Dynamic pixel diagnostics for a high refresh rate LED array
AssigneeLumileds LLC
InventorRonald Bonne
Life of this patent
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Abstract
A LED controller for an LED pixel array includes a switch K1 activated in response to a row and column select signal; a switch K2 activated in response to a pulse width modulation duty cycle; and a switch K3 providing a current source from Vbias. Pixel activation is determined at least in part by state of switch K1 and K2. In operation, the LED pixel in the LED pixel array is selected by switch K1 and a fault determination for the LED pixel is made based on determined Vf on a Vf bus.
Claims20
A light emitting diode (LED) controller for an LED pixel array, comprising:
- a first switch activated in response to a row and column select signal;
- a second switch activated in response to a pulse width modulation duty cycle;
- and
- a third switch for providing a current source from a bias voltage, pixel activation determined at least in part by a state of the first switch and the second switch, a LED pixel in the LED pixel array selected by the first switch, and a fault determination for the LED pixel made based on a determined forward voltage on a forward voltage bus.
A light emitting diode (LED) controller for an LED pixel array, comprising:
- logic for providing a row and column select signal;
- a pulse width modulator having a duty cycle;
- a pulse width modulation (PWM) switch activated based on the duty cycle, the PWM switch having a first terminal and a second terminal, the first terminal of the PWM switch connected to power;
- a regulation switch having a gate, a first terminal, and a second terminal, the first terminal of the regulation switch connected to power, the gate of the regulation switch connected to the second terminal of the PWM switch;
- and
- a LED pixel in the LED pixel array that is activated at least in part according to a state of the row and column select signal and the regulation switch, wherein a fault determination for the LED pixel made based on a determined forward voltage on a forward voltage bus.
A light emitting diode (LED) controller for an LED pixel array, comprising:
- a first switch for being activated in response to row and column select signals;
- a pulse width modulator that receives image data and generates a pulse width modulation signal having a duty cycle;
- a second switch for being activated in response to the duty cycle;
- and
- a third switch for providing a current source to an LED pixel in the LED pixel array, the third switch controlled by a bias voltage, the pixel activation determined at least in part by a state of the first switch and the second switch, the first switch configured to select the LED pixel in the LED pixel array, and
- the first switch having a first terminal connected to a forward voltage bus and a second terminal connected to the LED pixel in the LED pixel array.
Dependencies are inferred from the claim text.