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US 7,768,217 B2Granted
Circuit and method for reducing east-west geometry mismatch between the top and bottom of a raster display
AssigneeZilog, Inc.
InventorAnatoliy V. Tsyrganovich
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Abstract
The present disclosure describes a technique for reducing east-west geometry mismatch between the top and bottom of a raster display. This is accomplished by generating a horizontal correction signal that does not have any discontinuities. Since there are no discontinuities in the horizontal correction signal, the horizontal deflection current signal will not be distorted. As a result, there will be no east-west geometry mismatch between the top and bottom of the raster display.
Claims20
A method, comprising:
- generating a sawtooth signal, wherein the sawtooth signal has an amplitude;
- generating a correction signal with no discontinuities, wherein the correction signal has a vertical retrace time tVR and a vertical active time tVA;
- modulating the amplitude of the sawtooth signal using the correction signal to generate a deflection signal;
- and
- amplifying the deflection signal to generate a deflection current signal, wherein the deflection current signal is not distorted when the correction signal transitions from the vertical retrace time tVR to the vertical active time tVA.
2 more elements
A method, comprising:
- generating a sawtooth signal, wherein the sawtooth signal has an amplitude;
- generating a correction signal with no discontinuities, wherein the correction signal has a vertical retrace time tVR and a vertical active time tVA;
- modulating the amplitude of the sawtooth signal using the correction signal to generate a deflection signal;
- and
- amplifying the deflection signal to generate a deflection current signal, wherein the deflection current signal is not distorted when the correction signal transitions from the vertical retrace time tVR to the vertical active time tVA, wherein the generating the correction signal is performed by combining a first correction signal component with a second correction signal component.
2 more elements
A horizontal deflection generator, comprising:
- a circuit that generates a horizontal sawtooth signal having an amplitude;
- and
- means for modulating the amplitude of the horizontal sawtooth signal using a horizontal correction signal to generate a horizontal deflection current signal, wherein the horizontal correction signal has no discontinuities, wherein the horizontal correction signal has a vertical active time tVA and a vertical retrace time tVR, and wherein the horizontal deflection current signal is not distorted after a transition from the vertical retrace time tVR to the vertical active time tVA.
A horizontal deflection generator, comprising:
- a circuit that generates a horizontal sawtooth signal having an amplitude;
- and
- means for modulating the amplitude of the horizontal sawtooth signal using a horizontal correction signal to generate a horizontal deflection current signal, wherein the horizontal correction signal does not have any discontinuities.
Dependencies are inferred from the claim text.