Laterally spaced multiple electron gun color cathode ray tube device
AssigneeKoninklijke Philips Electronics N.V.
InventorsAlbertus A. S. Sluyterman, Evert Seevinck
Life of this patent
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Abstract
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.
Claims15
A color cathode ray tube device comprising a cathode ray tube having a single screen section divided into two sub-regions only, and means for separately scanning the sub-regions, characterized in that:
- said two sub-regions are adjoining sub-regions,
- each of said sub-regions has one overlap region associated therewith where the two sub-regions overlap,
- the cathode ray tube comprises one color selection electrode only, and a plurality of respective necks, deflection yokes and electron guns arranged to emit electron beams which lie substantially in a same plane when not deflected,
- said screen is elongated in a direction from one of said sub-regions to the other of said sub-regions, thereby defining a longer screen dimension and a shorter screen dimension,
- each of said electron guns and deflection yokes scans all of a respective one only of said sub-regions and the overlap region, and
- the color selection electrode is a shadowmask, said electron guns lie in a plane parallel to the longer screen dimension, and said electron guns and the respective necks are arranged at opposite angles (α, −α) with respect to the shadowmask.
A color cathode ray tube device comprising a cathode ray tube having a single screen section divided into a plurality of sub-regions, and means for separately scanning the sub-regions, characterized in that:
- each of said sub-regions has at least one overlap region associated therewith where one sub-region and an adjoining sub-region overlap,
- two of said sub-regions overlap one other sub-region only,
- the cathode ray tube comprises one color selection electrode only, and a plurality of respective necks, deflection yokes and electron guns arranged to emit electron beams which lie substantially in a same plane when not deflected, and
- each of said electron guns and deflection yokes scans all of a respective one only of said sub-regions, and the overlap regions associated with the respective one only of said sub-regions, and
- the device comprises means for effecting a gradual variation of intensity of the electron beams from the respective electron guns of the adjoining sub-regions across an overlap region.
A color cathode ray tube device comprising a cathode ray tube having a single screen section divided into a plurality of sub-regions, and means for separately scanning the sub-regions, characterized in that:
- each of said sub-regions has at least one overlap region associated therewith where one sub-region and an adjoining sub-region overlap,
- two of said sub-regions overlap one other sub-region only,
- the cathode ray tube comprises one color selection electrode only, and a plurality of respective necks, deflection yokes and electron guns arranged to emit electron beams which lie substantially in a same plane when not deflected, and
- each of said electron guns and deflection yokes scans all of a respective one only of said sub-regions, and the overlap regions associated with the respective one only of said sub-regions,
- wherein the color selection electrode is a mask having a multiplicity of mask holes, each electron gun is an in-line electron gun for generating a respective center and two outer beams, and the screen comprises a phosphor pattern comprising phosphor areas for different colors, characterized in that a distance (D) between the necks, a mask to screen distance (q) and a screen pitch are chosen such that when the center beams of two guns go through a same mask hole in an overlap region both beams reach a phosphor area of the same color.
Dependencies are inferred from the claim text.