# US 8,786,190 B2 · Lighting device for vehicles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,190 B2 - Document ID: US8786190B2 - Status: Granted - Kind: B2 - Application number: 13/372,752 - Filed: 2012-02-14 - Published: 2012-08-23 - Granted: 2014-07-22 - Earliest claimed: 2011-02-18 - Assignees: GM Global Technology Operations LLC - Applicants: Frank Langkabel; Joerg Kathmann; Ingolf Schneider - Inventors: Frank Langkabel; Joerg Kathmann; Ingolf Schneider - Web page: https://patentgrep.com/patent/US8786190B2 ## CPC - B60Q 1/0023: {the element being a sensor, e.g. distance sensor, camera} - B60Q 1/2696: {Mounting of devices using LEDs} - B60Q 11/005: {for lighting devices, e.g. indicating if lamps are burning or not} - H05B 45/00: Circuit arrangements for operating light-emitting diodes [LED] - H05B 45/40: Details of LED load circuits - H05B 45/52: in a parallel array of LEDs - H05B 45/58: involving end of life detection of LEDs - H05B 45/325: Pulse-width modulation [PWM] - B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The lighting device according to claim 1, further comprising a grid of a plurality of grid cells, the plurality of grid cells separated from adjacent grid cells by light-opaque webs, wherein the first LED of the plurality of the LEDs and the first failure recognition sensor are provided in a first grid cell and the second LED of the plurality of the LEDs and the second failure recognition sensor are provided in a second grid cell. ### Claim 3 (depends on 2) The lighting device according to claim 2, wherein the grid cells comprise reflectors. ### Claim 4 (depends on 1) The lighting device according to claim 1, wherein the failure recognition detector each comprise an output terminal configured to display the quantity of light, and the lighting device comprises a demultiplexer comprising at least two inputs and at least one output, the at least two inputs connected to the output terminals and the at least one output coupled to an analysis circuit. ### Claim 5 (depends on 4) The lighting device according to claim 4, wherein the analysis circuit is a microcontroller. ### Claim 6 (depends on 1) The lighting device according to claim 1, wherein the first LED and the second LED are removable from the lighting device. ### Claim 7 (depends on 1) The lighting device according to claim 1, wherein 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. ### Claim 8 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. ### Claim 9 (depends on 8) The vehicle according to claim 8, further comprising a grid of a plurality of grid cells, the plurality of grid cells separated from adjacent grid cells by light-opaque webs, wherein the first LED of the plurality of the LEDs and the first failure recognition detector are provided in a first grid cell and the second LED of the plurality of the LEDs and the second failure recognition detector are provided in a second grid cell. ### Claim 10 (depends on 9) The vehicle according to claim 9, wherein the grid cells comprise reflectors. ### Claim 11 (depends on 9) The vehicle according to claim 9, wherein the failure recognition sensors each comprise an output terminal configured to display the quantity of light, and the lighting device comprises a demultiplexer comprising at least two inputs and at least one output, the at least two inputs connected to the output terminals and the at least one output coupled to an analysis circuit. ### Claim 12 (depends on 11) The vehicle according to claim 11, wherein the analysis circuit is a microcontroller. ### Claim 13 (depends on 1) The lighting device according to claim 1, wherein the combined circuit is a parallel circuit. ### Claim 14 (depends on 1) The lighting device according to claim 1, wherein the combined circuit is a series circuit. ### Claim 15 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.