Color display tube
First Claim
1. A display tube for reproducing color images on a screen in response to color input signal information, comprising:
- an electron gun structure for emitting an electron beam directed toward said screen, wherein the intensity of said beam is modulated in accordance with Z-axis image input information;
deflection means for causing said electron beam to scan said screen in accordance with image synchronization input information provided in X and Y axes;
said screen being provided with plural phosphor material areas each adapted to emit light of a selected color when scanned by said electron beam;
a shadowmask interposed between said electron gun structure and said screen, said shadowmask having a multiplicity of openings through which at least a portion of said electron beam may pass to reach areas of phosphor material as an opening in said mask is substantially aligned with an area of phosphor material; and
means for providing lateral relative movement between said shadowmask and said screen to vary the alignment between screen areas and said openings in order to change the color of light in said image.
0 Assignments
0 Petitions
Accused Products
Abstract
A color cathode ray tube employs a shadowmask having substantially vertical slots positioned between a single electron gun and substantially vertical color phosphor stripes on the faceplate of the tube. Piezoelectric bimorph actuators translate the shadowmask back and forth in a direction generally perpendicular to the direction of the slots and stripes in synchronization with field sequential color information to excite the phosphor stripes. In an alternative embodiment, the phosphor screen is moved relative to a fixed shadowmask. During the relative movement between the shadowmask and screen in a first direction, video information is provided from a memory in a first sequential manner, while for relative movement in a second direction, the video information is read out of memory in a reverse direction for executing a reverse raster starting from the bottom of the screen. The slots and phosphor stripes are skewed slightly with respect to one another to maintain proper color registration. In a further embodiment, instead of a shadowmask, a gating array is located between a broad source of electrons and the phosphor screen.
73 Citations
29 Claims
-
1. A display tube for reproducing color images on a screen in response to color input signal information, comprising:
-
an electron gun structure for emitting an electron beam directed toward said screen, wherein the intensity of said beam is modulated in accordance with Z-axis image input information; deflection means for causing said electron beam to scan said screen in accordance with image synchronization input information provided in X and Y axes; said screen being provided with plural phosphor material areas each adapted to emit light of a selected color when scanned by said electron beam; a shadowmask interposed between said electron gun structure and said screen, said shadowmask having a multiplicity of openings through which at least a portion of said electron beam may pass to reach areas of phosphor material as an opening in said mask is substantially aligned with an area of phosphor material; and means for providing lateral relative movement between said shadowmask and said screen to vary the alignment between screen areas and said openings in order to change the color of light in said image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A display tube for reproducing color images on a screen in response to color input signal information, comprising:
-
an electron gun structure for emitting an electron beam directed toward said screen, wherein the intensity of said beam is modulated in accordance with Z-axis image input information; deflection means for causing said electron beam to scan said screen in accordance with image synchronization input information provided in X and Y axes; said screen being provided with plural phosphor material areas each adapted to emit light of a selected color when scanned by said electron beam; a shadowmask interposed between said electron gun structure and said screen, said shadowmask having a multiplicity of openings through which at least a portion of said electron beam may pass to reach areas of phosphor material as an opening in said mask is substantially aligned with an area of phosphor material; and means for providing lateral relative positioning between said shadowmask and said screen to change the alignment between screen areas and said openings. - View Dependent Claims (16, 17)
-
-
18. A display device for reproducing color images on a screen in response to color input signal information, comprising:
-
a source means for emitting electrons; said screen being provided with plural phosphor material areas each adapted to emit light of a selected color in response to electron emission from said source means; control means interposed between said source means and said screen, said control means having a multiplicity of openings through which at least a portion of said electrons from said source may pass to reach areas of phosphor material as an opening in said control means is substantially aligned with an area of phosphor material; and means for providing lateral relative movement between said control means and said screen to change the alignment between screen areas and said openings. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
Specification