Multiple power supply circuit for led array
AssigneeLumileds LLC
InventorsZhi Hua Song, Ronald Johannes Bonne
Life of this patent
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Abstract
A power supply system for a LED pixel array includes at least two power supplies respectively connectable to sub-arrays in a LED pixel array and providing adjustable power. A controller is connected to the at least two power supplies, with the controller able to make adjustments to the power supplied based on measured requirements of sub-arrays in the LED pixel array. In one embodiment, the LED pixel array is a microLED array.
Claims20
A power supply system for a light emitting diode (LED) pixel array, comprising:
- at least two power supplies respectively configured to provide adjustable electrical power to respective LED pixel sub-arrays of LED pixels in the LED pixel array, each of the LED pixels including a current source and an LED;
- and
- a controller for the at least two power supplies, the controller configured to:
- measure forward voltage of respective LED pixels of an LED pixel sub-array of the LED pixel sub-arrays, and adjust the electrical power provided by the at least two power supplies based on measured forward voltage of respective LED pixels of the LED pixel sub-arrays.
A micro light emitting diode (LED) pixel array system, comprising:
- a plurality of microLED pixels arranged into independently powered sub-arrays, each of the microLED pixels including a current source and an LED;
- at least two power supplies respectively connected to an LED pixel sub-array of the LED pixel sub-arrays and configured to provide adjustable electrical power to the LED pixel sub-array;
- and
- a controller for the at least two power supplies, the controller configured to:
- measure an electrical property of respective LED pixels of an LED pixel sub-array of the LED pixel sub-arrays, and
- adjust electrical power provided by the at least two power supplies based on the measured electrical property.
A control method for a light emitting diode (LED) array, comprising:
- providing a plurality of microLED pixels arranged to include at least two independently electrically powered, microLED pixel sub-arrays, each of the microLED pixel sub-arrays including distinct microLED pixels of the plurality of microLED pixels, each of the LED pixels including a current source and an LED;
- supplying, to each microLED pixel sub-array and from a respective, dedicated power supply, power based on forward voltage shift matching;
- measuring power usage and forward voltage shift for at least some of the plurality of microLED pixels of each of the microLED pixel sub-arrays;
- and
- dynamically adjusting electrical power supplied to the independently powered microLED pixel sub-arrays based on the measured power and the forward voltage shift.
Dependencies are inferred from the claim text.