JP5372690B2 - Information display apparatus display control method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display control method for an information display device and the device, allowing previous recognition that traffic information is displayed from beyond a legible distance, and allowing reduction in power consumption. <P>SOLUTION: In this display control method for the information display device, lighting is performed in a first lighting state for making display read, when it is decided that a vehicle is positioned in a position wherein the traffic information is legible, and lighting is performed in a second lighting state for arousing attention to that the traffic information is displayed, when it is decided that the vehicle is not positioned in the position wherein the traffic information is legible. In the first lighting state, a display part displayed with the traffic information and an attention light arousing the attention are respectively lighted in a first display luminance and in a first lighting luminance corresponding to an illuminance of the circumference. In the second lighting state, the display section is lit in a second display luminance which is lower than the first display luminance, and the attention light is lit in a second lighting luminance which is higher than the first lighting luminance, or the first lighting luminance. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a display control method and apparatus for an information display device that is installed on a general road, an expressway, etc., and displays traffic information such as “lane control during this construction ahead” to the driver, and more specifically, the traffic information. The present invention relates to a display control method for an information display device and its device, which can make it possible to recognize in advance that the display is being performed from a distance beyond the legible distance and reduce power consumption.

  As a display method of an information display device installed on a road with little traffic of a vehicle such as a mountainous area, a proposal to display a display item only when a vehicle is detected has been proposed (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-096214

As in Patent Document 1, when a vehicle approaching the information display device is detected and the display item is suddenly changed from a light-off state where the display item is not displayed on the information display device, Since the driver could not cope with the change, there was a problem that the interpretation time for reading the display item was shortened and information could not be transmitted sufficiently.
The present invention has been made in view of the above problems, and interprets that traffic information is being displayed by controlling lighting of a display unit and a warning light according to the position of a vehicle approaching the information display device. It is an object of the present invention to provide a display control method for an information display device and its device that can be recognized in advance from a possible distance and that can reduce power consumption.

The present invention is as follows.
1. A display unit that displays traffic information toward a vehicle approaching from a predetermined direction; a caution light that is provided near the display unit and is lit to alert that the traffic information is displayed; and the display An information display device comprising: an illuminance detector that detects ambient illuminance of the unit; a vehicle detector that detects the vehicle; and a control unit that switches a lighting state of the display unit and the caution light according to a position of the vehicle. Display control method,
When the vehicle detector detects the vehicle at a first point, switching the lighting state to a first lighting state that is a lighting state for reading the traffic information;
Switching the lighting state to a second lighting state that is a lighting state for calling attention to the traffic information being displayed when it is determined that the vehicle has reached the second point. ,
Between the first point and the second point includes a legible range in which the traffic information can be read from the vehicle,
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. A display control method for an information display device, wherein the display control method is a lighting state in which lighting is performed with luminance or lighting is performed with the first lighting luminance.
2. Above 1. The control unit determines that the vehicle has reached the second point when a predetermined time has elapsed since the vehicle was detected at the first point.
3. Above 1. Or 2. The vehicle detector is a millimeter wave radar provided in the vicinity of the display unit.
4). A display unit that displays traffic information toward a vehicle approaching from a predetermined direction; a caution light that is provided near the display unit and is lit to alert that the traffic information is displayed; and the display An information display device comprising: an illuminance detector that detects the ambient illuminance of the unit; a vehicle detector that detects the vehicle; and a control unit that switches a lighting state of the display unit and the caution light according to a position of the vehicle. Display control method,
When the vehicle detector detects the vehicle at a first point, switching the lighting state to a second lighting state that is a lighting state for calling attention to the traffic information being displayed; and ,
When it is determined that the vehicle has reached a second point, the step of switching the lighting state to a first lighting state that is a lighting state for reading the traffic information;
When it is determined that the vehicle has reached a third point, the lighting state is switched to the extinguishing state,
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. A display control method for an information display device, wherein the display control method is a lighting state in which lighting is performed with luminance or lighting is performed with the first lighting luminance.
5. A display unit that displays traffic information toward a vehicle approaching from a predetermined direction; a caution light that is provided near the display unit and is lit to alert that the traffic information is displayed; and the display An information display device comprising: an illuminance detector that detects the ambient illuminance of the unit; a vehicle detector that detects the vehicle; and a control unit that switches a lighting state of the display unit and the caution light according to a position of the vehicle. Display control method,
When the vehicle detector detects the vehicle at a first point, switching the lighting state to a second lighting state that is a lighting state for calling attention to the traffic information being displayed; and ,
When it is determined that the vehicle has reached a second point, the step of switching the lighting state to a first lighting state that is a lighting state for reading the traffic information;
When it is determined that the vehicle has reached a third point, the lighting state is switched to the extinguishing state or the second lighting state according to the importance of the display item displayed on the display unit,
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. A display control method for an information display device, wherein the display control method is a lighting state in which lighting is performed with luminance or lighting is performed with the first lighting luminance.
6). 4. above. Or 5. The control unit determines that the vehicle has reached the second point when a first time has elapsed since the vehicle was detected at the first point, and the vehicle is at the first point. When the second time has elapsed since the detection, it is determined that the vehicle has reached the third point.
7). Above 6. The vehicle detector is a Doppler radar that is provided in the vicinity of the display unit and detects the speed of the vehicle.
The control unit sets the first time and the second time based on the speed of the vehicle detected at the first point.
8). A display unit for displaying traffic information toward a vehicle approaching from a predetermined direction;
A caution light that is lit to alert that the traffic information is displayed in the vicinity of the display unit;
An illuminance detector for detecting the ambient illuminance of the display unit;
A vehicle detector for detecting the vehicle;
A control unit that switches a lighting state of the display unit and the caution light according to the position of the vehicle,
The controller switches the lighting state to a first lighting state which is a lighting state for causing the traffic information to be read when the vehicle is detected at the first point by the vehicle detector. Switch to the second lighting state, which is a lighting state to call attention to the fact that the traffic information is displayed when it is determined that has reached the second point,
Between the first point and the second point includes a legible range in which the traffic information can be read from the vehicle,
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. An information display device characterized by being in a lighting state in which lighting is performed with luminance or lighting with the first lighting luminance.
9. Above 8. The control unit determines that the vehicle has reached the second point when a predetermined time has elapsed since the vehicle was detected at the first point.
10. Above 8. Or 9. The vehicle detector is a millimeter wave radar provided in the vicinity of the display unit.
11. A display unit for displaying traffic information toward a vehicle approaching from a predetermined direction;
A caution light that is lit to alert that the traffic information is displayed in the vicinity of the display unit;
An illuminance detector for detecting the ambient illuminance of the display unit;
A vehicle detector for detecting the vehicle;
A control unit that switches a lighting state of the display unit and the caution light according to the position of the vehicle,
The control unit is a second lighting state for calling attention to the fact that the traffic information is displayed when the vehicle is detected at the first point by the vehicle detector. Switch to the lighting state, and then switch to the first lighting state, which is a lighting state for reading the traffic information when it is determined that the vehicle has reached the second point, and the vehicle reaches the third point. When it is determined that the
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. An information display device characterized by being in a lighting state in which lighting is performed with luminance or lighting with the first lighting luminance.
12 A display unit for displaying traffic information toward a vehicle approaching from a predetermined direction;
A caution light that is lit to alert that the traffic information is displayed in the vicinity of the display unit;
An illuminance detector for detecting the ambient illuminance of the display unit;
A vehicle detector for detecting the vehicle;
A control unit that switches a lighting state of the display unit and the caution light according to the position of the vehicle,
The control unit is a second lighting state for calling attention to the fact that the traffic information is displayed when the vehicle is detected at the first point by the vehicle detector. Switch to the lighting state, and then switch to the first lighting state, which is a lighting state for reading the traffic information when it is determined that the vehicle has reached the second point, and the vehicle reaches the third point. Switching to the unlit state or the second lit state according to the importance of the display item displayed on the display unit when it is determined that
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. An information display device characterized by being in a lighting state in which lighting is performed with luminance or lighting with the first lighting luminance.
13. Above 11. Or 12. The control unit determines that the vehicle has reached the second point when a first time has elapsed since the vehicle was detected at the first point, and the vehicle is at the first point. When the second time has elapsed since the detection, it is determined that the vehicle has reached the third point.
14 13. above. The vehicle detector is a Doppler radar that is provided in the vicinity of the display unit and detects the speed of the vehicle.
The control unit sets the first time and the second time based on the speed of the vehicle detected at the first point.

According to the display control method of the information display device of the present invention, attention is drawn to the fact that the first lighting state, which is the lighting state for reading the traffic information according to the position of the vehicle, and the traffic information are displayed. The lighting state is switched to two lighting states of the second lighting state. Thus, before the vehicle reaches a position where the traffic information can be read, the caution light is lit at the first lighting luminance that is the luminance according to the ambient illuminance or the second lighting luminance that is higher than that. Is done. As a result, even if the vehicle is in a distant position where the traffic information cannot be read, the warning light is turned on, so that the driver can recognize in advance that the information display device is displaying. it can. Further, until the vehicle reaches a position where the traffic information can be read, the display section is lit in the second lighting state in which the display brightness is turned on at the second display brightness lower than the normal brightness. This second lighting state is a lighting state that consumes less power than the first lighting state. In this way, since the normal lighting state and the lighting state with low power consumption are switched depending on whether or not the vehicle is detected, the power consumption can be greatly reduced as compared with the information display device that always lights regardless of the presence or absence of the vehicle. Can do.
Further, in the second lighting state, when the caution light is lit at the second lighting luminance that is higher than the luminance according to the surrounding illuminance, the information display device is present to the driver farther away. I can inform you.
Specifically, in the conventional display control method, the traffic information is displayed and the caution light is turned on at the same time. Therefore, the caution light is controlled by suppressing the luminance value to a luminance that does not interfere with the interpretation of the display item. . On the other hand, in the present display control method, the luminance of the caution lamp with low power consumption is increased at a position where the display item cannot be read, so that the presence of the information display device can be notified from a distance despite the low power consumption. For this reason, for example, when an important display item such as “XX traffic closed” is being displayed, there is a special effect in promptly informing the driver.
Further, when the control unit determines that the vehicle has reached the second point when a predetermined time has elapsed since the vehicle was detected at the first point, a simple configuration and reliability can be achieved. Excellent display control can be realized.
Further, when the vehicle detector is a millimeter wave radar provided in the vicinity of the display unit, the vehicle detector is not easily affected by differences in detection conditions such as weather, and the vehicle detection at the vehicle detection position can be accurately performed. . Moreover, compared with the case where the vehicle detector is arrange | positioned at the road side, a construction cost can be reduced significantly.

According to another display control method of the information display device of the present invention, the lighting state is switched to three lighting states of a first lighting state, a second lighting state, and a light-off state according to the position of the vehicle. Thereby, the information display device can be turned off until the vehicle is detected, so that the power consumption can be further reduced. In addition, the caution lamp is lit at the second lighting luminance that is higher than the first lighting luminance that is the luminance according to the surrounding illuminance until the traffic information can be read after the vehicle is detected. The As a result, the alerting power for the driver is high, and the driver of the vehicle can quickly recognize that the information display device is displaying.
According to still another display control method of the information display apparatus of the present invention, before the vehicle is detected, the display is switched to the second lighting state or the unlighting state according to the importance of the display item. For this reason, the risk of the driver overlooking important display items can be greatly reduced.
The controller determines that the vehicle has reached the second point when a first time has elapsed since the vehicle was detected at the first point, and the vehicle is at the first point. When it is determined that the vehicle has reached the third point when the second time has elapsed since the detection, display control with a simple configuration and excellent reliability can be realized.
Further, the vehicle detector is a Doppler radar provided in the vicinity of the display unit and detects the speed of the vehicle, and the control unit is based on the speed of the vehicle detected at the first point. When the first time and the second time are set, the lighting state can be switched at an optimal timing for each vehicle approaching the information display device. Moreover, compared with the case where the vehicle detector is arrange | positioned at the road side, a construction cost can be reduced significantly.

  On the other hand, the information display device of the present invention can realize an information display device suitable for exhibiting the effects of the display control methods described above.

It is a schematic installation figure from the side of the information display apparatus concerning this Embodiment 1. FIG. It is a front view which shows the information display apparatus concerning this Embodiment 1-3. It is a block diagram which shows the information display apparatus concerning this Embodiment 1-3. It is explanatory drawing which shows the example of a correlation with ambient illumination intensity and a brightness | luminance, (A) is the relationship in a 1st lighting state, (B) is the 2nd lighting when the lighting brightness of a caution lamp is 1st lighting brightness (C) shows the relationship in the second lighting state when the lighting luminance of the caution lamp is the second lighting luminance. It is a figure which shows the flowchart of the display control of the information display apparatus concerning this Embodiment 1. FIG. It is a schematic installation figure from the side of the information display apparatus concerning this Embodiment 2. FIG. It is a figure which shows the flowchart of display control of the information display apparatus concerning this Embodiment 2. FIG. It is a figure which shows the flowchart of the display control of the information display apparatus concerning this Embodiment 3. FIG. It is a front view which shows the information display apparatus concerning other embodiment.

Here, embodiments of the present invention will be described in the following order.
(1) Embodiment 1
(1-1) Configuration of information display device:
(1-2) Display control method of information display device:
(2) Embodiment 2
(2-1) Configuration of information display device:
(2-2) Display control method of information display device:
(3) Embodiment 3
(4) Other embodiments

(1) Embodiment 1
The information display device according to the first embodiment detects a vehicle approaching from a predetermined direction and displays traffic information on the vehicle. As shown in FIG. 1, the information display device 1 detects the vehicle V at a point 1 (L ₁ ) by the vehicle detector 30 and sets the display unit and the caution light to the first lighting state. When it is determined that the vehicle V has reached the point 2 (L ₂ ), the vehicle is switched to the second lighting state.
In the first lighting state, in order to make the driver of the vehicle V read the traffic information, the display unit is turned on with the first display luminance that is the luminance according to the illuminance around the information display device 1, and the caution light is information. This is a lighting state in which lighting is performed with the first lighting luminance that is luminance according to the illuminance around the display device 1. That is, the first lighting state is a lighting state in which the display unit and the caution light are respectively lit with luminance suitable for reading traffic information according to the ambient illuminance.

In the second lighting state, in order to alert the driver of the vehicle V that the traffic information is displayed, the display unit is set to the second display luminance that is lower than the first display luminance, and the caution light is information. Each of the lighting states is turned on as the first lighting luminance that is luminance according to the illuminance around the display device 1 or the second lighting luminance that is higher than that. That is, in the second lighting state, traffic information is being displayed from a distance with respect to the vehicle V because the caution light is lit even before the vehicle V is detected at the point 1 (L ₁ ). It is a lighting state that can be recognized. The second lighting state is a lighting state in which the display unit is lit at a low luminance (second display luminance), so that it is possible to recognize in advance that the display is being performed even if it cannot be read. It is.

Here, the second display luminance is not particularly limited as long as it is lower than the first display luminance. That is, it is sufficient that the luminance is such that it can be recognized that the image is displayed from beyond the readable range. Preferably, the luminance can be lower by about 40 (daytime) to 70 (nighttime)% than the first display luminance.
The second lighting luminance is not particularly limited as long as it is higher than the first lighting luminance. As a result, it is possible to recognize that the traffic information is being displayed from a distance farther than in the case where the lighting is performed with the first lighting luminance that is the normal luminance. The second lighting luminance can be preferably about 20 to 30% higher than the first lighting luminance.

  In a general information display device, when a caution lamp is turned on to alert a user, a plurality of caution lights are divided into two sets and alternately turned on and off at predetermined intervals. In the present embodiment, two caution lights 20 are provided as shown in FIG. Therefore, in both the present embodiment and the following embodiments, lighting the caution lamp means that the caution lamps 20 are alternately blinked at predetermined intervals. Of course, the number of caution lights is not limited to two, but may be three or more, and each group of one or more caution lights can be turned on and off alternately.

In Figure 1, the first point L ₁ and the second point L ₂ is a position at which the vehicle V is switched to the respective first lighting state and a second lighting state upon reaching. First, the vehicle V approaching is switched to the first lighting state when it is detected by the first point L ₁ by the vehicle detector 30. Then, when the vehicle V is determined to have reached the second location L _2, it is switched to a second lighting state. The timing for switching to the second lighting state may be after the time when the vehicle V reaches the second point even if the traveling speed of the vehicle V is low, and does not need to be precise. Thus, the determination, for example, assuming the traveling speed of the vehicle based on the road environment, it is possible that the vehicle V is a predetermined time T since the detection by the first point L ₁ is according to whether elapsed .

As shown in FIG. 1, the first point L ₁ and the second point L ₂ are set so as to include a legible range between them. This readable range is a range in which the display can be read from the vehicle V. Position of the starting end of the readable range in the vicinity information display device than the first location L ₁ as viewed from the position of the display unit 1 can be determined according to the character height and the vehicle speed and the like of a character to be displayed. For example, when traffic information is displayed using the current kanji, it is known that the height is 108 m under the condition of a character height of 45 cm and a vehicle speed of 60 km / h, which is the height of characters used in a general information display device. It has been. The position of the terminal end of the readable range in the distance than the information display device second point L ₂ in position viewed from the display unit 1, a limit field in the vertical direction of the vehicle driver is generally 7 ° Therefore, the position is in accordance with the height of the display unit of the information display device. For example, when the height of the display unit of the information display device is 6 m from the position of the vehicle driver's eyes, the end position is about 49 m.

Accordingly, the first point L ₁ and the second point L _2, as described above, may be appropriately set so as to include a different reading range according to the conditions. For example, when the displayed character height is 45 cm, the vehicle speed is 60 km / h, and the display height of the display unit is 6 m, the legible range is the range of 108 m to 49 m from the display unit. The point L ₁ and the second point L ₂ may be 130 m and 30 m, respectively.

(1-1) Configuration of information display device:
As shown in FIGS. 2 and 3, the information display device 1 includes a display unit 10, a caution light 20, a vehicle detector 30, an illuminance detector 40, and a control unit 50. The control unit 50 includes a receiving unit 51, a memory 52, and a CPU 53. In this configuration, the CPU 53 can execute the traffic information display program 52a recorded in the memory 52, control each unit based on the program, and perform predetermined arithmetic processing.

The receiving unit 51 receives a display control signal transmitted from a road management office or the like. The display control signal is a signal that indicates lighting or extinction, items of traffic information to be displayed, and the like. The information display device 1 displays traffic information when the lighting instruction is received by the display control signal, and does not display the traffic information when the lighting instruction is not received by the display control signal. Further, the information display device 1 can select traffic information to be displayed on the display unit by the display control signal.
The memory 52 is a storage medium capable of storing data, and includes a readable non-volatile memory (ROM) and a readable / writable memory (RAM). The above-described traffic information display program 52a, display information data 52b, luminance table data 52c, and the like are recorded in advance in the ROM. Further, the RAM can store data such as the number of times of vehicle detection by the vehicle detector 30. As the memory 52, a secondary storage device such as an HDD may be used in addition to a semiconductor memory.

The display information data 52b is data of display items related to various types of traffic information to be displayed, such as “the lane regulation during the previous construction”, “the caution about traveling with a falling object”, and “no heavy rain”. Which of these displays is selected can be selected by a display control signal.
The brightness table data 52c is data indicating the optimal brightness of the display unit 10 and the caution light 20 according to the illuminance around the information display device 1. The brightness table data 52c is, for example, in the correlation between the ambient illuminance and each brightness in the two lighting states of the first lighting state and the second lighting state as shown in FIGS. The illuminance range is divided into a plurality, and the optimum luminance corresponding to each is tabulated. Instead of the brightness table data 52c, based on the detected ambient illuminance value, the brightness obtained by calculation from a function representing the correlation between the ambient illuminance and the brightness as shown in FIGS. You may make it use.

  Although the light emitting element which comprises a caution light and a display part is not limited, In many cases, a light emitting diode (LED) is used. Usually, the light emission area of the caution light is smaller than the light emission area of the display unit, and therefore the number of LEDs constituting the caution light is smaller than the number of LEDs constituting the display unit. Therefore, the power consumption of the information display device during operation in the second lighting state can be reduced compared to the power consumption in the first lighting state even if the caution lamp is lit at the second lighting luminance. .

The CPU 53 includes a display control unit 53a, a caution light control unit 53b, a timer setting unit 53c, a luminance selection unit 53d, and the like. These may be built in the CPU 53 or may be provided around the CPU 53. Each unit may be configured by either hardware or software.
The luminance selection unit 53d selects the luminance of the display unit 10 and the caution lamp 20 by referring to the luminance table data 52c according to the ambient illuminance detected by the illuminance detector 40. The luminance selection unit 53d receives the lighting instruction by the display control signal, and refers to the second lighting state luminance table data 52c when the vehicle is not detected. When the vehicle detector 30 detects a vehicle, the brightness table data in the first lighting state is referred to. The illuminance detector 40 is not particularly limited as long as the illuminance around the information display device 1 is detected. For example, a photoresistor, a photodiode, or the like can be used.

The timer setting unit 53c sets a predetermined time T after the vehicle V is detected by the vehicle detector 30 as a timer. This time T, the vehicle V traveling at a predetermined speed is preset as the time to reach the second point L _2. That is, in the first embodiment, with the lapse of this time T, it is determined that the vehicle V has reached the second point L _2.
As long as the vehicle detector 30 detects the vehicle V, any detection means may be adopted. For example, in the first embodiment, a millimeter wave radar can be used as the vehicle detector 30. As shown in FIG. 3, the millimeter wave radar can be provided integrally with the display unit 10 of the information display device 1. With this millimeter wave radar, the vehicle V can be detected in front of the display unit 10 of the information display device 1 (the first point L ₁ ), and a vehicle detection signal can be output.

As described above, in the first embodiment, and the detection position of the vehicle V as the first point L _1. Accordingly, the time T is a time from when the vehicle V is detected at the first point L ₁ until it reaches the second point L ₂ . For example, assuming that the speed of the detected vehicle V is 60 km / h, the time until the vehicle V moves 100 m (L ₁ -L ₂ ) is 6 seconds, and this time is preset as time T. I can leave. Incidentally, so as to detect the vehicle V at the position of the first point L ₁ beyond, is measured by a separate timer the time until the vehicle V reaches the first point L ₁ from being detected, the vehicle V is when it is judged to have reached the first point L _1, it may be to switch to the second lighting state.

  The display control unit 53a causes the display unit 10 to display traffic information corresponding to a display control signal transmitted from a road management office or the like with reference to the display information data 52b. The display control unit 53a lights the display unit 10 with the luminance selected by the luminance selection unit 53d. As the display unit 10 according to the first embodiment, for example, an LED unit in which 16 × 16 light emitting elements are arranged in a matrix on the display surface can be employed.

  The caution light control unit 53b controls lighting of the caution light 20 based on the display control signal. When the lighting instruction by the display control signal is received, in the first embodiment, the caution light control unit 53b turns on the caution light 20 with the luminance selected by the luminance selection unit 53d. The caution light 20 uses an LED unit in which a large number of LEDs are arranged on the back surface of a circular lens as the caution light 20 and can be lit by red and yellow color lights. As an example of this lighting, in the case of important information with a high degree of danger, the two caution lights 20 blink alternately in red, and in the case of caution information with a medium degree of danger, the two caution lights 20 alternate in yellow Blinking.

(1-2) Display control method of information display device:
The display control of the information display apparatus according to the first embodiment is executed according to the flowchart shown in FIG.
First, the information display apparatus 1 monitors whether there is a lighting instruction by a display control signal transmitted from a road management office or the like and received by the receiving unit 51 (step S100). At this time, the information display device 1 is in the off state. If there is no lighting instruction, the light-off state is continuously maintained in step S105, and it is continuously monitored whether there is a lighting instruction. If there is a lighting instruction, the process proceeds to step S110.

In step S110, whether there is a vehicle detection signal, i.e., it monitors whether there is a vehicle V reaches the first point L _1. If it is determined in step S110 that there is no vehicle detection signal, in step S115, the respective luminances for turning on the display unit 10 and the caution lamp 20 in the second lighting state are selected. That is, the luminance selection unit 53d matches the ambient illuminance detected by the illuminance detector 40 with the luminance table data 52c, and selects the luminance according to the illuminance. The brightness table data 52c to be collated at this time is data used in the second lighting state of FIG. 4B when the lighting brightness of the caution lamp in the second lighting state is the first lighting brightness. When it is lighting luminance, it is data used for the 2nd lighting state of FIG.4 (C). In step S120, the display control unit 53a and the caution light control unit 53b turn on the display unit 10 and the caution light 20 with the brightness selected in step S115, and the process returns to step S100. Thus, if there is a lighting instruction is a second lighting state, whether there is a vehicle detection signal, i.e., monitors whether there is a vehicle V reaches the first point L _1. Thus, a vehicle V approaches toward the information display device 1, the second lighting state that the vehicle V before reaching the first point L _1, the information display device 1 is being displayed It is in a state of alerting.

In the state where the information display device 1 is in the second lighting state as described above, if it is determined in step S110 that there is a vehicle detection signal, the lighting state of the information display device 1 is changed to traffic in the subsequent processing. It switches to the 1st lighting state which is a lighting state for reading information. That is, in step S125, the time T is reset (reset), and time measurement is started. This time T, as described above, the time from the vehicle V is detected to reach the second point L ₂ is set in advance. And the brightness | luminance selection part 53d selects the brightness | luminance for lighting the display part 10 and the caution light 20 by the 1st display brightness | luminance which is a 1st lighting state, and lighting brightness (step S130). The brightness table data 52c to be collated at this time is data used for the first lighting state in FIG.

The display control unit 53a and the caution light control unit 53b turn on the display unit 10 and the caution light 20 with the selected luminances (step S135). In this way, in the first embodiment, switching from the second lighting state by the vehicle V is detected by the first point L ₁ to the first lighting condition. In addition, as shown in FIG. 5, when the vehicle detection signal is confirmed in the light-off state immediately after the lighting instruction is transmitted, the light-off state is changed to the first light-on state without passing through the second light-on state. Can be switched.

In step S140, whether the time T that the timer setting has elapsed in step S125, the i.e., monitors whether the vehicle V has reached the second point L _2. When T has elapsed, at step S145, whether there is a following vehicle detection signal, i.e., whether there is a subsequent other vehicle V has reached the first point L ₁ during the passage of time T Confirm. If there is no subsequent vehicle detection signal, the process returns to step S100 and the above-described processing is repeated. If there is a subsequent vehicle detection signal, the first lighting state is extended in the subsequent processing.

If there is a subsequent vehicle detection signal in step S145, the time difference T _{X =} Tt subsequent other vehicle V and time Tt 0 _{+ 1} detected during the first time Tt ₀ the vehicle V is detected that the time T has elapsed seeking ₀ + 1 -Tt _0, it performs the timer setting time _{T X} (step S150). That is, the time which is the first lighting state by this time T _X is extended. The course of this time T _X, it is determined whether the following vehicle V has reached the second point L _2. In step S155, whether the elapsed time T _X, namely the following vehicle V to monitor whether it has reached the second point L _2. When the time T _X has elapsed repeats the subsequent processing returns to step S145.

As described above, in the first embodiment, the lighting state is switched between the first lighting state and the second lighting state according to the position of the vehicle V. Thus, the caution light 20 is lit even before the vehicle V reaches a position where the traffic information can be read. As a result, even if the vehicle V is in a distant position where the traffic information cannot be read, the driver can be made to recognize in advance that the information display device 1 is displaying. Further, when the caution light 20 is lit with the second lighting luminance that is higher than the first lighting luminance that is the luminance according to the ambient illuminance, even if the vehicle V is at a farther position, The driver can be preliminarily recognized that the information display device 1 is displaying.
In the first embodiment, the display unit 10 is lit at the second display luminance that consumes less power than the display luminance in the first lighting state until the vehicle V is detected. As described above, since the normal lighting and the low power consumption lighting are switched depending on whether or not the vehicle V is detected, it is possible to reduce the power consumption as compared with the information display device that always performs the normal lighting.

  Furthermore, in the information display device 1 according to the first embodiment, the vehicle T is switched from the second lighting state to the first lighting state upon detection of the vehicle V, and the time T for lighting in the first lighting state is set in advance. Therefore, it is possible to realize display control excellent in reliability by a simple configuration.

(2) Embodiment 2
Next, an information display apparatus according to the second embodiment will be described. In the information display device according to the second embodiment, the same components as those of the information display device 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The information display device according to the second embodiment detects a vehicle approaching from a predetermined direction and displays traffic information on the vehicle, as in the information display device 1 according to the first embodiment. As illustrated in FIG. 6, the information display device 1 </ b> A detects the vehicle V at the point 1 (L ₁ ) by the vehicle detector 30 and sets the display unit and the caution light to the second lighting state. When it is determined that the vehicle V has reached the point 2 (L ₂ ), the vehicle V is switched to the first lighting state. Furthermore, when it is determined that the vehicle V has reached the point 3 (L ₃ ), the vehicle V is switched to the off state.

In FIG. 6, the first point L _1, the second point L _2, and the third point L ₃ are positions that are switched to the second lighting state, the first lighting state, and the light-off state, respectively, when the vehicle V arrives. is there. First, it is switched when the vehicle V approaching is detected at the first point L ₁ by the vehicle detector 30 to a second lighting state. Then, when the vehicle V is determined to have reached the second location L _2, it is switched to the first lighting state. Further, when the vehicle V is determined to have reached the third location L _3, it is switched to the OFF state. The determination may, for example, to measure the velocity of the vehicle V approaches, it can be time T ₁ and T ₂ determined on the basis of the speed according to whether elapsed respectively, also in the above-described first embodiment as illustrated, it can be depending on whether the vehicle V has elapsed predetermined time is detected at the first point L _1.

The second point L ₂ and the third point L ₃ is, as in Embodiment 1 may be appropriately set so as to include a readable range therebetween. Position of the first point L ₁ is and distance prompting caution, the detection range of the vehicle detectors employed may be appropriately set according to the environment or the like of the road information display device is installed. Therefore, for example, the first point L ₁ , the second point L _2, and the third point L ₃ can be 250 m, 130 m, and 30 m, respectively.

(2-1) Configuration of information display device:
The information display device 1A according to the second embodiment has substantially the same configuration as the information display device 1 according to the first embodiment. That is, the information display device 1A includes a display unit 10, a caution lamp 20, a vehicle detector 30, an illuminance detector 40, and a control unit 50, as shown in FIGS. The control unit 50 includes a receiving unit 51, a memory 52, and a CPU 53. In this configuration, the CPU 53 can execute the traffic information display program 52a recorded in the memory 52, control each unit based on the program, and perform predetermined arithmetic processing.

Timer setting unit 53c, vehicle V timer setting time T ₁ and T ₂ from being detected by the vehicle detector 30. These times T ₁ and T ₂ may be predetermined as in the above-described first embodiment as times from when the vehicle V is detected to when the vehicle reaches the second point L ₂ and the third point L _3. Alternatively, the speed of the vehicle V may be measured by the vehicle detector 30 and obtained based on the speed.
As long as the vehicle detector 30 detects the vehicle V, any detection means may be adopted. As the vehicle detector 30, for example, a Doppler radar that measures the speed of the vehicle V can be used. The vehicle detector 30 using the Doppler radar, to the first point L ₁ emits radar waves of a predetermined frequency, it is possible to measure the velocity by detecting a reflected wave when the vehicle V has reached its position. Moreover, the vehicle detector 30 can be integrally provided in the display part 10, as shown in FIG.

As described above, the times T ₁ and T ₂ are detected by the vehicle detector 30 as the time from when the vehicle V is detected until it reaches the second point L ₂ and the third point L _3. Can be calculated based on the speed. That is, for example, when the detected speed of the vehicle V is 60 km / h and L ₁ -L ₂ and L ₁ -L ₃ are 120 m and 220 m, respectively, the times T ₁ and T ₂ are 7.2 seconds and 13. 2 seconds. In the second embodiment, it is determined that the vehicle V has reached the second point L ₂ and the third point L ₃ with the passage of the times T ₁ and T ₂ .
Incidentally, so as to detect the vehicle V at the position of the first point L ₁ beyond, to perform switching of lighting sets the time as a timer until the vehicle V reaches the third location L ₃ from being detected It may be.

(2-2) Display control method of information display device:
The display control of the information display apparatus according to the second embodiment is executed according to the flowchart shown in FIG.
First, the information display device 1A monitors whether there is a lighting instruction by a display control signal (step S200). At this time, the information display device 1A is in the off state. If there is no lighting instruction, the light-off state is continuously maintained in step S205, and it is continuously monitored whether there is a lighting instruction. If there is a lighting instruction, the process proceeds to step S210.

In step S210, whether there is a vehicle detection signal, i.e., it monitors whether there is a vehicle to reach the first location L _1. If there is no vehicle detection signal, the light-off state is continuously maintained in step S205, and if there is a vehicle detection signal, the process proceeds to step S210. If there is vehicle detection signal in step S210, the timer set time _{T 1} and _{T 2} (step S215). As described above, T ₁ and T ₂ are times from when the vehicle V is detected until the second point L ₂ and the third point L ₃ are reached. The time T ₁ and T _2, as described above, when using a Doppler radar, respectively based on the speed of the vehicle V obtained from the reflected waves received upon detection of the vehicle V calculated as the vehicle detector 30 Can be calculated.

  Next, the luminance selection unit 53d selects the luminances of the display unit 10 and the caution lamp 20 (step S220). That is, the luminance selection unit 53d matches the ambient illuminance detected by the illuminance detector 40 with the luminance table data 52c, and selects the luminance according to the illuminance. The brightness table data 52c to be collated at this time is data used for the second lighting state. Then, the display control unit 53a and the caution light control unit 53b turn on the display unit 10 and the caution light 20, respectively, with the luminance used for the selected second lighting state (step S225). In step S220, the luminance selection unit 53d collates the ambient illuminance detected by the illuminance detector 40 with data used for the first lighting state, and switches to the first lighting state in step S235 described later. The brightness of the display unit 10 and the caution light 20 is also selected at the same time.

At step S230, the whether or not the timer set time T ₁ is elapsed in step S215, the i.e., monitors whether the vehicle V has reached the second point L _2. When the time T ₁ is passed from the second lighting condition, switching to a first lighting state is a lighting state for causing the read traffic information. In other words, the display unit 10 and the caution lamp 20 are turned on by switching to the first display luminance and the first lighting luminance (step S235). Thereafter, it is monitored whether or not the time T ₂ has elapsed, that is, whether or not the vehicle V has reached the third point L ₃ (step S240). When the time T ₂ has elapsed, the processing after step S245 is performed. The first lighting state is extended. Since the processes in steps S245 to S255 are the same as the processes in steps S145 to S155 in the flowchart of FIG. 5, detailed description thereof is omitted.

As described above, in the second embodiment, the lighting is switched to the three states of the first lighting state, the second lighting state, and the extinguishing state according to the position of the vehicle V. Thus, the vehicle V is, until it reaches the first location L ₁ is a detection position of the vehicle V can be an information display device 1A unlit, it is possible to further reduce the power consumption during device operation . In the range from the vehicle V is detected to reach the second point L _2, caution light 20 and the second lighting luminance is the first lighting luminance or higher luminance is a luminance in accordance with the ambient illuminance Lights on. As a result, before the position where the traffic information can be read, the driver of the vehicle V can be preliminarily recognized that the information display device 1 is displaying.

(3) Embodiment 3
An information display apparatus according to Embodiment 3 will be described. The information display apparatus according to the third embodiment has the configuration shown in FIGS. 2 and 3 as in the second embodiment, and the details thereof are substantially the same as those in the second embodiment. However, the present embodiment 3, the first point L ₁ of FIG. _6, but in the point of switching the lighting state at a second point L ₂ and the third point L ₃ are the same as those of Embodiment 2, the first point L ₁ Before the vehicle is detected, the difference is in controlling whether to turn off or switch to the second lighting state according to the importance of the display item to be displayed.
In the case of the third embodiment, the memory 52 stores a signal indicating the importance of an item with respect to the display item. Specifically, for example, if the item includes a high-significance display such as “No Traffic”, a “1” signal indicates that the item does not include such a display. Remembered.

Next, display control according to the third embodiment will be described with reference to the flowchart of FIG.
The display control of the third embodiment monitors whether or not there is a lighting instruction by a display control signal, and when there is no lighting instruction, the display unit 10 and the caution light 20 are turned off to continue whether or not there is a lighting instruction. The process up to the point where the monitoring is continued is the same as in the second embodiment. If there is a lighting instruction in step S300, whether the signal indicating the importance stored in the memory 52 is “1” or “0”, that is, a display of a high importance is displayed in the display item. Whether or not it is included is monitored (step S310).

If the importance level signal is “1”, the brightness of the display unit 10 and the caution light 20 is selected (step S315), and the display unit 10 and Each of the caution lights 20 is turned on (step S320). In this state, whether there is a vehicle detection signal, i.e., it monitors whether there is a vehicle V reaches the first point L ₁ (step S325). When there is no vehicle detection signal, the process returns to step S300, and the processes of steps S310, S315, and S320 described above are repeated to continue the second lighting state. If there is a vehicle detection signal, the time _{T 1} and _{T 2} at step S330 to the timer setting, the process proceeds to step S355.
On the other hand, if the signal is “0” in step S310, the presence or absence of the vehicle detection signal is monitored in step S335 while the light is off. Since the processing after step S340 is the same as the flow after step S215 in the second embodiment, a description thereof will be omitted.

  Thus, in this Embodiment 3, when a display item is high in importance, it is lit in the second lighting state even before the vehicle is detected. As a result, the risk of the driver overlooking important display items can be greatly reduced.

(4) Other Embodiments The present invention is not limited to the above-described first and second embodiments, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the first and second embodiments described above, the display unit 10 and the caution light 20 are provided. However, the present invention is not limited to this. For example, as shown in FIG. The information display device 1B may be configured to function as a caution light 20A for alerting that traffic information is being displayed. That is, this makes it possible to call attention beyond the readable range of traffic information even in an information display device that does not include a warning light. Further, the arrangement of the caution light 20A can be freely changed within the display range of the display unit 10A.

  In the first embodiment, the time T is set in advance. However, the present invention is not limited to this. For example, as illustrated in the second and third embodiments, the vehicle detector 30 controls the speed of the vehicle V. The time T may be obtained by calculation based on this speed.

  Furthermore, in the above-described first to third embodiments, one vehicle detector 30 is provided, and the lighting state is switched by setting a timer based on the detection signal. However, the present invention is not limited to this. A plurality of vehicle detectors for detecting the vehicle may be provided, and the lighting state may be switched by a detection signal of each vehicle detector.

  In the above-described second and third embodiments, the speed of the vehicle V is measured by the single vehicle detector 30. However, the present invention is not limited to this. For example, two vehicles that detect the vehicle at two different points. You may make it measure the speed of a vehicle based on the difference of those detection time using a detector.

1, 1A, 1B; information display device, 10, 10A; display unit, 20, 20A; warning light, 30; vehicle detector, 40; illuminance detector, 50; control unit, 51; receiving unit, 52; 52a; Traffic information display program, 52b; Display information data, 52c; Luminance table data, 53a; Display control unit, 53b; Caution light control unit, 53c; Timer setting unit, 53d; Luminance selection unit, L ₁ ; , L ₂ ; second point, L ₃ ; third point, V; vehicle.

Claims (14)

A display unit that displays traffic information toward a vehicle approaching from a predetermined direction; a caution light that is provided near the display unit and is lit to alert that the traffic information is displayed; and the display An information display device comprising: an illuminance detector that detects the ambient illuminance of the unit; a vehicle detector that detects the vehicle; and a control unit that switches a lighting state of the display unit and the caution light according to a position of the vehicle. Display control method,
When the vehicle detector detects the vehicle at a first point, switching the lighting state to a first lighting state that is a lighting state for reading the traffic information;
Switching the lighting state to a second lighting state that is a lighting state for calling attention to the traffic information being displayed when it is determined that the vehicle has reached the second point. ,
Between the first point and the second point includes a legible range in which the traffic information can be read from the vehicle,
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. A display control method for an information display device, wherein the display control method is a lighting state in which lighting is performed with luminance or lighting is performed with the first lighting luminance.   The display control method for an information display device according to claim 1, wherein the control unit determines that the vehicle has reached the second point when a predetermined time has elapsed since the vehicle was detected at the first point. .   The display control method for an information display device according to claim 1, wherein the vehicle detector is a millimeter wave radar provided in the vicinity of the display unit. A display unit that displays traffic information toward a vehicle approaching from a predetermined direction; a caution light that is provided near the display unit and is lit to alert that the traffic information is displayed; and the display An information display device comprising: an illuminance detector that detects the ambient illuminance of the unit; a vehicle detector that detects the vehicle; and a control unit that switches a lighting state of the display unit and the caution light according to a position of the vehicle. Display control method,
When the vehicle detector detects the vehicle at a first point, switching the lighting state to a second lighting state that is a lighting state for calling attention to the traffic information being displayed; and ,
When it is determined that the vehicle has reached a second point, the step of switching the lighting state to a first lighting state that is a lighting state for reading the traffic information;
When it is determined that the vehicle has reached a third point, the lighting state is switched to the extinguishing state,
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. A display control method for an information display device, wherein the display control method is a lighting state in which lighting is performed with luminance or lighting is performed with the first lighting luminance. A display unit that displays traffic information toward a vehicle approaching from a predetermined direction; a caution light that is provided near the display unit and is lit to alert that the traffic information is displayed; and the display An information display device comprising: an illuminance detector that detects the ambient illuminance of the unit; a vehicle detector that detects the vehicle; and a control unit that switches a lighting state of the display unit and the caution light according to a position of the vehicle. Display control method,
When the vehicle detector detects the vehicle at a first point, switching the lighting state to a second lighting state that is a lighting state for calling attention to the traffic information being displayed; and ,
When it is determined that the vehicle has reached a second point, the step of switching the lighting state to a first lighting state that is a lighting state for reading the traffic information;
When it is determined that the vehicle has reached a third point, the lighting state is switched to the extinguishing state or the second lighting state according to the importance of the display item displayed on the display unit,
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. A display control method for an information display device, wherein the display control method is a lighting state in which lighting is performed with luminance or lighting is performed with the first lighting luminance.   The controller determines that the vehicle has reached the second point when a first time has elapsed since the vehicle was detected at the first point, and the vehicle is detected at the first point. The display control method for an information display device according to claim 4 or 5, wherein when the second time has elapsed, the vehicle is determined to have reached the third point. The vehicle detector is a Doppler radar that is provided in the vicinity of the display unit and detects the speed of the vehicle.
The display control method of the information display device according to claim 6, wherein the control unit sets the first time and the second time based on the speed of the vehicle detected at the first point. A display unit for displaying traffic information toward a vehicle approaching from a predetermined direction;
A caution light that is lit to alert that the traffic information is displayed in the vicinity of the display unit;
An illuminance detector for detecting the ambient illuminance of the display unit;
A vehicle detector for detecting the vehicle;
A control unit that switches a lighting state of the display unit and the caution light according to the position of the vehicle,
The controller switches the lighting state to a first lighting state which is a lighting state for causing the traffic information to be read when the vehicle is detected at the first point by the vehicle detector. Switch to the second lighting state, which is a lighting state to call attention to the fact that the traffic information is displayed when it is determined that has reached the second point,
Between the first point and the second point includes a legible range in which the traffic information can be read from the vehicle,
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. An information display device characterized by being in a lighting state in which lighting is performed with luminance or lighting with the first lighting luminance.   The information display device according to claim 8, wherein the control unit determines that the vehicle has reached the second point when a predetermined time has elapsed since the vehicle was detected at the first point.   The information display device according to claim 8 or 9, wherein the vehicle detector is a millimeter wave radar provided in the vicinity of the display unit. A display unit for displaying traffic information toward a vehicle approaching from a predetermined direction;
A caution light that is lit to alert that the traffic information is displayed in the vicinity of the display unit;
An illuminance detector for detecting the ambient illuminance of the display unit;
A vehicle detector for detecting the vehicle;
A control unit that switches a lighting state of the display unit and the caution light according to the position of the vehicle,
The control unit is a second lighting state for calling attention to the fact that the traffic information is displayed when the vehicle is detected at the first point by the vehicle detector. Switch to the lighting state, and then switch to the first lighting state, which is a lighting state for reading the traffic information when it is determined that the vehicle has reached the second point, and the vehicle reaches the third point. When it is determined that the
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. An information display device characterized by being in a lighting state in which lighting is performed with luminance or lighting with the first lighting luminance. A display unit for displaying traffic information toward a vehicle approaching from a predetermined direction;
A caution light that is lit to alert that the traffic information is displayed in the vicinity of the display unit;
An illuminance detector for detecting the ambient illuminance of the display unit;
A vehicle detector for detecting the vehicle;
A control unit that switches a lighting state of the display unit and the caution light according to the position of the vehicle,
The control unit is a second lighting state for calling attention to the fact that the traffic information is displayed when the vehicle is detected at the first point by the vehicle detector. Switch to the lighting state, and then switch to the first lighting state, which is a lighting state for reading the traffic information when it is determined that the vehicle has reached the second point, and the vehicle reaches the third point. Switching to the unlit state or the second lit state according to the importance of the display item displayed on the display unit when it is determined that
A legible range in which the traffic information can be read from the vehicle is included between the second point and the third point.
In the first lighting state, the display unit is turned on at a first display luminance that is a luminance corresponding to the ambient illuminance, and the caution lamp is turned on at a first lighting luminance that is a luminance corresponding to the ambient illuminance. It is lit,
In the second lighting state, the display unit is turned on at a second display brightness that is lower than the first display brightness, and the caution lamp is turned on at a second brightness that is higher than the first lighting brightness. An information display device characterized by being in a lighting state in which lighting is performed with luminance or lighting with the first lighting luminance.   The controller determines that the vehicle has reached the second point when a first time has elapsed since the vehicle was detected at the first point, and the vehicle is detected at the first point. The information display device according to claim 11, wherein when the second time has elapsed, the vehicle determines that the vehicle has reached the third point. The vehicle detector is a Doppler radar that is provided in the vicinity of the display unit and detects the speed of the vehicle.
The information display device according to claim 13, wherein the control unit sets the first time and the second time based on a speed of the vehicle detected at the first point.

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