U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Albertus A S Sluyterman

Nicolaas G Vink

Tjerk G Spanjer

Daniel Den Engelsen

Leopold C M Beirens

Johannes C A Van Nes

Evert Seevinck

A color display device having an electron gun, a display screen, a color selection electrode and a deflection unit. The distance between the electron beams in the x-direction is dynamically varied, whereby the distance in the deflection space decreases as the beams are deflected in at least one direction. The reduction of the distance enables the distance between the color selection electrode and the display screen to be increased in that direction. As a result, the curvature of the color selection electrode is increased, which has a positive effect on the strength and the doming and microphonic properties of the color selection electrode.

Color display device with a deflection-dependent distance between outer beams

A cathode ray tube device in which two deflection yokes and two electron guns are used, but in which only one shadow mask is used. Image uniformity is obtained by creating a partial overlap of the two images created by the two yokes.

Laterally spaced multiple electron gun color cathode ray tube device

The invention relates to a color display device comprising an in-line electron gun ( ) for generating three electron beams ( ), and a convergence unit ( &prime;) to dynamically influence the convergence of the electron beams, preferably to decrease a distance (p) between the electron beams. The convergence unit ( &prime;) comprises a ring-shaped element ( &prime;) having four coils ( &prime;). The coils ( &prime;) comprise electrically conductive wires, which have been toroidally wound in a winding direction and according to a winding density distribution N (&phgr;) given by N (&phgr;)&equals;N cos (2&phgr;). Here &phgr; is an angle enclosed by the X-direction and a line between an element of the coil and the center, which ranges between 0&deg; and 360&deg;, N is the winding density at &phgr; equal to 0&deg;, and the sign of N &phgr; denotes the winding direction.

Color display device having quadrupole convergence coils

The invention relates to a color display device comprising an in-line electron gun ( ) for generating three electron beams ( ), and a convergence unit ( ) to dynamically influence the convergence of the electron beams, preferably to decrease a distance (p) between the electron beams. The convergence unit ( ) comprises a ring-shaped element ( ) having four coils ( ) and a longitudinal axis ( ). A cross-section of the ring-shaped element ( ) with a plane perpendicular to the longitudinal axis ( ) is a circle with the longitudinal axis as its center and the ring-shaped element ( ) forming the circumference. Each coil extends over the circumference over an angle &phgr; having a value between &deg; and

A color display device comprises an electron gun, a display screen with a curved inner surface and a flat color selection electrode as well as a deflection means. The distance between the electron beams is dynamically varied, whereby the distance in the deflection space increases as the beams are deflected in at least one direction. The reduction of the distance enables the distance between the color selection electrode and the display screen to be decreased in that direction. As a result, the curvature of the inner surface of the display window is increased, which has a positive effect on the strength and weight of the display window.

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Eindhoven, Netherlands

Albertus A S Sluyterman