US4023890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-transmissive display device
Assignee: Citizen Watch Co Ltd
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Filing: 1975-07-31
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Granted: 1977-05-17
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Expires: 1995-07-31
Abstract
Abstract A digital display device for forming one or more electro-transmissive display patterns, which comprises a pair of oppositely disposed electrodes to which a signal is supplied for energization. Each of the electrodes includes a number of electro-conductive sections which are disposed with a lower distribution density at the central portion and with a higher distribution density at the contour portion. This mode of distribution of the sections gives an equivalent visual contrast to the situations in which all the sections are disposed with a uniform distribution while at the same time reducing the power consumption rate.
Inventors
- 👤 Shinichi Shirasu
- 👤 Yasushi Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134327
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
In a display device of the light transmitting type, wherein the device includes at least one pattern having a periphery and central portion within the periphery; first and second substrates of insulating material having inner surfaces facing one another. a layer of light transmitting material disposed between the substrates; a plurality of segment electrodes deposited on the inner surface of the first substrate between the first substrate and the layer of light transmitting material wherein each segment electrode contains the pattern having a periphery and central portion; a common electrode deposited on the inner surface of the second substrate between the second substrate and the layer of light transmitting material; and a plurality of electro-conductive sections forming segment electrodes, wherein said sections adjacent the periphery have a higher distribution density than those forming the central portions, so that the periphery of the pattern is brighter than the central portion and the pattern has the same visual impact as a pattern with a constant distribution density.
Claim 2
Dependent Claim
165 words
In a display device of the light transmitting type, wherein the device includes at least one pattern having a periphery and central portion within the periphery; first and second substrates of insulating material having inner surfaces facing one another. a layer of light transmitting material disposed between the substrates; a plurality of segment electrodes deposited on the inner surface of the first substrate between the first substrate and the layer of light transmitting material wherein each segment electrode contains the pattern having a periphery and central portion; a common electrode deposited on the inner surface of the second substrate between the second substrate and the layer of light transmitting material; and a plurality of electro-conductive sections forming segment electrodes, wherein said sections adjacent the periphery have a higher distribution density than those forming the central portions, so that the periphery of the pattern is brighter than the central portion and the pattern has the same visual impact as a pattern with a constant distribution density.
Claim 3
Dependent Claim
18 words
A display device, as claimed in claim 1, wherein said light transmitting substance is an electrochromatic display element.
Claim 4
Dependent Claim
17 words
A display device, as claimed in claim 1, wherein said light transmitting substance is liquid crystal material.
Claim 5
Dependent Claim
22 words
A display device as claimed in claim 1, wherein the distribution density gradually decreases toward said central part from said contour part.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |