US4704630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide bandwidth display driver apparatus
Assignee: RCA Licensing Corp
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Filing: 1986-11-18
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Granted: 1987-11-03
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Expires: 2006-11-18
Abstract
Abstract To improve the bandwidth of a display driver stage in a wideband video signal processing and display system, the output of a display driver amplifier is coupled to a display device via a transmission line having an unterminated output end, a misterminated source end to develop a negative non-zero source reflection coefficient, and a phase delay within a given range.
Inventors
- 👤 William E. Rodda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:51
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/148
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
A video signal processing and display system comprising: an image display device for reproducing an image in response to a video signal applied to an input thereof; a display driver amplifier for providing an output video signal with a magnitude suitable for directly driving said input of said image display device; and means for coupling said output video signal from said display driver amplifier to said input of said image display device, said coupling means including a transmission line having a source end coupled to said output of said display driver amplifier and an output end coupled to said input of said image display device; wherein to improve the bandwidth of said system said transmission line is misterminated at said source end to produce a nonzero, negative source reflection coefficient; and said transmission line exhibits a minimum phase delay of approximately twenty degrees and a maximum phase delay of approximately sixty degrees, with respect to a cutoff high frequency of a video signal to be conveyed to said display driver amplifier.
Claim 2
Dependent Claim
171 words
A video signal processing and display system comprising: an image display device for reproducing an image in response to a video signal applied to an input thereof; a display driver amplifier for providing an output video signal with a magnitude suitable for directly driving said input of said image display device; and means for coupling said output video signal from said display driver amplifier to said input of said image display device, said coupling means including a transmission line having a source end coupled to said output of said display driver amplifier and an output end coupled to said input of said image display device; wherein to improve the bandwidth of said system said transmission line is misterminated at said source end to produce a nonzero, negative source reflection coefficient; and said transmission line exhibits a minimum phase delay of approximately twenty degrees and a maximum phase delay of approximately sixty degrees, with respect to a cutoff high frequency of a video signal to be conveyed to said display driver amplifier.
Claim 3
Dependent Claim
15 words
A system according to claim 1, wherein said transmission line is a shielded coaxial cable.
Claim 4
Dependent Claim
49 words
A system according to claim 1, wherein said coupling means includes a terminating resistance for coupling said output video signal from said display driver amplifier to said source end of said transmission line; and said transmission line has a characteristic impedance greater than the value of said terminating resistance.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 1, wherein said image display device is a kinescope with a cathode signal input electrode.
References Cited (Backward Citations)
US3699272A
Cited
US4464636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |