Guy Legrand

Title: Innovations by Guy Legrand in Television Technology

Introduction

Guy Legrand is a notable inventor based in Ruff les Echirey, France. He has made significant contributions to the field of television technology, particularly in the area of convergence measurement for cathode ray tubes. With a total of two patents to his name, Legrand's work has advanced the precision of color display in television systems.

Latest Patents

Legrand's latest patents include a method for the automatic measurement of convergence and a method for measuring the convergence of a three-gun shadow-mask. The first patent focuses on the automatic determination of the characteristics of corrections needed in trichromatic cathode tube deflectors. This method involves measuring the coordinates of the midpoints of the red and blue bars in a crossed bar test pattern at strategic locations. By standardizing the values obtained with the deflector in a mean position, the convergence errors can be computed, leading to precise corrections.

The second patent describes a method for producing monochrome bar patterns on the screen of a three-color television picture tube. This is achieved using a video signal with a Gaussian waveform. The convergence component is determined by measuring the distance between the centers of two differently colored bars. A photosensor, consisting of a charge-coupled photosensitive strip and an optical system, is utilized for this measurement.

Career Highlights

Legrand has dedicated his career to enhancing television technology through innovative methods. His work at Videocolor has positioned him as a key figure in the development of advanced display technologies. His patents reflect a deep understanding of the technical challenges associated with color convergence in television systems.

Collaborations

Legrand has collaborated with notable colleagues such as Michel Faivre and Jean-Pierre Fourche. Their combined expertise has contributed to the successful development of innovative solutions in the field.

Conclusion

Guy Legrand's contributions to television technology through his patents have significantly improved the accuracy of color display in cathode ray tubes. His innovative methods continue to influence the industry and enhance viewer experiences.