US4437092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color video display system having programmable border color
Assignee: International Business Machines Corp
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Filing: 1981-08-12
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Granted: 1984-03-13
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Expires: 2001-08-12
Abstract
Abstract A central processing unit (10) loads a border register (36) with four color bits representing digital color signals to be used in determining the color of only the border area (40) surrounding the video area (42) of a cathode ray tube display screen (44). A BORDER CONTROL TIME signal is generated at the appropriate times in the horizontal and vertical scanning periods of the cathode ray tube to apply the digital color border signals (R, G, G, I) to a composite video signal generator (38) which generates the composite video signal for a TV set (14) or a TV monitor.
Inventors
- 👤 Mark E. Dean
- 👤 Lewis C. Eggebrecht
- 👤 David A. Kummer
- 👤 Jesus A. Saenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02; G09G5/024
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
207 words
A color video display system comprising: a color cathode-ray tube display; central processing means for providing a signal defining a normal display area and first data representing video information to be displayed on said cathode-ray tube display in said normal display area of said cathode-ray tube display and second data representing a color of a predefined border area completely surrounding said normal display area and extending to all display edges of said cathode-ray tube display; means operating in response to vertical and horizontal synchronizing signals of said display and said display area defining signal for generating a control signal having a first state when a scanning beam of said cathode-ray tube display is scanning said normal display area and a second state when said scanning beam is scanning said border area; and multiplexer means operating in response to said control signal for applying said first data to said color cathode-ray tube display when said control signal is in said first state and said second data to said cathode-ray tube display when said control signal is in said second state; whereby a selected color may be provided in said border area and memory limited to that necessary for storing information to be displayed in said normal display area.
Claim 2
Dependent Claim
207 words
A color video display system comprising: a color cathode-ray tube display; central processing means for providing a signal defining a normal display area and first data representing video information to be displayed on said cathode-ray tube display in said normal display area of said cathode-ray tube display and second data representing a color of a predefined border area completely surrounding said normal display area and extending to all display edges of said cathode-ray tube display; means operating in response to vertical and horizontal synchronizing signals of said display and said display area defining signal for generating a control signal having a first state when a scanning beam of said cathode-ray tube display is scanning said normal display area and a second state when said scanning beam is scanning said border area; and multiplexer means operating in response to said control signal for applying said first data to said color cathode-ray tube display when said control signal is in said first state and said second data to said cathode-ray tube display when said control signal is in said second state; whereby a selected color may be provided in said border area and memory limited to that necessary for storing information to be displayed in said normal display area.
Claim 3
Dependent Claim
27 words
The display system of claim 1, further comprising a border color register disposed between said central processing means and said multiplexer means for storing said second data.
Claim 4
Dependent Claim
29 words
The display system of claim 2, wherein said control signal generating means comprises gating means operating in response to vertical and horizontal synchronizing signals of said cathode-ray tube display.
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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |