Patent ID: 11900865
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 8:
9. A light-emitting diode (LED) driving circuit for driving a backlight unit comprising a plurality of LED channels, the LED driving circuit comprising:
a current source configured to generate a reference current; and
a plurality of channel driving circuits configured to sequentially sample the reference current received from the current source, and generate output current,
wherein each of the plurality of channel driving circuits comprises
a switch-capacitor amplifier circuit configured to sample the reference current and amplify an input voltage corresponding to an input current, the switch-capacitor amplifier circuit including,
an amplifier including a first input end and a second input end,
a first capacitor having an end connected to the first input end of the amplifier, the first capacitor configured to store the input voltage, and
a second capacitor having a first end connected to the second input end of the amplifier,

an output circuit configured to generate output current according to an output voltage of the switch-capacitor amplifier circuit in response to a dimming control signal, and provide the output current to LED elements, and
a replica circuit connected to the switch-capacitor amplifier circuit to define a feedback loop when the output circuit is in an off state.