Patent ID: 6529190
Filing Date: 2003-03-04
Classification: G09G

Abstract:
A method comprising:detecting a voltage for each of a plurality of power supply lines in a display device, the power supply lines being direct current lines; converting each voltage for the plurality of power supply lines into a digital voltage value; periodically monitoring each digital voltage value; comparing each digital voltage value with a predetermined high voltage threshold for the respective power supply line and with a predetermined low voltage threshold for the respective power supply line, the high voltage threshold corresponding to an over-voltage condition for the display device and the low voltage threshold corresponding to a line shortage condition for the display device; and shutting down a power supply supplying power to the plurality of power supply lines if: the digital voltage value for any of the plurality of power supply lines is above the high voltage threshold for the respective power supply line for a first predetermined period of time; or the digital voltage value for any of the plurality of power supply lines is below the low voltage threshold for the respective power supply line for a second predetermined period of time.