US3634614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared-energized visual displays using up-converting phosphor
Assignee: AT&T Inc
•
Filing: 1969-04-16
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Granted: 1972-01-11
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Expires: 1989-04-16
Abstract
Abstract A color pictorial display is produced by scanning a phosphor layer with a frequency and/or amplitude-modulated infrared beam. Visible emission results by virtue of a two-photon or high-order multiphoton process.
Inventors
- 👤 Joseph E Geusic
- 👤 Le Grand G Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:45
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3129; G; G02; G02F; G02F2/00; G02F2/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
131 words
A system for producing a visible video display comprising a phosphor layer containing at least one activator ion, said phosphor layer being capable of emitting at least two visible wavelengths, each of the at least two wavelengths being of an amplitude discernible to unaided human vision when said phosphor layer is energized by radiation within the infrared spectrum; a source of infrared radiation incident upon said phosphor layer; a source of a video signal; means responsive to said video signal for modulating a characteristic of said incident infrared radiations to produce selection between and amplitude modulation of the at least two visible wavelengths of radiation emitted by said phosphor layer as a function of the variation in said video signal; and means for scanning said phosphor layer with said infrared radiation.
Claim 2
Independent Claim
131 words
A system for producing a visible video display comprising a phosphor layer containing at least one activator ion, said phosphor layer being capable of emitting at least two visible wavelengths, each of the at least two wavelengths being of an amplitude discernible to unaided human vision when said phosphor layer is energized by radiation within the infrared spectrum; a source of infrared radiation incident upon said phosphor layer; a source of a video signal; means responsive to said video signal for modulating a characteristic of said incident infrared radiations to produce selection between and amplitude modulation of the at least two visible wavelengths of radiation emitted by said phosphor layer as a function of the variation in said video signal; and means for scanning said phosphor layer with said infrared radiation.
Claim 3
Dependent Claim
24 words
System of claim 1 in which apparent selection between two said wavelengths of visible radiation is dependent upon a characteristic of said infrared radiation.
Claim 4
Dependent Claim
11 words
System of claim 2 in which a said characteristic is amplitude.
Claim 5
Dependent Claim
24 words
System of claim 3 in which the two said wavelengths of visible radiation result from different multiphoton processes associated with a single activator ion.
Claim 6
Dependent Claim
12 words
System of claim 4 in which the said ion is Er3 .
Claim 7
Dependent Claim
11 words
System of claim 2 in which a said characteristic is frequency.
Claim 8
Dependent Claim
56 words
System of claim 6 in which the said phosphor consists essentially of a mechanical admixture of at least two distinct compounds each containing at least one exclusive activator ion, and in which variation in frequency of the said infrared radiation results in selective absorption and consequent selective emission within a given member of the admixed compounds.
Claim 9
Dependent Claim
12 words
System of claim 1 in which the said infrared radiation is coherent.
Claim 10
Dependent Claim
14 words
System of claim 8 in which the radiation source is at least one laser.
Claim 11
Dependent Claim
25 words
System of claim 9 in which the laser output is controlled by at least one element interposed between the said laser and the said phosphor.
Claim 12
Dependent Claim
15 words
System of claim 10 in which one of the said elements is an amplitude modulator.
Claim 13
Dependent Claim
15 words
System of claim 11 in which the said modulator is dependent upon an electro-optic interaction.
Claim 14
Dependent Claim
15 words
System of claim 10 in which one of the said elements is a parametric oscillator.
Claim 15
Dependent Claim
12 words
System of claim 1 in which the said infrared source is incoherent.
Claim 16
Dependent Claim
30 words
System of claim 14 in which the said incoherent source is at least one gallium arsenide infrared emitting diode and in which means is provided for forward biasing said diode.
Claim 17
Dependent Claim
20 words
System of claim 15 in which said source includes at least two diodes with peak emission at different infrared wavelengths.
References Cited (Backward Citations)
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |