US4644342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Array of light emitting diodes for producing gray scale light images
Assignee: Eastman Kodak Co
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Filing: 1984-03-29
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Granted: 1987-02-17
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Expires: 2004-03-29
Abstract
Abstract An array of addressable, electrically isolated, light emitting diodes are fabricated in the substrate of a monolithic device. Discrete regions of the array constitute respective pixels of the array. Each array pixel has at least three diodes. Two diodes are commonly addressable and a third diode interleaved between the commonly addressable diodes is separately addressable. Each diode of an array pixel, when addressed is forward biased and produces output light which is emitted from its pixel and forms a light image on a corresponding pixel of an image zone. The selectively addressing of the LEDs of the array pixels causes the addressed LEDs to emit light and provide different gray scale light images at corresponding image zone pixels.
Inventors
- 👤 Daniel C. Abbas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:33
CPC Classifications
H; H10; H10H; H10H29/00; H10H29/10; H10H29/14; G; G06; G06T; G06T3/00; G06T3/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A monolithic device for producing gray scale light images at pixels of an image zone, comprising: an array of selectively addressable LEDs arranged so that discrete regions of the array constitute respective pixels of the array, each array pixel having first and second LEDs addressed by a single common lead, and a third separately addressable LED interleaved between said first and second LEDs, each such array pixel LED when addressed being responsive to a forward bias voltage to emit light which forms a light image at a corresponding pixel of the image zone, whereby the selective addressing of the LEDs of the array pixels causes the addressed LEDS to emit light and produce desired gray scale light images at corresponding image zone pixels.
Claim 2
Dependent Claim
123 words
A monolithic device for producing gray scale light images at pixels of an image zone, comprising: an array of selectively addressable LEDs arranged so that discrete regions of the array constitute respective pixels of the array, each array pixel having first and second LEDs addressed by a single common lead, and a third separately addressable LED interleaved between said first and second LEDs, each such array pixel LED when addressed being responsive to a forward bias voltage to emit light which forms a light image at a corresponding pixel of the image zone, whereby the selective addressing of the LEDs of the array pixels causes the addressed LEDS to emit light and produce desired gray scale light images at corresponding image zone pixels.
Claim 3
Dependent Claim
19 words
The monolithic device of claim 1 wherein the array of LEDs comprise an extrinsic material diffused into a substrate.
Claim 4
Dependent Claim
84 words
The invention as set forth in claim 2 further comprising: first and second voltage sources for each array pixel, each of said first voltage sources being adapted to be connected to its corresponding array pixel's first and second LEDs, each of said second voltage sources being adapted to be connected to its corresponding array pixel's third LED; and means for addressing the LEDs of an array pixel by selectively connecting them to their corresponding voltage sources to cause the addressed LEDs to emit light.
Claim 5
Dependent Claim
22 words
The invention as set forth in claim 3, wherein the monolithic device includes a common cathode electrode connected to all array LEDs.
Claim 6
Dependent Claim
35 words
The invention as set forth in claim 4, wherein the first and third pixel LEDs produce light images at the image zone which cause different exposures of a photosensitive medium disposed at such image zone.
Claim 7
Dependent Claim
25 words
The invention as set forth in claim 5, wherein the voltages provided by said first and second voltage sources for each array pixel are adjustable.
Claim 8
Dependent Claim
15 words
The invention as set forth in claim 4, wherein said addressing means includes a microprocessor.
References Cited (Backward Citations)
US3438057A
Cited
US3595991A
Cited
US3647958A
Cited
US3886403A
Cited
US3786307A
Cited
US3845243A
Cited
US3975085A
Cited
US3947840A
Cited
US4107242A
Cited
US4298869A
Cited
US4342031A
Cited
US4513281A
Cited
US4531160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |