US5654529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stylus-input computing system with erasure
Assignee: Samsung Electronics Co Ltd
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Filing: 1995-05-03
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Granted: 1997-08-05
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Expires: 2015-05-03
Abstract
Abstract A handheld computing device has a planar display and a superimposed, transparent digitizer. The combination is arranged to simulate writing or drawing with pencil on paper: the writing end of a passive stylus is pressed on and moved across the digitizer surface and a line on the display is produced directly under the stylus path. In order to complete the analogy to pencil and paper, display erasure is also provided. Under the display is located an inductive winding. The other end of the stylus contains a small permanent magnet. When the magnet end of the stylus is pressed against the digitizer and moved over a display line, a small voltage is induced in the inductive winding. This voltage is converted into a logic signal. The assertion of this signal together with a signal from the digitizer results in the erasure of display traces in the region inferred from the digitizer signal.
Inventors
- 👤 Chun Wun Yeung
- 👤 Beng Hong Kang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:56
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/048; G06F3/0487; G06F3/0488; G06F3/03; G06F3/033; G06F3/0354; G06F3/03545; G06F3/038; G06F3/0383
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
In a stylus-based electronic writing system, comprising a digitizer traversed by a writing stylus and an electronic display imaging the path of the writing stylus across the digitizer, a method for erasing a portion of the image, the method comprising the steps of: a) securing a permanent magnet to an erasing end of the writing stylus opposite a writing end; b) co-locating an inductive winding with the digitizer; c) contacting the digitizer with the erasing end of the writing stylus; d) monitoring the inductive winding for the presence of a signal induced therein by motion of the permanent magnet; and e) erasing a portion of the image indicated by the path of the erasing end across the digitizer when there is a signal simultaneously present in the inductive winding.
Claim 2
Dependent Claim
129 words
In a stylus-based electronic writing system, comprising a digitizer traversed by a writing stylus and an electronic display imaging the path of the writing stylus across the digitizer, a method for erasing a portion of the image, the method comprising the steps of: a) securing a permanent magnet to an erasing end of the writing stylus opposite a writing end; b) co-locating an inductive winding with the digitizer; c) contacting the digitizer with the erasing end of the writing stylus; d) monitoring the inductive winding for the presence of a signal induced therein by motion of the permanent magnet; and e) erasing a portion of the image indicated by the path of the erasing end across the digitizer when there is a signal simultaneously present in the inductive winding.
Claim 3
Dependent Claim
28 words
A method for erasing, as recited in claim 1, including after step (b) the further step of b1) co-locating the display with the inductive winding and the digitizer.
Claim 4
Dependent Claim
125 words
A stylus-based electronic writing system having both writing and erasing functions, comprising: a) a writing stylus having a writing end and an erasing end, and a permanent magnet secured to the erasing end; b) a digitizer having a writing surface and an output for signals indicating a location on the writing surface touched by the writing stylus; c) an electronic display having a drive input; d) a display driver having an input coupled to the digitizer output, an ERASE ENABLE input, and a drive output coupled to the electronic display drive input; e) an inductive winding similiar in size to, and proximate the digitizer; f) a conditioning circuit having an input coupled to the inductive winding and an output coupled to the ERASE ENABLE input.
Claim 5
Dependent Claim
125 words
A stylus-based electronic writing system having both writing and erasing functions, comprising: a) a writing stylus having a writing end and an erasing end, and a permanent magnet secured to the erasing end; b) a digitizer having a writing surface and an output for signals indicating a location on the writing surface touched by the writing stylus; c) an electronic display having a drive input; d) a display driver having an input coupled to the digitizer output, an ERASE ENABLE input, and a drive output coupled to the electronic display drive input; e) an inductive winding similiar in size to, and proximate the digitizer; f) a conditioning circuit having an input coupled to the inductive winding and an output coupled to the ERASE ENABLE input.
Claim 6
Dependent Claim
18 words
A stylus-based electronic writing system, as recited in claim 3, wherein the writing stylus is a passive device.
Claim 7
Dependent Claim
25 words
A stylus-based electronic writing system, as recited in claim 3, wherein the display driver is incorporated within a microprocessor controlling the stylus-based electronic writing system.
Claim 8
Dependent Claim
23 words
A stylus-based electronic writing system, as recited in claim 3, wherein the digitizer comprises pressure-sensitive conductive sheets having X and Y output signals.
Claim 9
Dependent Claim
18 words
A stylus-based electronic writing system, as recited in claim 3, wherein the electronic display is a liquid-crystal type.
Claim 10
Dependent Claim
18 words
A stylus-based electronic writing system, as recited in claim 3, wherein the inductive winding is a planar spiral.
Claim 11
Dependent Claim
25 words
A stylus-based electronic writing system, as recited in claim 3, wherein the conditioning circuit further comprises a full-wave rectifier coupled to a logic level translator.
Claim 12
Dependent Claim
24 words
A stylus-based electronic writing system, as recited in claim 3, wherein the electronic display is similiar in size to, and co-located with, the digitizer.
Claim 13
Dependent Claim
155 words
A stylus-based electronic writing system having both writing and erasing functions, comprising: a) a writing stylus having a writing end and an erasing end, and a permanent magnet secured to the erasing end b) a transparent digitizer having a writing surface and an output for signals indicating a location on the writing surface touched by the writing stylus; c) an electronic display similiar in size to, and co-located with the transparent digitizer proximate a surface of the transparent digitizer opposite the writing surface, the electronic display having a drive input; d) a display driver having an input coupled to the transparent digitizer output, an ERASE ENABLE input, and a drive output coupled to the electronic display drive input; e) an inductive winding similiar in size to the transparent digitizer and display, and co-located therewith; f) a conditioning circuit having an input coupled to the inductive winding and an output coupled to the ERASE ENABLE input.
Claim 14
Dependent Claim
155 words
A stylus-based electronic writing system having both writing and erasing functions, comprising: a) a writing stylus having a writing end and an erasing end, and a permanent magnet secured to the erasing end b) a transparent digitizer having a writing surface and an output for signals indicating a location on the writing surface touched by the writing stylus; c) an electronic display similiar in size to, and co-located with the transparent digitizer proximate a surface of the transparent digitizer opposite the writing surface, the electronic display having a drive input; d) a display driver having an input coupled to the transparent digitizer output, an ERASE ENABLE input, and a drive output coupled to the electronic display drive input; e) an inductive winding similiar in size to the transparent digitizer and display, and co-located therewith; f) a conditioning circuit having an input coupled to the inductive winding and an output coupled to the ERASE ENABLE input.
Claim 15
Dependent Claim
24 words
A stylus-based electronic writing system, as recited in claim 11, wherein the transparent digitizer, the electronic display, and the inductive winding are planar devices.
References Cited (Backward Citations)
US4670751A
Cited
US4646107A
Cited
US4697050A
Cited
EP0229637A2
Cited
US4711977A
Cited
US5134388A
Cited
US5231578A
Cited
EP0618715A1
Cited
US5401916A
Cited
EP0622753A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-04 | 2001-02-03 | 2001-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-04 | 2005-02-03 | 2005-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-04 | 2009-02-03 | 2009-08-05 | $7700.00 | Window Closed / Lapsed |