An image displayed on an image display unit is illuminated by an image illumination unit, and the image is displayed for a driver using a display optical system having at least one concave mirror element. The image illumination unit has a light emitting surface that emits an illumination light, and a lens array that divides and focuses an entrance pupil of an eye box onto the light emitting surface. With the above configuration, since the light emitting surface and the eye box have a conjugate relationship through the lens array and the display optical system, the light emitted from the light emitting surface can efficiently reach the eye box. As a result, since the light can be efficiently used for illumination, the image having high luminance can be displayed without any increase in the luminance of a light source and any reduction in the number of displayable colors.
Head-up display device and illuminating device for head-up display device
2017-12-05
Patent
Elektronische Ressource
Englisch
IPC: | G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF , Funktionsmerkmale oder Einzelheiten von Leuchten oder Beleuchtungssystemen |
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