METHOD AND DEVICE FOR LED CHANNEL MANAGMENT IN LED DRIVER
First Claim
1. A method comprising:
- providing a light emitting diode (LED) driver comprising a voltage source having an output configured to couple to a head end of each of one or more LED strings of a LED panel and a plurality of LED channels, each LED channel comprising an LED channel input configured to couple to a tail end of a corresponding LED string; and
for a first mode of the LED driver;
configuring each LED channel to inhibit current flow through the LED channel during the first mode;
configuring the voltage source to provide a predetermined first voltage at the output; and
determining, for each LED channel, whether the LED channel is coupled to an operative LED string based on a voltage at the LED channel input of the LED channel.
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Abstract
Disclosed are example open channel detection techniques at a light emitting diode (LED) driver of an LED system. The LED driver does not enable its LED channels before normal operation so as to inhibit current flow through the LED channels during start-up. While the LED channels are disabled, the LED driver compares the voltages at the LED channel inputs with a predetermined voltage to determine whether an operational LED string of an associated LED panel is connected to the LED channel. In the event that an LED channel is determined to be an “open” channel, the LED driver further disables the LED channel for the following normal operational mode. Otherwise, if the LED channel is determined to be connected to an operational LED string, the LED driver enables the LED channel for the normal operational mode, during which the LED channel can be selectively activated for light output subject to display data for the LED panel.
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Citations
20 Claims
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1. A method comprising:
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providing a light emitting diode (LED) driver comprising a voltage source having an output configured to couple to a head end of each of one or more LED strings of a LED panel and a plurality of LED channels, each LED channel comprising an LED channel input configured to couple to a tail end of a corresponding LED string; and for a first mode of the LED driver; configuring each LED channel to inhibit current flow through the LED channel during the first mode; configuring the voltage source to provide a predetermined first voltage at the output; and determining, for each LED channel, whether the LED channel is coupled to an operative LED string based on a voltage at the LED channel input of the LED channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
a light emitting diode (LED) driver comprising; a voltage source having an output configured to couple to a head end of each of one or more LED strings of a LED panel; and a plurality of LED channels, each LED channel comprising an LED channel input configured to couple to a tail end of a corresponding LED string; a LED channel detector configured to; for a first mode of the LED driver; configure each LED channel to inhibit current flow through the corresponding LED channel input during the first mode; configure the voltage source to provide a predetermined first voltage at the output; and determine, for each LED channel input, whether the LED channel is coupled to an operative LED string based on a voltage at the LED channel input. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a light emitting diode (LED) panel; and a LED driver comprising an output coupled to the LED panel, a first LED channel coupled to a tail end of an operative LED string, and a second LED channel that is not coupled to a tail end of an operative LED string, the LED driver configured to; determine the first LED channel is coupled to an operative LED string based on a first voltage at an input of the first LED channel input while the LED channel is configured to inhibit current flow during a start-up mode; and determine the second LED channel is not coupled to an operative LED string of the LED panel based on a second voltage at an input of the second LED channel while the LED channel is configured to inhibit current flow during the start-up mode. - View Dependent Claims (19, 20)
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Specification