公开(公告)号：US11847982B1

公开(公告)日：2023-12-19

申请号：US18228007

申请日：2023-07-31

Applicant: X-SIGNAL INTEGRATED CO., LTD.

Inventor： Guanou Yang ,  Huijiao Jin

IPC: G09G3/34 ,  G09G3/3283 ,  H05B45/325 ,  H05B45/14

CPC classification number: G09G3/3406 ,  G09G2330/045

Abstract: A backlight LED driver circuit with current regulating function is provided. The backlight LED driver circuit includes: a LED light-emitting element, a first transistor, a first amplifier, a current regulator module, and a voltage regulator module; the current regulator module including a plurality of current channels, each including one second transistor and one third transistor; the voltage regulator module including a fourth transistor, a fifth transistor, and a sixth transistor; the fourth transistor, the fifth transistor, and the sixth transistor in the voltage regulator module and the second transistor and one third transistor of each of the current channels in the current regulator module constitute a current mirror; and the current regulator module further including a decoder configured to generate a signal for controlling on and off states of the plurality of second transistors in the plurality of current channels in response to an input digital control signal.

公开(公告)号：US12236904B2

公开(公告)日：2025-02-25

申请号：US18743176

申请日：2024-06-14

Applicant: X-SIGNAL INTEGRATED CO., LTD.

Inventor： Guanou Yang ,  Huijiao Jin

IPC: G09G3/34 ,  G01R19/25

Abstract: An LED backlight driving circuit with a voltage regulating unit is provided. The LED backlight driving circuit includes a power supply unit, an LED string, an ADC voltage detection circuit, and a driving controller; the ADC voltage detection circuit is used to detect a voltage value Vled of a negative terminal of a LED string, and the ADC voltage detection circuit includes an ADC sampling module that converts the measured voltage value Vled at the negative terminal of the LED string into a voltage numerical code; for the numerical code of the negative terminal voltage value Vled measured by the ADC sampling module, a first threshold V1 and a second threshold V2 are set.