Patent US4978208A successfully refreshed from Google Patents.
US4978208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectronic diode spatial light modulator and eye protection goggles incorporating the same
Assignee: Raytheon Co
•
Filing: 1989-07-24
•
Granted: 1990-12-18
•
Expires: 2009-07-24
Abstract
Abstract A spatial light modulator includes a photosensor diode and a photoemitting diode array, each having two semiconductive layers of opposite electrical polarities, and which are sandwiched together with layers of the same polarity (P or N) in electrical contact with each other. Transparent electrode layers are formed on the opposite surfaces of the photosensor diode and photoemitting diode array respectively, in electrical contact with the layers of the opposite polarity. The individual photoemitting diodes are electrically and optically isolated from each other. With a voltage applied across the electrodes which causes the photosensor diode to be reverse biased and the photoemitting diodes to be forward biased, the photoemitting diode array generates a visual display which is a reproduction of a light image incident on the photosensor diode. The photosensor diode may be replaced by a single layer of a photoconductive material. Two of the spatial light modulators may be combined in a frame with suitable optics to provide eye protection goggles.
Inventors
- 👤 Tsung-Yuan Hsu
- 👤 Shin-Tson Wu
- 👤 Robert Y. Loo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:22
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/022; A61F9/023; H; H10; H10F; H10F55/00; H10F55/10; H10F55/15; H10F55/155; H10F55/16; H10F55/165
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
59 words
A spatial light modulator comprising: a photoconductive member; a photoemitting diode array including a plurality of photoemitting diodes which are electrically and optically isolated from each other and electrically connected to respective sections of the photoconductive member; and first and second transparent electrodes which sandwich the photoconductive member and photoemitting diode array therebetween and are electrically connected thereto respectively.
Claim 2
Dependent Claim
59 words
A spatial light modulator comprising: a photoconductive member; a photoemitting diode array including a plurality of photoemitting diodes which are electrically and optically isolated from each other and electrically connected to respective sections of the photoconductive member; and first and second transparent electrodes which sandwich the photoconductive member and photoemitting diode array therebetween and are electrically connected thereto respectively.
Claim 3
Dependent Claim
17 words
A spatial light modulator as in claim 1, in which the photoemitting diodes comprise light emitting diodes.
Claim 4
Dependent Claim
16 words
A spatial light modulator as in claim 1, in which the photoemitting diodes comprise laser diodes.
Claim 5
Dependent Claim
37 words
A spatial light modulator as in claim 1, further comprising an electrically conductive adhesive for adhering the photoconductive member and photoemitting diode array together and electrically interconnecting the respective sections of the photoconductive member and photoemitting diodes.
Claim 6
Dependent Claim
36 words
A spatial light modulator as in claim 1, further comprising a substrate for supporting the photoconductive member and photoemitting diode array, at least one of the substrate, photoconductive member and photoemitting diode array being optically opaque.
Claim 7
Dependent Claim
24 words
A spatial light modulator as in claim 1, in which the photoemitting diode array and respective sections of the photoconductive member are two dimensional.
Claim 8
Dependent Claim
23 words
A spatial light modulator as in claim 1, further comprising barrier means for electrically and optically isolating the photoemitting diodes from each other.
Claim 9
Dependent Claim
25 words
A spatial light modulator as in claim 7, in which the barrier means comprises grooves formed in the photoemitting diode array between adjacent photoemitting diodes.
Claim 10
Dependent Claim
26 words
A spatial light modulator as in claim 7, in which the barrier means comprises insulative regions formed in the photoemitting diode array between adjacent photoemitting diodes.
Claim 11
Dependent Claim
29 words
A spatial light modulator as in claim 7, in which the barrier means comprises insulative regions formed by proton implantation in the photoemitting diode array between adjacent photoemitting diodes.
Claim 12
Dependent Claim
28 words
A spatial light modulator as in claim 1, further comprising a substrate, the photoconductive member and photoemitting diode array being constituted by semiconductive layers formed on the substrate.
Claim 13
Dependent Claim
21 words
A spatial light modulator as in claim 1, further comprising optical means for forming a light image on the photoconductive member.
Claim 14
Dependent Claim
22 words
A spatial light modulator as in claim 1, further comprising optical means for forming a light image of the photoemitting diode array.
Claim 15
Dependent Claim
32 words
A spatial light modulator as in claim 1, further comprising power source means for applying an electrical potential across the first and second electrodes such that the photoemitting diodes are forward biased.
Claim 16
Dependent Claim
82 words
A spatial light modulator as in claim 1, in which the photoconductive member comprises a photosensor diode, the photoemitting diodes being electrically connected to the respective sections of the photosensor diode such that regions of the respective sections of the photosensor diode and photoemitting diodes having a first electrical polarity are connected together; the first and second electrodes being electrically connected to regions of the photosensor diode and photoemitting diodes respectively having a second polarity which is opposite to the first polarity.
Claim 17
Dependent Claim
39 words
A spatial light modulator as in claim 15, further comprising power source means for applying an electrical potential across the first and second electrodes such that the photosensor diode is reverse biased and the photoemitting diodes are forward biased.
Claim 18
Dependent Claim
81 words
Eye protection goggles, including frame means, and at least one opaque eyepiece means supported by the frame means, each of said at least one eyepiece means comprising: a photoconductive member; a photoemitting diode array including a plurality of photoemitting diodes which are electrically and optically isolated from each other and electrically connected to respective sections of the photoconductive member; and first and second transparent electrodes which sandwich the photoconductive member and photoemitting diode array therebetween and are electrically connected thereto respectively.
Claim 19
Dependent Claim
81 words
Eye protection goggles, including frame means, and at least one opaque eyepiece means supported by the frame means, each of said at least one eyepiece means comprising: a photoconductive member; a photoemitting diode array including a plurality of photoemitting diodes which are electrically and optically isolated from each other and electrically connected to respective sections of the photoconductive member; and first and second transparent electrodes which sandwich the photoconductive member and photoemitting diode array therebetween and are electrically connected thereto respectively.
Claim 20
Dependent Claim
38 words
Eye protection goggles as in claim 17, further comprising power source means for applying an electrical potential across the first and second electrodes of said at least one eyepiece means such that the photoemitting diodes are forward biased.
Claim 21
Dependent Claim
28 words
Eye protection goggles as in claim 17, in which said at least one eyepiece means further comprises optical means for forming a light image on the photoconductive member.
Claim 22
Dependent Claim
29 words
Eye protection goggles as in claim 17, in which said at least one eyepiece means further comprises optical means for forming a light image of the photoemitting diode array.
Claim 23
Dependent Claim
29 words
Eye protection goggles as in claim 17, in which said at least one eyepiece means further comprises image intensification means for intensifying an image of the photoemitting diode array.
Claim 24
Dependent Claim
87 words
Eye protection goggles as in claim 17, in which photoconductive member of said at least one eyepiece means comprises a photosensor diode, the photoemitting diodes being electrically connected to the respective sections of the photosensor diode such that regions of the respective sections of the photosensor diode and photoemitting diodes having a first electrical polarity are connected together; the first and second electrodes being electrically connected to regions of the photosensor diode and photoemitting diodes respectively having a second polarity which is opposite to the first polarity.
Claim 25
Dependent Claim
45 words
Eye protection goggles as in claim 22, further comprising power source means for applying an electrical potential across the first and second electrodes of said at least one eyepiece means such that the photosensor diode is reverse biased and the photoemitting diodes are forward biased.
References Cited (Backward Citations)
US4848890A
Cited
US4914296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |