US3787834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display system
Assignee: International Business Machines Corp
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Filing: 1972-12-29
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Granted: 1974-01-22
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Expires: 1992-12-29
Abstract
Abstract A system for displaying information on a large liquid crystal display unit, for example a 1,600 character unit. The unit is divided into separately addressed matrices of characters. A particular row in each matrix is addressed on a time-multiplex basis during each display cycle. During the succeeding cycle, the succeeding row in each matrix is addressed and so on. The multiplexing sequence uses the slow excitation time and slower de-excitation time of the liquid crystal element to advantage.
Inventors
- 👤 J Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:57
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/302; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3644
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
18 words
A system as in claim 1 wherein a single row of devices is excited during each display cycle.
Claim 2
Dependent Claim
30 words
A system as in claim 1 further comprising: means connected to said transmitting means for storing information signals representative of all symbols to be displayed on all of said devices.
Claim 3
Dependent Claim
33 words
A system as in claim 3 wherein said transmitting means comprises: character generator means responsive to said information storing means for generating binary representations of characters to be displayed on said display unit.
Claim 4
Dependent Claim
35 words
A system as in claim 4 wherein said transmitting means further comprises: means connected to the output of said character generator means for transmitting said binary symbols in serial fashion to said shift register means.
Claim 5
Dependent Claim
28 words
A system as in claim 1 wherein the entire display unit is addressed within a duration at least equal to the de-excitation time of a liquId crystal device.
Claim 6
Dependent Claim
29 words
A system as in claim 1 wherein: said display devices are segmented characters; and each said buffer register means comprises a shift register having outputs for driving said segments.
Claim 7
Dependent Claim
44 words
A system as in claim 7 wherein: the number of said outputs is equal to the number of segments in a single row of characters in a matrix; and each said output is connected to a single segment in each row of the matrix.
Claim 8
Independent Claim
157 words
A system for information display comprising: a display unit including a plurality of matrices of display devices; said devices being characterized by a relatively long excitation time and a longer de-excitation time; a plurality of buffer register means, each unique to a single display matrix, for storing symbol representations of a complete row of symbols in each matrix; means for transmitting symbol representations to said buffer register means; control means connected to said buffer register means, said transmitting means and said devices, said control means comprising: means for loading said symbol representations into said buffer register means in sequence on a time-multiplex basis during a display cycle; row driver means for activating a selected row of each matrix for a duration at least equal to said excitation time in the same said sequence; and row select means for advancing said row driver means to activate another selected row in each said matrix during a succeeding display cycle.
Claim 9
Dependent Claim
30 words
A system as in claim 9 further comprising: means connected to said transmitting means for storing information signals representative of all symbols to be displayed on all of said devices.
Claim 10
Dependent Claim
75 words
A system as in claim 10 wherein said control means further comprises: character select means for addressing said information storing means to cause representations of a character to be transmitted to said buffer register means; and set select means responsive to a signal from said character select means for selecting a succeeding matrix at the end of a row of characters and for signalling said row select means when the last matrix has been addressed.
Claim 11
Dependent Claim
33 words
A system as in claim 10 wherein said transmitting means comprises: character generator means responsive to said information storing means for generating binary representations of characters to be displayed on said display unit.
Claim 12
Dependent Claim
35 words
A system as in claim 12 wherein said transmitting means further comprises: means connected to the output of said character generator means for transmitting said binary symbols in serial fashion to said shift register means.
Claim 13
Dependent Claim
14 words
A system as in claim 9 wherein said display devices are liquid crystal devices.
Claim 14
Dependent Claim
29 words
A system as in claim 14 wherein: said display devices are segmented characters; and each said buffer register means comprises a shift register having outputs for driving said segments.
Claim 15
Dependent Claim
43 words
A system as in claim 15 wherein: the number of outputs is equal to the number of segments in a single row of characters in a matrix; and each said output is connected to a single segment in each row of the matrix.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |