Dynamic focus regulation circuit of display apparatus

A horizontal dynamic focus regulation circuit of an S-regulation circuit, which induces a horizontal dynamic focus waveform voltage by a horizontal deflection circuit generating a different frequency according to a horizontal frequency of a display mode of a display apparatus, the horizontal dynamic focus regulation circuit comprising:

• a microcomputer outputting a plurality of control signals;
• first, second and third switching transistors each being separately responsive to respective ones of said control signals, according to said display mode;
• first, second and third dynamic S-regulation capacitors connected at respective first, second and third nodes in series with said first, second and third switching transistors, respectively, said first, second and third dynamic S-regulation capacitors each being coupled in parallel with a basic S-regulation capacitor of said S-regulation circuit when the respective first, second and third switching transistors are turned on;
• first, second and third auxiliary capacitors connected to one side of respective ones of said first, second and third switching transistors at said first, second and third nodes, respectively, each of said first, second and third auxiliary capacitors being commonly connected to a dynamic focus capacitor of a dynamic focus output circuit connected in parallel with said S-regulation circuit;
• said first dynamic S-regulation capacitor, said first auxiliary capacitor and said dynamic focus capacitor being connected in series to another side of said first switching transistor and being connected in parallel to said basic S-regulation capacitor when said first switching transistor is turned off;
• said second dynamic S-regulation capacitor, said second auxiliary capacitor and said dynamic focus capacitor being connected in series to another side of said second switching transistor and being connected in parallel to said basic S-regulation capacitor when said second switching transistor is turned off;
• and
• said third dynamic S-regulation capacitor, said third auxiliary capacitor and said dynamic focus capacitor being connected in series to another side of said third switching transistor and being connected in parallel to said basic S-regulation capacitor when said third switching transistor is turned off.