Do you know which parts of the LCD TV circuit is mainly composed of ah?

A liquid crystal display circuit comprising a direct current power supply, a pulse width modulation circuit, an inverter circuit, a number of lamps, a number of overvoltage protection circuits, a voltage feedback sensing circuit, a current feedback sensing circuit, and a bi-directional conduction circuit. Said pulse width modulation circuit, connected to two transistors, outputs two pulses to make said transistors conduct alternately. Said lamps are connected in series to said inverter circuit and each overvoltage protection circuit is connected to a lamp to detect an output voltage applied to such lamps; said bi-directional conduction circuit is connected between such lamps and is connected to said current feedback sensing circuit so that when any of said lamps is open-circuited, the voltage at the forward input of said current feedback sensing circuit is below a reference voltage and said pulse width modulation circuit turns off the output. modulation circuit turns off the output.