US4338624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On screen color display
Assignee: Zenith Electronics LLC
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Filing: 1981-01-05
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Granted: 1982-07-06
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Expires: 2001-01-05
Abstract
Abstract A television receiver includes an interface circuit enabling the production of on-screen displays of alpha-numeric type information in a selected color. The interface circuit is responsive to a blanking signal for reducing the red, green and blue video signals developed in response to a received NTSC color television signal below the blanking level of the television receiver. A digital signal representing selected alpha-numeric type information is coupled from a character generator to the interface circuit for increasing the potential at one or more of the electron guns of the receiver for producing a corresponding on-screen display in a selected color.
Inventors
- 👤 Alain H. d'Hautecourt
- 👤 George J. Tzakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:27
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/641
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
177 words
In a color television receiver having means developing red, green and blue video signals at respective circuit terminals in response to a received television signal and output means adapted for processing said video signals for producing a corresponding video image on a color CRT, the improvement comprising: means operable for developing an information signal; means operable for developing a blanking signal; means responsive to said blanking signal for shunting each of said circuit terminals for maintaining the potential thereof at or below the blanking level of said CRT; means forming a circuit node between each of said circuit terminals and said output means, each of said circuit nodes being adapted for developing a potential above the blanking level of said CRT; and means operable for coupling said information signal to selected ones of said circuit nodes for developing a potential at said selected circuit nodes above the blanking level of said CRT, whereby an image is produced on the screen of said CRT corresponding to said information signal and in a color determined by said selected nodes.
Claim 2
Dependent Claim
177 words
In a color television receiver having means developing red, green and blue video signals at respective circuit terminals in response to a received television signal and output means adapted for processing said video signals for producing a corresponding video image on a color CRT, the improvement comprising: means operable for developing an information signal; means operable for developing a blanking signal; means responsive to said blanking signal for shunting each of said circuit terminals for maintaining the potential thereof at or below the blanking level of said CRT; means forming a circuit node between each of said circuit terminals and said output means, each of said circuit nodes being adapted for developing a potential above the blanking level of said CRT; and means operable for coupling said information signal to selected ones of said circuit nodes for developing a potential at said selected circuit nodes above the blanking level of said CRT, whereby an image is produced on the screen of said CRT corresponding to said information signal and in a color determined by said selected nodes.
Claim 3
Dependent Claim
37 words
The improvement according to claim 1 wherein said means for shunting comprises a plurality of diodes each connected to a respective one of said circuit terminals and responsive to said blanking signal for assuming a conductive state.
Claim 4
Dependent Claim
31 words
The improvement according to claim 1 wherein said circuit node forming means comprises a plurality of resistors each connected between a respective one of said circuit terminals and said output means.
Claim 5
Dependent Claim
31 words
The improvement according to claim 1 wherein said means for coupling comprises a plurality of diodes each adapted for coupling said information signal to a respective one of said circuit nodes.
Claim 6
Dependent Claim
30 words
The improvement according to claim 1 wherein said information signal developing means comprises character generator means operable for developing a digital information signal representing selected alpha-numeric or graphics type data.
Claim 7
Dependent Claim
51 words
The improvement according to claim 5 wherein said character generator means includes a single output conductor developing said digital information signal and wherein said means for coupling comprises means adapted for coupling said digital information signal from said single output conductor to each of said selected ones of said circuit nodes.
Claim 8
Dependent Claim
46 words
The improvement according to claim 5 wherein said character generator means includes three output conductors developing said digital information signal and wherein said means for coupling comprises means adapted for coupling each of said three output conductors to a respective one of said selected circuit nodes.
Claim 9
Dependent Claim
205 words
In a color television receiver having means developing red, green and blue video signals at respective circuit terminals in response to a received television signal and output means adapted for processing said video signals for producing a corresponding video image on a color CRT, the improvement comprising: means operable for developing an information signal; means operable in time coincidence with said information signal developing means for developing a blanking signal; a plurality of first diodes each connected to a respective one of said circuit terminals, each of said first diodes assuming a conductive state in response to said blanking signal for shunting each of said circuit terminals for maintaining the potential thereof at or below the blanking level of said CRT; means forming a circuit node between each of said circuit terminals and said output means, each of said circuit nodes being resistively isolated from its associated circuit terminal; and means operable for coupling said information signal to selected ones of said circuit nodes for developing a potential at said selected circuit nodes above the blanking level of said CRT, whereby an image is produced on the screen of said CRT corresponding to said information signal and in a color determined by said selected nodes.
Claim 10
Dependent Claim
205 words
In a color television receiver having means developing red, green and blue video signals at respective circuit terminals in response to a received television signal and output means adapted for processing said video signals for producing a corresponding video image on a color CRT, the improvement comprising: means operable for developing an information signal; means operable in time coincidence with said information signal developing means for developing a blanking signal; a plurality of first diodes each connected to a respective one of said circuit terminals, each of said first diodes assuming a conductive state in response to said blanking signal for shunting each of said circuit terminals for maintaining the potential thereof at or below the blanking level of said CRT; means forming a circuit node between each of said circuit terminals and said output means, each of said circuit nodes being resistively isolated from its associated circuit terminal; and means operable for coupling said information signal to selected ones of said circuit nodes for developing a potential at said selected circuit nodes above the blanking level of said CRT, whereby an image is produced on the screen of said CRT corresponding to said information signal and in a color determined by said selected nodes.
Claim 11
Dependent Claim
30 words
The improvement according to claim 8 wherein said information signal developing means comprises character generator means operable for developing a digital information signal representing selected alpha-numeric or graphics type data.
Claim 12
Dependent Claim
51 words
The improvement according to claim 9 wherein said character generator means includes a single output conductor developing said digital information signal and wherein said means for coupling comprises means adapted for coupling said digital information signal from said single output conductor to each of said selected ones of said circuit nodes.
Claim 13
Dependent Claim
46 words
The improvement according to claim 9 wherein said character generator means includes three output conductors developing said digital information signal and wherein said means for coupling comprises means adapted for coupling each of said three output conductors to a respective one of said selected circuit nodes.
Claim 14
Dependent Claim
35 words
The improvement according to claim 8 wherein said means for coupling comprises a plurality of unidirectional conduction paths each connected between said information signal developing means and a respective one of said selected circuit nodes.
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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |