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US 6,208,093 B1Granted
Selectable clampers for an S-shaping voltage of a video display
AssigneeThomson Licensing
InventorWalter Truskalo
Life of this patent
Estimating the term…
Abstract
In a horizontal deflection circuit output stage of a video display monitor capable of operating at multi-scan rates, a given S-capacitor, selected from a bank of S-capacitors, provide S-correction at a corresponding range of frequencies. A resistor-capacitor-diode clamp selected from a bank of clamps is coupled to the selected S-capacitor for reducing ringing by causing critical damping. The in-circuit selected resistor-capacitor-diode clamp is selectable, in accordance with the selected horizontal deflection frequency.
Claims4
A video display deflection apparatus operating at multi-scan horizontal frequencies, comprising:
- a source of an input signal at a frequency related to a selected horizontal deflection frequency;
- a first switch, responsive to said input signal and coupled to a horizontal deflection winding and to a retrace capacitance, for generating a horizontal deflection current in said horizontal deflection winding at the selected horizontal deflection frequency, said horizontal deflection winding being coupled to an S-shaping capacitance for generating an S-shaping voltage that provides horizontal linearity distortion correction;
- a first clamp circuit selectable in accordance with the selected horizontal deflection frequency for clamping said S-shaping voltage, during a portion of a horizontal period;
- and
- a second switch responsive to said input signal and coupled to said first clamp circuit for selecting said first clamp circuit, when the selected horizontal deflection frequency is within a first range, and for de-selecting said first clamp circuit, when the selected horizontal deflection frequency is within a second range.
2 more elements
Dependencies are inferred from the claim text.