Led failure detecting device
AssigneeMacroblock, Inc.
InventorsPing-Kai HUANG, Chung-Ta TSAI
Life of this patent
Estimating the term…
Abstract
A light emitting diode (LED) failure detecting device is operatively associated with an LED array, and includes a driving circuit and a determining circuit. The driving circuit is used to be coupled to scan lines and data lines of the LED array, and drives, based on a first control input corresponding to selection of one of LED units of the LED array, the LED units in such a way that a current flows through said one of the LED units. The determining circuit generates, based at least on the voltages respectively at the data lines and on a second control input corresponding at least to selection of the data line that is coupled to said one of the LED units, a determination output that indicates whether said one of the LED units is determined to have failed.
Claims16
A light emitting diode (LED) failure detecting device operatively associated with an LED array, the LED array including a plurality of scan lines, a plurality of data lines, and a plurality of LED units that are arranged in a matrix with a plurality of rows and a plurality of columns, each of the LED units having a first terminal and a second terminal, and permitting current flow therethrough from the first terminal thereof to the second terminal thereof;
- for each of the rows of the LED units, the first terminals of the LED units being coupled to a respective one of the scan lines;
- for each of the columns of the LED units, the second terminals of the LED units being coupled to a respective one of the data lines;
- said LED failure detecting device comprising:
- a driving circuit used to he coupled to the scan lines and the data lines, receiving a first control input that corresponds to selection of one of the LED units, and driving the LED units based on the first control input in such a way that a current flows through said one of the LED units;
- and
- a determining circuit used to be coupled to the data lines for receiving a plurality of first voltages respectively thereat, and further receiving a second control input that at least corresponds to selection of one of the data lines which is coupled to said one of the LED units, said determining circuit generating, based at least on the first voltages and the second control input, a determination output that indicates whether said one of the LED units is determined to have failed.
A light emitting diode (LED) failure detecting device operatively associated with an LED unit, the LED unit having a first terminal and a second terminal, and permitting current flow therethrough from the first terminal thereof to the second terminal thereof, said LED failure detecting device comprising:
- a driving circuit used to be coupled to the second terminal of the LED unit, receiving a control input, and driving the LED unit based on the control input in such a way that a current flows through the LED unit;
- and
- a determining circuit including
- a subtractor used to be coupled to the second terminal of the LED unit for receiving a first voltage thereat, used to further receive a second voltage, and obtaining a difference between the first and second voltages to generate a difference voltage, and
- a comparing module coupled to said subtractor for receiving the difference voltage therefrom, used to further receive a predetermined first threshold voltage and a predetermined second threshold voltage, and comparing the difference voltage with the predetermined first and second threshold voltages to generate a determination output that indicates whether the LED unit is determined to have failed.
A light emitting diode (LED) failure detecting device operatively associated with an LED unit, the LED unit including a first terminal, a second terminal, and a plurality of LEDs that are coupled in series between the first and second terminals of the LED unit, the LED unit permitting current flow from the first terminal thereof through the LEDs thereof to the second terminal thereof, said LED failure detecting device comprising:
- a driving circuit used to be coupled to the second terminal of the LED unit, receiving a control input, and driving the LED unit based on the control input in such a way that a current flows through the LED unit;
- and
- a determining circuit used to be coupled to the LEDs, generating a plurality of difference voltages that respectively correspond to respective voltages across the LEDs, and generating, based on the difference voltages, a determination output that indicates whether each of the LEDs is determined to have failed.
Dependencies are inferred from the claim text.