US5412397A
Expired / Lapsed
US
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Driving circuit for a matrix type display device
Assignee: Sharp Corp
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Filing: 1994-01-03
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Granted: 1995-05-02
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Expires: 2014-01-03
Abstract
Abstract A driving circuit for a matrix type liquid crystal display device is disclosed. The driving circuit comprises: a gate driver for, during a writing period, selectively driving a scanning line included in a group of scanning lines which correspond to the field to be scanned, and for, during an erasing period, selectively driving a scanning line included in another group of scanning lines which do not correspond to the field to be scanned; a source driver for, during said writing period of an even field, applying a signal voltage the level of which corresponds to a video signal, to the signal lines, and for, during the erasing period, applying a voltage to the signal lines to set the voltage applied to the picture elements to a level below the threshold level of the picture elements; and another source driver for, during said writing period of an odd field, applying a signal voltage the level of which corresponds to a video signal, to the signal lines, and for, during the erasing period, applying a voltage to the signal lines to set the voltage applied to the picture elements to a level below the threshold level of the picture elements. The writing period and the erasing period shares one horizontal scanning period.
Inventors
- 👤 Yoshiharu Kanatani
- 👤 Hirofumi Fukuoka
- 👤 Yoshihiko Orii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:10
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3688; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0224; G09G2310/0264; G09G2310/0297
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
329 words
In a driving circuit for a matrix type display device which comprises picture elements arranged in a matrix suited for an interlaced scanning method, switching elements connected respectively to said picture elements, scanning lines each of which is connected to a switching terminal of said switching elements which are arranged in one direction, and signal lines each of which is connected to a signal terminal of said switching elements which are arranged in a direction crossing said one direction, said driving circuit comprises: a first driving means for, during a writing period in a previous half of each horizontal scanning period, selecting a scanning line included in a group of said scanning lines which correspond to a field to be scanned, and for, during an erasing period in a late half of each,of the horizontal scanning periods selecting another scanning line which is adjacent to said selected scanning line and is included in another group of scanning lines which do not correspond to the field to be scanned, said writing period for said selected scanning line and said erasing period for said another scanning line sharing one horizontal scanning period respectively with a pulse in said one horizontal scanning period of each field; a second driving means for, during said writing period in a writing field corresponding to the field to be scanned, applying to said signal lines a signal voltage above a threshold level of said picture elements determined by the liquid crystal's characteristics referenced to a voltage applied to a counter electrode, the level of said signal voltage corresponding to a video signal, and a third driving means for, during said erasing period, applying one voltage to said signal lines to set the voltage applied to said picture elements to a level below the threshold level of said picture elements referenced to a voltage applied to a counter electrode, each of said signal lines being connected to both said second driving means and said third driving means.
Claim 2
Dependent Claim
329 words
In a driving circuit for a matrix type display device which comprises picture elements arranged in a matrix suited for an interlaced scanning method, switching elements connected respectively to said picture elements, scanning lines each of which is connected to a switching terminal of said switching elements which are arranged in one direction, and signal lines each of which is connected to a signal terminal of said switching elements which are arranged in a direction crossing said one direction, said driving circuit comprises: a first driving means for, during a writing period in a previous half of each horizontal scanning period, selecting a scanning line included in a group of said scanning lines which correspond to a field to be scanned, and for, during an erasing period in a late half of each,of the horizontal scanning periods selecting another scanning line which is adjacent to said selected scanning line and is included in another group of scanning lines which do not correspond to the field to be scanned, said writing period for said selected scanning line and said erasing period for said another scanning line sharing one horizontal scanning period respectively with a pulse in said one horizontal scanning period of each field; a second driving means for, during said writing period in a writing field corresponding to the field to be scanned, applying to said signal lines a signal voltage above a threshold level of said picture elements determined by the liquid crystal's characteristics referenced to a voltage applied to a counter electrode, the level of said signal voltage corresponding to a video signal, and a third driving means for, during said erasing period, applying one voltage to said signal lines to set the voltage applied to said picture elements to a level below the threshold level of said picture elements referenced to a voltage applied to a counter electrode, each of said signal lines being connected to both said second driving means and said third driving means.
Claim 3
Dependent Claim
14 words
A driving circuit according to claim 1, wherein said picture elements comprises liquid crystal.
Claim 4
Dependent Claim
15 words
A driving circuit according to claim 1, wherein said switching elements are thin film transistors.
Claim 5
Dependent Claim
30 words
A driving circuit according to claim 3, wherein said switching terminal is a gate of said thin film transistors, and said signal terminal a source of said thin film transistors.
Claim 6
Dependent Claim
202 words
A driving circuit for a matrix type display device according to claim 1, wherein said scanning lines are grouped into odd lines and even lines, a signal voltage for an odd field being applied to switching elements connected to said odd scanning lines, and a signal voltage for an even field being applied to switching elements connected to said even scanning lines, and wherein said second driving means applies, to switching elements connected to said odd scanning lines through signal lines, a signal voltage for one frame which is constituted by a period for applying a voltage corresponding to said signal voltage for said odd field and another period applying a voltage having a level lower than said threshold level referenced to a voltage applied to a counter electrode for said even field, in this order; and said third driving means applies, to switching elements connected to said even scanning lines through said signal lines, a signal voltage for said frame which is constituted by a period for applying a voltage having a level lower than said threshold level for said odd field and another period for applying a voltage corresponding to said signal voltage for said even field, in this order.
Claim 7
Dependent Claim
43 words
A driving circuit for a matrix type display device according to claim 5, wherein a writing pulse is applied during said writing period in one horizontal scanning period, and an erasing pulse is applied during said erasing period in one horizontal scanning period.
Claim 8
Dependent Claim
297 words
In a driving circuit for a matrix type display device which device comprises picture elements arranged in a matrix, switching elements connected respectively to said picture elements, scanning lines each of which is connected to a switching terminal of switching elements which are arranged in one direction, and signal lines each of which is connected to a signal terminal of switching elements which are arranged in a direction crossing said one direction, said driving circuit comprises: a first driving means for, during a writing period, selecting a scanning line included in a group of scanning lines which correspond to a field to be scanned, and for, during an erasing period, selecting another scanning line which is adjacent to said selected scanning line and is included in another group of scanning lines which do not correspond to the field to be scanned, said writing period and said erasing period sharing one horizontal scanning period and said erasing period being later than said writing period; a second driving means for, during said writing period in said field corresponding to the field to be scanned, applying a signal voltage above a threshold level of said picture elements, the level of which corresponds to a video signal referenced to a voltage applied to a counter electrode, to said signal lines; and a third driving means for, during the erasing period which is later than said writing period by a time period substantially equal to said writing period, applying one voltage to said signal lines to set the voltage applied to said picture elements to a level below the threshold level of said picture elements referenced to a voltage applied to a counter electrode, each of said signal lines being connected to both said second driving means and said third driving means.
Claim 9
Dependent Claim
297 words
In a driving circuit for a matrix type display device which device comprises picture elements arranged in a matrix, switching elements connected respectively to said picture elements, scanning lines each of which is connected to a switching terminal of switching elements which are arranged in one direction, and signal lines each of which is connected to a signal terminal of switching elements which are arranged in a direction crossing said one direction, said driving circuit comprises: a first driving means for, during a writing period, selecting a scanning line included in a group of scanning lines which correspond to a field to be scanned, and for, during an erasing period, selecting another scanning line which is adjacent to said selected scanning line and is included in another group of scanning lines which do not correspond to the field to be scanned, said writing period and said erasing period sharing one horizontal scanning period and said erasing period being later than said writing period; a second driving means for, during said writing period in said field corresponding to the field to be scanned, applying a signal voltage above a threshold level of said picture elements, the level of which corresponds to a video signal referenced to a voltage applied to a counter electrode, to said signal lines; and a third driving means for, during the erasing period which is later than said writing period by a time period substantially equal to said writing period, applying one voltage to said signal lines to set the voltage applied to said picture elements to a level below the threshold level of said picture elements referenced to a voltage applied to a counter electrode, each of said signal lines being connected to both said second driving means and said third driving means.
References Cited (Backward Citations)
US4158860A
Cited
US4481511A
Cited
US4602292A
Cited
DE3702335A1
Cited
US4789899A
Cited
US4842371A
Cited
US4908710A
Cited
EP0313876A2
Cited
EP0373897A2
Cited
EP0552858A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-05-01 | 1998-10-31 | 1999-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-01 | 2002-10-31 | 2003-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-01 | 2006-10-31 | 2007-05-02 | $7700.00 | Window Closed / Lapsed |