JPH1086770A - Approaching state displaying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inform the change of inter-vehicle distance for own car to the driver of a following car effectively and emphasize an approach feeling when the following car is approaching and urge an earlier speed reduction operation for the driver of the following car. SOLUTION: An inter-vehicle distance between a following car and own car is detected by an inter-vehicle distance detection device 4. A control device 5 calculates an inter-vehicle time while the following car catches up the own car from the change of the inter-vehicle distance. In response to a found out inter-vehicle time, the display pattern and display position of the indicator 10 arranged on the back surface of the own car are changed by the transmitting/shielding drive of a liquid crystal shutter 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an approach status display device for informing a driver of a following vehicle traveling at night of the approach status of a preceding vehicle.

[0002]

2. Related Art An apparatus for informing a driver of a following vehicle of an approaching state is disclosed in Japanese Patent Application No. 7-232254 by the present applicant.
No. 1993. This means that the driver of an approaching vehicle from behind can visually recognize the change in reflected light in response to the change in inter-vehicle distance, thereby displaying information on the inter-vehicle distance, and furthermore, the visual period of the reflected light in accordance with the approach speed. Is changed to display relative speed information.

[0003]

However, in the above-described device, the driver of the following vehicle is only allowed to visually recognize the flickering of reflected light and the change in luminance according to the predetermined inter-vehicle distance. Although the driver can recognize the relative speed based on the cycle of change, it is difficult to intuitively grasp the sense of distance, and it has been desired to display more accurate information on the distance between vehicles. In addition, when the vehicle is acclimating to the speed by prolonged high-speed driving, the distance between the vehicles may approach too soon, and it may not be noticed that the margin is reduced. It was desired to make the driver aware of this.

The present invention provides an approach state display device which makes it easy for a driver of a following vehicle to grasp the degree of allowance according to the inter-vehicle distance to the preceding vehicle and the approach speed, especially when driving at night. It is intended to be.

[0005]

FIG. 1 shows an embodiment of the present invention.
The first and second aspects of the present invention will be described with reference to FIG. 4 and FIG. 4. (1) The approach state display device according to the first aspect of the present invention detects the degree of approach of the following vehicle 110 to the own vehicle 100. Degree detecting means 4 and 5; approach degree detecting means 4 and 5
Display means 5, 6 and 10 for displaying at least the highest degree of approach in the first display mode and the lowest degree of approach in accordance with the signal from
The above object is achieved by providing the following. (2) According to a second aspect of the present invention, in the approach state display device according to the first aspect, the display means 5, 6, and 10 have left and right indicators 10 arranged at predetermined intervals in the vehicle width direction. The first display mode is different from the second display mode in that the outermost edges of the left and right indicators 10 in the vehicle width direction are farther apart. FIG. 1 showing an embodiment.
(3) According to the third aspect of the present invention, in the approach state display device according to the first aspect, the display means is provided at a predetermined interval in the vehicle width direction. And the high mount display 20 disposed at a position higher than the left and right displays 30 (30A). The first display mode is the second display mode.
In this display mode, the left and right display units 30 (30A) and the high-mount display unit 20 are spaced apart from each other in the vehicle height direction as compared with the display mode of FIG. (4) According to a fourth aspect of the present invention, in the approach state display device according to the third aspect, the high mount indicator 20 is configured to be able to change a display position in a vehicle vertical direction. (5) According to a fifth aspect of the present invention, in the approach state display device according to the fourth aspect, each of the left and right indicators 30A is configured to be able to change a display position in a vehicle vertical direction. (6) According to a sixth aspect of the present invention, in the approach state display device according to the fifth aspect, in the first display mode, the left and right indicators 30A are displayed at the lowest position, and the high-mount indicator 20 is positioned at the uppermost position. In the second display mode, the left and right displays 30A are displayed at the uppermost position, and the high mount display 20 is displayed at the lowermost position. (7) The invention according to claim 7 is the approach state display device according to any one of claims 1 to 6, wherein the display mode is shifted stepwise between the first display mode and the second display mode. 1
The approach state is displayed in the third display mode described above. (8) According to an eighth aspect of the present invention, in the approach state display device according to the first aspect, the display means 10 is configured such that the display form provided by the display light 11 and the display light 11 is variable. The liquid crystal shutter 12 has a liquid crystal shutter 12 whose transmission is shielded at an appropriate place. (9) According to a ninth aspect of the present invention, in the approach state display device according to any one of the second to sixth aspects, the indicator is a display lamp, and a display form provided on the front surface thereof is variable. And a liquid crystal shutter in which an appropriate portion is transparently shielded. (10) According to a tenth aspect of the present invention, in the approach state display device according to the first aspect, the display means is disposed on a reflector and is disposed on a front surface thereof and is transmitted through a proper position so that a display form by the reflector is variable. And a liquid crystal shutter 12 to be shielded. (11) According to an eleventh aspect of the present invention, in the approach state display device according to any one of the second to sixth aspects, the indicator is a reflector, and a display form provided on the front surface of the reflector is variable. And a liquid crystal shutter in which an appropriate portion is transparently shielded. (12) According to a twelfth aspect of the present invention, in the approach state display device according to the first aspect, the display means 10 has a plurality of light emitters that can be turned on or off at appropriate places so that the display form can be changed. Things. (13) According to a thirteenth aspect of the present invention, in the approach state display device according to any one of the second to sixth aspects, the display device is provided with a plurality of light-on or light-off positions that can be changed so that the display form is variable. It has a light emitting device.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0007]

【The invention's effect】

(1) According to the approach state display device of the present invention, the display mode of the display means is changed according to the detected degree of approach of the following vehicle, so that the approach state is displayed to the driver of the following vehicle. In this case, it is possible to provide an approach state display device that can display an enhanced sense of approach when the vehicle is running, and can prompt a subsequent driver to perform an early deceleration operation. (2) In particular, when a high-mount indicator is provided in addition to the right and left indicators as in claims 3 to 6, it is easier to recognize the degree of approach and to further emphasize the sense of approach. It is possible to provide an approach state display device that can perform the operation. (3) Further, as in claim 7, the approach state is changed in one or more third display forms in which the display form is shifted between the first display form and the second display form according to the degree of approach. Provided is an approach state display device that, when configured to display, enables a fine-grained display in accordance with the change even when the change in the degree of approach is small, and makes it easier to recognize the degree of approach. Is possible.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

-First Embodiment- Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a diagram showing the configuration of an approaching state display device according to the present invention. The approach state display device is an inter-vehicle distance detection device 4, a control device 5, a liquid crystal drive circuit (LCD driver).
6 and a display 10. This display 10
Is an indicator light 11 having a light source such as a tungsten lamp.
And a liquid crystal shutter 12 provided on the surface of the indicator light 11 to change the display shape of the indicator light 11.

FIG. 2 is a diagram showing a rear surface of a vehicle equipped with the approach state display device according to the present invention. As shown in FIG.
The display 10 is disposed near the stop lamp on the left and right sides of the rear surface of the vehicle. The control device 5 calculates the degree of approach of the following vehicle to the own vehicle based on the inter-vehicle distance between the own vehicle and the following vehicle detected by the detection device 4, and outputs the output from the control device 5 according to the degree of approach. The liquid crystal shutter 12 is driven to open and close via the liquid crystal driver 6 in response to the control signal to change the display shape.

FIG. 3 is a diagram showing the segment arrangement of the liquid crystal shutter 12 of the display 10 provided symmetrically on the left and right of the rear surface of the vehicle. The left and right sides are the same except that the arrangement shape is symmetrical.
Are provided, two segments 12b are provided in the lower stage, and three segments 12c are provided in the lower stage. Thus, nine segments 12i are provided in the lowermost stage, and each segment is independent. Open / close control.

As shown in FIG. 4, when the following vehicle 110 follows the preceding vehicle 100 at an inter-vehicle distance L1 (L2), the approaching state display device according to the first embodiment of the present invention detects the inter-vehicle distance. Time-dependent change (L1-L2) of the inter-vehicle distance information between the own vehicle 100 and the following vehicle 110 obtained by the device 4
If both vehicles continue to maintain the vehicle speed at that time, the time until the following vehicle 110 catches up with the own vehicle 100 (hereinafter, this time is referred to as the inter-vehicle time) is used as the control device 5. It is calculated by: Then, the liquid crystal shutter 12 is driven via the LCD driver 6 according to the calculated inter-vehicle time, and a predetermined portion of the liquid crystal shutter 12 including a plurality of segments is transmitted and shielded. Then, by transmitting light from a predetermined transmitting portion, the display shape of the display 10 is changed according to the inter-vehicle time, and the approaching state is displayed to the driver of the following vehicle 110.

Here, the inter-vehicle distance detecting device 4 detects the inter-vehicle distance with the following vehicle 110 using a laser radar as disclosed in Japanese Utility Model Application Laid-Open No. Hei 6-71333, or detects the following vehicle 110 with an illuminance sensor. A device that detects the inter-vehicle distance from a change in the brightness of the headlamp light can be used. The indicator lamp 11 is a tungsten ball or LE.
A device that emits light by itself, such as a D or FL device, can be used. Further, instead of the indicator light 11, a reflector that reflects headlight light of a following vehicle can be used.

Next, referring to FIG. 5, the procedure for calculating the inter-vehicle time in the control device 5 will be described. In step S11, the following distance L from the following vehicle 110 is obtained from the following distance detecting device 4 by the following distance detecting device 4.
Enter 1. After waiting for a predetermined time tms in step S12, the inter-vehicle distance detection device 4 is again activated in step S13.
Then, an inter-vehicle distance L2 with the following vehicle 110 is input. Subsequently, in step S14, the approach speed Va of the following vehicle 110 is calculated, and in step S15, the inter-vehicle time ta is calculated. Based on the inter-vehicle time ta obtained in step S15, the transmission shape of the liquid crystal shutter 12 is determined in step S16, and the liquid crystal shutter 12 is driven based on the determined shape. Since then
The processing of S11 to S16 is repeated at predetermined time intervals.

Here, the inter-vehicle time determined by the inter-vehicle distance between the own vehicle 100 and the following vehicle 110 and the approach speed of the following vehicle 110 to the own vehicle 100 will be described with reference to FIGS. As shown in FIG. 4, when the following vehicle 110 is approaching the own vehicle 100, the degree of margin represented by the following time varies depending on the approach speed of the following vehicle 110 even at the same inter-vehicle distance. .

That is, the following vehicle 11 with respect to the own vehicle 100
0 approach speed is 50 km / h and 100 km
As is clear from FIG. 6 showing the relationship between the inter-vehicle distance and the inter-vehicle time in the case of m / h, even if the inter-vehicle distance is the same, if the approach speed doubles, the inter-vehicle time is halved.

Next, a description will be given of an example of what kind of deceleration operation is performed when a driver finds a vehicle (an obstacle) stopped ahead. FIG. 7 and FIG. 8 show that when traveling at 100 km / h in the visibility test, a parked vehicle was found ahead and a normal deceleration operation was performed.
It shows how the relationship between the inter-vehicle distance and the inter-vehicle time has changed. The deceleration operation differs depending on the driver, and when the inter-vehicle distance is 60 m, the subject A in FIG. 7 has an inter-vehicle time of about 3.4 seconds, whereas the subject B in FIG. It can be seen that the subject B does not have the deceleration operation with less room. On the other hand, the display according to the margin allows the driver of the following vehicle to be prompted to perform the brake operation by the timing and the pedaling force according to the degree of approach.

That is, in the approach state display device according to the present invention, the points P1, P2,.
By changing the transmission shape of the liquid crystal shutter 12 at each timing at which the inter-vehicle time falls below a predetermined length, such as Pn, the driver of the succeeding vehicle 110 receives the predetermined inter-vehicle time P
Each time the vehicle crosses 1, P2,..., Pn, the shape and arrangement of the indicator 10 of the preceding vehicle appear to change.

Further, in a situation where the inter-vehicle time is sharply shortened, such as when the deceleration operation is performed by the subject B shown in FIG. 8, the cycle of changing the light emission shape and the position of the display 10 is also accelerated. The driver of the vehicle 110 can easily recognize the degree of the margin and the change in the margin according to the approach speed to the preceding vehicle and the inter-vehicle distance, and can prompt the deceleration operation at more accurate braking timing.

Subsequently, the display 10 using the liquid crystal shutter 12
The method of changing the light emission shape and the light emission position will be described with reference to FIG. 9A, each square surrounded by a solid line represents each segment 12a to 12i of the liquid crystal shirt, and P1,..., Pn attached to each segment are shown on the graphs shown in FIGS. The segments that enter the transparent state at the indicated inter-vehicle times P1,..., Pn are shown.

The segments of the liquid crystal shutter 12 are shown in FIG.
By arranging as shown in FIG.
In the state P1 in which the inter-vehicle time is shortest, that is, the degree of approach is the highest, as shown in FIG. The selected segment into a transparent state. In this case, the segment 12a and the segments 12b, 12
Three of the segments c outside the vehicle are set in a transparent state.
Conversely, in Pn in which the following vehicle 110 has the longest inter-vehicle time with respect to the own vehicle 100, that is, Pn in a state where the degree of approach is the lowest, as shown in FIG.
In addition, the segment disposed at a lower position near the center in the width direction of the vehicle is made transparent. In this case, segment 12
Three of i near the center of the vehicle are in a transparent state.

At P2, which is longer than P1, the inter-vehicle time is shown in FIG.
In (a), a total of four segments, two of the segments 12b and two segments 12c out of the segments 12c, indicated by P2, are made transparent so as to have a square display form slightly moved toward the center of the vehicle. On the other hand, Pn−
1, segment 12 indicated by Pn-1 in FIG.
The display form is a square display form which is slightly moved to the outside of the vehicle by passing through the second and third inboards of i and the two inboards of the segment 12h.

In this manner, as the degree of approach increases, that is, as the inter-vehicle time decreases, the display 10
The shape of the light emitted from the light source is changed from horizontal to vertical, and the light emission position is changed from inside, from the middle to the top, and from the outside.

From the experimental results of the visibility, it has been confirmed that the longer the display shape of the display device 10 is, the faster the braking timing of the following vehicle 110 is. Decreases, the display shape of the display 10 becomes vertically long. Therefore, it is possible to display to the driver of the following vehicle 110 that the inter-vehicle time has changed, and to emphasize the sense of approach, thereby prompting an early deceleration operation.

In the description of the first embodiment, the display segment of the liquid crystal shutter 12 is square and the indicator lamp 1
Although the example of disposing them on the surface of No. 1 has been described, nineteen segments 22a having different shapes as shown in FIG.
Alternatively, a liquid crystal shutter 22 having an arrangement of ２２22 s may be used. A method of changing the light emission shape and the light emission position of the display 10 by the liquid crystal shutter 22 will be described with reference to FIG. In FIG. 11A, P1,..., Pn assigned to each of the segments 22a to 22s of the liquid crystal shutter 22 are in the transmissive state at the inter-vehicle times P1,..., Pn shown in the graphs shown in FIGS. This is the same as that of FIG.

In the case of P1, which has the highest degree of approach, that is, the shortest approach time, the two segments 22a and 22b marked with P1 are opened to open the P1 in FIG.
The display shape is as shown in FIG. Conversely, for Pn with the lowest degree of approach, that is, Pn with the longest approach time, three segments 22p, 22r, and 22s marked with Pn
Is opened to obtain a display shape as shown in FIG.

With the arrangement and shape of the segments as shown in FIG. 11, the same effect can be obtained with a liquid crystal shutter having a smaller number of segments as compared with that of FIG.

Further, the liquid crystal shutter 12 shown in FIG.
12, the liquid crystal shutter 32 in which strip-shaped segments 32a to 32i are arranged in a horizontal line as shown in FIG. In the approach display device shown in FIG. 12, depending on the state of the degree of approach, FIG.
As shown in FIG. 13C, the transmission portions of the liquid crystal shutters 12 arranged on the surfaces of the left and right indicator lights 11 can be sequentially changed from the inside to the outside. As a result, the driver of the following vehicle 110 has a high degree of approach, that is, as the inter-vehicle time becomes shorter, the light-emitting portion of the display 10 appears to expand in the vehicle width direction. It should be noted that the display in FIG. 13B shows the segments 32a to 32a to which P1 is added in FIG.
13c is made transparent, and the display of FIG. 13 (c) shows the segments 32g-32 with Pn of FIG. 13 (a).
This is performed with i being in a transmission state.

From the experimental results of visibility, it has been confirmed that widening the display intervals of the indicators 10 arranged on the left and right sides of the vehicle increases the braking timing of the driver of the following vehicle. With such a configuration, the driver of the succeeding vehicle 110 is notified that the inter-vehicle time has changed, and as the inter-vehicle time decreases,
The display intervals of the display devices arranged on the left and right sides of the vehicle are widened, the sense of approach is emphasized, and an early deceleration operation can be encouraged.

Second Embodiment Next, a second embodiment will be described with reference to FIG. In the description of the first embodiment, an example in which the display 10 having the liquid crystal shutter 12 on the surface is disposed on the left and right of the rear surface of the vehicle has been described. However, the approaching state display device according to the second embodiment has The high mount display 20 having the liquid crystal shutter 52 and the display 30 provided at the same height position as the tail lamp 50 are configured.

In FIG. 14A, the high mount indicator 20 is installed at a position higher than the position where the tail lamp 50 is mounted. The segments of the liquid crystal shutter 52 of the high mount display 20 are shown in FIGS.
As shown in FIG.
d is arranged vertically.

Then, at P1, which is the closest to the following vehicle 110, that is, at P1, which is the shortest inter-vehicle time, the segment 52a arranged at a high position is made transparent.
Conversely, at Pn where the degree of approach to the following vehicle 110 is the lowest, that is, at Pn where the inter-vehicle time is the longest, the segment 52d disposed at the lower position is made to be in the transparent state. As a result, as the inter-vehicle time becomes shorter, the position of the light emitting portion of the high mount display 20 is changed from the state shown in FIG.
The state changes to the state shown in FIG.

From the experimental results of visibility, the provision of the high-mount indicator 20 makes it easier to recognize the degree of approach as compared with the case where the display 30 is simply arranged on the left and right sides of the rear surface of the vehicle, and provides a high-mount indicator. It has been confirmed that the higher the position of the indicator 20 with respect to the mounting height of the indicators 30 arranged on the left and right, the earlier the brake timing of the driver of the following vehicle 110 becomes. Therefore, by adopting the configuration according to the second embodiment of the present invention shown in FIG. 14A, as the inter-vehicle time decreases, the light-emitting portions of the display 30 provided on the left and right and the high-mount display 20 The distance in the height direction with the light-emitting portion of the vehicle becomes wider, and the driver of the following vehicle 110 displays that the inter-vehicle time is decreasing, emphasizes the sense of approach, and performs an early deceleration operation. Can be encouraged.

Third Embodiment In the second embodiment, the example in which the high mount display 20 having the liquid crystal shutter 52 on the surface is installed has been described, but the approach state display device according to the third embodiment is described. Figure 1
As shown in FIG. 5A, a display 30A having a liquid crystal shutter 42 on its surface and a high mount display 20 having a liquid crystal shutter 52 on its surface are disposed on the left and right sides of the rear surface of the vehicle at the same height as the tail lamp 50. It is composed of
In FIG. 15, FIG. 14 showing the second embodiment is shown.
The same parts as those described above are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 15A, the liquid crystal shutter 52 of the high mount display 20 is the same as that of the second embodiment, and is installed on each surface of the display 30A disposed on the left and right of the rear surface of the vehicle. The liquid crystal shutter 42 has vertically long segments 42a to 42d.

Then, at the point P1 where the degree of approach is the highest, that is, the inter-vehicle time with the following vehicle 110 is the shortest, the segment 52a arranged at a high position of the liquid crystal shutter 52 of the high mount display 20 is made to be in a transparent state. The segment 42a disposed at a lower position of the liquid crystal shutter 42 of the display 30A disposed on the left and right is made to be in a transmitting state (see FIG. 15B). Conversely, at Pn where the degree of approach is the lowest, that is, at Pn where the inter-vehicle time with the succeeding vehicle 110 is the longest, the segment 52d, which is disposed at a low position of the liquid crystal shutter 52 of the high-mount display 20, is made transparent, and The segment 42d disposed at a high position of the liquid crystal shutter 42 of the disposed display 30A is made to be in a transmissive state (see FIG. 15C).

By arranging the segments of the liquid crystal shutters 42 and 52 and driving the transmission shield as described above, in P1 having the shortest inter-vehicle time, the display 30A and the high-mount display 20 disposed on the left and right are provided. Figure 1
The position shown in FIG. 5B emits light, while the position shown in FIG. 15C emits light in Pn with the longest inter-vehicle time.

With the above-described configuration, as the inter-vehicle time decreases, the left and right indicators 30A are provided.
15 (b) and 15 (c), the difference between the height of the light emitting portion of the high mount display 20 and the height of the light emitting portion of the high mount indicator 20 appears to be widened. In addition to displaying that the vehicle is being operated, it is possible to further emphasize the sense of approach more than in the second embodiment, and to prompt an early deceleration operation.

-Modified Example- In the above description of the first to third embodiments, the light emitted from the indicator light 11 or the reflector (not shown) using the liquid crystal shutters 12, 22, 32, 42, and 52 is used. Although the example in which the display is performed in the predetermined display mode has been described, the following may be performed. That is, in the configuration of the first embodiment shown in FIG.
Is omitted, the display 10 is an aggregate of a plurality of active light-emitting elements such as LEDs, lamps, or EL elements, and the lighting or extinguishing of the segments constituting the aggregate of these active light-emitting elements is replaced by the LCD driver 6. The control may be performed by a driver for driving the light emitting element.

Further, as an example, even when the vehicle is traveling at the same inter-vehicle distance of 40 m, the degree of approach differs when the traveling speed is 40 km / h and when the traveling speed is 80 km / h. The degree of approach is higher in the case.
Therefore, in the approach state display device according to the present invention, as shown in FIG. 16, depending on the traveling speed of the own vehicle or the inter-vehicle distance to the following vehicle, any one of FIG. 9, FIG. It may be determined which of the display segments P1 to Pn of the approach state display device to be displayed is to be in the display state. That is, with reference to FIG. 16, the following distance is 40 m, and the own vehicle traveling speed is 40 hours / hour.
In the case of Km / h, the display segment with P3 is displayed as shown by the point (a), while the same inter-vehicle distance of 40 m
If the traveling speed of the own vehicle is 80 km / h, the display segment marked with P2 is displayed as shown by the point (b) to indicate that the degree of approach is high. Can be displayed.

In the correspondence between the above-described embodiment and the claims, the control device 5, the LCD driver 6, and the display 10 constitute display means, and the following distance detection device 4 and the control device 5 constitute approach degree detection means. I do.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of an approach state display device according to the present invention.

FIG. 2 is a diagram showing an example of a mounting position of an approach state indicator according to the present invention.

FIG. 3 is a diagram showing a segment shape and an arrangement of the liquid crystal shutter according to the first embodiment.

FIG. 4 is a diagram showing a relationship between a host vehicle and a following vehicle.

FIG. 5 is a flowchart showing an inter-vehicle time calculation processing procedure;

FIG. 6 is a diagram showing the relationship between the inter-vehicle distance and the inter-vehicle time when the approach speeds are different.

FIG. 7 is a diagram showing the relationship between the inter-vehicle distance and the inter-vehicle time during a deceleration operation (subject A).

FIG. 8 is a diagram showing the relationship between the inter-vehicle distance and the inter-vehicle time during a deceleration operation (subject B).

9A and 9B are explanatory diagrams of a display example of the approach state display device according to the first embodiment, in which FIG. 9A illustrates a segment of a liquid crystal shutter provided on the surface of the display, and FIG. (C) shows the display mode when the approach time is the longest.

FIG. 10 is a diagram showing a segment shape and arrangement of another liquid crystal shutter according to the first embodiment.

FIGS. 11A and 11B are explanatory diagrams of display examples of the approach state display device according to another example of the first embodiment, in which FIG. 11A shows a segment of a liquid crystal shutter provided on the surface of the display, and FIG. Shows a display mode when the approach time is shortest, and (c) shows a display mode when the approach time is longest.

FIG. 12 is a diagram showing a segment shape and arrangement of a liquid crystal shutter according to still another example of the first embodiment.

FIG. 13 is an explanatory diagram of a display example of an approach state display device according to still another example of the first embodiment, wherein (a) illustrates a segment of a liquid crystal shutter provided on the surface of the display;
(B) shows the display form when the approach time is the shortest, and (c)
Indicates a display mode when the approach time is the longest.

14A and 14B are explanatory diagrams of a display example of the approach display device according to the second embodiment, where FIG. 14A illustrates an arrangement position of a display;
(B) shows the display form when the approach time is the shortest, and (c)
Indicates a display mode when the approach time is the longest.

FIG. 15 is an explanatory diagram of a display example of the approach display device according to the third embodiment, where (a) shows a display position of the display;
(B) shows the display form when the approach time is the shortest, and (c)
Indicates a display mode when the approach time is the longest.

FIG. 16 is a graph showing an example of a criterion when the display mode is changed in accordance with a change in the running speed of the own vehicle or the distance between the vehicle and a following vehicle in the approach display device according to the modified example.

[Explanation of symbols]

 4 Inter-vehicle distance detection device 5 Control device 6 LCD driver 10, 30, 30A Display device 20 High mount display device 11 Indicator light 12, 22, 32, 42, 52 Liquid crystal shutter 50 Tail lamp 100 Own vehicle 110 Subsequent vehicle

Claims (13)

[Claims] 1. An approach detecting means for detecting an approach of a following vehicle to an own vehicle, and a first display at least when the approach is at least highest in response to a signal from the approach detecting means. Display means for displaying in a second form when the degree of approach is the lowest. 2. The approach state display device according to claim 1, wherein the display means has left and right indicators arranged at predetermined intervals in a vehicle width direction, and the first display mode is the second display mode. An approaching state display device, wherein the left and right indicators are separated from the outermost edges of the display section in the vehicle width direction in comparison with the display mode. 3. The approach state display device according to claim 1, wherein the display means is disposed at right and left indicators arranged at predetermined intervals in a vehicle width direction, and at a position higher than the left and right indicators. A display in which the first display mode is separated from the second display mode by a distance in the vehicle height direction between the left and right displays and the high mount display. An approach state display device characterized by being in a form. 4. The approach state display device according to claim 3, wherein the high mount indicator is configured to be able to change a display position in a vehicle vertical direction. 5. The approach state display device according to claim 4, wherein each of the left and right indicators is configured to be able to change a display position in a vehicle vertical direction. 6. The approach state display device according to claim 5, wherein in the first display mode, the left and right indicators are displayed at a lowermost position, the high mount indicator is displayed at an uppermost position, In the second display mode, the left and right indicators are displayed at an uppermost position, and the high mount indicator is displayed at a lowermost position. 7. The approach state display device according to claim 1, wherein at least one of a third display mode and a third display mode that shifts a display mode between the first display mode and the second display mode in a stepwise manner.
An approach state display device configured to display the approach state in the display form of (1). 8. The approach state display device according to claim 1, wherein the display means includes a display lamp, and a liquid crystal disposed at a front surface of the display unit and adapted to allow a display form by the display lamp to be variable in a transparent position. An approach state display device comprising a shutter. 9. The approach state display device according to claim 2, wherein the indicator is provided at an appropriate position such that a display form provided on a front surface thereof and a display form by the indicator light is variable. An approach state display device comprising: a liquid crystal shutter that is transparently shielded. 10. The approach state display device according to claim 1, wherein the display means is a reflector, and a liquid crystal is disposed on a front surface of the reflector, and the liquid crystal is selectively shielded at an appropriate position so that a display form of the reflector can be changed. An approach state display device comprising a shutter. 11. The approach state display device according to claim 2, wherein the display is provided with a reflector and an appropriate position such that a display form provided by the reflector is variable. An approach state display device comprising: a liquid crystal shutter that is transparently shielded. 12. The approach state display device according to claim 1, wherein the display means has a plurality of light emitters that can be turned on or off at appropriate places so that the display form can be changed. Approach status display device. 13. The approach state display device according to claim 2, wherein the display has a plurality of light emitters that can be turned on or off at appropriate places so that the display form can be changed. An approach state display device characterized by the above-mentioned.