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US 11,889,599 B2Granted
Constant current driving device, current trimming method thereof, and LED driving device
AssigneeLx Semicon Co., Ltd.
InventorsJi Hwan Kim, Jang Su Kim
Life of this patent
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Abstract
The present disclosure provides a technology for precisely controlling an LED driving current using fine current trimming data stored in a memory when driving an LED.
Claims20
A constant current driving device comprising:
- a reference current source configured to supply a reference current;
- a memory configured to store fine current trimming data determined by a difference between a target current and an output current before trimming through a memory access signal;
- and
- a current control circuit configured to be controlled through a circuit control signal, to generate an output current corresponding to the reference current, and to supply to a channel an output current trimmed based on the fine current trimming data stored in the memory.
1 more element
A fine current trimming method of a constant current driving device, comprising:
- loading fine current trimming data stored in a memory to a current control circuit;
- measuring an output current output to a channel based on the fine current trimming data;
- determining whether the output current is equal to a target current;
- and
- writing fine current trimming data determined by a difference between the target current and the output current in the memory if the output current is not equal to the target current.
2 more elements
A light emitting diode (LED) driving device comprising:
- a reference current source configured to supply a reference current;
- a memory configured to store fine current trimming data determined by a difference between a target current and an output current before trimming;
- and
- a current control circuit configured to generate an output current corresponding to the reference current and to supply an output current, trimmed based on the fine current trimming data stored in the memory, to a channel in which a light emitting diode (LED) is disposed.
1 more element
Dependencies are inferred from the claim text.