Patent US4587566A successfully refreshed from Google Patents.
US4587566A
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US
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Automatic kinescope bias control system with modified initial operation
Assignee: RCA Licensing Corp
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Filing: 1984-05-09
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Granted: 1986-05-06
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Expires: 2004-05-09
Abstract
Abstract In a video signal processing system such as a video monitor including an automatic kinescope bias (AKB) control system, the time required for the AKB system to initially achieve correct kinescope biasing is reduced with respect to a given interval of time beginning when the video processing system is initially energized. This is accomplished by reducing a storage time constant of the AKB system during the given interval, and by pre-charging a storage element of the AKB system during the given interval.
Inventors
- 👤 Werner Hinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:39
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N9/00; H04N9/64; H04N9/72
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
In a video signal processing system including an image display device for displaying an image in response to image representative video signals applied thereto, apparatus comprising: means for energizing said system; bias control means coupled to said display device for automatically controlling a bias condition of said display device to maintain a desired bias condition for said display device; and enabling means coupled to said bias control means and to said energizing means and responsive to the initial energization of said system for reducing the time otherwise required for said bias control means to initially achieve said desired bias condition with reference to the time at which said system is initially energized.
Claim 2
Dependent Claim
112 words
In a video signal processing system including an image display device for displaying an image in response to image representative video signals applied thereto, apparatus comprising: means for energizing said system; bias control means coupled to said display device for automatically controlling a bias condition of said display device to maintain a desired bias condition for said display device; and enabling means coupled to said bias control means and to said energizing means and responsive to the initial energization of said system for reducing the time otherwise required for said bias control means to initially achieve said desired bias condition with reference to the time at which said system is initially energized.
Claim 3
Dependent Claim
41 words
Apparatus according to claim 1, wherein said bias control means comprises signal storage means determinative of an operating time constant of said bias control means; and said enabling means causes said storage means to exhibit a pre-set initial signal storage condition.
Claim 4
Dependent Claim
21 words
Apparatus according to claim 2, wherein said storage means stores a signal representative of the bias condition of said display device.
Claim 5
Dependent Claim
39 words
Apparatus according to claim 3, wherein said display device corresponds to a kinescope having a cathode electrode; and said storage means comprises a capacitor for storing a voltage representative of a black current level conducted by said cathode electrode.
Claim 6
Dependent Claim
16 words
Apparatus according to claim 1, wherein said video signal processing system corresponds to a video monitor.
Claim 7
Dependent Claim
59 words
Apparatus according to claim 1, wherein said bias control means comprises a time constant network determinative of an operating time constant of said bias control means; and said enabling means is coupled to said time constant network for reducing the time constant thereof over a given interval between said time said system is initially energized and a later time.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 6, wherein said time constant network includes a resistance and a capacitance; and said enabling means modifies the value of said resistance during said given interval to produce said reduced time constant.
Claim 9
Dependent Claim
31 words
Apparatus according to claim 7, wherein said capacitance stores a voltage representative of the bias condition of said display device; and said resistance corresponds to a charging impedance for said capacitance.
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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |