JP2013032087A - Vehicle head-up display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle head-up display having a high additional value, by utilizing a reflection function of a dust cover multipurposely.SOLUTION: The vehicle head-up display is provided for forming a virtual image of first display information in front of the visual field of a driver by reflecting a first display light, which represents the first display information emitted from a first display, on a windshield in front of the driver's seat through an opening arranged on an upper surface of an instrument panel. The vehicle head-up display is provided with: the dust cover for closing the opening and for reflecting an external light incident from the outside of the windshield to a position being not visually recognized by the driver; and a second display for forming a virtual image of second display information in front of the visual field of the driver along with the virtual image of the first display information, by reflecting the second display light, which represents the second display information different from the first display information, on the surface of the side where the external light of the dust cover is reflected, and then reflected on the windshield.

Description

  In the present invention, an image displayed on a display device is reflected on a projection area of a windshield of a vehicle by a reflecting mirror, and is visually recognized through a windshield from a virtual image of the image projected on the projection area and an eye point of the vehicle. The present invention relates to a vehicle head-up display that allows a foreground of a vehicle to be superimposed and visually recognized.

  As a conventional vehicle head-up display, for example, the one described in Patent Document 1 is known. In the vehicle head-up display of Patent Document 1, a display body is accommodated in an instrument panel of a vehicle, and an image displayed by the display body passes through an opening provided on the upper surface of the instrument panel, A transparent projection plate reflects the driver's eye point. Thereby, the driver | operator can visually recognize a virtual image on extension of an eye point and a projection board.

  In the vehicle head-up display of Patent Document 1, the opening of the instrument panel is closed by a transparent panel member that is inclined toward the vehicle front lower side. The transparent panel functions as a dust cover for the opening.

  Further, the vehicle front side of the transparent panel member is disposed so as to sink into the inside of the instrument panel, so that the transparent panel itself is not visible to the driver. A light shielding member is provided on the vehicle front side of the transparent panel member. The surface of the transparent panel member that faces the light shielding member is formed in a concave shape. Therefore, the external light incident through the windshield is reflected by the transparent panel member, reaches the light shielding member, and is absorbed by the light shielding member, so that the external light is not directly incident on the driver's eyes. ing.

Japanese Patent Publication No.7-90730

  However, in Patent Document 1, the transparent panel member is used as a dust-proof cover for the opening of the instrument panel, and remains to reflect external light to the light shielding member. The present inventor believes that, if the reflective function of the transparent panel member can be actively utilized and used as a reflector of a new display body, it is possible to provide a vehicle head-up display with higher added value. It was.

  An object of the present invention is to provide a vehicle head-up display with high added value by utilizing the reflection function of the dustproof cover for multiple purposes as described above.

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

In the first aspect of the invention, the first display light representing the first display information emitted from the first display arranged in the instrument panel in front of the driver's seat is provided on the upper surface of the instrument panel. In a vehicle head-up display that forms a virtual image of the first display information in front of the driver's field of view by reflecting the reflected light to the windshield in front of the driver's seat through the formed opening,
Dust proof that consists of a transparent member and is placed deeper in the instrument panel toward the front of the vehicle to close the opening and reflect external light incident from the outside of the windshield to a position that is not visible to the driver A cover,
The second display light, which is arranged in the instrument panel and represents the second display information different from the first display information, is reflected on the surface of the dustproof cover on the side where the external light is reflected, and then is applied to the windshield. And a second display that forms the virtual image of the second display information together with the virtual image of the first display information in the front of the driver's visual field by reflecting the image.

  According to the present invention, a virtual image of the second display light (second display information) emitted from the second display device is positively utilized from the first display device by actively utilizing the reflection function of the dustproof cover. Since it is possible to form an image in front of the driver's visual field together with a virtual image of the emitted first display light (first display information), and display information can be increased. can do.

  In the invention according to claim 2, the reflection surface on which the outside light of the dustproof cover and the second display light are reflected is formed in a curved surface, and the virtual image of the second display information is predetermined in front of the driver's visual field. It is characterized by being enlarged and imaged far away.

  According to the present invention, the driver usually drives while looking far away in the foreground of the vehicle, so the virtual image of the second display light (second display information) is magnified and formed far away beyond a predetermined distance. This eliminates the need to change the focal position of the eyes when viewing the foreground of the vehicle and the virtual image of the second display light (second display information). Therefore, the virtual image of the second display light (second display information) can be easily seen, the burden on the driver's eyes can be reduced, and safer driving is possible.

  The invention according to claim 3 is characterized in that the reflection surface on which the external light and the second display light of the dustproof cover are reflected is subjected to an increased reflection process.

  According to the present invention, the reflectance of the second display light representing the second display information emitted from the second display device can be increased by the increased reflection process, so that the virtual image of the second display information can be further reduced. A clear image can be formed.

In the invention according to claim 4, the first display information is at least one piece of information of pedestrians, obstacles, or roads detected in front of the vehicle during night driving by the night view system,
The second display information is characterized by highlighting information displayed so as to emphasize at least one piece of information.

  According to the present invention, at least one piece of information among the information on the pedestrian, the obstacle, or the road detected by the night view system can be emphasized by the information for emphasis. It can be higher and lead to safe driving.

  The invention according to claim 5 is characterized in that the second display information is information on a destination guidance display instructed by a navigation system.

  According to the present invention, the destination guidance display information instructed by the navigation system is displayed together with the virtual image of the first display information in front of the driver's visual field. The information on the destination guidance display can be visually recognized without making any changes. Thus, the driver can reduce the frequency of turning his / her line of sight from the foreground of the vehicle, so that safer driving is possible.

  The invention according to claim 6 is characterized in that the second display information is caution information for ensuring safety based on road conditions obtained by road-to-vehicle communication.

  According to the present invention, the driver can perform an early and early treatment based on the caution information, so that safer driving is possible.

  The invention according to claim 7 is characterized in that the second display information is information indicating an inter-vehicle distance from a forward traveling vehicle obtained by an inter-vehicle distance sensor.

  According to the present invention, the driver can recognize the actual inter-vehicle distance from the forward traveling vehicle and can maintain an appropriate inter-vehicle distance by speed adjustment or the like, so that safer driving is possible. .

  The invention according to claim 8 is characterized in that the second display information is information indicating an operation state of the vehicle by lighting or color of the light source.

  According to the present invention, when the information indicating the operation state of the vehicle is information indicated by lighting or color of the light source, the driver is intuitively and instantaneously different from information indicated by numbers, letters, or the like. Can be grasped.

In the invention according to claim 9, the virtual image of the first display information is formed farther in the driver's field of view than the virtual image of the second display information.
When the speed of the vehicle is higher than the predetermined speed, the first display information is emitted from the first display, and when the speed of the vehicle is lower than the predetermined speed, the second display displays the first display information. One display information is emitted.

  According to the present invention, the driver usually drives by looking farther in the foreground of the vehicle as the speed of the vehicle increases, and by driving closer to the foreground of the vehicle as the speed of the vehicle decreases. Therefore, when the speed of the vehicle is higher than the predetermined speed, the driver can easily view the first display information emitted from the first display. Conversely, when the vehicle speed is smaller than the predetermined speed, the driver can easily recognize the first display information emitted from the second display. Therefore, when the first display information is highly important information, the driver can clearly see the first display information together with the foreground of the vehicle regardless of the vehicle speed.

It is a whole lineblock diagram showing the whole lineup of the head up display for vehicles in a 1st embodiment. It is the elements on larger scale which show the II section in FIG. (A) is a camera image formed by the first liquid crystal panel, and (b) is a caution display image formed by the second liquid crystal panel. It is explanatory drawing explaining the outline of a night view system. It is a circuit diagram which shows the control part for controlling a 1st, 2nd liquid crystal panel. (a) is a display image 1 visually recognized as a virtual image on the windshield, and (b) is a display image 2 visually recognized as a virtual image on the windshield. It is a display image visually recognized as a virtual image by the windshield in 2nd Embodiment. It is a display image visually recognized as a virtual image by the windshield in 3rd Embodiment. It is a display image visually recognized as a virtual image by the windshield in 4th Embodiment.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also a combination of the embodiments even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
A vehicle head-up display 100 according to a first embodiment will be described with reference to FIGS. FIG. 1 is an overall configuration diagram showing the overall configuration of the vehicle head-up display 100, FIG. 2 is a partially enlarged view showing a portion II in FIG. 1, and FIG. FIG. 4 is an explanatory diagram for explaining the outline of the night view system 30, and FIG. 5 is a control unit 160 for controlling the first liquid crystal panel 110 and the second liquid crystal panel 150. FIG. 6 is a display image visually recognized as a virtual image on the windshield 20.

  A vehicle head-up display (Head Up Display) 100 is applied to an automobile, and includes a first display light representing first display information emitted from the first liquid crystal panel 110, and a second liquid crystal panel 150. The second display light representing the second display information that is emitted is incident on the projection position 20a of the windshield 20 of the vehicle, and on the vehicle front extension line of the line connecting the driver M and the projection position 20a, The first display image 21 of the display information and the second display image 22 of the second display information are formed and made visible to the driver M as a virtual image. The vehicle head-up display 100 allows the driver M to visually recognize the first and second display images (virtual images) 21 and 22 and the foreground of the vehicle in a superimposed manner. Hereinafter, the vehicle head-up display 100 will be referred to as a HUD 100.

  The windshield 20 is a windshield on the front side of the vehicle, and a laminated glass formed of two sheets of glass and an intermediate film provided therebetween is used. The windshield 20 has a slight curvature, and the first and second display images 21 and 22 can be enlarged and displayed farther by the same effect as the concave mirror. Further, the windshield 20 is provided with, for example, a reflection-enhancing film on the vehicle interior side surface in order to make the noise image reflected on the vehicle interior side surface inconspicuous with respect to the regular image reflected on the vehicle interior side surface, In some cases, an intermediate film is formed in a wedge shape in cross section so that the positions of the normal image and the noise image are aligned, or a polarization process for cutting S waves is performed in the intermediate film.

  The HUD 100 is disposed inside the instrument panel 10 extending from the lower end surface of the windshield 20 to the rear of the vehicle interior and further downward. The HUD 100 includes a first liquid crystal panel 110, a reflecting mirror 120, a dustproof cover 130, a non-reflective wall 140, a second liquid crystal panel 150, a control unit 160, and the like. Hereinafter, details of each component of the HUD 100 will be described.

  The first liquid crystal panel 110 is a first display that forms first display information, and is driven and controlled by a drive circuit 164 of the control unit 160. The first liquid crystal panel 110 is arranged on the driver M side in the instrument panel 10 such that the display surface faces the top-and-bottom direction, and the axis perpendicular to the display surface faces the vehicle front-rear direction. The first liquid crystal panel 110 includes, for example, a TFT liquid crystal panel using a thin film transistor (TFT), a dual scan type display (Dual Scan Super Twisted Nematic = D-STN), a TN (Twisted Nematic) segment liquid crystal, and the like. Is used.

  The first display information formed by the first liquid crystal panel 110 is, for example, information such as vehicle speed, engine speed, engine coolant temperature, and battery voltage as vehicle information during vehicle travel. Furthermore, in the present embodiment, as the first display information, a camera image 110a (FIG. 3A) obtained by the night view system 30 during night driving is also formed on the first liquid crystal panel 110. Yes. The first liquid crystal panel 110 can be formed on the surface of the first liquid crystal panel 110 by combining a plurality of types of first display information as described above one by one or in combination. The driver M can select one of the first display information by a changeover switch (not shown).

  As shown in FIG. 4, the night view system 30 irradiates near-infrared light from the near-infrared projector 31 to the front of the vehicle at night, and among pedestrians, obstacles, roads, etc. that are difficult to see in front of the vehicle, The reflection from at least one is received by the near-infrared camera 32 and visualized, and then displayed as a camera image 110a to the driver M. The near-infrared projector 31 is mounted, for example, in a vehicle headlamp, and the near-infrared camera 32 is mounted near a rearview mirror in the vehicle interior. Here, the camera image 110a is output from the near-infrared camera 32 to the control unit 160 (microcomputer 162) of the HUD 100, and further formed as first display information on the first liquid crystal panel 110 via the drive circuit 164. It is like that.

  The first liquid crystal panel 110 includes a first light source 111. The 1st light source 111 is arrange | positioned in the instrument panel 10 at the vehicle rear side of the 1st liquid crystal panel 110, for example, the light emitting diode (Light Emitting Diode = LED) is used. The first light source 111 emits light along the axis of the first liquid crystal panel 110. The first liquid crystal panel 110 emits the first display information formed on the surface as the first display light in the axial direction opposite to the first light source 111 by the light emitted from the first light source 111. It has become.

  The reflecting mirror 120 is a mirror disposed on the vehicle front side of the first liquid crystal panel 110 in the instrument panel 10. The reflecting mirror 120 is formed as a concave mirror for enlarging the reflected image, and the reflecting surface is inclined so that the rear side of the vehicle faces downward so as to face the first liquid crystal panel 110 and the windshield 20. The reflecting mirror 120 projects the first display light (first display information) emitted from the first liquid crystal panel 110 through the opening 10a formed in the upper surface of the instrument panel 10 and the projection position 20a of the windshield 20. To reflect. In other words, the reflecting mirror 120 forms first display light (first display information) as a first reflected image (virtual image) 121 at a position opposite to the projection position 20a and forms an image at the projection position 20a. Let

  The dust cover 130 closes the opening 10 a of the instrument panel 10, transmits the first display light emitted from the first liquid crystal panel 110, and further receives external light (FIG. 2) entering from the outside of the windshield 20. It is a plate-like member that reflects the non-reflective wall 140 and reflects the second display light emitted from the second liquid crystal panel 150 to the windshield 20 (projection position 20a). The dustproof cover 130 is made of a transparent resin such as acrylic or polycarbonate, or transparent glass. The dust cover 130 is disposed in the instrument panel 10 so as to incline downward from the vehicle rear side of the opening 10a toward the vehicle front side, that is, from the vehicle rear side of the opening 10a toward the vehicle front side. It arrange | positions so that it may fill up and may block the opening part 10a. Therefore, the dust cover 130 is disposed at a position that is not directly visible to the driver M seated in the driver's seat.

  And the surface which spreads in the plate shape of the dust cover 130 is formed in the curved surface. Specifically, the front side (upper side) surface of the dust cover 130 facing the windshield 20 is formed as a concave surface that is recessed downward. Further, the surface on the front side of the dustproof cover 130 is a reflective surface that reflects external light and the second display light from the second liquid crystal panel 150. This reflective surface is used to increase the reflectance of light. Increased reflection treatment is applied.

  The non-reflective wall portion 140 is a plate-like member disposed so as to close the space between the vehicle front side end of the opening 10a of the instrument panel 10 and the vehicle front side end of the dust cover 130, and is transparent. It is formed from resin or transparent glass. The surface of the non-reflective wall 140 that faces the front (upper) surface of the dustproof cover 130 is painted black, for example, so as to absorb incident light. The non-reflective wall 140 transmits light (second display light) emitted from the front side of the vehicle (second liquid crystal panel 150) to the dustproof cover 130 side.

  The second liquid crystal panel 150 is a second display that forms second display information, and is driven and controlled by the drive circuit 164 of the control unit 160. The second liquid crystal panel 150 is disposed on the vehicle front side of the non-reflective wall 140 in the instrument panel 10 such that the display surface faces the top-and-bottom direction and the axis perpendicular to the display surface faces the vehicle front-rear direction. Yes. As the second liquid crystal panel 150, for example, a TFT liquid crystal panel, a dual scan type display, a TN segment liquid crystal, or the like is used as in the first liquid crystal panel 110.

  The second display information formed by the second liquid crystal panel 150 is, for example, for at least one information among pedestrians, obstacles, roads, and the like detected by the night view system 30 during night driving, The information for emphasis displayed so as to be emphasized to the driver M, that is, the attention display image 150a. As shown in FIG. 3B, the caution display image 150a is a mark having, for example, a ring shape and an elliptical outer shape.

  The second liquid crystal panel 150 includes a second light source 151. The second light source 151 is disposed on the vehicle front side of the second liquid crystal panel 110 in the instrument panel 10. For example, a light emitting diode (LED) is used in the same manner as the first light source 111. The second light source 151 emits light to the surface on the front side (upper side) of the dustproof cover 130 through the second liquid crystal panel 150 and the non-reflection wall 140. The second liquid crystal panel 150 emits the second display information displayed on the surface as the second display light to the front surface of the dust cover 130 by the light emitted from the second light source 151.

  The second display light (second display information) emitted from the second liquid crystal panel 150 is reflected by the surface on the front side of the dust cover 130, passes through the opening 10 a of the instrument panel 10, and the projection position 20 a of the windshield 20. It is supposed to be reflected by the. In other words, the second display light (second display information) is formed as a second reflected image (virtual image) 122 at a position opposite to the projection position 20a by the dust cover 130 and formed at the projection position 20a. It has come to be.

  The controller 160 is a control unit that controls the display state of the first display information on the first liquid crystal panel 110 and the second display information on the second liquid crystal panel 150. As shown in FIG. 5, the control unit 160 operates by being supplied with electric power from the battery 50 when the ignition switch 40 of the vehicle is turned on. The control unit 160 includes an operation switch 161, a microcomputer 162, various sensor groups 163, a drive circuit 164, and the like.

  The operation switch 161 is a switch for operating and stopping the HUD 100. When the operation switch 161 is turned on, the first display information is formed on the first liquid crystal panel 110 and the second display information is formed on the second liquid crystal panel 150. Put into operation.

  The microcomputer 162 performs the first operation based on detection signals detected by the various sensor groups 163, data of the camera image 110a output from the near-infrared camera 32, and a selection signal (not shown) selected by the driver M. The display information and the second display information are determined, and an instruction for forming each display information is output to the drive circuit 164.

  The various sensor groups 163 are sensors for detecting vehicle information when the vehicle is running. For example, a vehicle speed sensor that detects the vehicle speed, an engine speed sensor that detects the engine speed, a water temperature sensor that detects the engine coolant temperature, And a voltage sensor for detecting the battery voltage of the battery 50. Detection signals detected by the various sensor groups 163 are output to the microcomputer. The near-infrared camera 32 also outputs a point to be noted in the camera image 110a, for example, the position coordinates of the detected “pedestrian” on the screen together with the camera image 110a.

  The drive circuit 164 controls the first and second liquid crystal panels 110 and 150 so that each display information determined by the microcomputer 162 is formed by the first liquid crystal panel 110 and the second liquid crystal 150.

  Next, the operation and effect of the HUD 100 based on the above configuration will be described.

  The dustproof cover 130 functions as a cover that closes the opening 10 a of the instrument panel 10. Therefore, foreign matter such as dust and dirt does not enter the instrument panel 10 from the opening 10a. Further, as shown in FIG. 2, external light entering from the outside of the windshield 20 is reflected by the surface on the front side of the dust cover 130 and absorbed by the non-reflective wall 140. Therefore, the driver M does not feel dazzling.

  When the driver M turns on the operation switch 161, the HUD 100 is activated. The microcomputer 162 determines the first display information and the second display information to be displayed based on the instruction of the driver M, and supplies the first liquid crystal panel 110 and the second liquid crystal panel 150 to the first liquid crystal panel 110 and the second liquid crystal panel 150 via the drive circuit 164, respectively. 1 display information and 2nd display information are formed.

  The first liquid crystal panel 110 causes the reflecting mirror 120 to emit the first display information as the first display light by the light emitted from the first light source 111. The reflecting mirror 120 reflects the first display light (first display information) emitted from the first liquid crystal panel 110 to the projection position 20 a of the windshield 20 through the opening 10 a of the instrument panel 10. The first display light (first display information) reflected on the projection position 20a is displayed on the first display image 21 (on the front side of the driver's field of view) on the vehicle front extension line of the line connecting the driver M and the projection position 20a. The image is formed as a virtual image) and is visually recognized by the driver M.

  Further, the second liquid crystal panel 150 causes the light emitted from the second light source 151 to emit the second display information as the second display light to the dustproof cover 130 through the non-reflection wall 140. The dust cover 130 reflects the second display light (second display information) emitted from the second liquid crystal panel 150 to the projection position 20 a of the windshield 20 through the opening 10 a of the instrument panel 10. The second display light (second display information) reflected by the projection position 20a is displayed on the second display image 22 (in front of the driver's field of view) on the vehicle front extension line of the line connecting the driver M and the projection position 20a. The image is formed as a virtual image) and is visually recognized by the driver M.

  During daytime driving, the first display image 21 is, for example, a vehicle speed, engine speed, engine cooling water temperature, and battery voltage selected by the driver M's selection in front of the driver's M field of view. Is displayed. In this case, the second display image 22 is not particularly set.

  On the other hand, when driving at night, it is possible to display the camera image 110a using the night view system 30 and the predetermined caution display image 150a. Specifically, as shown in FIG. 6, the HUD 100 displays the camera image 110 a as the first display image 21 and the caution display image 150 a as the second display image 22 in front of the field of view of the driver M. To do. The attention display image 150a is displayed at a predetermined position in the camera image 110a as shown in FIG. That is, at night, when the night view system 30 finds a pedestrian that is difficult to see with the naked eye of the driver M, this is a sign for indicating that the pedestrian is ahead. Note that the caution display image 150a may be displayed so as to match the position of the pedestrian based on the position coordinates of the pedestrian in the camera image 110a, as shown in FIG. 6B. .

  As described above, in the present embodiment, in addition to the virtual image (first display image 21) of the first display light (first display information) emitted from the first liquid crystal panel 110 in front of the field of view of the driver M. By actively utilizing the reflection function of the dust cover 130, it is possible to display a virtual image (second display image 22) of the second display light (second display information) emitted from the second liquid crystal panel 150. Yes. Thereby, since display information can be increased, it can be set as HUD100 with high added value.

  Further, since the reflection surface on which the external light and the second display light of the dust cover 130 are reflected is formed in a curved surface, a virtual image of the second display light (second display information) is displayed in front of the driver's visual field. The image is magnified and formed far away beyond a predetermined distance. As a result, the driver M usually drives while looking far away in the foreground of the vehicle, so that the virtual image of the second display light (second display information) is enlarged and formed farther than a predetermined distance. Thus, it is not necessary to change the focal position of the eyes when visually recognizing the foreground of the vehicle and the virtual image of the second display light (second display information). Therefore, the virtual image of the second display light (second display information) can be easily seen, the burden on the driver's eyes can be reduced, and safer driving is possible.

  Further, since the reflection surface on which the external light and the second display light of the dust cover 130 are reflected has been subjected to an increase reflection process, the second display information indicating the second display information emitted from the second liquid crystal panel 150 is provided. Since the reflectance of the display light can be increased, the virtual image of the second display light (second display information) can be formed more clearly.

  In addition, the first display information is at least one piece of information such as a pedestrian, an obstacle, or a road detected in front of the vehicle by the night view system 30 during night driving, and the second display information is The information for emphasis displayed so as to emphasize the at least one information, that is, the attention display image 150a. As a result, at least one piece of information can be emphasized by the caution display image 150a, so that the driver's attention can be further increased, leading to safe driving.

(Second Embodiment)
First display information and second display information visually recognized by the windshield 20 in the second embodiment are shown in FIG. Compared to the first embodiment, the second embodiment uses the first display information as vehicle speed (speed display image 110b) as vehicle information, and the second display information is obtained from a navigation system (not shown). This is a guidance display (destination display image 150b).

  The speed display image 110b is displayed as speed information (here 53 km / h) obtained by the vehicle speed sensor among the various sensor groups 163. The destination display image 150b is displayed as destination guidance display information (150m ahead left turn instruction) when route guidance is being executed by the navigation system. In the second embodiment, route guidance data of the navigation system is input to the microcomputer 162. The microcomputer 162 displays the speed display image 110b on the first liquid crystal panel based on the vehicle speed detected by the vehicle speed sensor. 110, and a destination display image 150b required every time during route guidance is formed on the second liquid crystal panel 150 based on the guidance data.

  Accordingly, the destination display image 150b instructed by the navigation system is displayed together with the speed display image 110b in front of the driver M's field of view, so that the driver M changes the line of sight to the navigation screen. The destination display image 150b can be visually recognized. Therefore, the driver M can reduce the frequency of diverting his / her line of sight from the foreground of the vehicle, so that safer driving is possible.

(Third embodiment)
FIG. 8 shows the first display information and the second display information visually recognized by the windshield 20 in the third embodiment. In the third embodiment, the first display information is obtained as vehicle speed (speed display image 110b) as vehicle information, and the second display information is obtained by road-to-vehicle communication (not shown) as compared to the first embodiment. The warning information is based on the road condition (caution display image 150c).

  The speed display image 110b is displayed as speed information (here 53 km / h) obtained by the vehicle speed sensor among the various sensor groups 163. The caution display image 150c is displayed as caution information obtained by road-to-vehicle communication (a caution arrow mark such as a person coming out from the left side of the next intersection). In the third embodiment, data on road conditions (movement of other vehicles, movement of people, etc.) in the traveling region of the own vehicle obtained by road-to-vehicle communication is input to the microcomputer 162. Causes the first liquid crystal panel 110 to form the speed display image 110b on the basis of the vehicle speed detected by the vehicle speed sensor, and the caution display image required for the driver M each time based on the road condition data. 150 c is formed on the second liquid crystal panel 150.

  As a result, the driver M can perform an early treatment for the driver M based on the caution display image 150c, thereby enabling safer driving.

(Fourth embodiment)
FIG. 9 shows the first display information and the second display information visually recognized by the windshield 20 in the fourth embodiment. In the fourth embodiment, the first display information is the vehicle speed (speed display image 110b) as the vehicle information, and the second display information is the inter-vehicle distance from the forward traveling vehicle, compared to the first embodiment. Information (inter-vehicle distance display image 150d) is shown.

  The speed display image 110b is displayed as speed information (here 53 km / h) obtained by the vehicle speed sensor among the various sensor groups 163. Further, the inter-vehicle distance display image 150d is displayed as, for example, information indicating an inter-vehicle distance from a forward traveling vehicle obtained by an active cruise control system (not shown) (an elliptical ring mark indicating the forward traveling vehicle and an inter-vehicle distance value of 50 m). . In the fourth embodiment, the data of the forward traveling vehicle of the active cruise control system is input to the microcomputer 162, and the microcomputer 162 displays the speed display image 110b based on the vehicle speed detected by the vehicle speed sensor. The first liquid crystal panel 110 is formed, and the inter-vehicle distance display image 150d is formed on the second liquid crystal panel 150 based on the data of the vehicle traveling ahead.

  As a result, the driver M can recognize the actual inter-vehicle distance from the forward traveling vehicle and can maintain an appropriate inter-vehicle distance by speed adjustment or the like, so that safer driving is possible.

(Other embodiments)
In contrast to the above embodiments, the second display information visually recognized by the second liquid crystal panel 150 may be information indicating the operating state of the vehicle by the lighting or color of the light source. For example, in the engine coolant temperature and the battery voltage, the green light is turned on in a safe state, the orange light is turned on if attention is required, and the red light is turned on if the vehicle is to be stopped. Alternatively, the light sources are arranged in the horizontal direction of the display field, and if there is a danger prediction on the left side of the vehicle as a display corresponding to the caution display image 150c, the light source on the left side of the display field is turned on. If there is a danger prediction on the right side of the vehicle, the light source on the right side of the display field may be turned on.

  Thus, if the information indicating the operating state of the vehicle is information indicated by lighting or color of the light source, unlike the information indicated by numbers, letters, etc., the driver M intuitively and instantaneously operates the vehicle. The state can be grasped.

  Further, the first display information displayed on the first liquid crystal panel 110 and the second display information displayed on the second liquid crystal panel 150 may be switched according to the speed of the vehicle. For example, the first display information is displayed farther in the driver M's field of view than the second display information. When the vehicle speed is higher than the predetermined speed, the first display information is emitted from the first liquid crystal panel 110, and when the vehicle speed is lower than the predetermined speed, the second liquid crystal panel 150 is output. The first display information is emitted from.

  Normally, the driver M drives while looking farther in the foreground of the vehicle as the speed of the vehicle increases, and drives closer to the foreground of the vehicle as the speed of the vehicle decreases. Therefore, when the vehicle speed is higher than the predetermined speed, the driver can easily view the first display information emitted from the first liquid crystal panel 110. Conversely, when the vehicle speed is smaller than the predetermined speed, the driver can easily recognize the first display information emitted from the second liquid crystal panel 150. Therefore, when the first display information is highly important information, the driver can clearly see the first display information together with the foreground of the vehicle regardless of the vehicle speed.

  In addition, the first and second displays have been described as using a TFT liquid crystal panel, a dual scan type display, a TN segment liquid crystal, and the like. However, the present invention is not limited to this. A light emitting display may be used. Furthermore, a laser projector that scans a laser may be used.

  Further, the first and second display devices are not limited to those that form an image like a liquid crystal panel, but are printed with a fixed display such as an arrow or a caution mark, and are displayed by light emission of a light source. It is good as a thing.

  In the HUD 100 according to various embodiments, the first display information and the second display information are displayed on the windshield 20. However, the present invention is not limited to this, and a dedicated display reflector may be used.

DESCRIPTION OF SYMBOLS 10 Instrument panel 10a Opening part 20 Windshield 30 Navigation system 100 Vehicle head-up display 110 1st liquid crystal panel (1st indicator)
110a Camera image (first display information, pedestrian, obstacle, or road information)
130 Dust-proof cover 150 Second liquid crystal panel (second display)
150a Caution display image (second display information, information for emphasis)
150b Destination display image (second display information, destination guidance display information)
150c Caution display image (second display information, attention information)
150d Inter-vehicle distance display image (second display information, information indicating inter-vehicle distance)

Claims (9)

The first display light representing the first display information emitted from the first display device arranged in the instrument panel in front of the driver's seat is passed through the opening provided on the upper surface of the instrument panel. In a vehicle head-up display that forms a virtual image of the first display information in front of the driver's field of view by reflecting it on a windshield in front of the vehicle,
A position that is made of a transparent member and is arranged so as to go deeper in the instrument panel toward the front side of the vehicle to block the opening, and outside light incident from outside the windshield is not visible to the driver A dust cover that reflects to
After reflecting the 2nd display light which is arrange | positioned in the said instrument panel and represents the 2nd display information different from the said 1st display information on the surface by which the said external light of the said dustproof cover is reflected. And a second display for reflecting the virtual image of the second display information together with the virtual image of the first display information in front of the driver's field of view by reflecting the light on the windshield. A vehicle head-up display.   A reflection surface on which the outside light and the second display light of the dust cover are reflected is formed in a curved surface, and a virtual image of the second display information is far away from the driver's visual field by a predetermined distance or more. The vehicle head-up display according to claim 1, wherein the image is enlarged and imaged.   3. The vehicle head-up display according to claim 1, wherein a reflection surface on which the outside light and the second display light of the dust-proof cover are reflected is subjected to an increase reflection process. 4. The first display information is at least one piece of information of pedestrians, obstacles, or roads detected in front of the vehicle during night driving by the night view system,
4. The vehicle head-up according to claim 1, wherein the second display information is information for emphasis that is displayed so as to emphasize the at least one information. 5. display.   The vehicle head-up display according to any one of claims 1 to 3, wherein the second display information is information on a destination guidance display instructed by a navigation system.   4. The vehicle according to claim 1, wherein the second display information is caution information for ensuring safety based on road conditions obtained by road-to-vehicle communication. Head-up display.   The vehicle head according to any one of claims 1 to 3, wherein the second display information is information indicating an inter-vehicle distance from a forward traveling vehicle obtained by an inter-vehicle distance sensor. Up display.   4. The vehicle head-up display according to claim 1, wherein the second display information is information indicating an operating state of the vehicle by lighting or color of a light source. 5. The virtual image of the first display information is formed farther in the driver's field of view than the virtual image of the second display information.
When the speed of the vehicle is higher than a predetermined speed, the first display information is emitted from the first indicator, and when the speed of the vehicle is lower than the predetermined speed, the second display The vehicle head-up display according to any one of claims 1 to 3, wherein the first display information is emitted from the display.

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