lighting of the light source (18). 3. The light storage section (22) stores the light energy as another energy when the light source (18) is turned on and when an external light source is irradiated, and emits light by the stored energy when the light source (18) is turned off. The display device according to claim 1 or 2, wherein 4. A control means (31) for controlling intermittent lighting of the light source (18), and a storage means for storing a time pattern in which a lighting time and a lighting time are set in advance, wherein the control means (31) Light source (1
The display device according to any one of claims 1 to 3, wherein lighting and extinguishing of (8) are controlled. 5. The power supply (29, 38) includes a solar cell (2).
The display device according to any one of claims 1 to 4, wherein at least one of (9) and a commercial power supply (38) is used. 6. The lighting device according to claim 1, further comprising a detecting unit configured to detect the presence or absence of sunlight, wherein lighting of the light source is started based on a detection result of the detecting unit. Display device. 7. The display device according to claim 4, wherein the time pattern repeatedly turns on and off the light source.