Abstract: A method for turning on or off a first and/or a second laser diode of an illumination device. A first laser diode of the illumination device for emitting a first light beam within a first wavelength range is turned on by a control unit of the illumination device. The first wavelength range changes depending on a temperature of the first laser diode. The first laser diode is turned off by the control unit depending on a comparison of a first wavelength value of the first light beam emitted by the first laser diode with a first wavelength threshold value. A second laser diode of the illumination device for emitting a second light beam within a second wavelength range is turned on or left on by the control unit at the second point in time depending on the comparison of the first wavelength value with the first wavelength threshold value.

Abstract: An optical system for a virtual retinal display. The system includes: an image source; an image processing device; a projector unit including a light source generating a light beam and a controllable deflection device for the light beam for scanning projection of the image content; a first redirection unit comprising a first mirror and a statically mounted optical unit, the controllable deflection device projecting the image content onto the first mirror, and the first mirror directs the projected image content onto the statically mounted optical unit; a second redirection unit, the optical unit projecting image content onto the second redirection unit, the second redirection unit directing the projected image content onto an eye of a user.

Abstract: A method for turning on or off a first and/or a second laser diode of an illumination device. A first laser diode of the illumination device for emitting a first light beam within a first wavelength range is turned on by a control unit of the illumination device. The first wavelength range changes depending on a temperature of the first laser diode. The first laser diode is turned off by the control unit depending on a comparison of a first wavelength value of the first light beam emitted by the first laser diode with a first wavelength threshold value. A second laser diode of the illumination device for emitting a second light beam within a second wavelength range is turned on or left on by the control unit at the second point in time depending on the comparison of the first wavelength value with the first wavelength threshold value.

Abstract: An optical system for a virtual retinal display. The system includes: an image source; an image processing device; a projector unit including a light source generating a light beam and a controllable deflection device for the light beam for scanning projection of the image content; a first redirection unit comprising a first mirror and a statically mounted optical unit, the controllable deflection device projecting the image content onto the first mirror, and the first mirror directs the projected image content onto the statically mounted optical unit; a second redirection unit, the optical unit projecting image content onto the second redirection unit, the second redirection unit directing the projected image content onto an eye of a user.