JP5817792B2 - Projection type display device for vehicle - Google Patents

Description

  The present invention relates to a projection display device for a vehicle that displays an image by projecting light in a vehicle interior.

  Japanese Patent Application Laid-Open Publication No. 2004-228688 discloses a projection display device for a vehicle that displays an image by projecting image light onto an image display surface provided in a vehicle interior. Specifically, the projection display device of Patent Document 1 displays an image using the surface of the front pillar as an image display surface in the vehicle interior of the vehicle.

Japanese Patent No. 4280648

  In Patent Document 1 described above, the video display surface is the surface of the front pillar, and the surface has a three-dimensional shape. Therefore, if the characteristic of reflecting light does not change at any part of the three-dimensional video display surface, the brightness of the video for the driver who watches the video will have spots corresponding to the normal direction of the video display surface. Arise. And when a driver | operator visually recognizes the image with a spot in brightness, there existed a possibility that a driver | operator's comfort might be impaired.

  The present invention has been made in view of the above points, and an object thereof is to provide a projection display device for a vehicle that can suppress unevenness in the brightness of an image for a driver.

In order to achieve the above object, in the vehicle projection type display device according to the first aspect of the present invention, a video projection device (18) that projects video light (RYpj),
The first area (121a) which has different normal directions and performs retroreflection and diffuse reflection of image light and the second area (121b) which performs retroreflection and diffuse reflection of the image light, 11R) and a video display surface (121) formed on the cabin side of the front pillar (12) on the side, on which video is displayed by reflection of video light in the first region and the second region,
The normal (LVa) of the first region is facing the driver's seat rather than the normal (LVb) of the second region,
In the first region, the ratio of the retroreflective component in the reflected light of the image light is larger than that of the second region, while the proportion of the diffuse reflection component is smaller than that of the second region,
The video projection device is characterized in that the retroreflective component of the reflected light of the video light reflected by the first region and the second region is arranged to go to a place other than the driver's seat.

  Here, in the first area of the video display surface, the normal line is directed toward the driver's seat compared to the second area, so the first area is seated in the driver's seat rather than the second area. It is composed of a surface close to the surface facing the driver. Therefore, for example, if both the first region and the second region are only diffusely reflected without any retroreflection, the image on the first region looks brighter to the driver.

  On the other hand, according to the above-described invention, the video projection device is arranged such that the retroreflective component of the reflected light of the video light reflected by the first region and the second region is directed to a place other than the driver's seat. Therefore, the driver sees not the retroreflective component but the diffuse reflection component exclusively in the reflected light. In the first area, the ratio of the retroreflective component in the reflected light of the image light is larger than that in the second area, while the ratio of the diffuse reflection component is smaller than that in the second area. , The difference between the first region and the second region is reduced. Therefore, it is possible to suppress unevenness in the brightness of the image for the driver between the first region and the second region.

  In addition, each code | symbol in the parenthesis described in this column and the claim respond | corresponds to each code | symbol described in embodiment mentioned later.

FIG. 1 is a diagram illustrating a schematic configuration of a projection display device 10 according to an embodiment of the present invention and a state in which the front of a vehicle is viewed from a passenger compartment. It is sectional drawing which showed the structure of the thickness direction of the A pillar surface 121 of FIG. FIG. 2 is a diagram schematically illustrating a positional relationship among a driver 40 who is a viewer viewing an image on an A-pillar surface 121, an image projection device 18, and an A-pillar surface 121 in the vehicle interior of FIG. It is the 1st figure showing the modification of Drawing 1, and is a figure equivalent to Drawing 1. It is the 2nd figure which showed the modification of FIG. 1, Comprising: It is a figure equivalent to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each embodiment including other embodiment mentioned later, the same code | symbol is attached | subjected to the part which is mutually the same or equivalent.

  FIG. 1 is a diagram showing a schematic configuration of a projection display device 10 according to the present invention and a state in which the front of the vehicle is viewed from the passenger compartment. The projection display device 10 is a display device for a vehicle, for example, and is used for applying an optical camouflage to a vehicle interior. For example, the projection display device 10 is hidden from the driver 40 by the A pillar 12 in order to optically erase the blind spot caused by the A pillar 12 on the driver's seat 11R side with respect to the driver 40 (see FIG. 3). The image composed of the scenery outside the vehicle is displayed on the surface 121 of the A pillar 12 on the passenger compartment side, that is, the A pillar surface 121. The A pillar surface 121 corresponds to the image display surface in the present invention. The driver 40 is an occupant seated in the driver's seat 11 </ b> R and a viewer who sees an image reflected on the A-pillar surface 121. The driver's seat 11R includes, for example, a seat surface portion that constitutes a seat surface on which the driver 40 is seated, a backrest portion that supports the driver's 40 back, and a headrest that suppresses the back tilt of the driver's 40 head. It consists of a part.

  As shown in FIG. 1, the projection display device 10 includes an outside shooting camera 16 for shooting a scenery outside the vehicle that is invisible to the driver 40 (see FIG. 3) by the A pillar 12, and the A pillar surface. 121 includes a video projection device 18 serving as a projector that projects video light RYpj (see FIG. 3) to 121, and a processing device 20 that is an electronic control device installed at a location that cannot be seen by a passenger.

  The outside camera 16 is a CCD camera, for example. The outside-camera shooting camera 16 is disposed so as to photograph the outside of the A-pillar 12 from a direction substantially the same as the line of sight of the driver 40 seated in the driver's seat 11R. For example, the outside camera 16 is attached to the outside of the vehicle in the vicinity of the front pillar, that is, the A pillar 12.

  The image projection device 18 is a laser projector that emits laser light and displays an image. The video projection device 18 is installed, for example, in the center front of the vehicle interior ceiling 22 so that the emission direction of the laser beam is directed toward the A pillar 12.

  Specifically, the image projection device 18 projects laser light as image light RYpj (see FIG. 3) in order to display an image captured by the camera 16 for shooting outside the vehicle on the A-pillar surface 121. More specifically, a blind spot image composed of a scenery outside the vehicle that is a blind spot by the A pillar 12 for the driver 40 seated in the driver's seat 11R is sequentially captured by the outside camera 16. Then, the video projection device 18 sequentially displays the blind spot video on the A pillar surface 121 by projecting the video light RYpj.

  The A pillar 12 is disposed between the driver seat door 24 and the windshield 26 on the driver seat 11R side. The A pillar surface 121 formed on the passenger compartment side of the A pillar 12 is an image display surface on which an image is displayed by reflection of the image light RYpj (see FIG. 3). With both the characteristics to be.

  Such light reflection characteristics of the A-pillar surface 121 are, for example, configured by a diffuse reflection surface 122 that diffusely reflects the A-pillar surface 121 first, as shown in FIG. 2 showing the configuration of the A-pillar surface 121 in the thickness direction. In addition, the retroreflective member 123 that retroreflects by including glass beads or the like on the diffuse reflection surface 122 is thinly applied in a film shape. And the ratio of the retroreflection component which occupies for reflected light increases, and the ratio of a diffuse reflection component decreases, so that the application quantity per unit area of a retroreflection material is increased.

  The A pillar surface 121 will be described with reference to FIGS. 1 and 3. FIG. 3 is a diagram schematically showing the positional relationship among the driver 40, the video projection device 18, and the A pillar surface 121. As shown in FIG.

  As shown in FIGS. 1 and 3, the A-pillar surface 121 has a first area 121a on the driver's seat door 24 side and a second area 121b on the windshield 26 side. The normal LVa direction that is the axial direction of the normal LVa of the first region 121a is different from the normal LVb direction that is the axial direction of the normal LVb of the second region 121b.

  Specifically, the normal line LVa of the first area 121a faces the driver's seat 11R (see FIG. 1) rather than the normal line LVb of the second area 121b. The relationship between the first region 121a and the second region 121b is the same regardless of which part in each region is compared between the first region 121a and the second region 121b. And the relationship between the 1st field 121a and the 2nd field 121b is materialized even if the position of driver's seat 11R is adjusted to any position within the adjustment range. In short, any part in the first region 121a is configured with a surface close to a surface facing the driver 40 seated in the driver's seat 11R, as compared with the second region 121b. Note that each of the first region 121a and the second region 121b is a part of the A pillar surface 121 formed by one curved surface. However, in FIG. 3, the first region 121a and the second region 121b The two regions 121b are represented by planes in different directions.

  Moreover, in the 1st area | region 121a of the A pillar surface 121, the quantity per unit area of the retroreflection material 123 is larger than the 2nd area | region 121b. Accordingly, the first region 121a is configured such that the ratio of the retroreflective component in the reflected light of the image light RYpj is larger than that of the second region 121b and the proportion of the diffuse reflection component is smaller than that of the second region 121b. Has been.

  As shown in FIG. 3, the video projection device 18 is arranged so that the video light RYpj can be projected uniformly over the entire A-pillar surface 121 displaying the video. For example, the video projection device 18 is arranged such that the retroreflective component of the reflected light of the video light reflected by the first region 121a and the second region 121b is directed to a place other than the driver's seat 11R. In FIG. 1, the video projection device 18 is installed in front of the center of the passenger compartment ceiling 22, so that the retroreflective component goes to the front of the center of the passenger compartment ceiling 22. In short, the retroreflective component of the reflected light travels along the optical axis CLry of the image projection device 18 from the first region 121a and the second region 121b, and thus deviates from the driver's seat 11R without going to the driver's seat 11R. Head to the place. This is true regardless of the position of the driver's seat 11R within the adjustment range. As a result, the retroreflective component of the reflected light does not reach the eyes of the driver 40 seated in the driver's seat 11R. In FIG. 3, the retroreflective component of the reflected light is represented by a broken line arrow RRYpj.

  Returning to FIG. 1, the processing device 20 is an electronic control device composed of a well-known microcomputer comprising a CPU, ROM, RAM, etc. and its peripheral circuits. The processing device 20 executes various control processes according to a computer program stored in advance in a ROM or the like.

  Further, as shown in FIG. 1, for example, a video signal representing shooting information captured by the outside camera 16 is sequentially input to the processing device 20. Further, from the processing device 20, for example, a video control signal for controlling the video light RYpj projected by the video projection device 18 is sequentially output to the video projection device 18.

  The processing device 20 sequentially inputs and outputs such signals, thereby projecting the image light RYpj to the A pillar 12 and displaying the image on the A pillar surface 121.

  In this embodiment, since the normal line LVa faces the driver's seat 11R in the first region 121a of the A pillar surface 121 as compared to the second region 121b, the first region 121a is in the second region 121b. Rather, it is composed of a surface close to the surface directly facing the driver 40 seated in the driver's seat 11R. Therefore, for example, if both the first region 121a and the second region 121b are only diffusely reflected without retroreflection, the image on the first region 121a is more suitable for the driver 40. Looks bright.

  On the other hand, according to the present embodiment, the video projection device 18 has a retroreflective component of the reflected light of the video light reflected by the first region 121a and the second region 121b going to a place other than the driver's seat 11R. Thus, the driver 40 visually recognizes not the retroreflective component but the diffuse reflection component exclusively in the reflected light. In the first area 121a, the ratio of the retroreflective component in the reflected light of the image light is larger than that in the second area 121b, while the ratio of the diffuse reflection component is smaller than that in the second area 121b. In the image brightness, the difference between the first area 121a and the second area 121b is reduced. Therefore, unevenness in the brightness of the image for the driver 40 can be suppressed between the first region 121a and the second region 121b.

(Other embodiments)
(1) In the above-described embodiment, the projection display device 10 is used for applying an optical camouflage to the vehicle interior, but the projection display device 10 may be used for purposes other than the optical camouflage. For example, the projection display device 10 displays an image indicating the function or operation method of the operation unit provided in the passenger compartment and operated by the occupant by projecting the image light RYpj around the operation unit or the operation unit. Also good. If the operation unit is, for example, an air conditioner switch, an image showing the operation direction of the air conditioner switch is displayed on the surface of the air conditioner switch.

  Further, if the projection display device 10 is not used for optical camouflage, the outside-camera shooting camera 16 is unnecessary. Furthermore, the projection display device 10 may not be used for vehicles.

  (2) In the above-described embodiment, one video projection device 18 projects the video light RYpj on the entire A pillar surface 121, that is, the first region 121a and the second region 121b. However, as shown in FIG. The mold display device 10 includes two video projection devices 18. The first video projection device 18 projects video light RYpj on the first region 121a, and the second video projection device 18 projects video light RYpj on the second region 121b. Can be projected. In FIG. 4, for example, the first video projection device 18 is installed in front of the driver's seat 11R side of the passenger compartment ceiling 22, and the second video projection device 18 is installed in the center front of the passenger compartment ceiling 22 as in FIG. Has been.

  As yet another example, as shown in FIG. 5, the projection display device 10 may include a third video projection device 18 in addition to the first and second video projection devices 18. The third video projection device 18 includes, for example, a lower portion 42 of the dashboard, a passenger compartment-side surface 44 of the A-pillar on the passenger seat 11L side, a passenger compartment-side surface 46 of the driver seat 11R-side door, and the passenger seat 11L. The image light RYpj is projected onto any or all of the surface 48 on the passenger compartment side of the side door. Thereby, the 3rd image | video projection apparatus 18 displays the blind spot image comprised from the scenery outside the vehicle which becomes the blind spot with respect to the driver | operator 40 by the site | part on the site | part which projects the image light RYpj.

  (3) In the above-described embodiment, the video projection device 18 is a laser projector that emits laser light, but may be a projector of another type such as a liquid crystal projector.

  (4) In the above-described embodiment, the processing device 20 is a separate device from the video projection device 18, but the video projection device 18 may include the processing device 20.

  (5) In the above-described embodiment, the A pillar surface 121 has the first region 121a and the second region 121b. However, the region where the image is displayed is other than the first region 121a and the second region 121b. You can have it.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably. Further, in the above-described embodiment, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered to be essential in principle. . Further, in the above embodiment, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is particularly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to a specific number except for cases. Further, in the above embodiment, when referring to the material, shape, positional relationship, etc. of the component, etc., unless otherwise specified and in principle limited to a specific material, shape, positional relationship, etc. The material, shape, positional relationship and the like are not limited.

10 Projection Display 11R Driver's Seat 12 A Pillar 121 A Pillar Surface (Video Display Surface)
121a 1st area | region 121b 2nd area | region 18 Image projector

Claims (5)

A video projection device (18) for projecting video light (RYpj);
A driver's seat has a first area (121a) that has different normal directions and performs retroreflection and diffuse reflection of the image light, and a second area (121b) that performs retroreflection and diffuse reflection of the image light. An image display surface (121) formed on the vehicle interior side of the front pillar (12) on the (11R) side, on which an image is displayed by reflection of the image light in the first region and the second region,
The normal line (LVa) of the first region faces the driver's seat more than the normal line (LVb) of the second region,
In the first region, the ratio of the retroreflective component in the reflected light of the video light is larger than the second region, while the proportion of the diffuse reflection component is smaller than the second region,
The video projection device is arranged such that the retroreflective component of the reflected light of the video light reflected by the first region and the second region is directed to a place other than the driver's seat. Projection type display device for vehicles.   The image projection device projects the blind spot image composed of the scenery outside the vehicle which is a blind spot by the front pillar to the driver (40) seated in the driver's seat by projecting the image light. The projection display device for a vehicle according to claim 1, wherein the projection display device is displayed on a video display surface.   3. The vehicle according to claim 1, wherein the video projection device is installed in front of a center of a vehicle compartment ceiling (22) so as to project the video light onto the video display surface. Projection display device. The front pillar is disposed between the driver side door (24) on the driver side and the windshield (26),
The said video display surface has the said 1st area | region on the said driver's seat door side, and has the said 2nd area | region on the said windshield side, The one of Claim 1 thru | or 3 characterized by the above-mentioned. The projection display apparatus for vehicles as described. The first region includes a diffuse reflection surface (122) that diffusely reflects, and a retroreflector (123) that is formed in a film shape on the diffuse reflection surface and performs retroreflection.
In the first region, the ratio of the retroreflective component in the reflected light of the image light is larger because the amount of the retroreflective material per unit area is larger than that in the second region. The projection display device for a vehicle according to any one of claims 1 to 4, wherein the projection display device is for a vehicle.

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