Display circuit which automatically deciphers different video formats and optimizes the horizontal and vertical centering of the image on the display

A display device deciphering various video formats and optimizing horizontal and vertical image centering on a display screen, said display device comprising:

• a controller connected to a source of incoming video signals for determining a standard of said incoming video signals and supplying adjustment information based on said standard
• a timing generator receiving said adjustment from said controller and a synchronizing signal, said timing generator generating a first and second timing signals in accordance with said adjustment information,
• said timing generator comprising:
• a frequency demultiplier which receives said adjustment information,
• a phase comparator which receives said synchronizing signal and a signal output from said frequency demultiplier,
• a low pass filter connected to an output of said phase comparator,
• a voltage controlled oscillator which receives an output signal from said low pass filter and which controls said frequency demultiplier, and
• vertical and horizontal clock generating circuits generating said first and second timing signals respectively, said horizontal clock generating circuit receiving said adjustment information and being controlled by said voltage controlled oscillator, said vertical clock generating circuit receiving said adjustment information and being controlled by said horizontal clock generating circuit;
• and
• a display panel comprising pixels arranged in a matrix, a vertical scanning circuit operable in response to said first timing signal for sequentially selecting respective pixel rows, and a horizontal scanning circuit operable in response to said second timing signal for controlling video signals supplied to selected pixel rows in accordance with said standard, to display the optimally-adjusted image.