US4119954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution character generator for digital display units
Assignee: Unisys Corp
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Filing: 1977-03-15
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Granted: 1978-10-10
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Expires: 1997-03-15
Abstract
Abstract The disclosure relates to a digital display system including a display monitor and character generation circuitry to create characters on the display screen in the form of a dot matrix during the scanning of the display screen. The display screen is actually scanned twice with each field of scan being controlled by the same sets of signals from the character generator. Logic circuitry is provided between the character generator and the display screen to fill in information bit areas adjacent to character dot areas which form a diagonal so as to thereby give the displayed character a smooth appearance.
Inventors
- 👤 Charles Lewis Seitz
- 👤 Paul Grunewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:20
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/22; G09G5/24; G09G5/28
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
143 words
A system for displaying characters in a dot matrix form, said system comprising: a display unit having a display face and means to scan said display face in an interlaced scan mode; storage means to store information signals to representative of characters to be displayed, said storage means including a first store to hold information signals for even lines of the display and a second store to hold information signals for odd lines of display, which even and odd lines are to be displayed in said interlaced scan mode; and logic means coupled to said display unit and to said storage means to receive information signals from both of said first store and second store at the same time and to generate extra bits signals for display during the particular scan being displayed whenever the information signals to be displayed form a diagonal.
Claim 2
Independent Claim
143 words
A system for displaying characters in a dot matrix form, said system comprising: a display unit having a display face and means to scan said display face in an interlaced scan mode; storage means to store information signals to representative of characters to be displayed, said storage means including a first store to hold information signals for even lines of the display and a second store to hold information signals for odd lines of display, which even and odd lines are to be displayed in said interlaced scan mode; and logic means coupled to said display unit and to said storage means to receive information signals from both of said first store and second store at the same time and to generate extra bits signals for display during the particular scan being displayed whenever the information signals to be displayed form a diagonal.
Claim 3
Dependent Claim
17 words
A system according to claim 1 wherein the display unit includes a cathode ray tube display screen.
Claim 4
Dependent Claim
14 words
A system according to claim 1 wherein said display unit includes a matrix printer.
Claim 5
Independent Claim
121 words
A system for display of characters in a dot matrix form, said system comprising: a display unit having a display face and means to scan said display face in an interlaced scan mode; storage means including a first storage to hold information signals for even lines of the display and a second store to hold information signals for odd lines of the display which signals represent characters to be displayed, said odd and even lines being displayed in said interlaced scan mode; and logic means coupled to said display unit and to said first and second stores to generate extra bit signals for display whenver the information signals from said first and second stores form a diagonal line to be displayed.
Claim 6
Independent Claim
121 words
A system for display of characters in a dot matrix form, said system comprising: a display unit having a display face and means to scan said display face in an interlaced scan mode; storage means including a first storage to hold information signals for even lines of the display and a second store to hold information signals for odd lines of the display which signals represent characters to be displayed, said odd and even lines being displayed in said interlaced scan mode; and logic means coupled to said display unit and to said first and second stores to generate extra bit signals for display whenver the information signals from said first and second stores form a diagonal line to be displayed.
Claim 7
Dependent Claim
79 words
A system according to claim 4 wherein: said logic means include circuitry to generate signals according to the Boolean expressions: C.sub.2N = a.sub.N + a.sub.N-1 b'.sub.N-1 b.sub.N For 2≦2N+1<11 c.sub.2n+1 = a.sub.N + a .sub.N+1 b'.sub.N+1 b.sub.N For the boundaries: C 0 =C 1 =0 c 11 =a 5 where the C's represent the output signals to be generated, the a's represent the information signals from the first store and the b's represent information signals from the second store.
Claim 8
Dependent Claim
100 words
In a system for the display of characters in a dot matrix form, said system including a display unit and storage means to store information signals representative of characters to be displayed, said storage means including a first store to store information signals for even lines of the display and a second store to store information signals for odd lines of the display, the method comprising: retrieving information signals from said storage means; generating extra bit signals for the display whenever the information signals to be displayed form a diagonal; and displaying said even and odd lines in interlaced scans.
Claim 9
Dependent Claim
100 words
In a system for the display of characters in a dot matrix form, said system including a display unit and storage means to store information signals representative of characters to be displayed, said storage means including a first store to store information signals for even lines of the display and a second store to store information signals for odd lines of the display, the method comprising: retrieving information signals from said storage means; generating extra bit signals for the display whenever the information signals to be displayed form a diagonal; and displaying said even and odd lines in interlaced scans.
Claim 10
Dependent Claim
110 words
In a system for the display of characters in a dot matrix form, said system including a display unit and storage means having a first store to hold information signals for even lines of the display and a second store to hold information signals for odd lines of the display, the method comprising: retrieving information signals from said first and second stores in sequence; generating extra bit signals for display whenever the information signals from said first and second stores form a diagonal line to be displayed; and displaying said even and odd lines in interlaced scans so that said information signals and said extra bit signals form a character.
Claim 11
Dependent Claim
110 words
In a system for the display of characters in a dot matrix form, said system including a display unit and storage means having a first store to hold information signals for even lines of the display and a second store to hold information signals for odd lines of the display, the method comprising: retrieving information signals from said first and second stores in sequence; generating extra bit signals for display whenever the information signals from said first and second stores form a diagonal line to be displayed; and displaying said even and odd lines in interlaced scans so that said information signals and said extra bit signals form a character.
Claim 12
Dependent Claim
73 words
A method according to claim 7 including: generating signals according to the Boolean expressions: C.sub.2N = a.sub.N + a.sub.N-1 b'.sub.N-1 b.sub.N For 2≦2N+1<11 c.sub.2n+1 = a.sub.N + a .sub.N+1 b'.sub.N+1 b.sub.N For the boundaries: C 0 =C 1 =0 c 11 =a 5 where the C's represent the output signals to be generated, the a's represent the information signals from the first store and the b's represent information signals from the second store.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |