FIELD: electrical engineering.
SUBSTANCE: LED lighting control circuit and liquid crystal display device with a resetting of the control frequency according to the magnitude of the operating current are declared. Circuit includes a buffer stage for converting the input voltage into an output voltage for a line of LEDs; current control module, connected to the negative terminal of the LED array and adjusting the operating current of the LED array; driver chip, feeding the buffer stage and the current control module, respectively, the first and second meanders; a current detection module that detects the operating current of the LED array to generate a detection signal; a pilot signal module for receiving a detection signal for generating a monitor signal; and a frequency adjustment module for receiving a monitor signal in order to generate a resistance. Frequency adjustment module is connected to the driver chip, and the driver chip adjusts the control frequency of the control circuit in accordance with the resistance. Liquid crystal display device using such control circuit is also provided.
EFFECT: technical result is to reduce energy consumption and improve the manageability of control schemes for such devices.
20 cl, 7 dwg
