Abstract: A brightness control device includes a back light panel, a controller, and an image signal processing chip. The back light panel includes a blue light LED module and a green light LED module. The controller includes a converting module and a sub-control module. The image signal processing chip includes a main control module and a storing module. The storing module stores first corresponding data and second corresponding data. The main control module sends two initial pulse signals corresponding to a brightness of the two light LED modules to the converting module. The converting module converts the two initial pulse signals into direct current signals and sends the direct current signals to the sub-control module. The sub-control module sends a first drive current signal and a second drive current signal to the blue light LED module and the green light LED module.

Abstract: An exemplary balance controlling circuit (100) includes a transformer (T11), a first capacitor (C11), a second capacitor (C22), a first inductor (TC11), and a second inductor (TC12). The transformer includes two inputs (41, 42) connected to an external circuit, a grounded first output (43) and a second output (44). The second capacitor (C12) includes a first port (121) configured to connect to ground, and a second port (122) connected to the second output of the transformer. The first capacitor (C11) includes a second port (112) connected to the second output of the transformer, and a first port (111) connected to the first inductor and the second inductor. The first inductor includes a first output port (I1). The second inductor includes a second output port (I2), and a third output port (I3).

Abstract: An exemplary balance controlling circuit (100) includes a transformer (T11), a first capacitor (C11), a second capacitor (C22), a first inductor (TC11), and a second inductor (TC12). The transformer includes two inputs (41, 42) connected to an external circuit, a grounded first output (43) and a second output (44). The second capacitor (C12) includes a first port (121) configured to connect to ground, and a second port (122) connected to the second output of the transformer. The first capacitor (C11) includes a second port (112) connected to the second output of the transformer, and a first port (111) connected to the first inductor and the second inductor. The first inductor includes a first output port (I1). The second inductor includes a second output port (I2), and a third output port (I3).