US5442373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display-integrated type tablet device
Assignee: Sharp Corp
•
Filing: 1993-05-19
•
Granted: 1995-08-15
•
Expires: 2013-05-19
Abstract
Abstract Displacement between an actual designation position designated by a detection pen and a detection coordinates is corrected. A correction calculation section includes a plurality of processing mode determination modules, a propagation delay correction module, an inward displacement correction module, a waveform distortion correction module, and a periodical fluctuation correction module. The processing mode determination module determines a correction module according to a detection coordinate value input. Each of the correction modules includes a correction formula or a lookup table inherent to each area. According to the correction formula or the lookup table, input detection coordinate value is corrected to thereby correct the displacement between the actual designation position and the detection coordinate value.
Inventors
- 👤 Toshio Nomura
- 👤 Takao Tagawa
- 👤 Noritoshi Kako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:29
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0412; G06F3/0416; G06F3/0418; G06F3/04184; G06F3/044; G06F3/0441
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
252 words
A display-integrated type table device including a display panel driven by first electrodes and second electrodes crossing each other at right angles, a detection pen having at a tip thereof an electrode which can be electrostatically coupled with the first electrodes and the second electrodes, a first electrode drive circuit for driving the first electrodes, a second electrode drive circuit for driving the second electrodes, a display control circuit for displaying an image on the display panel by controlling the first electrode drive circuit and the second electrode drive circuit in an image display period, a detection control circuit for sequentially scanning at least one of the first and second electrodes of the display panel by controlling at least one of the first and second drive circuits in a coordinate detection period, and a coordinate detection circuit for detecting at least one of a detection x-coordinate value and a detection y-coordinate value on the display panel designated by the tip of the detection pen based on a time of generating an output signal from the detection pen and a time of scanning at least one of the first and second electrodes, the display-integrated type table device comprising a correction processing circuit which has an inward displacement correction module for correcting an inward displacement of at least one of the detection x-coordinate value and the detection y-coordinate value attributed to a reduction in number of at least one of the first electrodes and the second electrodes to which a scanning pulse is applied.
Claim 2
Dependent Claim
252 words
A display-integrated type table device including a display panel driven by first electrodes and second electrodes crossing each other at right angles, a detection pen having at a tip thereof an electrode which can be electrostatically coupled with the first electrodes and the second electrodes, a first electrode drive circuit for driving the first electrodes, a second electrode drive circuit for driving the second electrodes, a display control circuit for displaying an image on the display panel by controlling the first electrode drive circuit and the second electrode drive circuit in an image display period, a detection control circuit for sequentially scanning at least one of the first and second electrodes of the display panel by controlling at least one of the first and second drive circuits in a coordinate detection period, and a coordinate detection circuit for detecting at least one of a detection x-coordinate value and a detection y-coordinate value on the display panel designated by the tip of the detection pen based on a time of generating an output signal from the detection pen and a time of scanning at least one of the first and second electrodes, the display-integrated type table device comprising a correction processing circuit which has an inward displacement correction module for correcting an inward displacement of at least one of the detection x-coordinate value and the detection y-coordinate value attributed to a reduction in number of at least one of the first electrodes and the second electrodes to which a scanning pulse is applied.
References Cited (Backward Citations)
US4947156A
Cited
US4798920A
Cited
US4818851A
Cited
US4841290A
Cited
US4839634A
Cited
US4845346A
Cited
US5070325A
Cited
EP0375328A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-14 | 1999-02-13 | 1999-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-14 | 2003-02-13 | 2003-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-14 | 2007-02-13 | 2007-08-15 | $7700.00 | Window Closed / Lapsed |