US4241343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display apparatus
Assignee: International Business Machines Corp
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Filing: 1978-08-18
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Granted: 1980-12-23
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Expires: 1998-08-18
Abstract
Abstract A display apparatus may be constructed by imparting motion to the light from a small light source to give the appearance of a line, causing the light to be "off" and "on" as desired during traverse of a line length, using as many light sources as needed for a two-dimensional display and precorrecting the light timing to compensate for the apparent change in movement rate during the motion.
Inventors
- 👤 George J. Fan
- 👤 Richard L. Garwin
- 👤 James L. Levine
- 👤 Janusz S. Wilczynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:10
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
In visual apparatus of the type wherein a two-dimensional display is produced through giving the appearance of cyclical motion to the virtual image of the light from each member of a row of lights by passing the light through a rotating prism and selectively turning each light "on" and "off" during portions of said motion in accordance with a pattern to be displayed; the distortion compensating improvement comprising: means for precorrecting light signal "on" and "off" timing apparatus synchronized with rotation of said prism said precorrecting apparatus including sensible means angularly spaced with respect to said virtual image travel during passage of a facet of said prism to accommodate for the apparent change inmovement rate of said virtual image to the eye of the observer as said image traverses portions of said cyclical motion.
Claim 2
Dependent Claim
134 words
In visual apparatus of the type wherein a two-dimensional display is produced through giving the appearance of cyclical motion to the virtual image of the light from each member of a row of lights by passing the light through a rotating prism and selectively turning each light "on" and "off" during portions of said motion in accordance with a pattern to be displayed; the distortion compensating improvement comprising: means for precorrecting light signal "on" and "off" timing apparatus synchronized with rotation of said prism said precorrecting apparatus including sensible means angularly spaced with respect to said virtual image travel during passage of a facet of said prism to accommodate for the apparent change inmovement rate of said virtual image to the eye of the observer as said image traverses portions of said cyclical motion.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein said synchronization of said light signal apparatus means is mounted on the shaft of rotation of said prism.
Claim 4
Dependent Claim
14 words
The apparatus of claim 2 wherein said precorrecting signal means is optically sensible marks.
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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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |