JP3785461B2 - Head-up display method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle head-up display system, and more particularly to a full-color high-luminance head-up display apparatus system that can withstand daytime use.
[0002]
[Prior art]
Conventionally, for example, a vehicle head-up display has been proposed in order to obtain a high-luminance head-up display (for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 05-131866 (second page, FIG. 1)
[0004]
In the above document, a combiner glass is provided on the front side of a liquid crystal display so that the angle of incident light from the display is reflected by the Brewster angle. It was necessary to give the combiner glass a polarizing plate function or to increase the reflectivity of the combiner glass.
[0005]
However, in the apparatus configured as described above, a material that realizes the polarization function while keeping the transmittance of the combiner glass high is expensive and unrealistic. On the other hand, if the reflectivity of the combiner glass is increased without using the polarization function, the transmittance decreases and the foreground becomes difficult to see from the driver's seat. In addition, there is a problem that it becomes impossible to satisfy the condition of the windshield transmittance of 70% or more determined by the Road Traffic Law.
[0006]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems, and provides a head-up display system capable of obtaining a high-luminance head-up display that can be seen even in the daytime and realizing a full-color display at low cost. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes an image generation unit, a stacked display unit that displays an image of a real image that is installed at a position where light emitted from the image generation unit forms a real image, A vehicle head-up display system having a translucent combiner that reflects light that has formed a real image in the multilayer display unit and reaches a viewpoint , wherein the multilayer display unit refracts light from the image generation unit. A planar prism that directs the central optical axis toward the combiner, a Fresnel lens that enhances directivity by making light rays outside the center of the light beam transmitted through the planar prism substantially parallel to the central optical axis, and a real image In order to display an image, a ground glass member whose outer surface is irregularly reflected, and light from the outside is reflected by the ground glass member and reflected by the combiner to reach the viewpoint. And the translucent member including a black dye in order to lack, but is characterized in that are sequentially stacked. The invention described in claim 2 is characterized in that, in claim 1, the combiner regularly includes a light shielding material .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing an embodiment of the present invention, in which an image generator 1 and a reflector 2 are built in a dashboard 8, and an opening is provided in the upper part of the dashboard 8. A structure in which the laminated display portion 3 is fitted into the structure is adopted. The laminated display unit 3 is installed at a position where the light emitted from the image generation unit 1 is reflected upward by the reflection plate 2 to form a real image. The position and size of the combiner 5 are determined so that the light that forms the real image further passes through the laminated display unit 3, is reflected by the translucent combiner 5 that is in close contact with the windshield 6, and reaches the viewpoint 7. . Here, the viewpoint 7 is the eye position when an average body type driver is seated in the driver's seat.
[0009]
The image generation unit 1 includes a light source 11 having a high brightness such as a mercury lamp, an image display element 12 capable of full color display, and a lens 13. The lens 13 is adjusted so as to form a real image on the multilayer display unit 3. An image information generation unit 91 is connected to the image display element 12. Further, a shielding part 9 is provided on the upper part of the dashboard 8. The power supply unit 92 is connected to the image information generation unit 91 and the image generation unit 1 via the power supply control unit 93.
[0010]
FIG. 2 is an explanatory diagram of the multilayer display unit 3. The multilayer display unit 3 includes a plurality of multilayer functions. Each layer is a transparent or translucent treated glass or plastic structure that shares the functions required to implement the invention.
[0011]
FIG. 3 shows an example of the structure of the combiner 5. A transparent combiner substrate 51 includes thin inclusions 52 that block light rays in a horizontal and parallel manner as shown in the figure, and a metal vapor deposition film 53 is formed on the inner surface. To have.
[0012]
In FIG. 1, first, light emitted from a high-intensity light source 11 such as a mercury lamp is reflected upward through an image display element 12 capable of full-color display, a lens 13, and a reflector 2, and is reflected on the multilayer display unit 3. A full-color real image is formed. The image display element 12 operates according to the image information from the image information generation unit 91, and controls the light rays emitted from the light source 11 to generate a full color image. The laminated display unit 3 is translucent and is provided in the opening at the top of the dashboard 8. The light that forms a real image here is further transmitted through the laminated display unit 3 and brought into close contact with the windshield 6. Reflected by the combiner 5 and reaches the viewpoint 7. As a result, the driver occupying the place corresponding to the viewpoint 7 sees the full-color virtual image 4 outside the windshield 6. The combiner 5 is translucent, so that the driver can see the foreground and the virtual image 4 superimposed over the windshield 6. The shielding unit 9 at the top of the dashboard 8 prevents the scattered light of the real image formed on the laminated display unit 3 from directly reaching the viewpoint 7 without passing through the combiner 5. In the figure, it is prevented as indicated by a two-dot chain line. The power from the power supply unit 92 is supplied to the image information generation unit 91 and the image generation unit 1 via the power supply control unit 93.
[0013]
In FIG. 2, the light beam reflected through the reflecting plate 2 first reaches the stacking function 31. The stacking function 31 is, for example, a planar prism, changes the angle of all optical axes from the reflecting plate 2, and the center light is limited by the installation positions of the image generating unit 1, the reflecting plate 2, the stacked display unit 3, and the combiner 5. If the axis does not point in the direction of the viewpoint 7, the optical axis is directed toward the viewpoint 7. In the figure, a chain line indicates the optical axis before correction, and a solid line correction 1 indicates the optical axis after correction. Stacking function 1 is one side may be perpendicular (theta ₁₎ plane prism as shown in FIG. 4, the efficiency of the display area, that is order to area reduction of the non-display section, an improved planar prism is preferred. In the figure, θ ₁ is 90 degrees, but it is preferable to have a structure that matches the refractive index and the incident angle θ ₂ as θ ₃ . When the prism structure is fine and the non-display portion is narrow, the presence of the non-display portion is hardly noticed by human eyes.
[0014]
The light then reaches the stacking function 32. The stacking function 32 changes the light beam on the outer periphery deviating from the center of the light beam that has passed through the stacking function 31 so as to be substantially parallel to the central light beam. For example, it is realized with a Fresnel lens. Since the light beam that has passed through the lens 13 travels in the direction of diffusing from the center, it is directed to the center to prevent the periphery of the screen from becoming darker than the center when viewed from the viewpoint 7. In the figure, a one-dot chain line indicates an optical path before correction, and a solid line correction 2 indicates an optical path after correction. However, when the center of the optical axis is completely aligned with the viewpoint 7, the light source 11 may be directly visible, and is slightly shifted from the central optical axis in order to give trouble to the driver. As means for correcting the darkness of the center of the screen, there is a method of increasing the diffuse reflectance of the stacking function 33 described below, but this causes a problem that high luminance cannot be obtained as a whole.
[0015]
The light beam passes through the stacking function 32 and then reaches the stacking function 33. The stacking function 33 has, for example, a ground glass shape whose upper surface is irregularly reflected, and the positional relationship among the lens 13, the reflector 2, and the multilayer display unit 3 is determined so that the focal length of the lens 13 matches the irregularly reflecting surface. The ground glass-like surface of the stacking function 33 diffuses light rays to some extent and generates a real image, but the transmittance of the ground glass portion is increased so as to avoid a decrease in the amount of light to the viewpoint 7 due to irregular reflection.
[0016]
The light beam that has passed through the stacking function 33 then reaches the stacking function 34. In order to reduce light from the outside world passing through the windshield 6, irradiating the ground glass-like surface of the laminating function 33, diffusely reflecting, and partially reflecting the light from the combiner 5 and reaching the viewpoint 7. The stacking function 34 is made of a material that is transparent but contains black pigment. This may be achieved by attaching a black film.
[0017]
In addition, in FIG. 3, when the transparent combiner substrate 51 has a thickness and the structure shown in the figure including the inclusion 52, external light from above passes through the windshield 6 and the combiner 5. By blocking only the light rays from above and not affecting the front view from the viewpoint 7 (driver), the surface of the laminated function 33 is irradiated and irregularly reflected, and some of the light rays are reflected. It is possible to further prevent the light from being reflected by the combiner 5 and reaching the viewpoint 7. Moreover, it is not necessary to reduce the transmittance of the combiner 5 when viewed from the viewpoint 7.
[0018]
As described above, according to the above-described embodiment, the provision of the laminated display unit 3 allows the light rays to efficiently concentrate on the viewpoint 7, so that it is possible to realize a high-luminance head-up display that can be seen even in the daytime. Is obtained. In addition, the multilayer display unit 3 employs a display method that generates a real image on the surface thereof, and full color display can be realized at a lower cost than holographic display. Furthermore, the fact that a high-intensity head-up display can be obtained can also be used for daytime applications, enables large-screen display, and has the effect of greatly expanding the use of head-up displays. For example, conventionally, an infrared image is used for displaying simple information in a narrow range, such as displaying the vehicle speed in a single color with 7 segments and three digits, or displaying an arrow used for navigation in a single color, or even on a wide screen. Was displayed in a single color for night use, or had limited use.
[0019]
In this embodiment, the reflection plate 2 is used. However, the generated image of the image information generation unit 91 is generated by being inverted, the reflection plate 2 is omitted, and the light is directly transmitted from the image generation unit 1 to the multilayer display unit 3. May be irradiated. In this method, display images can be applied without distinction between characters, figures, full-dot images, still images, and moving images.
[0020]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain a high-luminance head-up display display that can be seen even in the daytime, and there is an excellent effect that a full-color display can be realized at low cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged perspective view of the same laminated display unit.
FIG. 3 is a drawing showing the structure of the combiner of the above.
FIGS. 4A and 4B are diagrams showing the structure of the stacking function 31 of the stacking display unit, wherein FIG. 4A shows before improvement, and FIG. 4B shows after improvement.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Image generation part 2 Reflector 3 Stacking display part 4 Virtual image 5 Combiner 6 Windshield 7 View point 8 Dashboard 9 Shielding part 11 Light source 12 Image display element 13 Lens 31, 32, 33, 34 Lamination function 51 Combiner board 52 Inclusion 53 Metal deposition film 91 Image information generation unit 92 Power supply unit 93 Power supply control unit

Claims (2)

An image generation unit, a laminated display unit that is installed at a position where the light emitted from the image generation unit connects the real images, and displays the real image image, and reflects the light that forms the real image on the multilayer display unit to reach the viewpoint A head-up display system for a vehicle having a semi-transparent combiner , wherein the laminated display unit refracts light from the image generation unit and directs a central optical axis toward the combiner, and the planar prism Fresnel lens that enhances directivity by making outer peripheral rays off the center of rays that have passed through the center substantially parallel to the central optical axis, and a ground glass-like member whose outer surface is irregularly reflected to form and display a real image And a translucent member containing a black pigment in order to reduce light from the outside world from being reflected by the ground glass-like member and reflected from the combiner to reach the viewpoint. Head-up display system, characterized in that it is laminated. 2. The head-up display system according to claim 1 , wherein the combiner regularly includes a light shielding material .

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