A light emitting diode in order to set the operating mode of the drive control apparatus for a number of control signals to the external input mode selector and the control data memory is input is input through the next to the video data shift register is stored in the video data memory, the stored data will LED It executes a vertical line driver for the dot-matrix panel.; The shift register is the duty to be driven, in accordance with a control data input to the control data according to the control data stored in a memory and can optionally set the number of bits of the input data, the external input mode selector of the input signal and the control data memory It can cause the read address corresponding to the ratio.; Therefore, reducing the number of input terminals of the drive control device can vary the magnitude of the input data, it is possible to vary the duty ratio of the display panel.
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