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US4853593A
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US
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Light emitting diode (LED) display
Assignee: Siemens AG
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Filing: 1987-09-08
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Granted: 1989-08-01
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Expires: 2007-09-08
Abstract
Abstract Light emitting diode (LED) display devices having several luminous segments are disposed inside a transparent front support plate and each of a plurality of light emission diodes is associated with one of the respective luminous segment via a light conducting segment. This display device requires little space, is easy and cost-effective to manufacture, and permits great design flexibility in order to make possible an expansion of its area of use. The invention provides to this end that the light conducting segment is formed in the region of the respective luminous segment as a quasi planar light guide structure for the distribution of the light emitted by the respective light emission diode in the region of the luminous segment. The light emitting diode display device in accordance with the invention is suitable as a LED display for numerals and/or symbols.
Inventors
- 👤 Karl-Ulrich Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:27
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/302; G09F9/3023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
189 words
An LED display device comprising: a transparent, front panel having an exterior side and an inner side; a plurality of luminous segments each having a predetermined luminous area and located on the inner side of the transparent, front panel; each luminous segment having a corresponding LED chip; each LED chip being connected to its corresponding segment via a light guide structure; the light guide structure in the region of the corresponding LED chip being a quasi planar structure and extending away from its corresponding LED chip for distribution of light emitted by the corresponding LED chip over the predetermined luminous area; a reflector layer disposed between the inner side of the front panel and the light guide structure and occupying at least most of the luminous area of each luminous segment, the reflector layer having apertures or openings in a raster pattern forming a grid between the openings, a diffusor layer occupying each of the openings in the reflector layer and disposed between the inner side of the front panel and its respective luminous segment; and a conductor tape forming a lead frame to which each LED is glued.
Claim 2
Dependent Claim
189 words
An LED display device comprising: a transparent, front panel having an exterior side and an inner side; a plurality of luminous segments each having a predetermined luminous area and located on the inner side of the transparent, front panel; each luminous segment having a corresponding LED chip; each LED chip being connected to its corresponding segment via a light guide structure; the light guide structure in the region of the corresponding LED chip being a quasi planar structure and extending away from its corresponding LED chip for distribution of light emitted by the corresponding LED chip over the predetermined luminous area; a reflector layer disposed between the inner side of the front panel and the light guide structure and occupying at least most of the luminous area of each luminous segment, the reflector layer having apertures or openings in a raster pattern forming a grid between the openings, a diffusor layer occupying each of the openings in the reflector layer and disposed between the inner side of the front panel and its respective luminous segment; and a conductor tape forming a lead frame to which each LED is glued.
Claim 3
Dependent Claim
24 words
A display device according to claim 1, wherein the the light guide structure includes a light conducting segment having the LED chip embedded therein.
Claim 4
Dependent Claim
35 words
A display device according to claim 1, wherein the light guide structure includes a light conducting segment having the LED chip embedded therein in a location laterally displaced to a side of the luminous segment.
Claim 5
Dependent Claim
24 words
A display device according to claim 1, wherein the light guide structure includes a light conducting segment which is coextensive with the luminous segment.
Claim 6
Dependent Claim
19 words
A display device according to claim 2, wherein the light conducting sgment is substantially coextensive with the luminous segment.
Claim 7
Dependent Claim
19 words
A display device according to claim 2, wherein the light conducting segment is completely coextensive with the luminous segment.
Claim 8
Dependent Claim
37 words
A display device according to claim 1, wherein the apertures or openings of the reflector layer occupy a greater portion of the luminous area along the length of the light conducting segment away from its LED chip.
Claim 9
Dependent Claim
29 words
A display device according to claim 1, wherein the reflector layer has a basic color corresponding to that of the display on the side away from the LED chip.
Claim 10
Dependent Claim
24 words
A display device according to claim 1, wherein the conductor tape and front panel are connected together by a diffusely reflecting synthetic material seal.
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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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |