| 摘要 |
In a signal line drive circuit of an active-matrix type liquid-crystal display which is a voltage-controlled type display with a capacitive load, n selector switches ( 161 to 16 n) are provided between buffer circuits ( 151 to 15 n) to which voltages responsive to an image to be displayed are inputted from reference voltage selection circuits ( 131 to 13 n), and output terminals (T 1 to Tn) to which are connected image signal lines. These selector switches ( 161 to 16 n), based on a shorting control signal (Csh) that is at a high level when the polarity is reversed to perform AC drive of the liquid-crystal panel, switch the output signals (OUT 1 to OUTn of the image signal line drive circuit between the output signals of the buffer circuits ( 151 to 15 n) and the common electrode signal (Vcom). By doing this, each of the image signal lines is, for a prescribed time only when the polarity is reversed, separated from the buffer circuits ( 151 to 15 n) and shorted to the common electrode. This configuration reduces the power consumption of the signal line drive circuit |
