Method and apparatus for direct contact printing screens on CRT faceplates
AssigneeZenith Electronics Corporation
InventorsRichard J. Duchek, Paul Strauss
Life of this patent
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Abstract
Direct contact printing methods and apparatuses are disclosed for applying screen elements to cathode ray tube (CRT) faceplates. A black-surround, or grille, is first applied to the faceplate, followed by deposition of light-emissive phosphors thereon. Means for repeatable positioning of the screen elements on the faceplate, means for registration of the screen elements with each other, and means for maintaining screen element shape and size are also disclosed. Effective pivot axes for the collector are arranged to lie in the plane of the printing substrates.
Claims9
An apparatus for the application of color display screens to display device panels, comprising:
- a) a main frame defining an aperture sized to admit a collector frame;
- b) a collector frame sized to fit within the main frame aperture and pivotably connected to the main frame so as to pivot substantially about an axis parallel to the plane of a printing substrate, the collector frame also defining an aperture;
- c) a collector sized to fit within the collector frame aperture and pivotably connected to the collector frame so as to pivot substantially about an axis parallel to the plane of a printing substrate and perpendicular to the pivot axis of the collector frame.
In a method of offset printing a color display screen from a gravure plate onto a substantially rigid display panel with a cylindrical transfer roller, the improvement comprising;
- conforming the surface of the transfer roller to the surface of the gravure plate during image pickup therefrom, and conforming the surface of the transfer roller to the surface of the display panel during image deposition thereon, by allowing the cylindrical transfer roller to pivot side to side, and up and down during pick up and deposition, so as to equalize the transfer pressure between the transfer roller and each of the gravure plate and panel, during their respective periods of contact, so as to compensate for any wedging in placement of the gravure plate or display panel and thereby insure uniform deposition of the display screen image onto the display panel.
Dependencies are inferred from the claim text.