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

Claim 13:
14. A backlight device comprising:
a backlight unit (BLU) comprising a plurality of dimming groups;
a plurality of pixel circuits each configured to drive a corresponding one of the plurality of dimming groups, each of the plurality of pixel circuits comprising a plurality of channel driving circuits configured to provide a plurality of output currents to a plurality of light-emitting diode (LED) channels included in the corresponding one of the plurality of dimming groups; and
a pixel driving circuit configured to provide a reference current to the plurality of pixel circuits,
wherein each of the plurality of channel driving circuits comprises
a switch-capacitor amplifier circuit configured to sample the reference current in a first period,
a replica circuit configured to define a feedback loop with the switch-capacitor amplifier circuit in the first period, the replica circuit including a transistor and a resistor connected to the transistor, the transistor configured to operate based on an output of the switch-capacitor amplifier circuit in the first period, and
an output circuit including a driving transistor and an output resistor connected to the driving transistor, the driving transistor configured to generate at least one of the plurality of output currents according to an output voltage of the switch-capacitor amplifier circuit in a second period consecutive to the first period, and the output resistor configured to receive the at least one of the plurality of output currents.