US3699374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light activated, high resolution, field sustained conductivity image storage and display device
Assignee: Raytheon Co
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Filing: 1971-07-15
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Granted: 1972-10-17
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Expires: 1991-07-15
Abstract
Abstract This invention provides a solid state image-storage panel, in the form of a multi-layered thin film structure, which can exhibit and retain a high resolution image momentarily impressed thereupon by light. The image can either be projected on the panel in entirety or can be recorded sequentially by a scanning light beam. The intensity of light impinging on an elemental area of the image-storage panel creates local conductivity modulations within the storage film thereof which correspond to the input image. These modulations, in turn, alter local field configurations across an electroluminescent layer disposed adjacent the storage film, thus creating a visible output image. After initial exposure, the conductivity modulations in the storage film are maintained for an extended period of time (several tens of seconds) provided that an applied electric field across the storage film continues to be maintained. This phenomenon is hereinafter referred to as ''''field sustained conductivity.'''' Removal or reversal of the applied electrical field restores the storage film to its initial insulating condition, and the image-storage panel is thereby erased.
Inventors
- 👤 Ronald F Scholl
- 👤 William P Bleha Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:35
CPC Classifications
G; G11; G11C; G11C27/00; H; H10; H10F; H10F55/00; H10F55/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
A light activated, high resolution field sustained conductivity image storage and display panel comprising: a. an optically transparent substrate; b. a bottom electrode constituting a transparent conductive coating on one side of said substrate; c. an electroluminescent layer disposed over said transparent conductive coating; d. a light opaque layer disposed over said electroluminescent layer, said light opaque layer having a high resistance in directions parallel to the surface of said substrate; e. a layer of cadmium sulfide disposed over said light opaque layer, said layer of cadmium sulfide being heated at a temperature of from 385* to 525*C. for a period of from one minute to one hour in a non-sulfur-containing atmosphere followed by cooling in said atmosphere; f. an electrode member in the form of a composite layer of two materials which have diverse conducting properties disposed on said heat treated layer of cadmium sulfide; g. an upper electrode constituting a transparent conductive film disposed over said composite layer; h. a transparent cover disposed over said top electrode and hermetically sealed to said substrate; and i. means for applying a dc bias voltage across said bottom and upper electrodes.
Claim 2
Dependent Claim
190 words
A light activated, high resolution field sustained conductivity image storage and display panel comprising: a. an optically transparent substrate; b. a bottom electrode constituting a transparent conductive coating on one side of said substrate; c. an electroluminescent layer disposed over said transparent conductive coating; d. a light opaque layer disposed over said electroluminescent layer, said light opaque layer having a high resistance in directions parallel to the surface of said substrate; e. a layer of cadmium sulfide disposed over said light opaque layer, said layer of cadmium sulfide being heated at a temperature of from 385* to 525*C. for a period of from one minute to one hour in a non-sulfur-containing atmosphere followed by cooling in said atmosphere; f. an electrode member in the form of a composite layer of two materials which have diverse conducting properties disposed on said heat treated layer of cadmium sulfide; g. an upper electrode constituting a transparent conductive film disposed over said composite layer; h. a transparent cover disposed over said top electrode and hermetically sealed to said substrate; and i. means for applying a dc bias voltage across said bottom and upper electrodes.
Claim 3
Dependent Claim
35 words
The invention according to claim 1 wherein said non-sulfur-containing atmosphere in which said layer of cadmium sulfide is heated is a gas selected from a group of gases consisting essentially of argon, nitrogen and air.
Claim 4
Dependent Claim
51 words
The invention according to claim 1 wherein said composite layer of two materials which have diverse conducting properties constitutes a composite film of a metal selected from a group consisting of gold, aluminum, silver, platinum and tin and a dielectric selected from a group consisting of silicon monoxide and magnesium oxide.
Claim 5
Dependent Claim
40 words
The invention according to claim 1 wherein said composite layer of two materials which have diverse conducting properties constitutes a composite film of a semiconductor material and a dielectric selected from a group consisting of silicon monoxide and magnesium oxide.
Claim 6
Dependent Claim
12 words
The invention according to claim 4 wherein said semiconductor material is germanium.
Claim 7
Dependent Claim
180 words
A light activated, high resolution field sustained conductivity image storage and display panel comprising: a. an optically transparent planar substrate; b. a bottom electrode constituting a transparent conductive coating on one side of said substrate; c. a phosphor layer capable of having its luminescence modulated in response to an electrical field established thereacross disposed over said bottom electrode; d. a light opaque layer disposed over said phosphor layer, said light opaque layer having a high resistance in directions parallEl to the surface of said planar substrate; e. a layer of cadmium sulfide disposed over said light opaque layer, said layer of cadmium sulfide being from 2 to 15 microns thick; f. an electrode member in the form of a composite layer of two materials which have diverse conducting properties disposed on said layer of cadmium sulfide; g. an upper electrode constituting a transparent conductive film disposed over said composite layer; h. a transparent cover disposed over said top electrode and hermetically sealed to said substrate; and i. means for applying a dc bias voltage across said bottom and upper electrodes.
Claim 8
Dependent Claim
180 words
A light activated, high resolution field sustained conductivity image storage and display panel comprising: a. an optically transparent planar substrate; b. a bottom electrode constituting a transparent conductive coating on one side of said substrate; c. a phosphor layer capable of having its luminescence modulated in response to an electrical field established thereacross disposed over said bottom electrode; d. a light opaque layer disposed over said phosphor layer, said light opaque layer having a high resistance in directions parallEl to the surface of said planar substrate; e. a layer of cadmium sulfide disposed over said light opaque layer, said layer of cadmium sulfide being from 2 to 15 microns thick; f. an electrode member in the form of a composite layer of two materials which have diverse conducting properties disposed on said layer of cadmium sulfide; g. an upper electrode constituting a transparent conductive film disposed over said composite layer; h. a transparent cover disposed over said top electrode and hermetically sealed to said substrate; and i. means for applying a dc bias voltage across said bottom and upper electrodes.
References Cited (Backward Citations)
US3648052A
Cited
US3590253A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |