Abstract The subject matter of this invention is a single gun color TV tube having a means for generating a beam of electrons such as an electron gun, and a means for sequentially receiving red, green, and blue color information in a predetermined order for modulating the electron beam, such as a control electrode. The target area of the tube includes a plurality of spaced red, green, and blue phosphor strips generally vertically disposed and arranged in a predetermined order. On the electron receiving face of each phosphor strip there is deposited a conductive coating. In operation the coatings on the strips corresponding to the color information modulating the beam have applied thereon a positive potential while a lower or negative potential is being applied to the coatings on the other phosphor strips for focusing the electron beam. A guard band preferably having a height greater than that of the phosphor strips is disposed between adjacent phosphor strips, each of which has deposited thereon a conductive coating for receiving a fixed positive potential so as to attract stray electrons generally due to secondary emission.
The tube of claim 1 wherein said guard band means includes a guard band strip raised above said phosphor strips.
Claim 2
Dependent Claim
146 words
A color tube comprising means for generating a beam of electrons; means for sequentially receiving red, green, and blue color information in a predetermined cyclical order for modulating said beam; a target area comprising a transparent face plate; a plurality of spaced red, green and blue phosphor strips deposited on said face plate and arranged in a predetermined cyclical order; an aluminum coating deposited on the electron receiving face of each of said strips forming thereby a plurality of spaced conductive coatings, the conductive coatings on the phosphor strips of identical color being electrically coupled to each other and insulated from other coatings; a guard band strip formed of a nonconductive, nonfluorescent material disposed between adjacent ones of said phosphor strips and coextensive therewith; and aluminum coating deposited on each of said guard bands and being electrically insulated from said aluminum coatings on said phosphor strips.
Claim 3
Dependent Claim
21 words
The tube of claim 3 wherein the height of said guard bands is greater than the height of said phosphor strips.
Claim 4
Dependent Claim
28 words
The tube of claim 4 wherein said coating on each of said guard bands is deposited on at least a portion of said surface facing said electron beam.
Claim 5
Dependent Claim
21 words
The tube of claim 5 including means for applying a positive potential to said coating on each of said guard bands.
Claim 6
Dependent Claim
36 words
The tube of claim 6 including means for applying a positive potential to each of said coatings on similar color phosphor strips while simultaneously applying a lower potential to said coatings on the other phosphor strips.