Supervision for a light display device
First Claim
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1. A method for determining operability of a LED in a light display device, comprising:
- initiating a reduced current test by activating the LED with a reduced drive current relative to a normal drive current to cause the LED to begin emitting light, the light emitted with an intensity that is imperceptible to a human;
sensing an intensity of light emitted from the LED; and
determining whether the LED is operational by comparing said sensed intensity with a predetermined intensity value.
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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.
5 Citations
27 Claims
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1. A method for determining operability of a LED in a light display device, comprising:
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initiating a reduced current test by activating the LED with a reduced drive current relative to a normal drive current to cause the LED to begin emitting light, the light emitted with an intensity that is imperceptible to a human; sensing an intensity of light emitted from the LED; and determining whether the LED is operational by comparing said sensed intensity with a predetermined intensity value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device comprising:
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a LED; a driver circuit connected to the LED; and a microcontroller connected to said driver circuit and the LED, said microcontroller configured to initiate a reduced current test to determine the operability of the LED, wherein during the reduced current test the microcontroller is configured to; activate the LED via the driver circuit with a reduced drive current relative to a normal drive current to cause the LED to begin emitting light, the light emitted with an intensity that is unable to be detected by a human; receive an indication when the LED is activated; obtain results of the activation; and determine whether the LED is operational. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for determining operability of a LED in a light display device, comprising:
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initiating a reduced current test by activating the LED with a reduced drive current relative to a normal drive current to cause the LED to begin emitting light, the light emitted with a reduced intensity as compared to a normal operating intensity; sensing an intensity of light emitted from the LED; and determining whether the LED is operational by comparing said sensed intensity with a predetermined intensity value. - View Dependent Claims (22, 23, 24)
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25. A method comprising:
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initiating a flash test to determine the operability of a LED in a light display device, wherein the flash test comprises one of activating the LED for a time period of less than about 15 microseconds and activating the LED for a pulse width of 20 microseconds or less;
wherein the flash test reduces a drive current relative to a normal drive current to cause the LED to begin emitting light, and wherein the light is emitted with an output intensity that is imperceptible to a human; anddetermining whether the LED failed to operate based on the output intensity of the flash of light emitted by the LED. - View Dependent Claims (26, 27)
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Specification