Digital license plate with active response to narrowband license plate recognition
AssigneeRevivermx, Inc.
InventorsJohn Michael Spall, Matthias Thomas Peter Pfeiffer
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Abstract
A digital license plate includes a display system capable of showing a license number readable by camera systems even under poor external lighting conditions. A light redistribution element is positioned near the display system and a lighting system is positioned to direct light from the light redistribution element and toward the display system. In some embodiments the lighting system includes a narrowband lighting element such as can be provided by a narrowband light source, and the display system includes an electrophoretic or LCD display.
Claims20
A digital license plate comprising a dynamic display system configured to show a designated information using visible light;
- a lighting system comprising:
- at least one visible light source for generating the visible light of a broadband spectrum and a plurality of narrowband light sources for generating narrowband light of different wavelength than that of the at least one visible light source;
- a plurality of sensors respectively activates in response to a trigger signal of a particular wavelength;
- a controller connected to the sensors to receive the trigger signal and configured to activate the narrowband light source to generate narrowband light based on a combination of the sensors activated by the trigger signal;
- and a light redistribution element configured and positioned to receive the visible light from the visible light source and the narrowband light from the narrowband light source, the light redistribution element directs the visible and narrowband light toward the display system, a showing of the designated information is not disrupted by the narrowband light.
A method of operating a digital license plate, comprising:
- generating broadband visible light using at least one visible light source;
- displaying a designated information on a dynamic display system using the visible light;
- providing a plurality of narrowband light sources for generating narrowband light of different wavelength than that of the at least one visible light source;
- providing a plurality of sensors respectively activates in response to a trigger signal of a particular wavelength
- detecting the trigger signal using at least one of the sensors;
- activating one of the narrowband light sources to generate narrowband light based on a combination of the sensors activated by the trigger signal;
- and
- redistributing light by using a light redistribution element positioned to receive the visible and narrowband light and direct the visible and narrowband light toward the display system without disrupting a showing of the designated information.
Dependencies are inferred from the claim text.