US5266531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic holographic display with cantilever
Assignee: PDACO Ltd
•
Filing: 1992-04-28
•
Granted: 1993-11-30
•
Expires: 2012-04-28
Abstract
Abstract A dynamic holographic display has an array of reflective surfaces formed on cantilever structures substantially parallel to the surface of a substrate, such as a silicon wafer. A holographic image is formed by controlling electrical currents passed through the cantilever structures to position the reflective surfaces of the cells in the array so the topography forms a hologram, and reflected light interferes to form a holographic image. In a preferred embodiment, control is by computer and positions of reflective surfaces are determined by calculation from dimensional data available to the control computer.
Inventors
- 👤 Dan Kikinis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:36
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/22; G03H1/2294; G03H2225/00; G03H2225/20; G03H2225/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
A method of forming a movable reflective surface on a substrate for making a dynamic holographic display device comprising the steps of: etching and undercutting a U-shaped trench in a surface of said substrate such that a cantilever structure is formed that extends in a direction substantially parallel to said substrate surface; forming a reflective coating to at least a portion of said cantilever structure to form said movable reflective surface; and providing electrical contacts to said substrate and to said cantilever structure so that passing an electrical current through said cantilever structure heats said cantilever structure, as a result deforming said cantilever structure to thereby move said movable reflective surface.
Claim 2
Independent Claim
111 words
A method of forming a movable reflective surface on a substrate for making a dynamic holographic display device comprising the steps of: etching and undercutting a U-shaped trench in a surface of said substrate such that a cantilever structure is formed that extends in a direction substantially parallel to said substrate surface; forming a reflective coating to at least a portion of said cantilever structure to form said movable reflective surface; and providing electrical contacts to said substrate and to said cantilever structure so that passing an electrical current through said cantilever structure heats said cantilever structure, as a result deforming said cantilever structure to thereby move said movable reflective surface.
Claim 3
Dependent Claim
14 words
A method as in claim 1 wherein said substrate comprises a doped semiconductor substrate.
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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |