Head-up display device

Patent metadata

Field	Value
Publication number	US-2016306169-A1
Application number	US-201515101745-A
Country	US
Kind code	A1
Filing date	Feb 26, 2015
Priority date	Apr 24, 2014
Publication date	Oct 20, 2016
Grant date	—

Abstract

A head-up display device includes a projector, an expansion optical system, an estimating part, a determination part, and a light amount control part. The projector has a light source and a liquid crystal panel. The expansion optical system expands an imagery output from the projector. The estimating part estimates a relative position of the sun with respect to a mobile unit. The determination part determines whether the liquid crystal panel is protected based on a relation between the relative position estimated by the estimating part and a solid angle representing a range in which a light from the sun is incident to the liquid crystal panel through the expansion optical system. The light amount control part decreases an amount of light incident to the liquid crystal panel when the determination part determines that the liquid crystal panel should be protected.

First claim

What is claimed is:

1 . A head-up display device that displays a virtual image of an imagery to be recognized by an occupant by projecting the imagery to a projection component in a mobile unit, the head-up display device comprising:
a projector having a light source that emits a light and a liquid crystal panel on which the imagery is formed, the projector projecting the imagery by making the light emitted from the light source to be incident on the liquid crystal panel; an expansion optical system that expands and projects the imagery output from the projector on the projection component; an estimating part that estimates a relative position of the sun relative to the mobile unit based on a position of the mobile unit and a position of the sun; a determination part that determines whether the liquid crystal panel is to be protected based on a relation between the relative position of the sun estimated by the estimating part and a solid angle which represents a range in which a light of the sun is incident to the liquid crystal panel through the expansion optical system; and a light amount control part that decreases an amount of light incident to the liquid crystal panel when the determination part determines that the liquid crystal panel is to be protected compared with a case where the determination part determines that the liquid crystal panel is not to be protected.

2 . The head-up display device according to claim 1 , wherein
the determination part determines that the liquid crystal panel is to be protected when the relative position of the sun is within an allowable range with respect to the solid angle.

3 . The head-up display device according to claim 2 , wherein
the determination part determines that the liquid crystal panel is to be protected when the relative position of the sun continues to be within the allowable range with respect to the solid angle during a preset time period.

4 . The head-up display device according to claim 1 , wherein
the light amount control part decreases the amount of light incident to the liquid crystal panel by decreasing an amount of light emitted from the light source.

5 . The head-up display device according to claim 4 , wherein
the light amount control part gradually decreases the amount of light emitted from the light source.

6 . The head-up display device according to claim 1 , further comprising:
a filter that regulates the light of the sun incident to the liquid crystal panel through the expansion optical system; and an insertion mechanism that inserts the filter into an optical path between the projection component and the liquid crystal panel, wherein the light amount control part decreases the amount of light incident to the liquid crystal panel by inserting the filter into the optical path by the insertion mechanism.

7 . The head-up display device according to claim 6 , wherein
the light amount control part controls the insertion mechanism to insert the filter into the optical path between the expansion optical system and the liquid crystal panel.

8 . The head-up display device according to claim 6 , wherein
the filter is a polarizing plate, and the light amount control part controls the insertion mechanism to insert the filter by mating a transmission axis of the filter with a polarization direction of light of the imagery.

9 . The head-up display device according to claim 6 , wherein
the light amount control part reflects at least a part of the light of the sun incident to the filter through the expansion optical system toward the expansion optical system.

10 . The head-up display device according to claim 6 , wherein
the light amount control part controls the insertion mechanism to insert the filter into the optical path when a display of the virtual image of the imagery is stopped.

Assignees

• Denso Corp

Inventors

• Nambara Takahiro

Classifications

• B60K35/50

  Instruments characterised by their means of attachment to or integration in the vehicle (B60K35/231 takes precedence) · CPC title

• B60K35/23

  Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) · CPC title

• H04N9/3182

  Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607) · CPC title

• G02B27/281

  used for attenuating light intensity, e.g. comprising rotatable polarising elements · CPC title

• G02B2027/014

  comprising information/image processing systems · CPC title