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US 8,786,190 B2Granted
Lighting device for vehicles
AssigneeGM Global Technology Operations LLC
InventorsFrank Langkabel, Joerg Kathmann, Ingolf Schneider
Life of this patent
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Abstract
A lighting device for vehicle lights is provided that includes, but is not limited to LEDs arranged in a combined parallel/series circuit. A first photodiode is used to recognize the lighting of a first LED and a second photodiode is provided to recognize the lighting of a second LED of the plurality of LEDs.
Claims15
A lighting device for vehicle lights, comprising:
- a plurality of LEDs arranged in a combined electrical circuit,
- a first failure recognition detector comprising a photodiode that has a sensor surface with a surface normal that points in the direction of the central axis of a first LED of the plurality of LEDs, the first failure recognition detector being configured to recognize the lighting of the first LED;
- and
- a second failure recognition detector comprising a photodiode that has a sensor surface with a surface normal that points in the direction of the central axis of a second LED of the plurality of LEDs, the second failure recognition detector being configured to recognize the lighting of the second LED.
1 more element
A vehicle, comprising:
- a lighting device, comprising:
- a plurality of LEDs arranged in a combined electrical circuit,
- a first failure recognition detector with a first photodiode comprising a sensor surface with a surface normal that points in the direction of the central axis of a first LED of the plurality of LEDs, the first failure recognition photo diode being configured to recognize the lighting of the first LED;
- a second failure recognition detector with a second photodiode comprising a sensor surface with a surface normal that points in the direction of the central axis of a second LED of the plurality of LEDs, the second failure recognition photo diode being configured to recognize the lighting of the second LED and,
- a display device configured to display an error message if one of the analysis sensors detects a faulty LED.
2 more elements
A lighting device for vehicle lights, comprising:
- a plurality of LEDs arranged in a combined parallel/series electrical circuit, the first LED is configured for activation with a pulse-width-modulated signal and an output signal of the first failure recognition detector are queried synchronously with the pulse-width-modulated signal,
- a first failure recognition detector configured to recognize the lighting of a first LED;
- and
- a second failure recognition detector configured to recognize the lighting of a second LED of the plurality of LEDs.
1 more element
Dependencies are inferred from the claim text.