JP6590635B2 - Vehicle display device - Google Patents

Description

  The present invention relates to a vehicle display device that is provided on an instrument panel of a vehicle and displays an image.

  2. Description of the Related Art Conventionally, there has been proposed a vehicle display device in which a transmission screen is provided on the vehicle rear side of a vehicle instrument panel, and a projector (projection means) is housed inside the instrument panel (for example, Patent Document 1). reference). In the vehicle display device described in Patent Document 1, a plane mirror (reflecting member) is housed in an instrument panel, and projects light from the projector toward the vehicle front side, and the light is directed toward the vehicle rear side by the plane mirror. Thus, light is projected onto the screen. In general, in a display device using a screen and a projector, it is necessary to increase the optical path length of the projection light in order to enlarge the display image on the screen. In the vehicle display device described in Patent Document 1, the projection light is emitted by a plane mirror. Reflection increases the optical path length.

JP 2007-326419 A

  However, in the vehicle display device described in Patent Document 1, the screen and the plane mirror are arranged apart from each other, and the space required for installation is large. Since members such as a vehicle reinforcement member, an air conditioner, an ECU, and a wire harness are provided in the instrument panel, it is difficult to secure a large installation space for the vehicle display device. On the other hand, if the space is saved by bringing the screen and the plane mirror closer, the optical path length will be shortened, and both the reduction of the installation space for the display device for vehicles and the enlargement of the display image will be achieved. Was difficult.

  The objective of this invention is providing the display apparatus for vehicles which can enlarge a display image while reducing installation space.

In order to solve the problems and achieve the object, the invention described in claim 1 is a display device for a vehicle that is provided on an instrument panel of a vehicle and displays an image, the display surface of which is the instrument panel. A transmissive screen provided to face the outside of the projector, a projection unit accommodated in the instrument panel, and a projection light that is disposed on the inner side of the instrument so as to face the back of the screen and that is projected by the projection unit. And the projection light travels between the screen and the reflection member and is obliquely incident on the reflection member, and the screen and the reflection member. is arranged such that the distance than in the direction of the dimension along the moving direction of the projection light in the plane direction of the reflective member is narrowed, The reflecting surface of the reflecting member is a concave curved surface whose curvature increases as the distance from the starting point of the projection light traveling between the screen and the reflecting member increases, and the optical axis of the projection light incident on the reflecting member The vehicle display device is characterized in that the direction is inclined by 10 to 20 degrees with respect to an inclination direction connecting both end portions of the reflecting member .

  The invention described in claim 2 is the invention described in claim 1, further comprising at least one auxiliary reflecting portion that reflects the projection light projected by the projection means toward the reflecting member. It is what.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the screen includes a light guide unit that allows light traveling along a display direction from the screen to the passenger, and the like. And a restricting portion that restricts the passage of light traveling along the direction of.

According to the first aspect of the present invention, the space between the screen and the reflecting member is close to the distance in the in-plane direction of the reflecting member so that the space for installing the vehicle display device on the instrument panel is reduced. Can be small. Further, the projection light travels between the screen and the reflection member and is obliquely incident on the reflection member, so that the light reflected on the reflection member on the side close to the starting point of the projection light is reflected on the side away from the reflection member. There is a difference in optical path length between light and light. Accordingly, the projection light reflected by the reflecting member is distorted, and an image stretched in the direction along the traveling direction of the projection light in the in-plane direction of the reflecting member is projected onto the screen. Therefore, the display image on the screen can be enlarged while reducing the installation space. In addition, by increasing the curvature of the reflecting surface of the reflecting member as the distance from the starting point of the projection light increases, it is possible to prevent a portion of the display image on the screen that is far from the starting point of the projection light from being locally enlarged. . That is, the projection light travels (the optical path length becomes longer) and the projection area widens, and the light reflected on the reflection member on the side close to the starting point of the projection light and the light reflected on the far side. And the traveling direction is different, and by setting the curvature of the reflecting surface as described above, it is possible to prevent the light reflected on the side away from the starting point of the display image from spreading too much, and after reflection. It is possible to suppress local enlargement of the image due to the difference in the light traveling direction. In addition, it is preferable that the curvature of a reflective surface is set so that the light reflected in each position may advance substantially parallel.

  According to the second aspect of the present invention, the degree of freedom in the arrangement of the projection means can be improved by providing the auxiliary reflecting portion. That is, the auxiliary reflecting portion is disposed so that the projection light travels between the screen and the reflection member and is obliquely incident on the reflection member, and the projection means is arranged so that the projection light travels toward the auxiliary reflection portion. What is necessary is just to arrange.

According to the third aspect of the present invention, the screen is provided with the light guide portion and the restriction portion, so that the light from the display image on the screen can reach the passenger and the outside light irradiated on the screen. Can be suppressed and the display image can be easily viewed. The screen displays an image toward a passenger on the rear side of the vehicle, and light is allowed to pass by a light guide unit in a direction toward the rear side of the vehicle. The external light emitted from the control unit is easily regulated by the regulation unit.

It is a side view showing the display for vehicles concerning a 1st embodiment of the present invention. It is a side view which shows typically a mode that light advances in the said display apparatus for vehicles. It is a graph which shows the intensity distribution of the light of the projection image by the projection means of the said display apparatus for vehicles, and the light of the display image on a screen. It is a side view which shows the display apparatus for vehicles which concerns on 2nd Embodiment of this invention. It is a side view which shows typically a mode that external light irradiates through a windshield in the said display apparatus for vehicles. It is a side view which shows the display apparatus for vehicles which concerns on the 1st modification of this invention. It is a side view which shows the display apparatus for vehicles which concerns on the 2nd modification of this invention. It is a side view which shows the display apparatus for vehicles which concerns on the 3rd modification of this invention. It is a side view which shows the display apparatus for vehicles which concerns on the 4th modification of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same constituent members as those described in the first embodiment and the constituent members having the same functions are denoted by the same reference numerals as those in the first embodiment and description thereof is omitted.

<First Embodiment>
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a side view showing a vehicle display device 1A according to a first embodiment of the present invention, and FIG. 2 is a side view schematically showing how light travels in the vehicle display device 1A. FIG. 3 is a graph showing the light intensity distribution of the image projected by the projector 3 of the vehicle display device 1 </ b> A and the light of the display image on the screen 2.

  A vehicle display device 1A according to the present embodiment is provided on an instrument panel I of a vehicle to display an image, and includes a transmissive screen 2, a projector 3 as a projection unit, and a mirror as a reflection member. 4. The “front side” and “rear side” in this embodiment are based on the front-rear direction of the vehicle. Moreover, the instrument panel I shall be formed in the box shape which accommodates members, such as a vehicle reinforcement member, an air conditioner, ECU, a wire harness.

  The screen 2 is formed in a sheet shape or a plate shape, and is provided so as to constitute a part of the side surface from the upper side to the rear side in the instrument panel I, and as a whole toward the lower side toward the rear side. Is inclined. The display surface 21 of the screen 2 is directed to the outside of the instrument panel I, and the back surface 22 is directed to the inside of the instrument panel I. Further, the entire screen 2 is slightly curved convexly toward the upper side, and the curvature increases toward the lower side (rear side).

  The projector 3 is housed inside the instrument panel I and projects the projection light L with the direction toward the lower side from the rear side as the traveling direction. The projection light L has a predetermined area (projection area). As the projection light L travels, the projection area widens, and the traveling direction of the light is slightly different between the center and the edge of the projection area. The “progression method of the projection light L” below indicates the direction of the optical axis LA.

  The mirror 4 is formed in a plate shape, is close to the back surface 22 of the screen 2 in the instrument panel I, and is opposed to the screen 2 so as to be substantially parallel to the screen 2. It is provided so as to be reflected toward 2. That is, the mirror 4 is disposed on the lower side of the screen 2 and slightly on the front side. Although the mirror 4 is not flat, the directions connecting the front end and the rear end of the screen 2 and the mirror 4 are substantially parallel to each other, and the screen 2 and the mirror 4 are substantially parallel to each other. It is said. Further, the upper surface of the mirror 4 is a reflective surface 41, and the reflective surface 41 is an aspherical concave curved surface that has a larger curvature (that is, a smaller radius of curvature) toward the rear side. Further, among the in-plane directions of the mirror 4, the direction along the traveling direction of the projection light L between the screen 2 and the mirror 4 (the direction connecting the front end and the rear end) is defined as the inclination direction A. To do.

  Here, a detailed positional relationship among the screen 2, the projector 3, and the mirror 4 will be described. The projection surface 31 of the projector 3 is located between the screen 2 and the mirror 4 in the facing direction of the screen 2 and the mirror 4, and is aligned in the tilt direction A with the intermediate position of the screen 2 and the mirror 4 in the facing direction. Is provided. The tilt direction A is substantially orthogonal to the facing direction of the screen 2 and the mirror 4. Moreover, the space | interval of the back surface 22 of the screen 2 and the reflective surface 41 of the mirror 4 is narrower than the inclination direction A dimension of the mirror 4, and is 10 to 30% of the inclination direction A dimension in this embodiment, for example. .

  By arranging the screen 2, the projector 3, and the mirror 4 as described above, the projection light L proceeds as follows. That is, the projection light L projected by the projector 3 travels between the screen 2 and the mirror 4 along a direction inclined by an angle θ1 from the inclination direction A to the lower side (mirror 4 side). This angle θ1 is set according to the relative position between the mirror 4 and the projector 3 and the dimension A in the tilt direction of the mirror 4, and is, for example, 10 to 20 °.

  The projection light L projected in this way is obliquely incident on the reflection surface 41 of the mirror 4 and reflected, enters the screen 2 from the back surface 22, and is diffused on the display surface 21. A part of the light diffused in this way reaches the occupant's eye point EP, whereby the display image on the screen 2 is visually recognized. In the present embodiment, the steering wheel S is positioned between the eye point EP and the screen 2, but the positional relationship between the steering wheel S and the screen 2 may be set as appropriate.

  Here, the projection light L travels with a spread of the angle θ2, that is, the upper end light L2 corresponding to the upper end of the display area and the lower end light L3 corresponding to the lower end with respect to the optical axis LA have an angle θ2. It is inclined by 1/2. The light reflected at the center of the reflecting surface 41 becomes the center light L1 corresponding to the center of the display image on the screen 2, and the upper end light L2 is reflected at the front side end (upper end) of the reflecting surface 41, and the lower end light L3. Is reflected at the rear end (lower end) of the reflecting surface 41. Further, the light behind (lower side) the optical axis LA becomes the central light L1.

  The central light L1, the upper end light L2, and the lower end light L3 reflected by the reflection surface 41 travel in substantially parallel to each other, and the light therebetween also travels in substantially parallel after reflection by the reflection surface 41. That is, the reflecting surface 41 is formed in an aspherical shape so that light having different traveling directions at the time of incidence travels substantially in parallel after reflection. Since the projection light L travels as described above after being reflected by the mirror 4, the tilt direction A dimension of the display image on the screen 2 becomes approximately the same as the tilt direction A dimension in the reflection range of the mirror 4.

  Next, the light intensity distribution in the image (projected image) projected by the projector 3 and the light intensity distribution in the display area of the display image on the screen 2 will be described. FIG. 3 is a graph showing the light intensity distribution in the front-rear direction of the projection area and the display area, but the distribution is similar in the width direction of the vehicle. In the horizontal axis of the graph of FIG. 3, the left side corresponds to the upper end side of the projection area and the front side of the display area, and the right side corresponds to the lower end side of the projection area and the rear side of the display area. The left vertical axis indicates the light intensity of the projected image, and the right vertical axis indicates the light intensity of the display image.

  As shown by a solid line in FIG. 3, the projector 3 projects an image having a lower intensity as it is closer to the center in the projection area (that is, the intensity of the center light L1 is lower than the intensity of the upper end light L2 and the lower end light L3). . That is, an image whose intensity is modulated in advance by software is projected. When the projection light L travels and the projection area is widened, the intensity of the light tends to decrease at a position (edge) farther from the center, so that as shown by a solid line in FIG. In the display image, the light intensity is substantially constant over the entire display area. On the other hand, as shown by a two-dot chain line in FIG. 3, when an image in which the light intensity is substantially constant in the entire projection area is projected, the light intensity at the end portion of the display image on the screen 2 is the light at the center. It will be lower than the strength.

  According to this embodiment, there are the following effects. That is, since the mirror 4 is disposed close to and opposed to the back surface 22 of the screen 2, the installation space for the vehicle display device 1A on the instrument panel I can be reduced. Further, when the projection light L travels between the screen 2 and the mirror 4 and is obliquely incident on the mirror 4, a difference in optical path length is generated between the upper end light L2 and the lower end light L3, and is reflected by the mirror 4. The projected light L is distorted, and an image stretched in the direction along the tilt direction A is projected onto the screen 2. Therefore, the display image on the screen 2 can be enlarged while reducing the installation space.

  Furthermore, the reflecting surface 41 of the mirror 4 is an aspherical concave curved surface whose curvature increases as it goes rearward, and the center light L1, the upper end light L2, and the lower end light L3 reflected by the reflecting surface 41 are approximately mutually. By proceeding in parallel, it is possible to prevent the rear side portion of the display image on the screen 2 from being enlarged.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a side view showing the vehicle display device 1B according to the second embodiment of the present invention, and FIG. 5 schematically shows a state in which external light is irradiated through the windshield W in the vehicle display device 1B. It is a side view. The vehicle display device 1 </ b> B of the present embodiment includes a screen 2 </ b> B, a projector 3, and a mirror 4.

  The screen 2B is provided with a plurality of black layers 23 as regulating portions. The black layer 23 extends from the display surface 21 to the back surface 22 along the traveling direction of the projection light L reflected by the mirror 4. Therefore, the portion of the screen 2B where the black layer 23 is not provided becomes the light guide 24, and the traveling direction of the projection light L is the display direction (the direction from the screen 2B toward the passenger's eye point). Light traveling along the display direction can pass through the screen 2B. On the other hand, light traveling along directions other than the display direction is absorbed by the black layer 23 and is restricted from passing through the screen 2B.

  Specifically, as shown in FIG. 5, external light LO may be irradiated into the vehicle through the windshield W. Such external light LO travels diagonally downward from the front side to the rear side, or travels downward from the upper side. The external light LO having such a traveling direction is hardly diffused on the display surface 21 of the screen 2 </ b> B by being absorbed by the black layer 23. Further, external light LO traveling obliquely downward from the upper end portion of the windshield W to the front side is also conceivable. However, since the upper end of the windshield W is located on the front side and the upper side from the eye point EP, Such external light LO is not parallel to the display direction from the screen 2 </ b> B toward the eye point EP, but is absorbed by the black layer 23.

  According to this embodiment, there are the following effects. That is, the screen 2B is provided with the black layer 23 and the light guide 24, so that the light from the image displayed on the screen 2B can reach the passenger and the outside light can be absorbed by the black layer 23. It is possible to prevent the display image from being visually recognized.

  The present invention is not limited to the first embodiment and the second embodiment, and includes other configurations that can achieve the object of the present invention. The following modifications and the like are also included in the present invention. It is.

  For example, in the first embodiment, the projection light L projected from the projector 3 is directed directly to the mirror 4, but at least one auxiliary that reflects the projection light L projected by the projector 3 toward the mirror 4. You may further provide the reflection part.

  That is, as shown in FIG. 6 as a first modification, the vehicle display device 1C includes a screen 2C, a projector 3, a mirror 4, and an auxiliary reflecting portion 51 provided on the back surface of the screen 2C. It is good also as a structure. In such a vehicle display device 1 </ b> C, the projector 3 is provided on the front side and the lower side of the auxiliary reflection unit 51, and projects the projection light L toward the auxiliary reflection unit 51. The projection light L is reflected by the auxiliary reflection part 51 and travels along the direction inclined from the inclination direction A to the mirror 4 side between the screen 2C and the mirror 4 with the auxiliary reflection part 51 as a starting point. Reflected by the mirror 4 toward the screen 2C.

  Further, as shown in FIG. 7 as a second modified example, the vehicular display device 1D includes an auxiliary device provided at substantially the same position as the screen 2, the projector 3, the mirror 4, and the projector 3 of the first embodiment. It is good also as a structure which has the reflection part 52. FIG. In such a vehicle display device 1 </ b> D, the projector 3 is provided on the front side and the lower side of the auxiliary reflection unit 52, and projects the projection light L toward the auxiliary reflection unit 52. The projection light L proceeds in the same manner as in the first modification.

  Further, as shown in FIG. 8 as a third modified example, the vehicle display device 1E may include a screen 2, a projector 3, a mirror 4, and two auxiliary reflecting portions 53 and 54. . In such a vehicular display device 1E, the auxiliary reflection portion 53 on one side (projector 3 side) is provided at substantially the same position as the auxiliary reflection portion 52 of the second modification, and the auxiliary reflection portion on the other side (mirror 4 side). The unit 54 is provided at substantially the same position as the projector 3 of the first embodiment. Further, the projector 3 is provided on the rear side and the lower side of the one auxiliary reflection unit 53, and projects the projection light L toward the auxiliary reflection unit 53. The projection light L is reflected by one auxiliary reflecting portion 53 and travels toward the other auxiliary reflecting portion 54, and then proceeds in the same manner as in the second modification.

  As described above, when the auxiliary reflection unit is further provided, the degree of freedom in arranging the projector 3 can be improved.

  Moreover, in the said embodiment, although the reflective surface 41 of the mirror 4 shall be an aspherical concave curved surface, as shown in FIG. 9 as the vehicle display apparatus 1F of a 4th modification, planar reflection is shown. A mirror 4F having a surface 42 may be provided. In such a vehicle display device 1F, since the reflection surface 42 is a flat surface, the lower side of the display image is easily enlarged as described above. That is, the center light L1 is closer to the upper end light L2 after being reflected by the mirror 4F, and the extension line of the center light L1 is positioned above the display center indicating the center of the display image. At this time, it is calculated in advance or experimentally verified how the display image is enlarged by the reflection of the mirror 4, and an image in which the lower side of the projection area is reduced in advance according to the degree of enlargement. What is necessary is just to adjust a display image by projecting with a projector.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1A-1F Vehicle display device 2, 2B, 2C Screen 3 Projector (projection means)
4, 4F mirror (reflective member)
21 Display surface 22 Back surface 23 Black layer (Regulator)
24 Light guide part 41, 42 Reflection surface 51-54 Auxiliary reflection part L Projection light I Instrument panel

Claims (3)

A vehicle display device that is provided on an instrument panel of a vehicle and displays an image,
A transmissive screen provided with a display surface facing the outside of the instrument panel;
Projection means housed in the instrument panel;
A reflective member disposed opposite to the back surface of the screen inside the instrument and reflecting the projection light from the projection means toward the screen,
The projection light travels between the screen and the reflecting member and is obliquely incident on the reflecting member,
The screen and the reflecting member are arranged so that the interval is narrower than the dimension in the direction along the traveling direction of the projection light in the in-plane direction of the reflecting member ,
The reflecting surface of the reflecting member is a concave curved surface whose curvature increases as the distance from the starting point of the projection light traveling between the screen and the reflecting member increases.
The vehicular display device , wherein the direction of the optical axis of the projection light incident on the reflecting member is inclined by 10 to 20 degrees with respect to an inclination direction connecting both end portions of the reflecting member .   The vehicle display device according to claim 1, further comprising at least one auxiliary reflection unit configured to reflect the projection light projected by the projection unit toward the reflection member. The screen is formed with a light guide portion that allows light traveling along a display direction from the screen to the passenger to pass therethrough, and a regulation portion that restricts passage of light traveling along other directions. vehicle display device according to claim 1 or 2, characterized in that there.

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