Patent ID: 9134536
Filing Date: 2015-09-15
Classification: B60K,G02B,G02F,G03B,G09G,H04N

Abstract:
1. A head-up display device comprising: a laser light source for emitting laser light; a laser light control unit for controlling a light intensity of the laser light; a polarization control element for polarizing the laser light, and a polarization control unit for optionally controlling a polarization angle of the laser light in the polarization control element; a polarization unit for transmitting a specific polarization component; a scanning unit, which is located on an optical path of laser light emitted from the laser light source, scans an arrived laser light, and projects a desired display image; a laser light detection unit for detecting the light intensity of the laser light; an external light detection unit for detecting illuminance of external light; and a display brightness adjustment means, which calculates a target brightness value to display the display image based on an external illuminance measurement value measured by the external light detection unit, and controls the laser light control unit and the polarization control unit, so that the display image is displayed at the target brightness value, wherein the display brightness adjustment means controls a polarization angle of the polarization control element to a polarization angle that the laser light is not dimmed in the polarization unit, via the polarization control unit, when the external illuminance measurement value is a predetermined boundary external illuminance or higher, and controls a polarization angle of the polarization control element to a polarization angle that the laser light is dimmed in the polarization unit, via the polarization control unit, when the external illuminance measurement value is the boundary external illuminance or lower.