Multisystem television which is usable as a monitor of a personal computer and a method thereof

A method of displaying PC signal data from a PC on a television having a picture tube, comprising:

• determining horizontal and vertical frequencies of horizontal and vertical synchronizing signals of the PC signal by counting the horizontal and vertical synchronization signals;
• determining deflection control data of the picture tube based upon the counted horizontal and vertical frequencies;
• and
• transmitting the deflection control data to the picture tube.

A television to display a PC (personal computer) signal from a personal computer and an other signal from a non-PC source, comprising:

• a switch to selectively enable transmission of the PC signal and the other signal, according to a current viewing mode;
• a video output circuit to process the one selected signal from said switch;
• and
• a controller to determine deflection control data based on counting horizontal and vertical frequencies of a synchronizing signal associated with the PC signal if the PC signal is the one selected signal, and to determine the deflection control data as a fixed value if the other signal is the one selected signal.

A television having a picture tube and usable as a monitor for a personal computer, the personal computer having a first output signal set including a video signal, a horizontal sync signal and a vertical sync signal, the television comprising:

• a radio frequency receiver which receives a television signal and outputs a second signal set including a video signal, a horizontal sync signal and a vertical sync signal;
• a circuit which selects one of the first and second signal sets, outputs the selected video signal and outputs the horizontal and vertical sync signals corresponding to the selected video signal;
• a video output circuit which adjusts the picture quality of the selected video signal in response to a quality control signal;
• and
• a controller which:
• counts the outputted horizontal and vertical sync signals and outputs a first deflection control signal based on the counts of the outputted vertical and horizontal sync signals and a first stored value in response to the selection of the first signal set, or outputs a second deflection control signal based on a second stored value in response to the selection of the second signal set;
• and
• outputs the quality control signal to the video output circuit based on the selected signal set.