US3742482A
Expired / Lapsed
US
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Method and apparatus for generating a traveling display
Assignee: Bunker Ramo Corp
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Filing: 1971-09-08
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Granted: 1973-06-26
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Expires: 1991-09-08
Abstract
Abstract A method and apparatus for generating traveling display on a cyclically scanned electronic display device such as a cathode ray tube (CRT). The characters to be displayed are stored in a memory means with space being provided in the memory for a number of buffer characters waiting to be displayed. At a predetermined time in each cycle of the display a determination is made of the number of buffer characters then awaiting display. Each character is formed from a plurality of strokes. Depending on the number of buffer characters awaiting display, the display is shifted left by a selected number of character strokes for each display cycle. By varying the number of strokes that the display is advanced for each cycle in this way, the rate at which the display is moved may be varied as a function of the rate at which data to be displayed is received. The shifting by a small number of strokes for each cycle provides for a smooth flow of information across the display.
Inventors
- 👤 F Albrecht
- 👤 S Grosky
- 👤 W Baxter
- 👤 R Duggan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:21
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/14; G09G1/02; G09G1/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
148 words
A circuit for generating a traveling display comprising: a display device which is cyclically scanned; an addressable memory means, said memory means having addressable positions for storing a first predetermined number of characters being displayed and addressable positions adapted to store up to a second predetermined number of buffered characters waiting to be displayed; means for indicating the starting address of said first predetermined number of characters; means operative at a predetermined time in each cycle of said display device for determining the number of said buffered characters waiting to be displayed and for incrementing the address indicated by said indicating means by an amount which is dependent on said determined number; and means for reading out the first predetermined number of characters from said memory means in a predetermined sequence, starting at the address indicated by said indicating means, to control the display on said display device.
Claim 2
Dependent Claim
148 words
A circuit for generating a traveling display comprising: a display device which is cyclically scanned; an addressable memory means, said memory means having addressable positions for storing a first predetermined number of characters being displayed and addressable positions adapted to store up to a second predetermined number of buffered characters waiting to be displayed; means for indicating the starting address of said first predetermined number of characters; means operative at a predetermined time in each cycle of said display device for determining the number of said buffered characters waiting to be displayed and for incrementing the address indicated by said indicating means by an amount which is dependent on said determined number; and means for reading out the first predetermined number of characters from said memory means in a predetermined sequence, starting at the address indicated by said indicating means, to control the display on said display device.
Claim 3
Dependent Claim
49 words
A circuit of the type described in claim 1 including means for indicating the address at which a new buffered character is to be stored; and wherein said number of buffered characters determining means includes means for utilizing at least one of said indicating means to make the determination.
Claim 4
Dependent Claim
50 words
A circuit of the type described in claim 2 wherein said number of buffered characters determining means includes means for comparing the addresses in said indicating means, and means responsive to the difference between said addresses for generating an indication of said number of buffered characters waiting to be displayed.
Claim 5
Dependent Claim
74 words
A circuit of the type described in claim 3 wherein said number of buffered character indication generating means includes means responsive to a mismatch in said comparing means for incrementing the count in said new buffered character address indicating means, and means for determining the number of times said address must be incremented before a match is detected in said comparing means, said number serving as an indication of said number of buffered characters.
Claim 6
Dependent Claim
61 words
A circuit of the type described in claim 1 wherein the incrementing of the address 1ndicated by said indicating means may be by two or more discrete different amounts; and wherein the discrete amount by which an address is incremented may vary for a given number of buffered characters depending on the previous history of the number of buffered character determination.
Claim 7
Dependent Claim
65 words
A circuit of the type described in claim 1 wherein said display device is a cathode ray tube which is cyclically refreshed; and wherein each character to be refreshed on a display device is stored in said memory means as one of said first predetermined number of characters and is read out in synchronism with the refresh of the character to control the refresh thereof.
Claim 8
Dependent Claim
102 words
A circuit of the type described in claim 1 wherein there arE two lines of characters in said traveling display; wherein each of said lines has said first predetermined number of characters positions, but wherein characters may appear in the corresponding character position on only one of said lines; wherein said memory includes separately identifiable areas for storing characters to be displayed on each of said lines; and wherein the address indicated in said starting address indicating means may be in the area of memory for either of said lines depending on which area is storing a character at the indicated address.
Claim 9
Dependent Claim
82 words
A circuit of the type described in claim 1 wherein said display consists of characters each formed by changing the visible state of selected points on a plurality of columns of a character matrix; wherein the address incremented in said indicating means is a column address; and including means responsive to the column in said indicating means for controlling the number of columns of the character at the address indicated by said indicating means which are displayed. eadoout means and the diplay
Claim 10
Dependent Claim
73 words
A circuit of the type described in claim 8 wherein said characters reading out means reads characters out in synchronism with the display of said characters on said display device; and wherein said number of columns controlling means includes means for altering the synchronism between said read out means and the display by the time required to form a number of columns equal to the amount by which said column address is incremented.
Claim 11
Dependent Claim
76 words
A circuit of the type described in claim 8 wherein said number of columns controlling means includes means for eliminaing a number of columns equal to the number by which said column address is incremented from the beginning of the display, adding said number of columns to characters at the end of the display, and shifting the remaining characters of the display in the direction of the beginning of the display by said number of columns.
Claim 12
Dependent Claim
104 words
A circuit of the type described in claim 8 wherein said display device is a cathode ray tube, the beam of which cyclically traces a predetermined raster pattern; wherein said memory reading out means reads characters out of said memory in synchronism with the raster pattern reaching the points on the CRT where the characters are to be displayed; and wherein said columns controlling means includes means for altering the timing of the raster to delay line retrace by a time equal to the trace time of the columns indicated by said column address, whereby the cynchronism between said memory and raster is altered.
Claim 13
Independent Claim
131 words
A method for generating a traveling display on a cyclically scanned display device, comprising the steps of: storing in an addressable memory means a first predetermined number of characters being displayed and a second predetermined number of characters waiting to be displayed; indicating the starting address in said addressable memory means of said first predetermined number of characters; determining, at a predetermined time in each cycle of said display, the number of buffered characters waiting to be displayed; incrementing the starting address indicated for said first predetermined number of characters by an amount which is dependent on said determined number; and reading out the first predetermind number of characters from said memory means in a predetermined sequence, starting at said indicated starting address, to control the display of said display device.
Claim 14
Independent Claim
131 words
A method for generating a traveling display on a cyclically scanned display device, comprising the steps of: storing in an addressable memory means a first predetermined number of characters being displayed and a second predetermined number of characters waiting to be displayed; indicating the starting address in said addressable memory means of said first predetermined number of characters; determining, at a predetermined time in each cycle of said display, the number of buffered characters waiting to be displayed; incrementing the starting address indicated for said first predetermined number of characters by an amount which is dependent on said determined number; and reading out the first predetermind number of characters from said memory means in a predetermined sequence, starting at said indicated starting address, to control the display of said display device.
Claim 15
Dependent Claim
84 words
A method of the type described in claim 12 including the steps of indicating the address at which a new buffered character is to be stored; and wherein said number of buffered characters determining steps includes the steps of comparing the addresses indicated for storing a new buffered character with the address for the beginning of said first predetermined number of characters, and generating an indication of said number of buffered characters waiting to be displayed in response to the differEnce between said addresses.
Claim 16
Dependent Claim
226 words
A circuit for generating a traveling ticker display on a cathode ray tube (CRT) having a display screen which is cyclically refreshed, characters being formed on said screen by selectively intensifying spots on a selected number of vertical strokes comprising: a memory having an area for storing stock I.D. information and an area for storing price-volume information, each of said areas having space to store at least one buffered character in addition to the characters being displayed; means for reading out information from the stock I.D. area of memory in synchronism to the refresh of stock I.D. characters during a first horizontal scan of said screen and for reading out information from the price-volume area of memory in synchronism with the refresh of price-volume characters during a second horizontal scan of said screen; and means operative during each succeeding refresh cycle of said CRT for selectively eliminating a number of strokes which is less than said selected number of strokes from the left-most character or characters on said horizontal scans, for adding said number of strokes to the right-most character on a scan, strokes for a new character from the appropriate one of said buffered character position being added to the right end of the display if necessary, and shifting the remaining characters of the ticker display to the left by said number of stroke positions.
Claim 17
Dependent Claim
226 words
A circuit for generating a traveling ticker display on a cathode ray tube (CRT) having a display screen which is cyclically refreshed, characters being formed on said screen by selectively intensifying spots on a selected number of vertical strokes comprising: a memory having an area for storing stock I.D. information and an area for storing price-volume information, each of said areas having space to store at least one buffered character in addition to the characters being displayed; means for reading out information from the stock I.D. area of memory in synchronism to the refresh of stock I.D. characters during a first horizontal scan of said screen and for reading out information from the price-volume area of memory in synchronism with the refresh of price-volume characters during a second horizontal scan of said screen; and means operative during each succeeding refresh cycle of said CRT for selectively eliminating a number of strokes which is less than said selected number of strokes from the left-most character or characters on said horizontal scans, for adding said number of strokes to the right-most character on a scan, strokes for a new character from the appropriate one of said buffered character position being added to the right end of the display if necessary, and shifting the remaining characters of the ticker display to the left by said number of stroke positions.
Claim 18
Dependent Claim
54 words
A circuit of the type described in claim 14 wherein said means operative during each succeeding refresh cycle includes means for altering the synchronism between the reading out of information from said memory and the refresh of characters on said CRT by the time required for said CRT to form said number of strokes.
Claim 19
Dependent Claim
50 words
A circuit of the type described in claim 15 where the ray of said CRT traces a predetermined raster pattern; and wherein said synchronism altering means includes means for altering the timing of the CRT raster to delay line retrace by said time required to form said number of strokes.
Claim 20
Dependent Claim
76 words
A circuit of the type described in claim 16 including means for generating an extra horizontal scan of said screen before said first horizontal scan and an extra horizontal scan of said screen after said second horizontal scan, the first extra scan having said number of strokes added after the last characters of its raster, and the second extra scan having said number of strokes subtracted from its first character raster, whereby raster synchronism is reestablished.
Claim 21
Dependent Claim
67 words
A circuit of the type described in claim 14 wherein there are a plurality of buffer charater storing positions in each of said areas of memory; and including means for determining the number of characters stored in said buffered character storing positions; and means responsive to the number of buffered characters determined for controlling said number of strokes eliminated, added and shifted during each succeeding refresh cycle.
References Cited (Backward Citations)
US3422420A
Cited
US3559208A
Cited
US3643252A
Cited
US3566388A
Cited
US3614766A
Cited
US3611348A
Cited
US3623070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |