JP2012255847A - Display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display system capable of stably providing useful information even when power failure occurs due to disaster.SOLUTION: A display system includes: a solar cell; a power storage device in which electric power obtained by the solar cell is stored; and a display device which receives the electric power from the solar cell, the power storage device and a commercial power supply. The display device includes a control part which performs an intermittent operation of the display device when power supply from the commercial power supply is stopped.

Description

  The present invention relates to a display system.

  Various devices and systems that respond to disasters such as earthquakes and tsunamis have been proposed. For example, Patent Document 1 discloses a warning means, a digital television receiver that transmits a control signal indicating a warning state to the warning means in synchronization with the detected emergency warning broadcast activation flag signal, and a video from the digital television receiver. An emergency alert receiving system including a television receiver for viewing an audio signal as required is disclosed.

  Patent Document 2 includes a solar cell and a power storage unit that stores electric power generated by the solar cell. When an emergency warning signal is received, a radio broadcast from a broadcasting station such as NHK (Japan Broadcasting Corporation) is received. Thus, an outdoor guidance display device is disclosed in which broadcast sound is generated from a speaker and characters indicating an emergency warning are displayed on a character display.

  Patent Document 3 also includes a storage battery as a power source for emergency alert broadcast receivers in the event of a disaster. On a daily basis, power from a commercial power source is stored in the storage battery, and the amount of power stored in the storage battery is stopped during a disaster. A wireless emergency alert broadcast dedicated receiver is disclosed in which the amount of stored power can be broadcast until the subsequent power transmission is resumed.

Japanese Patent Laying-Open No. 2006-270138 (5th page, FIG. 1 etc.) Japanese Unexamined Patent Publication No. 2004-318684 (page 7, FIG. 3, etc.) JP-A-8-228160 (summary etc.)

  However, when a power failure occurs in which the supply from the commercial power supply is stopped due to a disaster, in Patent Document 1, the power supply to the warning means, the digital television receiver, and the television receiver is stopped, and each device operates. It becomes impossible. Therefore, the warning by the warning means and the emergency warning broadcast by the television receiver cannot be viewed.

  In addition, when a power outage occurs due to a disaster, in Patent Document 2, the operation can be continued by the power storage unit, but if the power stored in the power storage unit is used up, radio broadcasting and text display may be stopped. .

  In addition, when a power failure occurs due to a disaster, in Patent Document 3, the operation can be continued with the storage battery. However, when a power outage for a long time exceeding the assumption occurs, the power of the storage battery is used up and broadcast reception is not possible. It becomes possible.

  In view of the above problems, an object of the present invention is to provide a display system that can stably provide useful information even when a power failure occurs due to a disaster.

A display system according to an aspect of the present invention includes a solar cell,
A power storage device for storing electric power obtained by the solar cell;
A display device to which electric power is supplied from the solar cell, the power storage device and a commercial power source,
The display device includes a control unit that intermittently operates the display device when power supply from a commercial power supply is stopped.

  According to such a display system, even when a power failure occurs due to a disaster, the display device is operated intermittently, so that the power of the power storage device is suppressed from being exhausted, and the display device is continuously operated and useful. Stable information can be provided stably.

A display system according to another aspect of the present invention includes a solar cell,
A power storage device for storing electric power obtained by the solar cell;
A display device to which power is supplied from the solar cell, the power storage device and a commercial power source;
A detection device that detects the presence or absence of power supply from a commercial power supply,
When the power supply from the commercial power supply is stopped, the display device includes a control unit that controls to receive power from only the solar battery and the power storage device among the solar battery, the power storage device, and the commercial power supply. It is characterized by.

  According to such a display system, even when a power failure occurs due to a disaster, the display device receives power supply from only the solar battery and the power storage device, so that the display device can be stably operated and useful information can be stably supplied. Can be provided.

  Moreover, you may make it further provide the display control part which displays the information of public broadcasting on the display part of the said display apparatus when the power supply from a commercial power supply stops. Thereby, the information of public broadcasting can be provided stably.

Also, an outlet for supplying power to the outside,
You may make it provide the power supply part which starts supplying the power supply by the electric power from the said solar cell and the said electrical storage apparatus to the said outlet socket when the power supply from a commercial power supply is stopped. Thereby, even when a power failure occurs due to a disaster, emergency power can be supplied from the outlet.

In addition, an emergency alert broadcast detector that detects that an emergency alert broadcast has been implemented,
A display control unit that switches the display of the display device from a normal display to a public broadcast display when the emergency alert broadcast detection unit detects that the emergency alert broadcast is performed. Good. Thereby, when a disaster occurs and emergency warning broadcasting is carried out, the display is automatically switched to the display of public broadcasting, so that it is possible to warn the surroundings.

  In addition, a speaker and a volume control unit that raises the volume of the output of the speaker from a normal time when the emergency warning broadcast detection unit detects that the emergency warning broadcast is performed are provided. Also good. Thereby, when a disaster occurs, it is possible to warn the surroundings by increasing the volume compared to the normal time.

  According to the display system of the present invention, it is possible to stably provide useful information even when a power failure occurs due to a disaster.

1 is a perspective view of a display system according to an embodiment of the present invention. It is an AA schematic sectional drawing of the display system shown in FIG. 1 is a block diagram of a display system according to an embodiment of the present invention. It is a figure which shows an example of the operation schedule at the time of normal. It is a figure which shows an example of the operation schedule at the time of a power failure. It is a figure which shows an example of the public broadcast display at the time of a power failure. It is a perspective view which shows one Embodiment of a solar cell unit. It is a schematic sectional drawing of the solar cell unit shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic structure of a display system 100 according to an embodiment of the present invention. FIG. 1 is a perspective view of the display system 100 as viewed from the image display side (hereinafter referred to as the front side). In FIG. 1, the vertical direction in the figure is the vertical direction. Further, in FIG. 1, for clarity of illustration, the surface on which the image of the display unit is displayed is hatched. A display system 100 according to an embodiment of the present invention is mainly installed in an outdoor public facility or a park.

  FIG. 2 is a schematic cross-sectional view taken along the line AA of the display system 100 shown in FIG. FIG. 2 shows a state where a user on a wheelchair uses it.

  As shown in FIG. 1, the display system 100 supports the main body 30 by being connected to a rectangular parallelepiped main body 30 and two side surfaces (left side and right side) substantially perpendicular to the front of the main body 30. Two rectangular parallelepiped support portions 40L, 40R, legs 42L, 43L, 42R, 43R that are provided on the vertically lower surfaces of the support portions 40L, 40R and support the display system 100, and are connected to the upper portion of the main body 30 The solar cell unit 45 connected with the main-body part 30 via the part 51 (FIG. 2) is provided. The leg portions 42L, 43L, 42R, and 43R may not be provided, and the support portions 40L and 40R may be directly installed on the ground.

  The main body unit 30 visually recognizes the display unit 8 that displays an image inside, the touch panel 9 disposed on the front side of the display unit 8, and the image that is provided on the front side of the main body unit 30 and displayed on the display unit 8 from the outside. The enabling window 30W, the detection unit 10 for detecting an object existing on the front side of the display system 100, the communication unit 11 communicating with a portable terminal owned by the user of the display system 100, and a speaker for outputting sound 13. In addition, the main body 30 may include a cooling device (for example, a fan that blows air) that cools the inside.

  In the present embodiment, the display unit 8 is a liquid crystal display unit. The touch panel 9 is a touch sensor that is provided so as to face the outside from the window 30 </ b> W and detects a position touched by the user. A control unit (control unit 4 in FIG. 3 to be described later) provided inside the main body unit 30 (not shown in FIG. 1) is a position of the touch panel 9 touched by the user (a position in an image displayed on the display unit 8). An image corresponding to the above is displayed on the display unit 8. Further, the control unit may cause the speaker 13 to output sound when the user touches the touch panel 9.

  The detection unit 10 includes at least one sensor that can detect an object, such as a pyroelectric sensor or an image sensor, and detects a person present mainly on the front side of the display system 100. The control unit controls, for example, the display unit 8 and the speaker 13 depending on whether or not the detection unit 10 detects a person.

  Specifically, for example, when the detection unit 10 does not detect a person for a predetermined time, the control unit turns off the display of the display unit 8 (or lowers the luminance). Further, for example, when the detection unit 10 detects a person, the control unit turns on the display unit 8 (or increases the brightness), and controls the speaker 13 to output a voice message. Note that the detection unit 10 can detect human characteristics (for example, by processing an image acquired by imaging by an image sensor, the human gender and age can be detected), and the control unit can respond to the characteristics. The displayed image may be displayed on the display unit 8.

  The communication part 11 consists of RFID, for example, and can communicate with a user's portable terminal (for example, mobile phone). For example, the control unit controls the communication unit 11 so that predetermined data is transmitted and received between the communication unit 11 and the portable terminal when the user confirms that the communication is started by holding the portable terminal over the communication unit 11. To do.

  The user extends his / her hand toward the window 30 </ b> W or the communication unit 11 provided on the front side of the main body 30 and performs an operation. The same applies to users who are in wheelchairs. In addition, not only the window part 30W and the communication part 11, but the other structure which receives operation of users, such as a button, may be provided in the front side of the main-body part 30. FIG.

  The support portions 40L and 40R include weights 41L and 41R inside the vertically lower part. Note that the support portions 40L and 40R are not limited to the configuration including the weights 41L and 41R as long as the vertically lower portion is relatively heavy, and may have any configuration.

  The support portion 40L is connected to the left side surface of the main body portion 30, and the support portion 40R is connected to the right side surface of the main body portion 30. Further, the support portions 40L and 40R support the main body portion 30 such that a space surrounded by the lower portion of the main body portion 30, the right side of the support portion 40L, and the left side of the support portion 40R exists. Specifically, for example, the vertically upper portions of the support portions 40L and 40R are connected to the left side surface and the right side surface of the main body portion 30, respectively.

  The space provided vertically below the main body 30 allows at least a part of the wheelchair to enter (details will be described later). In other words, a member that blocks the space is not provided vertically below the front side and the back side of the main body 30. Specifically, for example, what constitutes a part of the display system 100 is not installed vertically below the front side and the back side of the main body 30, and both the front side and the back side are open.

  Further, legs 42L and 42R are respectively connected to the front side of the display system 100 on the vertically lower surfaces of the support portions 40L and 40R. Similarly, legs 43L and 43R are connected to the back side of the display system 100 on the vertically lower surfaces of the support portions 40L and 40R, respectively.

  As shown in FIG. 2, a user P who has been in a wheelchair can place his / her feet (for example, from the toes to the vicinity of the knees, or even the thighs) or a part of the wheelchair in the space below the main body 30 (see FIG. 2). For example, a portion on which a foot is placed can be invaded. Then, the upper body of the user P riding on the wheelchair approaches the front of the main body 30. As a result, the user P in the wheelchair can reach the window 30W (touch panel 9) and the communication unit 11 with his / her face and body facing the front of the main body 30, and the display system 100 can be used. Operation becomes possible. Thus, by providing a space below the main body 30, the user P on the wheelchair can easily operate the display system 100.

  In particular, the user P riding in a wheelchair can operate the display system 100 simply by checking the display system 100 and then moving straight toward the display system 100 as it is. Therefore, for example, it becomes possible to eliminate the need for the user P riding in a wheelchair to change the direction of the wheelchair by 90 degrees and to operate while turning his face sideways.

  Further, the support portions 40L and 40R are relatively heavy vertically downward. Therefore, it is possible to return the center of gravity of the display system 100 moving vertically upward by providing a space vertically below the main body 30 to the vertically downward direction. Therefore, it is possible to prevent the display system 100 from falling over.

  The solar cell unit 45 includes solar cells 21A, 21B, 21C and 21D, a first antenna A1 and a second antenna A2, and an installation base 50. The installation base 50 is a base on which the solar cells 21A, 21B, 21C and 21D, the first antenna A1, and the second antenna A2 are installed on the upper surface. The solar cells 21 </ b> A to 21 </ b> D receive sunlight and generate drive power for the display system 100. The first antenna A1 is an antenna that receives broadcast waves of content (region information content, advertisement information content, etc.) that is normally displayed, and the second antenna A2 is an antenna that receives digital terrestrial broadcast waves.

  The installation base 50 has a trapezoidal bottom surface portion 50A (FIG. 2) with the lower base on the front side of the display system 100 and the upper base on the back side, and the back surface of the display system 100 with the upper base on the bottom surface portion 50A as the upper base. A trapezoidal back surface portion 50B inclined to the side (FIG. 2), an oblique side connecting the upper and lower bases of the bottom surface portion 50A, an oblique side connecting the upper and lower bases of the rear surface portion 50B, and these two oblique sides. A triangular left and right side surface surrounded by sides, and an installation portion 50C (FIGS. 1 and 2) formed so as to close an opening formed from the bottom surface portion 50A, the back surface portion 50B, and the left and right side surface portions. The installation base 50 is hollow. This is because it is desirable that the installation base 50 be light to be provided above the main body 30.

  The solar cells 21A to 21D, the first antenna A1, and the second antenna A2 are installed in the recess provided in the installation unit 50C. 1st antenna A1 and 2nd antenna A2 are arrange | positioned in the center part 50D of the recessed part of the installation part 50C. The solar cells 21A to 21D are arranged so as to surround the first antenna A1 and the second antenna A2. Each of the solar cells 21A to 21D has a rectangular shape, and is arranged such that one short side of each of the solar cells 21A to 21D faces a part of the long side of the adjacent solar cell. With such an arrangement, the solar cells 21A to 21D can efficiently receive sunlight and generate electric power, and the first antenna A1 and the second antenna A2 can efficiently receive radio waves.

  Moreover, since the four solar cells 21A to 21D are arranged so as to surround the first antenna A1 and the second antenna A2, the solar power generation unit has a substantially square projection shape, and the maximum installation dimension can be minimized. Thereby, there is an advantage in adopting a configuration in which the arrangement direction of the solar cell unit 45 can be freely changed with respect to the display screen direction in order to maximize the efficiency of solar power generation. Specifically, no matter how the arrangement direction of the solar cell unit 45 is changed, the amount of projection of the solar cell unit 45 forward from the display screen can be suppressed, and the center of gravity position of the solar cell unit 45 changes substantially. Therefore, the fall of the display system 100 can be suppressed.

  In addition, about a solar cell unit, you may employ | adopt the solar cell unit 145 shown in FIG.6 and FIG.7. In the solar cell unit 145, an opening is provided in the center of the upper surface of the installation table 150, and a square cover member 151 is attached to the upper surface of the installation table 150 so as to close the opening. The first antenna A <b> 1 and the second antenna A <b> 2 are disposed below the cover member 151 and attached to a base member 152 positioned below the cover member 151. Here, the cover member 151 is made of a radio wave transmitting material. The antenna has an individual installation direction and angle of attack depending on the system. Therefore, by making it possible to freely install a commercially available antenna below the cover member 151, there is an advantage that the appearance is arranged together with the protection of the antenna, the scenery is improved, and the cleaning becomes easy. In addition, since the antenna is arranged below the square cover member 151, the antenna is arranged even when the arrangement orientation of the solar cell unit 145 can be freely changed with respect to the display screen direction. There is an advantage that the arrangement of is easy.

  In FIG. 7, the surface on which the first antenna A1 and the second antenna A2 are installed is parallel to the bottom surface of the installation table 150. However, this is an example, and the antenna installation surface has good reception. Changes can be made as appropriate so that they can be performed. In addition to the antenna for digital terrestrial broadcasting, for example, a BS / CS satellite broadcast receiving antenna may be used as the antenna.

  Next, a block diagram of the display system 100 according to an embodiment of the present invention is shown in FIG. As shown in FIG. 3, the display system 100 includes a display device 20, solar cells 21 </ b> A to 21 </ b> D, a controller 22, a storage battery 23, and an outlet 60. The display device 20 includes a first antenna A1, a second antenna A2, a first reception unit 1, a second reception unit 2, a storage unit 3, a control unit 4, a display control unit 5, a backlight 6, and A display unit 8 including a display panel 7, a touch panel 9, a detection unit 10, a communication unit 11, a power supply unit 12, a speaker 13, a decoder 14, an amplifier 15, and an OSD (On Screen Display) unit 16. And.

  The solar cells 21A to 21D generate power by photoelectrically converting received sunlight. The controller 22 supplies the power generated by the solar cells 21 </ b> A to 21 </ b> D to the display device 20 and the storage battery 23. The storage battery 23 is, for example, a lithium ion battery (battery pack). Lithium ion batteries can be downsized and have high voltages.

  In principle, the controller 22 supplies most of the power generated by the solar cells 21 </ b> A to 21 </ b> D to the display device 20 as it is. Then, surplus power (difference power between the power generated by the solar cells 21 </ b> A to 21 </ b> D and the power consumption of the display device 20) is supplied to the storage battery 23. In addition, when the amount of solar radiation is small, such as at night or in rainy weather, the controller 22 controls the power supply from the storage battery 23 to the display device 20. That is, the electric power stored in the storage battery 23 is supplied to the display device 20 via the controller 22.

  The first antenna A1 is an antenna that receives a signal transmitted from an external content server (eg, ASP server, personal computer, etc.) or a broadcasting station by wireless communication (eg, WiMAX, IEEE 802.11b / g, etc.). . The first receiving unit 1 includes a signal processing unit that performs demodulation processing and the like on a signal received by the first antenna A1. For example, if the wireless signal is an MPEG2-TS format signal modulated and transmitted by the OFDM method, the first receiver 1 performs OFDM demodulation and extracts the MPEG2-TS signal. The extracted MPEG2-TS signal is output to the storage unit 3. The content stored in the storage unit 3 by the output of the first receiving unit 1 is content (region information content, advertisement information content, etc.) to be displayed on the display panel 7 at normal times.

  The second antenna A2 is an antenna that receives terrestrial digital broadcast waves from a broadcast station that broadcasts terrestrial digital broadcasts. The second receiving unit 2 includes a signal processing unit that performs demodulation processing and the like on the signal received by the second antenna A2. The video / audio data extracted by the second receiving unit 2 is output to the storage unit 3. The second receiving unit 2 extracts a TMCC (Transmission Multiplexing Configuration Control) signal from the signal received by the second antenna A2 in demodulation processing. The TMCC signal includes an activation control bit, which can be monitored to monitor the implementation of emergency warning broadcasting (EWS).

  The storage unit 3 stores the content extracted by the first receiving unit 1 and the second receiving unit 2. When the content is real-time content (when the received content is immediately displayed on the display panel 7), the storage unit 3 functions as a buffer memory (the content output by the second receiving unit 2 corresponds to real-time content) ). When the content is content that is displayed in response to a user operation or content that is displayed based on a preset time schedule, the storage unit 3 functions as a storage medium (content output by the first receiving unit 1) Corresponds to these contents).

  The decoder 14 decodes the content stored in the storage unit 3, outputs video data to the display control unit 5, and outputs audio data to the amplifier 15. The OSD unit 16 generates an OSD image and superimposes the generated OSD image on the video output of the decoder 14.

  The display control unit 5 performs display control on the display panel 7. Specifically, the liquid crystal corresponding to each pixel of the display panel 7 is modulated according to the input video data. Since the display control unit 5 requires high-speed processing, the display control unit 5 is realized by a dedicated hardware circuit provided separately from the control unit 4.

  The display panel 7 is a part that actually displays an image, and a liquid crystal display panel is used in the present embodiment. In the liquid crystal display panel, the liquid crystal corresponding to each pixel of the panel is driven on / off (or an intermediate state thereof) according to the content of the image to be displayed.

  The backlight 6 irradiates the display panel 7 with white light. As the backlight 6, for example, a cold cathode fluorescent lamp (CCFL) or an LED light source is used. It is desirable to use an LED light source to reduce power consumption.

  The amplifier 15 performs D / A conversion and amplification on the audio data input from the decoder 14 and outputs the result to the speaker 13. As a result, the audio of the content is output from the speaker 13.

  The power supply unit 12 DC / DC converts the DC power supplied from the solar cells 21 </ b> A to 21 </ b> D and the storage battery 23 via the controller 22, and the DC power obtained by the conversion includes the backlight 6 and the display panel 7. It supplies to each part of the display apparatus 20 to perform. The power supply unit 12 performs AC / DC conversion on AC power (for example, AC 100V) supplied from a commercial power source, and converts the DC power obtained by the conversion of the backlight 6 and the display panel 7 into the display device 20. Supply to each part.

  The power supply unit 12 can also DC / AC convert the DC power supplied from the controller 22 and supply AC power obtained by the conversion to the outlet 60. Thereby, emergency power can be supplied to the external electric equipment connected to the outlet 60. The outlet 60 is preferably provided on the back side of the main body 30 (FIG. 1), for example.

  Next, various operations of the display system 100 corresponding to the occurrence of a disaster will be described.

<Independent power mode operation at power failure>
In normal time, as shown in FIG. 4A, for example, the display device 20 is continuously operated for 14 hours from 7:00 to 21:00. In this case, when the control unit 4 detects that the current time is 7 o'clock by a timer (not shown), the display unit 20 displays the DC power supplied from the controller 22 and the AC power supplied from the commercial power supply. The power supply unit 12 is controlled so as to start supply to each unit. Then, when detecting that the current time is 21:00, the control unit 4 controls the power supply unit 12 so as to stop the DC power supply to each unit of the display device 20.

  When a power failure occurs in which AC power supply from the commercial power supply is stopped, the display device 20 shifts to an independent power supply mode that operates only with power from the solar cells 21A to 21D and the storage battery 23. Specifically, when the control unit 4 detects that the AC power supply from the commercial power supply is stopped based on a signal from the power supply unit 12, the control unit 4 starts from 22 o'clock, for example, as shown in FIG. 4B. Control for intermittent operation of the display device 20 is started every half hour until half hour. In this control, when the control unit 4 detects that every hour from 7 o'clock to 22:30 is reached, the power source is configured to start supplying DC power from the DC power supplied from the controller 22 to each unit of the display device 20. The supply unit 12 is controlled. Then, when detecting that 30 minutes have elapsed since the start of power supply, the control unit 4 controls the power supply unit 12 to stop the DC power supply to each unit of the display device 20.

  In addition, when the display device 20 starts intermittent operation (that is, when power supply to each unit of the display device 20 is started), the control unit 4 selects a channel for public broadcasting (for example, NHK). 2 The command is given to the receiving unit 2, and the public broadcast video is displayed on the display panel 7 during intermittent operation. At this time, the OSD unit 16 generates a specific OSD image and provides information from the operation schedule and the public broadcast that the display panel 7 operates in the independent power supply mode / intermittent operation by superimposing the video on the public broadcast. A message to the effect may be displayed (for example, display 70 in FIG. 5).

  In addition to displaying public terrestrial broadcasting as described above, guidance to an evacuation site by satellite broadcasting may be displayed, for example. Thus, the display of information transmitted by broadcasting corresponds to the display of information on public broadcasting.

  According to such an operation, even when a power failure occurs due to a disaster such as an earthquake, the display device 20 is intermittently operated, so that the power of the storage battery 23 is prevented from being exhausted, and information on public broadcasting is continuously maintained. Can be provided. In addition, by providing information on public broadcasts to victims who are disconnected from information due to power outages, panic can be suppressed and orderly behavior can be promoted. That is, secondary disasters due to lack of information can be suppressed.

  Note that the operation schedules shown in FIGS. 4A and 4B are merely examples, and can be changed according to specifications and the like.

  In addition, in the above, after the occurrence of a power failure, the mode is switched to the independent power mode, and after the start of the intermittent operation, the public broadcast is selected. You may tune in for public broadcasting without starting. In addition, it is possible to select a public broadcast immediately after the occurrence of a power failure and then shift to the independent power supply mode. It should be noted that immediately after the occurrence of a disaster, it is considered that a broadcast program related to the disaster is usually broadcast in public broadcasting (for example, NHK). Therefore, disaster information is displayed on the display unit 8 when a public broadcast is selected after the occurrence of a power failure.

<Emergency power supply during power outage>
When the control unit 4 detects that the AC power supply from the commercial power supply has been stopped based on the signal from the power supply unit 12, the control unit 4 starts to supply the AC power from the controller 22 with the DC power to the outlet 60. 12 is controlled.

  As a result, even when a power failure occurs due to a disaster, if an external electrical device is connected to the outlet 60, it is possible to supply emergency power to the electrical device.

<Warning action at emergency alarm>
At normal time, the control unit 4 monitors the activation control bit included in the TMCC signal extracted by the second reception unit 2. When the control unit 4 detects that the activation control bit indicates the implementation of the emergency alert broadcast (EWS), the control unit 4 causes the second reception unit 2 to select a channel for public broadcasting (for example, NHK). The display panel 7 is switched from normal content display to public broadcast display. At this time, the control unit 4 controls the amplifier 15 to increase the volume of the output of the speaker 13 more than usual. Thereby, the sound of public broadcasting is output from the speaker 13 at a louder volume than usual. In addition, you may make it output an alarm sound with the volume increased in this way.

  As a result, when a disaster such as an earthquake or tsunami occurs, the display is automatically switched to the public broadcast, and the sound of the public broadcast is output at a louder volume than usual, so that the surroundings can be warned. When a certain period of time has elapsed since the execution of the emergency alert broadcast is detected, the control unit 4 returns the display to the normal content display, and controls the amplifier 15 to set the output of the speaker 13 to the normal volume. return.

  Although the embodiments of the present invention have been described above, the embodiments can be variously modified within the scope of the gist of the present invention.

  For example, the display device according to the present invention is not limited to a liquid crystal display device, and a self-luminous display device such as a plasma display or an organic EL display may be applied.

DESCRIPTION OF SYMBOLS 1 1st receiving part 2 2nd receiving part 3 Accumulation part 4 Control part 5 Display control part 6 Backlight 7 Display panel 8 Display part 9 Touch panel 10 Detection part 11 Communication part 12 Power supply part 13 Speaker 14 Decoder 15 Amplifier 16 OSD part DESCRIPTION OF SYMBOLS 20 Display apparatus 21A-21D Solar cell 22 Controller 23 Storage battery 30 Main part 45, 145 Solar cell unit 50, 150 Installation stand 60 Outlet 100 Display system 151 Cover member 152 Base member A1 1st antenna A2 2nd antenna

Claims (6)

Solar cells,
A power storage device for storing electric power obtained by the solar cell;
A display device to which electric power is supplied from the solar cell, the power storage device and a commercial power source,
The display system includes a control unit that intermittently operates the display device when power supply from a commercial power supply is stopped. Solar cells,
A power storage device for storing electric power obtained by the solar cell;
A display device to which power is supplied from the solar cell, the power storage device and a commercial power source;
A detection device that detects the presence or absence of power supply from a commercial power supply,
When the power supply from the commercial power supply is stopped, the display device includes a control unit that controls to receive power from only the solar battery and the power storage device among the solar battery, the power storage device, and the commercial power supply. A display system characterized by   The display system according to claim 1, further comprising a display control unit configured to display public broadcast information on the display unit of the display device when power supply from a commercial power source is stopped. An outlet for supplying power to the outside;
The power supply part which starts supplying the power supply by the electric power from the said solar cell and the said electrical storage apparatus to the said electrical outlet at the time of the stop of the power supply from a commercial power supply, The any one of the Claims 1-3 Display system as described in. An emergency alert broadcast detector that detects that an emergency alert broadcast has been implemented;
A display control unit that switches the display of the display device from a normal display to a public broadcast display when the emergency alert broadcast detection unit detects that the emergency alert broadcast has been carried out. The display system according to any one of claims 1 to 4. Speakers,
6. A volume control unit that, when the emergency alert broadcast detection unit detects that the emergency alert broadcast is performed, includes a volume control unit that increases the volume of the output of the speaker from a normal level. Display system as described in.