US4152626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation for half selection in a drive system for a thin-film EL display
Assignee: Sharp Corp
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Filing: 1977-08-31
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Granted: 1979-05-01
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Expires: 1997-08-31
Abstract
Abstract A drive system is provided for a thin-film EL display panel which includes and EL thin layer sandwiched between a pair of dielectric layers, a plurality of scanning line electrodes formed on one of the dielectric layers, and a plurality of data line electrodes formed on the other of the dielectric layers. The scanning line electrodes and the data line electrodes, in combination, define a matrix pattern. Scanning pulses are sequentially applied to the scanning line electrodes, and a data sugnal is applied to the data line electrode which includes a selected picture point where the data line electrode crosses the scanning line electrode which is receiving the scanning pulse. Scanning line electrodes which are not receiving the scanning pulse are connected to receive a voltage signal of which a level is below the threshold level of the light emission.
Inventors
- 👤 Tadashi Hatta
- 👤 Matsuhiko Hirano
- 👤 Sumio Kita
- 👤 Shinobu Shiotani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:28
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/30
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
197 words
A drive system for a thin-film EL matrix display panel, said panel including a thin-film EL matrix display panel, said panel including a thin-film EL element sandwiched between a pair of dielectric layers, a set of scanning electrodes formed on one of said dielectric layers, and a set of data electrodes formed on the other of said dielectric layers, comprising: means for sequentially applying a scanning pulse to said set of scanning electrodes; means for applying a data signal to a data electrode simultaneously with said application of said scanning pulses to said scanning electrodes said data signal being continually applied to said data electrode during said application of said scanning pulses to said set of scanning electrodes within a single frame; means for applying half-selection-compensation voltage signals to said electrodes which are not receiving a said scanning pulse simultaneously with said application of said scanning pulses to said scanning electrodes; and means responsive to the completion of said application of said scanning pulse to said set of scanning electrodes within said single frame, for applying a field-refresh pulse to all of said data electrodes and concurrently applying a ground potential to all of said scanning electrodes.
Claim 2
Dependent Claim
197 words
A drive system for a thin-film EL matrix display panel, said panel including a thin-film EL matrix display panel, said panel including a thin-film EL element sandwiched between a pair of dielectric layers, a set of scanning electrodes formed on one of said dielectric layers, and a set of data electrodes formed on the other of said dielectric layers, comprising: means for sequentially applying a scanning pulse to said set of scanning electrodes; means for applying a data signal to a data electrode simultaneously with said application of said scanning pulses to said scanning electrodes said data signal being continually applied to said data electrode during said application of said scanning pulses to said set of scanning electrodes within a single frame; means for applying half-selection-compensation voltage signals to said electrodes which are not receiving a said scanning pulse simultaneously with said application of said scanning pulses to said scanning electrodes; and means responsive to the completion of said application of said scanning pulse to said set of scanning electrodes within said single frame, for applying a field-refresh pulse to all of said data electrodes and concurrently applying a ground potential to all of said scanning electrodes.
Claim 3
Dependent Claim
25 words
The drive system of claim 1, wherein said half-selection-compensation voltage signals have an amplitude below a threshold level of electroluminescence of said thin-film EL element.
Claim 4
Dependent Claim
41 words
The drive system of claim 2, wherein said scanning pulse has an amplitude higher than said threshold level of the electroluminescence of said thin-film EL element, and said half-selection-compensation voltage signals have a half amplitude of that of said scanning pulse.
Claim 5
Dependent Claim
25 words
The drive system of claim 1, wherein the application of said half-selection-compensation voltage signals is timed in agreement with the application of said scanning pulse.
Claim 6
Dependent Claim
14 words
The drive system of claim 4, wherein said data signal is of ground potential.
Claim 7
Dependent Claim
23 words
The drive system of claim 5, wherein the data electrodes not selected to receive said data signal are placed in an opened condition.
Claim 8
Dependent Claim
36 words
The drive system of claim 1, which further comprises means for applying a field refresh pulse to the entire picture points of said thin-film EL matrix display panel after completion of a scan of one frame.
Claim 9
Dependent Claim
43 words
The drive system of claim 7, wherein said field refresh pulse has the same amplitude as said scanning pulse, and said field refresh pulse is applied to said thin-film EL matrix display panel in a counter direction to that of said scanning pulse.
Claim 10
Dependent Claim
146 words
A drive system for a thin-film EL display panel, said panel including a thin-film EL element sandwiched between a pair of dielectric layers, a set of selection electrodes formed on one of said dielectric layers, and a set of counter electrodes formed on the other dielectric layer, comprising: means for sequentially applying a timing pulse to said counter electrodes; means for applying a data signal to a selected selection electrode including a picture point to be selected associated with a counter electrode which is receiving said timing pulse; means for applying voltage signals to said counter electrodes which are not receiving said timing pulse; and means responsive to the completion of said application of said timing pulse to said set of counter electrodes for applying a field-refresh pulse to all of said selection electrodes and concurrently applying a ground potential to all of said counter electrodes.
Claim 11
Dependent Claim
146 words
A drive system for a thin-film EL display panel, said panel including a thin-film EL element sandwiched between a pair of dielectric layers, a set of selection electrodes formed on one of said dielectric layers, and a set of counter electrodes formed on the other dielectric layer, comprising: means for sequentially applying a timing pulse to said counter electrodes; means for applying a data signal to a selected selection electrode including a picture point to be selected associated with a counter electrode which is receiving said timing pulse; means for applying voltage signals to said counter electrodes which are not receiving said timing pulse; and means responsive to the completion of said application of said timing pulse to said set of counter electrodes for applying a field-refresh pulse to all of said selection electrodes and concurrently applying a ground potential to all of said counter electrodes.
Claim 12
Dependent Claim
45 words
The drive system of claim 9, wherein said timing pulse has an amplitude higher than the threshold level of electroluminescence of said thin-film EL element, and said voltage signals have an amplitude less than the threshold level of the electroluminescence of said thin-film EL element.
Claim 13
Dependent Claim
172 words
A drive system for a thin-film EL matrix display panel in accordance with claim 1 wherein said means for sequentially applying a scanning pulse to said set scanning electrodes comprises: a first series of cascaded circuit means, having inputs and outputs, said input of each of said first cascaded circuit means being responsive to a scanning signal, and said output of each of said first cascaded circuit means being connected to one of said scanning electrodes; a second circuit means having an output and interconnected to said series of first cascaded circuit means; said output of said second circuit means being connected to a supply source for said scanning pulse; said series of first cascaded circuit means and said second circuit means being interconnected to transfer said scanning pulse from said output of said second circuit means to an output of one of said series of first cascaded circuit means in response to an application of said scanning signal at said input of said one of said series of cascaded circuit means.
Claim 14
Dependent Claim
90 words
A drive system for a thin-film EL matrix display panel in accordance with claim 11 wherein said means for applying half-selection-compensation voltage signals to said scanning electrodes which are not receiving said scanning pulse comprises: a third circuit means having an output and interconnected to said first series of cascaded circuit means and said second circuit means to transfer said half-selection-compensation voltage signal from said output of said third circuit means to all of said outputs of said first series of cascaded circuit means, not occupied by said scanning pulse.
Claim 15
Dependent Claim
151 words
A drive system for a thin-film EL matrix display panel in accordance with claim 12 wherein said means for applying a data signal to a single data electrode comprises: a second series of cascaded circuit means having inputs and outputs, each said input of said second cascaded circuit means being responsive to data signals and each said output of said second cascaded circuit means being connected to a corresponding one of said data electrodes; said data signal being sequentially applied to each of said inputs of said second cascaded circuit means; said second series of cascaded circuit means transferring said data signal from one said input of said second cascaded circuit means to a corresponding said output of said second cascaded circuit means in response to said data signal, thereby supplying said data signal to said corresponding data electrode and maintaining said other, remaining data electrodes in an open circuit condition.
Claim 16
Dependent Claim
175 words
A drive system for a thin-film EL matrix display in accordance with claim 13 wherein said means for applying a field-refresh pulse to said data electrodes concurrently with the application of a ground potential to said scanning electrodes comprises: means for supplying a field-refresh signal; a fourth circuit means having an input and interconnected with said first series of cascaded circuit means; a fifth circuit means having an input and interconnected with said second series of cascaded circuit means; said inputs of said fourth and fifth circuit means being responsive to said field-refresh signal; said fourth circuit means comprising, means responsive to said field-refresh signal for applying a ground potential to all of said outputs of said first cascaded circuit means, thereby supplying said ground potential to all of said scanning electrodes, simultaneously; and said fifth circuit means comprising, means responsive to said field-refresh signal for applying a field-refresh pulse to all of said outputs of said second series of cascaded circuit means, thereby supplying said field-refresh pulse to all of said data electrodes, simultaneously.
Claim 17
Dependent Claim
185 words
A thin-film EL matrix display panel and drive system comprising: a glass substrate; a plurality of first transparent parallel line electrode means formed on said glass substrate; a first thin dielectric film formed on said transparent, parallel line electrodes; a thin-film electroluminescent layer having a threshold level of electroluminescence formed on said first thin dielectric layer; a second thin dielectric film formed on said electroluminescent layer; a plurality of second transparent parallel line electrode means formed on said second thin dielectric layer, wherein said first and second parallel line electrodes cross each other at right angles; said first parallel line electrode means comprising a set of data electrodes and said second parallel line electrode means comprising a set of scanning electrodes; means for sequentially applying a scanning pulse to said scanning electrodes; means for applying a data signal to a selected data electrode simultaneously with the application of said scanning pulse to said scanning electrodes; and means for applying half-selection-compensation voltage signals to said scanning electrodes which are not receiving said scanning pulse simultaneously with the application of said scanning pulse to said scanning electrodes.
Claim 18
Dependent Claim
185 words
A thin-film EL matrix display panel and drive system comprising: a glass substrate; a plurality of first transparent parallel line electrode means formed on said glass substrate; a first thin dielectric film formed on said transparent, parallel line electrodes; a thin-film electroluminescent layer having a threshold level of electroluminescence formed on said first thin dielectric layer; a second thin dielectric film formed on said electroluminescent layer; a plurality of second transparent parallel line electrode means formed on said second thin dielectric layer, wherein said first and second parallel line electrodes cross each other at right angles; said first parallel line electrode means comprising a set of data electrodes and said second parallel line electrode means comprising a set of scanning electrodes; means for sequentially applying a scanning pulse to said scanning electrodes; means for applying a data signal to a selected data electrode simultaneously with the application of said scanning pulse to said scanning electrodes; and means for applying half-selection-compensation voltage signals to said scanning electrodes which are not receiving said scanning pulse simultaneously with the application of said scanning pulse to said scanning electrodes.
Claim 19
Dependent Claim
63 words
A thin-film EL matrix display panel and drive system in accordance with claim 15 further comprising: means responsive to the completion of said application of said scanning pulse to said set of scanning electrodes within said single frame for applying a field-refresh pulse to all of said data electrodes concurrently with the application of a ground potential to all of said scanning electrodes.
Claim 20
Dependent Claim
29 words
The matrix display panel and drive system of claim 15 wherein said half-selection-compensation voltage signals have an amplitude below said threshold level of electroluminescence of said thin-film EL element.
Claim 21
Dependent Claim
45 words
The matrix display panel and drive system of claim 17 wherein said scanning pulse has an amplitude higher than said threshold level of the electroluminescence of said thin-film EL element, and said half-selection-compensation voltage signals have a half amplitude of that of said scanning pulse.
Claim 22
Dependent Claim
29 words
The matrix display panel and drive system of claim 15 wherein the application of said half-selection-compensation voltage signals is timed in agreement with the application of said scanning pulse.
Claim 23
Dependent Claim
18 words
The matrix display panel and drive system of claim 19 wherein said data signal is of ground potential.
Claim 24
Dependent Claim
27 words
The matrix display panel and drive system of claim 20 wherein the data electrodes not selected to receive said data signal are placed in an opened condition.
Claim 25
Dependent Claim
49 words
The matrix display panel and drive system of claim 15 wherein said scanning pulse has an amplitude higher than said threshold level of electroluminescence of said thin-film EL element, and said voltage signals have an amplitude less than said threshold level of the electroluminescence of said thin-film EL element.
Claim 26
Dependent Claim
171 words
The matrix display panel and drive system in accordance with claim 15 wherein said means for sequentially applying a scanning pulse to said set of scanning electrodes comprises: a first series of cascaded circuit means, having inputs and outputs, said input of each of said first cascaded circuit means being responsive to a scanning signal, and said output of each of said first cascaded circuit means being connected to one of said scanning electrodes; a second circuit means having an output and interconnected to said series of first cascaded circuit means; said output of said second circuit means being connected to a supply source for said scanning pulse; said series of first cascaded circuit means and said second circuit means being interconnected so as to transfer said scanning pulse from said output of said circuit means to an output of one of said series of first cascaded circuit means in response to an application of said scanning signal at said input of said one of said series of cascaded circuit means.
Claim 27
Dependent Claim
87 words
The matrix display panel and drive system in accordance with claim 23 wherein said means for applying half-selection-compensation voltage signals to said scanning electrodes which are not receiving said scanning pulse comprising: a third circuit means having an output and interconnected to said first series of cascaded circuit means and said second circuit means to transfer said half-selection-compensation voltage signal from said output of said third circuit means to all of said outputs of said first series of cascaded circuit means, not occupied by said scanning pulse.
Claim 28
Dependent Claim
148 words
The matrix display panel and drive system in accordance with claim 24 wherein said means for applying a data signal to a single data electrode comprises: a second series of cascaded circuit means having inputs and outputs, each said input of said second cascaded circuit means being responsive to data signals and each said output of said second cascaded circuit means being connected to a corresponding one of said data electrodes; said data signal being sequentially applied to each of said inputs of said second cascaded circuit means; said second series of cascaded circuit means transferring said data signal from one said input of said second cascaded circuit means to a corresponding said output of said second cascaded circuit means in response to said data signal, thereby supplying said data signal to said corresonding data electrode and maintaining said other, remaining data electrodes in an open circuit condition.
Claim 29
Dependent Claim
170 words
The matrix display panel and drive system in accordance with claim 16 wherein said means for sequentially applying a scanning pulse to said set of scanning electrodes comprises: a first series of cascaded circuit means having inputs and outputs, said input of each of said first cascaded circuit means being responsive to a scanning signal and said output of each of said first cascaded circuit means being connected to one of said scanning electrodes; a second circuit means having an output and interconnected to said series of first cascaded circuit means; said output of said second circuit means being connected to a supply source for said scanning pulse; said series of first cascaded circuit means and said second circuit means being interconnected to transfer said scanning pulse from said output of said second circuit means to an output of one of said series of first cascaded circuit means in response to an application of said scanning signal at said input of said one of said series of cascaded circuit means.
Claim 30
Dependent Claim
87 words
The matrix display panel and drive system in accordance with claim 26 wherein said means for applying half-selection-compensation voltage signals to said scanning electrodes which are not receiving said scanning pulse comprising: a third circuit means having an output and interconnected to said first series of cascaded circuit means and said second circuit means to transfer said half-selection-compensation voltage signal from said output of said third circuit means to all of said outputs of said first series of cascaded circuit means, not occupied by said scanning pulse.
Claim 31
Dependent Claim
147 words
The matrix display panel and drive system in accordance with claim 27 wherein said means for applying a data signal to a single data electrode comprises: a second series of cascaded circuit means having inputs and outputs, each said input of said second cascaded circuit means being responsive to data signals and each output of said second cascaded circuit means being connected to a corresponding one of said data electrodes; said data signal being sequentially applied to each of said inputs of said second cascaded circuit means; said second series of cascaded circuit means transferring said data signal from one said input of said second cascaded circuit means to a corresponding said output of said second cascaded circuit means in response to said data signal thereby supplying said data signal to said corresponding data electrode and maintaining said other, remaining data electrodes in an open circuit condition.
Claim 32
Dependent Claim
175 words
The matrix display panel and drive system in accordance with claim 28 wherein said means for applying a field-refresh pulse to said data electrodes concurrently with the application of a ground potential to said scanning electrodes comprises: means for supplying a field-refresh signal; a fourth circuit means having an input and interconnected with said first series of cascaded circuit means; a fifth circuit means having an input and interconnected with said second series of cascaded circuit means; said inputs of said fourth and fifth circuit means being responsive to said field-refresh signal; said fourth circuit means comprising, a means responsive to said field-refresh signal for applying a ground potential to all of said outputs of said first cascaded circuit means, thereby supplying said ground potential to all of said scanning electrodes, simultaneously; and said fifth circuit means comprising, a means responsive to said field-refresh signal for applying a field-refresh pulse to all of said outputs of said second series of cascaded circuit means, thereby supplying a field-refresh pulse to all of said data electrodes, simultaneously.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |