JP5797155B2 - Driving support display device for rear window - Google Patents

Description

  The present invention relates to a driving support display device for a rear window behind a vehicle.

As driving assistance at the time of driving a car, there is one that displays an image behind the vehicle on an in-vehicle monitor or a windshield.
However, in the case of such a display, there is a problem that it is difficult to grasp the sense of direction intuitively because it is displayed in the direction opposite to the actual traveling direction, and the actual sense of distance is difficult to grasp because the display size is reduced. .

  In order to solve such a problem, for example, Patent Document 1 discloses a system that displays an image of the rear of a vehicle captured by an infrared camera on a rear window using a head-up display.

JP 2004-350228 A

  However, in the conventional technology such as Patent Document 1, for example, when the user wants to check the rear of the vehicle over a wide area rather than in the vicinity of the vehicle, the camera image is displayed on the rear window, which is not necessarily driving assistance. There was a problem. Moreover, when it is desired to check the vicinity of the vehicle, such as in a parking lot, there is a problem that it is difficult to recognize the vehicle width, the white line, etc., and the driving assistance is not provided.

  The present invention has been made to solve the above-described problems, and provides a driving assistance display device capable of providing driving assistance to the rear window in accordance with the needs of the driver and the situation of the vehicle. The purpose is to do.

In order to achieve the above object, the present invention provides a driving support display device for a rear window of a vehicle, a camera that acquires video information behind the vehicle, and an obstacle that detects the obstacle behind the vehicle. An obstacle detection sensor that acquires a distance to the vehicle, a shift position detection unit that detects a position of a shift lever of the vehicle, a display unit that displays at least video information acquired by the camera on the rear window, and the camera To control the contents to be displayed on the display unit based on the video information acquired by the obstacle detection information, the obstacle information acquired by the obstacle detection sensor, and the position of the shift lever detected by the shift position detection unit. and a control unit, if the distance is greater than the threshold of the obstacle detection obstacle obtained by the sensor from the rear window To display the vehicle width guide line of the vehicle rear of the vehicle to the scene to be certified in the first display state of being superimposed, the case where the distance between the obstacle is less than the threshold value, the vehicle rear by the camera The camera is characterized in that it has switching means that can be switched to display in the second display state in which at least the vehicle width reference line is superimposed and displayed after the photographed camera image is displayed on the rear window.

  According to the driving support display device of the present invention, in accordance with the driver's needs and the situation of the vehicle, the vehicle width guide line is superimposed on the rear view of the vehicle, and the vehicle width guide line is superimposed on the scenery behind the vehicle. Therefore, the driver can be provided with more appropriate driving assistance.

1 is a block diagram showing an overall configuration of a driving assistance display device in Embodiment 1. FIG. 3 is a schematic diagram illustrating an arrangement relationship of components of the driving assistance display device in Embodiment 1. FIG. It is a display example which shows the 1st display state to a rear window. It is a display example which shows the 2nd display state to a rear window. It is a display example which shows the 3rd display state to a rear window. It is a flowchart which shows the automatic switching method which switches automatically three display states, a 1st display state, a 2nd display state, and a 3rd display state. FIG. 6 is a block diagram illustrating an overall configuration of a driving support display device in a second embodiment. It is a figure explaining the structure of a polarizing plate. It is a figure which shows the state which installed the polarizing plate inside the rear window.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing the overall configuration of the driving assistance display device according to Embodiment 1 of the present invention. The driving support display device includes a camera 1, an obstacle detection sensor 2, a shift position detection unit 3, a control unit 4, a RAM (calculation area) 5, a display unit (head-up display) 6, and a warning sound generation unit 7. In addition, although illustration was abbreviate | omitted, operation input parts, such as the operation key and operation button which receive operation from a driver | operator, are also provided.

The camera 1 acquires video information behind the vehicle.
The obstacle detection sensor 2 is a sensor that detects an obstacle behind the vehicle and acquires obstacle information (distance from the obstacle).
The shift position detection unit 3 detects the position of the shift lever of the vehicle. The display on the rear window 60 (see FIG. 2) in this driving support display device indicates that the shift is “R” (reverse, reverse). Only done at times.

The control unit 4 includes video information acquired by the camera 1, obstacle information acquired by the obstacle detection sensor 2 (distance from the obstacle), the position of the shift lever detected by the shift position detection unit 3, and the like. Is calculated based on the input data and preset data such as vehicle width information, and the contents to be displayed on the display unit 6 to be described later and the warning sound output from the warning sound generating unit 7 are controlled. .
A RAM (calculation area) 5 is an area for storing temporary calculation data in the control unit 4.

The display unit (head-up display) 6 displays camera images, obstacle information, vehicle width information, and the like according to instructions from the control unit 4.
The warning sound generation unit 7 generates a warning sound when the distance between the vehicle and the obstacle approaches within a predetermined distance according to an instruction from the control unit 4.

FIG. 2 is a schematic diagram showing an arrangement relationship of components of the driving assistance display device in the first embodiment.
The camera 1 and the obstacle detection sensor 2 are arranged behind the vehicle, and information detected by them and information from the shift position detection unit 3 that detects the position of the shift lever are input to the control unit 4. The Then, as will be described later, the control unit 4 superimposes a vehicle width guide line or the like on a camera image obtained by photographing the scenery behind the vehicle or the rear of the vehicle, and displays an image on the display unit (head-up display) 6 of the rear window 60. Project.

  FIG. 3 is a display example showing a first display state on the rear window, which is a display example in which the vehicle width guide line 11 of the vehicle is superimposed on the scenery behind the vehicle viewed from the rear window. 3A is a display example when there is no handle operation, and FIG. 3B is a display example when there is a handle operation.

At this time, the vehicle width information, the position / angle of the rear window, and the distance from the driver's seat to the rear window are different for each vehicle. Draw a vehicle width guide line.
Further, when there is a steering wheel operation (in the case of FIG. 3B), the vehicle width guide line 11 may be drawn by the amount of rotation of the steering wheel.

  FIG. 4 is a display example showing the second display state on the rear window. Unlike the first display state shown in FIG. 3, a camera image obtained by photographing the rear of the vehicle with the camera 1 is displayed on the rear window. In this example, at least the vehicle width guide line 11 is superimposed and displayed. FIG. 4A shows a display example in which the vehicle width guide line 11 and the stop guide line 12 are superimposed on a camera image obtained by photographing the rear of the vehicle, and FIGS. 4B and 4C show FIG. ) Is a display example in which the distance from the obstacle behind the vehicle is also displayed.

  Here, FIG. 4B and FIG. 4C are display examples in which the distance from the obstacle behind the vehicle is indicated by a numerical display 13 and a bar display 14. In addition, as shown in FIG. 4C, when the distance from the obstacle behind the vehicle is equal to or less than a predetermined distance, the bar display 14 indicating the distance from the obstacle is changed in color and highlighted. Alternatively, the warning display icon 15 may be displayed together. In addition, when the distance to the obstacle behind the vehicle is equal to or less than a predetermined distance, a warning sound is generated from the warning sound generation unit 7 so that the driver is more appropriately alerted. Can do.

  FIG. 5 is a display example showing the third display state on the rear window. In addition to the second display state shown in FIG. 4, specific information such as white lines, road stones, and obstacles is highlighted. It is a display example. In this figure, the example highlighted by darkening the color of a white line, a road stone, and an obstacle is shown, and the code | symbol 16 in a figure is the location highlighted. In addition, what is necessary is just to use the image processing from a camera for the detection of a white line or a road stone. For example, white information (acquires color information for each pixel and selects a location close to white) and a linear shape (edge processing (emphasizes a location where the color difference between surrounding pixels is large)) and whether they are linear For example, the detection may be performed based on the above-described technology, and a description thereof is omitted here.

  And the control part 4 is shown in the 1st display state which made the vehicle width standard line superimposed on the scenery behind the vehicle visually recognized from a rear window as shown in FIG. 3, and FIG. 4 or FIG. Switching means capable of switching between the second and third display states in which at least the vehicle width guide line is superimposed and displayed on the rear window after the camera image obtained by photographing the rear of the vehicle with the camera is displayed. . This switching means may be a manual switching means that can be arbitrarily switched by an operation button or the like, or an automatic switching means that is switched according to the distance from the obstacle behind the vehicle acquired by the obstacle detection sensor 2. May be. Note that the three display states may be switched between the first display state as shown in FIG. 3, the second display state as shown in FIG. 4, and the third display state as shown in FIG.

In this way, the first display state (the superimposed display of the rear landscape and the vehicle width guide line) and the second display state (the superimposed display of the rear camera image and the vehicle width guide line) can be switched. Thus, when it is desired to confirm the rear of the vehicle over a wide range, or when it is desired to confirm the vicinity of the rear of the vehicle in a parking lot or the like, appropriate driving support can be performed according to each scene.
In addition, in the case of using the manual switching means, there is a degree of freedom that the user can arbitrarily switch, and in the case of using the automatic switching means, it is appropriate depending on the distance from the obstacle etc. There is a merit of displaying.

  Further, instead of the first display state and the second display state, it is possible to switch between the first display state and the third display state (white lines, obstacles, etc. are further highlighted in the second display state) When the driver should pay attention to white lines, road stones, obstacles, etc., such as when approaching more than a predetermined distance to obstacles, etc. by enabling switching between the first to third display states, Driving assistance can be performed by displaying them easily.

  FIG. 6 shows a first display state (superimposed display of a rear landscape and a vehicle width guide line), a second display state (superimposed display of a rear camera image and a vehicle width guide line, etc.) and a third display. It is a flowchart which shows the automatic switching method which switches automatically three states of a state (a white line, an obstruction, etc. are further highlighted in a 2nd display state).

  First, it is determined from the detection result of the shift position detector 3 whether or not the position of the shift lever of the vehicle is “R” (step ST1). If the shift position is not “R” (NO in step ST1), the process ends. On the other hand, when the shift position is “R” (YES in step ST1), a predetermined distance (threshold value) in which the distance from the obstacle behind the vehicle is set in advance from the sensor information of the obstacle detection sensor 2. It is determined whether or not the following is true (step ST2).

  Here, when the distance to the obstacle is larger than a predetermined distance (threshold) (in the case of NO in step ST2), a first display state in which the vehicle width guide line is superimposed on the scenery behind the vehicle ( 3) is displayed on the rear window (step ST3). On the other hand, if the distance from the obstacle is equal to or less than the predetermined distance (threshold) (YES in step ST2), it is further determined whether or not highlighting of white lines, obstacles, etc. is set ( Step ST4).

  If the highlighting of the white line / obstacle is not set (NO in step ST4), the second display in which the vehicle width guide line, the stop guide line, etc. are superimposed on the rear camera image. The state (see FIG. 4) is displayed on the rear window (step ST5). On the other hand, when highlighting of white lines / obstacles is set (in the case of YES in step ST4), the vehicle width guide line, the stop guide line, etc. are superimposed on the rear camera image, and further A third display state (see FIG. 5) in which white lines, road stones, obstacles and the like are highlighted is displayed on the rear window (step ST6).

Note that the setting of highlighting of white lines and obstacles may be set in advance, or may be arbitrarily set by the user.
In addition, the predetermined distance (threshold value) for determining the distance from the obstacle in step ST2 may be set in advance, or can be arbitrarily set by the user, for example, 1 m, 2 m, A candidate such as 5 m may be set and selected from the candidates.

  As described above, according to the driving support display device in the first embodiment, the rear of the vehicle can be confirmed on the rear window, and the rear of the vehicle is confirmed in a wide range without approaching an obstacle or the like. In such a case, the vehicle width guide line is superimposed on the scenery seen from the rear window, and if the distance from the obstacle is less than the predetermined distance, the vehicle width guide line etc. Since the display is superimposed and the display can be switched, more appropriate driving assistance can be provided to the driver.

Embodiment 2. FIG.
FIG. 7 is a block diagram showing the overall configuration of the driving assistance display device according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the structure similar to what was demonstrated in Embodiment 1, and the overlapping description is abbreviate | omitted. The second embodiment shown below further includes a transmittance adjustment mechanism 8 (8a, 8b) as compared with the configuration of the first embodiment shown in FIG. 1, and improves the visibility of the display on the rear window. It is something to be made.

The transmittance adjusting mechanism 8 displays a camera image in the rear window in the second display state as shown in FIG. 4 or the third front state as shown in FIG. 5, that is, the rear of the vehicle. In this case, the camera image overlaps with the scenery behind the vehicle, so that the visibility is considered to be poor.
Various configurations are conceivable as the transmittance adjusting mechanism 8. Here, a case where a blind (not shown) is used and a case where a polarizing plate is used (see FIGS. 8 and 9 described later) are examples. Will be described.

  First, a case where a blind-shaped one is used will be described. This is because a blind-shaped transmittance adjusting mechanism 8a made of a screen material or a color film is installed inside the rear window, and the control unit 4 adjusts the blind-shaped transmittance according to the display state on the rear window. The opening and closing of the mechanism 8a is controlled.

  Specifically, in the first display state as shown in FIG. 3 (superimposed display of the scenery behind the vehicle and the vehicle width reference line), the blind transmittance adjustment mechanism 8a is opened to In the case of the second and third display states (superimposed display of the camera image behind the vehicle and the vehicle width guide line, etc.) as shown in FIGS. 4 and 5 so that the scenery can be seen through. Then, the blind transmittance adjusting mechanism 8a is closed to lower the transmittance of the scenery behind the vehicle or to prevent the scenery from being transmitted.

Thus, by providing the transmittance adjusting mechanism 8a and controlling the transmittance, it is possible to ensure the visibility when displaying the camera video.
The blind-shaped transmittance adjusting mechanism 8a may be opened and closed manually by the user.

Next, a case where a polarizing plate is used will be described. First, the mechanism of the polarizing plate will be described with reference to FIG.
Since the polarizing plate has a property of allowing only light vibrating in a specific direction to pass therethrough, the light transmittance can be adjusted by the installation angle of the two polarizing materials. As shown in FIG. 8A, when the angles of the axes of the two polarizing plates are the same (when the difference between the angles of the axes is 0 degree), the light is transmitted, and as shown in FIG. When the difference between the angles of the two polarizing plates is 90 degrees, no light is transmitted.

By applying this mechanism, a transmittance adjusting mechanism 8b made of a polarizing plate 80 made of the same material as the rear window is installed inside the rear window. FIG. 9 is a diagram showing an axial relationship when the polarizing plate 80 is installed inside the rear window 60.
FIG. 9A is a diagram illustrating a case where the polarizing plate 80 is installed with the direction of the axis of the rear window 60 and the direction of the axis of the polarizing plate 80 being parallel to each other. In this case, since the mechanism is the same as that shown in FIG. 8A, light can be transmitted and the scenery behind the vehicle can be transmitted. On the other hand, FIG. 9B is a diagram showing a case where the axis of the polarizing plate 80 is installed so that the direction of the axis of the polarizing plate 80 is orthogonal (vertical) to the direction of the axis of the rear window 60. In this case, since the mechanism is the same as that shown in FIG. 8B, light is not transmitted and the landscape behind the vehicle is not transmitted.

  In this transmittance adjusting mechanism 8b, it is assumed that the polarizing plate 80 has a disk shape that rotates about the rotation center 90, and a lower portion of the polarizing plate 80 that does not overlap the rear window 60 is housed on the vehicle side. A gap may be provided, or the polarizing plate 80 is a flexible material. Therefore, a portion that does not overlap the rear window 60 may be bent.

And the control part 4 controls rotation of the transmittance | permeability adjustment mechanism 8b which consists of the polarizing plate 80 according to the display state to a rear window.
Specifically, in the first display state as shown in FIG. 3 (superimposed display of the scenery behind the vehicle and the vehicle width reference line), the axis of the polarizing plate 80 is parallel to the axis of the rear window 60. In this way, the scenery behind the vehicle can be seen through, and the second and third display states as shown in FIGS. In the case of (superimposed display), the transmittance of the scenery behind the vehicle is lowered by making the axis of the polarizing plate 80 perpendicular to the axis of the rear window, or control is performed so that the scenery is not transmitted.

Thus, by providing the transmittance adjusting mechanism 8b and controlling the transmittance, it is possible to ensure the visibility when the camera image is displayed. Further, by using the polarizing plate 80, the transmittance can be finely adjusted as compared with the blind transmittance adjusting mechanism 8a.
Note that the rotation of the transmittance adjusting mechanism 8b including the polarizing plate 80 may be manually performed by the user.

  As described above, according to the driving support display device in the second embodiment, in addition to the same effects as those in the first embodiment, the camera image is displayed on the rear window (the second display state and the third display state). ), The driver's visibility can be improved.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  DESCRIPTION OF SYMBOLS 1 Camera, 2 Obstacle detection sensor, 3 Shift position detection part, 4 Control part, 5 RAM (calculation area), 6 Display part (head up display), 7 Warning sound generation part, 8, 8a, 8b Transmittance adjustment mechanism , 11 Vehicle width guide line, 12 Stop guide line, 13 Numerical display of distance to obstacle, 14 Bar display of distance to obstacle, 15 Warning display icon, 16 Highlighted location, 60 Rear window, 80 Polarizing plate, 90 Center of rotation.

Claims (3)

A driving support display device for a rear window of a vehicle,
A camera for obtaining video information behind the vehicle;
An obstacle detection sensor for detecting an obstacle behind the vehicle and acquiring a distance from the obstacle;
A shift position detector for detecting the position of the shift lever of the vehicle;
A display unit for displaying at least the video information acquired by the camera on the rear window;
Content to be displayed on the display unit based on the video information acquired by the camera, the obstacle information acquired by the obstacle detection sensor, and the position of the shift lever detected by the shift position detection unit. A control unit for controlling,
When the distance from the obstacle acquired by the obstacle detection sensor is greater than the threshold , the control unit causes the vehicle width reference line of the vehicle to be superimposed and displayed on the scenery behind the vehicle viewed from the rear window. In the first display state , when the distance from the obstacle is equal to or less than a threshold value , at least the vehicle width reference line is displayed on the rear window with a camera image obtained by photographing the rear of the vehicle with the camera. A driving support display device comprising switching means that can be switched so as to be displayed in the second display state in which is superimposed. Further comprising a blind transmittance adjusting mechanism installed inside the rear window;
In the case of the first display state, the control unit opens the blind-shaped transmittance adjustment mechanism so that the scenery behind the vehicle can be seen and viewed. as a state which does not transmit the vehicle rear landscape closed the blind-like transmittance adjustment mechanism in the case, claim 1 Symbol, characterized in that controlling the opening and closing of the blind-like transmittance adjustment mechanism The driving assistance display device described. Further comprising a transmittance adjustment mechanism comprising a polarizing plate made of the same material as the rear window installed inside the rear window;
The control unit sets the axis of the polarizing plate in parallel with the axis of the rear window in the first display state, and sets the axis of the polarizing plate in the second display state. such that the axial and vertical rear window, according to claim 1 Symbol mounting of the driving support display unit and controls the rotation of the transmittance adjusting mechanism consisting of the polarizer.

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