Drive circuits for a high resolutions cathode ray tube display
AssigneeCPT Corporation
InventorFrederick D. Lehman
Life of this patent
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Abstract
A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drives vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.
Claims6
In a cathode ray tube display circuit having a high frequency two-way scan circuit, a high frequency video circuit and a vertical yoke, a drive circuit for vertical scanning comprising:
- receiving means for receiving an input sync pulse for vertical retrace;
- means for generating a linear ramp signal after the input signal has been received, the ramp generating means comprising an energy source and energy storage means connected to the energy source for accumulating energy to generate the ramp signal;
- solid state shaping means for shaping the linear ramp to compensate for nonlinearities due to the surface of the tube;
- summing means connected to the ramp generating means and the shaping means for producing a vertical drive signal compensated for nonlinearities due to the surface of the tube;
- vertical retrace means for causing a retrace scan;
- output means connected to the yoke to drive the yoke according to the signal produced, the output means including means for decoupling high frequencies caused by the two-way scan circuit and video circuit;
- and
- wherein the receiving means comprises timing means for generating a finite time interval during which the energy accumulated by the energy storage means is dissipated and wherein the drive signal produced by the ramp generating means and the shaping means causes a trace scan to occur and wherein the means for causing a retrace scan comprises solid state components connected to the summing means and the vertical yoke of the tube for generating a retrace scan signal after the energy has been dissipated from the energy storage means.
Dependencies are inferred from the claim text.