| 摘要 |
PURPOSE: A driving drive module of an LED(Light Emitting Diode) sign board is provided to reduce the number of device by simplifying the structure of the driving drive module. CONSTITUTION: An input terminal(31) receives a latch signal, a red LED column selection signal, a green LED column selection signal, a clock signal(CLK), and a row selection signal encoded to four bit. A decoder unit(32) is comprised of a decoder for receiving the row selection signal from the input terminal(31) to decode it and a decoder disable circuit for controlling the decoder. A row selection circuit unit(33) is comprised of an FET(Field Effect Transistor) for amplifying the row selection signal received from the decoder unit(32). A red LED column selection circuit unit(34) amplifies the red LED column selection signal received from the input terminal(31). A green LED column selection circuit unit(35) amplifies the green LED column selection signal received from the green LED column selection signal. An output terminal(36) transmits to an LED sign board the row selection signal, the red LED column selection signal, and the green LED column selection signal outputted respectively from the row selection circuit unit(33), the red LED column selection circuit unit(34), the green LED column selection circuit unit(35). An input signal bypass unit(37) is comprised of a buffer and an output connector for temporarily storing the signals in order to transmit the latch signal, the red LED column selection signal, the green LED column selection signal, the clock signal(CLK), and the row selection signal encoded to four bit to an input terminal of another driving drive module. A power unit supplies power in order to drive active devices of the circuit.
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