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Horizontal deflection circuit with paster correction

A technology of deflection circuit and deflection current, which is applied in the direction of TV, electrical components, TV system scanning details, etc., and can solve problems such as parallelogram error

Inactive Publication Date: 2003-01-29
THOMSON CONSUMER ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, while this solution eliminates the orthogonality error, it does not account for the parallelogram error component caused by the inconsistency of the pincushion correction current envelope with the pincushion curvature of the grating

Method used

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  • Horizontal deflection circuit with paster correction
  • Horizontal deflection circuit with paster correction
  • Horizontal deflection circuit with paster correction

Examples

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Embodiment Construction

[0028] FIG. 3 shows a generalized horizontal deflection circuit 100, the associated voltage and current waveforms of which are shown in FIG. It is stipulated here that the current flow direction shown in FIG. 3 is positive.

[0029] See Figures 3 and 4. A B+ voltage of approximately 140 volts DC is applied to both ends of the S correction capacitor CS through the primary winding LPRI of the high voltage transformer T1. When the electron beam is deflected to the upper left corner of the raster, the horizontal output transistor Q1 does not allow current to pass through. Energy previously stored in horizontal deflection coil LH causes current to flow through forward biased damper diode D1 and horizontal deflection coil LH into S correction capacitor CS. At this time both the damping current ID and the horizontal deflection current IH reach their peak negative values.

[0030] When the electron beam reaches the center of the raster, the energy stored in the horizontal deflectio...

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Abstract

Disclosed is a deflection circuit for the video display apparatus, including a deflection coil (LH) for producing grating, and a correcting current generating device (200) coupling with the deflection coil, so that the left transverse edge and the right transverse edge of the grating are basically orthogonalized with the horizontal axis of the geometric center of the grating, respectively.

Description

technical field [0001] This invention relates generally to the field of raster correction circuits and, more particularly, to a circuit for correcting orthogonality and parallelogram errors of cathode ray tube rasters for video display devices. Background technique [0002] The raster in a cathode ray tube (CRT) of a video display device is formed by deflecting at least one electron beam across a phosphor screen. Each electron beam is deflected in the horizontal direction by the action of the magnetic field generated by the horizontal deflection coil due to the excitation of the horizontal frequency sawtooth current, and at the same time it is deflected in the vertical direction by the action of the magnetic field generated by the vertical deflection coil due to the excitation of the field frequency sawtooth current. direction, thus creating the negative slope or "downhill" scan line that occurs when the electron beam is deflected from left to right to form the CRT raster. ...

Claims

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Application Information

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IPC IPC(8): H04N3/16G09G1/04H04N3/233
CPCH04N3/233H04N3/16
Inventor W·特拉斯克罗P·R·奈特L·E·史密斯
Owner THOMSON CONSUMER ELECTRONICS INC
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