Method of automatically selecting a BNC/D-sub signal in display device having a display power management signaling function

摘要

Provided with a method of and circuit for automatically selecting a signal without using a separate signal selecting switch and for displaying the content of the signal by way of OSD (On Screen Display), the circuit including: a D-sub connector for transmitting a D-sub synchronous signal applied from a D-sub signal cable; a BNC connector for transmitting video signals and synchronous signals applied from a computer via a BNC signal cable; a selector for selecting one of the signals applied from the two connectors in response to a switching signal; and a microcomputer receptive to the BNC/D-sub signal transferred from the selector, and sending a control signal for selecting the BNC/D-sub signal to the selector according to the presence of the synchronous signals and DPMS state.