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US3748375A
Expired / Lapsed
US
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Television image-display system
Assignee: Individual
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Filing: 1971-10-08
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Granted: 1973-07-24
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Expires: 1991-10-08
Abstract
Abstract In a color television image-display system of the type utilizing a screen comprising triplets of vertical phosphor stripes across which the cathode-ray beam is scanned with an intensity controlled by the color television signal to form the color image, and in which index elements are arranged in predetermined geometric configuration with respect to the triplets to provide index signals indicative of beam position, an additional beamintensity varying signal is applied to the tube in such frequency and phase that the beam intensity is reduced by the additional signal whenever the beam is centered midway between successive color phosphor stripes. In one embodiment, the stripes are spaced apart from each other and the spaces are occupied by a black material producing negligible light emission in response to beam impingement. In such case, beam current is normally wasted during impingement of the spaces between stripes, and the additional signal utilized in accordance with the invention to reduce the beam intensity at such times results in a net saving in beam current. In another preferred form, the stripes are contiguous or nearly so, and the additional signal reduces the beam intensity on, and adjacent, the lines between successive stripes so as to minimize ''''cross talk'''' between stripes. The additional signal for this purpose is preferably derived from the indexing signal by appropriate frequency multiplication and phasing.
Inventors
- 👤 D Sunstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:26
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/22; H04N9/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
211 words
In a television image-display system comprising, a cathoderay tube including image-forming screen means, means for forming a cathode-ray beam in said tube and for scanning it across said screen means, and means responsive to an applied signal for controlling the intensity of said scanning beam to form an image on said screen means, said screen means comprising a plurality of similar groups of controllable light-influeNcing elements disposed across said screen means, adjacent elements in each of said groups responding to impingement by said beam to present light of a corresponding different characteristic, at least one of said elements in each of said groups being separated from an adjacent element along the direction of said scanning by a region which produces negligible light at the viewed side of said screen means in response to impingement by said beam; and means for applying to said beam-intensity controlling means a television signal to form said image on said screen means: the improvement comprising, means for generating an additional signal having a frequency substantially equal to the rate at which said elements are scanned by said beam and means for using said additional signal to reduce the intensity of said beam each time said beam is substantially centered midway between adjacent ones of said elements.
Claim 2
Dependent Claim
211 words
In a television image-display system comprising, a cathoderay tube including image-forming screen means, means for forming a cathode-ray beam in said tube and for scanning it across said screen means, and means responsive to an applied signal for controlling the intensity of said scanning beam to form an image on said screen means, said screen means comprising a plurality of similar groups of controllable light-influeNcing elements disposed across said screen means, adjacent elements in each of said groups responding to impingement by said beam to present light of a corresponding different characteristic, at least one of said elements in each of said groups being separated from an adjacent element along the direction of said scanning by a region which produces negligible light at the viewed side of said screen means in response to impingement by said beam; and means for applying to said beam-intensity controlling means a television signal to form said image on said screen means: the improvement comprising, means for generating an additional signal having a frequency substantially equal to the rate at which said elements are scanned by said beam and means for using said additional signal to reduce the intensity of said beam each time said beam is substantially centered midway between adjacent ones of said elements.
Claim 3
Dependent Claim
35 words
Apparatus in accordance with claim 1, comprising material substantially filling each of said regions, said material producing negligible light emission at the viewed side of said screen means in response to impingement by said beam.
Claim 4
Dependent Claim
36 words
Apparatus in accordance with claim 2, comprising a plurality of index elements positioned in predetermined geometric relation to said light-influencing elements so as to be impinged successively by said scanning beam to generate an index signal.
Claim 5
Dependent Claim
25 words
Apparatus in accordance with claim 3, in which each of said index elements is wider in the direction of said scanning than are said regions.
Claim 6
Dependent Claim
48 words
Apparatus in accordance with claim 4, in which the number of said index elements in a major portion of said screen is an odd integral multiple, greater than one, of 1/N times the number of said groups, where N is an even number smaller than said odd multiple.
Claim 7
Dependent Claim
222 words
In a color television image-display system, comprising a cathode-ray tube including image-forming screen means, means for forming a cathode-ray beam in said tube and for scanning it across said screen means, and means responsive to an applied signal for controlling the intensity of said scanning beam to form a color image on said screen means, said screen means comprising a plurality of similar triplets of light-emissive elements disposed across said screen means, adjacent elements in each of said triplets being responsive to impingement by said beam to produce light of a corresponding different color, each of said light-emissive elements being spaced from those on opposite sides thereof, the spaces between said light-emissive elements being occupied by material which produces negligible light emission at the viewed side of said screen means in response to impingement by said beam, the spaces between said elements being regularly positioned so as to be scanned by said beam at a predetermined frequency; and means for applying to said beam-intensity controlling means a color television signal to form said color image on said screen means: the improvement comprising, means for applying to said beam-intensity controlling means an additional signal alternating at said frequency and having a phase such as to produce its maximum reductions in beam intensity when said beam is directed toward said material in said spaces.
Claim 8
Dependent Claim
222 words
In a color television image-display system, comprising a cathode-ray tube including image-forming screen means, means for forming a cathode-ray beam in said tube and for scanning it across said screen means, and means responsive to an applied signal for controlling the intensity of said scanning beam to form a color image on said screen means, said screen means comprising a plurality of similar triplets of light-emissive elements disposed across said screen means, adjacent elements in each of said triplets being responsive to impingement by said beam to produce light of a corresponding different color, each of said light-emissive elements being spaced from those on opposite sides thereof, the spaces between said light-emissive elements being occupied by material which produces negligible light emission at the viewed side of said screen means in response to impingement by said beam, the spaces between said elements being regularly positioned so as to be scanned by said beam at a predetermined frequency; and means for applying to said beam-intensity controlling means a color television signal to form said color image on said screen means: the improvement comprising, means for applying to said beam-intensity controlling means an additional signal alternating at said frequency and having a phase such as to produce its maximum reductions in beam intensity when said beam is directed toward said material in said spaces.
Claim 9
Dependent Claim
28 words
Apparatus in accordance with claim 6, in which each of said spaces is occupied by material which produces negligible light emission in response to impingement by said beam.
Claim 10
Dependent Claim
27 words
The apparatus of claim 6, in which said additional signal is substantially a sinusoid at three times the frequency of scanning of said triplets by said beam.
Claim 11
Dependent Claim
88 words
The apparatus of claim 8, comprising a plurality of index elements arranged in predetermined geometric configuration with respect to said triplets so to be impinged by said scanning beam, and responsive thereto to produce index signals representative of the position of said beam and having a frequency bearing a predetermined known ratio to the frequency at which said triplets are scanned by said beam, frequency conVersion means responsive to said index signals for producing said additional signal, and phase-shifting means for providing said phase of said additional signal.
Claim 12
Dependent Claim
38 words
The apparatus of claim 9, in which said index elements are positioned toward the source of said beam with respect to said light-emissive elements, and are of greater width than said spaces in the direction of said scanning.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |