| 摘要 |
<p>Disclosed is a driver circuit, as well as a LCD device having the driver circuit, in which changeover between first and second buffer circuits the operating ranges of which extend to high- and low-potential power supply voltages can be performed reliably within the drive changeover range. The driver circuit includes first and second buffer circuits(13 and 14) having their input terminals connected in common with one input terminal(1) to which an input signal voltage(Vin) is input and having their output terminals connected in common with an output terminal(2), the first and second buffer circuits having operating ranges that extend to high- and low-potential power supply voltages, respectively; first and second storage units(3a and 3b) for storing respectively positive- and negative-polarity reference data, which correspond to voltages within a range in which both of the first and second buffer circuits(13 and 14) are operable, with regard to each of a standard state and modulated state of a gamma characteristic; a selector(4) for selecting either of the storage units based upon a polarity signal, and selectively outputting reference data corresponding to the standard or modulated state based upon modulation information that specifies modulation; and a comparator(5) for comparing entered data and the reference data output from the selector. Activation and deactivation of the first and second buffer circuits(13 and 14) is controlled based upon an output signal from the comparator(5) and a control signal.</p> |
