US3930120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-beam cathode ray tube having equalized line brightness
Assignee: Raytheon Co
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Filing: 1975-03-06
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Granted: 1975-12-30
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Expires: 1995-03-06
Abstract
Abstract A system for producing a raster display having uniform line brightness is disclosed which is especially suitable for multibeam cathode ray tubes. A multi-beam or multi-gun cathode ray tube having N beams for painting N lines at a time to develop a first raster beginning at a first display line position. Subsequent rasters are developed by painting the same N number of lines at a time with a first line of that raster being scanned at a line position that is displaced between 1 and N-1 lines from the first line position painted in the preceding raster. The parallel input sources to the N beam is multiplexed for maintaining the video display at the proper position. That is, a line of input data is always presented on its corresponding display line position on the screen during successive rasters. By shifting the beams in each subsequent raster and by correspondingly switching (multiplexing) the input video data to the appropriate beams for each subsequent raster, the display appears to the eye to have a substantially uniform average line brightness. The invention herein described was made in the course of or under contract or subcontract thereunder (or grant) with the Department of the Navy.
Inventors
- 👤 Bruce W Keller
- 👤 William C Hoffman
- 👤 Elvin E Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:36
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
250 words
A display system having equalized line brightness comprising: a source of sensor data having said data arranged in a predetermined number of N data lines: display means for displaying a raster of data thereon having N display beams, positioned relative to said screen and relative to each other so that said N beams define N lines on said display means and form a raster of N lines by painting N lines at a time, said N beams being less than said N lines displayed on said display means: data select means coupling said source of data to said display means for reading out selected lines of data N lines at a time beginning at a data second line to form a subsequent raster display on said display means; scanning means coupled to said display means for simultaneously scanning said N beams across said display means in a first dimension; deflecting means coupled to said data select means and to said display means for simultaneously deflecting said N beams in a second dimension for forming a raster by tracing N lines at a time: and said scanning means and said deflecting means paint a first raster commencing by tracing a first data line from said data select means at a first display line position on said display means by a display beam, and said scanning means paint a second raster commencing tracing a second data line from said select means at a second display line position by said first display beam.
Claim 2
Dependent Claim
250 words
A display system having equalized line brightness comprising: a source of sensor data having said data arranged in a predetermined number of N data lines: display means for displaying a raster of data thereon having N display beams, positioned relative to said screen and relative to each other so that said N beams define N lines on said display means and form a raster of N lines by painting N lines at a time, said N beams being less than said N lines displayed on said display means: data select means coupling said source of data to said display means for reading out selected lines of data N lines at a time beginning at a data second line to form a subsequent raster display on said display means; scanning means coupled to said display means for simultaneously scanning said N beams across said display means in a first dimension; deflecting means coupled to said data select means and to said display means for simultaneously deflecting said N beams in a second dimension for forming a raster by tracing N lines at a time: and said scanning means and said deflecting means paint a first raster commencing by tracing a first data line from said data select means at a first display line position on said display means by a display beam, and said scanning means paint a second raster commencing tracing a second data line from said select means at a second display line position by said first display beam.
Claim 3
Dependent Claim
261 words
A raster display system having equalized line brightness comprising: a source of sensor data having said data arranged in a predetermined number of N data lines: a cathode ray tube having a display screen for painting a raster of data thereon having N electron beams, and having control electrodes positioned relative to said screen and relative to each other so that said N beams define N lines on said screen and form a raster of N lines by painting N lines at a time, said N beams being less than said N lines displayed on said screen; data select means coupling said source of data to said cathode ray tube for reading out selected lines of data N lines at a time beginning at a data second line to form a subsequent raster display on said screen; scanning means coupled to said cathode ray tube for simultaneously scanning said N beams across said screen in a first dimension; deflecting means coupled to said data select means and to said cathode ray tube for simultaneously deflecting said N beams in a second dimension for forming A raster by tracing N lines at a time; and said scanning means and said deflecting means paint a first raster commencing by tracing a first data line from said data select means at a first display line position said display screen by a first electron beam, and said scanning means paint a second raster commencing tracing a second data line from said data select means at a second display line position by said first electron beam.
Claim 4
Dependent Claim
261 words
A raster display system having equalized line brightness comprising: a source of sensor data having said data arranged in a predetermined number of N data lines: a cathode ray tube having a display screen for painting a raster of data thereon having N electron beams, and having control electrodes positioned relative to said screen and relative to each other so that said N beams define N lines on said screen and form a raster of N lines by painting N lines at a time, said N beams being less than said N lines displayed on said screen; data select means coupling said source of data to said cathode ray tube for reading out selected lines of data N lines at a time beginning at a data second line to form a subsequent raster display on said screen; scanning means coupled to said cathode ray tube for simultaneously scanning said N beams across said screen in a first dimension; deflecting means coupled to said data select means and to said cathode ray tube for simultaneously deflecting said N beams in a second dimension for forming A raster by tracing N lines at a time; and said scanning means and said deflecting means paint a first raster commencing by tracing a first data line from said data select means at a first display line position said display screen by a first electron beam, and said scanning means paint a second raster commencing tracing a second data line from said data select means at a second display line position by said first electron beam.
Claim 5
Dependent Claim
253 words
A raster display system having equilized line brightness comprising: a source of video data; a cathode ray tube having an information display screen for writing a frame of data thereon having an electron gun providing N electron beams, said electron gun being positioned relative to said screen and having control electrodes positioned relative to each other so that said N beams define N lines on said screen and form a raster by painting N lines at a time, said N lines being a portion of the total lines to be displayed on said screen; means coupling said source of data to said cathode ray tube for modulating said electron beams, said means being for providing parallel channels of video data and data beginning at a first line of stored data to form a first raster display on said screen and for reading out all the stored data beginning at a line other than said first line of stored data to form a subsequent raster display on said screen; scanning means for simultaneously scanning said N beams across said screen in a first dimension; deflecting means for simultaneously deflecting said N beams in a second dimension for forming a raster by tracing N lines at a time; and said scanning means and said deflecting means trace a first raster by tracing a first line of video data at a first line position on said display screen, and a second raster is formed by tracing a first line other than at said first line position.
Claim 6
Dependent Claim
253 words
A raster display system having equilized line brightness comprising: a source of video data; a cathode ray tube having an information display screen for writing a frame of data thereon having an electron gun providing N electron beams, said electron gun being positioned relative to said screen and having control electrodes positioned relative to each other so that said N beams define N lines on said screen and form a raster by painting N lines at a time, said N lines being a portion of the total lines to be displayed on said screen; means coupling said source of data to said cathode ray tube for modulating said electron beams, said means being for providing parallel channels of video data and data beginning at a first line of stored data to form a first raster display on said screen and for reading out all the stored data beginning at a line other than said first line of stored data to form a subsequent raster display on said screen; scanning means for simultaneously scanning said N beams across said screen in a first dimension; deflecting means for simultaneously deflecting said N beams in a second dimension for forming a raster by tracing N lines at a time; and said scanning means and said deflecting means trace a first raster by tracing a first line of video data at a first line position on said display screen, and a second raster is formed by tracing a first line other than at said first line position.
Claim 7
Dependent Claim
62 words
The invention according to claim 3 wherein each raster being comprised of first and second fields and wherein: each of said N beams are controlled by said deflecting means for scanning a first field by tracing a first set of alternate lines on said screen and for scanning said second field by tracing a second set of alternate lines on said screen.
Claim 8
Dependent Claim
63 words
The invention according to claim 3 wherein said control electrodes are for controlling a set of N beams and said cathode ray tube further comprises: a second set of control electrodes for controlling a second set of N beams, said first set of N beams for scanning a first field, and said second set of N beams being for scanning a second field.
Claim 9
Dependent Claim
25 words
The invention according to claim 3 wherein said source of video data comprises: N parallel video channels for providing N beams with narrow band signals.
Claim 10
Independent Claim
224 words
A system for producing a broad band raster type display having lines of equalized brightness comprising: a source of data for storing a predetermined number of data lines; a cathode ray tube having a screen and a plurality of electrodes for producing a plurality of beams, each electrode beam positioned relative to said screen and relative to each other to define a paintbrush-like display on said screen; beam switching means for providing selected ones of said stored data lines to said electron beams to display a first raster on said screen and for providing other selected ones of said stored data lines to said electron beams to display a second raster on said screen; scanning means coupled to said cathode ray tube for controlling said plurality of beams to simultaneously scan such screen in the first dimension; deflecting means coupled to said cathode ray tube for simultaneously deflecting said beams in a second dimension; and said scanning means in said deflecting means developing predetermined magnetic fields to control said beams to cause said plurality of beams to move across said screen in said first and second dimensions to form a plurality of lines on said screen for forMing a first raster, and said deflecting means being for deflecting said beams from said first line position of said first raster and defining a second raster.
Claim 11
Independent Claim
224 words
A system for producing a broad band raster type display having lines of equalized brightness comprising: a source of data for storing a predetermined number of data lines; a cathode ray tube having a screen and a plurality of electrodes for producing a plurality of beams, each electrode beam positioned relative to said screen and relative to each other to define a paintbrush-like display on said screen; beam switching means for providing selected ones of said stored data lines to said electron beams to display a first raster on said screen and for providing other selected ones of said stored data lines to said electron beams to display a second raster on said screen; scanning means coupled to said cathode ray tube for controlling said plurality of beams to simultaneously scan such screen in the first dimension; deflecting means coupled to said cathode ray tube for simultaneously deflecting said beams in a second dimension; and said scanning means in said deflecting means developing predetermined magnetic fields to control said beams to cause said plurality of beams to move across said screen in said first and second dimensions to form a plurality of lines on said screen for forMing a first raster, and said deflecting means being for deflecting said beams from said first line position of said first raster and defining a second raster.
Claim 12
Dependent Claim
74 words
Invention according to claim 7 wherein said raster are comprised of first and second fields and wherein: said deflecting means develop a magnetic field to control said plurality of beams to scan a first field on said screen by tracing a first set of alternate lines on said screen and to control said plurality of beams for scanning a second field on said screen by tracing a second set of alternate on said screen.
Claim 13
Dependent Claim
63 words
Invention according to claim 7 wherein said plurality of electrodes each produce a first plurality of beams and said cathode ray tube further comprises: a second plurality of electrodes each for producing a second plurality of beams, each of said first plurality of beams for scanning a first field, and each of said second plurality of beams being for scanning a second field.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |