| 摘要 |
<p>PURPOSE:To always impress an optimum voltage to liquid crystal by providing biases respectively optimumly adjusted even in the case of inputting signals at various frame frequencies. CONSTITUTION:The frequency of the inputted signal is discriminated by a frame frequency discrimination circuit 1, the result is inputted to a multiplexer 2 in the next step and corresponding to the inputted frequency, the voltage is selected. When there are three kinds of voltages, the respective voltages are optimumly adjusted corresponding to the input signals at the respective frame frequencies so as not to load DC to the liquid crystal. The output of this multiplexer 2 is operated as the DC bias of a common electrode voltage and impressed to the common electrode of a TFT liquid crystal display device.</p> |
