US4450440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction of an epid bar graph
Assignee: Philips North America LLC
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Filing: 1981-12-24
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Granted: 1984-05-22
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Expires: 2001-12-24
Abstract
Abstract An electrophoretic bar graph display is provided wherein the number of electrodes is significantly reduced. This occurs by application of one of three voltage values to each of a plurality of electrodes at one side of the display in accordance with the value to be displayed, and one of two voltage values to each of a number of electrodes at the other side of the display corresponding to each one of the plurality. The two voltage values alternate in value with the three voltage values. A cursor type display can also be provided having an indication segment of contrasting color from the remaining electrophoretic fluid.
Inventors
- 👤 Roger P. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:31
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/40; G01R13/404; G01R13/405
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
142 words
An electrophoretic bar graph display comprising two separated substrates with at least one substrate being transparent, an electrophoretic fluid having suspended pigment particles filling the space between said substrates, a first electrode structure formed on the surface of one of said substrates facing said fluid and a second electrode structure formed on a surface of the other of said substrates facing said fluid with at least one of said electrode structures being substantially transparent, said first electrode structure providing a plurality of electrodes and said second electrode structure providing an equal number of electrodes for each of said plurality of electrodes, means for providing at least one of three voltages to each of said first electrodes, and means for providing at least one of two voltages to each of said second electrodes, said two voltages alternating in value with said three voltages.
Claim 2
Dependent Claim
142 words
An electrophoretic bar graph display comprising two separated substrates with at least one substrate being transparent, an electrophoretic fluid having suspended pigment particles filling the space between said substrates, a first electrode structure formed on the surface of one of said substrates facing said fluid and a second electrode structure formed on a surface of the other of said substrates facing said fluid with at least one of said electrode structures being substantially transparent, said first electrode structure providing a plurality of electrodes and said second electrode structure providing an equal number of electrodes for each of said plurality of electrodes, means for providing at least one of three voltages to each of said first electrodes, and means for providing at least one of two voltages to each of said second electrodes, said two voltages alternating in value with said three voltages.
Claim 3
Dependent Claim
36 words
An electrophoretic bar graph display according to claim 1, wherein a scale structure is provided to indicate a position of said electrophoretic fluid in accordance with said voltages applied to said first and second electrode structures.
Claim 4
Dependent Claim
16 words
An electrophoretic bar graph display according to claim 2, wherein said bar graph display is elongated.
Claim 5
Dependent Claim
16 words
An electrophoretic bar graph display according to claim 2, wherein said bar graph display is curved.
Claim 6
Dependent Claim
16 words
An electrophoretic bar graph display according to claim 1, wherein said bar graph display is elongated.
Claim 7
Dependent Claim
16 words
An electrophoretic bar graph display according to claim 1, wherein said bar graph display is curved.
Claim 8
Dependent Claim
52 words
An electrophoretic bar graph display according to claim 1, wherein the number of electric leads to said bar graph display equals the number m of electrodes of said second electrode structure for each of said plurality of electrodes plus the number n of said plurality of electrodes of said first electrode structure.
Claim 9
Dependent Claim
180 words
An electrophoretic cursor type display comprising two separated substrates with at least one substrate being transparent, an electrophoretic fluid having suspended pigment particles filling the space between said substrates, a first electrode structure formed on the surface of one of said substrates facing said fluid and a second electrode structure formed on a surface of the other of said substrates facing said fluid with at least one of said electrode structures being substantially transparent, said first electrode structure providing a plurality of electrodes and said second electrode structure providing an equal number of electrodes for each of said plurality of electrodes, means for providing at least one of two voltages to each of said first electrodes, and means for providing at least one of two different voltages to each of said second electrodes, said two different voltages alternating in value with said two voltages provided to each of said first electrodes, wherein only a segment of said electrophoretic fluid is seen with a contrasting color from remaining portions of said electrophoretic fluid, said segment being provided at an indicating position.
Claim 10
Dependent Claim
180 words
An electrophoretic cursor type display comprising two separated substrates with at least one substrate being transparent, an electrophoretic fluid having suspended pigment particles filling the space between said substrates, a first electrode structure formed on the surface of one of said substrates facing said fluid and a second electrode structure formed on a surface of the other of said substrates facing said fluid with at least one of said electrode structures being substantially transparent, said first electrode structure providing a plurality of electrodes and said second electrode structure providing an equal number of electrodes for each of said plurality of electrodes, means for providing at least one of two voltages to each of said first electrodes, and means for providing at least one of two different voltages to each of said second electrodes, said two different voltages alternating in value with said two voltages provided to each of said first electrodes, wherein only a segment of said electrophoretic fluid is seen with a contrasting color from remaining portions of said electrophoretic fluid, said segment being provided at an indicating position.
Claim 11
Dependent Claim
33 words
An electrophoretic cursor type display according to claim 8, wherein a scale structure is provided to locate said indicating position in accordance with said voltages applied to said first and second electrode structures.
Claim 12
Dependent Claim
15 words
An electrophoretic cursor type display according to claim 8, wherein said cursor display is elongated.
Claim 13
Dependent Claim
15 words
An electrophoretic cursor type display according to claim 8, wherein said cursor display is curved.
Claim 14
Dependent Claim
51 words
An electrophoretic cursor type display according to claim 8, wherein the number of electrical leads to said cursor display equals the number m of electrodes of said second electrode structure for each of said plurality of electrodes plus the number n of said plurality of electrodes of said first electrode structure.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |