| 摘要 |
<p>A first waveform generator (14) performs waveform generation based on the result of comparison of an analog FB signal (switching signal) with a first reference potential by a first comparator (12). A second waveform generator (18) performs waveform generation based on the result of comparison of the analog FB signal with a second reference potential by a second comparator (16). The outputs of the first and second waveform generators (14, 18) are input to an averaging unit (19), whereby the slope of a waveform of the switching signal is reflected on the output of the averaging unit (19). As a result, a process of gradually changing a border between a main image and a sub-image can be performed, whereby a disturbance can be reduced or eliminated at the border. Moreover, the circuit size can be reduced.</p> |
