HEAD-UP DISPLAY

Abstract

The purpose of the present invention is to provide a head-up display which does not easily cause a feeling of strangeness in the way in which a virtual image disappears with the movement of a point of view while achieving improved light use efficiency. An image display unit displays, in a display area, a display image comprising a plurality of pixels, and emits display light based on the display image, a projection unit guides the display light from the image display unit to the viewer side, and generates an visual region in which at least part of a virtual image of the display image is visually recognizable, and a light distribution unit adjusts a position to which the display light is distributed with respect to each pixel of the display area to which the display light is emitted or with respect to an area including a plurality of pixels, and distributes the display light such that an area that cannot be visually recognized as the virtual image gradually increases from an end of the display area as the point view moves away from a predetermined reference point of the visual region.

Claims

1. A head-up display comprising: an image display unit which displays a display image comprising a plurality of pixels in a display area, and emits display light based on the display image; a projection unit which guides the display light from the image display unit to a viewer side, and generates a visual region where at least a part of a virtual image of the display image is visually recognizable; and a light distribution unit which adjusts a position where the display light emitted from the image display unit is distributed, wherein the light distribution unit adjusts a position where the display light is distributed for each pixel of the display area from which the display light is emitted or for each area including a plurality of pixels, and distributes the display light such that an area that cannot be visually recognized as the virtual image gradually increases from an end of the display area as a viewpoint moves away from a predetermined reference point of the visual region.

2. The head-up display according to claim 1, wherein the light distribution unit distributes the display light so that an entire display area can be visually recognized as a virtual image within a predetermined area including the reference point of the visual region.

3. The head-up display according to claim 1, wherein the display light distributed to the visual region has a top hat shaped light intensity distribution.

4. The head-up display according to claim 1, wherein the light distribution unit distributes the display light to reach the visual region after odd times of crossing of a principal ray of the display light emitted from each of the pixels arranged in at least a primary direction of the display area.

5. The head-up display according to claim 2, wherein the display light distributed to the visual region has a top hat shaped light intensity distribution.

6. The head-up display according to claim 2, wherein the light distribution unit distributes the display light to reach the visual region after odd times of crossing of a principal ray of the display light emitted from each of the pixels arranged in at least a primary direction of the display area.

7. The head-up display according to claim 3, wherein the light distribution unit distributes the display light to reach the visual region after odd times of crossing of a principal ray of the display light emitted from each of the pixels arranged in at least a primary direction of the display area.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG. 1 is a schematic diagram showing a state that a head-up display of the present invention directs display light to a visual region.

[0036] FIG. 2 is a diagram showing a path of display light emitted from each pixel of an image display unit according to a first embodiment of the present invention and a light intensity distribution of the display light in an eyebox.

[0037] FIG. 3 is a diagram showing a path of display light emitted from each pixel of an image display unit according to a second embodiment of the invention and a light intensity distribution of the display light in an eyebox.

[0038] FIG. 4 is a diagram showing a path of display light emitted from each pixel of a conventional image display unit and a light intensity distribution of the display light in an eyebox.

INDUSTRIAL APPLICABILITY

[0039] The present invention is applicable to a head-up display for generating a virtual image, and is particularly suitable for a head-up display mounted on a vehicle.

DESCRIPTION OF REFERENCE NUMERALS

[0040] 1 HUD (Head-up display) [0041] 2 Transmissive refection unit [0042] 3 Visual region [0043] 10 Image display unit [0044] 11 Laser light source [0045] 12 Scanning unit [0046] 13 Screen [0047] 14 Field lens (Light distribution unit) [0048] 20 Projection unit [0049] 31, 32, 33 Light intensity distribution [0050] L (L1, L2, L3) Display light [0051] Lp (L1p, L2p, L3p) Principal ray