JP2016206266A - Arrangement method for projector of head-up display and the head-up display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arrangement method for a projector of a head-up display that can reduce obstruction in user's visibility due to the projector, and the head-up display.SOLUTION: A head-up display 1 includes a projector 2 and a combiner 4, and the projector 2 and combiner 4 are mounted independently from each other on a dashboard. The projector 2 is arranged to be shifted to a left side or a right side from a line connecting a view point A and the combiner 4 on the dashboard.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projector arrangement method for a head-up display (hereinafter referred to as HUD as appropriate) attached to a completed vehicle, for example, and a HUD in which the projector is arranged using this method.

There is a so-called built-in type in which a projector is arranged in a dashboard of a vehicle.
On the other hand, in recent years, a so-called add-on type HUD in which a projector is arranged on a dashboard and is retrofitted to a completed vehicle has also become widespread.
For example, in a conventional add-on type HUD described in Patent Document 1, a projector is disposed on a dashboard, and a combiner is attached to an upper portion of the projector.

JP 2008-179218 A

In the conventional HUD of the add-on type, there is a problem that the field of vision in front of the user is obstructed by the projector.
For example, in the HUD described in Patent Document 1, since it is necessary to provide an optical system for guiding display light to the upper combiner inside the projector, the size of the projector in the height direction is always increased. For this reason, a part of the user's field of view is blocked by the projector, and the forward visibility may deteriorate.

Some add-on type HUDs have a combiner and a projector provided independently on a dashboard, and a projector disposed in front of the combiner projects an image.
In the HUD having this configuration, an optical system that guides display light to the upper combiner is unnecessary, and therefore the size in the height direction of the projector can be reduced by the amount of the optical system. That is, the space obstructed by the projector is shifted in the vertical direction, and the forward visibility is improved by the amount shifted in the vertical direction.
However, in a conventional add-on type HUD, the projector is placed on the dashboard in front of the combiner. For this reason, the projector overlaps the line connecting the viewpoint of the user who sees the combiner from the rear of the projector and the combiner, and a part of the user's field of view is blocked by the projector. As a result, a part of the image projected on the combiner may not be visible.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to obtain a projector arrangement method and a HUD of a HUD that can reduce the obstruction of a user's view by the projector.

  The HUD projector arrangement method according to the present invention includes a projector that outputs display light and a projection member that projects the display light output from the projector, and the projector and the projection member are arranged on a support surface. A head-up display provided independently of each other is characterized in that the projector is arranged on the support surface while being shifted to the left side or the right side from the line connecting the viewpoint and the projection member.

  According to the present invention, since the projector is located at a position shifted to the left or right from the line connecting the viewpoint and the projection member, there is an effect that obstruction of the user's view by the projector can be reduced. In particular, in the case where a part of the user's field of view is obstructed even if the space obstructed by the projector is shifted in the vertical direction as described above, in the present invention, the projector is provided on the left side or the right side in addition to the vertical direction. Therefore, the visibility of the projection member is improved, and the convenience of the HUD is improved.

It is a figure which shows HUD which concerns on Embodiment 1 of this invention. It is a figure which shows the conventional HUD. It is a figure which shows HUD which concerns on Embodiment 2 of this invention. It is a figure which shows HUD which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a HUD 1 according to Embodiment 1 of the present invention. FIG. 1A is a view of HUD 1 according to the first embodiment as viewed from above, and FIG. 1B is a view of HUD 1 as viewed from the viewpoint A side. The HUD 1 is an add-on type HUD retrofitted on a dashboard that is a support surface in the vehicle, and includes a projector 2 and a combiner 4.
Further, the projector 2 and the combiner 4 are provided independently of each other on the dashboard, as shown in FIG.

The projector 2 includes a liquid crystal display unit 3. The liquid crystal display unit 3 is a component that generates an image to be displayed on the combiner 4 and includes, for example, a liquid crystal display element, a backlight, and the like.
The projector 2 outputs an image generated by the liquid crystal display unit 3 as display light.
The combiner 4 is a component that embodies the projection member in the present invention, and is a member onto which the display light output from the projector 2 is projected. For example, it is a concave mirror formed from a translucent resin material such as acrylic.

  In the present invention, for example, a plane including the straight line AB connecting the user's viewpoint A and the center point B of the combiner 4 and extending in the vertical direction, and a plane C including the center point B and extending in the vertical direction (FIG. The user visually recognizes the combiner 4 from the direction orthogonal to (indicated by a broken line). Here, in FIG. 1, the projector 2 is shifted from the line AB connecting the viewpoint A and the combiner 4 to the right side.

  FIG. 2 is a diagram showing a conventional HUD 100. 2A is a view of the conventional HUD 100 as viewed from above, and FIG. 2B is a view of the HUD 100 as viewed from the viewpoint A side. Here, the HUD 100 is an add-on type HUD retrofitted on the dashboard, similar to the HUD 1. The display light output from the liquid crystal display unit 102 of the projector 101 is projected onto the combiner 103 and an image is displayed on the projection plane.

As shown in FIG. 2A, in the conventional HUD 100, the projector 101 is disposed in front of the combiner 103. At this time, the emission surface of the display light of the projector 101 and the projection surface of the combiner 103 are in a substantially opposed state.
In this state, the projector 101 is positioned on a straight line AB connecting the user's viewpoint A and the center point B of the combiner 103.

  In the conventional HUD 100, the projector 101 is arranged with respect to the combiner 103 as described above. Therefore, when the user views the combiner 103 from the rear of the projector 101, as shown in FIG. 2B, a part of the image projected on the combiner 103 with the user's view blocked by the projector 101. Disappears.

In contrast, in the HUD 1 according to the first embodiment, the user's viewpoint A and the center point B of the combiner 4 are connected while maintaining a distance at which the display light from the projector 2 is substantially focused on the projection surface of the combiner 4. The projector 2 is displaced from the straight line AB to the left or right.
That is, as shown in FIG. 1A, the projector 2 is arranged such that the center line of the projector 2 has an angle θ1 with respect to a plane including the straight line AB and extending in the vertical direction.
By arranging in this way, most of the projector 2 is out of the user's field of view, and the image projected on the combiner 4 can be sufficiently viewed as shown in FIG.

Further, by setting the angle θ1 in the range of about 40 ° to 50 °, the projector 2 can be removed from the field of view where the user views the projection surface of the combiner 4.
In addition, you may incline only the angle (theta) 2 with respect to the plane C so that the projection surface of the combiner 4 may face the projector 2 side.
Thereby, even when the display light from the projector 2 is irradiated to the combiner 4 from an oblique direction, the image distortion on the projection surface of the combiner 4 can be reduced.
If the angle θ2 is about half the angle θ1, the user of the viewpoint A can sufficiently view the video of the combiner 4.

As described above, the HUD 1 according to the first embodiment includes the projector 2 and the combiner 4, and the projector 2 and the combiner 4 are attached independently from each other on the dashboard, and the viewpoint A and The projector 2 is shifted from the line connecting the combiner 4 to the left or right.
By disposing the projector 2 in this way, the projector 2 deviates from the field of view where the user looks at the combiner 4, so that the obstruction of the user's field of view by the projector 2 can be reduced.

In the HUD 1, the projector 2 and the combiner 4 are provided independently on the dashboard, and the projector 2 irradiates the combiner 4 with display light from an oblique direction.
For this reason, an optical system that guides display light to the upper combiner 4 as in the HUD described in Patent Document 1 is unnecessary. Therefore, the HUD 1 according to the first embodiment is smaller in size in the height direction of the projector 2 than the HUD described in Patent Document 1 by the amount of the optical system. Further, since the projector 2 is shifted to the left or right from the line connecting the viewpoint A and the combiner 4, the projector 2 is shifted to the left or right in addition to the vertical direction. Thereby, the degree to which the projector 2 blocks the user's forward view can be further reduced, the visibility of the image projected on the combiner 4 is improved, and the convenience of the HUD is improved.

Embodiment 2. FIG.
FIG. 3 is a view showing HUD 1A according to Embodiment 2 of the present invention, and shows a view of HUD 1A according to Embodiment 2 as viewed from above. In the HUD 1 </ b> A shown in FIG. 3, the positional relationship between the projector 2 and the combiner 4 is the same as that in the first embodiment, but the display light is irradiated to the combiner 4 through the optical element 5.

The optical element 5 is an optical element having a function of making the optical path length of the display light output from the projector 2 uniform, and is realized by, for example, a prism.
The optical element 5 may be disposed independently of each other as a member different from the projector 2, but may be provided integrally with the projector 2.

The display light output from the projector 2 is irradiated to the combiner 4 from an oblique direction as described above. For this reason, there is a difference in the optical path length of the display light between the side close to the projection surface of the combiner 4 and the side far from the projection surface, and distortion occurs in the projected video (virtual image).
Therefore, by irradiating the combiner 4 with the display light output from the projector 2 through the optical element 5, the optical path length of the display light can be adjusted and the distortion of the image can be reduced.

  As described above, the HUD 1A according to the second embodiment includes the optical element 5 that makes the optical path length of the display light output from the projector 2 uniform. With this configuration, it is possible to reduce the distortion of the image projected on the combiner 4.

Embodiment 3 FIG.
FIG. 4 is a diagram showing a HUD 1B according to Embodiment 3 of the present invention, and shows a view of HUD 1B according to Embodiment 3 as viewed from above. In the HUD 1B, the projector 2 is further removed from the front of the combiner 4 than in the first and second embodiments, and the display light from the projector 2 is guided to the combiner 4 using the optical elements 6 and 7.

The optical elements 6 and 7 are optical elements having a function of guiding the display light output from the projector 2 to the combiner 4 as described above, and are realized by, for example, a total reflection mirror.
The optical elements 6 and 7 may be arranged independently of each other as members different from the projector 2, but may be provided integrally with the projector 2.

Similarly to the second embodiment, an optical element 5 such as a prism may be disposed on the optical path of the display light. Thereby, the same effect as Embodiment 2 can be acquired.
Further, since the optical path length of the display light is longer in the HUD 1B than in the HUD 1 and 1A, a lens may be disposed on the optical path of the display light so that the display light is substantially focused on the projection surface.
At this time, it is possible to further improve the visibility by increasing the luminance of the liquid crystal display unit 3.

  As described above, the HUD 1B according to the third embodiment includes the optical elements 6 and 7 that guide the display light output from the projector 2 to the combiner 4. Thereby, it is possible to further shift the projector 2 to the left side or the right side from the line connecting the viewpoint A and the combiner 4, and it is possible to further reduce the obstruction of the user's view by the projector 2.

In Embodiments 1 to 3, the case where the support surface is a surface on the dashboard is shown, but the present invention is not limited to this. For example, it may be a support surface in a moving body other than a vehicle.
That is, the support surface in the present invention may be a surface on which the projector 2 and the combiner 4 can be arranged independently.

  In Embodiments 1 to 3, the case where the projection member is the combiner 4 is shown, but the present invention is not limited to this. For example, a projection surface of a windshield on which display light from the projector 2 is projected or a translucent film for projection attached to the windshield may be used as the projection member.

  In the present invention, within the scope of the invention, a free combination of each embodiment, a modification of an arbitrary component of each embodiment, or an optional component in each embodiment can be omitted.

  1, 1A, 1B Head-up display (HUD), 2 projectors, 3 liquid crystal display unit, 4 combiner, 5, 6, 7 optical elements.

Claims (4)

In a head-up display comprising: a projector that outputs display light; and a projection member that projects the display light output from the projector; and the projector and the projection member are provided independently on a support surface. ,
A projector arrangement method for a head-up display, wherein the projector is arranged on the support surface by shifting the projector to the left side or the right side from a line connecting a viewpoint and the projection member.   2. The head-up display, wherein the projector is disposed on the support surface using the method for arranging a projector of a head-up display according to claim 1.   The head-up display according to claim 2, further comprising a first optical element that uniformizes an optical path length of display light output from the projector.   4. The head-up display according to claim 2, further comprising a second optical element that guides display light output from the projector to the projection member.

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