Abstract The present invention relates to a multi-frequency displaying device for displaying both TV and PC video signals. The displaying device comprises a displaying screen for displaying TV or PC video signals, a video signal processing circuit for converting the TV video signals into TV RGB signals and TV sync signals, a sync circuit for converting the TV sync signals or PC sync signals into vertical and horizontal deflection signals, and a display control circuit for displaying the TV RGB signals or PC RGB signals in the display screen in synchronization with the vertical and horizontal deflection signals. The sync circuit comprises a multi-frequency horizontal oscillator for generating clock signals to convert the TV sync signals or PC sync signals with different frequencies into the horizontal deflection signals according to the switch.
A displaying device having a displaying screen for displaying TV (television) video signals or PC (personal computer) video signals having PC RGB signals and PC sync signals according to a switch for selecting the TV or PC video signals comprising: (1) a video signal processing circuit for converting the TV video signals into TV RGB signals and TV sync signals; (2) a sync circuit for converting the TV sync signals or PC sync signals into vertical and horizontal deflection signals according to the switch; said sync circuit comprising a multi-frequency horizontal oscillator for generating clock signals to convert the TV sync signals or PC sync signals with different frequencies into the horizontal deflection signals according to the switch; and (3) a display control circuit for displaying the TV RGB signals or PC RGB signals in synchronization with the vertical and horizontal deflection signals in the display screen according to the switch; wherein the horizontal oscillator comprises a RC circuit with a variable resistor controlled by the switch to control the oscillation frequency of the horizontal oscillator.
Claim 2
Dependent Claim
176 words
A displaying device having a displaying screen for displaying TV (television) video signals or PC (personal computer) video signals having PC RGB signals and PC sync signals according to a switch for selecting the TV or PC video signals comprising: (1) a video signal processing circuit for converting the TV video signals into TV RGB signals and TV sync signals; (2) a sync circuit for converting the TV sync signals or PC sync signals into vertical and horizontal deflection signals according to the switch; said sync circuit comprising a multi-frequency horizontal oscillator for generating clock signals to convert the TV sync signals or PC sync signals with different frequencies into the horizontal deflection signals according to the switch; and (3) a display control circuit for displaying the TV RGB signals or PC RGB signals in synchronization with the vertical and horizontal deflection signals in the display screen according to the switch; wherein the horizontal oscillator comprises a RC circuit with a variable resistor controlled by the switch to control the oscillation frequency of the horizontal oscillator.