US4376260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for compensating for intensity variations and beam landing errors in flat panel display devices
Assignee: RCA Corp
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Filing: 1981-10-14
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Granted: 1983-03-08
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Expires: 2001-10-14
Abstract
Abstract A system for correcting for intensity variations and electron beam landing errors in a flat panel display device includes two compensation means. The first compensation means applies a continuously varying voltage to the modulation electrodes to add a varying current to the electron beam current. The compensation current offsets the intensity variations of the electron beam. The second compensation means applies an averaged position signal to the modulation electrodes to compensate for beam landing errors of the electron beam.
Inventors
- 👤 John P. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/28; H04N3/12; H04N3/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A system for compensating for intensity variations and electron beam landing errors in a flat panel display device having at least one beam guide for propagating said electron beam and a modulator for varying said electron beam in accordance with video information comprising: first means for applying a continuously variable signal to said modulator to compensate for intensity variations of said electron beams; second means for applying an averaged position signal to said modulator to compensate for landing errors of said electron beam.
Claim 2
Independent Claim
83 words
A system for compensating for intensity variations and electron beam landing errors in a flat panel display device having at least one beam guide for propagating said electron beam and a modulator for varying said electron beam in accordance with video information comprising: first means for applying a continuously variable signal to said modulator to compensate for intensity variations of said electron beams; second means for applying an averaged position signal to said modulator to compensate for landing errors of said electron beam.
Claim 3
Dependent Claim
14 words
The system of claim 1 wherein said first means is a sinusoidal signal generator.
Claim 4
Dependent Claim
23 words
The system of claim 2 wherein the output of said sinuosoidal generator has a phase 180° out of phase with said intensity variations.
Claim 5
Independent Claim
28 words
The system of claims 1 or 2 or 3 wherein said averaged position signal from said second means is the average of the two nearest correct landing positions.
Claim 6
Dependent Claim
74 words
The system of claim 4 wherein said averaged position signal is defined by the relationship ##EQU4## where: S 1 and S 2 are signals representing the two nearest correct landing positions, x 1 y 1 is one of the nearest correct landing positions, x 2 y 2 is the other nearest correct landing positions, S(x v , y H ) is the compensation signal for the landing position (x V , y H ).
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) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |