Driving circuit for LED backlight, LCD device, and method for manufacturing driving circuit for LED backlight

摘要

The driving circuit for a light emitting diode (LED) backlight includes at least two lightbars arranged in parallel connection. An output end of each of the LED lightbars is coupled with a converter module, and the converter module is configured with a digital potentiometer balancing a voltage difference between the LED lightbars and adjusting a resistance by an electric signal. In the present disclosure, the digital potentiometer adjusting the resistance by the electric signal is arranged in the converter module connected with the LED lightbar in series, and the resistance of the digital potentiometer is dynamically adjusted according to the resistance of different LED lightbars during use. Thus, the total voltage of each LED lightbar and the digital potentiometer connected with the LED lightbar in series is constant.

主权项

1. A driving circuit for a light emitting diode (LED) backlight, comprising:
at least two lightbars arranged in parallel connection; wherein an output end of each LED lightbar is coupled with a converter module, and the converter module is configured with a digital potentiometer for balancing a voltage difference between the LED lightbars and adjusting a resistance by an electric signal; wherein the converter module comprises a control chip; one end of each digital potentiometer is coupled to the output end of one LED lightbar in series, and the other end is coupled to the control chip in series.