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Patent US4151444A successfully refreshed from Google Patents.
US4151444A
Expired / Lapsed
US
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Voltage switching circuit for a color display system
Assignee: Tektronix Inc
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Filing: 1977-12-23
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Granted: 1979-04-24
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Expires: 1997-12-23
Abstract
Abstract A power supply for a color display device of the type in which the color of light emitted by a phosphor screen is changed by switching an electron accelerating voltage between different levels, the switching being digitally controlled and being connected so that descending voltage changes are recycled to efficiently drive the supply.
Inventors
- 👤 Timothy A. Jenness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:58
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64; H03K17/601; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/27
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
Voltage switching display system, comprising: a color display device of the type wherein the color of light emitted by a phosphor screen is changed in accordance with an electron accelerating voltage applied thereto; a digitally controlled power supply for providing said accelerating voltage, said supply including means for switching and accelerating voltage between different levels; and means operatively disposed between said display device and said power supply for causing said accelerating voltage to be re-utilized by said power supply on descending voltage levels.
Claim 2
Dependent Claim
83 words
Voltage switching display system, comprising: a color display device of the type wherein the color of light emitted by a phosphor screen is changed in accordance with an electron accelerating voltage applied thereto; a digitally controlled power supply for providing said accelerating voltage, said supply including means for switching and accelerating voltage between different levels; and means operatively disposed between said display device and said power supply for causing said accelerating voltage to be re-utilized by said power supply on descending voltage levels.
Claim 3
Dependent Claim
48 words
The system according to claim 1 wherein said means for switching comprises: a sequence means for providing timing and command signals and including input means for receiving coded information; and means responsive to said timing and command signals for providing selected reference signals for controlling said power supply.
Claim 4
Dependent Claim
42 words
The system according to claim 2 wherein said means operatively disposed between said display device and said power supply includes means responsive to said command signals for causing said accelerating voltage to be re-utilized by said power supply on descending voltage levels.
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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |