US3680049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device and method for scanning said device
Assignee: Hitachi Ltd
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Filing: 1970-09-08
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Granted: 1972-07-25
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Expires: 1990-09-08
Abstract
Abstract A display device comprising a number of light emitting diodes disposed in a matrix array, a switching element being connected in series with each of the horizontal (row) and the vertical (column) scanning lines; said array being scanned in such a manner that the column lines are scanned with a pulse consisting of a negative part and a subsequent positive part while the row lines which are always biased with a negative voltage of a value smaller than that of the said negative part of the column scanning pulse are scanned with a negative pulse of a value larger than that of the said negative part of the column scanning pulse, a trigger pulse being applied to the gate electrode of the switching elements in synchronization with the column scanning pulse for a column which includes a light emitting diode to be energized, thus a light emitting diode which has been transferred to a conductive state being returned to the non-conductive state by the negative part of the column scanning pulse just before the relevant column is scanned for the second time, a bright display being thereby ensured.
Inventors
- 👤 Toshihisa Tsukada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:30
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/30; G09G3/32; H; H04; H04N; H04N3/00; H04N3/10; H04N3/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A display device comprising a light emitter array having a plurality of light emitting diodes disposed in a matrix array, a plurality of terminals each assigned to each of the rows and columns of the array, a plurality of elements having switching characteristics each assigned to each row of said array with the anode thereof connected with the cathode of every light emitting diode in the row and the cathode thereof connected with the terminal of the row, a plurality of elements having switching characteristics each assigned to each column of said array with the cathode thereof connected with the anode of every light emitting diode in the column and the anode thereof connected with the terminal of the column, and a gate terminal connected with the control terminals of all of said elements having switching characteristics.
Claim 2
Dependent Claim
137 words
A display device comprising a light emitter array having a plurality of light emitting diodes disposed in a matrix array, a plurality of terminals each assigned to each of the rows and columns of the array, a plurality of elements having switching characteristics each assigned to each row of said array with the anode thereof connected with the cathode of every light emitting diode in the row and the cathode thereof connected with the terminal of the row, a plurality of elements having switching characteristics each assigned to each column of said array with the cathode thereof connected with the anode of every light emitting diode in the column and the anode thereof connected with the terminal of the column, and a gate terminal connected with the control terminals of all of said elements having switching characteristics.
Claim 3
Dependent Claim
96 words
A display device comprising a light emitter array having a plurality of light emitting elements that have switching characteristics, said elements being disposed in a matrix array, a plurality of terminals each assigned to each row of said array and each connected with the cathode of every light emitting element in the row, a plurality of terminals each assigned to each column of said array and each connected with the anode of every light emitting element in the column, and a gate terminal connected with the control terminal of very light emitting element in the array.
Claim 4
Dependent Claim
96 words
A display device comprising a light emitter array having a plurality of light emitting elements that have switching characteristics, said elements being disposed in a matrix array, a plurality of terminals each assigned to each row of said array and each connected with the cathode of every light emitting element in the row, a plurality of terminals each assigned to each column of said array and each connected with the anode of every light emitting element in the column, and a gate terminal connected with the control terminal of very light emitting element in the array.
Claim 5
Dependent Claim
167 words
A method for scanning the display device as defined in claim 1, characterized in that the column terminals are scanned with a pulse consisting of a starting negative part and a subsequent positive part, while the row terminals are normally provided with a negative voltage which is less negative than said negative part of the column scanning pulse, but a row terminal which is being scanned is provided with a negative voltage which is more negative than said negative part of the column scanning pulse if a light emitting element to be eneRgized is connected with said row terminal, and a trigger pulse is applied to said gate terminal in synchronization with a column scanning pulse applied to the column terminal connected with the light emitting element to be energized, so that a light emitting element which has been turned to conductive is returned to the non-conductive state before the column terminal with which said conducting light emitting element is connected is scanned for the next time.
Claim 6
Dependent Claim
167 words
A method for scanning the display device as defined in claim 2, characterized in that the column terminals are scanned with a pulse consisting of a starting negative part and a subsequent positive part, while the row terminals are normally provided with a negative voltage which is less negative than said negative part of the column scanning pulse, but a row terminal which is being scanned is provided with a negative voltage which is more negative than said negative part of the column scanning pulse if a light emitting element to be energized is connected with said row terminal, and a trigger pulse is applied to said gate terminal in synchronization with a column scanning pulse applied to the column terminal connected with the light emitting element to be energized, so that a light emitting element which has been turned to conductive is returned to the non-conductive state before the column terminal with which said conducting light emitting element is connected is scanned for the next time.
Claim 7
Dependent Claim
168 words
A method for scanning the display device as defined in claim 2, characterized in that the potential of the column terminals is normally set at zero level, but a positive pulse is applied to a column terminal during the scanning period for the column if a light emitting element to be energized is connected with the column terminal, while the row terminals are normally provided with a constant negative voltage which is sufficient for maintaining a triggered light emitting element in the conductive state, the row terminals being scanned with a pulse which includes a positive part not lower than the column scanning pulse and a subsequent negative part, and a trigger pulse is applied to said gate terminal in synchronization with a column scanning pulse applied to the column terminal connected with the light emitting element which has been turned to conductive is returned to the non-conductive state before the column terminal with which said conducting light emitting element is connected is scanned for the next time.
References Cited (Backward Citations)
US3397388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |