LED Driving Device and LED Driving Method
AssigneeSilicon Works Co., Ltd.
InventorsJi Hwan Kim, Jong Min Lee
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Abstract
The present disclosure relates to a technology for driving an LED, comprising sensing a forward-direction voltage of an LED and determining whether or not the LED is defective by comparing the forward-direction voltage with a comparative object voltage, wherein the comparative object voltage is continuously updated using a sensed forward-direction voltage so that the comparative object voltage may be set to be an unfixed value, that is, a value reflecting a current state of an LED. This allows a more accurate detection of a defect of an LED.
Claims15
A light emitting diode (LED) driving device, comprising:
- a driving circuit to drive a plurality of LEDs respectively in different times according to scan signals;
- and
- a protection circuit to sense a first voltage corresponding to a forward-direction voltage of a first LED among the plurality of LEDs in a first time, to sense a second voltage corresponding to a forward-direction voltage of a second LED among the plurality of LEDs in a second time, and to determine a state of the second LED using the first voltage and the second voltage.
An LED driving device comprising:
- a driving circuit to sequentially drive a plurality of pixels, each comprising an LED, by scan line;
- and
- a protection circuit to sense a voltage formed in a position of each pixel as a first voltage, to sense a highest voltage among first voltages for pixels as a second voltage via a path in which a voltage drop element is disposed, and to determine a state of each pixel by comparing the first voltage and the second voltage.
An LED driving method, comprising:
- driving a plurality of LEDs respectively in different times using a channel;
- sensing a forward-direction voltage of each LED using the channel in every driving time;
- storing a comparative object voltage and, when the forward-direction voltage in one driving time is higher than the comparative object voltage by at least a predetermined voltage, updating the comparative object voltage using a voltage obtained by deducting the predetermined voltage from the forward-direction voltage in the one driving time;
- and
- comparing the forward-direction voltage with the comparative object voltage to determine a state of the LED.
Dependencies are inferred from the claim text.