| 摘要 |
<p>PURPOSE: To provide a multi-gradation thin film transistor TR liquid crystal display device (TFT/LCD) which doesn't increase the chip area and has a driver consisting of a small number of circuit elements. CONSTITUTION: A driver IC which drives data lines of a TFT/LCD panel is provided with power sources, which have reference potentials Va and Vb corresponding to at least two different gradations, and switches SWa and SWb , which selectively supply their potentials to data lines. When the output potential corresponding to an arbitrary gradation between prescribed gradations is denoted as Vc , these switches are alternately switched with a prescribed period in a ratio where the potential Vc proportionally divides potentials Va and Vb , thereby outputting the potential Vc to data lines. Consequently, a ratio of switching of two switches is only properly changed to obtain the output potential corresponding to the arbitrary gradation between prescribed gradations.</p> |
