JP5089512B2 - Vehicle display device - Google Patents

Description

  The present invention belongs to the technical field of vehicle display devices.

Conventionally, a display image from a display is formed on a screen, and the image is reflected on a windshield (front windshield, hereinafter omitted) for display (for example, see Patent Document 1).
JP 2003-127707 A (page 2-3, full view)

However, in the past, the screen is curved to correct display distortion due to the curved surface of the windshield, and as a method of forming the shape, molding or the like can be considered. However, depending on the position and angle of the screen, the screen It was necessary to change the shape, and the cost was increased.
Further, since the display imaged on the screen is reflected and reflected on the transparent portion of the windshield, the brightness of the display device needs to be considerably increased, and power consumption and heat generation are problems.

  The present invention has been made paying attention to the above-mentioned problems, and an object of the present invention is to provide a display device for a vehicle that can suppress display distortion by suppressing cost and can suppress power consumption and heat generation. There is to do.

In order to achieve the above object, according to the present invention, in a vehicle display device that reflects a display in the vicinity of the position of the front windshield and displays a virtual image to a driver, the display is provided on the front windshield. A colored reflection part that performs first reflection and second reflection in a darker color than the display, and a projection unit that projects projection light toward the first reflection position of the colored reflection part; together form an image a real image distorted by reflection by the concave shape curved receiving the projected light from the first reflecting position of the colored reflective portion, reflects the distorted real image a second reflection position of the colored reflective portion And a screen that is displayed as a virtual image to the driver .

  Therefore, in the present invention, the display distortion can be suppressed by reducing the cost, and the power consumption and heat generation can be suppressed.

  Hereinafter, an embodiment for realizing a vehicle display device of the present invention will be described based on Example 1 corresponding to the invention according to claims 1, 2, 3, and 4.

First, the configuration will be described.
FIG. 1 is an explanatory cross-sectional view of the main configuration of the vehicle display device according to the first embodiment.
The vehicle display device according to the first embodiment includes a projector 1, a screen 2, and a black reflection unit 3.
The projector 1 includes a display unit that generates a display image therein, and a light source that applies light so as to pass through the display unit so that the image has brightness, and emits display light. The projector 1 is configured to irradiate display light from the inside of the instrument panel 4 toward the black reflecting portion 3 at the lower center of the windshield 8 in the vehicle front direction.

The screen 2 receives the display light from the projector 1 via the black reflection unit 3, forms an image of the display light, and reflects the image as the display light toward the black reflection unit 3. The screen 2 is disposed inside the instrument panel 4 on the vehicle front side from the projector 1.
The black reflecting portion 3 is provided at the lower center of the windshield 8 and reflects display light. The black reflecting portion 3 will be described later.

Here, the arrangement of the projector 1 and the screen 2 inside the instrument panel 4 will be described.
As shown in FIG. 1, the instrument panel 4 is a hood of the meter 7 on the vehicle rear side, and the upper surface extends from there to the vicinity of the lower end of the windshield 8 in front. Inside, there are a dash upper 6 that is a partition wall with the engine room, a duct 5 for air conditioning, and the like.
In the vehicular display device according to the first embodiment, the projector 1 and the screen 2 only project and reflect on the black reflecting portion 3 at the center lower end of the windshield 8, and therefore occupy a small space on the front side of the vehicle. Therefore, it does not interfere with objects disposed inside the instrument panel 4 such as the dash upper 6 and the duct 5.

Next, the black reflecting portion 3 will be described.
FIG. 2 is an explanatory diagram of a black reflecting portion of the vehicle display device according to the first embodiment. FIG. 3 is an explanatory diagram of a black reflecting portion and a masking portion of the vehicle display device according to the first embodiment.
In Example 1, as shown in FIG. 3, the black reflective part 3 and the masking part 3a are provided in the peripheral part of the windshield 8. As shown in FIG.
The black reflecting portion 3 and the masking portion 3a are provided, for example, as a windshield 8 having a laminated glass of two sheets and a black ceramic coating portion between the laminated glasses.

In addition, on drawings, such as FIG. 2, a black ceramic coating part shall be shown with hatching on description.
Further, as shown in FIG. 3, the black reflecting portion 3 is formed by increasing the height of a part of the masking portion 3 a provided at the peripheral portion of the windshield 8.
The black reflecting portion 3 is provided at the center of the left and right sides of the passenger compartment from the driver side so that vignetting that is partially invisible by the portion of the instrument panel 4 that becomes the meter hood and the steering 9 does not occur.

Then, the portion of the instrument panel 4 corresponding to the portion where the black reflective portion 3 is provided is recessed downward, and the horizontally long, substantially hexagonal black reflective portion 3 shown in FIG. 2 is provided. This is defined as a recess 4 a of the instrument panel 4.
At this time, the upper surface portion of the instrument panel 4 other than the concave portion 4a, that is, the general surface is set as high as possible, and the concave portion 4a is formed so that only the portion for performing reflective display is recessed.

Next, the structure regarding the reflection of the display light of the display apparatus for vehicles of Example 1 is demonstrated.
In FIG. 1, the projector 1 irradiates display light to the reflection position 201 on the lower side of the black reflector 3 through the optical path 100. The black reflection unit 3 reflects the optical path 100 at the reflection position 201 and directs the display light to the screen 2 through the optical path 101.
The screen 2 forms an image of the display light on the optical path 101 at one end and reflects it as display light, and directs the display light to the reflection position 202 of the black reflector 3 by the optical path 102.
The black reflecting unit 3 reflects the optical path 102 at the reflection position 202 and directs the display light to the eye point E of the driver through the optical path 103.
Thus, in Example 1, it is the structure which reflects twice in the black reflective part 3. FIG.

The operation will be described.
[Inhibition of display distortion]
FIG. 4 is an optical layout diagram illustrating a virtual image display state of the vehicle display device according to the first embodiment. FIG. 5 is an explanatory diagram of display image distortion of the vehicle display device according to the first embodiment. FIG. 6 is an explanatory diagram of display image distortion in a concave mirror and a virtual image. FIG. 7 is an explanatory diagram of display distortion in the concave mirror and the real image.
In the vehicular display device according to the first embodiment, first, the display light is irradiated from the projector 1 to the black reflecting portion 3 through the optical path 100.
The display image of the projector 1 is a rectangular display image 11 (see FIG. 5C).
In the black reflection unit 3, the display light is reflected at the reflection position 201, and the display light is directed to the screen 2 through the optical path 102.
Then, the display light is imaged on the screen 2, and a display image 21 is generated (see FIG. 5B).

Here, attention is focused on the optical path 101 from the black reflecting portion 3 to the screen 2 shown in FIG. Then, as shown in FIG. 5B, the upper side c1 and the lower side d1 are set to the display image 21 formed on the screen 2. 4 can be divided into an optical path 101a that forms both ends of the upper side c1 of the display image 21 and an optical path 101b that forms both ends of the lower side d1 of the display image 21. it can.
Considering this, the reflection from the black reflecting portion 3 to the screen 2 and the image formation on the screen 2 are concave on the vehicle interior side because the black reflecting portion 3 is provided on the surface of the windshield 8. The relationship between the concave mirror and the real image is obtained.

The relationship between the concave mirror and the real image will be described with reference to FIG. 7. When the optical path 101a is longer than the optical path 101b, the real image length c1 of the optical path 101a is shown in FIGS. The real image length d1 'of the optical path 101b is longer than'.
Therefore, the display image 21 of the real image reflected by the black reflecting portion 3 and formed on the screen 2 has a display distortion that causes the lower side d1 to be longer than the upper side c1 because the optical path 101a is longer than the optical path 101b. It becomes an image 21.

Next, attention is focused on the optical path 102 from the screen 2 to the black reflecting portion 3 shown in FIG. Then, as shown in FIG. 5A, the upper side a1 and the lower side b1 are set to the display image 20 displayed as a virtual image. Then, the optical path 102 from the screen 2 in FIG. 4 to the reflection position 202 of the black reflecting portion 3 is divided into an optical path 102a that forms both ends of the upper side a1 of the display image 20 and an optical path 102b that forms the lower side b1 of the display image 20. be able to.
Considering this, the virtual image display by the reflection from the screen 2 to the black reflecting portion 3 and the reflection from the black reflecting portion 3 to the driver's eye point E is because the black reflecting portion 3 is provided on the surface of the windshield 8. Since it has a concave shape on the vehicle interior side, it has a relationship between a concave mirror and a virtual image.

The relationship between the concave mirror and the virtual image will be described with reference to FIG. 6. When the optical path 102a is longer than the optical path 102b, as shown in FIGS. 6 (a) and 6 (b), the length a1 of the virtual image along the optical path 102a. 'Becomes longer than the length b1' of the virtual image by the optical path 102b.
For this reason, the display light 20 reflected by the black reflector 3 by displaying the display light from the screen 2 tries to cause display distortion so that the upper side a1 is longer than the lower side b1 because the optical path 102a is longer than the optical path 102b. To do.

However, the display image sent through the optical path 102 is the display image 21, and the lower side is distorted longer than the upper side. Therefore, the display image 20 displayed as a virtual image is a display image in which the difference between the lengths of the upper side and the lower side, that is, display distortion is suppressed.
As described above, in the first embodiment, the cost is reduced by the two-time reflection at the black reflecting portion 3, and the virtual image display in which the display distortion is suppressed is performed without adding a configuration for special display distortion.

  Furthermore, since the virtual image display of the first embodiment is provided by enlarging a part of the masking portion 3a provided as the peripheral portion of the windshield 8, the cost is further suppressed. And since it becomes a black reflective surface, since a strong contrast can be obtained with respect to the display image 20 of a virtual image, display brightness | luminance can be suppressed and the problem of power consumption or heat_generation | fever does not arise.

In order to clarify the operation of the first embodiment, further explanation will be added below.
FIG. 8 is an explanatory cross-sectional view of the main configuration of the vehicle display device. FIG. 9 is an optical layout diagram showing a virtual image display state in the configuration of FIG. FIG. 10 is an explanatory diagram of display image distortion in the configuration of FIG.
In order to perform virtual image display in the vehicle, it is conceivable to perform virtual image display by reflecting display light from the display 51 as shown in FIG.
At that time, the display 51 displays the rectangular display image 11.
Then, the optical path 301 can be composed of an optical path 301 a at both ends of the upper side of the display image 11 and an optical path 301 b at both ends of the lower side of the display image 11.

Here, since the windshield 8 has a concave shape on the vehicle interior side, the relationship between the concave mirror described in FIG. 6 and the virtual image is obtained. As shown in FIG. 9, since the optical path 301a is longer than the optical path 301b, the upper side a1 of the display image 22 displayed as a virtual image is longer than the lower side b1 as shown in FIG. 10 (a). Distorted.
For this reason, in order to correct this display distortion, for example, when the screen is curved, it is necessary to change the screen shape depending on the position, angle, etc., which increases the cost. However, in a vehicle, since the position and angle of the screen are determined from the design and the comfort in the vehicle interior, for example, it is difficult to deploy to other vehicle types.

  On the other hand, in the vehicle display device according to the first embodiment, the display image of the projector 1 is reflected by the first reflecting surface (reflection position 201) of the black reflecting portion 3 of the windshield 8 and formed on the screen 2. In the real image (display image 21), the longer the distance to the reflection surface, the smaller the image (upper side c1), and the shorter the distance, the longer the image (lower side d1).

When the driver sees the real image (display image 21) formed on the screen 2, the real image (display image 21) is reflected by the second reflecting surface (reflection position 202) to see the virtual image. Here, the longer the distance from the screen 2 to the black reflecting portion 3, the larger the virtual image (upper side a1), and the shorter the distance, the smaller the virtual image (lower side b1).
As a whole of the display, the display distortion caused by the curved surface of the windshield 8 acts in a direction in which the first reflection and the second reflection cancel each other, and the display distortion is greatly suppressed.

Further, in the configuration of FIG. 8, since the reflection is displayed on the transparent portion of the windshield 8, the luminance of the display device needs to be considerably increased, and power consumption and heat generation become problems.
In this regard, in Example 1, since the black reflective portion 3 that appears black is the background of the virtual image display, the display obtains a strong contrast, the display luminance is reduced, and the problem of power consumption and heat generation does not occur.
Moreover, in Example 1, since the screen 2 is arrange | positioned in the part used as the shadow of the black reflection part 3, external light becomes difficult to enter into the screen 2, and the fall of the display quality (contrast) by external light is prevented.

Next, the effect will be described.
In the vehicle display device according to the first embodiment, the effects listed below can be obtained.

  (1) In a vehicular display device that reflects display light near the position of the windshield 8 and displays a virtual image to the driver, it is provided on the windshield 8 and is a concave curved surface that follows the windshield 8 and is darker than the display. A black reflection unit 3 that performs first reflection (reflection position 201) and second reflection (reflection position 202) by color, and a projector that projects display light toward the first reflection position 201 of the black reflection unit 3 1 and the screen 2 that reflects the display light toward the second reflection position 202 of the black reflection part 3 while the display light from the first reflection position 201 of the black reflection part 3 is imaged. Display distortion can be suppressed by reducing costs, and power consumption and heat generation can be suppressed.

  (2) In the above (1), since the black reflecting portion 3 is formed by enlarging the colored portion covering the periphery of the windshield 8, the black reflecting portion 3 can be provided with reduced cost. In addition, the display unit can take into account the driver's front view.

(3) In the above (2), the screen 2 is disposed inside the instrument panel 4 in the vicinity of the windshield 8 so that the black reflecting portion 3 blocks the external light that passes through the windshield 8 and travels toward the screen 2. Therefore, it is possible to prevent the display quality from being deteriorated due to external light.
(4) In the above (1) to (3), the first reflection (reflection position 201) of the black reflector 3 is a reflection that forms a real image (display image 21) on the screen 2 by concave reflection of the display light. Since the second reflection of the black reflecting portion 3 is a reflection that displays a virtual image (display image 20) on the vehicle front side by the concave reflection of the display light, the first reflection has a relationship between the concave mirror and the real image. The lower side is made larger than the upper side of the rectangular display of the projector, and in the second reflection, the upper side is made larger than the lower side so that the concave mirror and the virtual image are related, and the first reflection and the second The effect of distorting the display of reflection can be canceled out, so that the display distortion can be suppressed by reducing the cost.

  As mentioned above, although the display apparatus for vehicles of the present invention has been described based on the first embodiment, the specific configuration is not limited to these embodiments, and the invention according to each claim of the claims is described. Design changes and additions are allowed without departing from the gist.

For example, in the first embodiment, the black reflecting portion is a painted portion provided between the two windshields, but may be provided by painting on the vehicle interior side of the windshield, or by adhesion. Good.
Further, for example, in Example 1, the black reflective portion is black. However, as long as it has a sufficient contrast with respect to the display, other colors or patterns may be added.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory cross-sectional view of a main configuration of a vehicle display device according to a first embodiment. It is explanatory drawing of the black reflective part of the display apparatus for vehicles of Example 1. FIG. It is explanatory drawing of the black reflective part and masking part of the display apparatus for vehicles of Example 1. FIG. It is an optical layout figure which shows the virtual image display state of the display apparatus for vehicles of Example 1. FIG. It is explanatory drawing of the display image distortion of the display apparatus for vehicles of Example 1. FIG. It is explanatory drawing of the display image distortion in a concave mirror and a virtual image. It is explanatory drawing of the display distortion in a concave mirror and a real image. It is explanatory sectional drawing of the main structures of the display apparatus for vehicles. It is an optical layout figure which shows the virtual image display state in the structure of FIG. It is explanatory drawing of the display image distortion in the structure of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Screen 3 Black reflective part 3a Masking part 4 Instrument panel 4a Recess 5 Duct 6 Dash upper 7 Meter 8 Windshield 9 Steering 11 Display image 20-22 Display image 51 Display 100 (From projector to black reflection part) Optical path 101 optical path 101a (from black reflector to screen) optical path 101b optical path 102 optical path (from screen to black reflector) 102a optical path 102b optical path 103 optical path 201 (from black reflector to driver eye point) (of black reflector) (First) reflection position 202 (second reflection position of black reflection part) 301 light path 301a (from display to windshield) light path 301b light path
a1 (upper side of display image 20)
b1 Bottom of display image 20
c1 Upper side of display image 21
d1 Lower side E (of the display image 21) Eye point (of the driver)

Claims (4)

In the vehicle display device that reflects the display near the position of the front windshield and displays a virtual image to the driver,
A colored reflecting portion provided on the front windshield, having a concave curved surface following the front windshield, and performing a first reflection and a second reflection in a darker color than the display;
Projection means for projecting projection light toward the first reflection position of the colored reflection portion;
Together form an image a real image distorted by reflection by the concave shape curved receiving the projected light from the first reflecting position of the colored reflective portion, reflects the distorted real image a second reflection position of the colored reflective portion Let the driver show it as a virtual image ,
With
A display device for a vehicle. The vehicle display device according to claim 1,
The colored reflection portion is formed by enlarging a colored portion covering the periphery of the front windshield,
A display device for a vehicle. The vehicle display device according to claim 2,
The screen is arranged inside the instrument panel in the vicinity of the front windshield so that the colored reflection portion blocks outside light passing through the front windshield and going to the screen.
A display device for a vehicle. In the vehicle display device according to any one of claims 1 to 3,
The first reflection of the colored reflection portion is a reflection that forms a real image on the screen by concave reflection of display light,
The second reflection of the colored reflection portion is a reflection that displays a virtual image on the vehicle front side by concave reflection of display light.
A display device for a vehicle.

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