JP6614918B2 - In-vehicle display device - Google Patents

Description

  The present invention relates to an in-vehicle display device configured such that a viewer in a vehicle visually observes a virtual image formed forward.

Patent Document 1 describes an invention related to a head-up display device.
In the head-up display device, a first projection lens and a second projection lens are provided in front of the projector, and a first screen and a second screen are further provided in front. The image displayed on the first screen through the first projection lens is reflected by the reflection mirror to become the first virtual image in front of the vehicle, and the image displayed on the second screen through the second projection lens is reflected by the reflection mirror. It becomes a 2nd virtual image ahead of vehicles.

  Since the positions of the first projection lens and the first screen are fixed, the display position of the first virtual image is fixed. On the other hand, the second screen is moved in the optical axis direction by the motor, and the second projection lens is also moved in the optical axis direction following this, so that the display position of the second virtual image is the second in front of the vehicle. Move back and forth in conjunction with screen movement.

  The head-up display device described in Patent Document 1 displays the current vehicle speed or the like of a vehicle by a first virtual image at a fixed position and displays a warning for an interrupting vehicle by a second virtual image when the vehicle travels. In this warning display, a frame surrounding the interrupting vehicle is displayed, the second screen moves back and forth according to the distance between the own vehicle and the interrupting vehicle, and the display position of the frame (second virtual image) that is the warning display is And move back and forth depending on the distance from the interrupting vehicle.

JP2015-11217A

  In the head-up display device described in Patent Document 1, the first virtual image is displayed at a fixed position in front of the vehicle. As described in paragraph “0064”, as the first virtual image, the current vehicle speed, Information signs, map images, traffic information, news, weather forecasts, times, smartphone screens, TV programs, and the like are displayed.

  That is, all the images that should be displayed as images that do not move forward and backward except for the warning display in which the frame surrounding the interrupting vehicle moves are displayed as the first virtual image at a relatively close position in front of the vehicle. .

  If all the information to be displayed as an image that does not move back and forth is displayed as the first virtual image at the same display position, the driver must always point the line of sight toward the first virtual image. May be removed. In particular, the display information such as the current vehicle speed, guide signs, and map images listed above includes a large amount of information, so a wide range of display area is required to display them. It becomes. Therefore, by looking at this display, there is a high possibility that attention to the front during driving will be removed.

  In order to perform display with a large amount of information as described above, as shown in FIGS. 15 and 17 of Patent Document 1, the conventional head-up display device separates the first virtual image from the steering wheel to the left side considerably. It must be displayed at the specified position. For this reason, the driver must always turn his / her line of sight to the left side, which further adversely affects driving.

  Further, in the head-up display device, in order to increase the amount of information to be displayed, a wide range on the left and right in front of the driver's field of view is a first virtual image formation region, and most of the region is a number, symbol or character. The information display area must be used. In this case, it is necessary for the driver to visually recognize a very wide range, and the driver's field of view is easily obstructed.

  Furthermore, in the head-up display device described in Patent Document 1, the range in which the second virtual image is displayed is set as a display area in the same extent as the range of the first virtual image. While viewing the second virtual image located at, the entire image of the first virtual image located below the front window may enter the field of view. For the driver, the visibility is reduced and the amount of information captured during driving This leads to an increase in the safety, which is not preferable in terms of safety.

Also,
When the display range of the first virtual image and the second virtual image is approximately the same, if the driver shifts the driving posture and the head position is shifted in the vertical direction, the driver A phenomenon in which the second virtual image overlaps and becomes visible is also likely to occur.

  The present invention solves the above-described conventional problem, and enables driving information of a vehicle to be displayed both in the center of the visual field range when the viewer looks at the front and in the region off the center. Thus, an object of the present invention is to provide an in-vehicle display device that makes it easy to give information to the driver and can turn the driver's line of sight forward as much as possible.

The present invention includes a transmission screen, an image generation unit that generates an intermediate image on the transmission screen, and a projection unit that projects the intermediate image onto the concave surface of the curved half mirror, and the convex side of the half mirror In the in-vehicle display device in which the viewer can view the virtual image formed in the front from the concave side of the half mirror,
The virtual image is separated into a distant image away from the half mirror and a near image closer to the half mirror.
The far image is displayed at the center of the visual field range when the viewer looks at the front, and the near image is displayed at a position off the center of the visual field range ,
Center in the lateral direction of the proximal image, than the end portions of the right and left direction of the distant images are those characterized that you located outside.

  In the vehicle-mounted display device of the present invention, for example, the center of the visual field range is located on the center line of the steering wheel mounted on the vehicle.

  In the in-vehicle display device of the present invention, it is preferable that a center portion in the left-right direction of the far image is located at the center of the visual field range.

  In the vehicle-mounted display device of the present invention, the far-field image and the near-field image are located apart from each other without overlapping in the left-right direction when viewed from the viewer.

  Alternatively, in the in-vehicle display device of the present invention, the near image is arranged on both sides of the far image in the left-right direction, and the near images are located apart from each other without overlapping the far image. Yes.

Vehicle display device of the present invention, the proximal image, or may be located remotely without overlapping lower than the distant image viewed from the viewer.

  In the vehicle-mounted display device of the present invention, it is preferable that the area of the near image display area is smaller than the area of the far image display area as viewed from the viewer.

  The in-vehicle display device of the present invention displays, for example, a vehicle traveling speed or a vehicle traveling instruction as the far image.

  On the other hand, car navigation and driving alert are displayed as the near image.

  In the in-vehicle display device of the present invention, a distant image and a near image are displayed as virtual images in front of the curved half mirror. The half mirror here is a windshield glass of a vehicle. Or the half mirror arrange | positioned in the vehicle interior side rather than the windshield glass may be sufficient.

  A far-field image is displayed at the center of the field of view when the viewer looks at the front, for example, in front of the center of the steering wheel mounted on the vehicle. Information that is always displayed, such as instructions, and information that is frequently viewed are displayed. In addition, a near image is displayed at a position deviated from the central portion, and information with relatively low visual frequency such as car navigation and driving alert is displayed as the near image.

  A driver who is a driver always needs to direct his / her line of sight toward a far distant position in front, but only a minimum amount of information is displayed on a distant image at a position that easily enters the field of view during traveling. On the other hand, the near image displaying other information with low viewing frequency is displayed at a position closer to the far image and away from the center. For this reason, during traveling, a distant image mainly enters the field of view, and the amount of display information is small, so that it is possible to suppress viewing unnecessary information and to prevent the driver from paying attention to driving. In addition, information with a low viewing frequency or information that requires attention is displayed as a near image without overlapping with the far image, and thus does not hinder the display of the far image. Moreover, since the driver can view the near-field image only by shifting the line of sight, it is also easy to check various information.

  Further, by disposing the distant image and the near image apart from each other, even if the viewer moves his / her head, the distant and near images do not overlap with each other.

Explanatory drawing which shows the state by which the vehicle-mounted display apparatus of embodiment of this invention is mounted in the vehicle, Explanatory drawing which shows the components structure of the vehicle-mounted display apparatus of embodiment of this invention, Explanatory drawing which shows the 1st display example of the vehicle-mounted display apparatus of embodiment of this invention, Explanatory drawing which shows the 2nd display example of the vehicle-mounted display apparatus of embodiment of this invention,

  FIG. 1 shows a state in which an in-vehicle display device 10 according to an embodiment of the present invention is mounted on an automobile 1 which is an example of a vehicle.

  In the automobile 1, a windshield glass 4 is mounted between the bonnet portion 2 and the ceiling portion 3, and the vehicle compartment space 5 and the external space 6 in front of the vehicle are partitioned by the windshield glass 4. . The windshield glass 4 is curved, and the concave surface 4a of the windshield glass 4 is directed to the vehicle interior space 5, and the convex surface 4b of the windshield glass 4 is directed to the front external space 6. The windshield glass 4 functions as a half mirror having a concave curved surface.

  However, in the present invention, the windshield glass 4 does not function as a half mirror, and a curved half mirror may be separately disposed on the vehicle interior side of the windshield glass 4.

  A driver's seat 7 is provided in the passenger compartment space 5, and a steering wheel 8 is provided in front thereof. A dashboard board 9 is provided in front of the passenger compartment space 5, and the in-vehicle display device 10 according to the embodiment of the present invention is embedded in the dashboard 9. The on-vehicle display device 10 is a so-called head-up display (HUD) device.

  As schematically shown in FIG. 2, the in-vehicle display device 10 includes a transmission screen 11 and an image generation unit 18 that generates an intermediate image on the transmission screen 11. The image generation unit 18 is a DLP (Digital Light Processing) projector. This projector includes a digital mirror device, and further includes a color filter to enable multicolor display.

  A field lens 12 is provided in front of the transmission screen 11. The intermediate image formed on the transmission screen 11 is condensed by the field lens 12 and reflected upward by the total reflection mirror 13 in front of it.

  A far projection mirror 14 and a near projection mirror 15 are provided above the total reflection mirror 13. The far projection mirror 14 and the near projection mirror 15 are total reflection mirrors. The field lens 12, the total reflection mirror 13, the far projection mirror 14, and the near projection mirror 15 constitute a projection unit.

The display operation by the in-vehicle display device 10 is as follows.
The light source of the DLP projector that is the image generation unit 18 is an LED light source or a laser light source. The direction of the drawing beam emitted from the light source is controlled by a digital mirror device, and the transmission screen 11 is scanned, so that an intermediate image is formed on the transmission screen 11. It is also possible to display an intermediate image in multiple colors by using a color filter or the like. The display light that has generated the intermediate image and transmitted through the transmission screen 11 is reflected by the total reflection mirror 13, further totally reflected by the far projection mirror 14 and the near projection mirror 15, and directed toward the windshield glass 4. It is done.

  The windshield glass 4 functions as a curved half mirror. When the light reflected by the far projection mirror 14 and the near projection mirror 15 is applied to the concave surface 4a, a part of the light is directed to the eyes 21 of the viewer (driver) 20 seated in the driver seat 7. . As a result, the virtual image 25 formed in the external space 6 in front of the windshield glass 4 can be viewed with the eyes 21. The imaging position of the virtual image 25 is determined by the focal length of the field lens 12 and the curvature of the windshield glass 4.

  The projection path L1 from the total reflection mirror 13 through the far projection mirror 14 to the windshield glass 4 is longer than the projection path L2 from the total reflection mirror 13 through the near projection mirror 15 to the windshield glass 4. Therefore, the virtual image 25 formed by the projection path L <b> 1 directed from the far projection mirror 14 toward the windshield glass 4 becomes a far image 25 a at a position away from the windshield glass 4 in front of the external space 6. The virtual image 25 formed by the projection path L2 directed from the near projection mirror 15 to the windshield glass 4 is closer to the windshield glass 4 than the far image 25a in the external space 6 in front of the windshield glass 4. The near image 25b at the selected position is obtained.

  The image generation unit 18 used in the in-vehicle display device 10 for forming the far image 25a and the near image 25b uses a light source, a collimator lens, and a spatial optical modulation element such as LCOS instead of the DLP projector. It is also possible to generate a hologram image on the transmission screen 11. Alternatively, a transmissive liquid crystal display element may be used as the transmissive screen 11 and an intermediate image of the liquid crystal display formed on the transmissive screen 11 may be projected toward the field lens 12 with light from the light source. Further, as the optical system of the projection unit that separates the virtual image 25 into the far image 25a and the near image 25b, the field lens 12 is composed of two lenses having different focal lengths, and the far projection mirror 14 and the near projection mirror are used. 15 may be configured as one total reflection mirror so that the far image 25a and the near image 25b are separated and imaged by the difference in focal length between the two lenses.

  Next, display examples of the far image 25a and the near image 25b will be described with reference to FIGS.

  3 and 4 show a distant image 25a and a near image 25b, which are virtual images 25 that can be seen with the eyes 21 of the viewer 20. In both figures, the X direction is the left-right direction viewed from the viewer 20, and the Y direction is the up-down direction viewed from the viewer 20.

  In FIG. 3, a displayable region 31 in which a virtual image 25 that can be viewed by the viewer 20 can be displayed as a region surrounded by a one-dot chain line. Similarly, in FIG. 4, the displayable area 32 is shown as an area surrounded by a one-dot chain line. The displayable areas 31 and 32 are determined by the shape and area of an area where an intermediate image can be generated in the transmissive screen 11 shown in FIG. In the display example shown in FIG. 4, the area of the transmissive screen 11 is larger than that in the display example shown in FIG. 3, and as a result, the width of the displayable region 32 shown in FIG. The dimension is larger than the width dimension in the left-right direction (X direction) of the displayable area 31 shown in FIG.

  As shown in FIGS. 3 and 4, in the displayable areas 31 and 32, a part of the virtual image 25 is formed as a far image 25 a by the far projection mirror 14, and another part of the virtual image 25 is near. An image is formed as a near image 25 b by the projection mirror 15.

  The displayable range of the far image 25a is a quadrangular region surrounded by a solid line, and this region corresponds to the range that can be reflected by the far projection mirror 14 shown in FIG. The displayable range of the near image 25b is a quadrangular area surrounded by a solid line, and this area corresponds to the range that can be reflected by the near projection mirror 15 shown in FIG. The far image 25a and the near image 25b can be displayed within a range surrounded by a solid line in FIGS.

  In the display example shown in FIG. 3, the distant image 25a is displayed on a front extension line of a center line O that extends in the front-rear direction of the vehicle through the center of the steering wheel 8. This coincides with the center of the visual field range when the viewer 20 looks at the front. The distant image 25a may be formed at a position where a part of the distant image 25a is applied to the center line O. Preferably, the center of the distant image 25a in the left-right direction (X direction) coincides with the center line O. .

  The near image 25b is at a position deviating from the center line O, that is, a position deviating from the center of the visual field range when the viewer 20 looks at the front. And the center part of the left-right direction of the near image 25a is formed in the position away in the X direction from the both ends of the left-right direction of the far image 25a.

  The display example shown in FIG. 3 is the most preferable example, and the near image 25b is displayed at a position where the distance α is spaced to the right side of the far image 25a and at a position where the distance β is spaced below the far image 25a. Is done.

  Also in the display example shown in FIG. 4, the distant image 25a is displayed at the center portion that is in front of the center line O that extends in the front-rear direction of the vehicle through the center of the steering wheel 8. The near images 25b and 25b are arranged on both the left and right sides of the far image 25a. Each of the near images 25b and 25b is located apart from the far image 25a with a space left and right, and is spaced apart from the far image 25a with a space apart.

  In both the display examples of FIGS. 3 and 4, the area of the display area of each near image 25b visually recognized by the viewer 20 is smaller than the area of the display area of the far image 25a.

  In each of the display examples of FIGS. 3 and 4, information that needs to be displayed constantly or frequently viewed is displayed on the far image 25a. In the near image 25b, information that is less frequently viewed than the information displayed in the far image 25a is displayed.

  An example of information that needs to be displayed constantly as the far image 25a is a vehicle travel speed display 41, and an example of information that is frequently viewed is an arrow display 42 that indicates a vehicle traveling instruction.

  Information with low visual frequency displayed as the near image 25b includes a car navigation display 43, an energy display 45 (see FIG. 4) indicating the remaining gasoline amount and the remaining electric power, and the like. Furthermore, information with low visual frequency includes cumulative mileage display, engine speed display (tachometer display), clock display, temperature display inside and outside the vehicle, seat belt wearing warning display, and the like. Furthermore, the display 46 (refer FIG. 4) which shows driving | running | working alerting is mentioned as information with low visual frequency. This display 46 indicates that there is an obstacle in the immediate vicinity of the vehicle. When a danger should be notified, the display 46 blinks, the hue changes, or the image moves within the screen. Become.

  In this way, when the display is in a display state such as blinking when it becomes a state to be notified of danger, the viewer 20 can easily perceive the change in display at the edge of the field of view, and visually recognize the display at an appropriate timing. In addition, there is no need to consciously check at other timings.

  The far image 25a is located in the center of the front of the visual field range when the viewer 20 who is the driver of the automobile 1 looks at the front, and only information that should be always displayed as the far image 25a or information with high viewing frequency is included. It is displayed. Since the viewer 20 during driving has his / her line of sight directed to a position far away from the windshield glass 4, the far-field image 25 a tends to enter the field of view. Further, since the far-field image 25a has a limited amount of information such as information that needs to be displayed at all times and information that is frequently viewed, the display image is less likely to distract the viewer's attention while driving. For this purpose, it is preferable that the number of information simultaneously displayed as the distant image 25a during traveling is 3 information or less, and more preferably 2 information or less.

  On the other hand, the near image 25b is at a position deviating from the center of the visual field range of the viewer 20 and has a smaller display area than the far image 25a. The far-field image 25a is likely to enter the field of view, but the near-field image 25b is less likely to enter the field of view. Therefore, it is difficult for the attention of driving to be hindered by the near image 25b having a low viewing frequency.

  Further, information with a low viewing frequency displayed in the near image 25b can be confirmed simply by temporarily turning the line of sight toward the near image 25b. Further, when the driving alert display 46 appears, the viewer 20 is easily noticed by blinking the display, changing the hue, or moving the display within the screen.

  As shown in FIGS. 3 and 4, the near image 25b is located in the left-right direction and the lower direction away from the far image 25a, and the far image 25a and the near image 25b are separated. When the viewer 20 moves his / her head, the far-field image 25a and the near-field image 25b are displayed so as not to overlap each other.

O Center line X Horizontal direction Y Vertical direction 1 Automobile 4 Windshield glass 4a Concave surface 4b Convex surface 5 Car space 6 External space 10 In-vehicle display device 11 Transmission screen 14 Distant projection mirror 15 Near projection mirror 20 Viewer 25 Virtual image 25a Far image 25b Near image 31, 32 Displayable area

Claims (11)

A transmissive screen; an image generator for generating an intermediate image on the transmissive screen; and a projection unit for projecting the intermediate image onto a concave surface of a curved half mirror, and is formed in front of the convex side of the half mirror In the in-vehicle display device in which the viewer can view the virtual image from the concave side of the half mirror,
The virtual image is separated into a distant image away from the half mirror and a near image closer to the half mirror.
The far image is displayed at the center of the visual field range when the viewer looks at the front, and the near image is displayed at a position off the center of the visual field range ,
The proximal center of the lateral direction of the image, vehicle display device which is characterized that you located outside the end portion in the lateral direction of the distant images.   The vehicle-mounted display device according to claim 1, wherein the center of the visual field range is located on a center line of a steering wheel mounted on the vehicle.   The in-vehicle display device according to claim 1, wherein a center portion in the left-right direction of the far image is located at the center of the visual field range. The in-vehicle display device according to any one of claims 1 to 3, wherein the far image and the near image are located apart from each other without overlapping in the left-right direction when viewed from the viewer. The proximal image, the are disposed on both sides in the lateral direction of the distant images, each of the proximal image according to any one of the claims 1 located away without overlapping with the distant image 3 In-vehicle display device. The proximal image, vehicle display device according to any one of claims 1 located away without overlapping lower than the distant image viewed from the viewer 5. The in-vehicle display device according to any one of claims 1 to 6 , wherein an area of the display area of the near image is smaller than an area of the display area of the far image as viewed from the viewer. The in-vehicle display device according to any one of claims 1 to 7 , wherein a vehicle traveling speed is displayed as the distant image. Examples distant image, vehicle display device according to any one of claims 1 to 8 progress indication of the vehicle is displayed. Examples proximal image, vehicle display device according to any one of claims 1 car navigation is displayed 9. The in-vehicle display device according to any one of claims 1 to 10 , wherein a driving alert is displayed as the near image.

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