US3898644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TV display system
Assignee: QSI SYSTEMS Inc
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Filing: 1973-09-13
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Granted: 1975-08-05
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Expires: 1993-09-13
Abstract
Abstract A character display system having a raster type cathode ray tube display including a continuously updated display segment for such information as date and time. Data defining the updated portion of the display is stored in a circulating shift register having a counter stage and an output stage connected to a character generator. The data is shifted in synchronism with the raster scan so that the output stage of the register synchronously provides information to the character generator to generate the updated portion of the display. The counter stage is appropriately incremented when containing data to be modified, thereby updating the display information being circulated.
Inventors
- 👤 Larry K Baxter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/14; G09G1/16; G04; G04G; G04G9/00; G04G9/0058
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
184 words
A character display system for displaying characters in raster form, said system comprising A. a raster encoder that converts the combination of 1. vertical timing signals, 2 horizontal timing signals and 3 character code signals representing a character to be displayed into signals corresponding to a raster presentation of the character, B. means for generating the horizontal timing signals, C. means for generating the vertical timing signals, D. a circulating character shift register that 1. shifts in response to shift signals, 2. contains, in the form of said character code, the characters to be displayed, and 3. includes i. output conductors that provide to said encoder the character code input therefor, said characters being arranged in said shift register so as to be shifted to said output conductors in the order in which they are to be displayed, ii. a counter as one stage thereof, E. means for incrementing said counter tO update the displayed information, F. means for applying shift signals to said shift register in synchronism with the tracing of the portions of the raster lines associated with the respective displayed characters.
Claim 2
Dependent Claim
184 words
A character display system for displaying characters in raster form, said system comprising A. a raster encoder that converts the combination of 1. vertical timing signals, 2 horizontal timing signals and 3 character code signals representing a character to be displayed into signals corresponding to a raster presentation of the character, B. means for generating the horizontal timing signals, C. means for generating the vertical timing signals, D. a circulating character shift register that 1. shifts in response to shift signals, 2. contains, in the form of said character code, the characters to be displayed, and 3. includes i. output conductors that provide to said encoder the character code input therefor, said characters being arranged in said shift register so as to be shifted to said output conductors in the order in which they are to be displayed, ii. a counter as one stage thereof, E. means for incrementing said counter tO update the displayed information, F. means for applying shift signals to said shift register in synchronism with the tracing of the portions of the raster lines associated with the respective displayed characters.
Claim 3
Dependent Claim
14 words
contains, in the form of said character code, the characters to be displayed, and
Claim 4
Dependent Claim
14 words
contains, in the form of said character code, the characters to be displayed, and
Claim 5
Dependent Claim
59 words
The system defined in claim 1 including A. means for generating segment signals corresponding to the presence of predetermined parts of the displayed information in a predetermined stage of said character register, and B. means for changing the contents of said predetermined register stage in synchronism with said segment signals, thereby to update the information displayed by said system.
Claim 6
Dependent Claim
21 words
exceeds the modulus for that item, and C. means for clearing each item in response to the overflow signal corresponding thereto.
Claim 7
Dependent Claim
21 words
exceeds the modulus for that item, and C. means for clearing each item in response to the overflow signal corresponding thereto.
Claim 8
Dependent Claim
21 words
exceeds the modulus for that item, and C. means for clearing each item in response to the overflow signal corresponding thereto.
Claim 9
Dependent Claim
21 words
exceeds the modulus for that item, and C. means for clearing each item in response to the overflow signal corresponding thereto.
Claim 10
Dependent Claim
114 words
The system defined in claim 2 including A. a carry shift register having a stage corresponding to each stage in said character register and shifting in response to said shift signals, B. means for inserting a bit into a first stage of said carry register when said counter overflows, and said first stage corresponding to the character register stage containing a first digit in a number whose next less significant digit is contained in said counter, C. means for incrementing said counter whenever a second stage in said carry register, corresponding to said counter, contains said bit, thereby to advance said first digit when there is an overflow of said next less significant digit.
Claim 11
Dependent Claim
87 words
includes i. output conductors that provide to said encoder the character code input therefor, said characters being arranged in said shift register so as to be shifted to said output conductors in the order in which they are to be displayed, ii. a counter as one stage thereof, E. means for incrementing said counter tO update the displayed information, F. means for applying shift signals to said shift register in synchronism with the tracing of the portions of the raster lines associated with the respective displayed characters.
Claim 12
Dependent Claim
87 words
includes i. output conductors that provide to said encoder the character code input therefor, said characters being arranged in said shift register so as to be shifted to said output conductors in the order in which they are to be displayed, ii. a counter as one stage thereof, E. means for incrementing said counter tO update the displayed information, F. means for applying shift signals to said shift register in synchronism with the tracing of the portions of the raster lines associated with the respective displayed characters.
Claim 13
Dependent Claim
79 words
A system as defined in claim 3 having the capability of displaying different items of countable information having different moduli, said system comprising A. a first decoder connected to decode the contents of one or more character register stages to provide output signals corresponding to predetermined contents of said one or more stages, coincidence means for gating each of said decoder output signals with a segment signal, thereby to provide an overflow signal for each item when that item
Claim 14
Dependent Claim
80 words
A system as defined in claim 2 having the capability of displaying different items of countable information having different moduli, said system comprising A. a first decoder connected to decode the contents of one or more character register stages to provide output signals corresponding to predetermined contents of said one or more stages, B. coincidence means for gating each of said decoder output signals with a segment signal, thereby to provide an overflow signal for each item when that item
Claim 15
Dependent Claim
116 words
A system as defined in claim 5 including means for updating a first item of information in response to the overflow of a second item of information, and A. in which said coincidence means further provides a carry signal upon the coincidence of an output signal with a segment signal, and B. including means for applying the carry signal resulting from overflow of said second item to the stage of said carry register then corresponding to the character register stage containing the least significant digit of said first item, thereby to insert a carry bit into that carry register stage and consequently advance said least significant digit when that digit is next contained in said counter.
Claim 16
Dependent Claim
38 words
The system defined in claim 6 in which the items of information are time divisions and including A. a clock and B. means for advancing one of said time divisions in response to the output of said clock.
Claim 17
Dependent Claim
73 words
A system as defined in claim 7 A. in which said time divisions include the year, the month and the day of the month, B. including a second decoder connected to said character register to provide month length signals indicating the lengths of months contained in the character registEr. C. in which said coincidence means further responds to said month length signals in providing carry and overflow signals at the ends of months.
References Cited (Backward Citations)
US3388391A
Cited
US3422420A
Cited
US3818482A
Cited
US3816730A
Cited
US3714663A
Cited
US3772874A
Cited
US3786481A
Cited
US3792613A
Cited
US3803587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |