JP2007186016A - Head-up display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device for a vehicle without using a concave mirror. <P>SOLUTION: This head-up display device 1 for the vehicle is furnished with a transmission type screen 4, a projector 2 furnished with a magnifying lens 21 and a reflecting member 5. The transmission type screen 4 is arranged on an opening part 61 provided below a wind shield 7 on an instrument panel 6, and the projector 2 is arranged on the back side of the transmission type screen 4 and projects display information as an optical image 2A on the transmission type screen 4. The reflecting member 5 reflects display light of the optical image 2A projected on the transmission type screen 4 and makes a driver M view it as a virtual image 2B, and the magnifying lens 21 projects the optical image 2A on the transmission type screen 4 by enlarging it. Consequently, it is possible to provide the head-up display device for the vehicle without using the concave mirror. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle head-up display device.

  The vehicle head-up display device (HUD) displays driving information on a windshield, so that the driver can know the driving information without moving his line of sight to the meter device.

  The HUD generally includes a transparent cover disposed in an opening of an instrument panel located below the windshield, a liquid crystal display disposed on the back side of the transparent cover, a reflecting mirror including a concave mirror, a window A reflective layer formed on the inner surface of the shield (see Patent Document 1).

The liquid crystal display displays an optical image representing operation information and emits display light of the optical image. The reflecting mirror reflects the display light from the liquid crystal display toward the reflecting layer, and the concave mirror in the reflecting mirror reflects the display light from the liquid crystal display so that the optical image is enlarged. The reflecting layer receives the reflected light from the reflecting mirror through the transparent cover and reflects it toward the driver. Thereby, HUD can enlarge the optical image of a liquid crystal display as a virtual image, and can make a driver | operator visually recognize because a reflective layer reflects the reflected light from a reflective mirror to a driver | operator side.
JP 2003-118426 A

  However, since the optical image of the liquid crystal display is magnified by the concave mirror, there is a risk that distortion occurs in the virtual image that is visually recognized by the driver.

  In addition, extraneous light may be reflected on the upper surface of the transparent cover and enter the driver's eyes. In order to prevent the reflected light from entering the driver's eyes, generally, the transparent cover is formed to be curved so as to be recessed with respect to the instrument panel. As a result, a step is generated between the transparent cover and the instrument panel, and the sense of unity is lost, resulting in a problem that the appearance is impaired.

  The present invention has been made in view of the above points, and a first object of the present invention is to provide a vehicle head-up display device that does not use a concave mirror.

  A second object of the present invention is to provide a vehicle head-up display device in which no step is generated on the instrument panel.

  In order to achieve the above object, the present invention employs the following technical means.

  The vehicle head-up display device according to claim 1 is a transmissive screen disposed in an opening provided below the windshield in the instrument panel and a transmissive screen disposed behind the transmissive screen. A projector that projects display information as an optical image on the mold screen, and a reflective member that reflects the display light of the optical image projected on the transmission screen and visually recognizes the driver as a virtual image. A magnifying lens that magnifies and projects an optical image is provided.

  In this configuration, the transmissive screen is disposed in the opening of the instrument panel, and the projector projects display information on the transmissive screen as an optical image, and the display light of the optical image is reflected by the reflecting member as a virtual image. Make it visible to the driver. In addition, the projector includes a magnifying lens that magnifies and projects an optical image on a transmissive screen.

  The optical image projected on the transmissive screen is magnified in proportion to the length of the optical path between the projector and the transmissive screen by the magnifying lens of the projector. For this reason, it is not necessary to enlarge an optical image using a concave mirror, and the vehicle head-up display apparatus which does not use a concave mirror can be provided. As a result, the problem of virtual image distortion due to the concave mirror can be solved.

  According to a second aspect of the present invention, there is provided a vehicle head-up display device including a plane mirror that reflects display light from a projector to a transmission screen and projects an optical image on the transmission screen.

  This configuration includes a plane mirror that reflects display light from the projector to the transmission screen and projects an optical image on the transmission screen. Accordingly, it is possible to increase the length of the optical path between the projector and the transmission screen without increasing the distance between them, and it is possible to further enlarge the optical image projected on the transmission screen. That is, it is possible to increase the virtual image visually recognized by the driver while obtaining the above-described effect without increasing the distance between the projector and the transmission screen.

  According to a third aspect of the present invention, there is provided a vehicle head-up display device comprising: a transmissive screen disposed in an opening provided below the windshield in the instrument panel and having light diffusibility; and a rear side of the transmissive screen. A projector that is disposed and projects display information as an optical image on a transmissive screen; and a reflective member that reflects the display light of the optical image projected on the transmissive screen and visually recognizes the driver as a virtual image. The screen has a fine unevenness on the upper surface of the transmissive screen on the windshield side, and the upper surface is formed substantially flush with the upper surface of the instrument panel on the windshield side.

  In this configuration, a transmissive screen having light diffusibility is disposed in the opening of the instrument panel, and a projector projects display information on the transmissive screen as an optical image, and the display light of the optical image is reflected by a reflecting member. It is reflected and made visible to the driver as a virtual image.

  Here, since the transmission screen is not colorless and transparent but has light diffusibility, fine irregularities can be formed on the upper surface of the transmission screen on the windshield side. For this reason, in this configuration, fine irregularities are formed on the upper surface of the transmissive screen on the windshield side. Thereby, extraneous light is diffused by the fine irregularities on the upper surface of the transmission screen. For this reason, it is possible to prevent the extraneous light from being reflected on the upper surface of the transmissive screen and entering the driver's eyes, and the upper surface of the transmissive screen is substantially flush with the upper surface of the instrument panel on the windshield side. It becomes possible to do.

  For this reason, in this configuration, the upper surface of the transmission screen is formed substantially flush with the upper surface of the instrument panel on the windshield side. As a result, it is possible to provide a vehicle head-up display device in which no step is generated between the transmissive screen and the instrument panel. For this reason, the sense of unity between the transmissive screen and the instrument panel is not impaired, and the appearance is not impaired.

  In the vehicle head-up display device according to claim 4, the transmissive screen has fine irregularities on the windshield side upper surface of the transmissive screen, and the upper surface is substantially the same as the windshield side upper surface of the instrument panel. The structure is formed to be flush with each other.

  In this configuration, since the configuration according to claim 1 and the configuration according to claim 3 are provided together, the above-described effects described therein can be obtained together.

  The vehicle head-up display device according to claim 5 is configured such that the reflecting member is formed on the inner surface of the windshield.

  Even with this configuration, the above-described effects can be obtained.

  A vehicle head-up display device according to the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic diagram showing an overall configuration of a vehicle head-up display device 1 according to a first embodiment of the present invention.

  FIG. 2 is a schematic view showing the instrument panel 6, the windshield 7 and the periphery thereof in front of the vehicle interior.

  FIG. 3 is a circuit configuration diagram illustrating an electrical circuit configuration of the vehicle head-up display device 1 according to the first embodiment of the present invention.

  FIG. 4 is a front view illustrating a display example of the reflective layer 5 which is the reflective member illustrated in FIGS. 1 and 2.

  FIG. 5 is a front view showing another display example of the reflective layer 5 shown in FIGS. 1 and 2.

  As shown in FIG. 1, the vehicle head-up display device (HUD) 1 includes a projector 2, a plane mirror 31, a transmissive screen 4, and a reflective layer 5 that is a reflective member.

  The projector 2 is disposed behind the transmissive screen 4 (lower side in FIG. 1) and projects display information such as vehicle information on the transmissive screen 4 as an optical image 2A. As the projector 2, for example, a digital light processing (DLP) projector including a digital micro device (DMD) and a light source is used.

  In DMD, a large number of mirrors of about several micrometers and a square are arranged on a silicon substrate to reflect light and project an optical image on a screen. Whether or not the light from the light source of the DLP projector is reflected on the screen is controlled by electrically controlling the direction of the minute mirror. Thereby, the DLP projector can project an optical image on the screen.

  Instead of the DLP projector, it is also possible to use a liquid crystal projector provided with a liquid crystal panel and a light source for illuminating the liquid crystal panel.

  The projector 2 also includes a magnifying lens 21 that magnifies and projects the optical image 2A onto the transmissive screen 4.

  The transmissive screen 4 is disposed in an opening 61 provided below the windshield 7 in the instrument panel 6 so as to efficiently diffuse display light from the projector 2 and project a high-contrast optical image 2A. Furthermore, it has light diffusibility. The transmissive screen 4 is formed so as to have light diffusibility, for example, by adding a light diffusing material made of fine particles to a translucent resin.

  An embossed surface having fine irregularities is formed on the upper surface 41 of the transmission screen 4 on the windshield 7 side, and the upper surface 41 is formed substantially flush with the upper surface 62 of the instrument panel 6 on the windshield 7 side.

  Since the transmissive screen 4 is not colorless and transparent but has light diffusibility, even if a textured surface is formed on the upper surface 41, the projection of the optical image 2A is not greatly affected. For this reason, the embossed surface can be formed on the upper surface 41. As a result, it is possible to prevent extraneous light from being reflected on the upper surface 41 of the transmissive screen 4 and directly entering the eyes of the driver, and the upper surface 41 of the transmissive screen 4 is connected to the upper surface 61 of the instrument panel 6. It becomes possible to form it substantially flush.

  As a result, it is possible to provide the HUD 1 in which no step is generated between the transmission screen 4 and the instrument panel 6. For this reason, the sense of unity between the transmissive screen 4 and the instrument panel 6 is not impaired, and the appearance is not impaired.

  The plane mirror 31 reflects the display light from the projector 2 to the transmissive screen 4 and projects the optical image 2A on the transmissive screen 4.

  The reflection layer 5 is formed on the inner surface of the windshield 7 and above the instrument panel 6 on the driver's seat side (right side in FIG. 2). The optical image 2A projected on the transmission screen 4 is converted into a virtual image 2B. Make M visible. The reflective layer 5 can also be formed as a semi-transparent half mirror.

  The electric circuit configuration of the HUD 1 according to the present embodiment described above will be described with reference to FIG.

  Electric power is constantly supplied from the battery 15 to the control device 9 composed of a microcomputer or the like. An ignition switch 14 is connected so as to be able to detect its operating state (on or off), a speed sensor 11 for detecting the traveling speed of the automobile, a rotation sensor 12 for detecting the rotational speed of the engine of the automobile, and fuel of the automobile A fuel sensor 13 or the like for detecting the remaining amount is connected so that these detection signals can be input. The projector 2 is also connected to the control device 9.

  Hereinafter, the operation of the present embodiment in the above configuration will be described.

  When the ignition switch 14 is turned on by the driver, the control device 9 detects it and starts operation. That is, in FIG. 4, based on the output signal from the sensor 11-13, the vehicle speed, engine speed, and remaining amount of fuel of the vehicle are calculated, and the projector 2 is operated based on these. In other words, the projector 2 emits display light indicating the vehicle speed, the engine speed, and the remaining amount of fuel, which are display information.

  As shown in FIG. 1, the display light emitted from the projector 2 enters the plane mirror 31 along the optical path P11, and is reflected toward the transmission screen 4 along the optical path P12 by the plane mirror 31. As described above, the transmissive screen 4 has light diffusibility so as to efficiently diffuse display light from the projector 2. Therefore, the transmissive screen 4 can receive the reflected light from the plane mirror 31 and project the high-contrast optical image 2A.

  The display light of the optical image 2A projected on the transmission screen 4 is reflected by the reflective layer 5 according to the optical paths P13 and 14, and is visually recognized by the driver M as a virtual image 2B.

  Here, as described above, since the projector 2 includes the magnifying lens 21 that magnifies and projects the optical image 2A onto the transmissive screen 4, the optical image 2A is enlarged in proportion to the lengths of the optical paths P11 and P12. Is done. Further, the plane mirror 31 can increase the length of the optical paths P11 and P12 between the projector 2 having the magnifying lens 21 and the transmission screen 4 without increasing the distance between them. Therefore, the optical image 2A projected on the transmissive screen 4 can be further enlarged without increasing the distance between the projector 2 and the transmissive screen 4, and as a result, the virtual image 2B to be visually recognized by the driver M can be further increased. Can be bigger.

  The virtual image 2B is visually recognized as shown in FIG. That is, as a virtual image 2B, a speed display unit 51 that displays the traveling speed of the vehicle, a rotation display unit 52 that displays the rotational speed of the engine of the vehicle, a fuel display unit 53 that displays the remaining amount of fuel of the vehicle, and the like. Is displayed.

  As described above, it is not necessary to enlarge the optical image using the concave mirror, and a HUD that does not use the concave mirror can be provided. As a result, the problem of virtual image distortion due to the concave mirror can be solved.

  Further, as described above, it is possible to provide the HUD 1 in which no step is generated between the transmissive screen 4 and the instrument panel 6. For this reason, the sense of unity between the transmissive screen 4 and the instrument panel 6 is not impaired, and the appearance is not impaired.

  As described above, the vehicle head-up display device 1 according to the present embodiment includes the transmissive screen 4 disposed in the opening 61 provided below the windshield 7 in the instrument panel 6, and the transmissive screen 4. And a projector 2 that projects display information as an optical image 2A on the transmissive screen 4 and reflects the display light of the optical image 2A projected on the transmissive screen 4 as a virtual image 2B. The projector 2 includes a magnifying lens 21 that magnifies and projects the optical image 2 </ b> A onto the transmissive screen 4.

  Thereby, the head-up display apparatus 1 for vehicles which does not use a concave mirror can be provided. As a result, the problem of virtual image distortion due to the concave mirror can be solved.

  The vehicle head-up display device 1 according to the present embodiment includes a transmissive screen 4 disposed in an opening 61 provided below the windshield 7 in the instrument panel 6 and having light diffusibility, and a transmissive type. The projector 2 is disposed behind the screen 4 and projects display information as an optical image 2A on the transmissive screen 4, and the display light of the optical image 2A projected on the transmissive screen 4 is reflected to operate as a virtual image 2B. And a reflective layer 5 that is a reflective member to be visually recognized by the person M. The transmissive screen 4 has fine irregularities on the windshield 7 side upper surface 41 of the transmissive screen 4, and the upper surface 41 is an instrument panel. 6 is configured to be substantially flush with the upper surface 62 on the windshield 7 side.

  Thereby, the head-up display device 1 for vehicles which does not produce a level | step difference in the instrument panel 6 can be provided.

  In the above-described example, the vehicle speed, the engine speed, and the remaining amount of fuel are displayed as display information as the virtual image 2B. However, the display information is not limited to this.

  For example, as the display information, it is also possible to display the images of the front both ends of the vehicle taken by a camera (not shown) as a virtual image 2B divided into left and right as shown in FIG.

  In addition, a sign as display information can be displayed as a virtual image 2B as shown in FIG.

  Specifically, the control device 9 includes a map database (hereinafter referred to as a map DB) in which data on roads, signs, and the like are stored, and the control device 9 includes a GPS (Global Positioning System) antenna and an orientation sensor (not shown). Etc. are connected. The GPS antenna is an antenna for receiving radio waves transmitted from a well-known GPS satellite, and the azimuth sensor is constituted by a well-known geomagnetic sensor, gyroscope, or the like.

  Based on the signals from the GPS antenna, the vehicle speed sensor 11 and the direction sensor, the control device 9 identifies the position of the vehicle in the map DB, extracts a sign to be visually recognized by the driver ahead from the map DB, This is displayed as a virtual image 2B.

  It is also possible to adopt a configuration in which these displays are switched by a changeover switch (not shown).

  Further, the plane mirror 31 can be omitted in FIG. In this case, the projector 2 is arranged at a predetermined distance below the transmissive screen 4 so that the display light can directly enter the transmissive screen 4.

  Further, the reflective layer 5 is not formed on the inner surface of the windshield 7, and for example, a plate material on which the reflective layer 5 is formed can be fixed to the instrument panel 6.

(Second Embodiment)
FIG. 6 is a schematic diagram showing an overall configuration of the vehicle head-up display device 1 according to the second embodiment of the present invention.

  In the second embodiment, a plane mirror 32 is added to the first embodiment, whereby the projector 2 projects a meter display as display information as an optical image 2C on the transmission screen 8 arranged as a meter device. .

  Specifically, the display light of the lower half of the magnifying lens 21 of the projector 2 is reflected by the plane mirror 31 to project the optical image 2A on the transmission screen 4, and the display light of the upper half of the magnifying lens 21 of the projector 2 is projected. The optical image 2C is projected on the transmission screen 8 by being reflected by the plane mirror 32 according to the optical paths P21 and P22.

  Thereby, it is possible to configure both the vehicle head-up display device 1 and the meter device (transmission type screen 8) by one projector 2.

  Note that the present invention is not limited to the above-described example, and combinations thereof and other various modifications are conceivable.

FIG. 1 is a schematic diagram showing an overall configuration of a vehicle head-up display device 1 according to a first embodiment of the present invention. FIG. 2 is a schematic view showing the instrument panel 6, the windshield 7 and the periphery thereof in front of the vehicle interior. FIG. 3 is a circuit configuration diagram illustrating an electrical circuit configuration of the vehicle head-up display device 1 according to the first embodiment of the present invention. FIG. 4 is a front view showing a display example of the reflecting member 5 shown in FIGS. 1 and 2. FIG. 5 is a front view showing another display example of the reflecting member 5 shown in FIGS. 1 and 2. FIG. 6 is a schematic diagram showing an overall configuration of the vehicle head-up display device 1 according to the second embodiment of the present invention.

Explanation of symbols

1 Vehicle head-up display (HUD)
DESCRIPTION OF SYMBOLS 2 Projector, 21 Magnifying lens, 31, 32 Plane mirror 4, 8 Transmission type screen, 41 Upper surface 5 Reflective layer (reflective member), 51 Speed display part, 52 Rotation display part, 53 Fuel display part 6 Instrument panel, 61 Upper surface, 7 Windshield 9 Control device, 11 Vehicle speed sensor, 12 Rotation sensor, 13 Fuel sensor 14 Ignition switch, 15 Battery

Claims (5)

A transmissive screen disposed in an opening provided below the windshield in the instrument panel;
A projector disposed behind the transmissive screen and projecting display information as an optical image on the transmissive screen;
A reflective member that reflects the display light of the optical image projected on the transmissive screen and visually recognizes it as a virtual image;
The vehicle head-up display device, wherein the projector includes a magnifying lens that magnifies and projects an optical image on the transmissive screen.   The vehicle head-up display device according to claim 1, further comprising a plane mirror that reflects display light from the projector onto the transmission screen and projects an optical image on the transmission screen. A transmissive screen disposed in an opening provided below the windshield in the instrument panel and having light diffusibility;
A projector disposed behind the transmissive screen and projecting display information as an optical image on the transmissive screen;
A reflective member that reflects the display light of the optical image projected on the transmissive screen and visually recognizes it as a virtual image;
The transmissive screen has fine irregularities on the windshield side upper surface of the transmissive screen, and the upper surface is formed substantially flush with the windshield side upper surface of the instrument panel. A vehicle head-up display device.   The transmissive screen has fine irregularities on the windshield side upper surface of the transmissive screen, and the upper surface is formed substantially flush with the windshield side upper surface of the instrument panel. The vehicle head-up display device according to claim 1, wherein the head-up display device is used for a vehicle.   The vehicle head-up display device according to any one of claims 1 to 4, wherein the reflecting member is formed on an inner surface of the windshield.

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