US4845405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic LED display
Assignee: Sanyo Electric Co Ltd
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Filing: 1987-05-08
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Granted: 1989-07-04
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Expires: 2007-05-08
Abstract
Abstract According to the present invention, and LED display comprises LED elements in a matrix arrangement of rows and columns on a substrate, only LED elements other than LED elements located in the outermost peripheral rows and columns being utilized to be driven by a driver.
Inventors
- 👤 Mikihito Yamane
- 👤 Hiroshi Yamane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:53
CPC Classifications
H; H10; H10W; H10W90/00; H10H; H10H29/00; H10H29/10; H10H29/14; H10H29/142; H10H20/00; H10H20/01; H10W72/00; H10W72/851; H10W72/874; H10W72/884; H10W90/701; H10W90/751; H10W90/753
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
An LED display of a monolithic type comprising: a substrate having striped conductive films separated parallel to each other on the upper surface thereof, a plurality of LED elements formed in a single semiconductor wafer, each element having two opposite conductivity semiconductor materials joined at a junction located at a fixed depth below the uppermost surface of the element, the lowermost surface of each of the elements mounted in a matrix arrangement of row and columns on said conductive films by electrically conductive adhesive, each of said LED elements being isolated by groove along columns (or rows) in the wafer which grooves are a least three times deeper than the junction depth to provide for an LED with enhanced visual characteristics, and grooves along rows (or columns) extending to the bottom of the wafer and being aligned with gaps between the striped conductive films, and conductive wires for connecting said LED elements for each column on the upper surface thereof.
Claim 2
Dependent Claim
160 words
An LED display of a monolithic type comprising: a substrate having striped conductive films separated parallel to each other on the upper surface thereof, a plurality of LED elements formed in a single semiconductor wafer, each element having two opposite conductivity semiconductor materials joined at a junction located at a fixed depth below the uppermost surface of the element, the lowermost surface of each of the elements mounted in a matrix arrangement of row and columns on said conductive films by electrically conductive adhesive, each of said LED elements being isolated by groove along columns (or rows) in the wafer which grooves are a least three times deeper than the junction depth to provide for an LED with enhanced visual characteristics, and grooves along rows (or columns) extending to the bottom of the wafer and being aligned with gaps between the striped conductive films, and conductive wires for connecting said LED elements for each column on the upper surface thereof.
Claim 3
Dependent Claim
43 words
An LED display of a monolithic type in accordance with claim 1, wherein said substrate comprises a compound semiconductor, and the striped conductive films are separated from each other simultaneously with formation of the grooves extending to the substrate along rows (or columns).
Claim 4
Dependent Claim
19 words
An LED display of a monolithic type in accordance with claim 1, wherein said substrate comprises a compound semiconductor.
Claim 5
Dependent Claim
25 words
An LED display of a monolithic type in accordance with claim 3, wherein said substrate and said LED elements comprise a compound semiconductor containing Ga.
Claim 6
Dependent Claim
48 words
An LED display of a monolithic type as set forth in claim 7 further comprising two driver means connected to said striped conductive films and said metal wires, said driver means being used for driving only elements other than elements located in the outermost peripheral rows and columns.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |