| 摘要 |
In a drive circuit for driving a liquid crystal display, a video signal generating block for generating a video signal to be supplied to a display panel, includes, for each of R (red), G (green) and B (blue), and coupled in the named order, a ADC circuit for analog-to-digital converting a video signal, two memories each having a capacity which can hold signals of one line of the display panel, a V-T compensation circuit for compensating a non-linearity of a transparent light strength to an input voltage of the display panel, a polarity inverting circuit for an AC driving of liquid crystal pixels in the display panel, a DAC circuit for digital-to-analog converting the digital signal outputted from the polarity inverting circuit, and an output selection circuit for supplying a precharge voltage to the display panel. The output selection circuit displays the analog signal outputted from the DAC circuit, during a period which is a half of one horizontal period of the video signal, and precharges the display panel during a latter half of the horizontal period. With this arrangement, a precharge circuit can be eliminated from the liquid crystal display panel, and the size of the panel can be reduced. In addition, a variation in the precharging in the display panel can be eliminated, and an uniform image can be displayed over the whole of the panel. Furthermore, the yield of production can be elevated as a whole.
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