Patent ID: 6819114
Filing Date: 2004-11-16
Classification: G06F,G09G,Y10S

Abstract:
A monitor comprising:a display panel for displaying video images; a displaying circuit for transforming video signals transmitted from a computer into a video image and displaying the video image on the display panel; a connector electrically connected to an input port of the displaying circuit far receiving the video signals transmitted from the computer; and a self testing circuit electrically connected to the input port of the displaying circuit, the self testing circuit comprising: a testing signal generator for generating a testing signal to test the monitor, the testing signal generator generating the testing signal from an H-BLANK signal such that the testing signal and the H-BLANK signal have substantially similar duty cycles, wherein the testing signal generator transmits the testing signal to the displaying circuit, and the displaying circuit transforms the testing signal into a testing image and displays the testing image on the display panel; a switch circuit electrically connected between an output port of the testing signal generator and the input port of the displaying circuit, for controlling output of the testing signal; and a detecting circuit electrically connected to a controlling port of the switch circuit for detecting whether signals are transmitted from the computer so as to control on/off states of the switch circuit; wherein when the detecting circuit detects the video signals transmitted from the computer, the detecting circuit switches off the switch circuit so as to avoid the testing signal generated from the testing signal generator being transmitted to the input port of the displaying circuit, and when no video signals transmitted from the computer are detected, the detecting circuit switches on the switch circuit so as to allow the testing signal generated from the testing signal generator to be transmitted to the displaying circuit.