摘要:
A backlight module that uniformly maintains the brightness of a light emitting device, in which the number of transformers is reduced, and that is applicable for use with large cold cathode ray tubes includes cold cathode ray tubes arranged in parallel, transformers having first secondary-side terminals connected to first electrodes of the cold cathode ray tubes and whose primary side terminals are connected in series to constitute a closed loop, a first inverter circuit that applies a first sine wave voltage to second terminals on the secondary sides of the transformers, and a second inverter circuit that applies a second sine wave voltage having opposite phase to second electrodes of the cold cathode ray tubes.
摘要:
A backlight assembly includes: a plurality of lamp units; and an inverter which includes a plurality of pattern capacitors, wherein each of the pattern capacitors is electrically connected to a respective one of the plurality of lamp units, wherein each of the pattern capacitors comprises a printed circuit board, and a conductive layer formed on one side of the printed circuit board, and at least one of the plurality of pattern capacitors has a different electric capacity than another of the pattern capacitors.
摘要:
A transformer and a liquid crystal display apparatus having the transformer are provided. The transformer includes a bobbin having at least one first winding section, at least one second winding section, and at least one core insertion groove formed therein. The transformer also includes at least one coil wound around the first winding section and the second winding section with at least one core inserted into the core insertion groove.
摘要:
A backlight unit includes; a light source, an inverter which provides the light source with an input voltage, and a printed circuit board (“PCB”) connected to the light source, wherein the PCB includes a protection circuit which detects an open-lamp-protection voltage which varies according to a change of the input voltage and changes a reference voltage according to the change of the input voltage, wherein the protection circuit turns off the inverter when the detected open-lamp-protection voltage is higher than the changed reference voltage.
摘要:
An inverter circuit includes plural pairs of third coils, in which adjacent third coils are serially connected to each other so as to offset AC voltage generated from the paired third coils, one end of the paired third coils being connected to ground. Input terminals of plural diodes are connected to one end of the paired third coils so as to generate the voltage detection value by detecting voltage generated from the paired third coils. A fault detector compares the voltage detection value generated from the diodes with a predetermined threshold value to detect a fault and generates the comparison result.