Patent · US Expired

Circuitry for correcting geometrical distortions

US5077501A · kind A · utility

4Cited by

1References

7Claims

0Family size

Assignee

Deutsche Thomson-Brandt GmbH · DE

Inventors

Uwe Hartmann · Stuttgart, DE
Franz Dieterle · Schiltach, DE
Fritz Ohnemus · Villingen-Schwenningen, DE

Key dates

Filing date	Aug 24, 1988
Grant date	Dec 31, 1991
Priority date	—
Expiry date	Aug 24, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH04N3/237
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A circuit for correcting geometrical distortions in reproducing signals on a screen of a cathode-ray tube in a display monitor. A line-frequency correction current having line deflection frequency is coupled into the vertical deflection unit which serves for deflecting vertically electron beams in the cathode-ray tube. A circuit which provides horizontal deflection current is connected to the primary winding of a differential transformer. The differential transformer has a secondary winding connected to the circuit which supplies vertical deflection current. The distortion is reflected by a cathode-ray tube which has a substantially flat picture screen, in which horizontal lines to be displayed form in angle with a horizontal reference grid.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.