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US3706845A
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Method of improving the {65 {40 of a cathodochromic display device
Assignee: RCA Licensing Corp
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Filing: 1970-10-08
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Granted: 1972-12-19
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Expires: 1990-10-08
Abstract
Abstract Operation of a cathodochromic display tube by steps including destabilizing the color centers for the optically reversible coloration component of the cathodochromic material. Such destabilizing excludes at least partially the optically reversible coloration components before the image-formation process. Destabilization can be achieved by heating the cathodochromic material to a temperature at least equal to the partial erase temperature but below the total erase temperature of the cathodochromic material, and/or by exposing the cathodochromic material material to radiation of suitable wavelength.
Inventors
- 👤 Philip Michael Heyman
- 👤 Istvan Gorog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
The method defined in claim 1, wherein said destabilizing of said color centers is achieved by heating said cathodochromic material to an elevated temperature at least equal to the partial erase temperature thereof but below the total erase temperature of said cathodochromic material, whereby substantially all coloration contribution from said optically reversible coloration component is excluded at the start of said writing step.
Claim 2
Dependent Claim
30 words
The method defined in claim 2, wherein said cathodochromic material is sodalite and said partial erase temperature is about 100* to 150*C. and said total erase temperature is about 200*C.
Claim 3
Dependent Claim
32 words
The method defined in claim 2, wherein said cathodochromic material is cooled below said partial erase temperature during said writing, whereby some of said destabilized color centers achieve a substantially stable state.
Claim 4
Dependent Claim
28 words
The method defined in claim 1, wherein said destabilization of said portion of said color centers is achieved by directing radiation of suitable wavelength onto said cathodochromic material.
Claim 5
Dependent Claim
30 words
The method defined in claim 5, wherein said cathodochromic material is sodalite and said destabilization is attained by exposing said sodalite to radiation having a wavelength of about 5,550 A.
Claim 6
Dependent Claim
36 words
The method defined in claim 1 wherein said destabilizing step comprises heating said cathodochromic material to the total erase temperature thereof, and wherein said restabilizing step comprises cooling said material down from said total erase temperature.
Claim 7
Independent Claim
130 words
A method of operating a display device including a screen comprising a layer of cathodochromic material, said cathodochromic material being colorable by electron impingement thereon, the coloration comprising two coloration components, a first one of said components being optically reversible and a second one thereof being optically irreversible, said method comprising: a. destabilizing at least a portion of the color centers of said optically reversible coloration component by directing radiation of suitable wavelength onto said cathodochromic material, said radiant energy having a certain intensity level; b. writing information on said cathodochromic material; and c. improving the linearity of response achievable by said writing step by lowering said intensity of said radiation during said writing, whereby certain ones of said destabilized color centers achieve a substantially stable state during said writing.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |