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US 2012/0068607 A1Published application
Supervision for a light display device
AssigneeSimplexGrinnell LP
InventorJoseph D. Farley
Life of this patent
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Abstract
A device and method may include, in a display device, emitting visible light in a humanly imperceptible manner and sensing said light to verify operation of the display device.
Claims21
A light display device comprising:
- a LED emitting light in response to power supplied thereto;
- a photodetector disposed with the LED, said photodetector configured to detect intensity of light emitted from the LED and generate an electrical signal for the light emitted from the LED;
- and
- a control circuit connected to the LED and the photodetector, said control circuit configured to activate the LED for an amount of time imperceptible to a human, receive the electrical signal from said photodetector and determine whether the LED is operational.
1 more element
A device comprising:
- a LED;
- a driver circuit connected to the LED, said driver circuit configured to activate the LED wherein the activated LED is unable to be detected by a human;
- and
- a microcontroller connected to said driver circuit and the LED, said microcontroller configured to receive an indication when the LED is activated, obtain results of the activation and determine whether the LED is operational.
1 more element
A method comprising:
- activating a LED in a light display device to emit an intensity of light in response to supplied power, wherein the activated LED is imperceptible to a human;
- determining whether the LED failed to operate based on the intensity of light of the activated LED;
- and
- reporting a failure to operate of the LED.
1 more element
Dependencies are inferred from the claim text.