US4785564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic notepad
Assignee: NXP USA Inc
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Filing: 1982-12-20
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Granted: 1988-11-22
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Expires: 2002-12-20
Abstract
Abstract An electronic notepad comprises a wire/display area for receiving and displaying graphic information, a control for the device and a keyboard for entering information and/or instructions. Two types of liquid crystal display arrays, both fabricated on a semiconductor substrate with logic cells and reflector/field electrodes thereon are described. Further, two methods of sensing the position of a stylus are described whereby a user may enter graphic information directly into the notepad.
Inventors
- 👤 Richard W. Gurtler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:08
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0412; G06F3/042; G06F3/047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
A liquid crystal display comprising: a semiconductor substrate; an array of reflector/field electrodes disposed on said substrate; a logic cell associated with each electrode, said logic cell being switchable between first and second states and being capable of maintaining either of said first and second states; address lines and signal lines on said substrate between said electrodes and coupled to said logic cells; a multi-layer liquid crystal apparatus on said substrate; and position sensing means coupled to said logic cells through said lines for sensing a position of a stylus with respect to said array and for activating indicating ones of said logic cells, said position sensing means comprising: a lower layer; a first plurality of conductive lines arranged in a parallel fashion on said lower layer; a flexible layer separated from said lower layer by an insulating medium; and a second plurality of conductive lines arranged in a parallel fashion on an upper layer, said second plurality of lines being substantially perpendicular to said first plurality of lines, whereby pressure from said stylus on said upper layer causes localized contact between said conductive lines, said positioned sensing means being disposed on a top layer of said liquid crystal apparatus.
Claim 2
Dependent Claim
200 words
A liquid crystal display comprising: a semiconductor substrate; an array of reflector/field electrodes disposed on said substrate; a logic cell associated with each electrode, said logic cell being switchable between first and second states and being capable of maintaining either of said first and second states; address lines and signal lines on said substrate between said electrodes and coupled to said logic cells; a multi-layer liquid crystal apparatus on said substrate; and position sensing means coupled to said logic cells through said lines for sensing a position of a stylus with respect to said array and for activating indicating ones of said logic cells, said position sensing means comprising: a lower layer; a first plurality of conductive lines arranged in a parallel fashion on said lower layer; a flexible layer separated from said lower layer by an insulating medium; and a second plurality of conductive lines arranged in a parallel fashion on an upper layer, said second plurality of lines being substantially perpendicular to said first plurality of lines, whereby pressure from said stylus on said upper layer causes localized contact between said conductive lines, said positioned sensing means being disposed on a top layer of said liquid crystal apparatus.
Claim 3
Dependent Claim
138 words
A liquid crystal display comprising: a semiconductor substrate; an array of reflector/field electrodes disposed on said substrate; a logic cell associated with each said electrode, said logic cell being switchable between first and second states and being capable of maintaining either of said first and second states; address lines and signal lines on said substrate between said electrodes and coupled to said logic cells; and a multi-layer liquid crystal apparatus on said substrate, said multi-layer liquid crystal apparatus comprising: a quarter wavelength birefringent film overlying said substrate and reflector/field electrodes; a twisted nematic liquid crystal layer overlying said film, said liquid crystals having a 45° twist; a transparent electrode layer overlying said liquid crystal layer; a glass layer overlying said transparent electrode layer; a polarizing film overlying said glass layer; and a top layer overlying said polarizing film.
Claim 4
Dependent Claim
138 words
A liquid crystal display comprising: a semiconductor substrate; an array of reflector/field electrodes disposed on said substrate; a logic cell associated with each said electrode, said logic cell being switchable between first and second states and being capable of maintaining either of said first and second states; address lines and signal lines on said substrate between said electrodes and coupled to said logic cells; and a multi-layer liquid crystal apparatus on said substrate, said multi-layer liquid crystal apparatus comprising: a quarter wavelength birefringent film overlying said substrate and reflector/field electrodes; a twisted nematic liquid crystal layer overlying said film, said liquid crystals having a 45° twist; a transparent electrode layer overlying said liquid crystal layer; a glass layer overlying said transparent electrode layer; a polarizing film overlying said glass layer; and a top layer overlying said polarizing film.
Claim 5
Dependent Claim
150 words
A liquid crystal display according comprising: a semiconductor substrate; an array of reflector/field electrodes disposed on said substrate; a logic cell associated with each said electrode, said logic cell being switchable between first and second and being capable of maintaining either of said first and second states; address lines and signal lines on said substrate between said electrodes and coupled to said logic cells; and a multi-layer liquid crystal apparatus on said substrate, said multi-layer liquid crystal apparatus comprising: a passive/planarizing layer overlying said substrate and said reflector/field electrodes; a polarizing film overlying said passive/planarizing layer; an insulating film overlying said polarizing film; a twisted nematic liquid crystal overlying said insulating film, said liquid crystals having a 90° twist; a transparent electrode layer overlying said liquid crystal layer; a glass layer overlying said electrode layer; a polarizing film overlying said glass layer; and a top layer overlying said polarizing film.
Claim 6
Dependent Claim
150 words
A liquid crystal display according comprising: a semiconductor substrate; an array of reflector/field electrodes disposed on said substrate; a logic cell associated with each said electrode, said logic cell being switchable between first and second and being capable of maintaining either of said first and second states; address lines and signal lines on said substrate between said electrodes and coupled to said logic cells; and a multi-layer liquid crystal apparatus on said substrate, said multi-layer liquid crystal apparatus comprising: a passive/planarizing layer overlying said substrate and said reflector/field electrodes; a polarizing film overlying said passive/planarizing layer; an insulating film overlying said polarizing film; a twisted nematic liquid crystal overlying said insulating film, said liquid crystals having a 90° twist; a transparent electrode layer overlying said liquid crystal layer; a glass layer overlying said electrode layer; a polarizing film overlying said glass layer; and a top layer overlying said polarizing film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |